CN102778134A - New process for utilizing waste heat of flue gas of semi-enclosed ore-smelting electric furnace - Google Patents

New process for utilizing waste heat of flue gas of semi-enclosed ore-smelting electric furnace Download PDF

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Publication number
CN102778134A
CN102778134A CN2012102070438A CN201210207043A CN102778134A CN 102778134 A CN102778134 A CN 102778134A CN 2012102070438 A CN2012102070438 A CN 2012102070438A CN 201210207043 A CN201210207043 A CN 201210207043A CN 102778134 A CN102778134 A CN 102778134A
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CN
China
Prior art keywords
electric furnace
ore
flue gas
air
smelting electric
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Pending
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CN2012102070438A
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Chinese (zh)
Inventor
许善文
韩克余
袁志勇
刘远德
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ZUNYI GUIKE TECHNOLOGY Co Ltd
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ZUNYI GUIKE TECHNOLOGY Co Ltd
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Priority to CN2012102070438A priority Critical patent/CN102778134A/en
Publication of CN102778134A publication Critical patent/CN102778134A/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 new process for utilizing the waste heat of flue gas of a semi-enclosed ore-smelting electric furnace. The new process comprises the following steps: (1) the flue gas of the ore-smelting electric furnace is input into a heat storage type heat exchanger, and simultaneously cold air is conveyed into the heat storage type heat exchanger by using an air blower; (2) the flue gas of the electric furnace is replaced with the cold air input simultaneously in the heat storage type heat exchanger, the generated high-temperature air more than 500 DEG C is input into a waste-heat boiler by a pipeline to produce high-temperature steam, the high-temperature steam is then distributed to a steam turbine generating set for generating power, and a part of high-temperature air about 200 DEG C exhausted by the waste-heat boiler is distributed into a material drying kiln for baking materials and into a gas-seal furnace door so as to be used as combustion-supporting air of the ore-smelting electric furnace; and (3) the flue gas about 150 DEG C generated by the heat storage type heat exchanger is conveyed into a pulse bag type dust remover for purification treatment, and then is conveyed to a wind generating set for generating power by an induced draft fan. The new process disclosed by the invention has the advantages that the waste heat of the flue gas of the ore-smelting electric furnace is effectively utilized, the energy-saving and environment-friendly effects are achieved, the investment is reduced and the benefit is improved.

Description

Semiclosed ore-smelting electric furnace fume afterheat utilizes new technology
Technical field
The present invention relates to a kind of semiclosed ore-smelting electric furnace fume afterheat and utilize new technology, can be widely used in ore-smelting electric furnace discharged flue gas such as ferroalloy, calcium carbide industry are purified and the fume afterheat utilization.Belong to the energy-conserving and environment-protective technical field.
 
Background technology
There is a large amount of industrial furnaces in China in industries such as metallurgy, chemical industry, building materials, electric power, dumps a large amount of fume afterheats during production, and these waste heats take more than 40% of total amount of ability, not only waste as not reclaiming, and cause ecological deterioration.Also need adopt aerial cooler, mechanical cooler prolong smoke smoke discharging pipe in order to reduce flue-gas temperature in the process of udst separation simultaneously; In order to reduce the diffusing discharging of fire door; Adopt the hermetic seal fire door, these measures not only make fume afterheat not be effectively used and are wasted, but also have increased SR; Fan energy consumption has strengthened equipment investment and operating cost.
 
Summary of the invention:
The objective of the invention is provides a kind of industrial furnace residual heat of exhaust flue gas to utilize new technology to the problems referred to above, and especially a kind of semiclosed ore-smelting electric furnace fume afterheat utilizes new technology, and this process program is following:
Said semiclosed ore-smelting electric furnace fume afterheat utilizes new technology, is with the high-temperature flue gas that dumps from ore-smelting electric furnace, and through the accumulation of heat displacement, the input waste heat boiler is produced steam and generated electricity, and carries out udst separation simultaneously, and concrete processing step is:
1. with ore-smelting electric furnace flue gas input heat regenerator, with air blast cold air is sent into heat regenerator simultaneously;
2. electric furnace flue gas is replaced with the cold air of input simultaneously in heat regenerator; The high temperature air more than 500 ℃ that produces is produced high-temperature steam through pipeline input waste heat boiler; High-temperature steam is distributed to the generating of turbo-generator group again, and the high temperature air that the part that waste heat boiler is discharged is about 200 ℃ is distributed into the roasting material of drying materials kilning, the sealing gland fire door is made the ore-smelting electric furnace combustion air;
3. 150 ℃ of flue gases on the right side producing of heat regenerator are sent into pulse bag type dust collector and are carried out purified treatment, and then deliver to the wind power generating set generating through air-introduced machine.
The electric power that said Turbo-generator Set and wind power generating set the produce output of being incorporated into the power networks.
 
Adopt the characteristics of above-mentioned process program to be:
1. adopted heat regenerator, this heat exchanger is a kind of constant temperature, constant voltage, continuous wind air heat exchanger, and temperature efficiency not only can be brought up to air themperature more than 500 ℃ up to 85%, is used for waste heat boiler production steam-electric power.And can flue-gas temperature be reduced to below 150 ℃, make the sack cleaner of udst separation flue gas can adopt the rate of filtration high, the terylene filter bag of long service life;
2. the high temperature air that gets into waste heat boiler is a clean air, and waste heat boiler is not established cleaning systems, and heat transfer efficiency is high, and is stable.
3. the high temperature that comes out from waste heat boiler (more than 200 ℃) air blasts in the electric furnace from the hermetic seal fire door as combustion air, can save and smelt power consumption 10%, and the diffusing discharging that has solved charge door has simultaneously improved operating environment.
4. utilize air cogeneration and the air-introduced machine outlet clean air wind-power electricity generation of high temperature (more than 500 ℃), can produce and be equivalent to 20% of melting electric consumption.
5. ferroalloy, calcium carbide production cost of products reduce more than 15%, are recoverable to equipment investment in 1 year.
Description of drawings:
Fig. 1 is the process chart that semiclosed ore-smelting electric furnace fume afterheat according to the invention utilizes new technology.
The specific embodiment
As shown in Figure 1; Semiclosed ore-smelting electric furnace fume afterheat according to the invention utilizes new technology; Be the high-temperature flue gas that will dump from ore-smelting electric furnace, through the accumulation of heat displacement, input waste heat boiler production steam-electric power; Concrete technical process is: 1. electric furnace flue gas is imported heat regenerator, with air blast cold air is sent into heat regenerator simultaneously; 2. the high temperature air input waste heat boiler more than 500 ℃ that produces in the heat regenerator is distributed to the generating of turbo-generator group again, and material is baked in the drying materials kilning, and the sealing gland fire door is made combustion air; 3. the flue gas of heat regenerator is sent into pulse bag type dust collector and is carried out purified treatment, generates electricity through air-introduced machine to wind power generating set again.The electric power that said Turbo-generator Set and wind power generating set the produce output of being incorporated into the power networks.200 ℃ of hot-airs are returned to and make combustion air in the electric furnace in the said sealing gland fire door.
Utilized heat regenerator in the technology of the present invention, made after the high-temperature flue gas process smoke discharging pipe entering regenerator of ore-smelting electric furnace discharge, flue-gas temperature is reduced to below 150 ℃, satisfies the requirement of sack cleaner to flue-gas temperature.Air is heated by high-temperature flue gas through the Heat Room that air blast gets into heat regenerator simultaneously, produces steam near getting into waste heat boiler after the flue-gas temperature.
The regenerator of said heat regenerator is two, through being connected of four butterfly valves, two triple valves and system pipeline, realizes the accumulation of heat and the heat release of heat regenerator.Its replacement process is: when high-temperature flue gas passed through the heat storage of regenerator, the heat of flue gas is passed to heat storage raise its temperature, carries out accumulation of heat, cuts off flue gas subsequently; Feed cold air, heat storage is passed to cold air with heat, and regenerator temperature reduces, and carries out heat release; Cold air is heated output, and then cuts off cold air, passes to flue gas; Carry out so repeatedly, flue gas heat is passed to cold air through the intermediate medium heat storage, from face output high temperature air.For air is heated continuously, so regenerator is set to two, one is communicated with the flue gas accumulation of heat, and another is communicated with the air heat release.

Claims (2)

1. a semiclosed ore-smelting electric furnace fume afterheat utilizes new technology, it is characterized in that: this technology is with the high-temperature flue gas that dumps from ore-smelting electric furnace, through the accumulation of heat displacement, and input waste heat boiler production steam-electric power, and carry out gas cleaning simultaneously, concrete technical process is:
1. with ore-smelting electric furnace flue gas input heat regenerator, with air blast cold air is sent into heat regenerator simultaneously;
2. electric furnace flue gas is replaced with the cold air of input simultaneously in heat regenerator; The high temperature air more than 500 ℃ that produces is produced high-temperature steam through pipeline input waste heat boiler; High-temperature steam is distributed to the generating of turbo-generator group again, and the high temperature air that the part that waste heat boiler is discharged is about 200 ℃ is distributed into the roasting material of drying materials kilning, the sealing gland fire door is made the ore-smelting electric furnace combustion air;
3. 150 ℃ of flue gases on the right side producing of heat regenerator are sent into pulse bag type dust collector and are carried out purified treatment, and then deliver to the wind power generating set generating through air-introduced machine.
2. semiclosed according to claim 1 ore-smelting electric furnace fume afterheat utilizes new technology, it is characterized in that: the electric power that said Turbo-generator Set and wind power generating set the produce output of being incorporated into the power networks.
CN2012102070438A 2012-06-21 2012-06-21 New process for utilizing waste heat of flue gas of semi-enclosed ore-smelting electric furnace Pending CN102778134A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822495A (en) * 2012-11-16 2014-05-28 路忠胜 Energy-saving emission-reducing yield-increasing method for DC-resistor electric heating equipment
CN104295452A (en) * 2014-10-28 2015-01-21 宁夏天纵泓光余热发电技术有限公司 Waste heat power generating system capable of recycling vapor
CN104315870A (en) * 2014-10-27 2015-01-28 宁夏天纵泓光余热发电技术有限公司 Energy-saving power generating and heating system using submerged arc furnace waste heat
CN104481616A (en) * 2014-10-28 2015-04-01 宁夏天纵泓光余热发电技术有限公司 Flue gas waste heat power generation system with airflow accelerator
CN109520318A (en) * 2018-12-06 2019-03-26 中国科学院工程热物理研究所 A kind of heat-accumulating type high-temperature smoke waste heat utilization system

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Publication number Priority date Publication date Assignee Title
JPS5644710A (en) * 1979-09-18 1981-04-24 Sumitomo Metal Ind Ltd Waste heat recovery method of converter gas
CN1814547A (en) * 2006-03-06 2006-08-09 云南阳光基业能源科技有限公司 Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizing system
CN1991249A (en) * 2005-12-27 2007-07-04 遵义市华力环境工程有限责任公司 Electric furnace smelting heat recovery and utilization method
CN101100607A (en) * 2006-07-05 2008-01-09 中国科学院工程热物理研究所 Coking technique using coal external burning to replace gas fuel burning
US20100101760A1 (en) * 2007-03-22 2010-04-29 Geir Wedde Flue gas cooling and cleaning system
CN202254884U (en) * 2011-09-23 2012-05-30 路忠胜 Waste heat generating device of electric forge

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5644710A (en) * 1979-09-18 1981-04-24 Sumitomo Metal Ind Ltd Waste heat recovery method of converter gas
CN1991249A (en) * 2005-12-27 2007-07-04 遵义市华力环境工程有限责任公司 Electric furnace smelting heat recovery and utilization method
CN1814547A (en) * 2006-03-06 2006-08-09 云南阳光基业能源科技有限公司 Electric furnace method yellow phosphorus tail gas residual heat comprehensive balance utilizing system
CN101100607A (en) * 2006-07-05 2008-01-09 中国科学院工程热物理研究所 Coking technique using coal external burning to replace gas fuel burning
US20100101760A1 (en) * 2007-03-22 2010-04-29 Geir Wedde Flue gas cooling and cleaning system
CN202254884U (en) * 2011-09-23 2012-05-30 路忠胜 Waste heat generating device of electric forge

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103822495A (en) * 2012-11-16 2014-05-28 路忠胜 Energy-saving emission-reducing yield-increasing method for DC-resistor electric heating equipment
CN104315870A (en) * 2014-10-27 2015-01-28 宁夏天纵泓光余热发电技术有限公司 Energy-saving power generating and heating system using submerged arc furnace waste heat
CN104315870B (en) * 2014-10-27 2016-06-29 宁夏天纵泓光余热发电技术有限公司 Mineral hot furnace afterheat energy-saving power generation heating system
CN104295452A (en) * 2014-10-28 2015-01-21 宁夏天纵泓光余热发电技术有限公司 Waste heat power generating system capable of recycling vapor
CN104481616A (en) * 2014-10-28 2015-04-01 宁夏天纵泓光余热发电技术有限公司 Flue gas waste heat power generation system with airflow accelerator
CN109520318A (en) * 2018-12-06 2019-03-26 中国科学院工程热物理研究所 A kind of heat-accumulating type high-temperature smoke waste heat utilization system
CN109520318B (en) * 2018-12-06 2023-09-12 中国科学院工程热物理研究所 Heat accumulating type high-temperature flue gas waste heat utilization system

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Application publication date: 20121114