control principles instruction of wgf44013.7_2 style boiler
TRANSCRIPT
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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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
Drum pressureMPa Gain1 0.00 1.0000
2 1.50 1.1206
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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
Secondary air
temperature ( )
Correction factor of
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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WBC Control Principles Instruction SS505-22
Fuel spreading air
temperature ( )
Correction factor of
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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WBC Control Principles Instruction SS505-22
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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WBC Control Principles Instruction SS505-22
Controller output of
oxygen content %
Correction factor of
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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WBC Control Principles Instruction SS505-22
% 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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WBC Control Principles Instruction SS505-22
% 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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WBC Control Principles Instruction SS505-22
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
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
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
16Metal wall-temperature of
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
19Metal wall-temperature of
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
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
value
Range of
measuring
(a reference)
Arranging
locationRemarks
flow
21Connect with spring safety
valve2 Protection 13.70MPa
SH3 outlet
header
Acting value
14.30MPa
Acting value
14.44MPa
22Connect with spring safety
valve2 Protection 2.454MPa
Reheater outlet
header
Acting value
2.80MPa
Acting value
2.99MPa
23Connect with spring safety
valve2 Protection 2.605MPa
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
26Metal wall-temperature of
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
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
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
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
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
43Bed temperature of combustor
emulsion zone middle parts10 Control and monitor 870 01300
Combustor
emulsion zone
middle parts
44Bed temperature of combustor
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
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
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
53Temperature measuring point
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
56Pressure measuring point at
cyclone outlet flue2 Monitor -1900Pa 4000Pa
Cyclone outlet
flue
57Temperature measuring point
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
Temperature measuring point
at loop seal inlet 2 Monitor 870 01300 At loop seal inlet
60Pressure measuring point at
loop seal inlet2 Monitor 6000Pa 010000Pa At loop seal inlet
61Pressure measuring point at
loop seal compartment4 Protect 42000Pa 050000Pa Loop seal air box
Acting value
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Table 1 Measuring point description
No. Measuring name Qty FunctionRunning
value
Range of
measuring
(a reference)
Arranging
locationRemarks
62
Temperature measuring point
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.
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