CN101775483B - Heat accumulative roller bottom heating furnace - Google Patents
Heat accumulative roller bottom heating furnace Download PDFInfo
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- CN101775483B CN101775483B CN2010101107756A CN201010110775A CN101775483B CN 101775483 B CN101775483 B CN 101775483B CN 2010101107756 A CN2010101107756 A CN 2010101107756A CN 201010110775 A CN201010110775 A CN 201010110775A CN 101775483 B CN101775483 B CN 101775483B
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Abstract
The invention relates to a heat accumulative roller bottom heating furnace, which belongs to the technical field of steel rolling equipment. Through the application of the heat accumulative combustion technology, the heating quality of steel blanks is improved, and the coal gas consumption is reduced. The invention has the technical scheme that the heat accumulative roller bottom heating furnace comprises a furnace body, a furnace hearth and heat accumulative burner nozzles, wherein the heat accumulative roller bottom heating furnace comprises a plurality of heat accumulative burner nozzles which are uniformly distributed on the upper layers of both sides of the furnace in the furnace length direction, coal gas spray openings and air spray openings are arranged in the heat accumulative burner nozzles, the coal gas spray openings are distributed in the center of the heat accumulative burner nozzles, the air spray openings are uniformly distributed in the peripheral direction of the coal gas spray openings, each heat accumulative burner nozzle is respectively connected with an air pipeline, a coal gas pipeline and a flue gas pipeline. The invention has the advantages that the heat accumulative burner nozzles adopt the concentric jet flow method, and the air and the coal gas after the heat accumulation meet in the furnace at a fixed angle after being sprayed out, so the flame length can be ensured. Heat accumulation cambers are horizontally and fully embedded in the furnace wall, so the heat supply capability of each heat accumulation chamber is enlarged. Compared with a conventional heat accumulative heating furnace, the heating furnace using the technology of the invention saves one fifth of coal gas consumption on the premise of the same yield.
Description
Technical field
The present invention relates to a kind of heat accumulating type roller hearth furnace that is used on the sheet billet continuous casting and rolling production line, belong to the steel rolling equipment technical field.
Background technology
In the CSP production technique, roller hearth furnace plays important effect, it is in the thin slab that the heating continuous caster is produced, also store the high temperature slab, board briquette is heated to 1150 ± 10 ℃ from 800～1050 ℃, stove was interior to be rolled at the bottom of the slab that heats was stayed roller, stove just can connect together two kinds of different production technique of continuous casting and milling train production at the bottom of relying on roller like this, the advantage of performance CSP, improve the output of production line, therefore, the length of stove is generally 200～300 meters at the bottom of the roller, wherein have only 60～80 meters furnace superintendent of process furnace inlet to be used for the slab heating, the process furnace of other each section just is used for the insulation of slab, to be rolled, play a buffered effect.The high-temperature flue gas that in process combustion, is produced, temperature is generally directly discharging out of the furnace by flue more than 1150 ℃, though in flue, all arranged the interchanger of air and coal gas, air and gas temperature can be preheating to 400 ℃, but, because the pipeline of air and coal gas is long, actual burner preceding air and the gas temperature of arriving has only about 150 ℃, therefore the thermo-efficiency of roller hearth type heating furnace has only 15～20% usually, and the thermo-efficiency of conventional continuous furnace is generally more than 50%.Therefore thermo-efficiency is low, and the fuel consumption height is a critical defect of the type process furnace.
On the heater for rolling steel of routine, all adopt the type of heating of heat storage type combustion at present usually as raw materials such as steel billets, this combustion system burner I, II uses in pairs, the high-temp waste gas that is produced during the I burner combustion is sucked by the II burner on opposite, heat storage in the heating heat storage tank, at this moment in the heat storage tank of II burner heat exchanging process takes place, the top temperature of heat storage is raised to more than 1000 ℃, after being reduced to 150 ℃, flue-gas temperature discharges from II burner afterbody, and the regenerator temperature in the I burner also progressively reduces thereupon, wind-warm syndrome also progressively reduces, behind one-period, I, the reversing combustion of II burner, repeat combustion processes just now, therefore, no matter pass through from the I burner or from the II burner, combustion-supporting hot air temperature is more than 1000 ℃, and the flue-gas temperature of discharging is all below 150 ℃, than the routine burning of on stove at the bottom of the roller, adopting in the past, heat storage type combustion flue gas funnel temperature is below 150 ℃, rather than 1150 ℃ high-temperature flue gas directly discharged, therefore, the thermo-efficiency that adopts stove at the bottom of the roller of heat storage type combustion than conventional incendiary roller at the bottom of stove exceed a lot.
But as conventional heat storage type combustion, air or gas preheating temperature are all very high, usually can reach 1000 ℃, therefore, all heat-accumulation combustions have all adopted the outer mode of mixing to burn, air after the accumulation of heat or coal gas mix at the burner hearth inner edge, the limit burning, and the length of flame of heat-accumulating burner is generally all at 3～6 meters.And the inner width of stove has only 2 meters at the bottom of the roller, if adopt common regenerative combustion technology then can occur: fuel of discharging from the I burner and air are also failed perfect combustion in process furnace, just sucked by the II burner on opposite, thereby in the II burner secondary combustion takes place, and in a narrow space, secondary combustion takes place owing to air and coal gas are sufficient, its temperature of combustion will reach more than 1400 ℃, thereby various unpredictable consequences appear, overtemperature in the burner gently then can occur, heavy then scorification heat storage, burn out various phenomenons such as furnace wall.In addition, the equipment complexity of heat storage type combustion, bulky, comparatively speaking, common heat-accumulating burner can not installed and used on the stove at the bottom of the simple relatively roller of structure.
Because the regenerative combustion technology of prior art can not directly be applied on the roller hearth type heating furnace, how at the characteristics of roller hearth type heating furnace, again carry out the exploitation of heat accumulating type technology, making the heat accumulating type technology be applied on roller hearth furnace is the new problem that the technician faces.
Summary of the invention
Technical problem to be solved by this invention provides a kind of improved roller hearth furnace that can use regenerative combustion technology, raising steel billet heating quality, reduce gas consumption.
The technical scheme that solves the problems of the technologies described above is:
A kind of heat accumulating type roller hearth furnace, it comprises body of heater, burner hearth and heat-accumulating burner, heat-accumulating burner is a plurality of, in burner hearth along the furnace superintendent direction, arrange evenly that on upper strata, stove both sides gas port and air jet are arranged in the heat-accumulating burner, gas port is arranged in the burner center, air jet arranges evenly that along the gas port peripheral direction each heat-accumulating burner is connected with air line, gas line, flue respectively.
Gas flue in the above-mentioned heat accumulating type roller hearth furnace, heat-accumulating burner is the volute passage, is provided with the turbine guide passage in the air passageways.
Above-mentioned heat accumulating type roller hearth furnace has been installed a taper coal gas shunting short tube that can make coal gas form the hollow tube-shape swirling eddy along its outer wall in the gas flue of heat-accumulating burner.
Above-mentioned heat accumulating type roller hearth furnace, the burner block of heat-accumulating burner around air passageways in be laid with heat storage.
Above-mentioned heat accumulating type roller hearth furnace, the junction of gas line and heat-accumulating burner have coal gas to cut valve soon.
The invention has the advantages that: the air of each heat-accumulating burner, flue gas, coal gas have a system of one's own, and burner adopts concentric mode of jet, after air after the accumulation of heat and the coal gas ejection, meet in stove along a fixed angle, thereby can guarantee the length of flame; The regenerator level all is embedded in the furnace wall, make the heat capacity of each regenerator increase like this, under equal yield line, save 1/5 gas consumption on the more conventional recuperative heater of recuperative heater of application present technique, adopt Regenerative Combustion Technology, air preheating temperature＞1000 ℃ (only than low 50～80 ℃ of furnace temperature), funnel temperature＜150 ℃; Thereby, can reclaim the waste heat in the flue gas significantly.
Description of drawings
Fig. 1 is an one-piece construction synoptic diagram of the present invention;
Fig. 2 is the cross-sectional view of Fig. 1;
Fig. 3 is the external view of heat-accumulating burner;
Fig. 4 is the cross-sectional view that heat-accumulating burner is overlooked direction.
Number in the figure is as follows: body of heater 1, heat-accumulating burner 2, gas line 3, flue 4, furnace roller 5, air line 6, furnace wall 7, coal gas main pipe line 8, coal gas are cut valve 9, gas main duct 10, flue gas manually-operated gate 11, air manually-operated gate 12, air/flue gas reversing valve 13, gas line flange 14, heat storage 15, burner block 16, air jet 17, gas port 18 soon
Embodiment
The present invention includes body of heater, burner hearth and the heat-accumulating burner of stove at the bottom of the heat accumulating type roller.In this process furnace, what the process furnace combustion air adopted is heat accumulating type, and freezing air is accumulation of heat in heat-accumulating burner, and the air themperature of process accumulation of heat can reach more than 1000 ℃.And preheating is not carried out in the not accumulation of heat of coal gas that acts as a fuel yet, and by cutting valve control soon in the system, a complete combustion processes has been formed in the discharge of the entering of the open and close of coal gas and air, flue gas together in heat-accumulating burner.
In the present invention, recuperative heater adopts several heat-accumulating burners, burner adopts flow pulse control, be arranged in the upper strata of stove at the bottom of the roller, evenly arrange along the furnace superintendent direction in the stove both sides, by the disturbance of high temperature gas flow, realize that whole heating-furnace bore temperature is even, finally reach the material even heating.Other has the high-temperature flue gas that produces after the partial combustion to discharge from lower furnace portion, thereby plays the effect of heating slab bottom, and the temperature difference of slab upper and lower surface is controlled in 10 ℃.
Fig. 1 has provided the structure iron of recuperative heater, it comprises body of heater 1, air line 6, flue 4 are housed respectively on it, this air line 6, flue 4 and air/flue gas reversing valve 13 (showing) end UNICOM as Fig. 3, the other end of air/flue gas reversing valve 13 and air line 6, air side flue gas exhaust pipeline 4 UNICOMs, cut valve 9 (showing) UNICOM soon by coal gas in the middle of the gas line 3, pipeline UNICOM separately in the heat-accumulating burner 2 in air outside pipeline 6, flue 4 and gas line 3 and the body of heater 1 as Fig. 3.
Fig. 2 has provided the cross-section structure of recuperative heater, these heat-accumulating burner 2 whole levels are embedded in the furnace wall 7, be distributed in the stove both sides and be heated the top of steel billet, each heat-accumulating burner 2 inside, in the middle of passage, all arrange the heat storage 15 (showing) of some amount, when cold air passes through the heat storage 15 of heat-accumulating burner 2, finish heat exchanging process as Fig. 4, communicate with burner hearth by air jet 17 (showing), directly spray in the stove as Fig. 4.
It is the structure of heat-accumulating burner 2 that Fig. 3,4 has provided, and it comprises gas port 18, air jet 17, burner block 16, heat storage 15.The air of each heat-accumulating burner 2, flue gas, coal gas have a system of one's own, and burner adopts concentric mode of jet, and gas port 18 is arranged in the burner center, and air jet 17 is evenly arranged along the coal gas peripheral direction.After air after the accumulation of heat and the coal gas ejection, meet in stove along a fixed angle, thereby can guarantee the length of flame.The air of above-mentioned each heat-accumulating burner 2, coal gas become a specific angle to arrange in heat-accumulating burner 2, finally form snail type flame, play the effect of shortening flame, also can prevent unburnt generation simultaneously.At the burner on period, coal gas (normal temperature, not preheating, not accumulation of heat) gas line 3 by heat-accumulating burner 2 enters gas flue in the burner block 16, spray in stove from burner block 16 interior gas flues, coal gas and air begin to meet in burner inside, in order to strengthen coal gas and Air mixing process, coal gas will be according to the volute passage of gas flue in the burner block 16, change trend, and in the passage of air, also be provided with the turbine guide passage, make air produce tangential-velocity component, under rotation progressive situation, meet with coal gas, guarantee that fuel and air mix in stove with bigger angle, make fuel and air finish heat exchanging process rapidly in burner hearth, the length of flame is 1 ~ 2 meter.
Concrete work implementation process is as follows:
The heat-accumulating burner of body of heater both sides relative position, its working order are divided into A condition and B state.A condition, the temperature of body of heater right side heat-accumulating burner heat storage is higher, gives the combustion air preheating, is in state of combustion; High-temperature flue gas is given the heat storage accumulation of heat in the heat-accumulating burner of left side, is in the smoke evacuation state.The B state, high-temperature flue gas carries out accumulation of heat to heat storage in the heat-accumulating burner of body of heater right side, be in the smoke evacuation state, and the temperature of left side heat-accumulating burner heat storage is higher, gives the combustion air preheating, is in state of combustion.When A condition, air, coal gas through pipeline separately by air/flue gas reversing valve, coal gas is cut the heat-accumulating burner that valve enters the right side soon, and airflow is heated near fire box temperature behind heat storage, enter burner hearth through air jet then, coal gas is gone into stove with normal temperature through gas port because air jet, gas port staggered arrangement, go into stove after, air gas burns immediately, the heating steel billet; At this moment, the left side heat-accumulating burner is in the smoke evacuation state, and high-temperature flue gas enters heat-accumulating burner from the left side spout, horizontal flow is through heat-accumulating burner, after fume afterheat passes to heat storage, enter chimney through air/flue gas reversing valve, flue, finally be discharged in the atmosphere with the temperature that is lower than 150 ℃.The situation of B state forms the alternative combustion process that goes round and begins again in contrast, and two states of A, B form a work period, time between twice commutation is fixed, guarantee the needed air themperature of burning, make also that simultaneously the flue-gas temperature of discharging is lower than 150 ℃, play energy-conservation effect.
The whole levels of heat-accumulating burner of the present invention are embedded in the furnace wall, make the heat capacity of each heat-accumulating burner increase, and under equal yield line, the more conventional recuperative heater of recuperative heater of using present technique will reduce by 1/5 in energy consumption.Air preheating temperature＞1000 ℃ (only than low 50～80 ℃ of furnace temperature), funnel temperature＜150 ℃; Thereby, can reclaim the waste heat in the flue gas significantly.
The present invention adopts full dispersion heat-accumulation combustion Controlling System, can control the homogeneity of furnace temperature, furnace pressure neatly.Reversing valve is arranged the unsafe factor that reduces crossed contamination to greatest extent and brought nearby with the burning spout.Air/flue gas reversing valve adopts three-way diverter valve, and coal gas adopts magnetic valve to carry out quick acting switching-off, and valve body is little, and is simple in structure, in light weight, safeguards that simply the valve body life-span is long; The main foundation that Controlling System is set the regenerator funnel temperature is the highest allowable temperature of flue gas dew point temperature and equipment.Generally funnel temperature is set in 130～180 ℃, adopting timing reversing is that master, constant temperature commutation are that the mode of assisting is controlled funnel temperature.
Claims (2)
1. heat accumulating type roller hearth furnace, it comprises body of heater [1], burner hearth and heat-accumulating burner [2], it is characterized in that: described heat-accumulating burner [2] is for a plurality of, in burner hearth along the furnace superintendent direction, evenly arrange on upper strata, stove both sides, gas port [18] and air jet [17] are arranged in the heat-accumulating burner [2], gas port [18] is arranged in heat-accumulating burner [2] center, air jet [17] arranges evenly that along gas port [18] peripheral direction each heat-accumulating burner [2] is connected with air line [6], gas line [3], flue [4] respectively; Gas flue in the described heat-accumulating burner [2] is the volute passage, is provided with the turbine guide passage in the air passageways; A taper coal gas shunting short tube that can make coal gas form the hollow tube-shape swirling eddy along its outer wall has been installed in the gas flue of described heat-accumulating burner [2]; The burner block [16] of described heat-accumulating burner [2] around air passageways in be laid with heat storage [15].
2. heat accumulating type roller hearth furnace according to claim 1 is characterized in that: gas line [3] has coal gas to cut valve [9] soon with the junction of heat-accumulating burner [2].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101107756A CN101775483B (en) | 2010-02-10 | 2010-02-10 | Heat accumulative roller bottom heating furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101107756A CN101775483B (en) | 2010-02-10 | 2010-02-10 | Heat accumulative roller bottom heating furnace |
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| CN101775483A CN101775483A (en) | 2010-07-14 |
| CN101775483B true CN101775483B (en) | 2011-11-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104017981B (en) * | 2014-06-05 | 2016-02-24 | 河北钢铁股份有限公司唐山分公司 | A kind of continuous casting steel billet heating process of heat accumulating type roller bottom heating furnace |
| CN108800926A (en) * | 2018-08-03 | 2018-11-13 | 忻州立泊装备制造有限公司 | Regenerative gas fire coal scrap melting stove |
| CN110425899A (en) * | 2019-08-28 | 2019-11-08 | 北京泷涛环境科技有限公司 | A kind of low nitrogen combustion apparatus of Regenerative Heating Furnace |
| CN114413250B (en) * | 2022-01-21 | 2023-10-31 | 慈溪中科众茂环保热电有限公司 | Boiler exhaust gas waste heat degree of depth recovery unit |
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| CN2721653Y (en) * | 2004-08-20 | 2005-08-31 | 唐山钢铁股份有限公司 | Heating furnace with heat stored |
| CN201083461Y (en) * | 2007-07-19 | 2008-07-09 | 宝山钢铁股份有限公司 | Heat accumulation type bar plate heating stove |
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Address after: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee after: River steel Limited by Share Ltd Tangshan branch Address before: 063016 Binhe Road, Hebei, Tangshan City, No. 9 Patentee before: Hebei Steel Co., Ltd., Tangshan Branch |