CN103836642A - Method for controlling pulse combustion of multiple burners of fuel gas furnace - Google Patents
Method for controlling pulse combustion of multiple burners of fuel gas furnace Download PDFInfo
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- CN103836642A CN103836642A CN201410094938.4A CN201410094938A CN103836642A CN 103836642 A CN103836642 A CN 103836642A CN 201410094938 A CN201410094938 A CN 201410094938A CN 103836642 A CN103836642 A CN 103836642A
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Abstract
The invention provides a method for controlling pulse combustion of multiple burners of a fuel gas furnace. According to the method, the differential value between a set temperature and the actual temperature inside the fuel gas furnace is calculated through a controller, a temperature difference signal is calculated through a PID, is converted into a multi-time-sequence variable pulse signal by combining the maximum work period of working of the burners, and is output as a control signal, the multi-time-sequence variable pulse signal controls the opening and closing states of an air valve and a fuel gas valve according to different heating modes and controls the work period of the burner controller. The method enables the burners to burn according to a certain rule, thereby effectively controlling the combustion temperature, guaranteeing temperature uniformity inside the fuel gas furnace and improving combustion efficiency.
Description
Technical field
The present invention relates to a kind of burner combustion method, particularly a kind of many burners of heat treatment gas furnace pulse-combustion method.
Background technology
Along with being widely used of natural gas of industry fuel, gas furnace kind and quantity constantly increase, and traditional burner combustion control method has been difficult to adapt to higher heat treatment temperature technological requirement.
Aspect gas furnace burning control, mainly adopt two kinds of modes of flame continuous control and large and small fire control at present.Large and small fire burning is controlled and is divided into again simple break-make pulse-combustion and fixed pulse width burning, and the former lacks the orderly regular distribution of heat energy, can only meet a part of gas furnace temperature requirements, and the latter has certain deficiency aspect harmonious combustion.
Realize the requirement of higher thermal treatment process, adopt above-mentioned method for controlling combustion, in a lot of combustion gas low temperature oven, cannot reach temperature homogeneity requirement.
Summary of the invention
The object of the invention is for gas furnace provides a kind of new burner pulse-combustion method, the digitlization allocation rule of the method based on heat energy, that can realize gas furnace adds thermal control and cooling control.
Technical scheme of the present invention is as follows:
A kind of many burners of gas furnace pulse-combustion control method, comprises the following steps:
A. set temperature sensor, by the actual temperature in described temperature sensor measurement gas furnace;
B., controller is set, gathers the actual temperature in the gas furnace that described temperature sensor measurement obtains, and input design temperature and set the maximal duty cycle of burner work, minimum work period; Calculate the temperature signal of the interior actual temperature of gas furnace and described design temperature, and described temperature signal is calculated by PID and be converted to the output of multiple timings variable pulse signal in conjunction with the maximal duty cycle of burner work;
C., gas valve, air valve are set respectively; In the time that controller is set as PULSE HEATING control mode, described multiple timings variable pulse signal controlling air valve and gas valve open and close simultaneously; In the time that controller is set as pulse cooling control mode, gas valve is normally closed, the switching of described multiple timings variable pulse signal controlling air valve;
D., burner controller is set, and when described multiple timings variable pulse signal is high level, burner controller is put little fighting and is carried out flame detection under the control of described controller, maintains burner combustion.
Its further technical scheme is: in described step b, the method that temperature signal is converted to the output of multiple timings variable pulse signal is as follows:
By PID computing formula (1), temperature signal is converted to power percentage signal:
In formula (1), u (t) is the power percentage signal of output, and e (t) is the difference of design temperature and actual temperature, K
p, K
i, K
dbe respectively proportionality constant, integral constant, derivative constant;
Through type (2) is converted to power percentage signal u (t) the pulse width T on of the multiple timings variable pulse signal of controlling burner work:
Ton=u(t)Tonmax（2）
In formula (2), Tonmax is the maximal duty cycle of burner work, and the value of u (t) is 0～100%, in the time that u (t) is less than 5%, and combustion furnace job insecurity, pulse signal is closed, and burner does not burn;
The span of pulse width T on is Ton=(0, K
1p), the working time of multiple timings pulse is spaced apart: Tr=K
2pe
1-p, wherein P is power output, K
1, K
2for constant, K
1span be 60～100, K
2span be 5～15.
Its further technical scheme is: the working time interval of adjacent two burners is greater than zero.
Its further technical scheme is: in the time that the sequential of described pulse is changed, described controller is converted to inverse time order by multiple burner combustion sequence timings by up time order, or is converted to up time order by inverse time order.
Useful technique effect of the present invention is:
In the present invention, the width Ton of pulse signal changes with temperature signal, and the adjacent pulse time interval, Tr also changed, and this makes the burner big fire time is not changeless, thus stove in burning in time with space on more balanced, relatively save the energy.In burning, furnace atmosphere is uniformly mixed more abundant, and heat exchange degree is ardent, and in stove, temperature homogeneity is good.And this pulse control method is applicable to the burning control of high low temperature oven.
Many burner combustions stove adopts after this method, has also avoided the same time to have the working time of 2 and above burner to overlap completely, can avoid the big ups and downs of air fuel gas pressure.In addition, the work schedule of many burners can timing automaticly automatically change in the burning of up time order and two kinds of situations of inverse time order burning, the exchange that has improved the thermal efficiency and heat.
Accompanying drawing explanation
Fig. 1 is composition of the control system block diagram of the present invention.
Fig. 2 is the embodiment schematic diagram that a kind of burner is arranged.
Fig. 3-a is the time sequential pulse distribution diagram of power output while being 100% full power.
Fig. 3-b be power output be full power 75% time time sequential pulse distribution diagram.
Fig. 3-c be power output be full power 50% time time sequential pulse distribution diagram.
Fig. 3-d be power output be full power 10% time time sequential pulse distribution diagram.
The specific embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
The present invention is directed to the control of multiple burners in gas furnace and proposed a kind of new control method, do not relate to the burning control situation of basic single burner.Each burner energy normal combustion, needs air valve and gas valve that air and combustion gas are provided respectively, and guarantees certain reasonably air-fuel ratio, also needs burner controller that the function such as igniting and fire inspection is provided.
Before burner work, set maximal duty cycle time T onmax and the minimum work period time T onmin of burner combustion.
As shown in Figure 1, controller receives after the actual temperature of temperature sensor measurement, with design temperature contrast, obtains temperature signal, carries out PID calculating, exports a power percentage signal.Its control law is:
Wherein: u (t) is the power percentage signal of output, and e (t) is the difference of design temperature and actual temperature, K
p, K
i, K
dbe respectively proportionality constant, integral constant, derivative constant, K
p, K
i, K
dthree constants can gather examination method by experiment and determine.First by K
pbe adjusted to a smaller value, increase gradually K
p, observed responses curve, until obtain reacting fast, the little line of response of overshoot.Then by K
pbe reduced to originally 50%～80%, then will be adjusted to a higher value time of integration, reduce gradually the time of integration, and corresponding adjustment K
i, examination is gathered to the response that obtains being satisfied with repeatedly.Finally will be adjusted to derivative time is zero, increases derivative time gradually, correspondingly changes Kd and the time of integration simultaneously, and examination is gathered repeatedly, final control effect and the pid control parameter that obtains satisfaction.Said method is existing known technology, specifically can be referring to the textbook in PID automatic control field or instrument handbook.
The big or small u (t) of this power percentage signal can be converted to the multiple timings variable pulse signal Ton that controls burner work:
Ton=u(t)Tonmax（2）
The value of u (t) is 0～100%, in the time that u (t) is less than 5%, and combustion furnace job insecurity, pulse signal will be closed, and burner stops burning.
From (1) and (2) two formulas, different work pulsewidth Ton corresponding to temperature signal e (t), has realized the control of pulse-width.
The span of pulse width is Ton=(0, K
1p), the working time of pulse is spaced apart: Tr=K
2pe
1-p, wherein, P is power output, K
1, K
2for constant, K
1span be 60～100, K
2span be 5～15.
Fig. 2 is the distribution mode of multiple burners in a gas furnace, and in figure, four converter noses are numbered respectively B1, B2, B3 and B4.
Fig. 3-a, Fig. 3-b, Fig. 3-c and Fig. 3-d have shown several specific timing charts.Fig. 3-a is the time sequential pulse distribution diagram of power output while being 100% full power, now burner total power burning.Fig. 3-b be power output be full power 75% time time sequential pulse distribution diagram.Fig. 3-c be power output be full power 50% time time sequential pulse distribution diagram, now each burner work pulsewidth is peaked half, the work of staggering the time of adjacent two burners forms a burning whirlpool, is beneficial to the transmission of heat.Fig. 3-d be power output be full power 10% time time sequential pulse distribution diagram, now each burner work very short time, but can guarantee the reliable and stable work of each burner, this time is also the minimum cycle time that burner can reliably working.If when power output is less than 5%, combustion furnace job insecurity, pulse will be closed.As we know from the figure, distribution of pulses is evenly and has sequential, this method can overcome the concentrated combustion problem that flocks together that traditional control method brings.
In order to improve the exchange of the thermal efficiency and heat, in the present invention, the work schedule of multiple burners can regularly change, when the conversion of multiple timings variable pulse signal sequence, described controller is converted to inverse time order by multiple burner combustion sequence timings by up time order, or is converted to up time order by inverse time order.The combustion order of four burners as shown in Fig. 3-a is up time order: B1-B2-B3-B4, can timing automaticly change into inverse time order: B4-B3-B2-B1.
When gas furnace is realized heating process, controller control air valve and gas valve open and close simultaneously, the work period of pulse signal control air valve and gas valve.When gas furnace is realized process for cooling, gas valve is closed always, the work period of a pulse signal control air valve.
In the present invention, because the work pulsewidth of burner combustion changes, i.e. the burner big fire time is not changeless, thus stove in burning in time with space on more balanced, relatively save the energy, improved efficiency of combustion.In burning, furnace atmosphere is uniformly mixed more abundant, and heat exchange degree is ardent, and in stove, temperature homogeneity is good.And this pulse control method is applicable to the burning control of high low temperature oven.
Above-described is only the preferred embodiment of the present invention, the invention is not restricted to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate without departing from the spirit and concept in the present invention, within all should thinking and being included in protection scope of the present invention.
Claims (4)
1. many burners of gas furnace pulse-combustion control method, comprises the following steps:
A. set temperature sensor, by the actual temperature in described temperature sensor measurement gas furnace;
B., controller is set, gathers the actual temperature in the gas furnace that described temperature sensor measurement obtains, and input design temperature and set the maximal duty cycle of burner work, minimum work period; Calculate the temperature signal of the interior actual temperature of gas furnace and described design temperature, and described temperature signal is calculated by PID and be converted to the output of multiple timings variable pulse signal in conjunction with the maximal duty cycle of burner work;
C., gas valve, air valve are set respectively; In the time that controller is set as PULSE HEATING control mode, described multiple timings variable pulse signal controlling air valve and gas valve open and close simultaneously; In the time that controller is set as pulse cooling control mode, gas valve is normally closed, the switching of described multiple timings variable pulse signal controlling air valve;
D., burner controller is set, and when described multiple timings variable pulse signal is high level, burner controller is put little fighting and is carried out flame detection under the control of described controller, maintains burner combustion.
2. burner pulse-combustion method according to claim 1, is characterized in that: in described step b, the method that temperature signal is converted to the output of multiple timings variable pulse signal is as follows:
By PID computing formula (1), temperature signal is converted to power percentage signal:
In formula (1), u (t) is the power percentage signal of output, and e (t) is the difference of design temperature and actual temperature, K
p, K
i, K
dbe respectively proportionality constant, integral constant, derivative constant;
Through type (2) is converted to power percentage signal u (t) the pulse width T on of the multiple timings variable pulse signal of controlling burner work:
Ton=u(t)Tonmax（2）
In formula (2), Tonmax is the maximal duty cycle of burner work, and the value of u (t) is 0～100%, in the time that u (t) is less than 5%, and combustion furnace job insecurity, pulse signal is closed, and burner does not burn;
The span of pulse width T on is Ton=(0, K
1p), the working time of multiple timings pulse is spaced apart: Tr=K
2pe
1-p, wherein P is power output, K
1, K
2for constant, K
1span be 60～100, K
2span be 5～15.
3. burner pulse-combustion method according to claim 1, is characterized in that: the working time interval of adjacent two burners is greater than zero.
4. burner pulse-combustion method according to claim 1, is characterized in that: in the time that the sequential of described pulse is changed, described controller is converted to inverse time order by multiple burner combustion sequence timings by up time order, or is converted to up time order by inverse time order.
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Cited By (8)
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| CN105864819A (en) * | 2016-05-20 | 2016-08-17 | 大连大学 | Multi-fragment pulse combustion control system and method |
| CN106052410A (en) * | 2016-07-21 | 2016-10-26 | 江苏丰东热技术股份有限公司 | Pulse control method for multiple burning nozzles of heating furnace |
| WO2017008189A1 (en) * | 2015-07-10 | 2017-01-19 | 吴鹏 | Boiler temperature control method and system |
| CN106362648A (en) * | 2016-09-27 | 2017-02-01 | 北京神雾环境能源科技集团股份有限公司 | Heat accumulating type quick pyrolysis furnace temperature control method capable of controlling air-fuel ratio |
| CN108277337A (en) * | 2018-02-27 | 2018-07-13 | 首钢京唐钢铁联合有限责任公司 | A kind of vertical continuous annealing furnace control method |
| CN109189118B (en) * | 2018-08-27 | 2021-04-23 | 江苏丰东热技术有限公司 | Burner combustion control method and device |
| US11421874B2 (en) | 2019-03-19 | 2022-08-23 | Midea Group Co., Ltd. | Digital gas valve burner control systems and methods |
| US11754291B2 (en) | 2020-09-28 | 2023-09-12 | Midea Group Co., Ltd. | Modulating oven burner control for gas cooking appliance |
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| CN101344264B (en) * | 2008-08-22 | 2010-06-02 | 武汉理工大学 | Mixed combustion control system of oxygen-enriched and full-oxygen combustion ceramic roller kiln |
| JP2010092389A (en) * | 2008-10-10 | 2010-04-22 | Hitachi Kokusai Electric Inc | Temperature control method of heat treatment apparatus |
| CN101737797B (en) * | 2010-01-12 | 2013-04-17 | 中冶东方工程技术有限公司 | Pulse combustion control method |
| CN102221220A (en) * | 2011-03-29 | 2011-10-19 | 上海宝钢工业检测公司 | Pulse-combustion control method of steel rolling heating furnace |
| CN202032608U (en) * | 2011-04-01 | 2011-11-09 | 上海宝钢工业检测公司 | Wide temperature field automatic regulator for pulse combustion furnace |
| CN103256623B (en) * | 2012-02-20 | 2015-06-17 | 宝山钢铁股份有限公司 | Method for flexibly controlling air excess coefficient of impulse burner |
| CN102736646A (en) * | 2012-06-28 | 2012-10-17 | 江苏金源锻造股份有限公司 | Temperature control system of natural gas heating furnace |
| CN103557534B (en) * | 2013-11-11 | 2016-04-20 | 中冶南方工程技术有限公司 | High-precision pulse combustion control method of industrial furnace |
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2014
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| WO2017008189A1 (en) * | 2015-07-10 | 2017-01-19 | 吴鹏 | Boiler temperature control method and system |
| CN105864819A (en) * | 2016-05-20 | 2016-08-17 | 大连大学 | Multi-fragment pulse combustion control system and method |
| CN106052410A (en) * | 2016-07-21 | 2016-10-26 | 江苏丰东热技术股份有限公司 | Pulse control method for multiple burning nozzles of heating furnace |
| CN106362648A (en) * | 2016-09-27 | 2017-02-01 | 北京神雾环境能源科技集团股份有限公司 | Heat accumulating type quick pyrolysis furnace temperature control method capable of controlling air-fuel ratio |
| CN108277337A (en) * | 2018-02-27 | 2018-07-13 | 首钢京唐钢铁联合有限责任公司 | A kind of vertical continuous annealing furnace control method |
| CN109189118B (en) * | 2018-08-27 | 2021-04-23 | 江苏丰东热技术有限公司 | Burner combustion control method and device |
| US11421874B2 (en) | 2019-03-19 | 2022-08-23 | Midea Group Co., Ltd. | Digital gas valve burner control systems and methods |
| US11754291B2 (en) | 2020-09-28 | 2023-09-12 | Midea Group Co., Ltd. | Modulating oven burner control for gas cooking appliance |
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