CN100510594C - Direct backheating burned flame type heating stove and working method - Google Patents
Direct backheating burned flame type heating stove and working method Download PDFInfo
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- CN100510594C CN100510594C CNB2007101392664A CN200710139266A CN100510594C CN 100510594 C CN100510594 C CN 100510594C CN B2007101392664 A CNB2007101392664 A CN B2007101392664A CN 200710139266 A CN200710139266 A CN 200710139266A CN 100510594 C CN100510594 C CN 100510594C
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Abstract
A flame-typed heating furnace by directly regenerative combustion and a working method pertain to the heating furnace technical field, and are used for solving the problem of constant switch in working state of the existing regenerative type heating furnaces. The invention comprises a furnace body, a heat-exchange device, an air-supply device and a smoke-exhaust device. The invention is characterized in that an air fuel inlet and a high-temperature smoke outlet are separately positioned at the two sides of the furnace body, and the air fuel inlet of one side is positioned correspondingly with the high-temperature smoke outlet on the other side. The working state of each opening of the furnace body in the invention needs not switch, thereby, the working state is stable. The invention still uses a high-temperature smoke exhausting method, but the heat-exchange process adopts a method of direct regeneration, thereby needing no commutation, and furnace temperature and furnace pressure are no longer frequently fluctuated, the combustion process in the furnace is very stable, therefore, the problems of easy cracking and pre-heater smelting, softening, deforming, breaking, blocking of the furnace body are solved. The furnace failure rate is greatly decreased, and the working rate is improved, both of which provide strong and powerful technical support for stable and continuous production of the heating furnace.
Description
Technical field
The present invention relates to a kind of flame-type heating furnace of high-temperature flue gas waste-heat recovery device and method of work of this heating furnace of having, belong to the heating furnace technical field.
Background technology
What at present, the known flame-type heating furnace that has the high-temperature flue gas residual neat recovering system adopted is regenerative combustion technology.Regenerative combustion technology harvests hot system, smoke evacuation system, combustion system and furnace binding, hold over system, smoke evacuation system, combustion system are arranged symmetrically in the body of heater both sides, when a side is in the smoke evacuation state when (heat cycle), opposite side is in fuel supply status (cold cycle), and the both sides state switches after a while.When heat storage was in the smoke evacuation state, high-temperature flue gas flow through heat storage and to its heat release, and heat storage obtains heat and is heated to high temperature, and flue gas is emitted the heat temperature and dropped to about 150 ℃ and enter atmosphere; When heat storage is in the fuel supply status, air and fuel flow through separately heat storage respectively and absorb heat from heat storage, heat storage is emitted the heat temperature and is descended, and air and fuel rise to about 1000 ℃ from the heat storage endothermic temperature, enters burner hearth then and fills the air the formula burning.The both sides state switches by exchange system, and 20 ~ 30 commutation cycles are per hour arranged generally speaking.The heat storage type combustion mode has been compared many advantages with traditional combustion system.The one, the heat storage type combustion mode has the advanced formula combustion system that fills the air, and it can expand to flame edge in whole burner hearth, makes fire box temperature very even, is difficult for forming localized hyperthermia, has not only improved heating quality, and can reduce oxygenation efficiency; The 2nd, the heat storage type combustion mode has very high waste heat recovery rate and temperature efficiency, empty, coal gas all can be preheated to 800-1000 ℃, not only enlarged the scope of application of fuel, make the unavailable inferior fuel of traditional heating stove (as blast furnace gas) become high-grade fuel, also greatly reduce the fuel specific of stove, reduced the discharge of harmful gases amount; The 3rd, because waste-heat recovery device can bear higher temperature, stove has been cancelled preheating section, and this makes burner hearth bulk temperature level can bring up to the highest level that heating process allows, and the specific productivity of heating furnace is improved greatly.Because above advantage, the heat storage type combustion mode is applied to rapidly in the various flame heat processes.
Although the heat storage type combustion mode has very big advantage, but, since this technology drops into the industry operation, a large amount of production practices prove, because there have been the defective that some these combustion methods self are insoluble, heating process and firing equipment had serious adverse effect from the beginning in the limitation of this technology self, heat storage type combustion mode.Well-known heat storage type combustion mode belongs to switches the backheat combustion system, exchange heat between flue gas and air, coal gas is transmitted by intermediate heat carrier (heat storage), the hot and cold cycle in the heat storage work, the switching that is accumulation of heat, exothermic process must frequently commutate and could realize by exchange system, and this frequent commutation brings the adverse effect of following several respects for the course of work of flame heating furnace:
(1) because each commutation process all will experience the process of " cut off coal gas--commutation---re-enter coal gas ", therefore each commutation all can make furnace flame disappear once, attack time is generally about three minutes, the frequent fire extinguishing of flame has caused the frequent fluctuation of furnace temperature with catching fire, this not only makes the heat transfer temperature and pressure frequently descend, cause the reduction of rate of heat transfer, also make whole furnace lining operating temperature frequent variations, cause that temperature of furnace lining stress strengthens, cause the furnace lining cracking easily, the cigarette that goes from place to place is burned with anger, increased the stove accident rate, reduce the stove operating rate, shortened converter life, had a strong impact on normal operation of stove and production process.
(2) commutation process causes fluctuating widely of furnace pressure.A large amount of production practices prove, after coal gas is cut off in commutation furnace pressure generally reduce to-30Pa about, commutation back furnace pressure can rise to suddenly again+more than the 75Pa, slowly fall after rise after the several seconds then, in each commutation cycle fluctuating widely of twice furnace pressure is being arranged.The significantly frequent fluctuation of furnace pressure makes the heating furnace robot control system(RCS) strengthen the control difficulty of pressure, the heating furnace furnace pressure is worked under certain stationary value for a long time, this just causes heating furnace work process stable inadequately, occurs combustion conditions easily and various problems such as can't accurately regulate.
(3) heat storage itself is operated in very under the high-temperature, and frequent commutation makes regenerator temperature also in frequent acute variation again, problems such as under high temperature and huge thermal shock effect, heat storage often occurs melting, softens, is out of shape, breaks, obstruction.Aborning, honeycomb type heat storage service life is generally at 3-6 month, even just a large amount of cracked situations of a week are arranged.Smoke evacuation and fuel, air supply are obstructed, have a strong impact on production.
When (4) heating furnace commutated, ducted coal gas can be drawn out of outside the stove between reversal valve and the nozzle, causes waste of fuel, and the commutation cycle is short more, and this loss is big more.
(5) because in the heat-accumulation combustion mode, burning substantially all is under the unstable state operating mode to be carried out, this just makes the burner hearth combustion process, diabatic process, the complexity of gas flow process increases greatly, add the complicated diversity of working condition, therefore be difficult to set up and produce actual being consistent, more accurate heating model, just because of this, at present automatic control of most heating furnaces and automatic adjusting level are all very low, although the devoting rate of robot control system(RCS) is very high, but utilization rate is very low, sometimes even fully abandon controlling automatically changing manual control, the heating furnace accident rate is significantly risen, the stove operating rate declines to a great extent.
By above analysis as can be seen, frequent commutation is to cause heat-accumulation combustion process instability, heating furnace accident rate height, the immediate cause that the stove operating rate is low.
Summary of the invention
The present invention be used to solve the defective of above-mentioned prior art and a kind of preheat temperature efficient height be provided, do not need to commutate, direct backheating burned flame type heating stove and method of work that heating process is stable.
The alleged problem of the present invention is solved by following technical scheme:
A kind of direct backheating burned flame type heating stove, comprise body of heater in the formation, heat-exchanger rig, air-supply arrangement and fume extractor, its special feature is: described body of heater both sides are respectively equipped with air fuel inlet and high-temperature flue gas outlet, wherein the air fuel of every side enters the mouth and the corresponding setting in opposite side high-temperature flue gas exit position, stating heat-exchanger rig is the high-performance heat exchanger that is positioned at the body of heater both sides, each high-performance heat exchanger is provided with four interfaces promptly: the low-temperature flue gas outlet, the high-temperature flue gas import, the high temperature air fuel outlet, the Cryogenic air fuel inlet, the high-temperature flue gas import of described each high-performance heat exchanger and the outlet of the high-temperature flue gas of body of heater are connected; The high temperature air fuel outlet of high-performance heat exchanger and the air fuel of body of heater inlet are connected; The low-temperature flue gas outlet and the Cryogenic air fuel inlet of high-performance heat exchanger are communicated with the flue of fume extractor and the cold air duct and the gas piping of air-supply arrangement respectively.
Above-mentioned direct backheating burned flame type heating stove, the high-temperature flue gas import of described high-performance heat exchanger is corresponding with low temperature cigarette device exit position; The high temperature air fuel outlet is corresponding with Cryogenic air fuel inlet position, is provided with honeycomb heat exchange body in the described high-performance heat exchanger, and its inwall is provided with heat-insulation layer.
Above-mentioned direct backheating burned flame type heating stove, described fume extractor is made up of the flue that is interconnected, air-introduced machine, chimney, and described air-supply arrangement is made up of the pressure fan that is interconnected, cold air duct.
Above-mentioned direct backheating burned flame type heating stove method of work, cold air and coal gas are by cold air duct and cooled coal gas pipeline, the Cryogenic air fuel inlet of high-performance heat exchanger continuously enters in the high-performance heat exchanger, heat absorption within it, be preheated to more than 800 ℃, through high temperature air outlet and be positioned at air fuel inlet on the homonymy body of heater and spray into burner hearth and carry out diffusion combustion, adopt the dispersed combustion mode in the stove, steel billet carries out leaving after the heat exchange burner hearth and enters in this side high-performance heat exchanger by the high-temperature flue gas import of the high-temperature flue gas outlet of body of heater opposite side and this side high-performance heat exchanger and emit waste heat therein in combustion product and the stove, add hot-air and coal gas, the combustion product temperature is reduced to about 150 ℃ after the low-temperature flue gas outlet enters air-introduced machine by flue, chimney enters atmosphere.
The present invention is under the situation that keeps the regenerative combustion technology advantage, overcome the defective of its existence, it still adopts the high temperature fume exhausting type, but heat transfer process adopts method of direct regeneration, need not commutation, furnace temperature, furnace pressure be frequent fluctuation no longer, combustion process in the burner hearth is highly stable, thereby, solved that the body of heater that causes because of commutation is easy to crack, preheater melts, softened, be out of shape, broken, problem such as obstruction, greatly reduce the stove accident rate, improved the stove operating rate, producing for the heating furnace steady and continuous provides powerful technical support.In addition, adopt the technology of the present invention, combustion process, diabatic process, gas flow process are all near steady-state process, relation between procedure parameter is simpler than transient, can set up more accurate heating model, help heating furnace and realize more accurate automatic control and adjusting, heating quality, heating process all are under the more excellent parameter, increased controllability, adjustability, security, the adaptability of heating furnace greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the high-performance heat exchanger structural representation;
Fig. 3 is the A-A cutaway view of Fig. 1.
Label is expressed as follows in the accompanying drawing: 1. chimney; 2. air-introduced machine; 3. flue; 4. high-performance heat exchanger; The outlet of 4-1. low-temperature flue gas; 4-2. high-temperature flue gas imports; 4-3. high temperature air fuel outlets; 4-4. Cryogenic air fuel inlets; 4-5. heat-insulation layers; 4-6 honeycomb heat exchange bodies; 5. body of heater; 5-1. air fuels inlet; The outlet of 5-2. high-temperature flue gas; 6. flame; 7. steel billet; 8. water pipe; 9. cold air duct; 10. pressure fan; 11. gas piping.
The specific embodiment
Referring to Fig. 1, comprise body of heater 5, heat-exchanger rig, air-supply arrangement and fume extractor in the formation of the direct backheating burned flame type heating stove of the present invention, body of heater 5 both sides are respectively equipped with air fuel inlet 5-1 and high-temperature flue gas outlet 5-2, the wherein air fuel of every side inlet and the corresponding setting in opposite side high-temperature flue gas exit position.The duty difference of two mouths of heating furnace body phase the same side, and a certain upper lateral part mouth is when being in the smoke evacuation state, and lower ports is in fuel and air supply status, and the opposite side upper port is in fuel and air supply status, lower ports is in the smoke evacuation state.Described fume extractor is made up of the flue 3 that is interconnected, air-introduced machine 2, chimney 1, and air-supply arrangement is made up of the pressure fan 10 that is interconnected, cold air duct 9.(annotate: what provide among Fig. 1 is the structural representation in one of them cross section of the direct backheating burned flame type heating stove of the present invention, and structure setting and working condition on other cross section are also like this.)
Referring to Fig. 1～3, described heat-exchanger rig is for being positioned at body of heater both sides high-performance heat exchanger 4, each high-performance heat exchanger is provided with four interfaces promptly: low-temperature flue gas outlet 4-1, high-temperature flue gas import 4-2, high temperature air fuel outlet 4-3, Cryogenic air fuel inlet 4-4, and the high-temperature flue gas import 4-2 of each high-performance heat exchanger is connected with the high-temperature flue gas outlet 5-2 of body of heater; The high temperature air fuel outlet 4-3 of high-performance heat exchanger is connected with the air fuel inlet 5-1 of body of heater; Flue 3 and air-supply arrangement cold air duct 9 and gas piping 11 that the low-temperature flue gas outlet 4-1 of high-performance heat exchanger and Cryogenic air fuel inlet 4-4 are communicated with fume extractor respectively.The high-temperature flue gas import 4-2 of high-performance heat exchanger is corresponding with low-temperature flue gas outlet 4-1 position; High temperature air fuel outlet 4-3 is corresponding with Cryogenic air fuel inlet 4-4 positions, is provided with honeycomb heat exchange body 4-6 in the high-performance heat exchanger, and its inwall is provided with heat-insulation layer 4-5.The effect of high-performance heat exchanger be with the exchange heat in the high-temperature flue gas to coal gas and combustion air, just the high-temperature flue gas waste heat is returned and is used for heating steel billet in the heating furnace.
High temperature air, coal gas flow after spraying into burner hearth on one side, form flame 6 Yi Bian fill the air the formula burning, and the actual boundary of flame expands to whole burner hearth circumference, and furnace temperature is very even.Flame is passed to steel billet 7 by radiation and convection heat transfer' heat-transfer by convection mode with heat, and steel billet is controlled intensification on request under even, controlled furnace temperature.8 pairs of steel billets of water pipe have supporting role, so that realize the two-sided heating to steel billet, the type of cooling of water pipe has water cooling and vaporization cooling dual mode.
Method of work of the present invention is as follows:
Band is pressed cooled coal gas and the cold air after pressure fan 10 pressurizations, continuously enter in the high-performance heat exchanger 4 by cooled coal gas pipeline 11 and cold air duct 9 through Cryogenic air fuel inlet 4-4, and in high-performance heat exchanger, absorb heat, be preheated to more than 800 ℃, spray into burner hearth and carry out diffusion combustion via high temperature air fuel outlet 4-3, air fuel inlet 5-1 then.Adopt advanced dispersed combustion mode, the border extension of flame 6 is to whole burner hearth circumference, do not have the very high torch of local temperature in the burner hearth, so furnace temperature is very even, this be very beneficial for furnace temperature accurate control, reduce steel billet oxidation, prevent to produce and add thermal defect and avoid the steel bonding accident.Combustion product and steel billet 7 carry out leaving burner hearth after the suitable heat exchange, enter in the high-performance heat exchanger 4 and emit waste heat therein through the high-temperature flue gas import 4-2 of outlet 5-2 of the high-temperature flue gas of body of heater and high-performance heat exchanger and be used for adding hot-air and coal gas, when the combustion product temperature is reduced to about 150 ℃ after enter atmosphere by low-temperature flue gas outlet 4-1, flue 3, air-introduced machine 2, chimney 1.
The method of work of above-mentioned direct backheat burning is compared maximum difference and is with existing heat storage type combustion method of work: in the regenerative combustion technology, the upper and lower part spout of heating furnace homonymy all has heat transmission equipment and duty identical, promptly be smoke evacuation state or fuel supply status simultaneously, heating furnace both sides state regularly commutates.In the direct backheat combustion method of the present invention, on the body of heater, the shared same heat exchanger of lower ports, heat exchange is uninterruptedly carried out continuously, the homonymy upper port is different with the duty of lower ports, this just makes the duty of each mouthful constant, act as a fuel and the mouth of air supply can enter the mouth as burning forever, as the smoke evacuation the mouth forever as exhaust opening, each mouthful duty need not be switched, flame does not have disruption, combustion process, the gas flow process, diabatic process is steady-state process, eliminated furnace temperature, the phenomenon of furnace pressure frequent fluctuation makes heating furnace Combustion Process Control and adjusting, diabatic process control and the precision of regulating improve greatly, and the heating quality of steel billet has had guaranteed conditions preferably, heating furnace productivity ratio is improved largely simultaneously, and the availability of robot control system(RCS) also improves greatly.In addition, after furnace temperature, furnace pressure were stablized, body of heater, heat exchanger were no longer worked under heat is shaken state, and accident rate greatly reduces, and the life-span has prolonged greatly, and the stove operating rate has also improved greatly.
Claims (4)
1. direct backheating burned flame type heating stove, comprise body of heater in the formation, heat-exchanger rig, air-supply arrangement and fume extractor, it is characterized in that: described body of heater (5) both sides are respectively equipped with air fuel inlet (5-1) and high-temperature flue gas outlet (5-2), wherein the air fuel of every side enters the mouth and the corresponding setting in opposite side high-temperature flue gas exit position, described heat-exchanger rig is the high-performance heat exchanger (4) that is positioned at the body of heater both sides, each high-performance heat exchanger is provided with four interfaces promptly: low-temperature flue gas outlet (4-1), high-temperature flue gas import (4-2), high temperature air fuel outlet (4-3), Cryogenic air fuel inlet (4-4), the high-temperature flue gas import (4-2) of described each high-performance heat exchanger is connected with the high-temperature flue gas of body of heater outlet (5-2); The high temperature air fuel outlet (4-3) of high-performance heat exchanger is connected with the air fuel of body of heater inlet (5-1); The low-temperature flue gas outlet (4-1) and the Cryogenic air fuel inlet (4-4) of high-performance heat exchanger are communicated with the flue (3) of fume extractor and the cold air duct (9) and the gas piping (11) of air-supply arrangement respectively.
2. direct backheating burned flame type heating stove according to claim 1 is characterized in that: the high-temperature flue gas import (4-2) of described high-performance heat exchanger is corresponding with low-temperature flue gas outlet (4-1) position; High temperature air fuel outlet (4-3) is corresponding with Cryogenic air fuel inlet (4-4) position, is provided with honeycomb heat exchange body (4-6) in the described high-performance heat exchanger, and its inwall is provided with heat-insulation layer (4-5).
3. direct backheating burned flame type heating stove according to claim 2, it is characterized in that: described fume extractor is made up of the flue that is interconnected (3), air-introduced machine (2), chimney (1), and described air-supply arrangement is made up of the pressure fan that is interconnected (10), cold air duct (9).
4. direct backheating burned flame type heating stove method of work according to claim 3, it is characterized in that: cold air and coal gas are by cold air duct (9) and gas piping (11), the Cryogenic air fuel inlet (4-4) of high-performance heat exchanger continuously enters in the high-performance heat exchanger (4), heat absorption within it, be preheated to more than 800 ℃, spray into burner hearth through high temperature air fuel outlet (4-3) and the air fuel inlet (5-1) that is positioned at the body of heater homonymy and carry out diffusion combustion, adopt the dispersed combustion mode in the stove, steel billet (7) carries out leaving after the heat exchange burner hearth and enters in this side high-performance heat exchanger by the high-temperature flue gas import (4-2) of the high-temperature flue gas outlet (5-2) of body of heater opposite side and this side high-performance heat exchanger and emit waste heat therein in combustion product and the stove, add hot-air and coal gas, the combustion product temperature is reduced to about 150 ℃ after low-temperature flue gas outlet (4-1) enters air-introduced machine (2) by flue (3), chimney (1) enters atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101392664A CN100510594C (en) | 2007-08-24 | 2007-08-24 | Direct backheating burned flame type heating stove and working method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101392664A CN100510594C (en) | 2007-08-24 | 2007-08-24 | Direct backheating burned flame type heating stove and working method |
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| Publication Number | Publication Date |
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| CN101113872A CN101113872A (en) | 2008-01-30 |
| CN100510594C true CN100510594C (en) | 2009-07-08 |
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| CNB2007101392664A Expired - Fee Related CN100510594C (en) | 2007-08-24 | 2007-08-24 | Direct backheating burned flame type heating stove and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878817A (en) * | 2012-09-25 | 2013-01-16 | 北京神雾环境能源科技集团股份有限公司 | Continuous combusting regenerative industrial furnace |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225018B (en) * | 2013-05-08 | 2014-08-06 | 石家庄新华能源环保科技股份有限公司 | Air and gas two-heat-accumulation heating furnace |
| CN104949127A (en) * | 2015-05-27 | 2015-09-30 | 李延新 | Single-furnace-body two-way-combustion low-nitrogen furnace profile |
| US10281143B2 (en) * | 2017-01-13 | 2019-05-07 | Rheem Manufacturing Company | Pre-mix fuel-fired appliance with improved heat exchanger interface |
| CN107955865B (en) * | 2017-12-29 | 2024-03-26 | 中钢集团鞍山热能研究院有限公司 | Trolley type heat treatment equipment with U-shaped flame for reciprocating heating and treatment method thereof |
| CN110887377A (en) * | 2019-12-04 | 2020-03-17 | 肇庆鸿立设备有限公司 | Aluminum alloy heat storage dispersion type smelting furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5062409A (en) * | 1989-08-17 | 1991-11-05 | Nepon Company, Ltd | Hot-air furnace |
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2007
- 2007-08-24 CN CNB2007101392664A patent/CN100510594C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5062409A (en) * | 1989-08-17 | 1991-11-05 | Nepon Company, Ltd | Hot-air furnace |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102878817A (en) * | 2012-09-25 | 2013-01-16 | 北京神雾环境能源科技集团股份有限公司 | Continuous combusting regenerative industrial furnace |
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| CN101113872A (en) | 2008-01-30 |
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