FOR APPROVAL
E

Feb. 13, ‘13

Issue for Approval

J.A.SEO

M.K.LEE

J.Y.KIM

D

Nov. 26, ‘13

Issue for Approval

J.A.SEO

E.S.LEE

J.Y.KIM

C

Oct. 20, ‘13

Issue for Approval

J.A.SEO

E.S.LEE

J.Y.KIM

B

Aug. 6, ‘13

Issue for Approval

J.A.SEO

J.K.SEO

J.Y.KIM

A

Mar. 31, ‘13

Issue for Approval

M.K.LEE

J.K.SEO

J.Y.KIM


REV.

DATE

DESCRIPTION

DSGN

CHKD

APPD

PROJECT :

TWO(2) x 500 MW MONG DUONG 1 THERMAL POWER PLANT
EMPLOYER :

CONSULTANT :

CONTRACTOR :

DESIGNED BY

DATE

TITLE :

M.K.LEE

Feb. 10, ‘12


CHECKED BY

DATE

J.K.SEO

Feb. 10, ‘12

APPROVED BY

DATE

PROJECT NUMBER

DOCUMENT NUMBER

REV.

J.Y.KIM

Feb. 10, ‘12

ADB/MD1-TPIP/EPC150911

MD1-0-M-100-03-00001

E

PLANT OVERALL DESCRIPTION



TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

Content
1.0

INTRODUCTION ............................................................................................. 1
1.1 GENERAL ............................................................................................................ 1
1.2 PROJECT DESCRIPTION ................................................................................... 1
1.3 DESIGN CONDITION AND CODE ....................................................................... 2
1.4 PLANT OVERALL SYSTEM CONFIGURATION .................................................. 2
1.5 MAJOR SYSTEM DESIGN CONSIDERATION.................................................. 19

2.0

PLANT CONTROL PHILOSOPHY ................................................................ 25
2.1 GENERAL .......................................................................................................... 25
2.2 BALANCING CONTROL .................................................................................... 25
2.3 PLANT CONTROL MODE .................................................................................. 25
2.4 CONTROL FUNCTION OF MAJOR EQUIPMENT............................................. 26

3.0

PLANT OPERATION PHILOSOPHY ............................................................ 27
3.1 BASIC CONCEPT OF OVERALL PLANT OPERATION .................................... 27
3.2 PLANT OPERATION MODE .............................................................................. 27


4.0

PLANT START-UP AND SHUT-DOWN PROCEDURE ................................. 32
4.1 PLANT START-UP ............................................................................................. 32
4.2 PLANT SHUT-DOWN ......................................................................................... 42
4.3 DEGREE OF AUTOMATION FOR PLANT START-UP AND SHUTDOWN ........ 43

5.0

ABBREVIATION ............................................................................................ 52

6.0

ATTACHMENTS ............................................................................................ 54

7.0

REFERENCES .............................................................................................. 54

i


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

1.0

INTRODUCTION


1.1

General

Rev.E

This description introduces and provides a general understanding of system configuration,
feature and control scheme of the Mong Duong 1 Thermal Power Plant, which will have a
nominal gross output of 540MW per each unit and have two Units, in Cam Pha town, Quang
Ninh province, Vietnam.
This document has been updated with the Contractor’s review and improvement of actual
engineering and design. However, the document may be improved to reflect the actual
engineering and design as required.

1.2

Project Description
Mong Duong Thermal Power Plant is located adjacent to the national highway N0.I8A, which
is about 50km from Ha Long city in the northeast and about 18km from Cam Pha town. This
location belongs to zone No. 3, Mong Duong ward, Cam Pha town, Quang Ninh province.
Mong Duong Thermal Power Plant, with an area of about 107 hectares, includes Mong Duong
1 comprising 2 X 540 MW coal-fired CFB steam units and Mong Duong 2 comprising 2 X 600
MW PC steam units respectively.
The plant and facilities provided will comply with the local rules and regulations and the
Technical Requirements specified in this document. The power island will consist of four (4)
Circulating Fluidized Bed (CFB) boilers supplying steam to two (2) steam turbine generators.
Electric power will be fed to the National Grid at voltage of 500 kV to Quang Ninh 500/220 kV
substation. The 110 kV transmission line will supply power for the start-up and commissioning,
and serve as the standby power source during normal operation.
The power plan cooling water (once through cycle) will be extracted from Gac Canal

(seawater) whilst fresh water is piped to the site from the Thac Thay River located at about 12
km from the site. The fresh water supply system will be undertaken by the Owner.
Coal supplied to the power plant is dust coal mixtures of 5HG dust coal, 6HG dust coal, dust
coal and slurry coal from coal mines in Mong Duong - Cam Pha area. Coal will be supplied
to the terminal point in the receiving tower located at the south side of the plant.
Heavy Fuel oil Type 2B TCVN 6239-2002 will be used as secondary fuel for boiler start-up
and operation at low load. Fuel oil is transported to the power plant by specialized barges to
the fuel oil unloading jetty.
Limestone used for the CFB boiler is taken from limestone mines in Hoanh Bo area, Quang
Ninh Province, by trucks to Troi port. From the port limestone is transported to the power plant
by barges to the berth adjacent to the fuel oil unloading berth.

1


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

Fly ash and bottom ash will be disposed of at the ash pond located about 1 km from the
power plant.
1.3

Design Condition and Code

1.3.1

Site Condition
For overall power plant design, please refer to Attachment 8, “Site Ambient Condition”.

For consistency of performance comparison between different operating configuration, all
performance figures are estimated at reference site condition as below:

1.3.2

▪

Ambient Temperature

34.5 ℃

▪

Relative Humidity

85 %

▪

Barometric Pressure

1,010 mbar

▪

Sea Water Temperature

26.5 ℃

▪


Power Factor

0.85 lagging

▪

Boiler Fuel

Performance Coal (Anthracite)

Fuel and Ash Specification
Please refer to Attachment 9, “Fuel and Ash Specification”.

1.3.3

Water Qualities
Please refer to Attachment 10, “Water Qualities”.

1.3.4

Codes and Standards
Please refer to Attachment 11, “Code and Standards”.

1.4

Plant Overall System Configuration
Mong Duong 1 Thermal Power Plant is composed of two(2) Units. And One(1) Unit includes
Two(2) CFBC boilers and One(1) STG. Therefore, configuration of all the main equipment can
be classified into three categories, Plant common, Unit common and Boiler basis.

Unit common basis means that configuration and function of subsystem or equipment is
organized for Each Unit. Boiler basis means that configuration and function of subsystem or

2


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

equipment is organized for Each Boiler. Plant common basis means that configuration and
function of subsystem or equipment is organized for overall plant.
For detail system configuration, please refer to Attachment 12, “Redundancy List”.
Design information for major equipment are as follows:
Equipment

Design Parameter

Value

Remark

Overall

Plant Gross Output

540 MW X 2

Under RO

Load

Emission Limit

NOx : 560 mg/Nm3
SO2 : 280 mg/Nm3
Dust : 112 mg/Nm3

Boiler

PA fan

SA fan

ID fan

Coal Handling
System

Limestone

Firing Type

Circulating Fluidized Bed
Combustion Type

Steam Generation Type

Natural Recirculation Type


Drum Retention Time

12 sec

Under
BMCR Load

Steam Output

916.26 ton/hr

Under
BMCR Load

Head

2,141 mmH2O

Flow Rate

367,404 kg/hr

Under
Rated
Condition

Head

1,165 mmH2O


Flow Rate

249,233 kg/hr

Head

800 mmH2O

Flow Rate

769,629 kg/hr

Conveying Capacity

1,000 ton/hr

Crushing Capacity

1,000 ton/hr

Storage Capacity

158,800 ton

Conveying Capacity

250 ton/hr

3


Under
Rated
Condition
Under
Rated
Condition


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION
Equipment

Design Parameter

Value

Handling
System

Storage Capacity

12,400 ton

Ash Handling
System

Conveying Capacity

Fly Ash : 250.4 ton/hr
Bottom Ash :250.4 ton/hr


Transfer Capacity

Fly Ash : 155.2 ton/hr

Rev.E
Remark

Under the
worst coal
firing
condition

Bottom Ash :345.6 ton/hr
Disposal Capacity

500.8 ton/hr

Fly Ash Storage

9,600 m3

Bottom Ash Storage

7,400 m3

Steam Turbine

Type


triple pressure, reheat,
regeneration, three casing,
tandem compound, four(4)
flow and down exhaust type

Generator

Generator Terminal Output,
MW

540

Generator rated voltage, kV

21

Generator cooling method,
stator / rotor

Water/Hydrogen

Condenser

Exciter Type and Gen. full
load field current

PSCR (Potential-source
controlled rectifier system),
4183A


Design Vacuum

0.0711 bara

Cooling Water Temperature

26.5 ℃

Temperature Rise

8.0 ℃

Condensate
Extraction
Pump

Head

280 m

Flow Rate

810 m3/hr

Deaerator &

Type

Horizontal, Spray & Tray


4

Under RO
load

Under RO
load

Under
Rated
Condition


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION
Equipment

Design Parameter

Value

Remark

Feedwater Tank

Storage Capacity

173 m3

At N.W.L


Retention Time

5 min.

N.W.L to
L.L.W.L
Under VWO

Head

2,400 m

Flow Rate

1,250 m3/hr

Under
Rated
Condition

Rated Power, MVA

660(220 x 3sets)

Boiler
Feedwater
Pump

Generator

Transformer

Station
Transformer

Unit Aux.
Transformer

Rated Voltage,
21 / 525
Primary / Secondary
Cooling Method

ODAF

Rated Power, MVA

75/100

Rated Voltage,
115/ X:10.5/ Y:10.5
Primary / Secondary
Cooling Method

ONAN/ONAF

Rated Power, MVA

75/100


Rated Voltage,
21/ X:10.5/ Y:10.5
Primary / Secondary
Cooling Method

1.4.1

Rev.E

ONAN/ONAF

Main Equipment or System as Unit Common Basis
1)

One(1) X 100% of Steam Turbine and Generator with its auxiliaries
Steam turbine is of triple pressure, reheat, three casing, tandem compound and down
exhaust type and has 540 MW nominal gross output capacity. Generator is of
hydrogen/water cooled type. Auxiliary systems such as lube oil system, hydraulic oil
system, seal oil supply system, generator cooling system and so on will be provided for
STG.

5


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

For detail, please refer to “System Description of Steam Turbine & Generator (Doc.No. :

MD1-0-V-111-03-00001)
2)

Main & Reheat Steam System
This system is composed of main steam and reheat steam piping to connect between
boiler and steam turbine with its auxiliaries. For detail, please refer to “System
Description –Main & Reheat Steam System (Doc.No. : MD1-0-M-110-03-00001)

3)

Feedwater Heating System
This system is composed of Seven(7) stage feedwater heaters (13LCC11/12/20/30/40
AC001, 13LAD10/20/30AC001), one(1) X 100% of deaerator and feedwater tank (13LAA
10AC/BB001), extraction piping, cascade drain piping and vent piping with their
auxiliaries. For detail, please refer to “System Description –Feedwater Heating System
(Doc.No. : MD1-0-M-110-03-00003)

4)

Condensate System
This system is composed of two(2) X 50% of condensers (13MAG11/12AC001), two(2)
set of condenser flash tanks (13LCC01/02BB001), three(3) X 50% of condensate
extraction pumps (13LCB11/12/13AP001), one(1) X 100% of gland steam condenser (13
MAW10AC001) and piping to connect from condenser hot well to deaerator with its
auxiliaries. For detail, please refer to “System Description – Condensate System
(Doc.No. : MD1-0-M-120-03-00001)

5)

Feedwater System

This system is composed of three(3) X 50% of boiler feedwater booster pump (13LAC11/
12/13AP001) and boiler feedwater pumps (13LAC21/22/13AP001) with fluid coupling
device (13LAC21/22/23AP001MG01) and its piping to connected between feedwater
tank and boiler economizer (11HAC10AC301) with its auxiliaries including feedwater
control valves (11LAB33AA101). For detail, please refer to “System Description –
Feedwater System (Doc.No. : MD1-0-M-120-03-00002)

6)

Auxiliary Steam System
This system is composed of three(3) stage cascade auxiliary steam supply system. The
first stage system will receive source steam from auxiliary boiler (00UHB04AC004KC01)
and main steam line and provide conditioned steam to next stage system and air
preheater soot blower (00HCB05/06AT001/002KT01). The second stage system will
receive steam cold reheat steam line as well as the first stage and provide conditioned
steam to the third stage system and many superheated steam users. The third stage
system will provide to heating steam users.
For detail, please refer to “System Description – Auxiliary Steam System (Doc.No. :
MD1-0-M-110-03-00005)

6


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION
7)

Rev.E

Circulating Water System

This system is composed of two(2) X 50% circulating water pumps (13PAC11/12AP001)
and its piping, which is routed from intake channel with one(1) set of stop log (13PAA11/
12AB001), coarse bar screen (13PAA11/12AT001), fine bar screen (13PAA11/12AT002)
and travelling bend screen (13PAA11/12AT003) to seal pit via debris filter (13PAH10/20/
30/40AT001), tube cleaning system and condenser.
For detail, please refer to “System Description – Circulating Water System (Doc.No. :
MD1-0-M-130-03-00001)

8)

Closed Cooling Water System
This system is composed of one(1) set of closed cooling water tank (13PGF10CL
501), two(2) X 100% of closed cooling water pumps (13PSC11/12AP001) and closed
cooling water coolers (13PGD10/20AC001), various equipment coolers and its piping
to connect them as closed loop. This closed cooling water cooler will be cooled by
sea water that two(2) X 100% of auxiliary cooling water pumps (13PCC10/20AP001)
and auto filters (13PCH10/20AT001) provide from branch point of circulating water
piping.
For detail, please refer to “System Description – Closed Cooling Water System
(Doc.No. : MD1-0-M-140-03-00001)

9)

Electrical power and auxiliaries and unit transformer (main step-up and unit aux.
transformer)

10) Power Transformers
The following transformers and accessories will be provided for power plant as
shown in Key Single Line Diagram (Dwg. No. MD1-0-E-500-31-00002).
• Generator Transformers

• Unit Auxiliary Transformers
• Station Transformers
• 10 kV/LV Auxiliary Transformers
The oil-filled transformers will be located outdoors and separated by fire-rated walls
from adjacent structures and from each other. The plant design and determination of
the type of physical separation will be based on the requirements as stated in NFPA
850.
11) Switchgears

7


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

For the power supply of the steam turbine generator units and plant common
auxiliaries, switchgears and MCC’s will be provided as required for the power plant
as shown in Key Single Line Diagram (Dwg. No. MD1-0-E-500-31-00002).
▪

Medium Voltage Switchgears

The 10kV MV switchgears will be of the type tested, metal clad, drawout type and
rated for the maximum expected short circuit current based on short circuit
calculation and continuous current capacity. MV motors and LV switchgears will be
fed from MV switchgears.
The switchgears will be provided with automatic high speed busbar transfer scheme
and will be located indoor. The degree of protection will be IP 41.

Circuit breakers will be drawout type, electrically stored energy operated vacuum
circuit breakers.
Breakers will be provided with local control in addition to the remote control in the
control room. The control voltage will be 220V DC. Access space will be provided in
back and in front of the switchgear.
▪

Low Voltage Switchgears

The 400V LV switchgears will be of type tested, metal enclosed, draw out, fully
compartmentalized metal enclosed type using air break technology and rated for the
maximum expected short circuit currents based on short circuit calculation and
continuous current capacity. The construction of the LV switchgears will be such
that the internal separation by barriers complies with form 4b separation in
accordance with the requirements of IEC 60439-1.
The design will give the degree of protection equal or better than IP 41.
Circuit breakers will be electrically operated draw out air circuit breakers with solid
state trips for selective protection against overload, phase and ground faults. Control
voltage will be 220V DC.
▪

Motor Control Centers

The motor control centers will be designed metal enclosed type, dual or one face
type, withdrawable and modular type, consisting of enclosed sections with main bus,
insulated vertical bus, compartments and wireways.
400V motors, distribution panels, etc. will be fed from the motor control centers.
Starter circuits for motor feeder will be full voltage starting combination type,
consisting of molded case circuit breakers, magnetic contactors, thermal overload


8


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

relays, auxiliary relays, etc. Starter sizes will be based on motor capacity, full load
current, and type of service.
12) DC & UPS System
Each 220V DC system consists of two battery charger, one lead acid batteries and
one DC distribution board. 220V batteries are of valve regulated lead-acid (VRLA)
and rated for a minimum period of 30 minutes in the event of a total loss of AC
supplies. The battery chargers are solid state using silicon rectifiers with full wave,
fully controlled bridge configuration and complete with automatic voltage regulator,
current limiting circuitry, surge suppression network, smoothing filter circuits and softstart feature.
The chargers will be suitable for float charging as well as boost charging the battery.
Each battery charger will be capable of float charging batteries while supplying the
station normal DC load. Each rectifier-charger unit shall be designed for a capacity to
supply 100% of the consumers (inclusive the inverter for the UPS system) connected
to the complete main DC switchgear and to charge one battery at the same time.
Each 230V UPS system consist of inverters, bypass line transformers, voltage
stabilizer, static switch, manual bypass switch, distribution boards, necessary
protective devices and accessories. Each inverter will be fed from upstream 220V
DC distribution board.
The configuration of DC and UPS system are shown in Key Single Line Diagram
(Dwg. No. MD1-0-E-500-31-00002).
13) I&C System for automation and operation.
I&C system will consist of DCS for process control, package control system, steam

and water analyzing system(SWAS) for water and steam quality monitoring and
control, continuous emission monitoring system(CEMS), Vibration monitoring system
for major equipment protection and vibration monitoring and field instrumentation.
DCS will be provided for boiler & BOP control and monitoring and interface with
Package control system. DCS will be consisted of redundant power supplies, control
processors, memory devices, data communication facilities, operator stations,
engineering workstations, historian and printers. Four(4) remote monitoring stations
will be provided in administration building.
Burner management system(BMS) is included in DCS and provided as separate
controller which is same type and manufacturer as DCS. It will be provided for startup, shutdown and normal operation of the fuel firing equipment and to prevent errors

9


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

in operation and to protect against malfunctions of fuel firing equipment or associated
air systems for the most common emergency situations.
The On line performance monitoring system(OPM) will be integrated into the DCS
and provided to calculate the performance of the power plant.
Vibration monitoring system will be provided as an independent item to perform
machinery condition monitoring function and a computerized analysis system and
located in Computer Room for each unit.For interface with Load dispatch center,
redundant data links will be provided to link the RTU located in switchyard control
building. And the RTU will be interface with the DCS for remote control and
monitoring from LDC.
DCS & Type of control system and its detail drawing no for all the subsystem in Plant

are described in the following table.
System

Type of Control

Reference Drawing No.

System
Steam Turbine Generator

GE Mark-VIe

MD1-0-V-111-36-00715

Boiler

DCS

MD1-0-J-600-36-00001

Burner Management System

DCS

MD1-0-J-600-36-00001

DCS

MD1-0-J-600-36-00001


Soot Blower

PLC

MD1-0-V-161-10-12490

Coal Handling System

PLC

MD1-0-V-171-51-02111

BOP system
- Main and reheat steam system
- Turbine bypass system
- Feedwater system
- Condensate system
- Auxiliary steam system
- Closed cooling water system
- Circulating water system
- Service water / Demin water
Distribution system
- Fuel oil storage and supply
system
- Instrument and service air
distribution system

10



TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

Ash Handling System

PLC

MD1-0-V-173-51-02001

Limestone Handling System

PLC

MD1-0-V-172-51-02108

Electrostatic Precipitator

PLC

MD1-0-V-162-36-00001

Water Treatment Plant

PLC

MD1-0-V-805-36-00002

Waste Water Treatment Plant


PLC

MD1-0-V-805-36-00002

Condenser Tube Cleaning

PLC

MD1-0-V-134-09-00051

Debris Filter System

PLC

MD1-0-V-135-09-00043

Sea Water Intake Facility

PLC

MD1-0-V-132-08-00047

Compressed Air System

Manufacturer's

MD1-0-V-151-02-00017

System


own
microprocessor
Steam Bypass System

PLC

MD1-0-V-112-35-00005

Chemical Dosing System

PLC

MD1-0-V-850-36-00001

Auxiliary Boiler

PLC

MD1-0-V-181-36-00001

Hydrogen Generation Plant

PLC

MD1-0-V-152-05-00013

Gaseous Chlorination System

PLC


MD1-0-V-860-02-00004

Emergency Diesel Generator

PLC

MD1-0-V-182-32-30024

Fire Detection and Alarm

Manufacturer's

MD1-0-E-750-01-00101

System

own
microprocessor

HVAC System

Manufacturer's

MD1-0-H-203-35-00901

own
microprocessor
Switchyards Control System


SICAM PAS

MD1-0-V-570-02-00004

SCADA

via Modbus RTU

MD1-0-V-570-36-00001

For detail, please refer to “Design criteria for control and instrumentation (Doc.No. :
MD1-0-J-600-04-00001)

11


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

14) Fire fighting and alarm system.
▪

Fire Water Storage System
Two(2) fire water storage tanks complete with foundations, fittings, valves,
connections and instrumentation shall be provided. The fire water storage tank shall
be sized to provide three(3) hours continuous fire water supply in 5,500m3/tank
(1,750m3 water demand calculated) per each in accordance with TCVN 2622.


▪

Fire Pumps
Fire water pumps, installed inside the fire protection pump house adjacent to the
outdoor fire water storage tanks, shall take a suction from the fire water storage
tanks and shall feed fire water to the fire water distribution system. One(1) x 2,500
gpm (568m3/hr), 95m duty electric motor driven fire pump and one(1) One(1) x
2,500 gpm (568m3/hr), 95m standby diesel engine driven fire pump shall be
provided. Two(2) x 100 gpm(22.7m3/hr) 95m electric motor driven jockey pumps
with associated piping and instrumentation controls, shall also be provided to
maintain the fire main system pressure. All fire pumps shall be UL/FM approved and
designed in accordance with NFPA 20 and applicable local fire codes.

▪

Fire Water Distribution System
The fire water distribution systems are looped around the whole plant area. The fire
water loop inside the steam turbine building, boiler structure, administration building,
control building, switchgear control building and hydrogen plant shall be provided
with two (2) valve connections to the outdoor fire water ring main and with
appropriate sectional manual control valves on the interior loop.
Outdoor hydrants shall be installed in the plant for additional protection of yard
facilities buildings and structures. The hydrants shall be located along the fire
engine access road such that every part of the access road and / or access way is
within an unobstructed distance of 50m from any hydrant. The hydrants shall be
located that they are at least 10 m away from potential fire areas and hydrant
spacing shall be not more than 60 m spacing for the power block (turbine and boiler)
area, fuel oil storage tank area and coal dry storage shed, and 90m to 150m
spacing for the other areas.


▪

Indoor Hydrant system & Hose reel system
Each building except in the far distance area shall be provided with indoor hydrants
but small building less than 500m2 in floor area to be protected by hose reel. This
systems shall be designed in accordance with NFPA 14, TCVN 2622 and TCVN
4513.

▪

Automatic Sprinkler System
The automatic sprinkler system is provided for turbine generator bearing, cable
room in control building, diesel generator house, hydrogen plant room, fire
protection pump house, I&C electrical & mechanical warehouse and administration
building.
This system shall be designed in accordance with NFPA 13 and TCVN 7336.

▪

Automatic Water Spray System

12


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

The automatic water spray system is provided for turbine oil tank, control oil unit,

sealing oil unit, turbine oil cooler, air heater, burner front end, rear end, Aux. boiler,
transformers, steam turbine dirty oil tank and H2/O2 cylinder in hydrogen plant
building. The automatic water cooling spray system is provided for fuel oil storage
tanks and diesel oil storage tank.
The automatic water spray system shall be designed in accordance with NFPA 15
and TCVN 5307.
▪

Foam System
The fixed foam discharge system with Type II foam pourer is provided for fuel oil
storage tanks and diesel oil storage tank. The foam water sprinkler system is
provided for fuel oil pump house and the fixed foam unit is provided for fuel oil
unloading jetty and fuel oil unloading pump house.
The automatic water spray system shall be designed in accordance with NFPA 11,
NFPA 16 and TCVN 5307.

▪

Clean Agent (FM-200) Fire Extinguishing System
The clean agent fire extinguishing system is provided for main control room and
electronic equipment room in control building, control & protection room in
switchyard control house, control & equipment room in coal handling control
building, control room in hydrogen plant building, ESP control room in ESP control
house.
Clean agent fire extinguishing systems for protection by total flooding shall FM-200
system in compliance with the requirements of NFPA 2001. The system released
into the protected space will allow a person to breathe in the reduced oxygen
atmosphere. The design concentration shall be 7% for under floor, room and ceiling
space.


▪

Portable and Wheeled Fire Extinguishers
The following shall be provided within the buildings of the plant and at all locations
required by the relevant local rules and regulations:
4.0 ~ 8.0 kg portable dry-chemical fire extinguisher
5.0 kg portable CO2 fire extinguisher
Mobile fire extinguishers with 50 kg dry powder shall be provided and located in
the turbine generator halls and the diesel generator house.
Mobile fire extinguishers with 24 kg CO2 shall be provided and located in the
turbine generator halls and the control/switchgear building.
Portable fire extinguishers shall be provided in accordance with TCVN 3890 and
7435-1.

For control of firefighting system, please refer to “Description for Fire Fighting System
& Fire Alarm System (Doc. No.: MD1-0-F-750-03-00001)” and “Equipment Data
sheet – Main Fire Alarm Control Panel (Doc. No.: MD1-0-V-750-09-00037)”.
15) Heating, Ventilation and Air Conditioning System.
For detail HVAC system description (including HVAC control), please refer to “Design
Criteria for HVAC system (Doc. No.: MD1-0-H-710-04-00101)”.

13


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

16) Public Address System

For detail, please refer to “Communication Layout – Riser Diagram Public Address
System (Doc. No.: MD1-0-E-545-01-00301)”.
1.4.2

Main Equipment or System as Boiler Dependent Basis
The following Equipment or system will be provided as Boiler dependent basis :
1)

One complete circulating fluidized bed boiler
This equipment is composed of steam generation system, combustion system, coal
feed system, bottom ash removal system, start-up burner system, sootblower system
and its ancillary system.
The major equipment of each system as mentioned in the above is as follows:
▪

Steam Generation System

:

Economizer, Steam Drum (11HAD10BB
501), HRA, superheaters (11HAH10/20/
30AC301), reheaters (11HAJ10/20AC
301), and its interconnection pipings

▪

Combustion System

:


Furnace, Three(3) X 33% of cyclones,
Two(2) X 50% of Primary Air Fans (11
HAB11//12AN101) and Secondary Air
Fans (11HAB21/22AN101), Loop seal
blowers (11HDW01/02/03AN101), Air
preheater, Steam coil air heater
(11HLC10AC101)

▪

Coal Feeding System

:

Five(5) coal silos (11HFA01/02/03/04/05
BB101) and its coal feeders (11HFB10~
80AF001)

▪

Bottom Ash Removal System

:

Four(4) X 33% of Stripper coolers (11
HDA10~40AT101), Striper Cooler
Blowers (11HDA10~40AN101) and
Bottom Ash Rotary Valves
(11HDA10~40AF101)


▪

Sootblower System

:

Full Retractable type and Half
Retractable type soot blowers

For detail, please refer to “Steam Generation System Description (Doc.No. : MD1-0V-161-03-00001)”.
2)

Flue Gas System

14


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

This system is composed of electrostatic precipitator (11HDE10AT001),
Two(2)X50% of induced draft fan (11HNC15AN001/002), stack (14UTJ) and its
interconnection duct. Stack has two flues and each flue is connected to one boiler
flue gas duct.
For detail of electrostatic precipitator, please refer to “Overall Description with ESP
Control (Doc. No. : MD1-0-V-162-03-00004)”.
For detail of induced draft fan, please refer to “System Description – Induced draft
fan (Doc. No. : MD1-0-V-163-03-00001)”. (To be submitted later)

3)

Bottom Ash Handling System
This system is composed of two(2) sets of mechanical conveyors and one(1) bottom
ash silo (04EUH10/20BB001).
For detail, please refer to “Design Basis Report & System Description – Ash
Handling System (Doc. No. : MD1-0-V-173-03-00281)”.

4)

Fly Ash Handling System
This system is composed of two(2) buffer tanks, three(3) X 50% of pneumatic
vacuum blowers (04EUK10/20AN001~003), and three(3) X 50% of pneumatic
blowers and their interconnection piping. Fly ash silo (04EUH30BB001) will be
provided for fly ash from two boilers.
For detail, please refer to “Design Basis Report & System Description – Ash
Handling System (Doc. No. : MD1-0-V-173-03-00281)”.

5)

Turbine Bypass System
This system is composed of one(1) set of HP bypass valve (11/12MAN10AA101)
with desuperheating station, one(1) set of LP bypass valve (11/12MAP10AA081) with
desuperheating station, one(1) dump tube and its interconnection piping with its
auxiliaries. Hydraulic power supply unit will be provided to supply hydraulic oil to
control valves.
For detail, please refer to “System Description – Turbine Bypass System (Doc. No. :
MD1-0-M-110-03-00002)”

1.4.3


Common systems
1)

Coal Handling System
This system is composed of two (2) lines of conveying system from coal receiving
tower to coal silos via coal storage shed with Four(4) sets of stock piles and two(2)

15


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

sets of coal stacker (04EAD10/20AF001) and reclaimer (04EAF10/20AF001),
transfer towers and coal crusher tower with two(2) sets of vibrating screen
(04ECA61/62AJ001) and coal crusher (04ECA63/64AJ001).
For detail, please refer to “System Description & Operational Description for Coal
Handling System (Doc. No. : MD1-0-V-171-03-02102)”
2)

Limestone Handling System
This system is composed of the following subsystems.
One (1) set of mechanical conveying system including one(1) bucket type ship
unloader (04EDA10AW001) and one(1) limestone tripper car from limestone
unloading jetty to limestone storage shed via Four(4) transfer towers.
One (1) set of limestone mechanical conveying system for limestone preparation
from limestone storage shed to limestone surge bin including one(1) set of reclaiming

hopper (04EBE10BB001), belt feeder (04EDC10AF001), bucket elevator
(04EDC20AF001) and reversible belt feeder (04EDC30AF001).
Two(2) sets of limestone grinding system. Each set includes limestone one(1)
limestone surge bin (04EDE21/22BB001), one(1) tube mill (04EDH11/12AJ001),
one(1) screw conveyor (04EDC51/52AF001), one(1) bucket elevator
(04EDC61/62AF001) and one(1) limestone storage silo (04EDE31BB001).
Two(2) sets of limestone pneumatic conveying system from limestone storage silo to
boiler limestone silo. Each set includes two(2)X100% limestone pneumatic blowers
(04EDP13/14AN001, 04EDP23/24AN001) and two(2) lines of pneumatic pipings.
For detail, please refer to “System Description & Operational Description for
Limestone Handling System (Doc. No. : MD1-0-V-172-03-02102)”

3)

Fuel Unloading and Supply System
This system is composed of the following subsystems.
HFO unloading system including two(2) X100% of HFO unloading pumps (04EGC
10AP001), one(1) Fuel unloading heater (04EGG20AC001), oil/water separator
(04EGR10KT001) and its interconnection piping with its auxiliaries between Fuel Oil
Unloading Jetty (04EGR10BB001) and Fuel Oil Storage Tanks (14EGB10BB001).
Two(2) sets of HFO supply system. Each set is for One(1) unit and is composed of
one(1) HFO storage tanks, Two(2)X100% of HFO supply pumps (14EGC10AP001),
two(2) X100% of two(2) level HFO heaters (14EGT11/12/21/22AC001/002), One(1)

16


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION


Rev.E

set of surge compression chamber (14EGF10BB001) and its interconnection piping
with its auxiliaries between tank and Boiler burners.
DO supply system including DO truck unloading station with header, two(2)X100% of
DO unloading pumps (04EGC20/21AP001) and its interconnection piping, one(1) DO
storage tank (04EGB10BB001), two(2) sets of DO supply pumping stations, each set
of which is composed of two(2) X 100% of DO supply pumps (14EGC20/21 AP001)
for One(1) unit, and its interconnection piping with its auxiliaries between DO storage
tank and boiler burners (11HJA10~80AV101).
For detail, please refer to “System Description –Fuel Oil Unloading and Supply
System (Doc. No. : MD1-0-M-160-03-00001)”
4)

Compressed air system
This system is composed of three(3)X50% of air compressor units, two(2) X 100% of
desiccant type air dryer (03QFF71/72AT001) units for instrument air, two(2) air
receivers for service air (03QFA30/40BB001), two(2) air receivers for instrument
air(03QFA10/20 BB001) and its interconnection piping with its auxiliaries.
For detail, please refer to “System Description – Compressed Air System (Doc.
No. : MD1-0-V-151-02-00017)”

5)

Water treatment system
This system is composed of Preliminary treatment plant, Demineralization, Potable
water treatment plant. The Preliminary treatment plant shall be include two(2) x 50%
of Clarifier, two(2) x 50% of Gravity filter with related ponds, pumps, chemical dosing
units and accessories.
The Demineralization treatment plant is composed of two(2) x 50% of A/C filter,

two(2) x 50% of Cation exchangers, two(2) x 50% of Degasifers, two(2) x 50% of
Anion exchangers, two(2) x 50% of Mixed bed exchangers with related chemical
regeneration facilities, pumps, chemical dosing tank & pumps, chemical storage
tanks and accessories.
The Potable water treatment plant is composed of one(1) of A/C filter, three(3) of
potable water pumps, two(2) of transfer pumps, potable water tank with related
accessories.
For detail, please refer to “System Description – Water Treatment System (Doc.No. :
MD1-0-W-820-03-00001)

6)

Waste water treatment system

17


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

The Wastewater treatment system is composed of one(1) of API oil/water separator,
one(1) of CPI oil/water separator, two(2) of Mixing blowers, one(1) of Clarifiers,
two(2) of A/C filters, two(2) of pressure filters, one(1) of sludge thickener, two(2) of
Backwash pumps, one(1) of wastewater storage pond with related ponds, pumps,
chemical dosing tank & pumps, chemical storage tanks and accessories.
For detail, please refer to “System Description – Waste water Treatment System
(Doc.No. :MD1-0-W-840-03-00001)
7)


Gaseous chlorination system
The Gaseous chlorination system is composed of five(5) of Chlorine evaporators,
five(5) of Chlorinators, five(5) of Sea water pumps, five(5) of Chlorine evaporators,
two(2) Drum weight scale, twenty four (24) Chlorine drums, two(2) of Strainers,
one(1) of Neutralization facility with related chemical tanks & pumps, blowers and
accessories.
For detail, please refer to “System Description – Gaseous Chlorination System
(Doc.No. : MD1-0-W-860-03-00001)

8)

Emergency generator set
Emergency generator set is composed of engine part, which converts chemical
energy into mechanical rotational energy, and generator part, which generate power
from the mechanical rotational motion.
For detail, please refer to “Control Philosophy (Doc. No. : MD1-0-V-182-36-32001)”.

9)

Hydrogen Generating System
Hydrogen generating system is composed of two(2) sets of hydrogen generating
cells (00GKA11AG001) and one(1) set of hydrogen storage (00QKB11/12/13/14
BB001) system with its interconnection piping, valves and auxiliaries.

10) Nitrogen Storage System
Nitrogen Storage System is composed of ten(10) cylinder racks each with forty(40)
bottles of N2 storage and one(1) common pressure reducing manifold with its
interconnecting piping, valves and auxiliaries.
11) Chemical Dosing System

The Chemical Dosing System for boiler system shall be included with Ammonia Bulk
Storage & Transfer System as common for Unit 1 & 2 consisting of one (1) unit
Ammonia Storage Tank, two (2) units Ammonia Transfer Pumps, one (1) unit
Ammonia Seal Tank. The chemical dosing system for Unit 1 is identical for Unit 2

18


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

and this contains Ammonia Dosing System consisting of one (1) unit Ammonia
Dosing Tank, one (1) unit Ammonia Measuring Tank, two (2) units Ammonia Dosing
Pumps; Oxygen Scavenger Dosing System consisting of one (1) unit Hydrazine
Dosing Tank, one (1) unit Hydrazine Measuring Tank, Two (2) units Hydrazine
Dosing Pumps and Phosphate Dosing System consisting of one (1) unit Phosphate
Dosing Tank and three (3) units Phosphate Dosing Pumps.
For detail, please refer to “System Description for Boiler Chemical Dosing System
(Doc.No. : MD1-0-V-850-03-00001)

1.4.4

1.5

Ancillary System
1)

Potable water supply


2)

Firefighting system

3)

Heating, ventilating and air conditioning (HVAC) system

4)

Equipment for monitoring and measurement as requested for environmental control

5)

Cranes, hoists and elevators as required for operation and maintenance

Major System Design Consideration
This clause describes major system design features that should be considered owing to
Two(2) boiler + One(1) STG configuration.
In case of Two(2) boiler and One(1) STG configuration, increase of operating case by two(2)
boilers should be considered. In other words, system design should be done to enable both
boilers operated under different condition.
To achieve such operation, any boiler should be isolated and incoming flow to both boilers
should be adjusted according to load of each boiler.

1.5.1

Boiler Isolation Operation
Boiler isolation operation should be required before main steam pressure and temperature

condition of the second boiler reaches those of the first boiler in start-up operation and during
single boiler operation.
In case of one(1) boiler and one(1) STG configuration, boiler isolation is not necessary since
trip of boiler and STG cause plant trip. Therefore, as schematic diagram of this configuration
(Fig.1), isolation valves between boiler and STG might not be installed. Also, configuration of

19


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

bypass system will be determined between 1X100% and 2X50% per unit owing to economical
reason.

Figure 1. Schematic Diagram of One(1) Boiler & One(1) Boiler
By the way, in case of two(2) boilers and one(1) STG configuration, boiler isolation should be
required during start-up, shut-down and abnormal operation such as run back and single boiler
operation.
For boiler isolation operation, each boiler should be equipped with isolation valves at its main
steam and reheat steam line and One(1) set of bypass system should be allocated to each
boiler. In other words, configuration of bypass system should be of 2X50% per unit. Also,
isolation valve on main steam, hot reheat and cold steam line of each boiler should be
installed and HP bypass piping will be tapped at the upstream of main steam line isolation
valve (13MBA10AA201/202) and connected at the downstream of cold reheat steam line
isolation valve (11LBC10AA201/202). LP bypass piping will be also tapped at the upstream of
hot reheat steam line isolation valve (13LBB10AA201/202) and routed to condenser. (Refer to
Figure 2.)


Figure 2. Schematic Diagram for Boiler isolation operation
Not only turbine trip condition but also blending condition should be considered in bypass
system sizing since its pressure is relatively lower than trip condition though its flow rate is
lower than turbine trip condition.

20


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

As it can be seen in Fig. 2, each bypass system is connected to one condenser. The bypass
system for boiler #1 is connected to condenser “A” and that for boiler #2 to condenser “B”. And
then in start-up operation, heating load to condenser “B” is always higher than condenser “A”
while the second boiler is being isolated. Such load difference between condenser “A” and “B”
causes difference of vacuum pressure between both condensers.
To prevent such potential risk, Steam duct size should be determined to make pressure
difference between both condensers lower than turbine trip setting value when such heating
load difference is maximized.
For detail, refer to “Condenser – Equalizing Duct Sizing Data Sheet (Doc. No.: MD1-0-V-11309-00019)”.

1.5.2

Flow Balancing
At two(2) boilers and one(1) STG configuration, feedwater flow from BFP discharge and cold
reheat steam flow from HP turbine exhaust are divided and enter to both boiler. Also, both
boilers can be operated at different load. Therefore, device for flow balancing of incoming

flows to boiler according to boiler load is necessary.
1)

Feedwater line
In case that variable speed control is applied to Boiler Feedwater Pump, feedwater flow
rate can be controlled by BFP speed instead of feedwater control valve to decrease
auxiliary load of BFP. In many cases that variable speed control is applied to BFP, main
feedwater control valve, which covers from high load(approx. 30% RO) to 100% load, is
not installed to decrease design head of BFP and its auxiliary power consumption at
maximum load.
In case of one(1) boiler and one(1) STG configuration, to achieve three(3) element
control (main steam flow rate/drum level/feedwater flow rate) for feedwater flow control,
main steam flow meter don’t have to be installed because main steam flow rate can be
calculated by the 1st bowl pressure of STG and decrease of friction loss on main steam
line due to removal of main steam flow meter will be helpful to plant performance. (Refer
to Fig.3)

21


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

Figure 3 Schematic Diagram for feedwater control in 1 Boiler + 1 STG
But, for two(2) boiler and one(1) STG configuration, feedwater control valve for both
boiler inlets will be installed though BFP is variable speed control type because
feedwater control device for each boiler should be individually required. Also, main steam
flow meter (11LBA10CF001QB01) is required individually at the outlet of main steam

from each boiler since main steam flow measurement from each boiler is required. (Refer
to Fig. 4)

Figure 4 Schematic Diagram for Feedwater Control in 2 Boiler + 1 STG
2)

Steam Line (Main Steam / Reheat Steam)
These main steam flow meters are also used for balancing of reheat steam flow between
two boilers. Main steam flow rate according to boiler load will be controlled by feedwater
control because feedwater flow rate is basically the same as main steam flow rate except
transient operation. If there is no control device of reheat steam flow, reheat steam flow
rate of both boilers are almost same regardless of difference between both boiler loads. If
both boiler loads are different from each other, hot reheat temperature of boiler with

22


TWO(2) X 500 MW MONG DUONG 1 THERMAL POWER PLANT
PLANT OVERALL DESCRIPTION

Rev.E

smaller load will be too higher and that of the other too lower. To prevent it, reheat steam
flow control is necessary.
For balancing of reheat steam flow, main steam flow meter, cold reheat flow meter
(11LBC10CF001QB01) and cold reheat flow control valve should be installed on the cold
at each boiler side. Since high accuracy for cold reheat steam flow measurement is not
required, ANNOVA type flow meter with small friction loss will be applied.

Figure 5 Schematic Diagram for Steam Control in 2 Boiler + 1 STG

1.5.3

Summary of design consideration for Two(2) Boilers and One(1) STG configuration
Design feature of Two(2) boilers & One(1) STG configuration comparing with One(1) boiler &
One(1) STG configuration is summarized as follows:

No

1

Item

Isolation
Valves

Bypass
2

System
Configuration

3

Steam Duct
Sizing

1 Boiler + 1STG

Not Necessary


1 X 100% or 2 X
50%

2 Boilers + 1
STG

Remark

MOVs on

For boiler

MS/CRH/HRH

isolation

lines

operation
For boiler

Only 2 X 50%

isolation
operation

Unbalanced

Start-up
condition is not

considered

heating load at
blending should
be considered

23

For boiler
isolation
operation