CN101788233A - Heating-furnace cogeneration system and method thereof - Google Patents
Heating-furnace cogeneration system and method thereof Download PDFInfo
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- CN101788233A CN101788233A CN201010114344A CN201010114344A CN101788233A CN 101788233 A CN101788233 A CN 101788233A CN 201010114344 A CN201010114344 A CN 201010114344A CN 201010114344 A CN201010114344 A CN 201010114344A CN 101788233 A CN101788233 A CN 101788233A
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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
- Y02E20/14—Combined heat and power generation [CHP]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention relates to a heating-furnace cogeneration system and a method thereof, and belongs to the field of waste energy and heat recovery. The cogeneration system comprises a heating furnace, a heating-furnace waste heat boiler, a heating-furnace air preheater, a heating-furnace heat-pipe coal gas preheater, a heating-furnace tail suction fan, a superheated steam boiler, a turbogenerator set and a chemical water system, wherein the heating-furnace tail is orderly provided with the heating-furnace waste heat boiler, the heating-furnace air preheater, the heating-furnace heat-pipe coal gas preheater and the heating-furnace tail suction fan along the fume flow direction, and used for recovering the fume waste heat of the heating furnace; the heating-furnace waste heat boiler is used for generating electricity; and the chemical water system is used for providing supplementary water for the heating-furnace waste heat boiler and the superheated steam boiler. The invention enables the superheated steam boiler to still ensure the low-load stable operation of the cogeneration system when heating furnace is to be rolled, increases the steam parameter of the heating-furnace waste heat generating equipment by utilizing the superheated steam boiler, and enhances the generating efficiency. The invention maximally recovers the waste heat of the heating furnace, thereby having favorable economic and environmental benefits and high values for application and popularization.
Description
Technical field
The invention belongs to complementary energy heat recovery field, particularly a kind of heating-furnace cogeneration system and method thereof are applicable to steel plant's heater for rolling steel cogeneration.
Background technology
Iron and steel enterprise's heater for rolling steel directly affects the production cost of enterprise as the energy consumption rich and influential family.Generally about 30%, energy consumption height, using energy source level are low, have caused a large amount of energy wastes as a kind of thermal efficiency of firing equipment for general heating furnace.Therefore reclaiming the existing good economic benefits of heating furnace waste heat has certain environmental benefit again.
At present, iron and steel enterprise adopts vaporization cooling walking beam heating furnace more, and general fuel is mixed gas, and fume exhausting type is a natural draught system.Heating furnace preheating section exhaust gas temperature is generally at 850-900 ℃, and common use is mixed air-cooler and reduced exhaust gas temperature protection air preheater and gas preheating device.Mixing under the situation that air-cooler puts into operation heating furnace tail exhaust gas temperature still more than 400 ℃.Mainly taking the waste heat recovery mode at present is to utilize heating furnace smoke evacuation carrying out in back-end ductwork air preheat, gas preheating, perhaps arranges that at back-end ductwork waste heat boiler produces steam, the direct generation of electricity.There are some problems in these waste heat recovery modes in actual moving process: (1) adopts air preheat, gas preheating only to reclaim the partial fume heat, and recovery waste heat is limited in one's ability.(2) adopt the direct generation of electricity of waste heat recovery steam, because the steam parameter that waste heat boiler produced is low, direct generation of electricity efficient is low.(3) because heating furnace is often to be rolled, the steam that causes waste heat boiler to produce is discontinuous, and afterheat generating system can not stable operation.
In view of above-mentioned defective, should improve heating furnace waste heat recovery mode, its key problem is exactly as far as possible efficiently to utilize the waste heat of recovery, solves the to be rolled and heating-furnace cogeneration system of heating furnace simultaneously and needs the contradiction between the operation continuously.
Summary of the invention
The object of the present invention is to provide heating-furnace cogeneration system and method thereof, at first by configuration to the superheated steam boiler combustion system, make superheated steam boiler under heating furnace situation to be rolled, still can guarantee the stable operation of afterheat generating system underload, solved and produced discontinuous when heating furnace is to be rolled and problem that afterheat generating system that cause can't move continuously; Next utilizes superheated steam boiler to improve heating-furnace cogeneration equipment steam parameter, has improved generating efficiency; Last the present invention has carried out reclaiming to greatest extent to the heating furnace waste heat, and good economic benefits and environmental benefit are arranged, and has application and promotional value preferably.Maximum possible reclaims waste heat of flue gas of heating furnace; Improve residual heat generating efficiency as far as possible; Contradiction between solving that heating furnace is to be rolled and needing to move continuously with heating-furnace cogeneration system.
System of the present invention comprises heating furnace, heating furnace waste heat boiler, heating furnace air preheater, heating furnace heat pipe-type gas preheating device, heating furnace tail induced-draught fan, superheated steam boiler, Turbo-generator Set, chemical water system etc.The present invention arranges heating furnace waste heat boiler, heating furnace air preheater, heating furnace heat pipe-type gas preheating device, heating furnace tail induced-draught fan at the heating furnace afterbody successively along flue gas flow direction, fully reclaims waste heat of flue gas of heating furnace.The saturated vapor that the heating furnace waste heat boiler produces enters superheated steam boiler and further improves and enter Turbo-generator Set after the temperature and generate electricity.The chemical water system is mainly the heating furnace waste heat boiler and superheated steam boiler provides supplementing water.
Chemical water of the present invention system handles former water, reduces hardness of water and salt content, for heating furnace waste heat boiler and superheated steam boiler provide chemistry filled water.
The technology of cogeneration of the present invention comprises the carbonated drink circulation process of waste heat of flue gas of heating furnace recovery process and Turbo-generator Set; Concrete technology is as follows:
The waste heat of flue gas of heating furnace recovery process: 1000 ℃-850 ℃ of heating furnace preheating section exhaust gas temperatures (looking feeding temperature situation difference to some extent), behind heating furnace waste heat boiler recovery heat generation saturated vapor, exhaust gas temperature is 650 ℃-550 ℃.Behind the flue gas process heating furnace air preheater preheated air, exhaust gas temperature is 300 ℃-250 ℃.Behind the flue gas process heating furnace gas preheating device preheating gas, exhaust gas temperature is reduced to 150 ℃.Flue gas of heating furnace enters the heating furnace chimney through heating furnace tail induced-draught fan at last, finally enters atmosphere.In the present invention, original air-cooler of mixing needn't move.
The carbonated drink circulation process of Turbo-generator Set: the saturated vapor that the heating furnace waste heat boiler produces is sent into the superheater influent header of superheated steam boiler, and saturated vapor is sent into Turbo-generator Set behind the Turbo-generator Set nominal parameter and generated electricity through overheated reaching.The condensate water that Turbo-generator Set produces is sent into low-pressure heater through condensate pump, the thermal source of low-pressure heater is provided by the saturated vapor that heating furnace water beam vaporization cooling drum produces, heated condensate water is sent into high-pressure heater by feed pump after entering the higher-pressure deaerator deoxygenation.High-pressure feed water sends into superheated steam boiler respectively and the heating furnace waste heat boiler carries out the carbonated drink circulation.The hydrophobic of low-pressure heater delivered to the low pressure oxygen-eliminating device by drainage pump after flowing into lower water box, enter heating furnace water beam vaporization cooling recirculation system.The heating furnace water beam vaporization cooling institute saturated vapor that produces is no longer directly supplied plant area's pipe network, changes by the adjusting of the Turbo-generator Set supply of drawing gas.
Main innovate point of the present invention is:
(1) utilizes the adjusting of superheated steam boiler evaporation capacity, the contradiction between solving that heating furnace is to be rolled and needing to move continuously with heating-furnace cogeneration system.
(2) improve the electricity generation system steam parameter by superheated steam boiler, improve the generating efficiency of waste heat recovery steam.
(3) the heating furnace exhaust gas temperature is reduced to 150 ℃, the heating furnace waste heat recovery level that reaches capacity.
Good effect of the present invention is as follows:
(1) it is overheated that the heating furnace waste heat boiler mixes the back with superheated steam boiler institute producing steam, guarantees the stable operation of electricity generation system.To be rolled in the heating furnace generation, under the situation that heating furnace waste heat boiler steam production descends.Superheated steam boiler produces a part of steam as a supplement, has guaranteed the stable of the required steam of electricity generation system.Solve the to be rolled and heating-furnace cogeneration system of heating furnace like this and needed the contradiction between the operation continuously.
(2) saturated vapor of heating furnace waste heat boiler generation improves steam parameter by superheated steam boiler, improves residual heat generating efficiency.The saturated vapor that the heating furnace waste heat boiler produces mixes at the superheater influent header of superheated steam boiler with the saturated vapor that superheated steam boiler is produced, deliver to and carry out overheatedly in the superheated steam boiler, reach and enter electricity generation system after the unit requirement parameter and generate electricity.
(3) superheated steam boiler adopts movable flame central burner system, guarantees superheated steam boiler stable operation under underload.The superheated steam boiler flame kernel can move up and down with working conditions change.When heating furnace normally moves, move on the flame kernel, the evaporation capacity of boiler descends; When heating furnace was to be rolled, flame kernel moves down boiler capacity to be increased.Guaranteed the stable operation of Turbo-generator Set.
(4) cascade utilization waste heat of flue gas of heating furnace is arranged waste heat boiler, air preheater, gas preheating device successively according to different temperature requirements, and exhaust gas temperature is reduced to 150 ℃, and waste heat recovery is reached capacity.
(5) replace original low-pressure heater is drawn gas with heating furnace vaporization cooling step rate institute producing steam, further efficiently utilize the heating furnace waste heat to improve generating efficiency.
Major technique advantage of the present invention: (1) utilizes superheated steam boiler, has guaranteed the stable operation of afterheat generating system.(2) by superheated steam boiler, improved the parameter of waste heat recovery steam, improved generating efficiency.In addition, the present invention does not carry out big change to heating furnace, does not influence the original performance of heating furnace, and investment is short return period, instant effect.
The present invention has carried out important improvement to existing heating-furnace cogeneration technology, has good application and promotional value.
Description of drawings
Fig. 1 is a heating furnace heat-recovering generating plant system schematic of the present invention.Wherein, heating furnace 1, heating furnace waste heat boiler 2, heating furnace air preheater 3, heating furnace gas preheating device 4, heating furnace tail induced-draught fan 5, heating furnace air blast 6, Turbo-generator Set 7, condensate pump 8, low-pressure heater 9, higher-pressure deaerator 10, feed pump 11, high-pressure heater 12, superheated steam boiler 13, low level drain tank 14, drainage pump 15, low pressure oxygen-eliminating device 16, vaporization are cooled off drum 17, water beam coolant circulation pump 18, are mixed air-cooler 19, heating furnace chimney 20.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
System of the present invention comprises heating furnace 1, heating furnace waste heat boiler 2, heating furnace air preheater 3, heating furnace heat pipe-type gas preheating device 4, heating furnace tail induced-draught fan 5, superheated steam boiler 13, Turbo-generator Set 7, chemical water system etc.The present invention arranges heating furnace waste heat boiler 2, heating furnace air preheater 3, heating furnace heat pipe-type gas preheating device 4, heating furnace tail induced-draught fan 5 at heating furnace 1 afterbody successively along flue gas flow direction, fully reclaims waste heat of flue gas of heating furnace.The saturated vapor that heating furnace waste heat boiler 2 produces enters superheated steam boiler 13 and further improves and enter Turbo-generator Set 7 after the temperature and generate electricity.The chemical water system is mainly the heating furnace waste heat boiler and superheated steam boiler provides supplementing water.
Referring to accompanying drawing 1, heating furnace heat-recovering generating plant system schematic of the present invention.The waste heat of flue gas of heating furnace recovery process: 1000 ℃-850 ℃ of heating furnace 1 preheating section exhaust gas temperatures (looking feeding temperature situation difference to some extent), behind heating furnace waste heat boiler 2 recovery heats generation saturated vapors, exhaust gas temperature is about 650 ℃-550 ℃.Behind flue gas process heating furnace air preheater 3 preheated airs, exhaust gas temperature is about 300 ℃-250 ℃.Behind flue gas process heating furnace gas preheating device 4 preheating gas, exhaust gas temperature is reduced to about 150 ℃.Flue gas of heating furnace enters heating furnace chimney 20 through heating furnace tail induced-draught fan 5 at last, finally enters atmosphere.In the present invention, original air-cooler 19 of mixing needn't move.The carbonated drink circulation process of Turbo-generator Set: the saturated vapor that heating furnace waste heat boiler 2 produces is sent into the superheater influent header of superheated steam boiler 13, and saturated vapor is sent into Turbo-generator Set 7 behind the Turbo-generator Set nominal parameter and generated electricity through overheated reaching.The condensate water that Turbo-generator Set 7 produces is sent into low-pressure heater 9 through condensate pump 8, the thermal source of low-pressure heater 9 is provided by the saturated vapor that heating furnace water beam vaporization cooling drum 17 produces, heated condensate water is sent into high-pressure heater 12 by feed pump 11 after entering higher-pressure deaerator 10 deoxygenations.High-pressure feed water sends into superheated steam boiler 13 respectively and heating furnace waste heat boiler 2 carries out the carbonated drink circulation.The hydrophobic of low-pressure heater 9 delivered to low pressure oxygen-eliminating device 16 by drainage pump 15 after flowing into lower water box 14, enter heating furnace water beam vaporization cooling recirculation system.The heating furnace water beam vaporization cooling institute saturated vapor that produces is no longer directly supplied plant area's pipe network, changes by the adjusting of Turbo-generator Set 7 supply of drawing gas.
The present invention can the flexible adaptation heating furnace various operating conditions, and do not influence original production status of heating furnace.Improve the operational factor of heating furnace waste heat boiler, improved residual heat generating efficiency.In sum, the present invention has good economic benefits, has good application and promotional value.
Claims (3)
1. a heating-furnace cogeneration system comprises heating furnace, heating furnace waste heat boiler, heating furnace air preheater, heating furnace heat pipe-type gas preheating device, heating furnace tail induced-draught fan, superheated steam boiler, Turbo-generator Set, chemical water system; It is characterized in that, arrange heating furnace waste heat boiler (2), heating furnace air preheater (3), heating furnace heat pipe-type gas preheating device (4), heating furnace tail induced-draught fan (5) successively along flue gas flow direction, reclaim waste heat of flue gas of heating furnace at heating furnace (1) afterbody; The heating furnace waste heat boiler generates electricity; Chemical water system heating furnace waste heat boiler and superheated steam boiler provide supplementing water.
2. system according to claim 1 is characterized in that, described chemical water system handles former water, reduces hardness of water and salt content.
3. a method that adopts the described system of claim 1 to carry out cogeneration is characterized in that, the technology of cogeneration comprises the carbonated drink circulation process of waste heat of flue gas of heating furnace recovery process and Turbo-generator Set;
The waste heat of flue gas of heating furnace recovery process: 1000 ℃-850 ℃ of heating furnace (1) preheating section exhaust gas temperatures, behind heating furnace waste heat boiler (2) recovery heat generation saturated vapor, exhaust gas temperature is 650 ℃-550 ℃; Behind flue gas process heating furnace air preheater (3) preheated air, exhaust gas temperature is 300 ℃-250 ℃; Behind flue gas process heating furnace gas preheating device (4) preheating gas, exhaust gas temperature is reduced to 150 ℃; Flue gas of heating furnace passes through heating furnace tail induced-draught fan (5) at last and enters heating furnace chimney (20), finally enters atmosphere;
The carbonated drink circulation process of Turbo-generator Set: the saturated vapor that heating furnace waste heat boiler (2) produces is sent into the superheater influent header of superheated steam boiler (13), and saturated vapor is sent into Turbo-generator Set (7) behind the Turbo-generator Set nominal parameter and generated electricity through overheated reaching; The condensate water that Turbo-generator Set (7) produces is sent into low-pressure heater (9) through condensate pump (8), the thermal source of low-pressure heater (9) is provided by the saturated vapor that heating furnace water beam vaporization cooling drum (17) produces, heated condensate water is sent into high-pressure heater (12) by feed pump (11) after entering higher-pressure deaerator (10) deoxygenation; High-pressure feed water is sent into superheated steam boiler (13) and heating furnace waste heat boiler (2) respectively carry out the carbonated drink circulation; The hydrophobic of low-pressure heater (9) delivered to low pressure oxygen-eliminating device (16) by drainage pump (15) after flowing into lower water box (14), enter heating furnace water beam vaporization cooling recirculation system; The adjusting of the heating furnace water beam vaporization cooling saturated vapor Turbo-generator Set of the producing supply of drawing gas.
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Cited By (11)
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| CN101968307A (en) * | 2010-11-04 | 2011-02-09 | 吴春平 | Thermal energy utilization system of reverberatory furnace |
| CN102121405A (en) * | 2011-02-28 | 2011-07-13 | 无锡三达环保科技有限公司 | Low-grade smoke organic rankine cycle waste heat generating system of heating furnace in steel rolling plate plant |
| CN102168590A (en) * | 2011-03-15 | 2011-08-31 | 中国电力工程顾问集团西南电力设计院 | Gas turbine generating system using flue gas waste heat organic hydrocarbon mixture |
| CN102345982A (en) * | 2011-01-10 | 2012-02-08 | 沈阳东大工业炉有限公司 | Heating furnace waste heat recovery generating device |
| CN103291390A (en) * | 2013-06-20 | 2013-09-11 | 华效资源有限公司 | Heating furnace flue gas and steam waste heat recycling and power generating system and power generating method |
| CN103471408A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | High-temperature flue gas waste-heat utilization system and method for heating furnace |
| CN103743251A (en) * | 2014-01-02 | 2014-04-23 | 莱芜钢铁集团有限公司 | Energy-saving environment-friendly compact short-process smelting and cast-rolling production system |
| CN105331379A (en) * | 2015-11-13 | 2016-02-17 | 北京神雾环境能源科技集团股份有限公司 | Power generation system and power generation method |
| CN106765036A (en) * | 2016-12-07 | 2017-05-31 | 北京京诚科林环保科技有限公司 | Condensate circulating heater |
| CN106979695A (en) * | 2017-04-07 | 2017-07-25 | 首钢总公司 | A kind of waste heat recovery system of heating furnace |
| CN114526612A (en) * | 2022-03-21 | 2022-05-24 | 江苏道和环保科技有限公司 | CSP heating furnace flue gas recirculation waste heat recovery system |
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| CN101509729B (en) * | 2009-01-15 | 2010-08-25 | 江苏东能环保能源科技有限公司 | Sintered power generation by waste heat system with by-product gas afterburning |
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| CN101968307A (en) * | 2010-11-04 | 2011-02-09 | 吴春平 | Thermal energy utilization system of reverberatory furnace |
| CN101968307B (en) * | 2010-11-04 | 2013-04-24 | 吴春平 | Thermal energy utilization system of reverberatory furnace |
| CN102345982A (en) * | 2011-01-10 | 2012-02-08 | 沈阳东大工业炉有限公司 | Heating furnace waste heat recovery generating device |
| CN102121405A (en) * | 2011-02-28 | 2011-07-13 | 无锡三达环保科技有限公司 | Low-grade smoke organic rankine cycle waste heat generating system of heating furnace in steel rolling plate plant |
| CN102168590A (en) * | 2011-03-15 | 2011-08-31 | 中国电力工程顾问集团西南电力设计院 | Gas turbine generating system using flue gas waste heat organic hydrocarbon mixture |
| CN103291390A (en) * | 2013-06-20 | 2013-09-11 | 华效资源有限公司 | Heating furnace flue gas and steam waste heat recycling and power generating system and power generating method |
| CN103471408A (en) * | 2013-09-06 | 2013-12-25 | 鞍钢股份有限公司 | High-temperature flue gas waste-heat utilization system and method for heating furnace |
| CN103471408B (en) * | 2013-09-06 | 2015-08-05 | 鞍钢股份有限公司 | A kind of heating furnace high-temperature smoke waste heat utilization system and method |
| CN103743251A (en) * | 2014-01-02 | 2014-04-23 | 莱芜钢铁集团有限公司 | Energy-saving environment-friendly compact short-process smelting and cast-rolling production system |
| CN103743251B (en) * | 2014-01-02 | 2016-05-18 | 莱芜钢铁集团有限公司 | The short flow process of a kind of energy-conserving and environment-protective compact is smelted casting production system |
| CN105331379A (en) * | 2015-11-13 | 2016-02-17 | 北京神雾环境能源科技集团股份有限公司 | Power generation system and power generation method |
| CN106765036A (en) * | 2016-12-07 | 2017-05-31 | 北京京诚科林环保科技有限公司 | Condensate circulating heater |
| CN106979695A (en) * | 2017-04-07 | 2017-07-25 | 首钢总公司 | A kind of waste heat recovery system of heating furnace |
| CN114526612A (en) * | 2022-03-21 | 2022-05-24 | 江苏道和环保科技有限公司 | CSP heating furnace flue gas recirculation waste heat recovery system |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |