CN103256623B - Method for flexibly controlling air excess coefficient of impulse burner - Google Patents
Method for flexibly controlling air excess coefficient of impulse burner Download PDFInfo
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- CN103256623B CN103256623B CN201210038147.0A CN201210038147A CN103256623B CN 103256623 B CN103256623 B CN 103256623B CN 201210038147 A CN201210038147 A CN 201210038147A CN 103256623 B CN103256623 B CN 103256623B
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Abstract
The invention discloses a method for flexibly controlling the air excess coefficient of an impulse burner. The air-fuel ratio of a whole impulse heating furnace is controlled according to manifold air and gas pressure in three modes: 1) a low-temperature mode; 2) a high-temperature non-full load mode; and 3) a high-temperature full load mode. In the low-temperature mode, the furnace temperature is lower than 800 DEG C, the whole furnace is controlled, and the opening time of a gas cut-off valve is as same as that of an air cut-off valve. In the high-temperature non-full load mode, the furnace temperature is higher than or equal to 800 DEG C, the demand on heat load is lower than or equal to 90%, the gas cut-off valve is controlled to delay opening time sequence and time when the air excess coefficient is larger than 1, and the air cut-off valve is controlled to bring opening time sequence and time forward when the air excess coefficient is smaller than 1. In the high-temperature full load mode, the furnace temperature is higher than or equal to 800 DEG C, the demand on the heat load is higher than 90%, the opening time sequence and time of the gas cut-off valve is forcedly controlled when the air excess coefficient is larger than 1, and the opening time sequence and time of the air cut-off valve is forcedly controlled when the air excess coefficient is smaller than 1. The air excess coefficient of each impulse area of the impulse heating furnace can be automatically and stably controlled.
Description
Technical field
The present invention relates to a kind of plate slab pulse heating furnace combustion technology, particularly relate to a kind of method of flexible control impuls burner coefficient of excess air.
Background technology
Coefficient of excess air is an important controling parameters in heating furnace combustion process, it refers to the air capacity of effective supply and the ratio of theoretical demand air capacity, and it has very important impact to the heating surface quality of slab, oxidization burning loss, sufficient combustion.Current domestic many steel mills use pulse heating furnace in newly-built or transformation, transform original conventional heating technique as pulse combustion technology.Because pulse heating furnace combustion system only has house steward empty, the pressure-regulating valve of coal gas carries out sky, the adjustment of gas pressure, and it is not free in each control section as traditional heating stove, gas flow control valve, the air-fuel ratio to full stove (referring to the ratio of air capacity when ensureing theoretical Thorough combustion and coal gas amount) can only be taked at present to regulate, namely by empty to house steward, the control of coal gas pressure regulator valve carries out same air-fuel ration control to all impulse burners of full stove, therefore the coefficient of excess air for each impulse burner can not carry out accurate method of controlling.And each section of flow control valve although some pulse heating furnaces remaining traditional heating stove carries out sky, gas flow regulates, but the coal gas after each section of flow control valve that this method is subject to the fluctuation of house steward's gas pressure, pulse-combustion characteristic causes and air pressure fluctuation, its air-fuel ration control, especially the control of coefficient of excess air also cannot accurately respond fast, thus have impact on different cultivars steel diverse location in stove and, to the demand of air excess amount, and hinder the control flexibility of pulse heating furnace.
Domestic and international many steel mills are strengthening using the reducing energy consumption of hot-rolling heating furnace or new power-saving technology, pulse-combustion is effective power-saving technology of using of heavy slab heating furnace in recent years, and how effectively promotes the control flexibility of pulse heating furnace coefficient of excess air and control accuracy is the common difficulty that everybody faces.
Summary of the invention
The object of the present invention is to provide a kind of method of flexible control impuls burner coefficient of excess air, the coefficient of excess air automatic stabilisation that the method can realize each pulse area of pulse heating furnace controls, and improves the air-fuel ration control flexibility in pulse Lu Ge district.
The present invention is achieved in that
A method for flexible control impuls burner coefficient of excess air, controls the air-fuel ratio of full stove at pulse heating furnace with house steward's air, house steward's gas pressure, has Three models:
1) low temperature mode, furnace temperature < 800 DEG C,
Full stove is adopted to control, the regulative mode that coal gas is identical with the air cutoff valve opening time; The burner stop valve opening time is: the air cutoff valve opening time, Tair equaled burner working time Tw, and gas cutting valve opening time Tgas equals air cutoff valve opening time Tair, that is: Tair=Tw, Tgas=Tair; The gas stop valve delay opening time equals zero, i.e. Tgas_dly=0;
2) high temperature mode is at full capacity non-, furnace temperature >=800 DEG C and thermal load demands≤90% state,
When coefficient of excess air is greater than 1, control gas stop valve to postpone to open sequential and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, that is: Tgas=Tw, Tair=Tgas × k; Gas stop valve delay opening time Tgas_on equals air cutoff valve opening time Tair and deducts gas cutting valve opening time Tgas, that is: Tgas_on=Tair-Tgas;
When coefficient of excess air is less than 1, the sequential that control air cutoff valve is closed in advance and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, i.e. Tgas=Tw, Tair=Tgas × k; Air cutoff valve shifts to an earlier date shut-in time Tair_off and equals gas cutting valve opening time Tgas and deduct air cutoff valve opening time Tair, that is: Tair_off=Tgas-Tair;
3) high temperature mode is at full capacity, furnace temperature >=800 DEG C and thermal load demands > 90% state,
When coefficient of excess air is greater than 1, force unlatching sequential and the time of gas stop valve, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force gas stop valve to shift to an earlier date shut-in time Tgas_off is: Tgas_off=│ 1-k │ × T × n;
When coefficient of excess air is less than 1, air cutoff valve is forced to open sequential and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force air cutoff valve to shift to an earlier date shut-in time Tair_off is: Tair_off=│ 1-k │ × T × n.
Under high temperature mode full load condition, described coefficient of excess air k is applicable to 0.9 to 1.1.
The present invention is under the prerequisite of pulse-combustion technique, to propose under three kinds of different situations the different Control timing sequence of air before impulse burner, gas stop valve and the pattern of time, the coefficient of excess air automatic stabilisation realizing each pulse area of pulse heating furnace controls, improve the air-fuel ration control flexibility in pulse Lu Ge district, realize the combustion efficiency required by pulse-combustion technique, guarantee the stability and high efficiency that pulse heating furnace burns, for the effect of pulse combustion technology on heavy slab heating furnace provides condition.
Accompanying drawing explanation
Fig. 1 is the control method flow chart of the present invention's flexible control impuls burner coefficient of excess air.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
See Fig. 1, a kind of method of flexible control impuls burner coefficient of excess air, the air-fuel ratio of full stove is controlled with house steward's air, house steward's gas pressure at pulse heating furnace, in actual production process, some variety steel has different coefficient of excess air setting requirements to slab diverse location in stove, and the method controlling impulse burner coefficient of excess air in pulse heating furnace has Three models:
1) low temperature mode, furnace temperature < 800 DEG C, under low temperature mode situation only occurs in baker or the empty stove situation of large periodical repair, therefore to coefficient of excess air no requirement (NR), thus empty, the gas-fired time is identical.
Under low temperature mode, full stove is adopted to control, the regulative mode that coal gas is identical with the air cutoff valve opening time; Burner stop valve opening time (s) is: the air cutoff valve opening time, Tair equaled burner working time Tw, and gas cutting valve opening time Tgas equals air cutoff valve opening time Tair, that is: Tair=Tw, Tgas=Tair; Gas stop valve delay opening time (s) equals zero, i.e. Tgas_dly=0.
2) high temperature mode is at full capacity non-, furnace temperature >=800 DEG C and thermal load demands≤90% state,
Due under the non-full load situation of high temperature mode, corresponding gas stop valve, air cutoff valve are not open in the complete period in one-period, in one-period, therefore have enough delay opening times to ensure the realization of coefficient of excess air.When coefficient of excess air is greater than 1, the opening time of gas stop valve need be postponed in each combustion period.When coefficient of excess air is less than 1, the shut-in time of air cutoff valve need be shifted to an earlier date in each combustion period.Specifically:
When coefficient of excess air is greater than 1, control gas stop valve to postpone to open sequential and time, burner stop valve opening time (s) is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, that is: Tgas=Tw, Tair=Tgas × k; Gas stop valve delay opening time Tgas_on equals air cutoff valve opening time Tair and deducts gas cutting valve opening time Tgas, that is: Tgas_on=Tair-Tgas;
When coefficient of excess air is less than 1, the sequential that control air cutoff valve is closed in advance and time, burner stop valve opening time (s) is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, i.e. Tgas=Tw, Tair=Tgas × k; Air cutoff valve shifts to an earlier date shut-in time Tair_off and equals gas cutting valve opening time Tgas and deduct air cutoff valve opening time Tair, that is: Tair_off=Tgas-Tair
3) high temperature mode at full capacity, in furnace temperature >=800 DEG C and thermal load demands > 90% state
Due under high temperature mode full load situation, corresponding gas stop valve, air cutoff valve are open in the complete period in one-period, therefore no matter for gas stop valve or air cutoff valve, in one-period, enough delay opening times are not had to ensure the requirement of coefficient of excess air.In order to ensure coefficient of excess air be greater than 1 or be less than 1 setting demand, carry out compulsory closedown to ensure in n combustion period to gas stop valve or air cutoff valve respectively.Namely, when coefficient of excess air is greater than 1, every n cycle is not forced to close gas stop valve in advance.When coefficient of excess air is less than 1, every n cycle is not forced to close air cutoff valve in advance.And in order to the combustion completion in stove, coefficient of excess air k is herein applicable to 0.9 to 1.1, the time of closing in advance is namely forced all to control within the regular hour (calculated with 60 seconds scan periods, this time is │ 1-k │ × T × n second).Specifically:
When coefficient of excess air is greater than 1, force unlatching sequential and the time of gas stop valve, burner stop valve opening time (s) is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force gas stop valve to shift to an earlier date shut-in time Tgas_off is: Tgas_off=│ 1-k │ × T × n;
When coefficient of excess air is less than 1, force unlatching sequential and the time of air cutoff valve, burner stop valve opening time (s) is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force air cutoff valve to shift to an earlier date shut-in time Tair_off is: Tair_off=│ 1-k │ × T × n;
Wherein:
Tw: burner working time (equaling the scan period under full load situation);
K: coefficient of excess air;
T: burning scan period;
N: force the combustion period number of closing in advance.
Embodiment
Have in pulse heating furnace
onecriticize steel grade and require reducing atmosphere, namely need coefficient of excess air to be less than 1.After this batch of steel enters the first bringing-up section, operating personnel are by the coefficient of excess air k of technological requirement setting correspondence, and such as reproducibility gas part is 0.95.At this moment heating furnace is according to the method for flexible control impuls burner coefficient of excess air of the present invention, the automatic high/low temperature pattern according to impulse burner and load condition thereof judge, if be now the non-combustion case at full capacity of high temperature mode, one then in corresponding method of the present invention: the non-fired state at full capacity of high temperature mode, when coefficient of excess air is less than 1, the sequential that control air cutoff valve is closed in advance and time, burner stop valve opening time (s): Tgas=Tw, Tair=Tgas × k, air cutoff valve shifts to an earlier date the pattern of shut-in time Tair_off=Tgas-Tair,
Now, get burner working time Tw=48 second, then the opening time Tgas=Tw=48 second of gas stop valve, air cutoff valve opening time Tair=Tgas × k=48 × 0.95=45.6 second; Then in order to ensure reducing atmosphere, air cutoff valve is closed in advance, and the time shifted to an earlier date is Tair_off=Tgas-Tair=48-45.6=2.4 second.
If along with the quickening of rhythm of production, when heating furnace becomes high temperature mode full load situation, one then in corresponding method of the present invention: high temperature mode is fired state at full capacity, when coefficient of excess air is less than 1, air cutoff valve is forced to open sequential and time, burner stop valve opening time (s): Tgas=Tw, Tair=Tw, every n cycle does not force air cutoff valve to shift to an earlier date the pattern of shut-in time Tair_off=│ 1-k │ × T × n;
Now, get burning scan period T=60 second, force the combustion period n=2 closed in advance, then the opening time Tgas=Tw=T=60 second of gas stop valve, air cutoff valve opening time Tgas=Tw=T=60 second; In order to ensure reducing atmosphere, air cutoff valve is forced to close in advance in every 2 cycles, and the time shifted to an earlier date is Tair_off=│ 1-k │ × T × n=│ 1-0.95 │ × 60 × 2=6 seconds.
These are only preferred embodiment of the present invention, be not intended to limit the protection domain of invention, therefore, all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a method for flexible control impuls burner coefficient of excess air, controls the air-fuel ratio of full stove at pulse heating furnace with house steward's air, house steward's gas pressure, it is characterized in that: have Three models:
1) low temperature mode, furnace temperature < 800 DEG C,
Full stove is adopted to control, the regulative mode that coal gas is identical with the air cutoff valve opening time; The burner stop valve opening time is: the air cutoff valve opening time, Tair equaled burner working time Tw, and gas cutting valve opening time Tgas equals air cutoff valve opening time Tair, that is: Tair=Tw, Tgas=Tair; The gas stop valve delay opening time equals zero, i.e. Tgas_dly=0;
2) high temperature mode is at full capacity non-, furnace temperature >=800 DEG C and thermal load demands≤90% state,
When coefficient of excess air is greater than 1, control gas stop valve to postpone to open sequential and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, that is: Tgas=Tw, Tair=Tgas × k; Gas stop valve delay opening time Tgas_on equals air cutoff valve opening time Tair and deducts gas cutting valve opening time Tgas, that is: Tgas_on=Tair-Tgas;
When coefficient of excess air is less than 1, the sequential that control air cutoff valve is closed in advance and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, air cutoff valve opening time Tair equals gas cutting valve opening time Tgas and is multiplied by coefficient of excess air k, i.e. Tgas=Tw, Tair=Tgas × k; Air cutoff valve shifts to an earlier date shut-in time Tair_off and equals gas cutting valve opening time Tgas and deduct air cutoff valve opening time Tair, that is: Tair_off=Tgas-Tair;
3) high temperature mode is at full capacity, furnace temperature >=800 DEG C and thermal load demands > 90% state,
When coefficient of excess air is greater than 1, force unlatching sequential and the time of gas stop valve, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force gas stop valve to shift to an earlier date shut-in time Tgas_off is: Tgas_off=│ 1-k │ × T × n;
When coefficient of excess air is less than 1, air cutoff valve is forced to open sequential and time, the burner stop valve opening time is: gas cutting valve opening time Tgas equals burner working time Tw, also the scan period T that burns is equaled, the air cutoff valve opening time, Tair equaled burner working time Tw, also the scan period T that burns is equaled, that is: Tgas=Tw=T, the calculating formula that Tair=Tw=T, an every n cycle does not force air cutoff valve to shift to an earlier date shut-in time Tair_off is: Tair_off=│ 1-k │ × T × n;
Wherein:
Tw: burner working time, equals the scan period under full load situation;
K: coefficient of excess air;
T: burning scan period;
N: force the combustion period number of closing in advance.
2. the method for flexible control impuls burner coefficient of excess air according to claim 1, it is characterized in that: under high temperature mode full load condition, described coefficient of excess air k is applicable to 0.9 to 1.1.
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| CN103836642B (en) * | 2014-03-14 | 2016-01-20 | 江南大学 | A kind of gas furnace many burners pulse burning control technique method |
| DE102017126137A1 (en) * | 2017-11-08 | 2019-05-09 | Ebm-Papst Landshut Gmbh | Method for controlling a fuel gas operated heater |
| CN111534682B (en) * | 2020-04-30 | 2022-01-18 | 首钢京唐钢铁联合有限责任公司 | Pulse type heating furnace air-fuel ratio control method and device based on flow control |
| CN113847821B (en) * | 2020-06-28 | 2023-10-17 | 宝山钢铁股份有限公司 | Pulse control method for heating furnace burner and furnace temperature control method for pulse furnace |
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