CN109681909A - A kind of W type flame combustion mode boiler uses the method for controlling combustion of meager coal - Google Patents

A kind of W type flame combustion mode boiler uses the method for controlling combustion of meager coal Download PDF

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CN109681909A
CN109681909A CN201811561617.5A CN201811561617A CN109681909A CN 109681909 A CN109681909 A CN 109681909A CN 201811561617 A CN201811561617 A CN 201811561617A CN 109681909 A CN109681909 A CN 109681909A
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mill
import
coal
cold
wind
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CN109681909B (en
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陈辉
杨希刚
蔡培
戴维葆
王爱英
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Guoneng Nanjing Electric Power Test Research Co.,Ltd.
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Guodian Nanjing Electric Power Test Research Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N1/00—Regulating fuel supply
    • F23N1/02—Regulating fuel supply conjointly with air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2223/00—Signal processing; Details thereof
    • F23N2223/40—Simulation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2239/00—Fuels
    • F23N2239/02—Solid fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05003—Measuring NOx content in flue gas

Abstract

The invention discloses the method for controlling combustion that a kind of W type flame combustion mode boiler uses meager coal, for the method for controlling combustion by adjusting to coal pulverizer operation method, control fineness of pulverized coal R90 is 2.9-6.1%.Meager coal progress fineness of pulverized coal control is being used to W type flame combustion boiler using control method of the present invention, fineness of pulverized coal is being can be effectively reduced, reduces boiler flyash carbon content, economizer exit NOx concentration, improve boiler efficiency and unit economy.

Description

A kind of W type flame combustion mode boiler uses the method for controlling combustion of meager coal
Technical field
Control method when meager coal is used the present invention relates to W type flame combustion boiler.
Background technique
Station boiler is actually located at low nitrogen burning, use economic coal and middle-low load operation be overlapped mutually in the state of transport Row produces many quite serious problems: the economic problems such as flying dust, slag phosphorus content increase, and spray water flux increases；Heating surface Coking, burner hearth high temperature corrosion, the safety problems such as low-load combustion-stabilizing；NOXProduction quantity is exceeded, and spray ammonia is excessive, the rings such as preheater blocking Guarantor's problem.The solution or alleviation of the above problem, key problem in technology all point to fineness of pulverized coal.Thinner coal dust increases solid particle ratio Surface area enhances precipitation, kindling, surely fires, burns each process, and to reducing, flying marking is advantageous, advantageous to low nitrogen burning；Phase When reducing nitrogen in quickly touching oxygen in the more cokes in primary zone --- oxygen reaction generates NOXWith enhance NOXTurn It is melted into N2Physics probability and chemical kinetic energy, that is, the anoxycausis under excess air coefficient permanence condition is furthermore achieved, To reduction NOXFavorably；Mean the smaller inertia of pulverized coal particle, reduce by rotation flue gas throw to boundary pyrolysis, burning it is strong Degree, improves burner hearth wall surface reproducibility atmosphere, and to mitigating, high temperature corrosion is advantageous.The reasonable selection of studying coal powder fineness, to solution Burning there are the problem of, have realistic price.
Summary of the invention
The purpose of the present invention is to solve defect existing in the prior art, provide it is a kind of to when using meager coal to coal dust Fineness reasonably selects and adjustment, to reduce boiler flyash carbon content, economizer exit NOXConcentration improves boiler efficiency and machine Group economy.
In order to achieve the above object, the present invention provides a kind of W type flame combustion mode boilers to use poor burning of coal control Method processed, the method for controlling combustion is by adjusting coal pulverizer operation method, and control fineness of pulverized coal R90 is 2.9-6.1%, preferably Fineness of pulverized coal R90 control is 3.0%-6.0%.
Optimal, above-mentioned fineness of pulverized coal R90 control is 3.0%-3.2%.
Method for controlling combustion of the present invention, the specific steps are as follows:
(1) it under boiler low nitrogen burning state, maintains unit load constant, maintains burnout degree ratio, operation oxygen amount, coal-grinding It is constant that machine runs number of units；
(2) as follows to tetra- coal mill controls of ABCD when unit load is 330MW:
A grinds power 40t/h, mill import primary wind pressure 5.3kPa, 294 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 3.3kPa-4.4kPa, A mill ventilation It is 100 DEG C -102 DEG C that amount, which is 45.8t/h-46t/h, A disintegrating outlet temperature,；
B grinds power 27t/h, mill import primary wind pressure 5.3kPa, 292 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 4.0kPa-4.6kPa, B mill ventilation It is 101 DEG C -102 DEG C that amount, which is 40.5t/h-41.1t/h, B disintegrating outlet temperature,；
C grinds power 37t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 3.7kPa-4.6kPa, C mill ventilation It is 105 DEG C -106 DEG C that amount, which is 35.8t/h-36t/h, C disintegrating outlet temperature,；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 3.7kPa-4.3kPa, D mill ventilation It is 99 DEG C -100 DEG C that amount, which is 37.8t/h-39t/h, D disintegrating outlet temperature,；
It is as follows to tetra- coal mill controls of ABCD when unit load is 260MW:
A grinds power 30t/h, mill import primary wind pressure 5.0kPa, 270 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 40%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 2.8kPa-3.3kPa, A mill are logical Air quantity is that 32.9t/h-33t/h, A disintegrating outlet temperature are 112 DEG C -115 DEG C；
B grinds power 22t/h, mill import primary wind pressure 5.0kPa, 293 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 40%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 2.8kPa-3.5kPa, B mill are logical Air quantity is that 29.1t/h-29.8t/h, B disintegrating outlet temperature are 111 DEG C -112 DEG C；
C grinds power 31t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 3.2kPa-3.8kPa, C mill ventilation It is 105 DEG C -106 DEG C that amount, which is 31.9t/h-33t/h, C disintegrating outlet temperature,；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is 3.4kPa-4.0kPa, D mill ventilation It is 100 DEG C -102 DEG C that amount, which is 32.8t/h-34t/h, D disintegrating outlet temperature,.
Wherein, it in step (1) under boiler low nitrogen burning state, maintains unit load 330MW or 260MW constant, maintains Burnout degree ratio 25% is constant, and when unit load is 330MW, operation oxygen amount maintains 3.85%-4.06%, works as unit load 4.38%-4.46% is maintained to run oxygen amount when 260MW.
It is as follows to the specific control method of tetra- coal pulverizers of ABCD in step (2):
When 330MW load, A grinds power 40t/h, mill import primary wind pressure 5.3kPa, mill 294 DEG C of import wind-warm syndrome, hot air disperser Aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.3kPa, 4.0kPa, 4.4kPa), A grind ventilation quantity (45.8t/h, 46t/h, 45.9t/h), A disintegrating outlet temperature (100 DEG C, 101 DEG C, 102 DEG C), fineness of pulverized coal R90 be respectively (6%, 4.5%, 3.2%).B grinds power 27t/h, mill import primary wind pressure 5.3kPa, mill 292 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.7kPa, 4.0kPa, 4.6kPa), B mill ventilation quantity (40.5t/h, 41t/h, 41.1t/h), B disintegrating outlet temperature (102 DEG C, 101 DEG C, 102 DEG C), fineness of pulverized coal R90 are respectively (5.8%, 4.3%, 3.0%). C grinds power 37t/h, mill import primary wind pressure 5.3kPa, mill 295 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.7kPa, 4.0kPa, 4.6kPa), C mill Ventilation quantity (35.8t/h, 36t/h, 35.9t/h), C disintegrating outlet temperature (106 DEG C, 105 DEG C, 106 DEG C), fineness of pulverized coal R90 difference For (6.1%, 4.3%, 3.1%).D grinds power 33t/h, mill import primary wind pressure 5.3kPa, mill 295 DEG C of import wind-warm syndrome, hot wind Door aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.7kPa, 4.0kPa, 4.3kPa), D grind ventilation quantity (37.8t/h, 38t/h, 39t/h), D disintegrating outlet temperature (100 DEG C, 99 DEG C, 99 DEG C), fineness of pulverized coal R90 be respectively (5.8%, 4.0%, 3.1%).
When 260MW load, A grinds power 30t/h, mill import primary wind pressure 5.0kPa, mill 270 DEG C of import wind-warm syndrome, hot air disperser Aperture 100%, cold-air flap aperture 40%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (2.8kPa, 3.2kPa, 3.3kPa), A grind ventilation quantity (33t/h, 33t/h, 32.9t/h), A disintegrating outlet temperature (115 DEG C, 114 DEG C, 112 DEG C), fineness of pulverized coal R90 be respectively (6.2%, 4.1%, 3.0%).B grinds power 22t/h, mill import primary wind pressure 5.0kPa, mill 293 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 40%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (2.8kPa, 3.2kPa, 3.5kPa), B mill ventilation quantity (29.6t/h, 29.8t/h, 29.1t/h), B disintegrating outlet temperature (112 DEG C, 111 DEG C, 112 DEG C), fineness of pulverized coal R90 are respectively (5.6%, 4.0%, 3.1%). C grinds power 31t/h, mill import primary wind pressure 5.3kPa, mill 305 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.2kPa, 3.5kPa, 3.8kPa), C mill Ventilation quantity (32.8t/h, 33t/h, 31.9t/h), C disintegrating outlet temperature (106 DEG C, 105 DEG C, 106 DEG C), fineness of pulverized coal R90 difference For (6.0%, 3.9%, 2.9%).D grinds power 33t/h, mill import primary wind pressure 5.3kPa, mill 305 DEG C of import wind-warm syndrome, hot wind Door aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.4kPa3.7kPa, 4.0kPa), D grind ventilation quantity (32.8t/h, 33t/h, 34t/h), D disintegrating outlet temperature (100 DEG C, 102 DEG C, 102 DEG C), fineness of pulverized coal R90 be respectively (5.9%, 3.9%, 3.1%).
Preferably, as follows to the control method of tetra- coal pulverizers of ABCD in step (2):
When unit load is 330MW,
A grinds power 40t/h, mill import primary wind pressure 5.3kPa, 294 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency be 50Hz, coal pulverizer inlet and outlet differential pressure be 4.4kPa, A mill ventilation quantity be 45.9t/h, A disintegrating outlet temperature is 102 DEG C；
B grinds power 27t/h, mill import primary wind pressure 5.3kPa, 292 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency be 50Hz, coal pulverizer inlet and outlet differential pressure be 4.6kPa, B mill ventilation quantity be 41.1t/h, B disintegrating outlet temperature is 102 DEG C；
C grinds power 37t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency be 50Hz, coal pulverizer inlet and outlet differential pressure be 4.6kPa, C mill ventilation quantity be 35.9t/h, C disintegrating outlet temperature is 106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.3kPa, D mill ventilation quantity are 39t/h, D Disintegrating outlet temperature is 99 DEG C；
When unit load is 260MW,
A grinds power 30t/h, mill import primary wind pressure 5.0kPa, 270 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 40%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 3.3kPa, A mill ventilation quantity are 32.9t/ H, A disintegrating outlet temperature is 112 DEG C；
B grinds power 22t/h, mill import primary wind pressure 5.0kPa, 293 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 40%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 3.5kPa, B mill ventilation quantity are 29.1t/ H, B disintegrating outlet temperature is 112 DEG C；
C grinds power 31t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency be 50Hz, coal pulverizer inlet and outlet differential pressure be 3.8kPa, C mill ventilation quantity be 31.9, C mill Outlet temperature is 106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold Throttle opening 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.0kPa, D mill ventilation quantity are 34t/h, D Disintegrating outlet temperature is 102 DEG C.
The present invention has the advantage that compared with prior art
Meager coal progress fineness of pulverized coal control, Neng Gouyou are being used to W type flame combustion boiler using control method of the present invention Effect reduces fineness of pulverized coal, reduces boiler flyash carbon content, economizer exit NOXConcentration improves boiler efficiency and unit economy.
Detailed description of the invention
Fig. 1 is the present invention to the Anshun Guo electricity power plant 1# furnace numerical simulation three-dimensional and grid chart；
Fig. 2 is the comparison diagram of 330MW load difference fineness of pulverized coal lower hearth thermo parameters method；
Fig. 3 is that burner nozzle volatile matter profiles versus schemes under 330MW load difference fineness of pulverized coal；
Fig. 4 is 330MW load difference fineness of pulverized coal lower hearth CO concentration distribution comparison diagram；
Fig. 5 is 330MW load difference fineness of pulverized coal lower hearth NOxConcentration distribution comparison diagram (also make an abstract attached drawing)；
Fig. 6 is coal dust under 330MW load difference fineness of pulverized coal in burner hearth residence time comparison diagram；
Fig. 7 is the comparison diagram of 260MW load difference fineness of pulverized coal lower hearth thermo parameters method；
Fig. 8 is that burner nozzle volatile matter profiles versus schemes under 260MW load difference fineness of pulverized coal；
Fig. 9 is 260MW load difference fineness of pulverized coal lower hearth CO concentration distribution comparison diagram；
Figure 10 is 260MW load difference fineness of pulverized coal lower hearth NOxConcentration distribution comparison diagram；
Figure 11 is coal dust under 260MW load difference fineness of pulverized coal in burner hearth residence time comparison diagram.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
The embodiment of the present invention is with the Anshun Guo electricity electricity generating corporation, Ltd 1# boiler model DG1025/18/2-II10 type W type fire Flame boiler is the subcritical centre that east boiler limited liability company introduces that U.S.'s Foster-Wheeler company technique is manufactured Single reheat natural circulation boiler.Double-arch type list burner hearth, burner arrangement are in W type flame on arch before and after lower hearth, and tail portion is double Flue structure adjusts reheat steam temperature, dry ash extraction, all steel framework, full overhung construction, balanced draft, outdoor arrangement using baffle Boiler.Pulverized coal preparation system uses the direct-firing system of double-in and double-out tube mill positive pressure, and 4 coal pulverizers are Shenyang heavy-duty machine Limited Liability The BBD4060 type of company's production, uses meager coal.
Combustion apparatus uses double arch adiabatic furnaces, burner arrangement encircles upper, binary channels air-coal separating before and after lower hearth Low-NOx pulverized coal burner, staged air distribution, " W " flame combustion mode.Burner hearth is divided into upper and lower two parts, total height 48153mm, on 24765 × 7620mm of size of burner hearth, 24765 × 13725mm of lower hearth size.Boiler main design parameters are shown in Table 1.
Boiler main design parameters see the table below 1.
1 Boiler Main Parameter table (design coal) of table
Title Unit MCR 75%ECR
Superheat steam flow t/h 935 701.3
Superheater outlet steam pressure MPa 17.42 17.14
Superheater outlet vapor (steam) temperature ℃ 540 540
Drum pressure MPa 18.54 17.77
Reheated steam flow t/h 780.66 595
Reheated steam import/export pressure MPa 3.60/3.44 2.76/2.63
Reheated steam import/export temperature ℃ 316/540 299/540
Feed temperature ℃ 267 250
Exhaust gas temperature (after amendment) ℃ 140 133
Level-one spray water flux t/h 14.6 7.1
Second level spray water flux t/h 7.3 3.5
Coal consumption t/h 119.3 92.94
Boiler efficiency % 90.59 90.88
W type flame combustion boiler of the present invention uses in the numerical simulation and experimental study of meager coal powder fineness control method, coal Kind is close with power plant design coal, and coal is shown in Table 2.
2 boiler design coal data of table
Project Unit Design coal Test coal
As-received carbon % 59.95 56.19
As-received hydrogen % 2.25 2.03
As-received oxygen % 0.57 0.95
As-received nitrogen % 0.94 0.94
As-received sulphur % 2.29 3.14
Moisture as received coal % 7 7.90
As-received ash content % 27 28.85
As-received low heat value kJ/kg 21443 21100
Dry ash free basis volatile matter % 12.5 13.2
Erosive index / 69 65
As can be seen from Table 2, it tests coal and design coal is not much different, be meager coal.
Embodiment 1 (330MW load)
The coal pulverizer that the present embodiment specifically puts into operation is ABCD4 platform coal pulverizer.
Front-back wall combustion system boiler of the present invention uses high-ash bituminous coal fineness of pulverized coal control method, and specific step is as follows:
(1) it under boiler low nitrogen burning state, maintains unit load 330MW load constant, maintains burnout degree ratio (25%), it is constant that oxygen amount (3.85%-4.06%), coal pulverizer operation number of units (ABCD mill) etc. are run, passes through numerical simulation analysis Influence of the different fineness of pulverized coal to boiler combustion.With FLUENT numerical simulation software suggestion mode, grid dividing, carry out coal dust Fineness R90 is respectively 6%, 4.5% and 3.2% numerical simulation calculation；
(2) field test research is carried out according to the numerical simulation result of the first step, under boiler low nitrogen burning state, maintained Burnout degree ratio (25%), operation oxygen amount (330MW load when 3.85%-4.06%), coal pulverizer run number of units (330MW load When ABCD grind) etc. constant, the influence by analysis of experiments difference fineness of pulverized coal to boiler combustion.
When 330MW load, A grinds power 40t/h, mill import primary wind pressure 5.3kPa, mill 294 DEG C of import wind-warm syndrome, hot air disperser Aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.3kPa, 4.0kPa, 4.4kPa), A grind ventilation quantity (45.8t/h, 46t/h, 45.9t/h), A disintegrating outlet temperature (100 DEG C, 101 DEG C, 102 DEG C), fineness of pulverized coal R90 be respectively (6%, 4.5%, 3.2%).B grinds power 27t/h, mill import primary wind pressure 5.3kPa, mill 292 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.0kPa, 3.4kPa, 3.6kPa), B mill ventilation quantity (40.5t/h, 41t/h, 41.1t/h), B disintegrating outlet temperature (102 DEG C, 101 DEG C, 102 DEG C), fineness of pulverized coal R90 are respectively (5.8%, 4.3%, 3.0%). C grinds power 37t/h, mill import primary wind pressure 5.3kPa, mill 295 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.7kPa, 4.0kPa, 4.6kPa), C mill Ventilation quantity (35.8t/h, 36t/h, 35.9t/h), C disintegrating outlet temperature (106 DEG C, 105 DEG C, 106 DEG C), fineness of pulverized coal R90 difference For (6.1%, 4.3%, 3.1%).D grinds power 33t/h, mill import primary wind pressure 5.3kPa, mill 295 DEG C of import wind-warm syndrome, hot wind Door aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.7kPa, 4.0kPa, 4.3kPa), D grind ventilation quantity (37.8t/h, 38t/h, 39t/h), D disintegrating outlet temperature (100 DEG C, 99 DEG C, 99 DEG C), fineness of pulverized coal R90 be respectively (5.8%, 4.0%, 3.1%).
(3) numerical simulation and experimental study are combined, when W type flame combustion mode boiler low nitrogen burning state uses meager coal coal Powder fineness (R90) Optimal Control value is 3% or so.
1, numerical simulation analysis process and result
This simulation is by being modeled and being simulated to full burner hearth.Fig. 1 is the grid dividing situation of boiler model, in order to more quasi- The combustion case of true reaction primary combustion zone, takes encryption to the grid of each burner position of primary combustion zone.
The hearth combustion flame kernel and temperature change of this simulation main research transformation front and back, therefore in this simulation The heat absorption situation of heating surface is not studied in detail.
Under 330MW load, consider under boiler for deeply nitrogen combustion state, burnout degree ratio about 25%, Secondary Air is maintained to match Wind mode, operation oxygen amount, coal pulverizer operation number of units etc. are constant, change fineness of pulverized coal (R90Respectively 6%, 4.5% and 3%), Middle fineness of pulverized coal 6% is calculated according to " pulverized coal preparation system design calculates directive/guide " -2012 editions recommendation calculation formula.Analyze coal dust Fineness changes the influence to burning.Numerical simulation operating condition is shown in Table 3.Analog result is shown in Table 4, Fig. 2-Fig. 6.
Different fineness of pulverized coal numerical simulation operating conditions under 3 330MW of table
Operating condition Operating condition 1 Operating condition 2 Operating condition 3
Operating condition explanation α=1.24 α=1.24 α=1.24
Operating condition explanation Fine powder 6 Fine powder 4.5 Fine powder 3
R90=6.00% R90=4.50% R90=3.00%
SOFA wind ratio 25% 25% 25%
Different fineness of pulverized coal numerical simulation results under 4 330MW of table
The low nitrogen combustion of 330MW load, burnout degree ratio 25% or so, unit depth it can be seen from table 3- table 4, Fig. 2-Fig. 6 Under burning mode, it is more apparent to combustion effects to change fineness of pulverized coal.
(1) reduction to attenuate with coal dust, the specific surface area that the coal dust of unit mass is contacted with hot fume in oxygen and furnace Become larger, kindling earlier, after-flame is more thorough, and heat release is more in the case where identical coal dust amount, thus burner hearth bulk temperature level compared with Original operating condition is slightly higher.
(2) it reduces coal powder size and is conducive to after-flame, unburned carbon in flue dust is gradually decreased by operating condition 1 to operating condition 3.Fineness of pulverized coal by 6.0% when being reduced to 3.0%, and unburned carbon in flue dust drops to 8.32% by 13.19%, reduces about 4.87 percentage points.
(3) with the reduction of coal particle size, the NOx concentration of furnace outlet is gradually reduced.Operating condition 2,3 is compared with the furnace under operating condition 1 Thorax exit NOx concentration reduces about 2.9% and 13.7% respectively.
2, process and result are tested
Keep total coal amount, operation oxygen amount, SOFA wind ratio, pulverizer capacity, coal pulverizer ventilation quantity, entrance primary wind pressure etc. It is constant, carry out 3 change dynamic separator frequency operating conditions.
Under boiler for deeply low nitrogen burning state, maintain burnout degree ratio (25%), operation oxygen amount (3.85%-4.06), Coal pulverizer runs constant, the influences by analysis of experiments difference fineness of pulverized coal to boiler combustion such as number of units (ABCD mills).
Boiler thermal efficiency, subsidiary engine power consumption are tested under different operating conditions.The unit method of operation is shown in Table 5.Furnace effect calculates under each operating condition Parameter is shown in Table 6.Econmics comparison is shown in Table 7 under different fineness of pulverized coal.
The 5 330MW load change state separator revolving speed unit method of operation of table
6 330MW load difference separator speed conditions boiler thermal efficiency test result table of table
Project Unit Operating condition 1 Operating condition 2 Operating condition 3
Fineness of pulverized coal R90 % 6.0 4.5 3.2
It tests coal quality (carbon) % 56.19 56.19 56.19
It tests coal quality (hydrogen) % 2.03 2.03 2.03
It tests coal quality (oxygen) % 0.95 0.95 0.95
It tests coal quality (nitrogen) % 0.94 0.94 0.94
It tests coal quality (sulphur) % 3.14 3.14 3.14
It tests coal quality (ash) % 28.85 28.85 28.85
It tests coal quality (moisture content) % 7.90 7.90 7.90
Fugitive constituent (air-dried basis) % 11.24 11.24 11.24
It tests coal quality (Lower heat value) KJ/kg coal 21100 21100 21100
Exhaust gas temperature (after amendment) ℃ 116.30 116.22 115.73
Unburned carbon in flue dust % 11.70 7.80 6.51
Boiler slag carbon content % 1.63 1.50 1.03
Boiler thermal efficiency % 85.96 88.85 89.54
7 330MW load of table becomes econmics comparison under each operating condition of fineness of pulverized coal
3, best fineness of pulverized coal is determined
330MW load, burnout degree ratio 25% or so, unit depth low nitrogen burning mode it can be seen from table 5- table 7 Under, change fineness of pulverized coal, is found by experiment that more apparent to combustion effects.
(a) unburned carbon in flue dust is reduced to 6.51% by 11.7%, and variation is obvious, reduces about 5.21 percentage points.Smoke evacuation temperature Degree variation is unobvious, and boiler efficiency improves 3.58 percentage points, and influencing coal consumption reduces about 12.17g/ (KWh).
(b) spray water flux is in decreasing trend.Overheat cooling water reduces 18t/h.
(c) after fineness of pulverized coal reduces by 2.8 percentage points, coal pulverizer consumption, blower electricity are increased to by 14517kW.h 14625kW.h increases 108kW.h, amplification 0.75%.
(d) after fineness of pulverized coal reduces by 2.8 percentage points, economizer exit nitrous oxides concentration reduces about 175mg/Nm3, drop Width is up to 18.6%.
It is found by experiment that, under 330MW load, the flying dust slag phosphorus content of numerical simulation under different fineness of pulverized coal operating conditions, Economizer exit nitrous oxides concentration and full size field test result are not much different, and illustrate that numerical simulation is more accurate.Coal dust is thin When degree R90 drops to 3.2% by 6%, flying dust, slag phosphorus content reduce more, 3.58 percentage points of boiler efficiency raising, nitrogen Oxide reduces, overheats spray water flux reduction, and unit economy and the feature of environmental protection significantly improve.
When fineness of pulverized coal R90 is reduced to 3.2%, fineness of pulverized coal reduces more, discovery coal pulverizer differential pressure during test Bigger, there is also risks for coal pulverizer safe and stable operation, and when fineness of pulverized coal is reduced to 3.2%, coal dust firing more shifts to an earlier date, and there is burning Damage the risk of burner nozzle.Comprehensive analysis, burn meager coal when, fineness of pulverized coal R90 selection 3% or so relatively rationally.
Embodiment 2 (260MW load)
The coal pulverizer that the present embodiment specifically puts into operation is ABCD4 platform coal pulverizer.
W type flame combustion mode boiler of the present invention uses meager coal fineness of pulverized coal control method, and specific step is as follows:
(1) it under boiler low nitrogen burning state, maintains unit load 265MW load constant, maintains burnout degree ratio (25%), it is constant that oxygen amount (4.38%-4.46%), coal pulverizer operation number of units (ABCD mill) etc. are run, passes through numerical simulation analysis Influence of the different fineness of pulverized coal to boiler combustion.With FLUENT numerical simulation software suggestion mode, grid dividing, carry out coal dust Fineness R90 is respectively 6%, 4.5% and 3% numerical simulation calculation；
(2) field test research is carried out according to the numerical simulation result of the first step, under boiler for deeply low nitrogen burning state, It maintains burnout degree ratio (25%), operation oxygen amount (4.38%-4.46%), coal pulverizer operation number of units (ABCD mill) etc. constant, leads to Overtesting analyzes influence of the different fineness of pulverized coal to boiler combustion.
When 260MW load, A grinds power 30t/h, mill import primary wind pressure 5.0kPa, mill 270 DEG C of import wind-warm syndrome, hot air disperser Aperture 100%, cold-air flap aperture 40%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.0kPa, 3.3kPa, 3.7kPa), A grind ventilation quantity (33t/h, 33t/h, 32.9t/h), A disintegrating outlet temperature (115 DEG C, 114 DEG C, 112 DEG C), fineness of pulverized coal R90 be respectively (6.2%, 4.1%, 3.0%).B grinds power 22t/h, mill import primary wind pressure 5.0kPa, mill 293 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 40%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (2.8kPa, 3.2kPa, 3.5kPa), B mill ventilation quantity (29.6t/h, 29.8t/h, 29.1t/h), B disintegrating outlet temperature (112 DEG C, 111 DEG C, 112 DEG C), fineness of pulverized coal R90 are respectively (5.6%, 4.0%, 3.1%). C grinds power 31t/h, mill import primary wind pressure 5.3kPa, mill 305 DEG C of import wind-warm syndrome, hot air disperser aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer inlet and outlet differential pressure (3.2kPa, 3.5kPa, 3.8kPa), C mill Ventilation quantity (32.8t/h, 33t/h, 31.9t/h), C disintegrating outlet temperature (106 DEG C, 105 DEG C, 106 DEG C), fineness of pulverized coal R90 difference For (6.0%, 3.9%, 2.9%).D grinds power 33t/h, mill import primary wind pressure 5.3kPa, mill 305 DEG C of import wind-warm syndrome, hot wind Door aperture 100%, cold-air flap aperture 0%, dynamic separator frequency (40Hz, 45Hz, 50Hz), coal pulverizer import and export differential pressure (3.4kPa3.7kPa, 4.0kPa), D grind ventilation quantity (32.8t/h, 33t/h, 34t/h), D disintegrating outlet temperature (100 DEG C, 102 DEG C, 102 DEG C), fineness of pulverized coal R90 be respectively (5.9%, 3.9%, 3.1%).
(3) numerical simulation and experimental study are combined, when W type flame combustion mode boiler low nitrogen burning state uses meager coal coal Powder fineness (R90) Optimal Control value is 3% or so.
1, numerical simulation analysis process and result
Under 260MW load, consider under boiler for deeply nitrogen combustion state, burnout degree ratio about 25%, Secondary Air is maintained to match Wind mode, operation oxygen amount, coal pulverizer operation number of units etc. are constant, change fineness of pulverized coal (R90Respectively 6%, 4.5% and 3%), Middle fineness of pulverized coal 6% is calculated according to " pulverized coal preparation system design calculates directive/guide " -2012 editions recommendation calculation formula.Analyze coal dust Fineness changes the influence to burning.Numerical simulation operating condition is shown in Table 8.Analog result is shown in Table 9, Fig. 7-Figure 11.
Different fineness of pulverized coal numerical simulation operating conditions under 8 260MW of table
Operating condition Operating condition 4 Operating condition 5 Operating condition 6
Operating condition explanation α=1.27 α=1.27 α=1.27
Operating condition explanation Fine powder 6 Fine powder 4.5 Fine powder 3
R90=6.00% R90=4.50% R90=3.00%
SOFA wind ratio 25% 25% 25%
Different fineness of pulverized coal numerical simulation results under 9 260MW of table
260MW load, burnout degree ratio 25% or so, the low nitrogen of unit depth it can be seen from table 8- table 9, Fig. 7-Figure 11 Under combustion system, it is more apparent to combustion effects to change fineness of pulverized coal.
(1) reduction to attenuate with coal dust, the specific surface area that the coal dust of unit mass is contacted with hot fume in oxygen and furnace Become larger, kindling earlier, after-flame is more thorough, and heat release is more in the case where identical coal dust amount, thus burner hearth bulk temperature level compared with Original operating condition is slightly higher.
(2) it reduces coal powder size and is conducive to after-flame, unburned carbon in flue dust is gradually decreased by operating condition 4 to operating condition 6.Fineness of pulverized coal by 5.9% when being reduced to 3.0%, and unburned carbon in flue dust drops to 6.14% by 10.17%, reduces about 4 percentage points, coal consumption reduces about 8g/kW.h。
(3) with the reduction of coal particle size, the NOx concentration of furnace outlet is gradually reduced.Operating condition 5,6 is compared with the furnace under operating condition 4 Thorax exit NOx concentration reduces about 2.4% and 14.5% respectively.
Station boiler when depth low nitrogen burning state, using meager coal, the variation of fineness of pulverized coal to boiler flyash carbon content, Economizer exit NOXConcentration, fire box temperature field and burner hearth CO concentration influence more apparent.When fineness of pulverized coal drops to 3% by 6%, Unburned carbon in flue dust reduces by 4 percentage points, economizer exit NOXConcentration decline about 14.5%.Station boiler depth low nitrogen burning shape State, when using meager coal, it is best in order to reach unit economy and the feature of environmental protection, under the premise of pulverized coal preparation system operational safety is allowed to the greatest extent Amount reduces fineness of pulverized coal operation.It is true by numerical simulation in order to guarantee pulverized coal preparation system long-term safety and burner nozzle safety It is preferable 3% or so to determine fineness of pulverized coal R90 control when W type flame combustion boiler uses meager coal
2, experimental study process and result
Keep total coal amount, operation oxygen amount, SOFA wind ratio, pulverizer capacity, coal pulverizer ventilation quantity, entrance primary wind pressure etc. It is constant, carry out 3 change dynamic separator frequency operating conditions.
Boiler thermal efficiency, subsidiary engine power consumption are tested under different operating conditions.The unit method of operation is shown in Table 10.Furnace effect calculates under each operating condition Parameter is shown in Table 11.Economic analysis is shown in Table 11.
The 10 260MW load change state separator revolving speed unit method of operation of table
11 260MW load difference separator speed conditions boiler thermal efficiency test result table of table
Project Unit Operating condition 4 Operating condition 5 Operating condition 6
Fineness of pulverized coal R90 % 6.1 4.8 2.9
It tests coal quality (carbon) % 56.19 56.19 56.19
It tests coal quality (hydrogen) % 2.03 2.03 2.03
It tests coal quality (oxygen) % 0.95 0.95 0.95
It tests coal quality (nitrogen) % 0.94 0.94 0.94
It tests coal quality (sulphur) % 3.14 3.14 3.14
It tests coal quality (ash) % 28.85 28.85 28.85
It tests coal quality (moisture content) % 7.90 7.90 7.90
Fugitive constituent (air-dried basis) % 11.24 11.24 11.24
It tests coal quality (Lower heat value) KJ/kg coal 21100 21100 21100
Exhaust gas temperature (after amendment) ℃ 115.60 115.07 115.93
Unburned carbon in flue dust % 11.30 7.51 6.33
Boiler slag carbon content % 2.13 2.10 1.53
Boiler thermal efficiency % 85.73 88.62 89.24
12 260MW load of table becomes econmics comparison under each operating condition of fineness of pulverized coal
3, best fineness of pulverized coal is determined
260MW load, burnout degree ratio 25% or so, unit depth low nitrogen burning mode it can be seen from table 10- table 12 Under, change fineness of pulverized coal, is found by experiment that more apparent to combustion effects.
(a) when fineness of pulverized coal is reduced to 2.9% by 6.1%, unburned carbon in flue dust is reduced to 6.33% by 11.3%, changes bright It is aobvious, reduce about 5 percentage points.Exhaust gas temperature variation is unobvious, and boiler efficiency improves 3.51 percentage points, and influencing coal consumption reduces about 11.94g/(KW·h)。
(b) spray water flux is in decreasing trend.Overheat cooling water reduces 14t/h.
(c) after fineness of pulverized coal reduces by 2.2 percentage points, coal pulverizer consumption, blower electricity are increased to by 13811kW.h 13811kW.h, increases 100kW.h, and amplification is up to 0.72%.
(d) after fineness of pulverized coal reduces by 2.2 percentage points, economizer exit nitrous oxides concentration reduces about 117mg/Nm3, drop Width is up to 13.9%.
It is found by experiment that, under 260MW load, the flying dust slag phosphorus content of numerical simulation under different fineness of pulverized coal operating conditions, Economizer exit nitrous oxides concentration and full size field test result are not much different, and illustrate that numerical simulation is more accurate.Coal dust is thin When degree R90 drops to 3% by 6%, flying dust, slag phosphorus content reduce more, 3.63 percentage points of boiler efficiency raising, nitrogen oxygen Compound reduces, overheats spray water flux reduction, and unit economy and the feature of environmental protection significantly improve.
Fineness of pulverized coal reduction is more, and discovery coal pulverizer differential pressure is also bigger during test, coal pulverizer safe and stable operation There are risks, and when fineness of pulverized coal is reduced to 3%, coal dust firing more shifts to an earlier date, and there are the risks of scaling loss burner nozzle.Comprehensive point Analysis, burn meager coal when, fineness of pulverized coal R90 selection 3% or so relatively rationally.

Claims (6)

1. the method for controlling combustion that a kind of W type flame combustion mode boiler uses meager coal, which is characterized in that the method for controlling combustion By adjusting to coal pulverizer operation method, control fineness of pulverized coal R90 is 2.9-6.1%.
2. method for controlling combustion according to claim 1, which is characterized in that the fineness of pulverized coal R90 control is 3.0%- 6.0%。
3. method for controlling combustion according to claim 2, which is characterized in that the fineness of pulverized coal R90 control is 3.0%- 3.2%。
4. method for controlling combustion according to claim 2, which is characterized in that the method for controlling combustion includes following step It is rapid:
(1) it under boiler low nitrogen burning state, maintains unit load constant, maintains burnout degree ratio, operation oxygen amount, coal pulverizer fortune Row number of units is constant；
(2) as follows to tetra- coal mill controls of ABCD when unit load is 330MW:
A grinds power 40t/h, mill import primary wind pressure 5.3kPa, 294 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 3.3kPa-4.4kPa, A mill ventilation quantity are 45.8t/h-46t/h, A disintegrating outlet temperature are 100 DEG C -102 DEG C；
B grinds power 27t/h, mill import primary wind pressure 5.3kPa, 292 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 4.0kPa-4.6kPa, B mill ventilation quantity are 40.5t/h-41.1t/h, B disintegrating outlet temperature be 101 DEG C -102 DEG C；
C grinds power 37t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 3.7kPa-4.6kPa, C mill ventilation quantity are 35.8t/h-36t/h, C disintegrating outlet temperature are 105 DEG C -106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 3.7kPa-4.3kPa, D mill ventilation quantity are 37.8t/h-39t/h, D disintegrating outlet temperature are 99 DEG C -100 DEG C；
It is as follows to tetra- coal mill controls of ABCD when unit load is 260MW:
A grinds power 30t/h, mill import primary wind pressure 5.0kPa, 270 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 40%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 2.8kPa-3.3kPa, A mill ventilation quantity are 32.9t/h-33t/h, A disintegrating outlet temperature are 112 DEG C -115 DEG C；
B grinds power 22t/h, mill import primary wind pressure 5.0kPa, 293 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 40%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 2.8kPa-3.5kPa, B mill ventilation quantity are 29.1t/h-29.8t/h, B disintegrating outlet temperature be 111 DEG C -112 DEG C；
C grinds power 31t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 3.2kPa-3.8kPa, C mill ventilation quantity are 31.9t/h-33t/h, C disintegrating outlet temperature are 105 DEG C -106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 40Hz-50Hz, coal pulverizer inlet and outlet differential pressure is that 3.4kPa-4.0kPa, D mill ventilation quantity are 32.8t/h-34t/h, D disintegrating outlet temperature are 100 DEG C -102 DEG C.
5. method for controlling combustion according to claim 4, which is characterized in that in boiler low nitrogen burning in the step (1) It under state, maintains unit load 330MW or 260MW constant, maintains burnout degree ratio 25% constant, when unit load is 330MW Operation oxygen amount maintains 3.85%-4.06%, and when unit load is 260MW, operation oxygen amount maintains 4.38%-4.46%.
6. method for controlling combustion according to claim 5, which is characterized in that tetra- coal-grindings of ABCD in the step (2) The control method of machine is as follows:
When unit load is 330MW,
A grinds power 40t/h, mill import primary wind pressure 5.3kPa, 294 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.4kPa, A mill ventilation quantity are 45.9t/h, A disintegrating outlet Temperature is 102 DEG C；
B grinds power 27t/h, mill import primary wind pressure 5.3kPa, 292 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.6kPa, B mill ventilation quantity are 41.1t/h, B disintegrating outlet Temperature is 102 DEG C；
C grinds power 37t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.6kPa, C mill ventilation quantity are 35.9t/h, C disintegrating outlet Temperature is 106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 295 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.3kPa, D mill ventilation quantity are 39t/h, D disintegrating outlet temperature Degree is 99 DEG C；
When unit load is 260MW,
A grinds power 30t/h, mill import primary wind pressure 5.0kPa, 270 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 40%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 3.3kPa, A mill ventilation quantity are that 32.9t/h, A are ground Mouth temperature is 112 DEG C；
B grinds power 22t/h, mill import primary wind pressure 5.0kPa, 293 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 40%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 3.5kPa, B mill ventilation quantity are that 29.1t/h, B are ground Mouth temperature is 112 DEG C；
C grinds power 31t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency be 50Hz, coal pulverizer inlet and outlet differential pressure be 3.8kPa, C mill ventilation quantity be 31.9, C disintegrating outlet temperature Degree is 106 DEG C；
D grinds power 33t/h, mill import primary wind pressure 5.3kPa, 305 DEG C of import wind-warm syndrome of mill, hot air disperser aperture 100%, cold-air flap and opens Degree 0%, dynamic separator frequency are 50Hz, coal pulverizer inlet and outlet differential pressure is that 4.0kPa, D mill ventilation quantity are 34t/h, D disintegrating outlet temperature Degree is 102 DEG C.
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