CN101942538A - Process and equipment for dust collection and heat recovery by converter gas dry method - Google Patents
Process and equipment for dust collection and heat recovery by converter gas dry method Download PDFInfo
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- CN101942538A CN101942538A CN2010102078407A CN201010207840A CN101942538A CN 101942538 A CN101942538 A CN 101942538A CN 2010102078407 A CN2010102078407 A CN 2010102078407A CN 201010207840 A CN201010207840 A CN 201010207840A CN 101942538 A CN101942538 A CN 101942538A
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Abstract
The invention provides an optimized process scheme and equipment aiming at the problems existing in the recovery technology of the conventional converter gas dry method. In the process scheme and the equipment, physical sensible heat between 800-1,000 DEG C and 200 DEG C of converter gas is recovered by using a high-efficient heat pipe exhaust-heat boiler, and hidden danger of system explosion is eliminated by using a spark arrestor at the same time. A nitrogen pulse bag-type dust collector replaces an electrostatic dust collector, so that the equipment has the advantages of simple structure, low fault rate and high dust collection efficiency. Compared with the recovery technology of the conventional converter gas dry method, the process scheme and equipment have obvious improvements on benefits, which are shown as reduction in dust emission load, reduction in energy and water consumption, increase in steam recovery, small equipment investment, safe and reliable process and the like.
Description
Technical field
The present invention relates to converter gas dry method dedusting and heat recuperation field, particularly relate to the technology and the equipment of absolutely dry method purification of a kind of coal gas of converter and heat recuperation.
Background technology
At present in field of iron and steel smelting, the recovery of coal gas of converter mainly is divided into dry method recovery technology (LT method, two kinds of Lu Qi-Di Senfa) and hydrometallurgic recovery technology (OG method).Reclaim with respect to the OG method, the LT method has remarkable advantages, and it shows as: the one, and udst separation efficient height can be reduced to 10mg/Nm with dust concentration by electric precipitator
3The 2nd, this system adopts dry method dust to handle, and water loss is less; The 3rd, the systemic resistance loss is little, coal gas calorific value height, and the dust of recovery can directly utilize.But along with dry technique applying at home and abroad, many problems have also been exposed, as the automation system complexity, strict being difficult to of the injection flow rate of evaporative cooler controlled, and the wall scale formation often appears, frequent and the complex structure failure rate height of electric precipitator venting of dust explosion, the ratio resistance of dust granules are regulated often and are unfavorablely made that the electrostatic precipitation effect is undesirable, and the dust concentration of outlet often is higher than 10mg/Nm
3
In addition, after the overflash cooling stack, temperature drops to 800～1000 ℃ from about 1450 ℃ to coal gas of converter from the converter outlet, and after this LT method is reduced to it below 200 ℃ by Water-and mist-spraying mode in the evaporative cooler again.Obvious physics sensible heat below 800～1000 ℃ does not only obtain reclaiming, but also has wasted big water gaging.Iron and steel enterprise is the power consumption water consumption rich and influential family of country, and recovery waste heat and minimizing water consumption have significance to the energy-saving and emission-reduction policy that country advocated undoubtedly as much as possible.
Summary of the invention
Goal of the invention: the problem that the present invention is directed to the LT method existence of the domestic digestion of external introduction proposes to improve one's methods, mainly solve described two key issues of background technology, one is that physics sensible heat below 800～1000 ℃ does not obtain utilizing, and has wasted a large amount of service waters; The 2nd, the electrostatic precipitator failure rate is high and can not reach the dust removing effects of expection.Simultaneously, the present invention has also considered the gas explosion problem that how to prevent in the absolutely dry method removal process that the production of converter steelmaking intermittence from being caused.
Invention scheme: for achieving the above object, the invention provides the equipment and technology scheme of absolutely dry method purification of a kind of coal gas of converter and heat recuperation, whole plant comprises converter, gasification cooling flue, spark catcher, waste heat boiler, pulse of nitrogen coal gas bag-type dust remover, switches cup valve, gas cooler, a gas chamber, diffuses chimney and thickness ash delivery system.
Coal gas of converter has the high temperature about 1450 ℃ near the converter outlet, be cooled to 800～1000 ℃ through behind the gasification cooling flue.After this enter spark catcher, its effect is to remove the big dust particle that has Mars that deenergizes and set off an explosion, and preventing to occur blast in the follow-up UTILIZATION OF VESIDUAL HEAT IN technological process may.The coal gas of converter of removing big particle enters waste heat boiler and is cooled to below 200 ℃, has reclaimed 800～1000 ℃ to 200 ℃ physics sensible heat around here, can produce a large amount of steam for the generating or its usefulness, and in this process without any need for service water.Coal gas of converter after the cooling enters the pulse of nitrogen coal gas bag-type dust remover and makes smart dust removal process, sack cleaner stable adaptability simple in structure is strong, and not limited by dust than resistance value, adopt the anti-electrostatic filtrate not have electrical spark to produce, be difficult for blast, thereby also just do not have the described blast shortcoming of electric precipitation.Its efficiency of dust collection height, the outlet dust concentration can be controlled in 10mg/Nm
3Below, far below discharging standards.Be provided with centrifugal gas blower after the pulse of nitrogen coal gas bag-type dust remover, in order to system dynamic to be provided.In the subsequent technique at sack cleaner and gas cooler, gas chamber and diffuse and be provided with shifter between the chimney, CO and O in coal gas
2Content when meeting the recovery standard, recovery cup valve is opened, coal gas of converter is cooled to by gas cooler and enters gas chamber below 70 ℃ again and store; CO and O in coal gas
2Content when not meeting the recovery standard, diffuse a glass valve and open, coal gas of converter enters and diffuses chimney and lighted and diffuse.
Further, described sparker is high temperature (water-cooled or vaporization cooling) double cyclone.
Further, described waste heat boiler is the high-efficiency heat pipe waste heat boiler, and its underpart outlet has elbow, has the separating particles effect.
Further, described sparker and waste heat boiler bottom are provided with the cinder delivery system, comprise cinder e Foerderanlage and cinder ash-storing bin.
Further, described sack cleaner is the pulse of nitrogen coal gas bag-type dust remover.
Further, described coal gas bag-type dust remover bottom is provided with thin grey delivery system, comprises thin grey e Foerderanlage and thin grey ash-storing bin.
Further, described cinder and thin grey e Foerderanlage are that zip mode is carried or pneumatic transport.
Further, described centrifugal gas blower is by Frequency Converter Control, and outlet is provided with sound damper.
Further, described coal-gas recovering adopts the hydrostatic control switching station of being made up of two cup valves with the switching of diffusing.
Beneficial effect of the present invention:
1, absolutely dry method reclaims, and has saved a large amount of process waters;
2, low-grade physics sensible heat and iron content dust are recycled to greatest extent;
3, be provided with spark catcher, reduced explosion hazard reliably;
4, adopt coal gas bag-type dust remover, dust removing effects is obvious.
Description of drawings
Fig. 1 is a process flow sheet of the present invention
Among Fig. 1,1 converter, 2 gasification cooling flues, 3 sparkers, 4 waste heat boilers, 5 cinder e Foerderanlages, 6 cinder ash-storing bins, 7 thin grey e Foerderanlages, 8 thin grey ash-storing bins, 9 sack cleaners, 10 frequency transformers, 11 centrifugal gas blowers, 12 sound dampers, 13 gas analysis instrument, 14 recovery cup valves, 15 diffuse a glass valve, 16 gas coolers, 17 diffuse chimney, 18 gas chambers
Embodiment
1 do concrete embodiment explanation with reference to the accompanying drawings below, coal gas of converter enters gasification cooling flue (2) from converter (1), and temperature drops to 800～1000 ℃ from about 1450 ℃.Enter spark catcher (3) afterwards, coal gas of converter is isolated the band spark coarse particles that sets off an explosion easily in (3).Enter waste heat boiler (4) afterwards and be cooled to about 200 ℃, the steam that waste heat boiler is collected can be used for generating or it.The cinder dirt of collecting from spark catcher (3) and waste heat boiler (4) enters cinder ash-storing bin (6) by the cinder e Foerderanlage (5) of its underpart.Coal gas of converter enters pulse of nitrogen coal gas bag-type dust remover (9) afterwards, thin dust is removed, the dust that is enriched on the cloth bag is blown off by the pulse of nitrogen blowback, and the thin dust that pulse of nitrogen coal gas bag-type dust remover (9) is collected enters thin grey ash-storing bin (8) by the thin grey e Foerderanlage (7) of its underpart.The aerodynamic force of system is provided by centrifugal gas blower (11), and its load is by accurately control of frequency transformer (10), and is provided with sound damper (12) in outlet and alleviates noise.The coal gas of converter composition is detected by gas analysis instrument (13), and when meeting the recovery standard, recovery cup valve (14) is opened, enter gas cooler (16) and be cooled to about 70 ℃, after enter gas chamber (18) and store; When not meeting the recovery standard, diffuse a glass valve (15) and open, coal gas enters and diffuses chimney (17) and diffused by being lighted.
Below table 1 be example with the 150t converter, the benefit advantage of the present invention than the LT method is described.
The benefit contrast of table one technology of the present invention and LT method
| Title | The LT method | Technology of the present invention |
| Coal-gas recovering amount (Nm 3/ t steel) | 100 | 100 |
| Amount of steam withdrawn (Kg/t steel) | 80 | 130-140 |
| Current consumption (KWh/t steel) | 6.2 | 6.4 |
| Water loss (Kg/t steel) | 150 | 0 |
| Consumption nitrogen amount (m 3/h) | 1800 | 800 |
| Discharge index (mg/Nm 3) | ＞10 | ＜10 |
| Failure condition | High: the electric precipitation complex structure | Low: bag-type dust is simple in structure |
| Safety | Dangerous: the often interior often blast of electric precipitator | Safety: hidden peril of explosion is removed, does not have ignition source in the sack cleaner |
| Investment cost (ten thousand yuan) | 4500 | 3000 |
Claims (10)
1. converter gas dry method dedusting and thermal recovery unit, comprise converter, gasification cooling flue, spark catcher, waste heat boiler, pulse of nitrogen coal gas bag-type dust remover, switch cup valve, gas cooler, gas chamber, diffuse chimney and thickness ash delivery system, it is characterized in that: the gasification cooling flue outlet connects spark catcher, the spark catcher outlet connects waste heat boiler, heat boiler outlet connects sack cleaner, and the sack cleaner outlet connects centrifugal gas blower.
2. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described spark catcher is high temperature (water-cooled or vaporization cooling) double cyclone.
3. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described waste heat boiler is the high-efficiency heat pipe waste heat boiler.
4. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described sparker and waste heat boiler bottom are provided with the cinder delivery system, comprise cinder e Foerderanlage and cinder ash-storing bin.
5. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described sack cleaner is the pulse of nitrogen coal gas bag-type dust remover.
6. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described sack cleaner bottom is provided with thin grey delivery system, comprises thin grey e Foerderanlage and thin grey ash-storing bin.
7. according to claim 4 and 6 described converter gas dry method dedusting and thermal recovery units, it is characterized in that: described cinder and thin grey e Foerderanlage are zip mode conveying or air conveying.
8. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: described centrifugal gas blower is by Frequency Converter Control, and outlet is provided with sound damper.
9. converter gas dry method dedusting according to claim 1 and thermal recovery unit is characterized in that: coal-gas recovering adopts the hydrostatic control switching station of being made up of two cup valves with the switching of diffusing.
10. converter gas dry method dedusting and heat recovery technique, it is characterized in that: coal gas of converter has the high temperature about 1450 ℃ near the converter outlet, be cooled to 800～1000 ℃ through behind the gasification cooling flue; After this enter spark catcher, its effect is to remove the big dust particle that has Mars that deenergizes and set off an explosion, and preventing to occur blast in the follow-up UTILIZATION OF VESIDUAL HEAT IN technological process may; The coal gas of converter of removing big particle enters waste heat boiler and is cooled to below 200 ℃, has reclaimed 800～1000 ℃ to 200 ℃ physics sensible heat around here, can produce a large amount of steam for the generating or its usefulness, and in this process without any need for service water; Coal gas of converter after the cooling enters the pulse of nitrogen coal gas bag-type dust remover and makes smart dust removal process, sack cleaner stable adaptability simple in structure is strong, and not limited by dust than resistance value, adopt the anti-electrostatic filtrate not have electrical spark to produce, be difficult for blast, thereby also just do not have the described blast shortcoming of electric precipitation; Its efficiency of dust collection height, the outlet dust concentration can be controlled in below the 10mg/Nm3, far below discharging standards; Be provided with centrifugal gas blower after the pulse of nitrogen coal gas bag-type dust remover, in order to system dynamic to be provided; In the subsequent technique at sack cleaner and gas cooler, gas chamber and diffuse and be provided with shifter between the chimney, when the content of CO in the coal gas and O2 meets the recovery standard, recovery cup valve is opened, and coal gas of converter is cooled to by gas cooler and enters the gas chamber storage below 70 ℃ again; When the content of CO in the coal gas and O2 does not meet the recovery standard, diffuse a glass valve and open, coal gas of converter enters and diffuses chimney and lighted and diffuse.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102078407A CN101942538A (en) | 2010-06-24 | 2010-06-24 | Process and equipment for dust collection and heat recovery by converter gas dry method |
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| CN2010102078407A CN101942538A (en) | 2010-06-24 | 2010-06-24 | Process and equipment for dust collection and heat recovery by converter gas dry method |
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| CN101942538A true CN101942538A (en) | 2011-01-12 |
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| CN2010102078407A Pending CN101942538A (en) | 2010-06-24 | 2010-06-24 | Process and equipment for dust collection and heat recovery by converter gas dry method |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373312A (en) * | 2011-10-31 | 2012-03-14 | 中冶南方工程技术有限公司 | Primary fume dry method dedusting system of vanadium recovery converter |
| CN102382935A (en) * | 2011-10-31 | 2012-03-21 | 中冶南方工程技术有限公司 | One-time flue gas dry-process dust removing process of vanadium-extraction converter |
| CN102382934A (en) * | 2011-10-31 | 2012-03-21 | 中冶南方工程技术有限公司 | Converter primary flue gas dry dedusting system |
| CN102676729A (en) * | 2012-06-05 | 2012-09-19 | 中冶华天南京工程技术有限公司 | Dry-process dust removing system based on recycling of converter smoke heat pipe waste heat and dust removal of filter bag |
| CN102676734A (en) * | 2012-06-08 | 2012-09-19 | 中冶赛迪工程技术股份有限公司 | Converter gas waste heat recovery device and method |
| CN102912074A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing dry process dust removal system from exhausting yellow smoke |
| CN102943151A (en) * | 2012-10-24 | 2013-02-27 | 杭州杭真真空工程技术有限公司 | Steel liquid vacuum refinement system adopting complete-dry type mechanical vacuum pump |
| CN103374641A (en) * | 2012-04-20 | 2013-10-30 | 佛山市三叶环保设备工程有限公司 | Converter gas cloth-bag dust-removing purification method based on energy recycling |
| CN103757175A (en) * | 2014-01-17 | 2014-04-30 | 辽宁环宇环保技术有限公司 | Converter high-temperature flue gas heat recovery and dust purification system |
| CN103849705A (en) * | 2014-03-04 | 2014-06-11 | 中钢集团天澄环保科技股份有限公司 | Waste heat recycling and fine particle purifying system and method of converter gas |
| CN104880090A (en) * | 2015-06-02 | 2015-09-02 | 阳城县华王通用离心铸管厂 | Combustible gas long-distance delivery and reutilization device of cupola furnace |
| CN104962681A (en) * | 2015-06-26 | 2015-10-07 | 汤海军 | Waste-heat-recovery converter dry-method dust removal process |
| CN105063272A (en) * | 2015-07-17 | 2015-11-18 | 无锡亿恩科技股份有限公司 | Novel two-stage type converter gas waste heat recovery system |
| CN107058673A (en) * | 2017-02-15 | 2017-08-18 | 中冶南方工程技术有限公司 | A kind of converter gas waste heat safety recovery system and method |
| CN107739771A (en) * | 2017-11-30 | 2018-02-27 | 北京瑞达宏信科技有限公司 | Coal gas of converter heat energy full-dry method purifying recovery method and its device |
| CN109355456A (en) * | 2018-12-26 | 2019-02-19 | 无锡雪浪环境科技股份有限公司 | A kind of converter coal gas purification recycles and combines the device and application method of final dusting |
| CN115197755A (en) * | 2022-07-19 | 2022-10-18 | 北京航天迈未科技有限公司 | Processing system of high temperature flue gas |
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| CN201136877Y (en) * | 2007-12-06 | 2008-10-22 | 北京博鹏北科科技有限公司 | Generating set through recovery waste beat of converter coal gas and dust cleaning apparatus by dry method |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102373312A (en) * | 2011-10-31 | 2012-03-14 | 中冶南方工程技术有限公司 | Primary fume dry method dedusting system of vanadium recovery converter |
| CN102382935A (en) * | 2011-10-31 | 2012-03-21 | 中冶南方工程技术有限公司 | One-time flue gas dry-process dust removing process of vanadium-extraction converter |
| CN102382934A (en) * | 2011-10-31 | 2012-03-21 | 中冶南方工程技术有限公司 | Converter primary flue gas dry dedusting system |
| CN102382935B (en) * | 2011-10-31 | 2013-05-01 | 中冶南方工程技术有限公司 | One-time flue gas dry-process dust removing process of vanadium-extraction converter |
| CN102373312B (en) * | 2011-10-31 | 2013-06-19 | 中冶南方工程技术有限公司 | Primary fume dry method dedusting system of vanadium recovery converter |
| CN103374641A (en) * | 2012-04-20 | 2013-10-30 | 佛山市三叶环保设备工程有限公司 | Converter gas cloth-bag dust-removing purification method based on energy recycling |
| CN102676729A (en) * | 2012-06-05 | 2012-09-19 | 中冶华天南京工程技术有限公司 | Dry-process dust removing system based on recycling of converter smoke heat pipe waste heat and dust removal of filter bag |
| CN102676729B (en) * | 2012-06-05 | 2014-01-15 | 中冶华天南京工程技术有限公司 | Dry-process dust removing system based on recycling of converter smoke heat pipe waste heat and dust removal of filter bag |
| CN102676734A (en) * | 2012-06-08 | 2012-09-19 | 中冶赛迪工程技术股份有限公司 | Converter gas waste heat recovery device and method |
| CN102943151B (en) * | 2012-10-24 | 2015-05-06 | 杭州杭真真空工程技术有限公司 | Steel liquid vacuum refinement system adopting complete-dry type mechanical vacuum pump |
| CN102943151A (en) * | 2012-10-24 | 2013-02-27 | 杭州杭真真空工程技术有限公司 | Steel liquid vacuum refinement system adopting complete-dry type mechanical vacuum pump |
| CN102912074B (en) * | 2012-11-08 | 2014-05-21 | 攀钢集团研究院有限公司 | Method for preventing dry process dust removal system from exhausting yellow smoke |
| CN102912074A (en) * | 2012-11-08 | 2013-02-06 | 攀钢集团研究院有限公司 | Method for preventing dry process dust removal system from exhausting yellow smoke |
| CN103757175A (en) * | 2014-01-17 | 2014-04-30 | 辽宁环宇环保技术有限公司 | Converter high-temperature flue gas heat recovery and dust purification system |
| CN103849705B (en) * | 2014-03-04 | 2016-01-06 | 中钢集团天澄环保科技股份有限公司 | RECOVERY OF CONVERTER GAS UTILIZATION OF VESIDUAL HEAT IN and minuteness particle purification system |
| CN103849705A (en) * | 2014-03-04 | 2014-06-11 | 中钢集团天澄环保科技股份有限公司 | Waste heat recycling and fine particle purifying system and method of converter gas |
| CN104880090A (en) * | 2015-06-02 | 2015-09-02 | 阳城县华王通用离心铸管厂 | Combustible gas long-distance delivery and reutilization device of cupola furnace |
| CN104880090B (en) * | 2015-06-02 | 2017-06-13 | 阳城县华王通用离心铸管厂 | Furnace cupola fuel gas long-distance sand transport reuse means |
| CN104962681A (en) * | 2015-06-26 | 2015-10-07 | 汤海军 | Waste-heat-recovery converter dry-method dust removal process |
| CN105063272A (en) * | 2015-07-17 | 2015-11-18 | 无锡亿恩科技股份有限公司 | Novel two-stage type converter gas waste heat recovery system |
| CN105063272B (en) * | 2015-07-17 | 2017-09-22 | 无锡亿恩科技股份有限公司 | New two-period form afterheat of converter gas recovery system |
| CN107058673A (en) * | 2017-02-15 | 2017-08-18 | 中冶南方工程技术有限公司 | A kind of converter gas waste heat safety recovery system and method |
| CN107739771A (en) * | 2017-11-30 | 2018-02-27 | 北京瑞达宏信科技有限公司 | Coal gas of converter heat energy full-dry method purifying recovery method and its device |
| CN109355456A (en) * | 2018-12-26 | 2019-02-19 | 无锡雪浪环境科技股份有限公司 | A kind of converter coal gas purification recycles and combines the device and application method of final dusting |
| CN115197755A (en) * | 2022-07-19 | 2022-10-18 | 北京航天迈未科技有限公司 | Processing system of high temperature flue gas |
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Open date: 20110112 |