CN100419090C - Converter coal gas wet-type cloth bag purification recovering process and system - Google Patents
Converter coal gas wet-type cloth bag purification recovering process and system Download PDFInfo
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- CN100419090C CN100419090C CNB2007100392281A CN200710039228A CN100419090C CN 100419090 C CN100419090 C CN 100419090C CN B2007100392281 A CNB2007100392281 A CN B2007100392281A CN 200710039228 A CN200710039228 A CN 200710039228A CN 100419090 C CN100419090 C CN 100419090C
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Abstract
The invention relates to a kind of wet cloth bag purifying and recovery technology of converter gas and its system. In the invention, the gas and water mist carry out heat and mass transfer when the high temperature gas containing dust goes into the evaporative cooler or saturated spray tower through the dry and seal flexible connecting device, at the same time, the dust and mist impact and condense to remove a majority of coarse particle dust and fall into the water seal ash bucket, and then the gas after cooling and rough dust elimination goes into the wet bag filter through pipeline, then the gas is purified and recovered after water spray cooling process. The purification recovery system includes an evaporative cooler, a wet bag filter, a water seal, a Venturi flow-meter, a gas blower, valves and three-way switching valves, a emission chimney, and an automatic control system.
Description
Technical field
The present invention relates to the converter steelmaking of metallurgical steel mill and produce, particularly a kind of coal gas of high temperature wet-type cloth bag purification in the convertor steelmaking process and recovery technology and system.
Background technology
At present steel mill's converter cleaning and recovering process mainly adopts two kinds of wet method (being called for short OG) and dry method (abbreviation LT).
The converter gas wet refining plant that with OG is representative mainly is made up of secondary purification device and dewatering unit.The first step: adopt sizing or manual path transfer overflow Venturi meter (being called for short a literary composition), its effect is to be the cooling and the thick dedusting of raw gas; The second stage: adopt automatic path transfer Venturi meter (being called for short two literary compositions) or adopt circumferential weld washer (being called for short RSW), its effect is to be the smart dedusting of raw gas; Dewatering unit is as the moisture that removes in the piped gas.China has a considerable amount of coal gas of converter OG system to exist to some extent: high dust discharge, coal gas discharging dust content surpasses 100mg/Nm
3High equipment operation energy consumption, system's running resistance surpasses 20kPa; Low ton steel coal-gas recovering, average ton steel coal-gas recovering amount is only at 50mg/Nm
3About.
The converter gas dry method refining plant that with LT is representative mainly is made up of evaporative cooler, electrostatic precipitator and gas cooler etc.Though and coal gas of converter LT purification recovery system obviously is better than OG on gas purification and system energy consumption, but because of the LT method needs from external imported technology, invest higher, more and the reasons such as equipment tackling key problem and operating experience of electrostatic precipitator fault, influenced and popularized, only there is block converter more than 10 in the whole nation at present, and the whole world has the coal gas of block converter more than 50 to adopt the dry cleaning recovery system.
Summary of the invention
Task of the present invention provides a kind of improved converter coal gas wet-type cloth bag purification recovering process and system, it has solved the existing dust discharge of wet method of the prior art and equipment operation energy consumption height, ton steel coal-gas recovering is low, and problems such as height, electrostatic precipitator fault are many need be introduced technology, be invested to dry method.
Technical solution of the present invention is as follows:
A kind of converter coal gas wet-type cloth bag purification recovering process, converter produces high temperature dust coal gas period in blowing, by the evaporated flue cooling system gas temperature is reduced to 800 ℃～1000 ℃, when described high temperature dust coal gas enters evaporative cooler or saturated spray column by the dry seal flexible connecting device, coal gas and water smoke carry out heat and mass, simultaneously flue dust clashes into and condenses with water smoke, most crude particle dust is removed and falls into the water seal ash bucket, and gas temperature is reduced to 75 ℃ rapidly at this moment; Enter the wet-type cloth bag fly-ash separator through the coal gas after cooling and the thick dedusting by pipeline then, after the cloth bag sprinkling system was further sprayed water cooling process, saturated coal gas entered the filter bag layer and purifies; The gas composition signal that coal gas after the purification is measured according to gas analyzer is switched by three-way switch valve, reclaims respectively or diffuses, and it is not high because of carbon monoxide content in the flue gas to bessemerize initial stage and latter stage, by entering atmosphere after the chimney burning; When payback period, coal gas is sent into gas chamber through water seal valve and gas main.
A kind of system that implements converter coal gas wet-type cloth bag purification recovering process, described purification recovery system comprises evaporative cooler or saturated spray column, wet-type cloth bag fly-ash separator, the coal gas water seal, Venturi tube, gas fan, valve and three-way switch valve diffuse chimney and automatic control system; Be connected by the dry seal flexible connecting device between described evaporated flue and evaporative cooler or the saturated spray column, replace the water-lute coupling device; Be connected by pipeline between described evaporative cooler or saturated spray column and the wet-type cloth bag fly-ash separator; The back of described wet-type cloth bag fly-ash separator connects gas line, Venturi tube, gas fan, valve, three-way switch valve is installed on gas line, is diffused chimney and water seal valve.
The advantage of converter coal gas wet-type cloth bag purification recovering process of the present invention system is, gas purification efficient height, and system's running resistance and energy consumption are low, and coal-gas recovering amount height, pipeline are difficult for stopping up.Coal gas discharging dust content after the purification is at 10mg/Nm
3Below, system's running resistance is below 10kPa, and converter ton steel coal-gas recovering amount is at 90mg/Nm
3More than.
Wet-type cloth bag purification recovering process of the present invention system meets strict environmental protection requirement, has reached to reclaim the purpose of coal gas, and has realized that negative converter can make steel.This cleaning and recovering process system is both applicable to gas purification and recovery to newly-built converter project, also applicable to the technological transformation to existing coal gas of converter OG or LT system.
Description of drawings
Accompanying drawing is the schematic flow sheet of a kind of converter coal gas wet-type cloth bag purification recovering process of the present invention and system.
Number in the figure 1 is converter, and 2 is gasification cooling flue, and 3 is the dry seal flexible connecting device, 4 is evaporative cooler or spray column, and 5 is the wet type pulsed jet cloth filter, and 6 is Venturi tube, 7 is gas fan, and 8 is sourdine, and 9 is by-pass valve, 10 is three-way switch valve, and 11 are the water seal reverse checkvalve, and 12 is the V-type water-sealed valve, 13 for diffusing chimney, and 14 for sending to gas chamber, and 15 is nitrogen or steam, 16 is spray water, and 17 is gas line.
Embodiment
Referring to accompanying drawing, the present invention is a kind of converter coal gas wet-type cloth bag purification recovering process and system, the high temperature dust coal gas of the blowing period generation of metallurgical steel mill converter in steelmaking process, by the evaporated flue cooling system gas temperature is reduced to 800 ℃～1000 ℃, enter the gas purification recovery system then.
When high temperature dust coal gas enters evaporative cooler or saturated spray column by the dry seal flexible connecting device, coal gas and water smoke carry out heat and mass, flue dust and water smoke clash into and condense simultaneously, most crude particle dust is removed and falls into the water seal ash bucket, this moment, gas temperature was reduced to rapidly about 75 ℃.Then, enter the wet-type cloth bag fly-ash separator through the coal gas after cooling and the thick dedusting by pipeline, after the cloth bag sprinkling system was further sprayed water cooling process, saturated coal gas entered the filter bag layer and purifies.Coal gas after the purification, its dust content is less than 10mg/Nm
3, the signals such as gas composition according to gas analyzer is measured are switched by three-way switch valve, reclaim respectively or diffuse, and it is not high because of carbon monoxide content in the flue gas to bessemerize initial stage and latter stage, by entering atmosphere after the chimney burning.When payback period, coal gas is sent into gas chamber through water seal valve such as water seal reverse checkvalve, V-type water-sealed valve and gas main.
Converter coal gas wet-type cloth bag purification recovery system of the present invention comprises evaporative cooler or saturated spray column 4, wet type pulsed jet cloth filter 5, coal gas water seal, Venturi tube 6, gas fan 7, valve and three-way switch valve 10 diffuse chimney 13 and automatic control system.
Be connected by dry seal flexible connecting device 3 between gasification cooling flue 2 and evaporative cooler or the saturated spray column 4, replaced the water-lute coupling device of prior art.
The present invention is a literary composition with sizing or the manual path transfer overflow Venturi meter that evaporative cooler or saturated spray column 4 have replaced in the wet purification device; The automatic path transfer Venturi meter that has replaced in the wet purification device with wet-type cloth bag fly-ash separator 5 is that two literary compositions or circumferential weld washer are RSW, or the electrostatic precipitator in the dry cleaning device.Be connected by pipeline between evaporative cooler or saturated spray column 4 and the wet-type cloth bag fly-ash separator 5.
Evaporative cooler 4 mainly is made up of apparatus body, spray gun, water supply and five parts such as airing system and Controlling System.Select water, nitrogen or steam two-phase flow automatic nozzle for use, to obtain stable fine water-spray particle.According to coal gas of converter temperature and tolerance fluctuation, by in device, spraying into an amount of air water mist particle, make water smoke in device, be vaporized into water vapor and enter gas phase, utilize the latent heat of vaporization of water that flue-gas temperature is reduced to design temperature in moment, simultaneously the water seal ash bucket is removed and fallen into to most crude particle dust in the flue gas.
Wet type pulsed jet cloth filter 5 mainly partly is made up of fly-ash separator housing, wet type filter bag, pulse jet mechanism, water seal ash bucket automatic sewage discharging device, spray and rinse-system and Controlling System etc.Filter bag is to be made by the overlay film of permeable watertight or class coating material, the surface attachment water membrane, and when dust-laden coal gas was passed in the export-oriented bag by bag, dust was trapped in outside surface by filter bag and is passed through by purified gas.Along with thickening of filter bag outside surface dust layer, the fly-ash separator running resistance rises, and prescribes a time limit when resistance reaches going up of set(ting)value, and Controlling System starting impulse nitrogen-blow mechanism carries out automatic ash removing, and the water seal ash bucket is stripped from and is fallen into to dirt mud.
The back of wet-type cloth bag fly-ash separator 5 connects gas line 17, Venturi tube 6, gas fan 7, valve and three-way switch valve 10 is installed on gas line 17, is diffused chimney 13 and water seal valve.The valve of being installed on gas line 17 has with diffusing the by-pass valve 9 that chimney 13 connects.The water seal valve of being installed on gas line 17 has water seal reverse checkvalve 11 and V-type water-sealed valve 12.
In order to save power consumption, fluid-flywheel clutch set up by induced draft fan or variable-frequency motor carries out speed governing, in non-blowing process reduction of speed running.Sourdine 8 is equipped with in the gas fan outlet of being adorned on the gas line, and the may command noise is less than 85dB.
Purification recovery system of the present invention also has following characteristics: converter mouth elementary errors pressure-controlled is controlled automatically by speed-changing draught fan; Adopt the lower blower fan of power to replace the high wet method blower fan of power; Water trap in the cancellation wet method system, or the gas cooler in the dry method system.
Purification recovery system of the present invention has automatic flushing and dirt eliminating function, can regularly wash automatically the dirt mud that is deposited in the coal gas dust removal pipeline; To be deposited in coal gas water seal and each equipment water seal ash bucket mud and sewage, enter factory's open channel or blowdown main to the sludge treatment station by each water seal automatic sewage discharging device and rinse-system.
Cleaning and recovering process of the present invention and system are applicable to gas purification and recovery to newly-built converter project, also applicable to the overall technique transformation to existing coal gas of converter OG system.Mainly take following measures: with the literary composition in evaporative cooler or the saturated spray column replacement OG system, evaporated flue adopts the dry seal flexible connecting device to replace the water-lute coupling device with being connected of evaporative cooler or saturated spray column, with two literary compositions or the RSW in the wet-type cloth bag fly-ash separator replacement OG system, change the lower blower fan apparatus of power, and the water trap in the cancellation OG system and the control requirement of the system of modification etc.When being used for the segmentation transformation, the major measure of taking is: two literary compositions or RSW with in the wet-type cloth bag fly-ash separator replacement OG system, change the lower blower fan of power, and the control requirement of the water trap in the cancellation OG system and the system of modification etc.
Cleaning and recovering process of the present invention and system are also applicable to the technological transformation to existing coal gas of converter LT system.Mainly take following measures: with the electrostatic precipitator in the wet-type cloth bag fly-ash separator replacement LT system, gas cooler in the cancellation LT system, the control of modification system requires and checks whether blower fan apparatus needs to change or ventilating fan only, sets up plumbing and sludge treating system etc.
Claims (6)
1. converter coal gas wet-type cloth bag purification recovering process, converter produces high temperature dust coal gas period in blowing, by the evaporated flue cooling system gas temperature is reduced to 800 ℃～1000 ℃, it is characterized in that, when described high temperature dust coal gas enters evaporative cooler or saturated spray column by the dry seal flexible connecting device, coal gas and water smoke carry out heat and mass, flue dust and water smoke clash into and condense simultaneously, most crude particle dust is removed and falls into the water seal ash bucket, this moment, gas temperature was reduced to 75 ℃ rapidly; Enter the wet-type cloth bag fly-ash separator through the coal gas after cooling and the thick dedusting by pipeline then, after the cloth bag sprinkling system was further sprayed water cooling process, saturated coal gas entered the filter bag layer and purifies; The gas composition signal that coal gas after the purification is measured according to gas analyzer is switched by three-way switch valve, reclaims respectively or diffuses, and it is not high because of carbon monoxide content in the flue gas to bessemerize initial stage and latter stage, by entering atmosphere after the chimney burning; When payback period, coal gas is sent into gas chamber through water seal valve and gas main.
2. system that implements the described converter coal gas wet-type cloth bag purification recovering process of claim 1, it is characterized in that, described purification recovery system comprises evaporative cooler or saturated spray column, the wet-type cloth bag fly-ash separator, the coal gas water seal, Venturi tube, gas fan, valve and three-way switch valve diffuse chimney and automatic control system; Be connected by the dry seal flexible connecting device between described evaporated flue and evaporative cooler or the saturated spray column, replace the water-lute coupling device; Be connected by pipeline between described evaporative cooler or saturated spray column and the wet-type cloth bag fly-ash separator; The back of described wet-type cloth bag fly-ash separator connects gas line, Venturi tube, gas fan, valve, three-way switch valve is installed on gas line, is diffused chimney and water seal valve.
3. converter coal gas wet-type cloth bag purification recovery system according to claim 2 is characterized in that, the valve of being installed on the described gas line has with diffusing the by-pass valve that chimney connects.
4. converter coal gas wet-type cloth bag purification recovery system according to claim 2 is characterized in that the water seal valve of being installed on the described gas line has the water seal reverse checkvalve.
5. converter coal gas wet-type cloth bag purification recovery system according to claim 2 is characterized in that the water seal valve of being installed on the described gas line has the V-type water-sealed valve.
6. converter coal gas wet-type cloth bag purification recovery system according to claim 2 is characterized in that, sourdine is equipped with in the gas fan outlet of being adorned on the described gas line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100392281A CN100419090C (en) | 2007-04-06 | 2007-04-06 | Converter coal gas wet-type cloth bag purification recovering process and system |
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| CNB2007100392281A CN100419090C (en) | 2007-04-06 | 2007-04-06 | Converter coal gas wet-type cloth bag purification recovering process and system |
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| CN101033497A CN101033497A (en) | 2007-09-12 |
| CN100419090C true CN100419090C (en) | 2008-09-17 |
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Families Citing this family (10)
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| CN101619376B (en) * | 2009-07-31 | 2011-01-12 | 清华大学 | System for recovering converter gas sensible heat |
| CN101736117B (en) * | 2009-12-17 | 2011-09-28 | 宝钢工程技术集团有限公司 | Converter fume high-temperature bag dust removal and recycling and secondary steam recycling system |
| CN102304603A (en) * | 2011-09-08 | 2012-01-04 | 北京京诚科林环保科技有限公司 | Waste heat recovery and bag-type dust removal system |
| CN102344987B (en) * | 2011-10-31 | 2013-09-18 | 中冶南方工程技术有限公司 | Primary flue gas dry dedusting process for vanadium recovering converter |
| CN102851438B (en) * | 2012-09-06 | 2014-03-19 | 扬州高立达科技产业有限公司 | Converter coal gas waste heat utilization apparatus |
| CN106702076B (en) * | 2015-11-17 | 2018-10-09 | 鞍钢股份有限公司 | A method of prevent converter dust from polluting environment |
| CN107321114A (en) * | 2017-08-18 | 2017-11-07 | 安徽天顺环保设备股份有限公司 | A kind of efficient circulation bag-type dust equipment |
| CN110734786A (en) * | 2018-11-22 | 2020-01-31 | 上海境业环保能源科技股份有限公司 | self-cleaning filter |
| 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 |
| CN116966724B (en) * | 2023-09-19 | 2023-12-12 | 山西诺成制药有限公司 | Solvent circulation type efficient absorption spray tower |
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| CN1101379A (en) * | 1993-10-04 | 1995-04-12 | 首钢总公司 | Wet dust-collecting process for fume |
| JPH083627A (en) * | 1994-06-22 | 1996-01-09 | Nkk Corp | Dust collecting equipment of vacuum degassing equipment |
| JP2000227284A (en) * | 1999-02-03 | 2000-08-15 | Nippon Steel Corp | Vacuum refining equipment |
| CN1276098C (en) * | 2002-09-04 | 2006-09-20 | 上海外高桥喷雾系统有限公司 | Technique for dedusting flue gas of rotating furnace through semi-dry process |
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2007
- 2007-04-06 CN CNB2007100392281A patent/CN100419090C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1101379A (en) * | 1993-10-04 | 1995-04-12 | 首钢总公司 | Wet dust-collecting process for fume |
| JPH083627A (en) * | 1994-06-22 | 1996-01-09 | Nkk Corp | Dust collecting equipment of vacuum degassing equipment |
| JP2000227284A (en) * | 1999-02-03 | 2000-08-15 | Nippon Steel Corp | Vacuum refining equipment |
| CN1276098C (en) * | 2002-09-04 | 2006-09-20 | 上海外高桥喷雾系统有限公司 | Technique for dedusting flue gas of rotating furnace through semi-dry process |
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| CN101033497A (en) | 2007-09-12 |
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Owner name: BAOSTEER ENGINEERING TECHNOLOGY GROUP CO., LTD Free format text: FORMER OWNER: BAOGANG ENGINEERING TECHN CO., LTD., SHANGHAI Effective date: 20100721 |
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Effective date of registration: 20100721 Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2510 Patentee after: Baosteel Engeneering &Technology Group Co., Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2510 Patentee before: Shanghai Baogang Engineering Technology Co., Ltd. |
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