CN101078525A - Automatic optimization control method of boiler air-supply volume - Google Patents
Automatic optimization control method of boiler air-supply volume Download PDFInfo
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- CN101078525A CN101078525A CN 200710028793 CN200710028793A CN101078525A CN 101078525 A CN101078525 A CN 101078525A CN 200710028793 CN200710028793 CN 200710028793 CN 200710028793 A CN200710028793 A CN 200710028793A CN 101078525 A CN101078525 A CN 101078525A
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Abstract
The invention discloses an automatic optimal control method for supplied air volume of boiler. It is provided with stable running, high automation and improved heat efficiency of boiler. Technical points are that by measuring running parameter of boiler and fuel consumption volume in time, heat efficiency of boiler is calculated; these data are sent to the digital fuzzy regulator to analyze; supplied air volume is adjusted correctly so that it approaches the optimal supplied air volume in actual working condition; when the ratio of variable quantity of supplied air volume and variable quantity of heat efficiency is larger than zero, supplied air volume is adjusted on the direction continuously; when the ratio is smaller than zero, supplied air volume is adjusted on the opposite direction; when the ratio is equal with zero, corresponding supplied air volume is the optimal value. The invention is applied in optimal control for supplied air volume of coal-fired boiler.
Description
Technical field
The present invention relates to a kind of boiler control technology, be meant a kind of automatic optimization control method of boiler air-supply volume especially.
Background technology
As everyone knows, boiler burns when control, in time regulate air output its Fuel Consumption with boiler is adapted, thereby the thermal efficiency of assurance boiler is always maintained at peak, corresponding air output is exactly best air output, and corresponding excess air coefficient is best excess air coefficient.The burning Automatic adjustment method that everybody knows is, find out the best excess air coefficient and the corresponding best flue gas oxygen content of boiler by the boiler heating power experiment, use online flue gas oxygen measuring apparatus continuous measurement flue gas oxygen content then, regulate flue gas oxygen content automatically by automatic combustion regulating system again and maintain optimum value.This control method has a significant disadvantages, be exactly the best flue gas oxygen content of different boiler be different, and same boiler at last just, when its load or fuel characteristic when changing, best flue gas oxygen content is also different, therefore when being adjusted to so-called best flue gas oxygen content automatically, the thermal efficiency of boiler might not be exactly the highest, so this control method does not have actual using value.
Applicant of the present invention is at this situation, a kind of best air output Automatic Optimal control method of boiler has been proposed, different fully with above-mentioned method, automatic combustion regulating system according to this method design, BTHE by automatic calculating boiler, and be optimized calculating, and find best air output automatically, be always maintained at highest level with the thermal efficiency that keeps boiler.This method need not carried out heating power test (this is the hard work of a complexity) to boiler in order to look for best flue gas oxygen content, does not more need to install online flue gas oxygen measuring apparatus (this instrument is very expensive, the maintenance cost height).
Summary of the invention
The technical problem to be solved in the present invention provide a kind of stable, automaticity is high, can effectively improve the automatic optimization control method of the boiler air-supply volume of boiler thermal output.
Technical scheme of the present invention is such; A kind of automatic optimization control method of boiler air-supply volume, be by real-time measurement boiler operating parameter and Fuel Consumption, calculate the thermal efficiency of boiler, these data are delivered in the digital Fuzzy Controller analyzed, the correct air output of regulating makes it progressively approach the best air output of actual condition; When the ratio of the variable quantity of the variable quantity of air output and the thermal efficiency greater than zero the time, continue to regulate air output by this direction; When slope less than zero the time, press rightabout adjusting air output; When slope equalled zero, at this moment Dui Ying air output was exactly an optimum value.
The control method of the digital Fuzzy Controller described in the automatic optimization control method of above-mentioned boiler air-supply volume is, with boiler efficiency, coal-air ratio optimization, set coal-air ratio, best coal-air ratio, actual coal-supplying amount, need air output data inputs differentiation element, differentiation element output required airflow gathers, and passes to PID adjuster or the work of hand adjustment device control air-supply frequency converter after the artificial correction air output correction that is provided with; When manual state: coal-air ratio optimization=0, best coal-air ratio=setting coal-air ratio+coal-air ratio optimization needs air output=best coal-air ratio * actual coal-supplying amount, and required airflow gathers=blows frequency, revises air output=required airflow and gathers-need air output; When auto state: best coal-air ratio=setting coal-air ratio+coal-air ratio optimization, need air output=best coal-air ratio * actual coal-supplying amount, revise air output=artificial setting value, required airflow gathers=needs air output+correction air output.
Differentiation element described in the automatic optimization control method of above-mentioned boiler air-supply volume is pressed positive interaction work, comprises that a proportional band is 100% ratio unit.
Setting coal-air ratio described in the automatic optimization control method of above-mentioned boiler air-supply volume can be according to formula: set coal-air ratio=air-supply frequency/actual coal-supplying amount, estimate or determine by following test: (1) at than underrun about 1 hour, air-supply frequency Fd and coal-supplying amount Md that the normal postscript of boiler combustion is corresponding down; (2) move about 1 hour in higher load, air-supply frequency Fg and coal-supplying amount Mg that the normal postscript of boiler combustion is corresponding down; (3) set coal-air ratio=(Fg-Fd)/(Mg-Md), manually input on touch-screen.
Correction air output described in the automatic optimization control method of above-mentioned boiler air-supply volume is manually input on touch-screen.
Sampling period span during coal-air ratio described in the automatic optimization control method of above-mentioned boiler air-supply volume is optimized 10～600 seconds, manually input on touch-screen; Boiler efficiency is optimized blind area span 0.1～2.0%, manually input on touch-screen; Optimize the manually input on touch-screen of step-length value;
Sampling period span described in the automatic optimization control method of above-mentioned boiler air-supply volume is 180～300 seconds, and it is 0.5～1.0% that boiler efficiency is optimized the blind area span.
Method of the present invention compared with prior art has following advantage: solved traditional coal-burning boiler air output in service and can't realize the automatically difficult problem of control, for the efficient operation of coal-burning boiler provides a kind of feasible technical solution.
Description of drawings
Fig. 1 is a controlling party block diagram of the present invention;
Fig. 2 is a coal-air ratio optimal control block diagram among the present invention;
Fig. 3 is a coal-air ratio principle of optimality schematic diagram among the present invention.
The specific embodiment
Consult shown in Figure 1, the automatic optimization control method of boiler air-supply volume of the present invention, be by real-time measurement boiler major parameter and Fuel Consumption, calculate the thermal efficiency of boiler, these data are delivered to a number type matrix sticks with paste in the adjuster and analyzes, the correct air output of regulating makes it progressively approach the best air output of actual condition.When the ratio (being the slope of the thermal efficiency and air output relation curve) of the variable quantity of the variable quantity of air output and the thermal efficiency hereinafter to be referred as slope greater than zero the time, illustrate that original air output change direction is correct, must continue by this direction adjusting air output; When slope less than zero the time, illustrate that original air output change direction is incorrect, must press rightabout adjusting air output; When slope equalled zero, the thermal efficiency reached the peak of actual condition, and promptly at this moment corresponding air output is exactly an optimum value.Because boiler working condition always constantly changes, therefore best air output also is constantly to change, must constantly be optimized adjusting, air output is always approached to optimum value, thereby keep the thermal efficiency of boiler to be always maintained at the optimum level that actual condition should reach.
Control method of the present invention is a pure ratio regulating system, and the size of air output mainly is the size according to actual coal-supplying amount, determines by coal-air ratio; Its key is how to determine that a best coal-air ratio guarantees that boiler combustion efficiency is the highest, has designed a coal-air ratio for this reason and has optimized link.
Setting coal-air ratio among the present invention is an empirical value, and manually input on touch-screen can be by formula: set coal-air ratio=air-supply frequency/actual coal-supplying amount, estimate, and also can be definite by test by following way:
(1) at about 1 hour than underrun, air-supply frequency Fd and coal-supplying amount Md that the normal postscript of boiler combustion is corresponding down;
(2) move about 1 hour in higher load, air-supply frequency Fg and coal-supplying amount Mg that the normal postscript of boiler combustion is corresponding down;
(3) set coal-air ratio=(Fg-Fd)/(Mg-Md) (degree of setting the approaching best coal-air ratio of coal-air ratio depends on the judgement that whether boiler combustion is reached optimum state).
For the ease of the manual intervention burning, also designed correction air output link, can when moving automatically, suitably regulate air output, revise air output by manually input on touch-screen.
In order to realize that unperturbed switches, control system of the present invention is undertaken from motion tracking by following algorithm:
During manual state: coal-air ratio optimization=0 (withdrawing from coal-air ratio optimization simultaneously);
Best coal-air ratio=setting coal-air ratio+coal-air ratio optimization;
Need air output=best coal-air ratio * actual coal-supplying amount;
Required airflow gathers=blows frequency;
Revise air output=required airflow and gather-need air output.
During auto state:
Best coal-air ratio=setting coal-air ratio+coal-air ratio optimization;
Need air output=best coal-air ratio * actual coal-supplying amount;
Revise air output=artificial setting value;
Required airflow gathers=needs air output+correction air output.
In the method for the present invention, differentiation element is pressed positive interaction work, must comprise that a proportional band is the ratio unit of 100% (multiplication factor is 1); The differential action has the characteristics of longer lag time to design at the burning of chain furnace, and purpose is to allow system that a certain amount of overshoot is arranged.
Consult shown in Figure 2ly, be that coal-air ratio of the present invention optimizes module, sampling period span wherein 10～600 seconds, preferably 180～300 seconds, can manually input on touch-screen; Boiler efficiency is optimized blind area Amq span 0.1～2.0%, and preferably 0.5～1.0%, can manually input on touch-screen; Optimize value manually input on touch-screen of step-length; Do not meet all situations of the condition of listing on the flow chart, do not change the numerical value that coal-air ratio is optimized; Renewal according to the sampling period sampling of setting, and is moved after the order in system operation back (no matter whether dropping into optimization).Coal-air ratio is optimized module and is wanted a window of independent design (changeable), is used to be provided with parameter, shows all operation results in the above-mentioned block diagram, optimizes ruuning situation so that grasp.
Consult shown in Figure 3ly, be coal-air ratio principle of optimality schematic diagram of the present invention, transverse axis is a coal-air ratio among the figure, and the longitudinal axis is a boiler efficiency, wherein: best coal-air ratio=setting coal-air ratio+coal-air ratio optimization.The ruuning situation on the left side is among the figure, current efficient A
0, a preceding efficient A
1, preceding twice efficient A
2, when step-length of coal-air ratio optimization increase, when promptly coal-air ratio increased, boiler efficiency improved; When reducing as if coal-air ratio on the contrary, boiler efficiency reduces.The ruuning situation on the right side is among the figure, current efficient A
0, a preceding efficient A
1, preceding twice efficient A
2, when coal-air ratio optimization reduces a step-length, when promptly coal-air ratio reduced, boiler efficiency improved; When increasing as if coal-air ratio on the contrary, boiler efficiency reduces.
Embodiment
Spin the chain furnace of four 35T/h of thermoelectric division department of group at Shuande, Fushan City, Guangdong Province gold, the lining adopts method of the present invention to carry out the automatic control of air output, sets coal-air ratio=0.6, and step-length=0.5 is optimized in sampling period=30 second; In use by the metering of coal amount and the metering of superheat steam flow, draw the thermal efficiency of boiler, adopt fireman's Artificial Control that more than 10 year operating experience arranged before comparing, the thermal efficiency has improved 2% at least, and economic benefit is fairly obvious.
Claims (7)
1. the automatic optimization control method of a boiler air-supply volume, it is characterized in that by real-time measurement boiler operating parameter and Fuel Consumption, calculate the thermal efficiency of boiler, these data are delivered in the digital Fuzzy Controller analyze, the correct air output of regulating makes it progressively approach the best air output of actual condition; When the ratio of the variable quantity of the variable quantity of air output and the thermal efficiency greater than zero the time, continue to regulate air output by this direction; When slope less than zero the time, press rightabout adjusting air output; When slope equalled zero, at this moment Dui Ying air output was exactly an optimum value.
2. the automatic optimization control method of boiler air-supply volume according to claim 1, the control method that it is characterized in that described digital Fuzzy Controller is, with boiler efficiency, coal-air ratio optimization, set coal-air ratio, best coal-air ratio, actual coal-supplying amount, need air output data inputs differentiation element, differentiation element output required airflow gathers, and passes to PID adjuster or the work of hand adjustment device control air-supply frequency converter after the artificial correction air output correction that is provided with; When manual state: coal-air ratio optimization=0, best coal-air ratio=setting coal-air ratio+coal-air ratio optimization needs air output=best coal-air ratio * actual coal-supplying amount, and required airflow gathers=blows frequency, revises air output=required airflow and gathers-need air output; When auto state: best coal-air ratio=setting coal-air ratio+coal-air ratio optimization, need air output=best coal-air ratio * actual coal-supplying amount, revise air output=artificial setting value, required airflow gathers=needs air output+correction air output.
3. the automatic optimization control method of boiler air-supply volume according to claim 2 is characterized in that described differentiation element by positive interaction work, comprises that a proportional band is 100% ratio unit.
4. the automatic optimization control method of boiler air-supply volume according to claim 2 is characterized in that described setting coal-air ratio can be according to formula: set coal-air ratio=air-supply frequency/actual coal-supplying amount, estimate or definite by following test:
(1) at about 1 hour than underrun, air-supply frequency Fd and coal-supplying amount Md that the normal postscript of boiler combustion is corresponding down;
(2) move about 1 hour in higher load, air-supply frequency Fg and coal-supplying amount Mg that the normal postscript of boiler combustion is corresponding down;
(3) set coal-air ratio=(Fg-Fd)/(Mg-Md), manually input on touch-screen.
5. the automatic optimization control method of boiler air-supply volume according to claim 2 is characterized in that described correction air output is manually input on touch-screen.
6. the automatic optimization control method of boiler air-supply volume according to claim 2 is characterized in that the sampling period span of described coal-air ratio in optimizing 10～600 seconds, manually input on touch-screen; Boiler efficiency is optimized blind area span 0.1～2.0%, manually input on touch-screen; Optimize the manually input on touch-screen of step-length value;
7. the automatic optimization control method of boiler air-supply volume according to claim 6 is characterized in that described sampling period span is 180～300 seconds, and it is 0.5～1.0% that boiler efficiency is optimized the blind area span.
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| CN101334172B (en) * | 2008-07-28 | 2010-06-16 | 柴庆宣 | Middle powder storage house type pulverized coal boiler draft air intelligent control method |
| CN102853419A (en) * | 2012-08-29 | 2013-01-02 | 北京和隆优化控制技术有限公司 | Intelligent optimization control system of pulverized coal furnace |
| CN103225820A (en) * | 2013-05-13 | 2013-07-31 | 北京和隆优化科技股份有限公司 | Chain grate furnace combustion optimization control system |
| CN104110696A (en) * | 2013-04-16 | 2014-10-22 | 沈阳铝镁设计研究院有限公司 | Combustion air automatic adjusting method for pot type furnace |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
| CN104848251A (en) * | 2015-05-07 | 2015-08-19 | 华电能源股份有限公司哈尔滨第三发电厂 | Oxygen content control system of coal-fired boiler |
| CN105042588A (en) * | 2015-08-27 | 2015-11-11 | 长安大学 | Method for determining air-oil ratio of drying barrel combustor of bituminous mixture mixing equipment |
| CN105157056A (en) * | 2015-07-03 | 2015-12-16 | 杭州和利时自动化有限公司 | Method for determining total air quantity of boiler combustion system |
| CN107016176A (en) * | 2017-03-24 | 2017-08-04 | 杭州电子科技大学 | A kind of hybrid intelligent overall boiler burning optimization method |
| CN107191964A (en) * | 2017-06-20 | 2017-09-22 | 广东电网有限责任公司电力科学研究院 | A kind of method and device of the quick optimal-search control of Thermal generation unit First air |
| CN111443157A (en) * | 2020-03-16 | 2020-07-24 | 京威汽车设备有限公司 | Heater combustion test system and method |
| CN111520707A (en) * | 2020-06-23 | 2020-08-11 | 杭州和利时自动化有限公司 | Method, system and device for controlling air quantity of circulating fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101334172B (en) * | 2008-07-28 | 2010-06-16 | 柴庆宣 | Middle powder storage house type pulverized coal boiler draft air intelligent control method |
| CN102853419A (en) * | 2012-08-29 | 2013-01-02 | 北京和隆优化控制技术有限公司 | Intelligent optimization control system of pulverized coal furnace |
| CN104110696A (en) * | 2013-04-16 | 2014-10-22 | 沈阳铝镁设计研究院有限公司 | Combustion air automatic adjusting method for pot type furnace |
| CN103225820A (en) * | 2013-05-13 | 2013-07-31 | 北京和隆优化科技股份有限公司 | Chain grate furnace combustion optimization control system |
| CN103225820B (en) * | 2013-05-13 | 2015-05-13 | 北京和隆优化科技股份有限公司 | Chain grate furnace combustion optimization control system |
| CN104676638A (en) * | 2015-01-14 | 2015-06-03 | 冉启发 | Method of controlling low-nitrogen combustion damper in load-down process of boiler |
| CN104676638B (en) * | 2015-01-14 | 2017-07-04 | 冉启发 | A kind of low nitrogen burning control method for air door during boiler load down |
| CN104848251A (en) * | 2015-05-07 | 2015-08-19 | 华电能源股份有限公司哈尔滨第三发电厂 | Oxygen content control system of coal-fired boiler |
| CN105157056A (en) * | 2015-07-03 | 2015-12-16 | 杭州和利时自动化有限公司 | Method for determining total air quantity of boiler combustion system |
| CN105157056B (en) * | 2015-07-03 | 2018-09-18 | 杭州和利时自动化有限公司 | A kind of method of the total blast volume of determining boiler combustion system |
| CN105042588A (en) * | 2015-08-27 | 2015-11-11 | 长安大学 | Method for determining air-oil ratio of drying barrel combustor of bituminous mixture mixing equipment |
| CN107016176A (en) * | 2017-03-24 | 2017-08-04 | 杭州电子科技大学 | A kind of hybrid intelligent overall boiler burning optimization method |
| CN107191964A (en) * | 2017-06-20 | 2017-09-22 | 广东电网有限责任公司电力科学研究院 | A kind of method and device of the quick optimal-search control of Thermal generation unit First air |
| CN111443157A (en) * | 2020-03-16 | 2020-07-24 | 京威汽车设备有限公司 | Heater combustion test system and method |
| CN111520707A (en) * | 2020-06-23 | 2020-08-11 | 杭州和利时自动化有限公司 | Method, system and device for controlling air quantity of circulating fluidized bed boiler |
| WO2022142321A1 (en) * | 2020-12-30 | 2022-07-07 | 江苏海洋大学 | Air volume control method suitable for pulverized coal boiler |
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