CN105627356B - A kind of metallurgical gas fired-boiler combustion control system - Google Patents
A kind of metallurgical gas fired-boiler combustion control system Download PDFInfo
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- CN105627356B CN105627356B CN201511012748.4A CN201511012748A CN105627356B CN 105627356 B CN105627356 B CN 105627356B CN 201511012748 A CN201511012748 A CN 201511012748A CN 105627356 B CN105627356 B CN 105627356B
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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
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
- F23N1/102—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/44—Optimum control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Abstract
A kind of metallurgical gas fired-boiler combustion control system is related to metallurgical gas fired-boiler control technology field, including liquid level of steam drum control loop, Stream temperature degree control loop, furnace pressure control loop, air blowing control loop, optimization of air-fuel ratio controller and load control circuit.The system realizes gas fired-boiler and automatically controlled, and all technical meets the operating index of gas fired-boiler, by optimizing air-fuel ratio so that coal gas both can fully burn, and it is excessive to be unlikely to air quantity again, increase flue gas loss, realize the energy-saving of boiler；Solves the steady sex chromosome mosaicism of steam water-level, furnace pressure and gas pressure, the problem of false liquid level, the problem of air capacity and gas volume are difficult to automatically control, the problem of Stream temperature degree accurately controls, realize and prejudge in advance, advancement, air-fuel ratio is from optimizing, burning is more stable, has reached the purpose of energy-saving and emission-reduction.
Description
Technical field
The present invention relates to metallurgical gas fired-boiler control technology field, more particularly to a kind of metallurgical gas fired-boiler burning optimization control
System processed.
Background technology
In the use of metallurgical gas fired-boiler, caused blast furnace gas, coke-stove gas, coal gas of converter are raw material in process of production,
Steam is produced, for steam turbine power generation or drives other blower fans.
In recent years, the economic development in China brings serious problem of environmental pollution, caused floating such as in energy source use
The harmful substance moment such as dirt, tail gas, coal smoke damages the health of people, and the also improvement to environment brings very big difficulty, and
If caused blast furnace gas, coke-stove gas, coal gas of converter are not used and directly diffused in process of production for iron and steel enterprise, both
The energy is wasted, while seriously pollutes environment, therefore how to be used these coal gas, turns waste into wealth and just seems very heavy
Will, gas fired-boiler just solves this problem well.
In gas fired-boiler operation coal gas is adjusted according to combined factors such as the pressure of gaspipe network, drum pressure, generation loads
The increase and decrease of valve.Most of Ferrous Metallurgy gas fired-boiler is being run manually at present, it is manually operated not in time, gaspipe network pressure is too
The low safe operation for directly affecting boiler, gaspipe network pressure cause coal gas diffusion waste and coal gas heat without increase in time greatly
The height air distribution of value will influence boiler economic operation not in time, manually operated to meet power generation needs and the stabilization of gaspipe network
Deng.Because gaspipe network pressure oscillation is big, operative employee needs frequent operation, and the change of coal gas regulation causes air distribution, air-supply, drum
The frequent operation of liquid level and Stream temperature degree, operations staff's labor intensity are big.
Li Zhonghu etc. proposes that water level control uses traditional three blunt quantity control mode, and superheat steam temperature control sets two-stage mistake
Hot device and two-stage desuperheating device, so that superheated steam outlet temperature maintains within the range of permission, first order superheater goes out
Mouth vapor (steam) temperature control uses cascade control system, and main controlled variable is outlet steam temperature, and secondary controlled variable subtracts for the first order
Warm water flow, to improve control performance, superheater outlet vapor (steam) temperature control in the second level uses single loop control system, is controlled and becomes
Measure as second level superheater outlet vapor (steam) temperature；Load control circuit calculates with air quantity according to air-fuel ratio, and air-fuel ratio is according to oxygen
Content is modified, and the control point of oxygen content is with load variations, referring to chemical process automation and instrument third phase 370- in 2012
Page 372.
Xu Baozhen proposes that liquid level of steam drum control by the way of manually and automatically control is coordinated, reaches automatically adjusting valve
Need to intervene manually in the case of accommodation limit and adjust another valve, the control of Stream temperature degree uses the tandem control of temperature water
Mode processed, the air distribution of spatial load forecasting is by the way of gas pressure and air pressure proportioning, referring to Application of Microcomputer and automation
35-38 pages of the third phase in 2004.
Han Mingjie proposes that water level control uses traditional three blunt quantity control mode, using feedwater main road regulating valve as main regulation
Valve, used in normal duty and heavy-duty service, bypass valve uses in underload, under self water feeding state, only
One of them is allowed to participate in automatically adjusting feedwater, another regulating valve can carry out confluent adjustment, combustion chamber draft manually on DCS
Control is controlled by adjusting air-introduced machine inlet baffle aperture, and control of steam temperature uses IPD bunch grade adjustment modes, dynamic referring to metallurgy
Power the 7th 51-53 pages of the phase in 2014.
It was found from above control method, current water level control mostly uses traditional three blunt quantity control mode, does not account for
The factor of burning, when there is burning large change, easily there is larger false liquid level, control accuracy can not ensure；Stream temperature degree
Control uses the serials control mode of temperature water, but live in general, and the measurement deviation of spray water flux is very big, it is difficult to
Used in the scene of reality, while use unity loop control, control point is fixed, and when load fluctuation, fixed control point is not
Suitably；Spatial load forecasting carries out air distribution, but the factor such as oxygen content, calorific value of gas, gas pressure and air pressure according to air-fuel ratio
Influence problem to load does not solve.
In summary, prior art still has some limitations and defect, therefore proposes this control system.
The content of the invention
In view of the above-mentioned problems, the purpose of the present invention is overcome the deficiencies in the prior art, there is provided a kind of metallurgical gas fired-boiler combustion
Burn Optimal Control System.
To achieve the above object, the present invention takes following technical scheme：A kind of metallurgical gas fired-boiler combustion control system
System, including liquid level of steam drum control loop, Stream temperature degree control loop, furnace pressure control loop, air blowing control loop, air-fuel ratio
Optimal controller and gas flow control loop.
Liquid level of steam drum control loop
Liquid level of steam drum control loop uses serials control mode, and liquid level of steam drum setting apparatus needs to control according to setting is actually needed
The liquid level of steam drum of system, the output of liquid level of steam drum setting apparatus and input of the steam drum liquid level measurement instrument as liquid level of steam drum adjuster, vapour
The output of bag liquid level regulator is carbonated drink bias compensation value, and the output of burning factor feed-forward compensator is made with carbonated drink bias compensation value sum
It is inclined as carbonated drink bias measures, carbonated drink for carbonated drink error set point, the actual carbonated drink deviation of carbonated drink deviation calculator output
The input of poor setting value and carbonated drink bias measures as carbonated drink bias adjustment device, carbonated drink bias adjustment device are exported to feed-water valve
Aperture is adjusted.
Stream temperature degree control loop
Stream temperature degree setting apparatus is according to output Stream temperature degree setting value is actually needed, and Stream temperature degree adjuster is according to Stream temperature
Deviation between actual Stream temperature angle value and Stream temperature degree setting value that degree measuring instrumentss obtain, with being mended according to burning factor feedforward
Repay the aperture of the common adjustment desuperheat penstock of output of device.
Furnace pressure control loop
Furnace pressure setting value is set by furnace pressure setting apparatus, and furnace pressure adjuster is according to furnace pressure measuring instrument
Deviation between actual furnace pressure value and furnace pressure setting value that table obtains, the output with gas-air feed-forward compensator are total to
With the aperture of adjustment air-introduced machine.
Air blowing control loop
The deviation for the amount of actual air for combustion that air handler measures according to air capacity setting apparatus and air-flow measurement instrument,
Pressure fan aperture is adjusted, the output of wherein air capacity setting apparatus is that measurement of gas flow instrument measures actual gas volume and air-fuel ratio
The product of the output of calculator, the input of air-fuel ratio calculator is optimization of air-fuel ratio controller and oxygen amount air-fuel ratio compensator sum.
Optimization of air-fuel ratio controller
Step-length SOP=ε * F of optimizing are set firstA, wherein FAFor present air flow, ε is allowable error
1. constant gas flow definite value, air flow valve position is output to using present air flow as air mass flow setting value
Calculator, optimal controller running mark are arranged to ON, and an optimization object function value J is recorded after a period of time1；
2. selection increase air mass flow, putting n=n+1, air mass flow setting value increment is the step-length n*SOP set, is exported empty
Throughput setting value is to air flow valve position calculator；Change current air-fuel ratio, turn to the and 8. walk, n is counter；
If 3. J2>J1When, illustrate the in the right direction of searching, this direction finding is continued on, J2Value be assigned to J1,
The is turned to 2. to walk；If J2<J1When, judge to be first time optimizing, i.e. whether n is 1, if during n=1, illustrates searching side
To mistake, turn to the and 4. walk.If during n ≠ 1, and | J2-J1|<During ε, then present air fuel ratio is optimum state, this optimizing
Terminate, optimal controller running mark is arranged to OFF.If during n ≠ 1, and | J2-J1|>During ε, then variable step find put SOP=-
0.25*SOP, turn to the and 2. walk；
4. selection increase air mass flow, puts n=n+1, air mass flow setting value increment is the step-length n* set（-SOP）, it is defeated
Go out air mass flow setting value to air flow valve position calculator, change current air-fuel ratio, turn to the and 8. walk；
If 5. J2>J1When, illustrate that investigation is correct, direction searching is continued on, J2Value be assigned to J1, turn to
4. walks；
If 6. J2<J1When, and | J2-J1|<During ε, then present air fuel ratio is optimum state, and this optimizing terminates, excellent
Change controller running mark and be arranged to OFF；
If 7. J2<J1When, and | J2-J1|>During ε, then variable step is found and puts SOP=- 0.25*SOP, turns to the and 2. walks；
8. target function value calculates, with the stable state real-time process measured value after dynamic response, calculated by optimization object function
Target function value J2, that is, start to calculate after optimizing a period of time after output action to device, the time depends on the dynamic of process
Response time, return to the original position turned over.
Gas flow control loop
The actual gas flow that gas flow adjuster measures according to gas flow setting apparatus and measurement of gas flow instrument
Deviation, adjust gas regulator door aperture, the input of wherein gas flow setting apparatus is the setting of gas flow fundamental quantity, main vapour
Pressure regulator exports and gas main pressure regulator output sum；Main vapour pressure adjuster is defeated according to main vapour pressure setting apparatus
Go out and main vapour pressure measuring instrumentss measure the deviation of actual main vapour pressure value and are adjusted；Gas main pressure regulator is according to coal
The deviation that the output of gas manifold pressure setting apparatus and gas main pressure measuring instruments measure actual manifold pressure value is adjusted；It is main
Steam pressure setting apparatus and gas main pressure setting apparatus are set all in accordance with being actually needed.
The invention has the advantages that：Liquid level of steam drum control loop increases combustion on the basis of traditional three blunt quantity control
Burn factor feedforward so that adjustment is quicker, more stable；Stream temperature degree control loop directly controls desuperheating water in Stream temperature degree
Increase the feedforward of burning factor on the basis of valve, advancement, adjust in advance, stable Stream temperature degree；Furnace pressure control loop
Furnace pressure, increase coal gas total amount and air-supply total amount feedforward are directly adjusted using air-introduced machine, adjust air-introduced machine, stable burner hearth in advance
Negative pressure；Combustion system control uses serials control mode, and main regulation is that main vapour pressure adjusts gas flow control point, and pair is adjusted to
Gas flow control gas valve position；Air blowing control uses Ratio control method, and air quantity control is calculated according to gas flow and air-fuel ratio
It is processed, pressure fan aperture is adjusted according to actual air volume；Empty so optimal-search control is found optimal by optimization Rolling optimal strategy of retreating
Empty so proportioning.
By above technological means, realize gas fired-boiler and automatically control, all technical meets the fortune of gas fired-boiler
Row index, by optimizing air-fuel ratio so that coal gas both can fully burn, and it is excessive to be unlikely to air quantity again, increase flue gas loss, real
Now boiler is energy-saving；Solves the steady sex chromosome mosaicism of steam water-level, furnace pressure and gas pressure, false liquid level is asked
The problem of topic, the problem of air capacity and gas volume are difficult to automatically control and Stream temperature degree accurately control, realizes and prejudges in advance, carry
Preceding action, for air-fuel ratio from optimizing, burning is more stable, has reached the purpose of energy-saving and emission-reduction.
Brief description of the drawings
Accompanying drawing 1 is liquid level of steam drum control loop flow chart.
Accompanying drawing 2 is main stripping temperature control loop flow chart.
Accompanying drawing 3 is furnace pressure control loop flow chart.
Accompanying drawing 4 is air blowing control loop flow chart.
Accompanying drawing 5 is gas flow control loop flow chart.
Accompanying drawing 6 is optimization of air-fuel ratio controller flow chart.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Liquid level of steam drum control loop
Liquid level of steam drum adjuster, using pid control algorithm, liquid level of steam drum setting value is L_SP, and steam drum liquid level measurement value is
L_PV, export as L_AV, parameter P span is 200~250 wherein in pid control algorithm, and parameter I span is
200~300, parameter D span are 30~40；It is drum liquid that carbonated drink deviation calculator, which exports basic carbonated drink deviation QS_JB,
Position control loop automatically adjusts the current carbonated drink deviation of moment record, i.e.,
IF GSAUTO=TRUE THEN
QS_JB=QS_AV
Wherein, GSAUTO is that liquid level of steam drum automatically adjusts enable signal, and QS_AV is liquid level of steam drum adjuster output valve；
Burning factor feed-forward compensator setting value is QKRS1_SP, and measured value is that liquid level of steam drum control loop automatically adjusts wink
Between the current coal gas total amount QKRS1_PV that records, export as QKRS1_AV=K1* (QKRS1_PV-QKRS1_SP), wherein K1=-
0.0005；
Carbonated drink bias adjustment device, using pid control algorithm, carbonated drink error set point QS_SP is liquid level of steam drum adjuster
L_AV, burning factor feed-forward compensator output QKRS1_AV and basic carbonated drink error set point QS_JB three's sum are exported, i.e.,
QS_SP=L_AV+QKRS1_AV+QS_JB, carbonated drink deviation QS_AV are measured value, export and directly act on feedwater tune for QS_AV
Valve is saved, parameter P span is 80~100 wherein in pid control algorithm, and parameter I span is 50~60, parameter
D span is 20~30.
Stream temperature degree control loop
Stream temperature degree adjuster uses pid control algorithm, and Stream temperature degree setting value is T_SP, and Stream temperature degree T_PV is measurement
Value, export as T_AV, parameter P span is 100~150 wherein in pid control algorithm, and parameter I span is 50
~100, parameter D span are 50~70；
Burning factor feed-forward compensator setting value is QKRS2_SP, and measured value is that main stripping temperature control loop automatically adjusts wink
Between the current coal gas total amount QKRS2_PV that records, export as QKRS2_AV=K2* (QKRS2_PV-QKRS2_SP), wherein K2=
0.0008；
Stream temperature degree adjuster exports T_AV and burning factor feed-forward compensator exports QKRS2_AV collective effects in desuperheat
Water regulating valve door.
Furnace pressure control loop
Furnace pressure adjuster uses pid control algorithm, and furnace pressure setting value is LTP_SP, and furnace pressure LTP_PV is
Measured value, export as LTP_AV, parameter P span is 550~650 wherein in pid control algorithm, parameter I value model
It is 50~100 to enclose, and parameter D span is 80~100；
Gas-air total amount feed-forward compensator setting value is QKQT_SP, and measured value is that furnace pressure control loop is adjusted automatically
The current gas-air total amount QKQT_PV of moment record is saved, is exported as QKQT_AV=K3* (QKQT_PV-QKQT_SP), wherein K3
=0.0004；
Furnace pressure adjuster export LTP_AV and gas-air total amount feed-forward compensator output QKQT_AV collective effects in
Air-introduced machine control valve.
Air blowing control loop
Air handler uses pid control algorithm, and air capacity setting value is KQ_SP, and air capacity KQ_PV is measured value,
Exporting as KQ_AV, parameter P span is 100~200 wherein in pid control algorithm, parameter I span is 30~
80, parameter D span are 50~80；
The product that the output of air capacity setting apparatus is current coal gas total amount MQ_PV and air-fuel ratio FMB, i.e. KQ_SP=MQ_PV*
FMB；
Air-fuel ratio calculator output FMB is that optimization of air-fuel ratio controller exports YHFMB and the output of oxygen amount air-fuel ratio compensator
YLFMB sum, i.e. FMB=YHFMB+YLFMB.
Optimization of air-fuel ratio controller
Step-length SOP=ε * F of optimizing are set firstA（ε span 1%~2%）, wherein FAFor present air total flow, ε
For allowable error
1. constant gas flow definite value, air flow valve position is output to using present air flow as air mass flow setting value
Calculator, optimal controller running mark are arranged to ON, and an optimization object function value J is recorded after 1~2 minute1；
2. selection increase air mass flow, putting n=n+1, air mass flow setting value increment is the step-length n*SOP set, is exported empty
Throughput setting value is to air flow valve position calculator；Change current air-fuel ratio, turn to the and 8. walk, wherein n is counts
Device；
If 3. J2>J1When, illustrate the in the right direction of searching, this direction finding is continued on, J2Value be assigned to J1,
The is turned to 2. to walk；If J2<J1When, judge to be first time optimizing, i.e. whether n is 1, if during n=1, illustrates searching side
To mistake, turn to the and 4. walk.If during n ≠ 1, and | J2-J1|<During ε, then present air fuel ratio is optimum state, this optimizing
Terminate, optimal controller running mark is arranged to OFF.If during n ≠ 1, and | J2-J1|>During ε, then variable step find put SOP=-
0.25*SOP, turn to the and 2. walk；
4. selection increase air mass flow, puts n=n+1, air mass flow setting value increment is the step-length n* set（-SOP）, it is defeated
Go out air mass flow setting value to air flow valve position calculator, change current air-fuel ratio, turn to the and 8. walk；
If 5. J2>J1When, illustrate that investigation is correct, direction searching is continued on, J2Value be assigned to J1, turn to
4. walks；
If 6. J2<J1When, and | J2-J1|<During ε, then present air fuel ratio is optimum state, and this optimizing terminates, excellent
Change controller running mark and be arranged to OFF；
If 7. J2<J1When, and | J2-J1|>During ε, then variable step is found and puts SOP=- 0.25*SOP, turns to the and 2. walks；
8. target function value calculates, with the stable state real-time process measured value after dynamic response, calculated by optimization object function
Target function value J2, that is, start to calculate after optimizing a period of time after output action to device, the time depends on the dynamic of process
Response time, typically taken for heating furnace 1~2 minute, return to the original position turned over.
Oxygen amount air-fuel ratio compensator
Oxygen amount air-fuel ratio compensator uses pid control algorithm, and oxygen amount setting value is YL_SP, and oxygen amount YL_PV is measured value,
Exporting as YL_AV, parameter P span is 120~180 wherein in pid control algorithm, parameter I span is 60~
80, parameter D span are 50~70.
Gas flow control loop
Gas flow adjuster uses pid control algorithm, and gas flow setting value is MQ_SP, and gas flow MQ_PV is survey
Value, export as MQ_AV, parameter P span is 100~150 wherein in pid control algorithm, and parameter I span is
30~50, parameter D span are 40~60；
Gas flow setup algorithm device exports MQ_SP=MQ_JB+QY_AV+MY_AV；
Coal gas fundamental quantity calculator, coal gas fundamental quantity MQ_JB are that load control circuit automatically adjusts the current of moment record
Gas volume
IF MQAUTO=TRUE THEN
MQ_JB=MQ_AV
Main vapour pressure adjuster uses pid control algorithm, and main vapour pressure setting value is QY_SP, and main vapour pressure QY_PV is survey
Value, export as QY_AV, parameter P span is 80~100 wherein in pid control algorithm, and parameter I span is
30~40, D span are 30~50；
Gas main pressure regulator uses pid control algorithm, and gas main pressure set points are MY_SP, gas main
Pressure MY_PV is measured value, is exported as MY_AV, and parameter P span is 60~90 wherein in pid control algorithm, parameter I
Span be 30~40, parameter D span is 30~50.
Claims (1)
1. a kind of metallurgical gas fired-boiler combustion control system, it is characterised in that provided with liquid level of steam drum control loop, Stream temperature
Spend control loop, furnace pressure control loop, air blowing control loop, optimization of air-fuel ratio controller and gas flow control loop；
Liquid level of steam drum control loop
Liquid level of steam drum control loop uses serials control mode, and liquid level of steam drum setting apparatus needs what is controlled according to setting is actually needed
Liquid level of steam drum, the output of liquid level of steam drum setting apparatus and input of the steam drum liquid level measurement instrument as liquid level of steam drum adjuster, drum liquid
Position adjuster output is carbonated drink bias compensation value, and the feed-forward compensator output of burning factor is with carbonated drink bias compensation value sum as vapour
Water error set point, the actual carbonated drink deviation of carbonated drink deviation calculator output are set as carbonated drink bias measures, carbonated drink deviation
The input of definite value and carbonated drink bias measures as carbonated drink bias adjustment device, carbonated drink bias adjustment device are exported to feed-water valve aperture
It is adjusted；
Stream temperature degree control loop
Stream temperature degree setting apparatus is surveyed according to output Stream temperature degree setting value, Stream temperature degree adjuster is actually needed according to Stream temperature degree
Deviation between amount instrument obtained actual Stream temperature angle value and Stream temperature degree setting value, and according to burning factor feed-forward compensator
The common adjustment desuperheat penstock of output aperture；
Furnace pressure control loop
Furnace pressure setting value is set by furnace pressure setting apparatus, and furnace pressure adjuster obtains according to furnace pressure measuring instrumentss
Deviation between the actual furnace pressure value and furnace pressure setting value that arrive, the output with gas-air feed-forward compensator are adjusted jointly
The aperture of whole air-introduced machine；
Air blowing control loop
The deviation for the amount of actual air for combustion that air handler measures according to air capacity setting apparatus and air-flow measurement instrument, adjustment
Pressure fan aperture, the output of wherein air capacity setting apparatus is that measurement of gas flow instrument measures actual gas volume and air-fuel ratio calculating
The product of the output of device, the input of air-fuel ratio calculator is optimization of air-fuel ratio controller and oxygen amount air-fuel ratio compensator sum；
Optimization of air-fuel ratio controller
Step-length SOP=ε * F of optimizing are set firstA, wherein FAFor present air flow, ε is allowable error
1. constant gas flow definite value, present air flow is output to air flow valve position as air mass flow setting value and calculated
Device, optimal controller running mark are arranged to ON, and an optimization object function value J is recorded after a period of time1；
2. selection increase air mass flow, puts n=n+1, air mass flow setting value increment is the step-length n*SOP set, delivery air stream
Setting value is measured to air flow valve position calculator；Change current air-fuel ratio, turn to the and 8. walk, n is counter；
If 3. J2>J1When, illustrate the in the right direction of searching, this direction finding is continued on, J2Value be assigned to J1, turn to the
2. walk；If J2<J1When, judge to be first time optimizing, i.e. whether n is 1, if during n=1, illustrates investigation mistake,
The is turned to 4. to walk；If during n ≠ 1, and | J2-J1|<During ε, then present air fuel ratio is optimum state, and this optimizing terminates, excellent
Change controller running mark and be arranged to OFF；If during n ≠ 1, and | J2-J1|>During ε, then variable step is found and puts SOP=- 0.25*
SOP, turn to the and 2. walk；
4. selection increase air mass flow, puts n=n+1, air mass flow setting value increment is the step-length n* set（-SOP）, output sky
Throughput setting value changes current air-fuel ratio to air flow valve position calculator, turns to the and 8. walks；
If 5. J2>J1When, illustrate that investigation is correct, direction searching is continued on, J2Value be assigned to J1, turn to the 4.
Step；
If 6. J2<J1When, and | J2-J1|<During ε, then present air fuel ratio is optimum state, and this optimizing terminates, optimization control
Device running mark processed is arranged to OFF；
If 7. J2<J1When, and | J2-J1|>During ε, then variable step is found and puts SOP=- 0.25*SOP, turns to the and 2. walks；
8. target function value calculates, with the stable state real-time process measured value after dynamic response, target is calculated by optimization object function
Functional value J2, that is, start to calculate after optimizing a period of time after output action to device, the time depends on the dynamic response of process
Time, return to the original position turned over；
Gas flow control loop
The actual gas flow that gas flow adjuster measures according to gas flow setting apparatus with measurement of gas flow instrument it is inclined
Difference, gas regulator door aperture is adjusted, the input of wherein gas flow setting apparatus is the setting of gas flow fundamental quantity, main vapour pressure
Adjuster exports and gas main pressure regulator output sum；Main vapour pressure adjuster according to main vapour pressure setting apparatus output with
The deviation that main vapour pressure measuring instrumentss measure actual main vapour pressure value is adjusted；Gas main pressure regulator is total according to coal gas
The deviation that the output of pipe pressure setting apparatus and gas main pressure measuring instruments measure actual manifold pressure value is adjusted；Main vapour pressure
Power setting apparatus and gas main pressure setting apparatus are set all in accordance with being actually needed.
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