CN101608798A - Method for controlling air-fuel ratio of hot blast furnace - Google Patents
Method for controlling air-fuel ratio of hot blast furnace Download PDFInfo
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- CN101608798A CN101608798A CNA2009101042710A CN200910104271A CN101608798A CN 101608798 A CN101608798 A CN 101608798A CN A2009101042710 A CNA2009101042710 A CN A2009101042710A CN 200910104271 A CN200910104271 A CN 200910104271A CN 101608798 A CN101608798 A CN 101608798A
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Abstract
The present invention relates to method for controlling air-fuel ratio of hot blast furnace, its step has: one, coal gas and air mass flow collection value are carried out preliminary treatment: the coal gas, the air mass flow value that earlier flowmeter are collected are converted into floating number, again the floating number value filtering is handled, carried out temperature, pressure compensation at last; Two, air-fuel ratio operation mode and burning control flow set: utilize computer programming to determine that the air-fuel ratio operation mode deciding the coal gas program, deciding the air program or regulate separately in three kinds of modes of program and select; Three, coal gas PID inner setting value and the air PID inner setting value of determining according to previous step carried out the PID adjusting to coal gas and air by existing mode respectively.After adopting the present invention, easy to operate, avoided loaded down with trivial details operation, labour intensity obviously descends.Even coal gas has big fluctuation, also more satisfactory to the control of air-fuel ratio, burn the efficiency of furnace and significantly improve, solved the problem that existing " regulating separately " brings fully.
Description
Technical field
The present invention relates to the control method of air-fuel ratio in the smelting industry Combustion of Hot Air Furnace process.
Background technology
The Combustion of Hot Air Furnace process mainly is divided into two stages: the one, and improve the wind-warm syndrome stage fast in early stage; The 2nd, the later stage keeps the wind-warm syndrome stage.No matter in that stage, Combustion of Hot Air Furnace all needs to control well the ratio (being air-fuel ratio) of air and combustion gas (referring to coal gas here), and only under suitable ratio, burning could fully just can make full use of the calorific value of coal gas.In the prior art, the control of hot-blast stove air-fuel ratio mainly uses " regulating separately " mode to carry out, operating personnel are according to the behaviour's stove experience of oneself, by PID (ratio, integration, differential) closed-loop control function, coal gas and air control valve valve position are carried out hand/regulate automatically respectively, and the control flow is in the hope of reaching and keeping comparatively ideal air-fuel ratio, finish whole burning stove process, for blast furnace process provides hot blast.Mainly there is following drawback in this method:
1, operating personnel's level is uneven, and only operation has significant limitation by rule of thumb;
2, at different burning heater stages, in order to keep an air-fuel ratio preferably, operating personnel need frequently be provided with the flow of coal gas and air, have strengthened operating personnel's workload;
3, if coal gas have the fluctuation situation, just can not be more stable the flow-control of coal gas and air at optimum, promptly to guarantee one preferably air-fuel ratio also be the comparison difficulty.
Summary of the invention
At the prior art above shortcomings, the object of the present invention is to provide a kind of easy to operate, air-fuel ratio to keep comparatively ideal method for controlling air-fuel ratio of hot blast furnace.
The object of the present invention is achieved like this: method for controlling air-fuel ratio of hot blast furnace is characterized in that: it comprises following operating procedure:
(1) coal gas and air mass flow collection value are carried out preliminary treatment:
(1) gather coal gas, air mass flow value respectively by flowmeter, the analog quantity that flowmeter is obtained is converted to digital quantity by computer simulation amount input template, and the digital quantity of data type WORD is converted into floating number OUT1;
Wherein, IN1 is the digital quantity that computer simulation amount input template converts to, and upper and lower bound is respectively the higher limit and the lower limit of flowmeter range;
(2) coal gas, air floating number value filtering are handled, eliminated and disturb peak value, make the flow curve of coal gas and air become level and smooth;
(3) filtered coal gas, air mass flow value are carried out temperature, pressure compensation, the temperature and pressure in flow collection zone is taken into account, the flow value after the feasible compensation is more near actual value;
(wherein, P
ActualBe air or coal gas observed pressure; P
Standard=1.01325 * 10
2KPa; T
ActualBe air or coal gas observed temperature, T
Standard=273K; P
CompensationAnd T
CompensationBe the pressure and temperature offset, indicate that directly the above-mentioned formula of substitution gets final product at concrete flowmeter parameter list; )
(2) air-fuel ratio operation mode and burning control flow set
Utilize computer programming to determine that the air-fuel ratio operation mode deciding the coal gas program, deciding the air program or regulate separately in three kinds of modes of program and select,
If decide the coal gas program, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Gas flow * air-fuel ratio=air mass flow setting value
Air mass flow setting value=air PID inner setting value
If decide the air program, then respective function is:
Air mass flow setting value=air PID inner setting value
Gas flow setting value=coal gas PID inner setting value
If regulate program separately, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Air mass flow setting value=air PID inner setting value
(3) coal gas PID inner setting value of determining according to previous step and air PID inner setting value are carried out PID to coal gas and air by existing mode respectively and regulated: the PID that the PID inner setting value of coal gas and air is sent into coal gas and air respectively regulates in the program block, and by to coal gas and air PID program parameter: MAN_ON, MAN, GAIN, TI, TD, DEADB_W, LMN_HLM, LMN_LLM and LMN_PER are provided with realization PID regulatory function.
After adopting the present invention, easy to operate, operating personnel's mode of operation selects face bigger, can choose which kind of mode of operation flexibly according to the traffic conditions of coal gas/air, has avoided loaded down with trivial details operation, and labour intensity obviously descends.Even coal gas has big fluctuation, also more satisfactory to the control of air-fuel ratio, burn the efficiency of furnace and significantly improve, solved the problem that existing " regulating separately " brings fully.
Description of drawings
Fig. 1-air-fuel ratio operation mode flow chart of the present invention;
Fig. 2-PID of the present invention regulates flow chart.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
Method for controlling air-fuel ratio of hot blast furnace of the present invention, it comprises following operating procedure:
(1) coal gas and air mass flow collection value are carried out preliminary treatment, to reach exact value;
(1) gathers coal gas, air mass flow value respectively by field instrument-gas flow meter and mass air flow sensor, the analog quantity (its output valve is the analog signal of 4-20mA in one embodiment) that flowmeter is obtained is converted to digital quantity (being analog-to-digital conversion) by computer simulation amount input template, and data type WORD (being digital quantity) is converted into floating number OUT1 by statement ITD, DTR;
Wherein, IN1 is the digital quantity that computer simulation amount input template converts to, and upper and lower bound is respectively the higher limit and the lower limit of flowmeter range;
(2) coal gas, air floating-point numerical value OUT1 filtering are handled, eliminated and disturb peak value, make the flow curve of coal gas and air become level and smooth;
(3) filtered coal gas, air mass flow value OUT2 are carried out temperature, pressure compensation, the temperature and pressure in flow collection zone is taken into account, the flow value after the feasible compensation is more near actual value;
(wherein, P
ActualBe air or coal gas observed pressure; P
Standard=1.01325 * 10
2KPa; T
ActualBe air or coal gas observed temperature, T
Standard=273K; P
CompensationAnd T
CompensationBe the pressure and temperature offset, indicate that directly the above-mentioned formula of substitution gets final product at concrete flowmeter parameter list; )
Handled coal gas and the air mass flow value to obtain more near actual value by the last step, for follow-up accurate control lays the first stone.
(2) air-fuel ratio operation mode and burning control flow set
Utilize computer programming to determine three kinds of modes of operation of air-fuel ratio, promptly decide the coal gas program, decide the air program or regulate program separately, mode of operation is selected in these three kinds of modes, and air-fuel ratio operation mode flow chart is seen Fig. 1.
If what select is to decide the coal gas program, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Gas flow * air-fuel ratio=air mass flow setting value
Air mass flow setting value=air PID inner setting value
If what select is to decide the air program, then respective function is:
Air mass flow setting value=air PID inner setting value
Gas flow setting value=coal gas PID inner setting value
Therefore in last two kinds of control modes, in case coal gas/air mass flow determines that corresponding air/gas flow set is just planted and determined automatically, promptly air/gas PID inner setting value is determined.
If what select is the program of regulating separately, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Air mass flow setting value=air PID inner setting value
(3) coal gas PID inner setting value of determining according to previous step and air PID inner setting value are carried out PID to coal gas and air respectively and are regulated and get final product, this part PID internal regulation is undertaken by existing mode, it is as follows that PID regulates flow algorithm: the PID that the PID inner setting value of coal gas and air is sent into coal gas and air respectively regulates in the program block, and by to coal gas and air PID program parameter: MAN_ON, MAN, GAIN, TI, TD, DEADB_W, LMN_HLM, LMN_LLM, being provided with of LMN_PER are realized PID regulatory function (its adjusting flow process is seen Fig. 2).
Regulate by PID:
When 1) deciding coal gas, can be by manually, dual mode be realized the closed-loop adjustment to coal gas automatically, promptly manually directly regulate the valve position (0%～100%) of coal gas, automatically according to the valve position of flow (REAL) adjusting coal gas; Air is then according to function:
Gas flow * air-fuel ratio=air setting value
Air setting value=air PID inner setting value
And then, make the air mass flow automated closed-loop regulate according to air PID program.
When 2) deciding air, also can be by manually, dual mode be realized regulating air automatically, promptly manually directly regulate the valve position (0%～100%) of air, automatically according to the valve position of flow (REAL) adjusting air; Coal gas is then according to function:
Coal gas setting value=coal gas PID inner setting value
And then, make the gas flow automated closed-loop regulate according to coal gas PID program.
When 3) regulating separately,, independently carry out PID separately and regulate by valve position and the flow that coal gas and air are set.
This control method is after the enterprises operation, and the technologist reflects that generally labour intensity descends, burns the efficiency of furnace and significantly improves, and has solved the problem that " regulating separately " brings fully.
Claims (2)
1, method for controlling air-fuel ratio of hot blast furnace is characterized in that: it comprises following operating procedure:
(1) coal gas and air mass flow collection value are carried out preliminary treatment:
(1) gather coal gas, air mass flow value respectively by flowmeter, the analog quantity that flowmeter is obtained is converted to digital quantity by computer simulation amount input template, and the digital quantity of data type WORD is converted into floating number OUT1;
Wherein, IN1 is the digital quantity that computer simulation amount input template converts to, and upper and lower bound is respectively the higher limit and the lower limit of flowmeter range;
(2) coal gas, air floating number value filtering are handled, and eliminate and disturb peak value, make the flow curve of coal gas and air become level and smooth;
(3) filtered coal gas, air mass flow value are carried out temperature, pressure compensation, the temperature and pressure in flow collection zone is taken into account, the flow value after the feasible compensation is more near actual value;
(wherein, P
ActualBe air or coal gas observed pressure; P
Standard=1.01325 * 10
2KPa; T
ActualBe air or coal gas observed temperature; T
Standard=273K; P
CompensationAnd T
CompensationBe pressure compensation value and the temperature compensation value on the flowmeter parameter list; )
(2) air-fuel ratio operation mode and burning control flow set
Utilize computer programming to determine that the air-fuel ratio operation mode deciding the coal gas program, deciding the air program or regulate separately in three kinds of modes of program and select,
If decide the coal gas program, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Gas flow * air-fuel ratio=air mass flow setting value
Air mass flow setting value=air PID inner setting value
If decide the air program, then respective function is:
Air mass flow setting value=air PID inner setting value
Gas flow setting value=coal gas PID inner setting value
If regulate program separately, then respective function is:
Gas flow setting value=coal gas PID inner setting value
Air mass flow setting value=air PID inner setting value
(3) coal gas PID inner setting value and the air PID inner setting value of determining according to previous step carried out the PID adjusting to coal gas and air respectively.
2, method for controlling air-fuel ratio of hot blast furnace according to claim 1, it is characterized in that: described (three) step carries out the method that PID regulates to coal gas and air and is: the PID that the PID inner setting value of coal gas and air is sent into coal gas and air respectively regulates in the program block, and by to coal gas and air PID program parameter: MAN_ON, MAN, GAIN, TI, TD, DEADB_W, LMN_HLM, LMN_LLM and LMN_PER are provided with realization PID regulatory function.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101042710A CN101608798B (en) | 2009-07-07 | 2009-07-07 | Method for controlling air-fuel ratio of hot blast furnace |
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|---|---|---|---|
| CN2009101042710A CN101608798B (en) | 2009-07-07 | 2009-07-07 | Method for controlling air-fuel ratio of hot blast furnace |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893238A (en) * | 2010-07-29 | 2010-11-24 | 郑治原 | Intelligent and energy-saving control system of ceramic kiln and control method thereof |
| CN102748774A (en) * | 2012-07-17 | 2012-10-24 | 中昊晨光化工研究院有限公司 | Burning furnace, burning control method and burning control device |
| CN103712433A (en) * | 2014-01-02 | 2014-04-09 | 中联重科股份有限公司 | Dry-mixed mortar mixing station and combustion control method and device of drying system of dry-mixed mortar mixing station |
| CN105020886A (en) * | 2015-08-19 | 2015-11-04 | 哈尔滨世纪热风炉灶有限公司 | Automatic control equipment of hot air kitchen range utilizing solar energy for power generation |
| CN105423334A (en) * | 2015-12-31 | 2016-03-23 | 中冶南方工程技术有限公司 | Intelligent control system and method for combustion process of hot-blast stove |
| CN110306017A (en) * | 2019-07-17 | 2019-10-08 | 首钢京唐钢铁联合有限责任公司 | Annealing furnace proportion control type burner air-fuel ratio control method and system |
| CN112557075A (en) * | 2020-11-27 | 2021-03-26 | 奇瑞汽车股份有限公司 | Starter durability test method and device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5316927A (en) * | 1976-07-30 | 1978-02-16 | Kawasaki Heavy Ind Ltd | Automatic combustion control system for fuel |
| US4489375A (en) * | 1982-04-12 | 1984-12-18 | Westinghouse Electric Corp. | Industrial process control apparatus and method |
| CN1219667A (en) * | 1997-12-11 | 1999-06-16 | 重庆钢铁集团电子有限责任公司 | Optimization seeking method for air-fuel ratio |
| CN100371462C (en) * | 2005-05-26 | 2008-02-27 | 河北理工大学 | Blast furnace hot-blast stove combustion automatic control method based on example inference |
| CN101408314B (en) * | 2008-03-19 | 2010-06-23 | 首钢总公司 | Automatic control system of blast furnace hot blast stove combustion process |
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2009
- 2009-07-07 CN CN2009101042710A patent/CN101608798B/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893238A (en) * | 2010-07-29 | 2010-11-24 | 郑治原 | Intelligent and energy-saving control system of ceramic kiln and control method thereof |
| CN101893238B (en) * | 2010-07-29 | 2012-05-30 | 郑治原 | Intelligent and energy-saving control system of ceramic kiln and control method thereof |
| CN102748774A (en) * | 2012-07-17 | 2012-10-24 | 中昊晨光化工研究院有限公司 | Burning furnace, burning control method and burning control device |
| CN102748774B (en) * | 2012-07-17 | 2015-05-13 | 中昊晨光化工研究院有限公司 | Burning furnace, burning control method and burning control device |
| CN103712433A (en) * | 2014-01-02 | 2014-04-09 | 中联重科股份有限公司 | Dry-mixed mortar mixing station and combustion control method and device of drying system of dry-mixed mortar mixing station |
| CN103712433B (en) * | 2014-01-02 | 2015-12-02 | 中联重科股份有限公司 | Dry-mixed mortar mixing station and combustion control method and device of drying system of dry-mixed mortar mixing station |
| CN105020886A (en) * | 2015-08-19 | 2015-11-04 | 哈尔滨世纪热风炉灶有限公司 | Automatic control equipment of hot air kitchen range utilizing solar energy for power generation |
| CN105423334A (en) * | 2015-12-31 | 2016-03-23 | 中冶南方工程技术有限公司 | Intelligent control system and method for combustion process of hot-blast stove |
| CN105423334B (en) * | 2015-12-31 | 2017-11-21 | 中冶南方工程技术有限公司 | Combustion of Hot Air Furnace Intelligent Process Control system and method |
| CN110306017A (en) * | 2019-07-17 | 2019-10-08 | 首钢京唐钢铁联合有限责任公司 | Annealing furnace proportion control type burner air-fuel ratio control method and system |
| CN110306017B (en) * | 2019-07-17 | 2021-04-23 | 首钢京唐钢铁联合有限责任公司 | Annealing furnace proportion control type burner air-fuel ratio control method and system |
| CN112557075A (en) * | 2020-11-27 | 2021-03-26 | 奇瑞汽车股份有限公司 | Starter durability test method and device |
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Application publication date: 20091223 Assignee: Electronics Co., Ltd., Chongqing Iron and Steel Group Assignor: Chongqing Iron & Steel (Group) Co., Ltd. Contract record no.: 2013500000043 Denomination of invention: Method for controlling air-fuel ratio of hot blast furnace Granted publication date: 20110105 License type: Exclusive License Record date: 20130527 |
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