CN106801887A - A kind of anti-interference energy-saving fired power generating unit powder control system - Google Patents
A kind of anti-interference energy-saving fired power generating unit powder control system Download PDFInfo
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- CN106801887A CN106801887A CN201710084698.3A CN201710084698A CN106801887A CN 106801887 A CN106801887 A CN 106801887A CN 201710084698 A CN201710084698 A CN 201710084698A CN 106801887 A CN106801887 A CN 106801887A
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- 239000000843 powder Substances 0.000 title claims abstract description 45
- 239000000446 fuel Substances 0.000 claims abstract description 127
- 239000003245 coal Substances 0.000 claims abstract description 122
- 238000012937 correction Methods 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 16
- 230000006641 stabilisation Effects 0.000 claims abstract description 9
- 238000011105 stabilization Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims description 20
- 238000009530 blood pressure measurement Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 claims description 5
- 230000004044 response Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 claims description 2
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 238000000227 grinding Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K1/00—Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
- F23K3/02—Pneumatic feeding arrangements, i.e. by air blast
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- 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
- F23N1/025—Regulating fuel supply conjointly with air supply using electrical or electromechanical means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2201/00—Pretreatment of solid fuel
- F23K2201/10—Pulverizing
- F23K2201/1006—Mills adapted for use with furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2203/00—Feeding arrangements
- F23K2203/20—Feeding/conveying devices
- F23K2203/201—Feeding/conveying devices using pneumatic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2900/00—Special features of, or arrangements for fuel supplies
- F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The present invention provides a kind of anti-interference energy-saving fired power generating unit powder control system, including：Many feeders, many coal pulverizers, two primary air fans, fuel adjustment unit and blast adjustment units.Counting module, judge module in fuel adjustment unit are responsible for monitoring coal pulverizer running status, once monitor that coal pulverizer starts or stoppage in transit signal starts this control system immediately, by quick adjustment fuel command after fuel measurement module, main vapour pressure, fuel correction module, fuel output module computing, maintain the stabilization of burner hearth fuel quantity, primary air pressure is adjusted rapidly by the blast correction module in blast adjustment unit, instruction module, adjusting module simultaneously, the Dynamic Matching relation of coal pulverizer average output and primary air pressure is kept.The present invention solves the technical barrier of unit major parameter fluctuation during Coal pulverizer, reduces the energy consumption of primary air fan, and powder control system processed can be prevented to block, and unit safety performance, stability and energy-saving index are improve comprehensively.
Description
Technical field
The invention belongs to fired power generating unit automatic control technology field, it is related to a kind of fired power generating unit powder control system anti-interference
A kind of research in terms of ability, set steady and energy-conservation, and in particular to anti-interference energy-saving fired power generating unit powder control system
System.
Background technology
The need for Large-scale fire-electricity unit is in order to meet power network AGC depth peak regulations, unit load is in 50%Pe~100%Pe models
Changed repeatedly in enclosing, the coal pulverizer running status of blowing powder producing control system will follow unit load regularly to change, and be
Guarantee unit AGC regulation qualities, it is necessary to design a set of rational powder control system processed, including：Fuel Control System and once
Wind pressure control system.
Conventional Fuel Control System is to maintain the total fuel quantity equilibrium of supply and demand of unit, and total fuel command is distributed into separate unit
Feeder, is allowed to equal with feeder coal quantity sensor measured value；Conventional primary air pressure control system is according to boiler oil
Corresponding primary air pressure characteristic curve is instructed, the stabilization of First air main-piping pressure is maintained by blast adjustment unit.Above-mentioned routine
Powder control system processed many technical problems are exposed during Coal pulverizer, have influence on unit security performance,
Stability and energy-saving index.
In coal pulverizer start-up course when powder passage processed is opened, there are following three kinds of situations.
(1) coal dust stored in the new coal pulverizer mill bowl for starting is blown into rapidly burner hearth, and the part of fuel amount does not possess prison
Survey means, the total fuel quantity of the uncontrollable unit of Fuel Control System causes effective fuel quantity of burner hearth to be significantly increased.
(2) the new coal pulverizer for starting causes First air main-piping pressure to decline rapidly, First air to ensure minimum ventilation rate
Pressure control system will be automatically increased exerting oneself for primary air fan, and the First air total flow into burner hearth will be significantly increased.
(3) synchronously increase under double action in the effective fuel quantity of burner hearth and First air total flow, necessarily aggravate boiler combustion
Rate, causes the major parameter rapid increase such as main vapour pressure and Stream temperature degree.
During coal pulverizer stoppage in transit when powder passage processed cuts off, there are following four kinds of situations.
(1) the new coal pulverizer fuel quantity stopped transport is mutated to 0 by minimum coal amount, and the newly-increased fuel quantity of Fuel Control System has
Certain time-delay characteristics can not in time fill up the breach of fuel, cause effective fuel quantity of burner hearth drastically to reduce.
(2) the average output increase of operation coal pulverizer, the demand increase of coal pulverizer inlet primary air flow.
(3) First air main-piping pressure steeply rises, and primary air pressure control system reduces exerting oneself for primary air fan by automatic, enters
The First air total flow for entering burner hearth will be greatly reduced, and operation coal pulverizer inlet primary air flow quantity delivered deficiency causes powder control system processed
System is blocked.
(4) synchronously reduce under double action in the effective fuel quantity of burner hearth and First air total flow, it is inevitable significantly to weaken boiler
Combustion rate, causes the major parameter rapid decrease such as main vapour pressure and Stream temperature degree.
In sum, there is both sides defect in existing powder control system processed：First, can not during Coal pulverizer
The stabilization of burner hearth fuel quantity and First air total flow is maintained, triggers unit major parameter fluctuation, it is impossible to meet power network AGC tune
The need for peak；Second, First air main-piping pressure characteristic curve is unreasonable, it is impossible to keep coal pulverizer average output with primary air pressure
Dynamic Matching relation, easily causes powder control system processed and blocks and unit energy loss.
At present, there is patent document to mention primary air pressure self-adapting intelligent to control, the document is to be related to powder control system processed
Adjustment means after system disturbance generation, system response promptness is not enough；Also patent document mentions primary air pressure automatic seeking major clique
System, the total blast volume that the document is mentioned according to required for the aperture and coal pulverizer of coal pulverizer inlet air door is female come adjust automatically First air
, due to not knowing for the throttle opening linearity, there is many uncertain factors in implementation process in pipe pressure.
For large-scale thermal power machine group, work out a kind of new powder control system processed, can effectively solve the problem that because
Pulverized coal preparation system internal disturbance and trigger the problem of unit major parameter fluctuation, improve set steady performance, prevent powder control processed
System jams processed, reduce primary air fan power consumption, improve unit energy-saving index.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and provide a kind of anti-interference energy-saving
Fired power generating unit powder control system, can effectively solve the problem that the problem of unit major parameter fluctuation during Coal pulverizer,
Unit safety stability and unit energy-saving index are improved simultaneously.
The present invention the used technical scheme that solves the above problems is：The anti-interference energy-saving fired power generating unit powder control
The characteristics of system is：Including：
Many feeders, for adjusting the total fuel quantity of unit；
Many coal pulverizers, for conveying qualified coal dust for burner hearth；
Two primary air fans, for adjusting the ability that powder control system processed carries coal dust；
Fuel adjustment unit, the stabilization for maintaining coal pulverizer startup and stoppage in transit operating mode burner hearth fuel quantity；
Blast adjustment unit, the Dynamic Matching relation for keeping coal pulverizer average output and First air main-piping pressure.
Preferably, fuel adjustment unit of the present invention includes：
Counting module, for storing coal pulverizer operation quantity；
Judge module, for according to counting module output result, real-time monitoring coal pulverizer running status, and judges " opening mill "
Or " stopping mill " operating mode；
Computing module, for according to judge module output result, calculating " opening mill " and " stopping mill " operating mode fuel adjustment amount；
Fuel measurement module, for measuring many feeder coal amounts and calculating total amount of fuel, as fuel correction module
One of correction factor；
Fuel correction module, for the output of associative operation module, the output of fuel measurement module and main vapour pressure rate of change certainly
Dynamic correction fuel adjustment amount, precise control fuel adjustment amount；
Fuel output module, for receiving fuel correction module output signal, is superimposed unit ioad fuel function, forms machine
The total fuel command of group, and many feeders are distributed to while adjusting total fuel quantity.
Preferably, blast adjustment unit of the present invention includes：
Blast correction module, the need for quick response " opening mill " and " stopping mill " operating mode primary air pressure dynamically adjustment, guarantor
Hold the Dynamic Matching relation of coal pulverizer average output and primary air pressure；
Instruction module, for exporting primary air pressure characteristic curve corresponding with total fuel command according to blast correction module,
Form final blast control instruction；
Wind pressure measurement module, measures and processes for primary air pressure, realizes three tunnel measurement signal " during three take " logic functions,
And automatic detection bad quality signals, " blast adjustment unit " automatic control mode is exited when all signals are insincere, while
Send alarm signal；
Adjusting module, the output of output and wind pressure measurement module for combined command module, realizes that primary air pressure is automatic
Control, with ratio and integrating function；
Blast output module, exerts oneself for two primary air fans of autobalance, prevents unilateral primary air fan output defeat, goes out
Existing " tacking " phenomenon.
Preferably, in fuel adjustment unit of the present invention, " coal pulverizer operation " signal of the counting module be by
The knot of coal pulverizer current value, coal pulverizer inlet hot blast control valve opening and coal pulverizer electric switch circuit-closing contacts comprehensive descision
Really.
Preferably, in fuel adjustment unit of the present invention, the judge module is selected by specific differentiation element, low value
Select device and value selector high composition.
Preferably, in fuel adjustment unit of the present invention, the computing module is by multiple constants and two-stage analog quantity
Switch is collectively formed, and by setting different switching rates to analog quantity switch, realization is quick in advance to coal and slow recovery
Function.
Preferably, in fuel adjustment unit of the present invention, the fuel correction module introduce total fuel quantity correction because
Son, realizes that fuel adjustment amount follows boiler heat load zero offset capability；Main vapour pressure change rate correction factor is introduced, is realized fast
Speed suppresses the function of main vapour pressure fluctuation.
Preferably, in blast adjustment unit of the present invention, the blast correction module is by function generator and biasing
Manual operator is constituted, and function generator input quantity is the coal pulverizer operation quantity of counting module output；Biasing manual operator provides fortune
Administrative staff intervenes the means of primary air pressure setting value manually.
The present invention compared with prior art, with advantages below and effect：With strong antijamming capability, anti-powder control system processed
System blocks, energy-saving and the advantages of be easy to implement.
Control method basic ideas of the present invention are as follows：According to coal pulverizer electric current, coal pulverizer inlet hot blast control valve opening and
Coal pulverizer electric switch contact state, comprehensive descision goes out coal pulverizer running status, and counting coal pulverizer by counting module runs
Quantity, is as a result connected to fuel adjustment unit and blast adjustment unit.Judge module monitors coal-grinding according to the output of counting module
Machine running status, judges " opening mill " or " stopping mill " operating mode, once monitoring that coal pulverizer starts or stoppage in transit signal, computing is triggered immediately
Module sends fuel adjust instruction, realizes quickly in advance to coal and the slow adjustment function of recovering, and draw in fuel correction module
Enter total amount of fuel and main vapour pressure correction factor, accurately control fuel adjustment amount, maintain the stabilization of burner hearth total amount of fuel, prevention
Unit major parameter fluctuation.Blast correction module count pick up module output signal, under " opening mill " and " stopping mill " operating mode
It is automatic to send blast adjust instruction, the corresponding primary air pressure characteristic curve of total fuel command is corrected, keep coal pulverizer average output
With the Dynamic Matching relation of First air main-piping pressure, it is to avoid blocking and high-drag operating condition occurs in powder control system processed, reduces
Primary air fan power consumption, improves unit energy-saving index.
Brief description of the drawings
Fig. 1 is a kind of anti-interference energy-saving fired power generating unit powder control system schematic flow sheet.
Fig. 2 is a kind of anti-interference energy-saving fired power generating unit powder control system hardware configuration schematic diagram.
Fig. 3 is a kind of anti-interference energy-saving fired power generating unit powder control system configuration schematic diagram.
Fig. 4 is a kind of anti-interference energy-saving fired power generating unit powder control system load up process design sketch.
Fig. 5 is a kind of anti-interference energy-saving fired power generating unit powder control system load down process design sketch.
Fig. 6 is that a kind of anti-interference energy-saving fired power generating unit powder control system opens grinder condition unit major parameter change song
Line chart.
Fig. 7 is a kind of anti-interference energy-saving fired power generating unit powder control system start and stop grinder condition unit major parameter change
Curve map.
In Fig. 1：1-A sides primary air fan, 2-B sides primary air fan, 14-A feeders, 15-A coal pulverizers, 16-F feeders,
17-F coal pulverizers, 70- counting modules, 71- judge modules, 72- fuel adjustment amounts computing module, the change of 73- units main vapour pressure
Rate signal, 74- fuel measurements module, 75- fuel corrections module, 76- fuel output module, 80- blast correction module, 81- machines
The total fuel command module of group, 82- blast instruction module, 83- wind pressure measurements module, 84- blast adjusting module, the output of 85- blast
Module.
In Fig. 2：1-A sides primary air fan, 2-B sides primary air fan, 3- blast adjustment unit, 4-A sides First air main-piping pressure
Regulating valve, 5-B sides First air main-piping pressures regulating valve, 6-A coal pulverizer inlet hot blasts regulating valve, 7-F coal pulverizer inlets hot blast are adjusted
Section valve, 8- primary air pressure main-piping pressures transmitter, 9- primary air pressure main-piping pressures transmitter, 10- primary air pressures main-piping pressure become
Send device, 11- wind pressure measurements passage, 12-A coal pulverizer inlet First airs flow transmitter, wind flow of 13-F coal pulverizer inlets
Transmitter, 14-A feeders, 15-A coal pulverizers, 16-F feeders, 17-F coal pulverizers, 18-A coal-supplying amounts, 19-F coal-supplying amounts, 20-A
Coal pulverizer outlet fuel amount, 21-A coal pulverizer electric switches signal, 22-A coal pulverizers current signal, 23-F coal pulverizer outlet fuels
Amount, 24-F coal pulverizer electric switches signal, 25-F coal pulverizers current signal, 26- boiler furnaces.
In Fig. 3：31- switches batching counter, 32- switches batching counter, 33- adders, 34- first order inertial loops, 35- subtract
Musical instruments used in a Buddhist or Taoist mass, 36- constants, 37- low value selectors, 38- value selectors high, 39- constants, 40- constants, 41- analog quantitys switch, 42-
Constant, 43- analog quantitys switch, 44- function generators, 45- rate calculators, 46- function generators, 47- multipliers, 48-
Multiplier, 49- analog quantitys selector, 50- first order inertial loops, 51- biasings manual operator, 52- first order inertial loops, 53- functions
Generator, 54- first order inertial loops, 55- function generators, 56- adders, 57-PID adjusters, 58- hands/automatic control station.
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings and by embodiment, and following examples are to this hair
Bright explanation and the invention is not limited in following examples.
Embodiment.
Referring to Fig. 1 to Fig. 7, a kind of anti-interference energy-saving fired power generating unit powder control system, its flow in the present embodiment
As shown in figure 1, including many feeders, many coal pulverizers, two primary air fans, fuel adjustment unit and blast adjustment units,
Blast adjustment unit and primary air fan are connected, and primary air fan and coal pulverizer are connected, and coal pulverizer and boiler furnace are connected, fuel adjustment
Unit and feeder are connected, and feeder and coal pulverizer are connected, and fuel adjustment unit and blast adjustment unit are connected.Fuel adjustment is single
Unit includes：Counting module 70, judge module 71, fuel adjustment amount computing module 72, unit main vapour pressure rate of change signal 73, combustion
Material measurement module 74, fuel correction module 75 and fuel output module 76, blast adjustment unit include：Blast correction module 80,
The total fuel command module 81 of unit, blast instruction module 82, wind pressure measurement module 83, blast adjusting module 84 and blast output mould
Block 85.Many feeders include A feeders 14 and F feeders 16, and many coal pulverizers include A coal pulverizers 15 and F coal pulverizers 17, two
Platform primary air fan is A sides primary air fan 1 and B sides primary air fan 2.
The present embodiment hardware configuration as shown in Fig. 2 including：A sides primary air fan 1, B sides primary air fan 2, blast adjustment unit
3rd, A sides First air main-piping pressure regulating valve 4, B sides First air main-piping pressure regulating valve 5, A coal pulverizer inlet hot blast regulating valves 6, F
Coal pulverizer inlet hot blast regulating valve 7, primary air pressure main-piping pressure transmitter 8, primary air pressure main-piping pressure transmitter 9, First air
Pressure main-piping pressure transmitter 10, wind pressure measurement passage 11, A coal pulverizer inlet First airs flow transmitter 12, F coal pulverizer inlets one
Secondary distinguished and admirable transmitter 13, A feeders 14, A coal pulverizers 15, F feeders 16, F coal pulverizers 17, A coal-supplying amounts 18, F coal-supplying amounts 19,
A coal pulverizer outlet fuels amount 20, A coal pulverizer electric switches signal 21, A coal pulverizers current signal 22, F coal pulverizer outlet fuel amounts
23rd, F coal pulverizers electric switch signal 24, F coal pulverizers current signal 25, boiler furnace 26.
The present embodiment logic content as shown in figure 3, including：Switch batching counter 31, switch batching counter 32, adder
33rd, first order inertial loop 34, subtracter 35, constant 36, low value selector 37, value selector high 38, constant 39, constant 40, mould
Analog quantity switch 41, constant 42, analog quantity switch 43, function generator 44, rate calculator 45, function generator 46, multiply
Musical instruments used in a Buddhist or Taoist mass 47, multiplier 48, analog quantity selector 49, first order inertial loop 50, biasing manual operator 51, first order inertial loop 52, letter
Number generator 53, first order inertial loop 54, function generator 55, adder 56, PID regulator 57, hand/automatic control station 58.
The present embodiment application effect figure as shown in Figure 4 to 7, including：A kind of anti-interference energy-saving fired power generating unit powder
Control system load up process design sketch, a kind of anti-interference energy-saving fired power generating unit powder control system load down process effect
Figure, a kind of anti-interference energy-saving fired power generating unit powder control system open grinder condition unit major parameter change curve, one kind
Anti-interference energy-saving fired power generating unit powder control system stops grinder condition unit major parameter change curve.
The data statistics of the present embodiment application effect as shown in 5~table of table 7, including：Open the change of grinder condition unit major parameter
Amplitude summary sheet, stop grinder condition unit major parameter change amplitude summary sheet, energy-saving effect tables of data.
(1) counting module：
Counting module 70 is used to store coal pulverizer operation quantity, by the aperture of A coal pulverizer inlet hot blasts regulating valve 6, F coal pulverizers
The aperture of entrance hot blast regulating valve 7, A coal pulverizer electric switches signal 21, A coal pulverizers current signal 22, F coal pulverizers electric switch letter
Numbers 24, F coal pulverizers current signal 25, switch batching counter 31, switch batching counter 32 and adder 33 are constituted.(B~E coal-grindings
Machine identical signal also assists in the logical operation of counting module 70)
By taking A coal pulverizers 15 as an example, it is worth when the aperture of A coal pulverizer inlet hot blasts regulating valve 6, A coal pulverizers current signal 22, A mills
The state three of coal electrical-mechanical switching signal 21 fits like a glove with the practical operation situation of A coal pulverizers 15, that is, judge that " A coal pulverizers 15 are transported
Row signal " is effectively.Coal pulverizer run signal realizes D/A translation functions by switch batching counter 31 and switch batching counter 32,
And send into adder 33 and sue for peace, unit coal pulverizer operation quantity is calculated, result of calculation is connected to fuel adjustment unit and blast
Adjustment unit.
(2) judge module：
Judge module 71 is used for the output result according to counting module 70, real-time monitoring coal pulverizer running status, and judges
" opening mill " or " stopping mill " operating mode, by first order inertial loop 34, subtracter 35, constant 36, low value selector 37, value selector high 38
Composition.
The output signal of counting module 70 constitutes special differential ring by first order inertial loop 34 and the computing of subtracter 35
Section.When micro component exports negative value, " stopping mill " signal is drawn by the logical operation of low value selector 37；When micro component output on the occasion of,
" opening mill " signal is drawn by the logical operation of value selector high 38.The filtering time of first order inertial loop 34 is set to 3s, and constant 36 sets
It is 0.
(3) computing module：
Fuel adjustment amount computing module 72 is used for the output according to judge module 71, calculates " opening mill " and " stopping mill " operating mode
Fuel adjustment amount, maintains the stabilization of the fuel quantity of burner hearth 26, by constant 39, constant 40, analog quantity switch 41, constant 42 and simulation
Amount switch 43 is constituted.
Different switching rates are set to analog quantity switch 41 and analog quantity switch 43, can be realized quick in advance to coal
And the function of slowly recovering.Total fuel adjustment amount is -8t/h under " opening mill " operating mode, and speed is per second kind of 1t/h；" stopping mill " operating mode
Total fuel adjustment amount is 10t/h down, and speed is per second kind of 1.5t/h.Two kinds of operating mode fuel adjustment amounts can maintain certain hour straight
To " opening mill " or " stop mill " blackout, afterwards according to the rate recovery of 0.01t/h each second to zero.
Constant 39 is set to 0, and constant 40 is set to -5, and constant 42 is set to+8, the switching rate 1 of analog quantity switch 41, speed 2
1,0.01 is set to, the switching rate 1 of analog quantity switch 43, speed 2 are set to 1.5,0.01.
(4) fuel measurement module：
Fuel measurement module 74 is used for many feeder online coal quantity measurements and calculates total amount of fuel, used as fuel correction module 75
One of correction factor, by the coal amount of the A coal-supplying amounts 18 of A feeders 14, the F coal-supplying amounts 19 of F feeders 16 and other feeders
Sensor group into.The coal-supplying amount of coal quantity sensor measurement draws the total fuel quantity of unit by logical operation, and operation result is connected to
The input of function generator 44.
(5) fuel correction module：
Fuel correction module 75 is used to combine output, the output of fuel measurement module 74 of fuel adjustment amount computing module 72
With the automatic correction fuel adjustment amount of unit main vapour pressure rate of change signal 73, fuel quantity of the precise control into boiler furnace 26
(including A coal pulverizer outlet fuels amount 20, F coal pulverizer outlet fuels amount 23 and other coal pulverizer outlet fuel amounts), are sent out by function
Raw device 44, rate calculator 45, function generator 46, multiplier 47 and multiplier 48 are constituted.
Function generator 44 fits fuel fair curve, realizes that fuel adjustment amount follows boiler heat load to correct work(automatically
Energy；Introducing the correction factor of unit main vapour pressure rate of change signal 73 is used for dynamic calibration unit energy balance relations, " opening mill "
Or default fuel adjustment amount has deviation with actual demand amount under " stopping mill " operating mode, rate calculator 45 detects deviation
Afterwards, quickly adjust fuel quantity to ensure the balance of unit energy by pressure change rate modifying factor.
The smoothingtime of rate calculator 45 is set to 60s, and the operation result of multiplier 47 and multiplier 48 is single for fuel is adjusted
First output valve.
(6) fuel output module：
Fuel output module 76, for receiving fuel correction module by signal, the corresponding fuel of superposition unit load instruction refers to
After order, many feeder fuel command distribution tasks are completed.
(7) blast correction module：
The need for blast correction module 80 is used for quick response " opening mill " and the dynamic adjustment of " stopping mill " operating mode primary air pressure, protect
The Dynamic Matching relation of coal pulverizer average output and primary air pressure is held, by biasing manual operator 51, first order inertial loop 54 and function
Generator 55 is constituted.
Biasing manual operator 51 provides the means that operations staff intervenes primary air pressure setting value manually；First order inertial loop 54
For blast setting value smooth change provides guarantee；The coal pulverizer operation that the input quantity of function generator 55 is exported from counting module
Quantity, functional relation is as shown in table 1.
By table 1 it was determined that when there is " opening mill " and " stopping mill " operating mode, blast correction module quickly adjusts primary air pressure and refers to
Order, can maintain the stabilization of " opening mill " operating mode First air total flow, and can prevent the blocking of " stopping grinding " operating mode powder control system,
Effectively maintain coal pulverizer average output and coal pulverizer inlet primary air flow (including wind flow pick-up of A coal pulverizer inlets
Device 12, F coal pulverizer inlet First airs flow transmitter 13 and other coal pulverizer inlet First air flow transmitters) dynamic equilibrium
Relation.
The blast correction module function table of table 1
| Coal pulverizer runs number of units | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| Blast correction instruction (kPa) | 0 | 0 | -0.5 | -0.9 | -1.3 | -1.6 | -1.9 |
(8) instruction module：
Instruction module 82 is used to export primary air pressure characteristic curve corresponding with total fuel command according to blast correction module,
Final blast control instruction is formed, is made up of first order inertial loop 52, function generator 53 and adder 56.
First order inertial loop 52 receives total fuel command and makees smoothing processing, is as a result connected to function generator 53, is formed
The corresponding primary air pressure characteristic curve of total fuel command, constitutes primary air pressure instruction theoretical curve, and functional relation is as shown in table 2,
It is superimposed to form final blast control instruction with the output valve of blast correction module 80.Table 3 and table 4 are respectively " opening mill " and " stopping mill "
Operating mode primary air pressure instructs fair curve.
The primary air pressure of table 2 instructs theoretical curve
Table 3 opens grinder condition primary air pressure instruction fair curve
Table 4 stops grinder condition primary air pressure instruction fair curve
(9) wind pressure measurement module：
Wind pressure measurement module 83 is used for First air main-piping pressure signal measurement and treatment, is become by primary air pressure main-piping pressure
Send device 8, primary air pressure main-piping pressure transmitter 9, primary air pressure main-piping pressure transmitter 10, wind pressure measurement passage 11, analog quantity
Selector 49 and first order inertial loop 50 are constituted.
Wind pressure measurement passage 11 receives three road First air main-piping pressure signals, by being connected to analog quantity choosing after logical operation
Device 49 is selected, three tunnel measurement signal " during three take " logic functions, and automatic detection bad quality signals is realized, when all signals can not
" blast adjustment unit " automatic control mode is will move out during letter, alarm signal is simultaneously emitted by.
The filtering time of first order inertial loop 50 is set to 3s, can be converted into steadily the First air main-piping pressure of fuctuation within a narrow range
Adjustable signal, operation result is connected to the input of PID regulator 57.
(10) adjusting module：
Adjusting module 84, corresponding to the PID regulator 57 in configuration figure, for being surveyed according to blast instruction module 82 and blast
The output valve for measuring module 83 automatically adjusts First air main-piping pressure, with ratio and integrating function.
(11) blast output module：
Blast output module 85, corresponding to the hand/automatic control station 58 in configuration figure, for two First airs of autobalance
Machine is exerted oneself, deviation adjust automatically A sides First air main-piping pressures regulating valve 4 and B sides First air according to two primary air fan electric currents
The biasing of main-piping pressure regulating valve 5, prevents unilateral primary air fan output defeat, " tacking " phenomenon occurs.
(12) implementation result：
A. the disturbance of burner hearth fuel quantity and First air total flow, dimension when the present invention can overcome " opening mill " and " stopping mill " operating mode
Hold the stabilization of each major parameter of unit.As shown in Figure 6, Figure 7, every Con trolling index is referred to application effect in certain power plant of the invention
Table 5 and table 6.By the content of table 5, table 6, Fig. 6 and Fig. 7 it has been confirmed that unit is each main under " opening mill " and " stopping mill " operating mode
State modulator index reaches《DL/T 1210-2013 thermal power plants Automatic Generation Control performance test control of acceptance》(country
Bureau of Energy) superior level.
B. the present invention corrects boiler heat load and First air main-piping pressure under " opening mill " and " stopping mill " operating mode with automatic
Characteristic function, had both reduced First air resistance of ducting during thermic load run at high level, and thermic load low level fortune is improve again
First air during row takes powder ability, it is to avoid pulverized coal preparation system is blocked.Design sketch is shown in Fig. 4, Fig. 5.
C. the present invention significantly reduces primary air fan power consumption, improves unit energy-saving index.The present invention is listed in table 7
The relevant parameter of application case, energy-saving effect of the invention is can be seen that by the contrast with same type units.
Table 5 opens grinder condition unit major parameter change amplitude summary sheet
Table 6 stops grinder condition unit major parameter change amplitude summary sheet
The energy-saving effect tables of data of table 7
Note：Mark ◆ data come from be not used first power plant of the invention；The data of ★ are marked from using of the invention
Second power plant.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components
Claiming etc. can be with difference, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement are substituted using similar mode, without departing from structure of the invention or surmount present claims
Scope defined in book, all should belong to protection scope of the present invention.
Claims (8)
1. a kind of anti-interference energy-saving fired power generating unit powder control system, it is characterised in that：Including：
Many feeders, for adjusting the total fuel quantity of unit；
Many coal pulverizers, for conveying qualified coal dust for burner hearth；
Two primary air fans, for adjusting the ability that powder control system processed carries coal dust；
Fuel adjustment unit, the stabilization for maintaining coal pulverizer startup and stoppage in transit operating mode burner hearth fuel quantity；
Blast adjustment unit, the Dynamic Matching relation for keeping coal pulverizer average output and First air main-piping pressure.
2. anti-interference energy-saving fired power generating unit powder control system according to claim 1, it is characterised in that：The combustion
Material adjustment unit includes：
Counting module, for storing coal pulverizer operation quantity；
Judge module, for according to counting module output result, real-time monitoring coal pulverizer running status, and judge " opening mill " or
" stopping mill " operating mode；
Computing module, for according to judge module output result, calculating " opening mill " and " stopping mill " operating mode fuel adjustment amount；
Fuel measurement module, for measuring many feeder coal amounts and calculating total amount of fuel, as the correction of fuel correction module
One of factor；
Fuel correction module, for the output of associative operation module, the output of fuel measurement module and the automatic school of main vapour pressure rate of change
Positive fuel adjustment amount, precise control fuel adjustment amount；
Fuel output module, for receiving fuel correction module output signal, is superimposed unit ioad fuel function, forms unit total
Fuel command, and many feeders are distributed to while adjusting total fuel quantity.
3. anti-interference energy-saving fired power generating unit powder control system according to claim 1, it is characterised in that：The wind
Pressure adjustment unit includes：
Blast correction module, the need for quick response " opening mill " and " stopping mill " operating mode primary air pressure dynamically adjustment, holding mill
The Dynamic Matching relation of coal machine average output and primary air pressure；
Instruction module, for exporting primary air pressure characteristic curve corresponding with total fuel command according to blast correction module, forms
Final blast control instruction；
Wind pressure measurement module, measures and processes for primary air pressure, realizes three tunnel measurement signal " during three take " logic functions, and certainly
Dynamic detection bad quality signals, " blast adjustment unit " automatic control mode is exited when all signals are insincere, is simultaneously emitted by
Alarm signal；
Adjusting module, the output of output and wind pressure measurement module for combined command module, realizes that primary air pressure is automatically controlled,
With ratio and integrating function；
Blast output module, exerts oneself for two primary air fans of autobalance, prevents unilateral primary air fan output defeat, occurs
" tacking " phenomenon.
4. anti-interference energy-saving fired power generating unit powder control system according to claim 2, it is characterised in that：The combustion
In material adjustment unit, " coal pulverizer operation " signal of the counting module is adjusted by coal pulverizer current value, coal pulverizer inlet hot blast
The result of section valve opening and coal pulverizer electric switch circuit-closing contacts comprehensive descision.
5. anti-interference energy-saving fired power generating unit powder control system according to claim 2, it is characterised in that：The combustion
In material adjustment unit, the judge module is made up of specific differentiation element, low value selector and value selector high.
6. anti-interference energy-saving fired power generating unit powder control system according to claim 2, it is characterised in that：The combustion
In material adjustment unit, the computing module is collectively formed by multiple constants and two-stage analog quantity switch, is cut by analog quantity
Parallel operation sets different switching rates, realizes quick in advance to coal and the slow function of recovering.
7. anti-interference energy-saving fired power generating unit powder control system according to claim 2, it is characterised in that：The combustion
In material adjustment unit, the fuel correction module introduces total fuel quantity correction factor, realizes that fuel adjustment amount follows boiler hot to bear
Lotus zero offset capability；Main vapour pressure change rate correction factor is introduced, the quick function of suppressing main vapour pressure fluctuation is realized.
8. anti-interference energy-saving fired power generating unit powder control system according to claim 3, it is characterised in that：The wind
In pressure adjustment unit, the blast correction module is made up of function generator and biasing manual operator, and function generator input quantity is
The coal pulverizer operation quantity of counting module output；Biasing manual operator intervenes primary air pressure setting value manually there is provided operations staff
Means.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109873455A (en) * | 2017-12-05 | 2019-06-11 | 中国电力科学研究院有限公司 | A kind of energy storage auxiliary fired power generating unit AGC frequency modulation method and system |
| CN111425881A (en) * | 2020-03-30 | 2020-07-17 | 国家能源(山东)工程技术有限公司 | Method and system for reducing disturbance of start and stop of double-inlet and double-outlet coal mill on denitration system |
| CN111486472A (en) * | 2020-03-27 | 2020-08-04 | 扬州第二发电有限责任公司 | Medium-speed mill automatic start-stop control system suitable for deep peak shaving of direct-blowing coal-fired unit |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000297930A (en) * | 1999-04-13 | 2000-10-24 | Babcock Hitachi Kk | Device and method for controlling primary draft fan for pulverized coal combustion boiler |
| US20100326337A1 (en) * | 2008-10-31 | 2010-12-30 | Mitsubishi Heavy Industries, Ltd. | Control device of coal pulverizer |
| CN102600959A (en) * | 2012-04-05 | 2012-07-25 | 甘肃电力科学研究院 | Coordinated control system and coordinated control method for powder milling system of double-entering and double-leaving coal mill |
| AU2009311030B2 (en) * | 2008-10-31 | 2013-01-24 | Mitsubishi Power, Ltd. | Device for controlling coal mill |
| CN104197367A (en) * | 2014-08-04 | 2014-12-10 | 国家电网公司 | Primary air fan RB optimal control method based on mother tube pressure |
| CN105372991A (en) * | 2015-11-25 | 2016-03-02 | 国家电网公司 | Heat supply unit multi-coal mixed combustion condition main steam pressure fluctuation-overcoming control method |
| CN105627344A (en) * | 2014-11-28 | 2016-06-01 | 国家电网公司 | Pulverizing system-based shutdown self-test method and device |
| CN206608973U (en) * | 2017-02-16 | 2017-11-03 | 华电电力科学研究院 | Anti-interference energy-saving fired power generating unit powder control system |
-
2017
- 2017-02-16 CN CN201710084698.3A patent/CN106801887A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000297930A (en) * | 1999-04-13 | 2000-10-24 | Babcock Hitachi Kk | Device and method for controlling primary draft fan for pulverized coal combustion boiler |
| US20100326337A1 (en) * | 2008-10-31 | 2010-12-30 | Mitsubishi Heavy Industries, Ltd. | Control device of coal pulverizer |
| AU2009311030B2 (en) * | 2008-10-31 | 2013-01-24 | Mitsubishi Power, Ltd. | Device for controlling coal mill |
| CN102600959A (en) * | 2012-04-05 | 2012-07-25 | 甘肃电力科学研究院 | Coordinated control system and coordinated control method for powder milling system of double-entering and double-leaving coal mill |
| CN104197367A (en) * | 2014-08-04 | 2014-12-10 | 国家电网公司 | Primary air fan RB optimal control method based on mother tube pressure |
| CN105627344A (en) * | 2014-11-28 | 2016-06-01 | 国家电网公司 | Pulverizing system-based shutdown self-test method and device |
| CN105372991A (en) * | 2015-11-25 | 2016-03-02 | 国家电网公司 | Heat supply unit multi-coal mixed combustion condition main steam pressure fluctuation-overcoming control method |
| CN206608973U (en) * | 2017-02-16 | 2017-11-03 | 华电电力科学研究院 | Anti-interference energy-saving fired power generating unit powder control system |
Non-Patent Citations (1)
| Title |
|---|
| 裴振坤等: "600MW 超临界机组的一次风压力控制优化及调整" * |
Cited By (14)
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|---|---|---|---|---|
| CN109873455A (en) * | 2017-12-05 | 2019-06-11 | 中国电力科学研究院有限公司 | A kind of energy storage auxiliary fired power generating unit AGC frequency modulation method and system |
| CN109873455B (en) * | 2017-12-05 | 2023-11-14 | 中国电力科学研究院有限公司 | AGC frequency modulation method and system for energy storage auxiliary thermal power unit |
| CN111486472A (en) * | 2020-03-27 | 2020-08-04 | 扬州第二发电有限责任公司 | Medium-speed mill automatic start-stop control system suitable for deep peak shaving of direct-blowing coal-fired unit |
| CN111425881B (en) * | 2020-03-30 | 2022-02-22 | 国家能源(山东)工程技术有限公司 | Method and system for reducing disturbance of start and stop of double-inlet and double-outlet coal mill on denitration system |
| CN111425881A (en) * | 2020-03-30 | 2020-07-17 | 国家能源(山东)工程技术有限公司 | Method and system for reducing disturbance of start and stop of double-inlet and double-outlet coal mill on denitration system |
| CN112600254A (en) * | 2020-11-26 | 2021-04-02 | 杭州众工电力科技有限公司 | Thermal power generating unit AGC seamless control system based on pulverizing system |
| CN112600254B (en) * | 2020-11-26 | 2023-10-03 | 杭州众工电力科技有限公司 | AGC seamless control system of thermal power generating unit based on pulverizing system |
| CN113898968A (en) * | 2021-09-09 | 2022-01-07 | 华电电力科学研究院有限公司 | Balanced coal feeding control method for preventing direct-fired pulverizing system from being blocked and ground |
| CN113898968B (en) * | 2021-09-09 | 2023-06-27 | 华电电力科学研究院有限公司 | Balanced coal feeding control method for preventing blocking and grinding of direct-fired pulverizing system |
| CN113864811A (en) * | 2021-09-17 | 2021-12-31 | 华能汕头海门发电有限责任公司 | Coal amount compensation control method based on start and stop of direct-fired pulverizing system |
| CN114700164A (en) * | 2022-03-21 | 2022-07-05 | 华能海南发电股份有限公司海口电厂 | Method and system for judging coal mill powder blockage based on energy consumption index |
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| CN117282530B (en) * | 2023-11-24 | 2024-03-22 | 天津国能津能滨海热电有限公司 | Coal mill control method and device, storage medium and electronic equipment |
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