CN101871042A - Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit - Google Patents

Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit Download PDF

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Publication number
CN101871042A
CN101871042A CN201010210017A CN201010210017A CN101871042A CN 101871042 A CN101871042 A CN 101871042A CN 201010210017 A CN201010210017 A CN 201010210017A CN 201010210017 A CN201010210017 A CN 201010210017A CN 101871042 A CN101871042 A CN 101871042A
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CN
China
Prior art keywords
water
interchanger
user
flue gas
low temperature
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CN201010210017A
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Chinese (zh)
Inventor
田发禹
李楠
郑剑辉
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中冶南方(武汉)威仕工业炉有限公司
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Priority to CN201010210017A priority Critical patent/CN101871042A/en
Publication of CN101871042A publication Critical patent/CN101871042A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention provides a method and a device for reusing flue gas waste heat of an annealing furnace of a continuous annealing unit. The method utilizes superheated water as a carrier and recovers flue gas waste heat with the temperature about 380-420 DEG C after primary waste heat reclamation so as to provide a heat source for users of the annealing unit at other procedures. The device is provided with a flue gas/superheated water heat exchanger (1), one end thereof is communicated with a low temperature water return pipeline (9), and the other end thereof is communicated with a superheated water delivery duct (8); and the device also is provided with a user heat exchanger (4) at a cleaning section, a heated-air drying user heat exchanger (5) after the cleaning section, a heated-air drying user heat exchanger (5) after water quenching and other user heat exchangers (7), one end of each user heat exchanger is communicated with the superheated water delivery duct via a valve bank (3), and the other end of each user heat exchanger is communicated with the low temperature water return pipeline via a valve bank. The invention has the advantages of energy conservation, small investment, simple operation, safety, easy control and the like.

Description

Annealing furnace in the continuous annealing unit " fume afterheat " utilize method and device again
Technical field
The present invention relates to energy-saving field, particularly relate to the annealing furnace in a kind of continuous annealing unit " fume afterheat " utilize method again.
Background technology
Along with the continuous progress of society and the continuous development of science and technology, energy shortage and environmental issue become the significant problem of the serious puzzlement national economic development, this forces industrial sector to continually develop and utilize new forms of energy on the one hand, adopt conservation measures on the other hand, promptly constantly employ new technology on the production technique, novel process updates old production technique and working condition is able to energy-conservation.
In the continuous annealing unit, the continuous annealing furnace energy consumption is occupied sizable ratio, and reduce cost, save energy etc. becomes the emphasis that annealing furnace is paid close attention to.Continuous annealing unit annealing furnace is mainly used in the rolling back recrystallization annealing of cold rolled strip, eliminates cold hardening, and the strip steel annealing volume of excellent performance, great surface quality is provided for building, household electrical appliances, automobile and other industries.Its technology is generally the cold technology of heating-soaking-slow cooling-cold soon-overaging-end.
The coal gas type of heating is generally adopted in the heating of annealing furnace, adopt radiator tube form type of heating: after the gas-fired, high-temperature flue gas flows along radiator tube, earlier by radiator tube radiation heating band steel, by after air/the flue gas heat exchange device adds warm air, discharge through the radiator tube smoke exhaust pipe more then.Described radiator tube is a W type radiator tube.
The principle of work of W type radiator tube is: as shown in Figure 2, radiator tube 11 smoke evacuation ends are equipped with air/flue gas heat exchange device 12, the air of combustion-supporting effect 14 enters in the inlet of cold air pipe, after air/flue gas heat exchange device 12 heating, enter into burner 17 from vertical ducting 15, the coal gas that infeeds at burner 17 ends and gas inlet pipe 16 mixes after lighting a fire and burns, and products of combustion flows along direction shown in the arrow in radiator tube 11.In the process of flow of flue gas, the heat of high-temperature flue gas constantly passes to the band steel by radiator tube 11, reaches the purpose of heating zone steel.Flue gas is after after air/flue gas heat exchange device 12 adds warm air, discharge from smoke exhaust pipe 13.
After tested, the heat of taking away because of flue gas in the annealing furnace accounts for about 28% of whole heat supplied.Higher because of the flue gas funnel temperature, tend to utilize the waste heat of flue gas to come the preheating zone steel.For save energy, when entering in the stove, the band steel adds preheating section, after fume afterheat heated protective atmosphere, the protective atmosphere after heating is blowed to the band steel by recirculation blower, thus the heating zone steel, this is heat recovery for the first time.Through after the current UTILIZATION OF VESIDUAL HEAT IN, the last waste heat supply temperature of flue gas also has about 380~420 ℃, and it need be by mixing the cold wind cooling after chimney is discharged.
In the continuous annealing unit, except that the heating of band steel needs the energy, the warm air drying after other operation such as cleaning section, cleaning back are with the steel warm air drying and are gone out the stove shrend etc. all needs thermal source, and generally, these required thermals source provide by steam.
Summary of the invention
Technical problem to be solved by this invention is: what annealing furnace " fume afterheat " in a kind of continuous annealing unit was provided utilizes method and device again, its can flue gas is last about 380~420 ℃ fume afterheat as the required thermal source of annealing unit other operations, thereby for save energy with reduce product cost and make contributions.
The present invention solves its technical problem and adopts following technical scheme:
Annealing furnace " fume afterheat " utilizes method again in the continuous annealing unit provided by the invention; specifically: with " superheated water " is the mode of carrier; high-temperature flue gas process 380~420 ℃ of fume afterheats that flue gas/the protective atmosphere interchanger is implemented after the heat recovery for the first time to annealing furnace in the continuous annealing unit reclaim once more, for other operations of annealing unit user provides thermal source.
The present invention can adopt the method that may further comprise the steps:
The first step, with the flue gas after the heat recovery first time through flue gas/" superheated water " interchanger to from 80~95 ℃ " water at low temperature " heating, make this " water at low temperature " be heated into " superheated water " about 120~150 ℃;
Second step was delivered to each user with " superheated water " transport pipe with described " superheated water ", and about 140~160 ℃ low-temperature flue gas after the heat exchange is simultaneously discharged through chimney;
The 3rd step, open the valve group of each user front and back, after warm air drying user interchanger, the shrend after warm air drying user interchanger and other user's interchanger heat exchange, " superheated water " becomes " water at low temperature " after each user's interchanger is cleaning section user interchanger, cleaning section;
The 4th step under the effect of recycle pump, was back to flue gas/superheated water interchanger with the 3rd step described " water at low temperature " with " water at low temperature " Returning pipe, made this " water at low temperature " be heated into 120~150 ℃ of left and right sides high temperature " superheated water " once more;
Through above-mentioned recycle step of going round and beginning again, realize utilization again to " fume afterheat " of the annealing furnace in the continuous annealing unit.
The re-use device of annealing furnace " fume afterheat " in the continuous annealing unit provided by the invention, its structure is: be provided with flue gas/" superheated water " interchanger, the one end is communicated with " water at low temperature " Returning pipe by recycle pump, and its other end is communicated with " superheated water " transport pipe; Be provided with warm air drying user interchanger and other user's interchanger after warm air drying user interchanger after cleaning section user interchanger, the cleaning section, the shrend, each is communicated with their end with " superheated water " transport pipe by a valve group, and each is communicated with their the other end with " water at low temperature " Returning pipe by a valve group.
The present invention compared with prior art has following main beneficial effect:
1. utilize again through fume afterheat, can reclaim the energy about 12% once more, save energy.
2. utilize " superheated water " as the conveying heat energy carrier, less investment, it is little to produce maintenance.
3. utilize " superheated water " as carrying heat energy carrier, system is simple to operation, and safety is control easily.
Description of drawings
Fig. 1 is the structural representation of fume afterheat re-use device of the present invention.
Fig. 2 is the structural representation of the present W type radiator tube that uses.
Among the figure: 1. flue gas/" superheated water " interchanger; 2. recycle pump; 3. valve group; 4. cleaning section user interchanger; 5. warm air drying user interchanger after the cleaning section; 6. warm air drying user interchanger after the shrend; 7. other user's interchanger; 8. " superheated water " transport pipe; 9. " water at low temperature " Returning pipe; 10. flue gas/protective atmosphere interchanger; 11. radiator tube; 12. air/flue gas heat exchange device; 13. smoke exhaust pipe; 14. inlet of cold air pipe; 15. vertical ducting; 16. gas inlet pipe; 17. burner.
Embodiment
What the invention provides annealing furnace in the continuous annealing unit " fume afterheat " utilizes method again; this method is to be the mode of carrier with " superheated water "; 380~420 ℃ of left and right sides fume afterheats enforcements that 700 ℃ of left and right sides high-temperature flue gas of annealing furnace in the continuous annealing unit are implemented after the heat recovery for the first time through flue gas/protective atmosphere interchanger 10 are reclaimed once more, for other operations of annealing unit user provides thermal source.
The present invention adopts the method that may further comprise the steps, referring to Fig. 1:
The first step through " water at low temperature " heating from about 80~95 ℃ of 1 pair of flue gas/superheated water interchanger, makes this " water at low temperature " be heated into high temperature " superheated water " about 120~150 ℃ the flue gas after the heat recovery first time;
Second step was delivered to each user with " superheated water " that produces with " superheated water " transport pipe 8, and 140~160 ℃ of left and right sides low-temperature flue gas after the heat exchange are simultaneously discharged through chimney;
The 3rd step, open the valve group 3 of each user front and back, after warm air drying user interchanger 5, the shrend after warm air drying user interchanger 6 and other user's interchanger 7 heat exchange, " superheated water " becomes " water at low temperature " after each user's interchanger is cleaning section user interchanger 4, cleaning section;
The 4th step under the effect of recycle pump 2, was back to flue gas/superheated water interchanger 1 with the 3rd step described " water at low temperature " with " water at low temperature " Returning pipe 9, made this " water at low temperature " be heated into 120~150 ℃ of left and right sides high temperature " superheated water " once more;
Through above-mentioned recycle step of going round and beginning again, realize utilization again to " fume afterheat " of the annealing furnace in the continuous annealing unit.
Among Fig. 1: the flow direction of user " water at low temperature " after the flow direction of " superheated water " after " A " arrow is represented to heat, " B " arrow are represented to heat, " C " arrow is represented the flow direction of flue gas.
For realizing above-mentioned method, the invention provides the re-use device of annealing furnace in the continuous annealing unit " fume afterheat ", this device mainly is made up of interchanger and transport pipe, as shown in Figure 1: be provided with flue gas/" superheated water " interchanger 1, the one end is communicated with " water at low temperature " Returning pipe 9 by recycle pump 2, and its other end is communicated with " superheated water " transport pipe 8.Be provided with warm air drying user interchanger 6 and other user's interchanger 7 after warm air drying user interchanger 5 after cleaning section user interchanger 4, the cleaning section, the shrend, each is communicated with their end with " superheated water " transport pipe 8 by a valve group 3, and each is communicated with their the other end with " water at low temperature " Returning pipe 9 by a valve group 3.
Above-mentioned flue gas/" superheated water " interchanger 1 can adopt water/gas finned heat exchanger.
Above-mentioned flue gas/protective atmosphere interchanger 10 can adopt gas/air-tube type interchanger.
Described valve group 3 can adopt stopping valve.
Described other user's interchanger 7 is meant water/water-to-water heat exchanger, and this interchanger can adopt plate-type heat exchanger.
Described cleaning section user's interchanger 4 can adopt water/water plate-type heat exchanger.
Warm air drying user interchanger 5 after the described cleaning section can adopt water/gas finned heat exchanger.
Warm air drying user interchanger 6 can adopt water/gas finned heat exchanger after the described shrend.

Claims (8)

1. " fume afterheat " of the annealing furnace in the continuous annealing unit utilizes method again; it is characterized in that with " superheated water " being the mode of carrier; high-temperature flue gas process 380~420 ℃ of fume afterheats that flue gas/protective atmosphere interchanger (10) is implemented after the heat recovery for the first time to annealing furnace in the continuous annealing unit reclaim once more, for other operations of annealing unit user provides thermal source.
2. the method for utilizing again according to claim 1 is characterized in that this method specifically is to adopt the method that may further comprise the steps:
The first step, with the flue gas after the heat recovery first time through flue gas/" superheated water " interchanger (1) to " water at low temperature " about from 80~95 ℃ heating, make this " water at low temperature " be heated into " superheated water " about 120~150 ℃;
Second step was delivered to each user with " superheated water " transport pipe (8) with described " superheated water ", and about 140~160 ℃ low-temperature flue gas after the heat exchange is simultaneously discharged through chimney;
The 3rd step, open the valve group (3) of each user front and back, after warm air drying user interchanger (5), the shrend after warm air drying user interchanger (6) and other user's interchanger (7) heat exchange, " superheated water " becomes " water at low temperature " after each user's interchanger is cleaning section user interchanger (4), cleaning section;
The 4th step under the effect of recycle pump (2), was back to flue gas/superheated water interchanger (1) with the 3rd step described " water at low temperature " with " water at low temperature " Returning pipe (9), made this " water at low temperature " be heated into 120~150 ℃ of left and right sides high temperature " superheated water " once more;
Through above-mentioned recycle step of going round and beginning again, realize utilization again to " fume afterheat " of the annealing furnace in the continuous annealing unit.
3. realize claim 1 or the 2 described devices that utilize method again for one kind, it is characterized in that this device is provided with flue gas/" superheated water " interchanger (1), the one end is communicated with " water at low temperature " Returning pipe (9) by recycle pump (2), and its other end is communicated with " superheated water " transport pipe (8); Be provided with warm air drying user interchanger (6) and other user's interchanger (7) after warm air drying user interchanger (5) after cleaning section user interchanger (4), the cleaning section, the shrend, each is communicated with their end with " superheated water " transport pipe (8) by a valve group (3), and each is communicated with their the other end with " water at low temperature " Returning pipe (9) by a valve group (3).
4. device according to claim 3 is characterized in that described valve group (3) adopts stopping valve.
5. device according to claim 3 is characterized in that described other user's interchanger (7) is meant water/water-to-water heat exchanger, and this interchanger adopts plate-type heat exchanger.
6. device according to claim 3 is characterized in that warm air drying user interchanger (5) adopts water/gas finned heat exchanger after the described cleaning section.
7. device according to claim 3 is characterized in that described cleaning section user's interchanger (4) adopts water/water plate-type heat exchanger.
8. device according to claim 3 is characterized in that warm air drying user interchanger (6) adopts water/gas finned heat exchanger after the described shrend.
CN201010210017A 2010-06-25 2010-06-25 Method and device for reusing flue gas waste heat of annealing furnace of continuous annealing unit CN101871042A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012169A (en) * 2010-12-28 2011-04-13 中冶南方(武汉)威仕工业炉有限公司 Method for secondarily recycling smoke gas waste heat of continuous annealing furnace
CN102032804A (en) * 2010-12-29 2011-04-27 奇瑞汽车股份有限公司 Waste gas afterheat recovery system
CN102538488A (en) * 2011-10-19 2012-07-04 苏州新思气体系统有限公司 Tail-gas purifying and recycling device and process of cover type bright annealing furnace system
CN102586549A (en) * 2012-02-29 2012-07-18 中冶南方工程技术有限公司 System for utilizing waste heat of flue gas of annealing furnace
CN103045843A (en) * 2012-12-28 2013-04-17 中冶南方(武汉)威仕工业炉有限公司 Superheated water pressure stabilizing system for continuous annealing furnace
CN104344730A (en) * 2013-08-02 2015-02-11 上海振世能源科技有限公司 Smoke waste heat recycling system
CN104456526A (en) * 2014-11-26 2015-03-25 电能(北京)节能技术有限公司 Boiler flue gas waste heat recovery and recycle system
CN108149001A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of jet heating system and its control method
CN108148999A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of pre-heating system and its pre-heating mean suitable for continuous annealing and galvanizing
CN108148956A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of jumbo jet heating equipment of continuous annealing unit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101173324A (en) * 2006-10-31 2008-05-07 黄石山力科技发展有限公司 Novel technique for comprehensive utilization of continuous strip annealing furnace flue gas exhaust heat and device thereof
CN101260816A (en) * 2008-04-18 2008-09-10 朱学仪 Method and device for reclaiming and utilizing billet residual heat

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101173324A (en) * 2006-10-31 2008-05-07 黄石山力科技发展有限公司 Novel technique for comprehensive utilization of continuous strip annealing furnace flue gas exhaust heat and device thereof
CN101260816A (en) * 2008-04-18 2008-09-10 朱学仪 Method and device for reclaiming and utilizing billet residual heat

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102012169B (en) * 2010-12-28 2013-02-27 中冶南方(武汉)威仕工业炉有限公司 Method for secondarily recycling smoke gas waste heat of continuous annealing furnace
CN102012169A (en) * 2010-12-28 2011-04-13 中冶南方(武汉)威仕工业炉有限公司 Method for secondarily recycling smoke gas waste heat of continuous annealing furnace
CN102032804A (en) * 2010-12-29 2011-04-27 奇瑞汽车股份有限公司 Waste gas afterheat recovery system
CN102538488B (en) * 2011-10-19 2013-10-23 苏州新思气体系统有限公司 Tail-gas purifying and recycling device and process of cover type bright annealing furnace system
CN102538488A (en) * 2011-10-19 2012-07-04 苏州新思气体系统有限公司 Tail-gas purifying and recycling device and process of cover type bright annealing furnace system
CN102586549A (en) * 2012-02-29 2012-07-18 中冶南方工程技术有限公司 System for utilizing waste heat of flue gas of annealing furnace
CN102586549B (en) * 2012-02-29 2014-08-13 中冶南方工程技术有限公司 System for utilizing waste heat of flue gas of annealing furnace
CN103045843A (en) * 2012-12-28 2013-04-17 中冶南方(武汉)威仕工业炉有限公司 Superheated water pressure stabilizing system for continuous annealing furnace
CN103045843B (en) * 2012-12-28 2015-01-07 中冶南方(武汉)威仕工业炉有限公司 Superheated water pressure stabilizing system for continuous annealing furnace
CN104344730A (en) * 2013-08-02 2015-02-11 上海振世能源科技有限公司 Smoke waste heat recycling system
CN104456526A (en) * 2014-11-26 2015-03-25 电能(北京)节能技术有限公司 Boiler flue gas waste heat recovery and recycle system
CN108149001A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of jet heating system and its control method
CN108148999A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of pre-heating system and its pre-heating mean suitable for continuous annealing and galvanizing
CN108148956A (en) * 2016-12-02 2018-06-12 宝山钢铁股份有限公司 A kind of jumbo jet heating equipment of continuous annealing unit
CN108148956B (en) * 2016-12-02 2019-10-25 宝山钢铁股份有限公司 A kind of jumbo jet heating equipment of continuous annealing unit

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