CN100447491C - Inverting time control method for heat accumulation type burner - Google Patents
Inverting time control method for heat accumulation type burner Download PDFInfo
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- CN100447491C CN100447491C CNB2007100781788A CN200710078178A CN100447491C CN 100447491 C CN100447491 C CN 100447491C CN B2007100781788 A CNB2007100781788 A CN B2007100781788A CN 200710078178 A CN200710078178 A CN 200710078178A CN 100447491 C CN100447491 C CN 100447491C
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000009825 accumulation Methods 0.000 title claims description 10
- 230000000630 rising effect Effects 0.000 claims description 16
- 230000007423 decrease Effects 0.000 claims description 10
- 238000004904 shortening Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 239000000446 fuel Substances 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract 1
- 238000005338 heat storage Methods 0.000 description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 15
- 239000003546 flue gas Substances 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000000567 combustion gas Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000003517 fume Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000001172 regenerating effect Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- 206010019332 Heat exhaustion Diseases 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Regulation And Control Of Combustion (AREA)
Abstract
The invention discloses a method for controlling the steering time in thermal-accumulated burner. The invention is characterized in that when the thermal-accumulated burner is ignited, the burning time of two nozzles are reduced stepped along the temperature increase of furnace. Compared with present technique, the invention can reduce the steering time along the optimized curvature according to the temperature increase of the furnace, to control the air and fuel temperatures, reduce the flame temperature, and improve the temperature-control accuracy. With the increase of furnace temperature, the steering time is reduced stepped, to improve the control accuracy from +-5 Deg. C to +-1 Deg. C to reach the control level of electric furnace. And at the high temperature, the invention can reduce the flame temperature to confirm the control accuracy. At the low temperature, the invention can improve the temperature of accumulator to improve the preheat temperatures of air and gas, to improve the heating efficiency. The invention can reduce the energy consumption.
Description
Technical field
The present invention relates to a kind of control method of heat accumulating burner capable, especially control two burners of heat accumulating burner capable and take turns the inverting time control method of burning time.
Background technology
Heat accumulating burner capable is heat accumulating type impulse burner A, the B that adopts paired quantity combusted to be directly proportional with exhaust smoke level, and the high-temperature flue gas that burning is produced carries out waste heat recovery.When a side burner A burnt, opposite side burner B carried out air-breathing smoke evacuation to the high-temperature flue gas in the burner hearth, high-temperature flue gas during by this burner heat storage and heat storage carry out thermal energy exchange, heat storage heat absorption, high-temperature flue-gas reduce, and are discharged from last.Through certain hour, the burning commutation, burner B burning, cold air or combustion gas enter burner through the very high heat storage of excess temperature, are heated into high temperature air or combustion gas by this heat storage, with combustion gas or air mixed combustion; Simultaneously, the A burner carries out air-breathing smoke evacuation, and high-temperature flue gas with heat storage heating in the A burner, carries out heat exchange again.By the continuous alternate combustion repeatedly of paired burner A, B, high-temperature flue gas is carried out limit waste heat recovery, reach energy-conservation effect.In the prior art, in order to improve efficiency of energy utilization, reduce energy-output ratio, adopted above-mentioned heat accumulating burner capable, name as the applicant's application is called " digitlization high-temperature low-oxygen air pulse burner ", and number of patent application is 200620110072.2 Chinese utility model patent; This kind burner, cooperate by reversing arrangement, heat accumulating type impulse burner, pulse regulation device, pulse control unit and other devices, burning in turn by two burners, the heat that can fully absorb in the high-temperature flue gas also heats combustion air/combustion gas with this heat, has improved efficiency of energy utilization; Guaranteed that combustion gas can in time be ignited, effectively avoided combustion gas to assemble caused potential safety hazard because of can not in time lighting.
But, the existing conventional heat accumulating burner capable, be fixed value its commutating period, and along with the rising of furnace temperature, regenerator temperature is more and more higher, and the air and the fuel gas temperature that are heated by heat storage are more and more higher, only are lower than 100～150 ℃ of furnace temperature.For exotic fuels, flame temperature can be easy to cause hot-spot, heated object burning up to 2500 ℃, even accident such as fusing.Influenced greatly regenerative combustion technology at batch kiln, need the application on the heat-treatment furnace of precise temperature control.Along with the rising of furnace temperature, more and more higher especially at holding stage to the requirement of stove temperature-controlled precision, as require at ± 1 ℃, then existing temperature control equipment can not reach.For the batch (-type) industrial furnace, must experience the process from low temperature to high temperature; In low-temperature zone, the user wishes to be rapidly heated, to improve the efficiency of heating surface by improving flame temperature, just needs the burning time of corresponding prolongation burner.In high temperature section, the user wishes to reduce flame temperature and prevents overheated and burning, just needs the burning time of corresponding shortening burner.Adopt commutation pattern and the control device of set time, obviously can not satisfy actual needs.
In addition, for most of fuel the low-heat value gas of two preheatings (adopt except), the heat content in the high-temperature flue gas discharge capacity after the burning is all greater than by being brought into the heat content in the industrial furnace after the heat storage heat exchange.That is to say that the heat that heat storage can be recycled needs heat in the discharged flue gas less than industrial furnace, therefore caused the imbalance that reclaims with discharging.For example during gas-firing, the heat in nearly 15～20% the flue gas can't reclaim, in addition discharging.
For adopting the fixedly conventional regenerative oven of commutating period, this imbalance can cause following consequence:
If when 1 flue gas is all discharged by heat storage, can cause regenerator temperature constantly to raise, exhaust gas temperature constantly raises, and finally causes exhaust gas temperature too high, and fume extraction apparatus is difficult to bear.
2, additional fume extractor is not set, the control exhaust gas temperature is not discharged partial fume from heat storage, therefore cause furnace pressure too high, and unnecessary flue gas is discharged by place, slits such as fire door nature, causes device damage such as fire door easily.
3, increase additional tapping equipment, as flue and chimney etc., complicated industrial furnace structure has increased construction cost, has increased the control difficulty.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, the inverting time control method for heat accumulation type burner that changes automatically along with the variation of furnace temperature a kind of commutating period is provided.This method has at high temperature reduced flame temperature, has improved the control accuracy of furnace temperature.
The heat that the low-temperature flue gas that the heat exhaustion of heat-accumulating industrial furnace fuel is roughly the heat absorption that is heated workpiece, body of heater heat radiation, heat storage tank (container of dress heat storage) heat radiation, extract out from heat storage is taken away and for keeping pressure-fired causes in the industrial furnace furnace gas effusion etc.
Technical scheme of the present invention: inverting time control method for heat accumulation type burner is characterized in that: after the heat accumulating burner capable ignition, shorten gradually along with the rising of furnace the commutating period that two burner burns in turn; Because be the burnings in turn of two burners, for guaranteeing the balance of burning, the variation of commutating period should guarantee the combustion period of two burners, is the even-multiple in two burner combustion cycles.
A kind of device of realizing the above-mentioned inverting time control method of claim is characterized in that: be made up of temperature sensor, chromacoder, processor, commutation executive component, be electrically connected successively; Temperature sensor is arranged on the heat accumulating burner capable body of heater, gathers the temperature signal in the stove; Chromacoder is changed the signal of temperature sensor input, converts the signal that processor can be discerned to, in the temperature signal input processor, handles; Processor sends control signal according to result to the commutation executive component, controls it and produces the commutation action, thereby make burner burn in turn.
Further be characterised in that: shorten gradually along with the rising of furnace commutating period, linearly type decline relation; Reach a certain set temperature value, its change commutating period is little, keeps constant substantially.
Inverting time control method for heat accumulation type burner of the present invention with respect to prior art, has following characteristics:
1, along with the rising of furnace temperature, progressively shorten according to the curve optimized according to furnace temperature commutating period, controlled air and fuel gas temperature by heat storage effectively, reduced flame temperature effectively, controlled hot-spot, the generation of accidents such as burning.
2, effectively improve temperature-controlled precision; Rising along with furnace temperature, progressively shorten commutating period, with the temperature-controlled precision of the fixing conventional regenerative oven of commutating period from ± 5 ℃ bring up to ± 1 ℃, reached the control level of electric furnace, for regenerative combustion technology is needing the application on the heat-treatment furnace of precise temperature control to lay a good foundation.
3, can reduce flame temperature in high temperature section, prevent overheated and burning, guarantee temperature-controlled precision; In low-temperature zone, by prolonging the burning time of burner, improve regenerator temperature, flame temperature, improved the preheat temperature of low-temperature zone heated air and coal gas, improved low-temperature zone burned flame temperature, improve the low-temperature zone efficiency of heating surface.
4, reduce energy-output ratio, energy-conserving and environment-protective.
5, adopt technology of the present invention, can cancel conventional regenerative oven and must increase additional fume extractor (as flue and chimney), the discharging of flue gas is discharged from heat-accumulating burner fully.Adopt method of the present invention, more and more low along with the reduction of heat-exchange time by the high-temperature flue-gas behind the heat storage, guaranteed the operate as normal of equipment such as smoking blower fan.Simultaneously, heat storage becomes the buffer medium of fire box temperature, makes workpiece heat absorption, the heat radiation of industrial furnace body of heater and heat storage tank etc. inhale heat release with heat storage and forms balance.By facts have proved, use method of the present invention, heat storage as buffer medium, not only can be cancelled other fume extractor, and can accurately control furnace pressure, make the control level of Fuel Furnace and the level that operant level has all reached electric furnace.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing;
Fig. 1 is commutating period of the present invention and furnace temperature graph of a relation (first kind of embodiment);
Fig. 2 is commutating period of the present invention and furnace temperature graph of a relation (second kind of embodiment);
Fig. 3 is commutating period of the present invention and furnace temperature graph of a relation (the third embodiment);
Fig. 4 is commutating period of the present invention and furnace temperature graph of a relation (the 4th kind of embodiment);
Fig. 5 is commutating period of the present invention and furnace temperature graph of a relation (the 5th kind of embodiment);
Fig. 6 is a kind of temperature control device structure schematic diagram of the present invention.
The specific embodiment
In Fig. 1, commutating period of the present invention and furnace temperature concern schematic diagram, and two burners of heat accumulating burner capable are the commutating period of burning in turn, after the heat accumulating burner capable ignition, shorten gradually along with the rising of furnace the commutating period that two burner burns in turn; Reach a certain set temperature value, its change commutating period is very little, keeps constant substantially.Because be the burnings in turn of two burners, for guaranteeing the balance of burning, the variation of commutating period should guarantee the combustion period of two burners, is the even-multiple in two burner combustion cycles.
In Fig. 1, commutating period of the present invention and furnace temperature concern first kind of embodiment schematic diagram, and commutating period and furnace are linear decline relation, and shorten gradually along with the rising of furnace commutating period, linearly type decline relation; When reaching a certain set temperature value, its change commutating period is very little, keeps constant substantially.Certainly, for different stoves, and the difference of the type, size, material etc. of product to be heated in the stove, in order to reach the optimised process effect, the K value of linear commutating period and furnace relation is differentiated (the K value is meant linear descending slope); Its desired temperature that reaches also has difference, and when reaching this desired temperature, linear descending slope K value levels off to zero, and commutating period, change was very little, kept constant substantially.
For example, after the stove ignition, two burners were assumed to for 60 seconds in second to 120 in turn the commutating period of burning, specifically were assumed to be for 90 seconds, along with the rising of furnace, shorten its commutating period gradually, may be respectively 86 seconds, 82 seconds, 79 seconds ... Deng; When furnace reaches a certain set temperature value, as be assumed to 800 ℃ to 1100 ℃, specifically can be assumed to be 900 ℃, two burners may be reduced within 20 seconds in second to 30 in turn the commutating period of burning, suppose and be reduced to for 25 seconds, then keep constant commutating period afterwards substantially, change very little.In fact, the temperature in this stage reaches the holding temperature of technological requirement usually, is among the insulating process.
In Fig. 2, commutating period of the present invention and furnace temperature concern second kind of embodiment schematic diagram; After the stove ignition, shorten gradually along with the rising of furnace its commutating period; When reaching a certain set temperature value, its change commutating period is very little, keeps constant substantially.The variation relation of commutating period and furnace temperature is made up of the line segment of the descending slope difference more than two (the K value is different); The initial stage of stove ignition, furnace temperature is lower, and commutating period is longer, and its descending slope is very big, and commutating period and furnace temperature be type decline relation linearly; When temperature reaches each concrete setting value respectively, when the T1 among the figure, T2, T3, T4 equitemperature value, furnace temperature raises gradually, reduce commutating period synchronously, commutating period and furnace temperature still linearly descend and concern that its descending slope diminishes gradually, and the descending slope that its linear pattern descends diminishes.When reaching the set temperature value of holding stage, its change commutating period is very little, keeps constant substantially.
In Fig. 3, commutating period of the present invention and furnace temperature concern the third embodiment schematic diagram; After the stove ignition, shorten gradually along with the rising of furnace its commutating period; When reaching a certain set temperature value, its change commutating period is very little, keeps constant substantially.The variation relation of commutating period and furnace temperature is not above-mentioned two kinds of straight lines decline relation, and the relation but curve descends can be that conic section decline concerns.Certainly, for different stoves, and the difference of the type, size, material etc. of product to be heated in the stove, its commutating period can difference with curvilinear equation, the especially quadratic curve equation of the decline relation that furnace temperature changes.The parameter of curvilinear equation and quadratic curve equation has a variety of.
In Fig. 4, commutating period of the present invention and furnace temperature concern the 4th kind of embodiment schematic diagram; After the stove ignition, shorten gradually along with the rising of furnace its commutating period; At first in a design temperature scope, temperature is during less than T1, and commutating period is constant, keeps a fixing setting value t1; When temperature during, shorten to setting value t2 commutating period, and keep finish the commutating period of t2 to insulation greater than T1.
In Fig. 5, commutating period of the present invention and furnace temperature concern the 5th kind of embodiment schematic diagram; After the stove ignition, gradually shorten commutating period stepped shortening along with the rising of furnace its commutating period; When furnace was lower than design temperature T2, commutating period was constant in setting value t1; When furnace was between design temperature T2 and T3, commutating period was constant in setting value t2; When furnace was between design temperature T3 and T4, commutating period was constant in setting value t3; When furnace during greater than design temperature T4, commutating period is constant to be setting value t4.
Commutating period of the present invention and furnace temperature relation can also have multiple specific embodiment; Those skilled in the art according to technology enlightenment of the present invention, can associate the embodiment that is equal to, and the above-mentioned embodiment that is equal to will fall into protection scope of the present invention equally.
In Fig. 6,1-temperature sensor, 2-chromacoder, 3-processor, the 4-executive component that commutates;
A kind of temperature control device structure of the present invention comprises temperature sensor 1, chromacoder 2, processor 3, commutation executive component 4, is electrically connected successively; Temperature sensor 1 is arranged on the proper site of heat accumulating burner capable body of heater, gathers the temperature signal in the stove; In the temperature signal input signal conversion equipment 2 that collects by temperature sensor 1, carry out the signal conversion through chromacoder 2, convert the signal that processor 3 can be discerned to, temperature signal input processor 3 grades are had in the equipment of processing capacity, handle, calculating etc.Processor 3 is PLC programmable controllers of the prior art, can carry out computing to the temperature signal of importing in it according to prefabricated program,, send control signal to commutation executive component 4 according to result, control it and produce the commutation action, make the burning in turn of two burners.
Claims (6)
1, inverting time control method for heat accumulation type burner is characterized in that: after the heat accumulating burner capable ignition, progressively shorten along with the rising of furnace the commutating period that two burner burns in turn; When reaching a certain set temperature value, its change commutating period is little, keeps constant substantially.
2, a kind of device of realizing the described inverting time control method of claim 1 is characterized in that: be made up of temperature sensor (1), chromacoder (2), processor (3), commutation executive component (4), be electrically connected successively; Temperature sensor (1) is arranged on the heat accumulating burner capable body of heater, gathers the temperature signal in the stove; Chromacoder (2) is changed the signal of temperature sensor (1) input, converts the signal that processor (3) can be discerned to, in temperature signal input processor (3), handles; Processor (3) sends control signal according to result to commutation executive component (4), controls it and produces the commutation action, makes the burning in turn of two burners.
3, inverting time control method for heat accumulation type burner according to claim 1 is characterized in that: shorten gradually along with the rising of furnace commutating period, linearly type decline relation; When reaching a certain set temperature value, its change commutating period is little, keeps constant substantially.
4, inverting time control method for heat accumulation type burner according to claim 1 is characterized in that: the variation relation of commutating period and furnace temperature, form by the line segment that the descending slope more than two is different; The initial stage of stove ignition, furnace temperature is lower, and commutating period is longer, and the line segment descending slope is very big, and commutating period and furnace temperature be type decline relation linearly; When furnace temperature raises gradually, shorten commutating period synchronously, commutating period and the furnace temperature relation that linearly descends, and its descending slope diminishes gradually; When reaching a certain set temperature value, its change commutating period is little, keeps constant substantially.
5, inverting time control method for heat accumulation type burner according to claim 1 is characterized in that: the variation relation of commutating period and furnace temperature is a conic section decline relation; When reaching a certain set temperature value, its change commutating period is little, keeps constant substantially.
6, inverting time control method for heat accumulation type burner according to claim 1 is characterized in that: stepped shortening commutating period; When furnace was lower than a certain set temperature value T2, commutating period is constant to be setting value t1; When furnace was between set temperature value T2 and T3, commutating period was constant in setting value t2; When furnace was between set temperature value T3 and T4, commutating period was constant in setting value t3; When furnace during greater than set temperature value T4, commutating period is constant to be setting value t4.
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| CNB2007100781788A CN100447491C (en) | 2007-02-06 | 2007-02-06 | Inverting time control method for heat accumulation type burner |
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| CNB2007100781788A CN100447491C (en) | 2007-02-06 | 2007-02-06 | Inverting time control method for heat accumulation type burner |
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| CN100447491C true CN100447491C (en) | 2008-12-31 |
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Cited By (1)
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| CN101943420A (en) * | 2010-08-11 | 2011-01-12 | 中冶华天工程技术有限公司 | Intermittent delay control process of reversing combustion system |
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Owner name: CHONGQING WORKS TECHNOLOGY DEVELOPMENT CO., LTD. Free format text: FORMER OWNER: GU XIANGTAO Effective date: 20121226 |
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Effective date of registration: 20121226 Address after: High Kam No. 18 building, 400039 Chongqing Jiulongpo Yuzhou Road No. 20-2 Patentee after: Chongqing Aokeqi Technology Co., Ltd. Address before: High Kam No. 18 building, 400039 Chongqing Jiulongpo District Shiqiaopu Yuzhou Road No. 20-2 Patentee before: Gu Xiangtao |