CN102878822B - Device and method for purifying and recycling furnace gas of hermetic ore smelting furnace - Google Patents

Device and method for purifying and recycling furnace gas of hermetic ore smelting furnace Download PDF

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Publication number
CN102878822B
CN102878822B CN201210409492.0A CN201210409492A CN102878822B CN 102878822 B CN102878822 B CN 102878822B CN 201210409492 A CN201210409492 A CN 201210409492A CN 102878822 B CN102878822 B CN 102878822B
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China
Prior art keywords
furnace gas
gas
furnace
cooler
sack cleaner
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CN201210409492.0A
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Chinese (zh)
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CN102878822A (en
Inventor
王宇
杨柏松
潘家綮
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辽宁环宇环保科技股份有限公司
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Publication of CN102878822A publication Critical patent/CN102878822A/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 relates to a device and a method for purifying and recycling furnace gas of a hermetic ore smelting furnace. The technical scheme of the device for purifying and recycling furnace gas of the hermetic ore smelting furnace includes that the hermetic ore smelting furnace is connected with a cooler via a water-cooling flue, the cooler is connected with a waste furnace gas draught fan, an online gas detecting analyzer is mounted at an outlet of the waste furnace gas draught fan which is connected with bag-type dedusters via pipes, an explosion venting safety device is arranged on the bag-type dedusters, a gas outlet of the bag-type dedusters is connected with an inlet of a pure furnace gas pressurizing fan, the pure furnace gas pressurizing fan is connected with a three-way changeover valve, the online gas detecting analyzer is interlocked with the three-way changeover valve which is connected with a user pipe and a diffusing tower, and the lower ends of a mechanical air cooler and the pulse bag-type dedusters are respectively connected with dust removing devices. The device for purifying and recycling furnace gas of the hermetic ore smelting furnace is simple in systematic flow path and stable and reliable in running, dust content of furnace gas purified is less than 5mg/m<3>, dust recycled can be reutilized, and secondary pollution to water can be avoided.

Description

Closed submerged stove flue gas cleaning recycle device and method
Technical field
The invention relates to flue gas cleaning and recycles field, relates to the apparatus and method of the flue gas cleaning recycling produced when smelting closed submerged stove particularly.
Background technology
Closed submerged stove is mainly used in reducing and smelting ore.With various sintering deposit for raw material, sintering deposit is fused into ferrosilicon by Electrode, ferromanganese, ferrochrome, ferrotungsten, the ferroalloys such as nickel, titanium, silicomanganese.The furnace gas that closed submerged stove produces when smelting is coal gas of high temperature, containing a large amount of dust, directly cannot use, could use after must carrying out dedusting.Current closed submerged stove flue gas cleaning adopts water washing+dry electric precipitation mode to carry out dedusting mostly, namely water washing produces waste water, waste residue, cause the secondary pollution of water, need process sewage, water consumption is serious, and the dust collected loses recycle value, the dust content of gas after purification is at 50mg/Nm 3above, invest high, take up an area large.
Summary of the invention
In order to overcome the above problems, the object of the invention is to provide a kind of system flow simply, stable and reliable operation, dust content < 5mg/m after gas purification 3, the dust of recovery can utilize by secondary, can the closed submerged stove flue gas cleaning recycle device of secondary pollution of anti-sealing.
Another object of the invention is to provide a kind of Recovery Purifying and utilizes the method for closed submerged stove furnace gas and improve calorific value of gas.
The technical scheme that the invention adopts is: a kind of closed submerged stove flue gas cleaning recycle device, comprise closed submerged stove, closed submerged stove is connected with cooler by water-cooled flue, cooler is connected with waste furnace gas air-introduced machine, online gas detection analyzer is arranged on the exit of waste furnace gas air-introduced machine, waste furnace gas air-introduced machine is connected with some sack cleaners by pipeline, sack cleaner is provided with venting of dust explosion safety device, sack cleaner gas outlet is connected with the entrance of clean furnace gas booster fan, clean furnace gas booster fan is connected with three-way switch valve through pipeline, online gas detection analyzer is connected with three-way switch valve, three-way switch valve connects user pipe and diffusing tower respectively, cooler is connected ash-discharging device respectively with the lower end of sack cleaner.
Above-mentioned closed submerged stove flue gas cleaning recycle device, installs a sleeving valve group respectively at the outlet of cooler and the air inlet of sack cleaner and gas outlet place.Described valve group is made up of compensator, blank-plate valve and butterfly valve.
Above-mentioned device Recovery Purifying is utilized to utilize the method for closed submerged stove furnace gas as follows: the furnace gas produced in smelting process by closed submerged stove is discharged by mineral hot furnace furnace roof, enter water-cooled flue, cooler is entered after water-cooled flue is cooled to about 450 DEG C, after cooler heat exchange, furnace gas temperature is down to about 200-250 DEG C, sack cleaner is delivered to by waste furnace gas air-introduced machine, waste furnace gas air-introduced machine adopts frequency control, according to the revolution of the waste furnace gas air-introduced machine of the pressure adjusting in closed submerged stove, ensure that pressure in closed submerged stove is at 10 ~ 20Pa, furnace gas flows through three-way switch valve through sack cleaner and clean furnace gas booster fan, online gas detection analyzer and three-way switch valve chain, online gas detection analyzer is for detecting the CO in furnace gas 2, CO, H 2, O 2concentration, according to testing result, or open diffusing tower, furnace gas diffuses by direct-fire, maybe the furnace gas of purification is transferred to user pipe, as furnace gas is blasted at pipeline or deduster inside, the venting of dust explosion safety device on deduster is utilized to unload quick-fried, by the dust collected by cooler and sack cleaner, got rid of by ash-discharging device.
Above-mentioned method, online gas detection analyzer detects the CO in furnace gas 2, CO, H 2, O 2concentration, when detected CO concentration>=30%, the furnace gas purified sends into user pipe through three-way switch valve, and as concentration <30%, open diffusing tower, direct-fire is diffused sky; When H being detected 2during concentration>=4%, need maintenance down water-cooled flue; When O being detected 2during concentration>=2%, open diffusion valve, diffuse sky, blasting as flue gas cleaning system utilizes the venting of dust explosion safety device on deduster to unload quick-fried, protects system equipment.
the beneficial effect of the invention is:
1. the invention, adopts sack cleaner dedusting, is full-dry method bag-type dusting mode, completely eliminates the consumption of water in wet cleaning process, prevent the secondary pollution of dust and water.
2. the invention, the dust collected by cooler and sack cleaner is dry powder, directly can get back to secondary in mineral hot furnace and utilize.
3. the invention, system flow is simple, stable and reliable operation, takes up an area few, invests little.Front end adopts cooler, ensures that the outlet temperature of flue gas controls to enter sack cleaner at about 200-250 DEG C, prevents low-temperature flue gas from entering deduster and occur dew condensation phenomenon, thus ensures that system cloud gray model is more stable, and the life-span increases.
4. the invention, the efficiency utilization energy, can carry out secondary utilization to water-cooled flue heat exchange hot water out, achieve the policy of recycling economy and sustainable development.
5. the invention, can utilize the heat energy of flue gas to carry out preheating to source of the gas, and the phenomenon preventing pulse dust cleaning from bringing deashing to condense because gas source temperature is too low occurs.
6. the invention, adopts online gas detection analyzer, in time to the CO in furnace gas 2, CO, H 2, O 2concentration detects.When H being detected 2during concentration>=4%, illustrate that water-cooled flue has leak source, can overhaul water-cooled flue.When coal gas oxygen content exceeds standard, can blast at pipeline or deduster inside, therefore by detecting O 2concentration, when O being detected 2during concentration>=2%, namely utilize bleeding device to diffuse sky, blasting as flue gas cleaning system utilizes the venting of dust explosion safety device on deduster to unload quick-fried, protects system equipment.
7. the invention, adopt sack cleaner dedusting, purification efficiency is high, and deashing ability is strong.Dust content of gas < 5mg/m after purification 3, extend the service life of user's burner.
8. the invention, at the outlet of cooler and the air inlet of sack cleaner and gas outlet place, a set of valve group be made up of compensator, blank-plate valve and butterfly valve is installed respectively, when repair apparatus, thoroughly can completely cut off air, not blast when guarantee equipment normally runs.
Accompanying drawing explanation
Fig. 1 is the structural representation of the invention.
Fig. 2 is A portion structure for amplifying schematic diagram in Fig. 1.
Detailed description of the invention
As shown in Figure 1, a kind of closed submerged stove flue gas cleaning recycle device, comprise closed submerged stove (1), closed submerged stove (1) is connected with cooler (3) by water-cooled flue (2), and cooler (3) is connected with waste furnace gas air-introduced machine (4), CO 2, CO, H 2, O 2the online gas detection analyzer of concentration (5) is arranged on the exit of waste furnace gas air-introduced machine (4), waste furnace gas air-introduced machine (4) is connected with some sack cleaners (6) by pipeline, sack cleaner (6) is provided with venting of dust explosion safety device (7), sack cleaner (6) gas outlet is connected with the entrance of clean furnace gas booster fan (9), clean furnace gas booster fan (9) is connected with three-way switch valve (11) through pipeline, online gas detection analyzer (5) is chain with three-way switch valve (11), three-way switch valve (11) connects user pipe (12) and diffusing tower (10) respectively, cooler (3) is connected ash-discharging device (8) respectively with the lower end of sack cleaner (6).
Above-mentioned closed submerged stove flue gas cleaning recycle device, installs a set of valve group (13) be made up of compensator (13-1), blank-plate valve (13-2) and butterfly valve (13-3) respectively at the outlet of cooler and the air inlet of sack cleaner and gas outlet place.
Above-mentioned device Recovery Purifying is utilized to utilize the method for closed submerged stove furnace gas as follows: to be discharged by mineral hot furnace furnace roof by the furnace gas that closed submerged stove (1) produces in smelting process, enter water-cooled flue (2), cooler (3) is entered after water-cooled flue is cooled to about 450 DEG C, after cooler heat exchange, furnace gas temperature is down to about 200-250 DEG C, sack cleaner (6) is delivered to by waste furnace gas air-introduced machine (4), waste furnace gas air-introduced machine adopts frequency control, according to the revolution of the waste furnace gas air-introduced machine of the pressure adjusting in closed submerged stove, ensure that pressure in closed submerged stove is at 10 ~ 20Pa, the exit of waste furnace gas air-introduced machine is provided with detects CO 2, CO, H 2, O 2the online gas detection analyzer (5) of concentration, furnace gas flows through three-way switch valve (11) through sack cleaner and clean furnace gas booster fan (9), online gas detection analyzer and three-way switch valve chain, online gas detection analyzer is for detecting the CO in furnace gas 2, CO, H 2, O 2concentration, according to testing result, or open diffusing tower (10), furnace gas diffuses by direct-fire, maybe the furnace gas of purification is transferred to user pipe (12): when detected CO concentration>=30%, the furnace gas purified sends into user pipe through three-way switch valve, as concentration <30%, open diffusing tower, direct-fire is diffused sky, when H being detected 2during concentration>=4%, illustrate that water cooled pipeline has leak source, need maintenance down water cooled pipeline, sack cleaner is installed venting of dust explosion safety device, when coal gas oxygen content exceeds standard (O 2concentration>=2%), when pipeline or deduster inside are blasted, utilize venting of dust explosion safety device to unload quick-fried, system equipment is protected.Dust collected by the ash-discharging device (8) being located at cooler and sack cleaner lower end is dry powder, directly can get back to secondary in mineral hot furnace and utilize.
When repair apparatus, compensator, blank-plate valve and butterfly valve are closed successively, isolated air, ensures the normal operation of equipment.

Claims (1)

1. a closed submerged stove flue gas cleaning recoverying and utilizing method, it is characterized in that method is as follows: adopt closed submerged stove flue gas cleaning recycle device, the furnace gas produced in smelting process by closed submerged stove is discharged by mineral hot furnace furnace roof, enter water-cooled flue, cooler is entered after water-cooled flue is cooled to about 450 DEG C, after cooler heat exchange, furnace gas temperature is down to about 200-250 DEG C, sack cleaner is delivered to by waste furnace gas air-introduced machine, waste furnace gas air-introduced machine adopts frequency control, according to the revolution of the waste furnace gas air-introduced machine of the pressure adjusting in closed submerged stove, ensure that pressure in closed submerged stove is at 10 ~ 20Pa, furnace gas flows through three-way switch valve through sack cleaner and clean furnace gas booster fan, online gas detection analyzer and three-way switch valve chain, online gas detection analyzer is for detecting the CO in furnace gas 2, CO, H 2, O 2concentration, when detected CO concentration>=30%, the furnace gas purified sends into user pipe through three-way switch valve, and as concentration <30%, open diffusing tower, direct-fire is diffused sky, when H being detected 2during concentration>=4%, need maintenance down water-cooled flue, when O being detected 2during concentration>=2%, open diffusion valve, sky is diffused, as furnace gas is blasted at pipeline or deduster inside, the venting of dust explosion safety device on deduster is utilized to unload quick-fried, by the dust collected by cooler and sack cleaner, got rid of by ash-discharging device,
Described closed submerged stove flue gas cleaning recycle device is: comprise closed submerged stove (1), closed submerged stove (1) is connected with cooler (3) by water-cooled flue (2), cooler (3) is connected with waste furnace gas air-introduced machine (4), online gas detection analyzer (5) is arranged on the exit of waste furnace gas air-introduced machine (4), waste furnace gas air-introduced machine (4) is connected with some sack cleaners (6) by pipeline, sack cleaner (6) is provided with venting of dust explosion safety device (7), sack cleaner (6) gas outlet is connected with the entrance of clean furnace gas booster fan (9), clean furnace gas booster fan (9) is connected with three-way switch valve (11) through pipeline, online gas detection analyzer (5) is connected with three-way switch valve (11), three-way switch valve (11) connects user pipe (12) and diffusing tower (10) respectively, cooler (3) is connected ash-discharging device (8) respectively with the lower end of sack cleaner (6), at the outlet of cooler (3) and the air inlet of sack cleaner (6) and gas outlet place, one sleeving valve group (13) is installed respectively, described valve group (13) is made up of compensator (13-1), blank-plate valve (13-2) and butterfly valve (13-3).
CN201210409492.0A 2012-10-24 2012-10-24 Device and method for purifying and recycling furnace gas of hermetic ore smelting furnace CN102878822B (en)

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CN104048555B (en) * 2013-03-13 2016-03-30 苏州卓融新能源科技有限公司 A kind of electromagnetic pulse cleaning type heat-exchange energy-saving machine
CN103234344B (en) * 2013-04-28 2014-11-12 成都高威节能科技有限公司 Water leakage detection and treatment method for closed submerged arc furnace
CN103305653A (en) * 2013-06-19 2013-09-18 交城义望铁合金有限责任公司 System for recycling raw coke oven gas of manganous slag-rich electric furnace and process for recycling raw coke oven gas
CN107987892A (en) * 2017-11-24 2018-05-04 重庆大朗冶金新材料有限公司 Mineral hot furnace coal-gas recovering Application way and equipment

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JPH11237191A (en) * 1998-02-19 1999-08-31 Daido Steel Co Ltd Device for treating exhaust gas from furnace-top preheating device
CN2529038Y (en) * 2002-02-04 2003-01-01 余德平 Two-way gas stop valve set
CN101691624A (en) * 2009-09-21 2010-04-07 无锡市东方环境工程设计研究所有限公司 Purifying and recovering process of absolute dry bag-type converter gas negative energy
CN102021264A (en) * 2010-12-03 2011-04-20 宁波大学 Dust-removal and waste heat recovery system of steelmaking converter gas and recovery method of dust-removal and waste heat recovery system
CN102183155A (en) * 2011-03-25 2011-09-14 宝钢工程技术集团有限公司 Smoke high-temperature dust removal and steam and coal gas recovery system and method for calcium carbide furnace
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