Control Principles Instruction of WGF44013.7_2 Style Boiler

8/3/2019 Control Principles Instruction of WGF44013.7_2 Style Boiler

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WBC

WGF440/13.7-2 Style Boiler

Control Principles Instruction

SS505-22


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WBC Control Principles Instruction SS505-22

Preface

India MPPL1135MW CFB boiler which is a single drum natural circulation boiler with

high temperature and super high pressure, single middle reheating, a high temperature

insulated cyclone, balanced air draft, coal feeding on front wall, outdoor arrangement. It burns

high moisture and high sulfur lignite and it is designed by Wuhan Boiler Company Ltd. and

Thermophysics Engineering Institute of Chinese Academy of Sciences and made by WuhanBoiler Company Ltd.

The instruction specifies attentive items in boiler on-off process and normal operation

according to design characteristics of this boiler. In accordance with the features of circulating

fluidized bed boiler of this type it also gives alarm value of the main control parameters, MFT

acting values that provide references for the power plant and design institute when carrying

on DCS program, compiling operating rules, running and controlling of the boiler.When reading this instruction, please refer to the following correlative instructions

simultaneously:

1. Boiler Product Specification (SS505-1):

2. Boiler Operating Instruction (SS505-7):

3. Other instructions (such as ash cooler, ignition, soot-blowing, regular blow through,

etc ):


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CONTENTS

1. GENERAL RULES.........................................................................................1

2. SAFETY MEASURES OF RUNNING .........................................................1

2.1 Basic requirements.......................................................................................................................................... ..1

2.2 Measuring points description...........................................................................................................................1

2.3 Limitations of subatmospheric pressure in the furnace................................................................................1

2.4 Drum water level and temperature difference requirements .......................................................................2

2.5 Excess air requirements ................................................................................................................................ ...2

2.6 Furnace bed temperature limitations..............................................................................................................2

2.7 Limitations of air flow and air pressure in the air chamber in the furnace ................................................3

2.8 Protection of reheater pipes .............................................................................................................................3

2.9 Safety valve regulation......................................................................................................................................3


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1. General rules

(1) The contents in the following sections can not be regarded as operating regulations of

the boiler unit. When the power plant compiles and improves its operating regulations

instructions about the boiler, auxiliary equipment and the instruction of initial operation of the

boiler could be used to referring as a instructing datum.

(2) Security of the boiler should be paid attention to in the operating and running.

Circulating fluidized bed combustion technology is different from pulverized coal combustion

technology and other combustion technologies. Circulating fluidized bed boiler doesnt have

obvious fireballs in the furnace. It contains plentiful circulated solids that carrying a lot of

heat.

(3) Before start-up boiler unit the operating workers should be fully familiar with

structure and function of the boiler, assemblies, control system and auxiliary equipments.

(4) Operating workers should be know the working conditions of each assemblies andauxiliary equipments as well as pay attention to actual operating conditions when star-up and

in operation of the boiler according to system requirements.

2. Safety measures of running

2.1 Basic requirements

(1) O ti k t b d b d t ti d f t th t


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WBC Control Principles Instruction SS505-22(3) MFT (main fuel trip) should be set in the furnace outlet pressure value of 2500Pa

and with 5 seconds delay.

(4) Forced and induced draft fans trip should be set in the furnace outlet pressure value

of 3500Pa (without delay).

(5) After forced fans, induced draft fans and all of the loop seal high pressure blowers

shut off (using MFT action to make fans shut off) the collapsed bed materials still occur

combustion. So access door must keep closed .When start-up again the air flow should be

entered in slowly in order to blow combustible in the boiler out of the unit.2.4 Drum water level and temperature difference requirements

(1) Normal water level of the drum is below drum centerline 150mm.Alarm water level

is set in 100mm relative to normal water level. Shutdown water level is set in 175mm and

-200mm relation to the normal water level.

(2) When the drum is at the lowest water level (water level lower than normal water level

200mm) or at the highest water level (water level higher than normal water level 175mm)should carry on MFT and cut off forced fans and induced draft fans.

(3) To prevent the drum from excessive thermal stress variation ratio of the steam drum

metal wall-temperature should be lower than 55 /h. The temperature difference between the

up wall temperature and the down wall temperature of the drum should be controlled less than

40 .The up wall temperature and the down wall temperature of the drum should be

i t d d th t t diff i t ti h ld b t i th t t l


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WBC Control Principles Instruction SS505-22temperature as low as 550 automatically MFT should be carried out or dive into above-bed

assisted combustion or off-bed auxiliary burners. But when bed temperature below 550

whether auxiliary and air duct ignition combustion is operating or not MFT should be carried

out.

According to the accumulated operating experiences and different emphasis between

combustion efficiency of the boiler and desulfurization and nitrogen efficiency in the case of

ensuring the boiler without slag bed temperature could properly regulate according to actual

running bed temperature of the boiler. In the running if the local bed temperature appearsrising it should increase primary air mass flow of the furnace bottom to improve local bad

fluidizing conditions.

2.7 Limitations of air flow and air pressure in the air chamber in the furnace

(1) When the boiler operates normally the air chamber static pressure below the furnace

distributor should maintain between 8000 and 16000Pa.When air chamber static pressure is

below 6000Pa low limitation alarm of the air pressure will be sent out. If air chamber staticpressure is over 18000Pa high limitation alarm of the air pressure will be sent out

(2) When the primary air flow of distributor is below 10104Nm3/h air flux low

limitation alarm will be sent out.

(3) Carry out MFT if it happened following situations:

a. Air chamber pressure in the furnace is above 20000Pa and delays 10 seconds;

b Ai i th i h b i b l 6000P d d l 10 d


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MPa t/h

Drum safety valve 1# 15.74 172.17

Drum safety valve 2# 16.21 177.25Superheater safety valve 1# 14.30 49.51

Superheater safety valve 2# 14.44 49.99

Reheater safety valve at inlet 1# 3.07 139.25

Reheater safety valve at inlet 2# 3.15 142.60

Reheater safety valve at outlet 1# 2.80 47.01

Reheater safety valve at outlet 2# 2.99 37.90

2.10 Control of steam temperatureIn order to monitor start-up conditions we set up wall- thermocouple to measure steam

temperature at the relational components of stream circuitry to confirm allowable heating-up

velocity.

Component Position NO. Alarm temperature value

Drum Top and bottom parts Up-down 6apiece

Temperature difference

between 40

temperature variety 55 /h

Platen

superheater

Upwards platen: top parts 8 /

Downwards platen: at subjacent

outlet of platen8 495

Low temp.

h t

Outlet pipeloop

(even distribution in furnace

idth)

22 430


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WBC Control Principles Instruction SS505-223.1. Strategies and requirements of the furnace safety monitor system

The primary function of the furnace safety monitor system is to implement orderly

management of boiler combustion system. When permission conditions are satisfied the

program controls burners to start-up and shutdown the boiler as well as to maintain burners

operating steadily. When permission conditions are not satisfied we should carry on safe logic

which is designed advanced and essential safeguards for boiler to protect safety of workers

and equipments. These safeguards consist of rapid drop of load, shutdown of the boiler, soot-

blowing of the furnace after shutdown and so on.Primary functions of the furnace safety monitor system are:

(1) The flame monitoring;

(2) The furnace pressure monitoring;

(3) Burners management;

(4) MFT;

(5) Furnace soot-blowing;(6) Other interlock and monitor items.

Primary conditions joined in boiler protection interlock are:

(1) Boiler temperature permitted range;

(2) Steam drum water level is not low;

(3) Steam drum water level is not high;

(4) Ai f hi h i t l


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WBC Control Principles Instruction SS505-22When the MFT occurs it will appears following actions:

(1) Stop flue burner (under-bed burner);

(2) Stop above-bed start-up burner;

(3) Stop coal feeder and rotary valve;

(4) Stop limestone feeder and rotary valve;

(5) Close latch valves of first and secondary spray water;

(6) Close main oil trip valves;

(7) Set total air flow in minimum;(8) Turn the secondary air spray nozzle control to manual actuated.

The main conditions joined in flue and above-bed burner interlock are:

(1) Main oil piping trip valve is open;

(2) Main oil piping trip valve is close;

(3) Main oil piping pressure is low;

(4) Main oil piping pressure is high;(5) Ignition is permitted;

(6) Main oil piping trip valve conditions is satisfied;

(7) Single burner ignition is permitted;

(8) Air flow of the single burner is more than the minimum value;

(9) Oil pressure of the single burner is low;

(10) Oil f th i l b i i l


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Purge logic

(see Chart 2)

MFT logic

[see Chart 1(b)]

Finish the purge

Permit to release MFT relay

N

O

T

A

N

D

A

N

D

Burner logic

in flue

Solid fuel logic

(see Chart4)Main fuel trip(MFT)

Chart 1(a) Interlock system program

Loose induceddraft fan

Loose forceddraught an

Drum water level

is low

Furnace pressure ishigh

Ai fl


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Conditions of the

boiler trip have

b d

All the fuel feeding

equipments havetripped and all the

safty valves have

closed

All the required air

regimes is operating

All the air paths in

purge position

AN

D

Boiler air flow more

than purge air flow

A

It has been startedand completed 5

times volume or

purged for 5minutes(bed hasbeen

fluidized)

O

R

Purge of the

i f l d


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Air used forcobustion of

burnerin flue is notsufficient

Pressure of burner

in flue is dissatisfied

burning source

Burner in

flue"Flameless"

Igniter "Sparkless"

MFT(see Chart 1(b))

MFT relay

(see Chart1 (b))

OR

O

R

Close saftysidengaging valve

of single burner

in flue

Stop striking fire


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Trip of superiorfeeding system

equipment

Parts of solid fuelfeeding system is

in trouble

Bed has not

fluidized

Withourconfirmation ofburner in flue

Permissions of solidfuels bed

temperature aredissatisfied

Bed temperature islow

MFT(see chart 1 (b))

MFT relay

(see Chart 1(b))

A

N

D

OR Trip of solid fuel

feeding system

Chart 4 Solid fuel safety subsystem

3.2 Strategies and requirements of regulation and control

Th i f ti f l ti d t l t (Th d t b l t


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WBC Control Principles Instruction SS505-22transfer process.

(2) Mass flow compensation control circuit

Measuring value of total fuel mass flow (coal and fuel oil) regards as feedback signal of

the coal mass flow control circuit and required amount signal of the air flow control circuit

must consider some changes of the boiler heat transfer status and fuel heat value. Therefore,

total fuel flow must be compensated.

(3) Feed water mass flow control circuit

This circuit design must ensure that balance between feed water flow of the boiler and

that of steam flow in order to maintain the required water level in drum. During the start-up

period above process is realized by controlling the opening degree of the start-up feed water

regulate valve. In normal operating period above process is realized by controlling the

opening degree of the main feed water regulate valve. These two valves receive their control

signals respectively from single momentum controller or three- momentum controller. The

single momentum control could control automatically but also could control manually. Three-momentum control could cascade control but also could control manually in operation. Single

momentum control inspects steam drum only and is used in start-up. Three- momentum

control inspects drum water level, steam mass flow and feed water mass flow. It has high

control level and is used in the steady heavy load condition.

(4) Primary air heater control circuit

Th t l t i d t t l th ld d t t f i h t t


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WBC Control Principles Instruction SS505-22adjustment. The main controller responds according to temperature difference between the

temperature at SH3 outlet and the setting value of the manual actuated. Assistant controller

responds according to temperature difference between modified temperature by main

controller and temperature at SH2 outlet. The final main steam temperature left boiler controls

in 540 .

(6) Steam temperature of reheater control circuit

The whole steam temperature control is realized by spraying water of desuperheater to

control temperature of steam left reheater. This control is based on cascade adjustment. The

main controller responds according to temperature difference between temperature at RH2

outlet and the setting value of the manual actuated. Assistant controller responds according to

temperature difference between temperature modified by main controller and temperature at

RH1 outlet. The final temperature of steam left reheater is controlled in 540 .

(7) Bed temperature control circuit

The purpose of this circuit is to keep bed temperature at setting value according to loaddemands. The setting value is 870 . Operating in this temperature could ensure optimal

combustion efficiency and optimal desulfuration efficiency. For controlling bed temperature

at this level the ratio of the primary air and the secondary air should change with bed

temperature.

(8) Primary air flow control circuit

Th i id d b i i f h f ll i f ti


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WBC Control Principles Instruction SS505-22damper is controlled. During start-up burner exit operation the damper should be set at a fixed

opening degree. Cold air flow of the single burner can not lower than 8788 Nm 3/h to protect

the burner injections from burnout.

Air distribution of the off-bed burner: There are 2 off-bed burners. Every start-up burner

has 3 damper regulators. They are a damper used for oil burner combustion, a cooling air

dampers and a main fluidizing air damper. At start-up the main fluidizing air damper is

closed. After converting the oil mass flow of the burner into combustion air flow (excess air

ratio 1.1) and cooling air flow (excess air ratio 3), then comparing with actual measured

air flow. Consequently opening degree of the air damper is controlled. During the initial start-

up period the damper could reduce gradually to protect temperature excursion of

precombustion pot after cooling air dampers opened entirely. After burner outage the main

fluidizing dampers opened gradually, air dampers for combustion and dampers for cooling are

closed gradually to maintain total primary air s flow at the bottom of furnace.

(11) Furnace draft (subatmospheric pressure) control circuitThe boiler is balance draft boiler which is defined as by controlling the discharge amount

of combustion product and excess air amount relative to feeding in order to maintain the

pressure of a certain characteristic point constant in the furnace. The pressure balance point of

this boiler is set at furnace outlet. Induced draft fan sucks flue gas from dust separator and

vents cleanly flue gas to stack. Subatmospheric pressure of furnace could be realized by

lli h d i d f h i d d d f


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WBC Control Principles Instruction SS505-22(15) An attachment of Control circuit

Control circuit Regulated parameter Control variable Control components

Boiler load controlMain steam mass flow

and pressure

coal feed mass

flow, oil mass flow

Feeder revolution

numbers, oil-firing

regulator valve

Feed water mass

flow control Drum water level

Feed water

mass flow

feed water regulator valve

Speed governing feedpump

Superheater

temperature control

Superheater

temperature

desuperheated

water mass flow

desuperheat water

regulator valve

Bed

temperature controlBed temperature

ratio of primary air

and secondary air

primary air and secondary

air control dampers

bed pressure control Bed pressure Tapping mass flow

Roller ash cooler rate

rotational speed control

Furnace draft control Furnace draft Flue gas mass flowdamper at

induced draft fan inlet

primary air

flow control

Primary air mass flow,

bed temperature

Primary air

mass flow

Guide vane at

primary air fan inlet

secondary air

fl l

Oxygen content in flue,

b d

secondary air flowTotal damper of

d i fl


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4. Boiler function curves

This section provides function curves of the boiler. It is only a reference for designing

boiler control system.

1 3

1.4

Correctionfact

orofmans t

eam

massfl o

w

Temperature correction factor of the main steam mass flow


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Temperature correction factor of feed water mass flow

0.8

0.9

1.0

1.1

1.2

0 100 200 300 400

Temperature of feed water

Correct

ion

factor

offeed

water

massflow


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Pressure correction factor of main steam mass flow

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0.0 5.0 10.0 15.0 20.0

Pressure of main steam MPa

Correct

ion

factor

ofmain

steam

mass

flow


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Drum pressureMPa Gain1 0.00 1.0000

2 1.50 1.1206


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Drum pressureMPa Deviationmm1 0.00 0.00002 1.50 38.9471

3 3.00 60.5434

4 4.50 79.5728

5 6.00 98.1170

6 9.00 137.4645

7 11.00 167.8156


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Total secondary airtemperature ( )

Correction factor ofair mass flow

1 0.0 1.0622

2 10.0 1.0432

3 20.0 1.0253

4 32.0 1.0000

5 40.0 0.9920


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Primary air temperature

Correction factor of

air mass flow

1 0.0 1.3693

2 100.0 1.1715

3 150.0 1.1001

4 200.0 1.04035 250.0 1.0000

6 300.0 0.9452

7 350.0 0.9065

8 400.0 0.8721


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Secondary air

temperature ( )


air flow

1 0.0 1.3693

2 100.0 1.1715

3 150.0 1.1001

4 200.0 1.0403

5 250.0 1.0000

6 300.0 0.9452

7 350.0 0.9065

8 400.0 0.8721


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Fuel spreading air

temperature ( )


air flow

1 0.0 1.3693

2 100.0 1.1715

3 150.0 1.10014 200.0 1.0403

5 250.0 1.0000

6 300.0 0.9452

7 350.0 0.9065

8 400.0 0.8721


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Steam mass flow Excess oxygen content

t/h %

1 65.0 14.3000

2 123.8 9.7000

3 200.0 4.0000

4 220.0 2.7000

5 303.0 2.7000

6 398.0 2.70007 440.0 2.7000


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Controller output of

oxygen content %


oxygen content

1 0.0 0.802 50.0 1.00

3 100.0 1.20

Relation of deviation amount of bed temperature manual actuated and primary air flow

15.0


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% KNm3/h

1-50.0 -10.00

20.0 0.00

350.0 10.00

Relation of deviation amount of bed temperature manual actuated and upper secondary air flow

10.0


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% KNm3/h

1 -50.0 -5.00

2 0.0 0.00

3 50.0 5.00

0.0

5.0

10.0

second

aryair

flow

Km3

/h

Relation of deviation amount of bed temperature manual actuated

and middle and lower secondary air flow


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3 50.0 5.00


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Table 1 Measuring point description

No. Measuring name Qty FunctionRunning

value

Range of

measuring

(a reference)

Arranging

locationRemarks

1 Feed water mass flow 1Regulate feed water

flow440t/h 0550t/h

Feed water

pipeline

2Total desuperheated water

mass flow of superheater1 Monitor 21.94t/h 050t/h

Superheater

desuperheated

water total pipe

Maximum 32t/h

3Feed water temperature in

front of operation floor1

Correction of

feed water flow248 0400

Feed water

pipeline

4Pressure at

economizer inlet2

Monitor for spot,

remote transmission

monitor

15.35MPa 025MPaFeed water

pipeline

5Temperature at economizer

inlet1 BTU compensation 248 0400

Feed water

pipeline

6Temperature at economizer

outlet2 Monitor 300 0400

Economizer

outlet header

7Drum up and down wall-

temperature measuring point

6

pairsMonitor

342 ,

temperature

difference is

40

0400 Drum

8 Drum water level alarm 2 Interlock protection 100 300 Drum

Acting value: 175mm

9Drum water level automatic

regulating3

Water level

regaulatingDrum

W

BC

ControlPrinciplesInstruc

tion

SS505-

22

29


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

10Connect with spring safety

valve2 Protection 14.99MPa Drum

Acting value

14.991.08MPa

Acting value

14.991.05MPa

11Drum pressure measuring

point5

Monitor, correct

stream drum water

level pressure

14.99MPa 025MPa Drum

12Metal wall-temperature at

SH1 outlet tube22 Monitor 430 0800 At SH1 outlet

13Steam temperature at

SH1 outlet4 Monitor 410 0600

At SH1 outlet

pipe

14Steam temperature at

SH2 inlet6

Monitor, correct spay

water mass flow394 0600

At SH2 inlet

pipe

15Metal wall-temperature of

SH2 upwards panels tube8 Monitor 455 0800

Upper parts of

SH2 upwards

panel


SH2 upwards panels tube8 Monitor 495 0800 At SH2 outlet

17 SH2 outlet steam temperature 4Regulate spay water

mass flow473 0600

At SH2 outlet

pipe

18 SH3 inlet steam temperature 6monitor, correct spay

water mass flow 452 0600At SH3 inlet

pipe


SH3 outlet tube22 Monitor 550 0800 At SH3 outlet

20 SH3 outlet steam temperature 4 Monitor and Regulate

spay water mass

540 0~600 Main steam

outlet pipeline

W

BC


tion

SS505-

22

30


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

flow


valve2 Protection 13.70MPa

SH3 outlet

header

Acting value

14.30MPa

Acting value

14.44MPa



Reheater outlet

header

Acting value

2.80MPa

Acting value

2.99MPa



Reheater inlet

header

Acting value

3.07MPa

Acting value

3.15MPa

24Reheater inlet steam

temperature4 Protection 326 0600

Reheater inlet

header

Acting value

366

25Low temp. reheater inlet

steam temperature6 Monitor 326 0600

Pipeline at

reheater steam

inlet


low temp.reheater22 Monitor 480 0800 RH1

27Low temp. reheater outlet

steam temperature4 Monitor 459 0~600

RH1 outlet

pipeline

28High temp. reheater inlet

steam temperature6 Monitor and regulate 452 0~600

RH2 inlet

pipeline

W

BC


tion

SS505-

22

31


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

29

High temp. reheater outside

track pipe metal wall-

temperature

12 Monitor 550 0800 RH2

30High temp. reheater outlet

steam temperature4 Monitor and regulate 540 0600

RH2 outlet

pipeline

31Reheater desuperheated water

mass flow2 Monitor 2.78t/h 08t/h

Reheater

desuperheater

Maximum

3t/h

32Superheater desuperheat

water mass flow2 Monitor 8.3t/h 015t/h

Superheater

desuperheater

Maximum

11.5t/h

33Superheater desuperheat

water mass flow2 Monitor 2.8t/h 08t/h

Superheater

desuperheater

Maximum

4.5t/h

34

Reheater

Accidental spay water mass

flow

2 Monitor 0t/h 010t/hAccidental

desuperheaterMaximum 10t/h

35Wall-temperature measuring

point of off-bed burner6 Monitor and control 900 01300

On the burner

precombustion

pot inside wall

Acting value

>1100

36

Outlet flue gas temperature

measuring point of off-bed

burner

4 Monitor and control 850 01300 At burner outletActing value

>900

37

Furnace compartment

pressure 4

Regulate ash

discharge 14500Pa 022000PaFurnace

compartment

Operating range

800016000Pa

38

Water-cooling air box

temperature measuring

point

2 Monitor 260 01300Water-cooling air

box

W

BC


tion

SS505-

22

32


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

39 Pressure of combustoremulsion zone lower parts

10 Monitor and regulateash discharge

7000Pa 015000Pa

Combustor

emulsion zone

lower parts

40Pressure of combustor

emulsion zone middle parts6 Monitor 4000Pa 06000Pa

Combustor

emulsion zone

middle parts

41Pressure of combustor

emulsion zone upper parts6 Monitor 2000Pa 04000Pa

Combustor

emulsion zone

upper parts

42Bed temperature of combustor

emulsion zone lower parts

10 Control and monitor 870 01300Combustor

emulsion zone

lower parts


emulsion zone middle parts10 Control and monitor 870 01300

Combustor

emulsion zone

middle parts


emulsion zone upper parts10 Monitor 870 01300

Combustor

emulsion zone

upper parts

45 Combustor outlet pressure 10Monitor, protect

and regulate0 200Pa Combustor outlet

Acting value

>3500Pa

46 SH3 inlet flue gas temperature 2 Monitor 820 01300 At SH3 inlet

47 SH1 inlet flue gas temperature 2 Monitor 690 0~800Cagewall

superheater

48SH1 outlet flue gas

temperature2 Monitor 551 0800

Cagewall

superheater

W

BC


tion

SS505-

22

33


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

49

Economizer inlet flue gas

temperature 2 Monitor 420

0800

Economizer

casing

50Economizer outlet flue gas

temperature2 Monitor 293 0800

Economizer

casing

51Oxygen content measuring

point at economizer inlet flue2 Air flow regulating 2.70% 020%

Economizer

casing

52Temperature measuring point

at air preheater outlet flue2 Monitor 146 0800

Air preheater

casing


at cyclone inlet flue4 Monitor 870 01300

Cyclone inlet

flue

54

Temperature measuring point

at cyclone outlet flue 4 Monitor 870 01300

Cyclone outlet

flue

55Pressure measuring point at

cyclone inlet flue2 Monitor -200Pa 4000Pa

Cyclone inlet

flue


cyclone outlet flue2 Monitor -1900Pa 4000Pa

Cyclone outlet

flue


on the loop seal lift line2 Monitor 880 01300

Cyclone lower

parts

58Pressure measuring point on

the loop seal lift line2 Monitor -1000Pa 4000Pa

Cyclone lower

parts

59


at loop seal inlet 2 Monitor 870 01300 At loop seal inlet


loop seal inlet2 Monitor 6000Pa 010000Pa At loop seal inlet


loop seal compartment4 Protect 42000Pa 050000Pa Loop seal air box

Acting value


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value

Range of

measuring

(a reference)

Arranging

locationRemarks

62


of loop seal 2 Monitor 870

01300

Loop seal

gradient leg

63Pressure measuring point of

loop seal2 Monitor 6000Pa 012000Pa

Loop seal

gradient leg

Note: Other measuring points refer to arrangement drawing of measuring point and combustion system drawing.

W

BC


tion

SS505-

22

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Control Principles Instruction of WGF44013.7_2 Style Boiler

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Transcript of Control Principles Instruction of WGF44013.7_2 Style Boiler