CN102564147A - Combined recycling system for fume waste heat of furnace cover and flue of iron alloy electric furnace - Google Patents

Combined recycling system for fume waste heat of furnace cover and flue of iron alloy electric furnace Download PDF

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Publication number
CN102564147A
CN102564147A CN2012100482999A CN201210048299A CN102564147A CN 102564147 A CN102564147 A CN 102564147A CN 2012100482999 A CN2012100482999 A CN 2012100482999A CN 201210048299 A CN201210048299 A CN 201210048299A CN 102564147 A CN102564147 A CN 102564147A
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China
Prior art keywords
electric furnace
waste heat
heat boiler
flue
steam
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CN2012100482999A
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Chinese (zh)
Inventor
谢奕敏
宋纪元
屠正瑞
侯宾才
杨宏宜
方明
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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NANJING KAISHENG KAINENG ENVIRONMENTAL ENERGY SOURCES CO Ltd
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Priority to CN2012100482999A priority Critical patent/CN102564147A/en
Publication of CN102564147A publication Critical patent/CN102564147A/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 discloses a combined recycling system for fume waste heat of a furnace cover and a flue of an iron alloy electric furnace. The combined recycling system comprises the iron alloy electric furnace, a furnace cover waste heat boiler, the electric furnace flue, a flue waste heat boiler, a steam drum, a steam collecting tank, a steam turbine, a generator, a condenser, a deaerator and a water supply pump, and is characterized in that saturated steam generated by the furnace cover waste heat boiler of the iron alloy electric furnace is mixed with saturated steam generated by the electric furnace flue waste heat boiler, mixed steam then flows into the electric furnace flue waste heat boiler to be superheated, and generated superheated steam enters a turbine and generator unit to generate power. The furnace cover waste heat boiler of the iron alloy electric furnace and the electric furnace flue waste heat boiler are scientifically coupled, the electric furnace is cooled by the furnace cover waste heat boiler, heat of the electric furnace is sufficiently recycled, simultaneously, power consumption for circulation of water and circulation of the water pump and an original circulating water cooling field are greatly reduced, power generation capacity is greatly increased as compared with a conventional electric furnace waste heat utilizing mode including that only fume heat of a flue is recycled, and utilization efficiency of electric furnace waste heat is improved.

Description

The system of a kind of iron alloy electric furnace bell and flue gas residual heat combined recovery
Technical field
The present invention relates to afterheat generating system in a kind of ferroalloy smelting process, be specifically related to the system of a kind of iron alloy electric furnace bell and flue gas residual heat combined recovery.
Background technology
Ferroalloy is one of steel and iron industry and the requisite important source material of machine casting industry, its main application: the one, as deoxidier, eliminate excessive oxygen in the molten steel; The 2nd, as the alloying element additive, improve the quality and the performance of steel.The ferroalloy production method is a lot, is broadly divided into electric furnace process, blast furnace process, oxygen coverter method, vacuum solid reducing process and perrin process etc.Wherein 75% adopt the electric reduction furnace method.Ferroalloy need consume mass energy in process of production, its not only product be the high energy carrier, and the high-temperature flue gas that produces in the smelting process and equipment cooling have been taken away a large amount of heats.On the basis of ferroalloy production technology and technological relatively stable moulding, under the overall situation of global energy ten minutes shortage, increasing ferroalloy technical staff authors begin to invest sight on energy-saving and cost-reducing and these aspects of UTILIZATION OF VESIDUAL HEAT IN.
Realize that the earliest the producer of industrial semiclosed electric furnace UTILIZATION OF VESIDUAL HEAT IN is Sweden watt Gang Chang abroad, just invested to build the recovery fume afterheat engineering of 21000KVA, 45000KVA and three semiclosed furnaces of 75000KVA nineteen fifty-nine, 1966 and 1972 respectively.Ai Ken companies in 1977 are the 96000KVA electric furnace in area, French Dunkirk, though its investment is higher by 50% than common open-heater, but the steam-electric power that produces can reduce delivery 20%, thereby has reduced production cost, improves profit 5%.The 32000KVA that Japan heavy chemical industry company and goods Chuan Chang began to develop from 1979 has the semiclosed ferrosilicon stove of afterheat generating system.Norway is than Yue Erfosen company, the German De Make company UTILIZATION OF VESIDUAL HEAT IN problem that all about the seventies, begins one's study.
Because blockade on new techniques and domestic and international material composition are different, and the electric furnace model of operation is all less than normal before domestic.Cause domestic iron alloy electric furnace cogeneration to be started late, development is slow partially.China begins from the eighties, utilizes waste heat boiler to give flue gas cool-down successively, and adopts method ash disposal such as chromium ball method, shock wave method, blasting procedure, compressed air; The unit that implements the iron alloy electric furnace waste heat recovery the earliest is Guangxi Aug. 1st ferroalloy works, at the beginning of 2009 9 months, finish in the supporting 1# of 2 * 16.5MW stove, 2# boiler erection debugging, employing be the shock wave purge mode; Vertical single waste heat boiler of pressing; Operational effect is pretty good at the beginning, but after moving about 1 year, effect worse and worse.And then the thing logical cogeneration technology that adopts Shanghai can create research and development in Qinghai adopts the steel brush deashing, single horizontal type waste heat boiler of pressing, and operational effect is not bad at present, but stability is not high, and UTILIZATION OF VESIDUAL HEAT IN is limited.The Xibei Ferroalloy Works of rising is the domestic enterprise that introduces the large-scale electric furnace of German De Make the earliest; The ball blast deashing of its Hangzhou Boiler Factory that adopts research and development; Single mode of vertical waste heat boiler of pressing reclaims fume afterheat, and general effect is better, and stability is also higher; But also not strong for the big adaptability of flue gas fluctuation, and the waste heat that reclaims is also limited.
From the above, the iron alloy electric furnace UTILIZATION OF VESIDUAL HEAT IN that present China develops all only reclaims the electric furnace flue gas heat, and utilization rate is not high, and in the electric furnace smelting process, the furnace lid cooling water is directly drained, and has wasted great amount of heat.To above problem; In order more fully to reclaim the electric furnace waste heat, can join together furnace lid waste heat boiler and flue residue heat boiler to utilize, can reclaim the heat of electric furnace loss so largely; Reduce the heat that original recirculated cooling water is taken away; And significantly reduce the power consumption because of original a large amount of recirculated waters, it is overheated that the saturated vapor that the bell waste heat boiler produces can feed in the electric furnace flue residue heat boiler, produces superheated steam and generate electricity.
Summary of the invention
The object of the present invention is to provide the system of a kind of iron alloy electric furnace bell and flue gas residual heat combined recovery, can reduce the power consumption of quantity of circulating water and water circulating pump significantly, and can farthest reclaim the electric furnace heat.
The object of the invention can be realized through following technical scheme:
The system of a kind of iron alloy electric furnace bell and flue gas residual heat combined recovery; Comprise iron alloy electric furnace, furnace lid, electric furnace flue, flue residue heat boiler, drum, steam manifold, steam turbine, generator, condenser, oxygen-eliminating device and feed pump; Wherein, Furnace lid is the bell waste heat boiler, and the drum and the steam manifold of said bell waste heat boiler join, and the drum of said flue residue heat boiler also joins with said steam manifold; The steam that said steam manifold comes out gets into the flue residue heat boiler, and the superheated steam of generation leads to steam turbine; Said steam turbine, condenser, oxygen-eliminating device and feed pump join successively, and said feed pump joins with said bell waste heat boiler and flue residue heat boiler; Said steam turbine links to each other with generator.
The object of the invention can also further realize through following technical scheme:
Above-mentioned a kind of iron alloy electric furnace bell and electric furnace flue gas residual heat combined recovery system, its flue residue heat boiler can also can be two pressure vertical boilers for single vertical boiler of pressing.
Of the present invention having the following advantages: (1) replaces original furnace lid with the bell waste heat boiler, has fully reclaimed the heat of electric furnace; (2) reduced the power consumption of quantity of circulating water and water circulating pump; (3) reduce recirculated water cooling area, practiced thrift the place; (4) improved electric furnace UTILIZATION OF VESIDUAL HEAT IN efficient, generated energy increases.
Description of drawings
Fig. 1 is the schematic diagram during single pressing system for flue residue heat boiler among the present invention adopts.
Schematic diagram when Fig. 2 adopts dual pressure system for flue residue heat boiler among the present invention.
The specific embodiment
Embodiment 1
The principle of present embodiment is as shown in Figure 1; The system of a kind of iron alloy electric furnace bell heat and electric furnace flue gas residual heat combined recovery comprises electric furnace 1, furnace lid waste heat boiler 2, electric furnace flue 3, bell waste heat boiler drum 4, flue residue heat boiler 5, waste heat boiler drum 6, steam manifold 7, steam turbine 8, generator 9, condenser 10, oxygen-eliminating device 11, feed pump 12.
Its idiographic flow is set forth as follows:
The steam that comes out from furnace lid waste heat boiler drum 4 is with after the steam that waste heat boiler drum 6 comes out mixes steam manifold 7; Insert the superheater in the flue residue heat boiler 5 through jet chimney, the generation superheated steam advances main steam line and steam turbine 8 joins; The exhaust steam that superheated steam comes out after in steam turbine 8, doing work gets into condenser 10; After exhaust steam and recirculated water further cool off in condenser 10, lead to oxygen-eliminating device 11, after the oxygen-eliminating device deoxygenation; Join with boiler feed pump 12 again, lead to furnace lid waste heat boiler 2 and flue residue heat boiler 5 through feed pump 12.The demineralized water and the electric furnace flue gas heat exchange of coming out that lead to flue residue heat boiler 5 from electric furnace flue 3; Demineralized water in the bell waste heat boiler and the heat exchange of furnace high-temperature thermal source; The saturated vapor that produces mixes in steam manifold 7 with the steam of waste heat boiler drum 6, accomplishes whole circulation.
Embodiment 2
In the present embodiment, flue residue heat boiler 5 makes dual pressure system into, and is as shown in Figure 2, and low pressure stage superheated steam and steam turbine 8 join, and gets into steam turbine 8 actings as filling.All the other connected systems are the same with the foregoing description 1, no longer repeat at this.
In sum; The system of the present invention's a kind of iron alloy electric furnace bell heat and electric furnace flue gas residual heat combined recovery; Cool off electric furnace with the bell waste heat boiler, fully reclaimed the heat of electric furnace, reduced the power consumption of quantity of circulating water and water circulating pump simultaneously widely; And original recirculated water cooling place, save the area.The more important thing is and improved electric furnace UTILIZATION OF VESIDUAL HEAT IN efficient, improved electric furnace UTILIZATION OF VESIDUAL HEAT IN generated energy on largely.
The present invention can also have other embodiments, and the technical scheme that equal replacement of all employings or equivalence replacement form all drops within the scope of requirement protection of the present invention.

Claims (2)

1. the system of iron alloy electric furnace bell and flue gas residual heat combined recovery; Comprise iron alloy electric furnace (1), furnace lid, electric furnace flue (3), flue residue heat boiler (5), drum, steam manifold (7), steam turbine (8), generator (9), condenser (10), oxygen-eliminating device (11) and feed pump (12); It is characterized in that: furnace lid is bell waste heat boiler (2); The drum (4) of said bell waste heat boiler (2) joins with steam manifold (7), and the drum (6) of said flue residue heat boiler (5) also joins with said steam manifold (7); The steam that said steam manifold (7) comes out gets into flue residue heat boiler (5), and the superheated steam of generation leads to steam turbine (8); Said steam turbine (8), condenser (10), oxygen-eliminating device (11) and feed pump (12) join successively, and said feed pump (12) joins with said bell waste heat boiler (2) and flue residue heat boiler (5); Said steam turbine (8) links to each other with generator (9).
2. according to the system of said a kind of iron alloy electric furnace bell of claim 1 and flue gas residual heat combined recovery, it is characterized in that: said flue residue heat boiler is single vertical boiler or two pressure vertical boiler of pressing.
CN2012100482999A 2012-02-29 2012-02-29 Combined recycling system for fume waste heat of furnace cover and flue of iron alloy electric furnace Pending CN102564147A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103307892A (en) * 2013-06-04 2013-09-18 广州资源环保水电工程有限公司 High-temperature flue gas flow-guiding device
CN109959291A (en) * 2019-03-11 2019-07-02 江苏东九重工股份有限公司 Residual-heat utilization method and its system during calcium carbide factory's melting carbide condensation

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201050944Y (en) * 2007-05-30 2008-04-23 中冶京诚工程技术有限公司 Residual heat recycling device for electric furnace smoke gas
CN201071741Y (en) * 2007-09-07 2008-06-11 北京佰能电气技术有限公司 Electric furnace flue gas waste heat power generation system
CN101392992A (en) * 2008-10-27 2009-03-25 中信重工机械股份有限公司 Silicon smelting electric furnace waste heat power generation process flow and configuration
WO2010047004A1 (en) * 2008-10-21 2010-04-29 スチールプランテック株式会社 Waste heat recovery facility of arc furnace for steel-making and method for recovering waste heat
CN102192654A (en) * 2010-03-04 2011-09-21 杭州杭锅工业锅炉有限公司 Waste heat boiler cooling and waste heat utilizing system for furnace lid of submerged arc furnace
CN202470790U (en) * 2012-02-29 2012-10-03 南京凯盛开能环保能源有限公司 Union recycling system for fume afterheat in furnace lid and fume duct of ferroalloy electric furnace

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201050944Y (en) * 2007-05-30 2008-04-23 中冶京诚工程技术有限公司 Residual heat recycling device for electric furnace smoke gas
CN201071741Y (en) * 2007-09-07 2008-06-11 北京佰能电气技术有限公司 Electric furnace flue gas waste heat power generation system
WO2010047004A1 (en) * 2008-10-21 2010-04-29 スチールプランテック株式会社 Waste heat recovery facility of arc furnace for steel-making and method for recovering waste heat
CN101392992A (en) * 2008-10-27 2009-03-25 中信重工机械股份有限公司 Silicon smelting electric furnace waste heat power generation process flow and configuration
CN102192654A (en) * 2010-03-04 2011-09-21 杭州杭锅工业锅炉有限公司 Waste heat boiler cooling and waste heat utilizing system for furnace lid of submerged arc furnace
CN202470790U (en) * 2012-02-29 2012-10-03 南京凯盛开能环保能源有限公司 Union recycling system for fume afterheat in furnace lid and fume duct of ferroalloy electric furnace

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103307892A (en) * 2013-06-04 2013-09-18 广州资源环保水电工程有限公司 High-temperature flue gas flow-guiding device
CN103307892B (en) * 2013-06-04 2015-03-25 广州资源环保水电工程有限公司 High-temperature flue gas flow-guiding device
CN109959291A (en) * 2019-03-11 2019-07-02 江苏东九重工股份有限公司 Residual-heat utilization method and its system during calcium carbide factory's melting carbide condensation
CN109959291B (en) * 2019-03-11 2020-06-16 江苏东九重工股份有限公司 Waste heat utilization method and system in condensation process of molten calcium carbide in calcium carbide plant

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Application publication date: 20120711