CN101551103B - Automatic boiler combustion control system of circulating fluid bed - Google Patents
Automatic boiler combustion control system of circulating fluid bed Download PDFInfo
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Abstract
The invention discloses an automatic boiler combustion control system of a circulating fluid bed, which is applied to machine sets for coal-fired power generation, heat supply or combined heat and power generation. The system comprises hardware and control program software, wherein the control program software comprises a fuel control part, an air volume control part and a deslagging control part,and the control program software can automatically and timely control the input quantity of boiler fuel, the oxygen content in the boiler and the boiler deslagging device. The combustion control syst em is applicable to all sorts of complicated operating conditions, has consistently correct and reliable reaction, advanced and reasonable algorithm design as well as good control effect, is safe and effective, has the capabilities of improving boiler combustion condition, increasing boiler combustion efficiency and reducing unburned carbon in flue dust, leads main steam pressure control to be stable, enhances the capability of tracking the change in load of the boiler and greatly improves the running safety performance, leads main steam temperature control precision to be effectively improved, avoids temperature excursion of an overheater, reduces the danger of steam turbine water slug caused by low-temperature steam, and improves the thermal efficiency and automation control degree of the steam turbine.
Description
Technical field:
The present invention relates to the boiler combustion control system of a kind of coal fired power generation, heat supply or cogeneration units, especially a kind of lonely network operation, automatic boiler combustion control system of circulating fluid bed of bearing peaking operation that load change is big, need are often regulated of being applicable to.
Background technology:
Recirculating fluidized bed (CFB) boiler is wide with its fuel tolerance, and ignition temperature is lower, and load regulation range is big, low fire coal inferior and rubbish particularly can burn, and reaching the desulfurization purpose by adding agstone in the stove, is a kind of clean and environment-friendly boiler, is used widely industrial.But recirculating fluidized bed (CFB) boiler is compared the application time ratio with the coal-powder boiler of combustion control technology maturation shorter, and the control principle that burns is also very unripe, and the application on a lot of engineerings still is in the stage of fumbling.Because its burning control is complicated, parameter is more, and intercoupling between each major parameter influences each other.On the other hand, the CFB boiler does not have pulverized coal preparation system, and fuel particle is big, and combustion process is long, causes combustion lag, and the thermal inertia of boiler is big, brings very big difficulty for burning control.
The control of CFB boiler combustion at present is main only to rely on operations staff's empirical value by regulating manually, does not have science to control foundation accurately.Existing automatic control also only can realize combustion chamber draft, the simple control automatically of main stripping temperature and steam water-level, though the burn achievement in research of automatic control aspect of number of C FB is also arranged, regulate and fuzzy control technology such as generally adopting the PID tandem, but because the factor too complex of influence burning control, only rest on the theoretical research at present, there is not actual application value, the control method of some is such as having adopted Smith Predictor control, advanced technology such as Self Adaptive Control and convergence algorithm, also only can under relatively stable load, burning in short-term control automatically, not have a kind of safe and effective, break away from manually-operated automatic combustion control technology fully.
Compare with the power plant that is incorporated into the power networks, island network or its technology of power plant of bearing online peak regulation task constitute then complicated more, keep that mains frequency and voltage are stable, to keep the energy equilibrium of supply and demand be top priority, and the adjusting of institute's energy requirement to lean on all finally boiler in time to adjust and replenish.Customer charge is to predict at random and not at any time, the load change uncertainty is very big, serious energy unbalanced supply-demand will have two kinds of consequences: one, the action of electrical network UFLS causes the electrical network removal of load to cause user's power failure, if UFLS is protected the malfunctioning serious consequence that will cause generator protection tripping operation, electric network from collapsing in this process; Two, main vapour pressure height; urgent steam discharge protection action even boiler safety valve events will be if steam discharge and the malfunctioning tripping of safety valve in this process will cause the vapour system superpressure; the serious consequence of boiler steam and water circuit blast be can cause when serious, the huge person and property loss caused.
Boiler for the piping-main scheme operation also exists boiler room to rob the problem that load, sharing of load and operation are optimized, because operations staff's technical merit is uneven, different people, different views in technology understanding that burning is adjusted and practice, existing boiler operatiopn rules also only limit to the explanation of directiveness, can not accomplish detailed prescription and guide are all made in each situation, each step operation, give operations staff individual's performance leeway very big; On the other hand, requiring the operations staff to follow the load variations follow-up adjustment all the time also is impossible realize, everyone judges different to the future trend of load, adjustment opportunity and amplitude are also different, therefore there is nonsynchronous inadequate natural endowment in artificial the adjustment, will inevitably cause the vapour pressure fluctuation, even exceed normal range (NR), make the security of operation reduce.Because artificial adjustment can't be accomplished the fine tuning of diligent accent, thereby make boiler combustion efficiency descend.
In view of above difficulty, present domestic piping-main scheme unit CFB boiler does not also have to solve fully the difficult problem on the burning automatic control technology.
Summary of the invention:
In order to overcome above-mentioned all deficiencies, the object of the present invention is to provide that a kind of control performance is stable, safe and reliable, automaticity is high and can improve the automatic boiler combustion control system of circulating fluid bed of boiler combustion efficiency.
Another object of the present invention is to provide a kind of method of air quantity control of automatic boiler combustion control system of circulating fluid bed.
To achieve these goals, the technical solution used in the present invention is: automatic boiler combustion control system of circulating fluid bed, comprise hardware and control program software two parts, hardware comprises feeder frequency converter, primary air fan blast regulator, overfire air fan blast regulator, air-introduced machine frequency converter, boiler slag removal device and computer, the feeder frequency converter is used to regulate the rotating speed of the feeder of coal supply in boiler, with the control coal-supplying amount; Primary air fan blast regulator, overfire air fan blast regulator, air-introduced machine frequency converter are used to regulate the air output of blower fan in boiler; The boiler slag removal device to boiler combustion after lime-ash carry out intermittence discharging; Computer is used for receiving the control parameter and goes out coal-supplying amount, air output according to the control calculation of parameter, and the formation control instruction is controlled feeder frequency converter, primary air fan blast regulator, overfire air fan blast regulator, air-introduced machine frequency converter, control program software is installed in the computer, and the control program software of this system comprises:
---fuel control section: be used to control the required fuel input quantity of boiler, can make timely, an amount of adjustment to the fuel input quantity, this part is to estimate module, coal-supplying amount computing module, coal-supplying amount correcting module, coal-supplying amount instruction control module by the online computing module of boiler efficiency, SR computing module, deviation computing module, load, wherein:
The online computing module of boiler efficiency is according to the control parameter: main vapour pressure, main stripping temperature, main steam flow amount, feed pressure, feed temperature, feedwater flow, coal-supplying amount, exhaust gas temperature, oxygen amount, ash content carbon obtain the steam generating capacity of boiler according to the heating power computing formula;
The SR computing module is used to calculate the demand load of boiler, detects the differential of therrmodynamic system change in resistance simultaneously,
This module need be used calculated data to be had: each boiler always steam load, main vapour pressure, terminal temperature difference pressure of steam supply, each steam turbine exhaust steam pressure, steam turbine pitch;
The deviation computing module is used for the measured value of main vapour pressure and the setting value of main vapour pressure are carried out the deviation computing, obtains the corrected parameter that coal-supplying amount calculates;
The coal-supplying amount computing module, corrected parameter in order to the coal-supplying amount of the steam generating capacity numerical value that receives the online computing module of boiler efficiency, boiler demand load numerical value that the SR computing module is calculated, deviation computing module calculates calculates the required coal-supplying amount of boiler according to above-mentioned parameter;
Load is estimated module, be used to predict the future trends of external load, make guidance in time adjusting furnace coal weight, the differential that this module can detect the therrmodynamic system change in resistance according to the rated power autobalance and the SR computing module of every steam turbine, accurately calculating following load variations trend, is the nucleus module that improves the combustion control system dynamic response characteristic.Being used for this module need use calculated data and have: main vapour pressure, main steam flow amount, each steam turbine velocity-compounded stage pressure;
The coal-supplying amount correcting module is estimated the corrected parameter that following load variations trend and bed temperature restriction are instructed, sharing of load instructs, the load limit instruction draws coal-supplying amount that module draws according to load;
The coal-supplying amount corrected parameter that coal-supplying amount that the boiler that the coal-supplying amount instruction control module is drawn according to the coal-supplying amount computing module is required and coal-supplying amount correcting module draw sends control instruction by computer to the feeder frequency converter.
Air quantity control section: be used to control the required air input of boiler, can effectively regulate control to air input, this part is to be made of primary air fan air quantity control module, overfire air fan air quantity control module, air-introduced machine air quantity control module, wherein, primary air fan air quantity control module, according to coal-supplying amount instruction, total load, bed pressure, wind coal proportion, draw required air quantity, according to bed temperature the air quantity that should carry of being tried to achieve is revised simultaneously, sent the air quantity regulating command to the primary air fan blast regulator according to revised institute required airflow; Overfire air fan air quantity control module, air quantity, load instruction according to total blast volume, primary air fan air quantity control module gained, draw the air quantity that overfire air fan should produce, and sharp oxygen consuming amount deviation revises the air quantity that overfire air fan should produce, and sends the air quantity regulating command according to revised institute required airflow to the overfire air fan blast regulator; Air-introduced machine air quantity control module, be used under the certain condition of flue resistance coefficient, controlling combustion chamber draft indirectly by pressure before the control air-introduced machine, the air quantity of the primary air fan that is drawn according to primary air fan air quantity control module, the air quantity of the overfire air fan that overfire air fan air quantity control module is drawn, coal-supplying amount draws the required air quantity of boiler, utilize total blast volume simultaneously, air-introduced machine pressure and negative pressure deviation draw air inducing amount corrected parameter, by air inducing amount corrected parameter the required air quantity of boiler is revised, the revised boiler of foundation institute required airflow sends the air quantity regulating command to the air-introduced machine frequency converter.
The deslagging control section is used to realize the deslagging control of boiler, and this part is realized by interrupted deslagging control module, interrupted deslagging control module, pressing setting value with bed is the control foundation, when setting value stops deslagging for 8.2KPa, 9.2KPa startup deslagging, deslagging are limited by main vapour pressure.
The blast regulator of described primary air fan or overfire air fan is meant fan frequency converter or fans entrance damper regulator.
The method of the air quantity control of automatic boiler combustion control system of circulating fluid bed may further comprise the steps: 1, multiply by 1.2 times the total demand for fuel air quantity of excess air coefficient conduct according to total wind coal proportion of coal-supplying amount and boiler design; 2, oxygen content measurement value and oxygen amount desired value (operations staff's setting) are carried out linearization process, produce the total blast volume correction factor; 3, utilize step 2 result calculated that step 1 value is revised, obtain total blast volume; 4, determine once, the ratio of secondary wind is: 4: 6; 5: 5; 6: 4, three kinds of ratio values according to the total blast volume of ratio value and step 3 gained, obtained the wind demand one time, and utilize bed temperature that primary air flow is revised, and carry out the deviation computing with actual primary air flow, according to revising the back airflow value primary air fan were controlled; 5, total blast volume deducts the secondary air flow that primary air flow obtains demand, carry out the deviation computing with secondary wind actual air volume and obtain revising the back airflow value, according to revising the back airflow value overfire air fan is controlled, wherein, pid parameter is set at: proportional band P=0.8%, the time of integration TI=40S, derivative time TD=0S; 6, under the certain condition of flue resistance coefficient, control combustion chamber draft indirectly by pressure before the control air-introduced machine, air quantity, the coal-supplying amount of the air quantity of the primary air fan that is drawn according to primary air fan air quantity control module, the overfire air fan that overfire air fan air quantity control module is drawn draw the required air quantity of boiler, utilize total blast volume, air-introduced machine pressure and negative pressure deviation to draw air inducing amount corrected parameter simultaneously, by air inducing amount corrected parameter the required air quantity of boiler is revised, the revised boiler of foundation institute required airflow sends the air quantity regulating command to the air-introduced machine frequency converter.
Operation principle: CFB boiler combustion control automatically is the complex process of a multifactor impact, multi parameters control, and system's thermal inertia is very big, must grasp 2 points when requiring to adjust, the one, in time, and the 2nd, an amount of.At first the coal supply adjustment is wanted in time will add when this adds, and must subtract when this subtracts.Because burning of coal needs a process, not only do not have supplementary function in case missed the energy of its burning back generation on opportunity, on the contrary system is caused artificial disturbance, aggravated the fluctuation of main vapour pressure.Next requires an amount of coal supply, too much or very fewly all can cause overshoot vibration, is very difficult by artificial accurately the adjustment in actual motion.Can accomplish that correct coal supply only is the first step, how guarantee the rapidly complete efficient combustion of these coals, air distribution is crucial.For making coal completing combustion as far as possible in burner hearth, reduce the heat loss due to incomplete combustion, burning is finished under the condition of excess of oxygen, therefore to control the excess air coefficient of boiler.Excess air can increase exhaust gas volumn again but then, and flue gas flow rate is accelerated, and heat exchange efficiency reduces, and causes that exhaust gas temperature raises, and reduces the thermal efficiency of boiler.Therefore must control flue gas oxygen content in a reasonable range.
Beneficial effect of the present invention: 1, this automatic burner control system is applicable to the operating condition of various complexity, and reaction is correct all the time reliable, and algorithm design is rationally advanced, and is safe and effective, controls respond well; 2, can improve the boiler combustion operating mode, improve boiler combustion efficiency, reduce unburned carbon in flue dust, have fine economic benefit; 3, main vapour pressure control is steady, and boiler follow load changing capability strengthens, and operational safety performance improves greatly; 4, main stripping temperature control accuracy effectively improves, avoided the superheater overtemperature, has reduced the danger that Low Temperature Steam causes the steam turbine water slug, has improved the thermal efficiency of steam turbine; 5, labor intensity of operating staff descends, and does not need manual intervention.
Description of drawings:
Fig. 1 is the structured flowchart of automatic boiler combustion control system of circulating fluid bed of the present invention.
Reference numeral:
1-feeder frequency converter, 2-primary air fan blast regulator, 3-overfire air fan blast regulator, 4-air-introduced machine frequency converter, 5-boiler slag removal device, the 6-computer, 7-control program software, 8-fuel control section, 9-coal-supplying amount instruction control module, 10-coal-supplying amount computing module, the online computing module of 11-boiler efficiency, 12-SR computing module, 13-deviation computing module, the 14-load is estimated module, 15-coal-supplying amount correcting module, 16-air quantity control section, 17-primary air fan air quantity control module, 18-overfire air fan air quantity control module, 19, air-introduced machine air quantity control module, 20-deslagging control section
The specific embodiment:
As shown in Figure 1, automatic boiler combustion control system of circulating fluid bed, comprise hardware and control program software two parts, hardware comprises feeder frequency converter 1, primary air fan blast regulator 2, overfire air fan blast regulator 3, air-introduced machine frequency converter 4, boiler slag removal device 5 and computer 6, feeder frequency converter 1 is used to regulate the rotating speed of the feeder of coal supply in boiler, with the control coal-supplying amount; Primary air fan blast regulator 2, overfire air fan blast regulator 3, air-introduced machine frequency converter 4 are used to regulate the air output of blower fan in boiler; Lime-ash carries out the intermittence discharging after 5 pairs of boiler combustions of boiler slag removal device; Computer 6 is used for receiving the control parameter and goes out coal-supplying amount, air output according to the control calculation of parameter, and the formation control instruction is controlled feeder frequency converter 1, primary air fan blast regulator 2, overfire air fan blast regulator 3, air-introduced machine frequency converter 4, boiler slag removal device 5, control program software 7 is installed in the computer 6, and the control program software of this system comprises:
Fuel control section 8: be used to control the required fuel input quantity of boiler, can make timely, an amount of adjustment to the fuel input quantity, this part is to estimate module 14, coal-supplying amount computing module 10, coal-supplying amount correcting module 15, coal-supplying amount instruction control module 9 by the online computing module 11 of boiler efficiency, SR computing module 12, deviation computing module 13, load, wherein:
The online computing module of boiler efficiency 11 is according to the control parameters: main vapour pressure, main stripping temperature, main steam flow amount, feed pressure, feed temperature, feedwater flow, coal-supplying amount, exhaust gas temperature, oxygen amount, ash content carbon obtain the steam generating capacity of boiler according to the heating power computing formula;
SR computing module 12 is used to calculate the demand load of boiler, detects the differential of therrmodynamic system change in resistance simultaneously,
This module need be used calculated data to be had: each boiler always steam load, main vapour pressure, terminal temperature difference pressure of steam supply, each steam turbine exhaust steam pressure, steam turbine pitch;
Coal-supplying amount computing module 10, corrected parameter in order to the coal-supplying amount of the steam generating capacity numerical value that receives the online computing module 11 of boiler efficiency, boiler demand load numerical value that SR computing module 12 is calculated, deviation computing module 13 calculates calculates the required coal-supplying amount of boiler according to above-mentioned parameter;
Load is estimated module 14, be used to predict the future trends of external load, make guidance in time adjusting furnace coal weight, the differential that this module can detect the therrmodynamic system change in resistance according to the rated power autobalance and the SR computing module of every steam turbine, accurately calculating following load variations trend, is the nucleus module that improves the combustion control system dynamic response characteristic.Being used for this module need use calculated data and have: main vapour pressure, main steam flow amount, each steam turbine velocity-compounded stage pressure;
Coal-supplying amount correcting module 15 is estimated the corrected parameter that following load variations trend and bed temperature restriction are instructed, sharing of load instructs, the load limit instruction draws coal-supplying amount that module 14 is drawn according to load;
The coal-supplying amount corrected parameter that coal-supplying amount that the boiler that coal-supplying amount instruction control module 9 is drawn according to coal-supplying amount computing module 10 is required and coal-supplying amount correcting module 15 draw sends control instruction to feeder frequency converter 1.
Air quantity control section 16: be used to control the required air input of boiler, can effectively regulate control to air input, this part is by primary air fan air quantity control module 17, overfire air fan air quantity control module 18, air-introduced machine air quantity control module 19 constitutes, wherein, primary air fan air quantity control module 17, instruct according to coal-supplying amount, total load, bed is pressed, wind coal proportion, draw required air quantity, according to bed temperature the air quantity that should carry of being tried to achieve is revised simultaneously, sent the air quantity regulating command to primary air fan blast regulator 2 according to revised institute required airflow; Overfire air fan air quantity control module 18, air quantity, load instruction according to total blast volume, primary air fan air quantity control module 17 gained, draw the air quantity that overfire air fan should produce, and sharp oxygen consuming amount deviation revises the air quantity that overfire air fan should produce, and sends the air quantity regulating command according to revised institute required airflow to overfire air fan blast regulator 3; Air-introduced machine air quantity control module 19, be used under the certain condition of flue resistance coefficient, controlling combustion chamber draft indirectly by pressure before the control air-introduced machine, the air quantity of the primary air fan that is drawn according to primary air fan air quantity control module 17, the air quantity and the coal-supplying amount of the overfire air fan that overfire air fan air quantity control module 18 is drawn draw the required air quantity of boiler, utilize total blast volume simultaneously, air-introduced machine pressure and negative pressure deviation draw air inducing amount corrected parameter, by air inducing amount corrected parameter the required air quantity of boiler is revised, the revised boiler of foundation institute required airflow sends the air quantity regulating command to air-introduced machine frequency converter 4.
The blast regulator of described primary air fan or overfire air fan adopts fan frequency converter.
The above only is a better embodiment of the present invention, so all equivalences of doing according to the described structure of patent claim of the present invention, feature and principle change or modify, is included in the patent claim of the present invention.
Claims (4)
1. automatic boiler combustion control system of circulating fluid bed, comprise hardware and control program software two parts, hardware comprises feeder frequency converter (1), primary air fan blast regulator (2), overfire air fan blast regulator (3), air-introduced machine frequency converter (4), boiler slag removal device (5) and computer (6), feeder frequency converter (1) is used to regulate the rotating speed of the feeder of coal supply in boiler, with the control coal-supplying amount; Primary air fan blast regulator (2), overfire air fan blast regulator (3), air-introduced machine frequency converter (4) are used to regulate the air output of blower fan in boiler; Boiler slag removal device (5) is used for lime-ash after the boiler combustion is carried out the intermittence discharging; Computer (6) is used for receiving the control parameter and goes out coal-supplying amount, air output according to the control calculation of parameter, and the formation control instruction is controlled feeder frequency converter (1), primary air fan blast regulator (2), overfire air fan blast regulator (3), air-introduced machine frequency converter (4), boiler slag removal device (5), control program software (7) is installed in the computer (6), it is characterized in that the control program software (7) of this system comprises:
Fuel control section (8): be used to control the required fuel input quantity of boiler, can make timely, an amount of adjustment to the fuel input quantity, this part comprises the online computing module of boiler efficiency (11), SR computing module (12), deviation computing module (13), loads and estimate module (14), coal-supplying amount computing module (10), coal-supplying amount correcting module (15), coal-supplying amount instruction control module (9), wherein:
The online computing module of boiler efficiency (11) according to the control parameter, obtains the steam generating capacity of boiler according to the heating power computing formula;
SR computing module (12) is used to calculate the demand load of boiler, detects the differential of therrmodynamic system change in resistance simultaneously;
Deviation computing module (13) is used for the measured value of main vapour pressure and the setting value of main vapour pressure are carried out the deviation computing, obtains the corrected parameter that coal-supplying amount calculates;
Coal-supplying amount computing module (10), corrected parameter in order to the coal-supplying amount of the steam generating capacity numerical value that receives the online computing module of boiler efficiency (11), boiler demand load numerical value that SR computing module (12) is calculated, deviation computing module (13) calculates calculates the required coal-supplying amount of boiler according to above-mentioned parameter;
Load is estimated module (14), be used to predict the future trends of external load, make guidance in time adjusting furnace coal weight, the differential that this module can detect the therrmodynamic system change in resistance according to the rated power autobalance and the SR computing module (12) of every steam turbine accurately calculates following load variations trend;
Coal-supplying amount correcting module (15) is estimated the corrected parameter that following load variations trend and bed temperature restriction are instructed, sharing of load instructs, the load limit instruction draws coal-supplying amount that module (14) is drawn according to load;
Coal-supplying amount instruction control module (9), the coal-supplying amount corrected parameter that coal-supplying amount that the boiler that is drawn according to coal-supplying amount computing module (10) is required and coal-supplying amount correcting module (15) draw sends control instruction by computer (6) to feeder frequency converter (1);
The control program software (7) of described system also comprises air quantity control section (16), this part is used to control the required air input of boiler, can effectively regulate control to air input, air quantity control section (16) is by primary air fan air quantity control module (17), overfire air fan air quantity control module (18), air-introduced machine air quantity control module (19) constitutes, wherein, primary air fan air quantity control module (17), instruct according to coal-supplying amount, total load, bed is pressed, wind coal proportion, draw required air quantity, according to bed temperature the air quantity that should carry of gained is revised simultaneously, sent the air quantity regulating command to primary air fan blast regulator (2) according to revised institute required airflow; Overfire air fan air quantity control module (18), air quantity, load instruction according to total blast volume, primary air fan air quantity control module (17) gained, draw the air quantity that overfire air fan should produce, and sharp oxygen consuming amount deviation revises the air quantity that overfire air fan should produce, and sends the air quantity regulating command according to revised institute required airflow to overfire air fan blast regulator (3); Air-introduced machine air quantity control module (19), be used under the certain condition of flue resistance coefficient, controlling combustion chamber draft indirectly by pressure before the control air-introduced machine, the air quantity of the primary air fan that is drawn according to primary air fan air quantity control module (17), the air quantity and the coal-supplying amount of the overfire air fan that overfire air fan air quantity control module (18) is drawn draw the required air quantity of boiler, utilize total blast volume simultaneously, air-introduced machine pressure and negative pressure deviation draw air inducing amount corrected parameter, by air inducing amount corrected parameter the required air quantity of boiler is revised, the revised boiler of foundation institute required airflow sends the air quantity regulating command to air-introduced machine frequency converter (4).
2. automatic boiler combustion control system of circulating fluid bed according to claim 1, it is characterized in that: the control program software of described system also comprises deslagging control section (20), be used to realize the deslagging control of boiler, this part is realized by interrupted deslagging control module, interrupted deslagging control module is controlled boiler slag removal device (5), pressing setting value with bed is the control foundation, and when setting value to 8.2KPa stops deslagging, 9.2KPa starts boiler slag removal device (5) deslagging.
3. automatic boiler combustion control system of circulating fluid bed according to claim 1 is characterized in that: described primary air fan blast regulator (2), overfire air fan blast regulator (3) are meant fan frequency converter or fans entrance damper regulator.
4. the method for the air quantity of the described automatic boiler combustion control system of circulating fluid bed of claim 1 control, it is characterized in that: this method may further comprise the steps: 1, multiply by 1.2 times excess air coefficient as total demand for fuel air quantity according to total wind coal proportion of coal-supplying amount and boiler design; 2, oxygen content measurement value and the oxygen amount desired value that the operations staff is set carried out linearization process, produces the total blast volume correction factor; 3, utilize step 2 result calculated that step 1 value is revised, obtain total blast volume; 4, determine once, the ratio of secondary wind is: 4: 6; 5: 5; 6: 4, three kinds of ratio values, the total blast volume according to ratio value and step 3 gained obtains primary air flow, and utilizes bed temperature that primary air flow is revised, and carries out the deviation computing with actual primary air flow, according to revising the back airflow value primary air fan is controlled; 5, total blast volume deducts the secondary air flow that primary air flow obtains demand, carry out the deviation computing with secondary wind actual air volume and obtain revising the back airflow value, according to revising the back airflow value overfire air fan is controlled, wherein, pid parameter is set at: proportional band P=0.8%, the time of integration TI=40S, derivative time TD=0S; 6, under the certain condition of flue resistance coefficient, control combustion chamber draft indirectly by pressure before the control air-introduced machine, air quantity, the coal-supplying amount of the air quantity of the primary air fan that is drawn according to primary air fan air quantity control module, the overfire air fan that overfire air fan air quantity control module is drawn draw the required air quantity of boiler, utilize total blast volume, air-introduced machine pressure and negative pressure deviation to draw air inducing amount corrected parameter simultaneously, by air inducing amount corrected parameter the required air quantity of boiler is revised, the revised boiler of foundation institute required airflow sends the air quantity regulating command to the air-introduced machine frequency converter.
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