CN101851695A - Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter - Google Patents
Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter Download PDFInfo
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- CN101851695A CN101851695A CN 201010176278 CN201010176278A CN101851695A CN 101851695 A CN101851695 A CN 101851695A CN 201010176278 CN201010176278 CN 201010176278 CN 201010176278 A CN201010176278 A CN 201010176278A CN 101851695 A CN101851695 A CN 101851695A
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Abstract
The invention relates to a dry bag-type coal gas purifying and recycling process for an oxygen-resistant converter. In the process, a bag-type dust collector is adopted and a venturi or an electrostatic dust collector is eliminated. A spark arrester is arranged in front of the bag-type dust collector for extinguishing sparks in smoke so as to prevent the sparks from entering the bag-type dust collector and burning a filter bag out or causing explosion. The technical characteristic of the process is that: smoke of which O2 content surpasses an explosion limit is not allowed to enter the bag-type dust collector. If the O2 content of smoke produced between a previous burning period and a next burning period of the converter is less than 2 percent, the smoke can directly enter a coal gas purifying and recycling system of the converter. After temperature reduction and extinguishment are performed, the smoke enters the bag-type dust collector for collecting dust and is recycled or dispersed according to coal gas content after dust collection reaches the standard. If the O2 content of smoke produced in feeding, steel discharging and other periods of the converter is more than or equal to 2 percent, the smoke is not allowed to enter the coal gas purifying and recycling system of the converter. Burned smoke can only be extracted through a smoke outlet on an enclosed cap of the converter and is discharged after dust in the smoke is removed to reach the standard through a secondary smoke dust removing system of the converter.
Description
Technical field
The invention belongs to metallurgy industry converter steelmaking environmental technology field, particularly a kind of dry cloth bag purifying recovery novel process that coal gas of steel-smelting revolving furnace is purified recovery.
Background technology
Existing steel converter coal gas purification reclaims technology and mainly contains two kinds of OG method (wet method) and LT methods (dry method).The OG method mainly uses Venturi meter as treating plant, and dedusting is carried out in washing to converter raw gas water spray in Venturi meter, and treating plant and pipeline are easy to generate the fouling blockage problem, and decontamination effect improving can not get guaranteeing that systematic running cost is quite high.At the problem that wet method system exists, developed the LT method.LT method treating plant is mainly electrostatic precipitator, relies on positive and negative electrode to carry out dedusting.Because the electrostatic precipitator working temperature about 150 ℃, need directly be sprayed water to the converter raw gas and carry out transpiration cooling, raw gas temperature and injection flow rate are restive, and the easy corrosion cracking of electrostatic precipitator electrode influences efficiency of dust collection.Above-mentioned two kinds of method fluctuations of service, the dust content of gas after the purification is too high, and smoke stack emission concentration exceeds standard often.
Summary of the invention
For making the converter coal gas purification recovery system stable, task of the present invention provides a kind of oxygen-insulating type converter coal gas dry-method bag-type dust collecting and purifies the recovery novel process, and it has solved the problem that dust content of gas is too high and smoke stack emission concentration exceeds standard often after purifying.
Technical scheme of the present invention is as follows:
Treating plant of the present invention adopts sack cleaner, cancellation Venturi meter or electrostatic precipitator, purification efficiency height, stable equipment operation.The working temperature of sack cleaner reaches as high as 260 ℃, and its operating temperature range is wide to be easy to control raw gas temperature and injection flow rate.Newly-increased Spark Annihilator can extinguish the Mars in the flue gas before sack cleaner, prevents that Mars from entering sack cleaner and burning filter bag or produce blast.According to the constructional feature of sack cleaner, change converter coal gas purification recovery system operating process in the past, initiate new converter coal gas purification recovery system operating procedure.Its characteristics are exactly the smoke components that control enters sack cleaner, do not allow to contain O
2The flue gas that amount surpasses limits of explosion enters sack cleaner.
The flue gas that burning phase and back burning produced between the phase before converter, O
2Content is quite low, and the flue gas main component is CO, N
2, CO
2The flue gas that produces in converter during this period of time can directly enter the converter coal gas purification recovery system, carries out dedusting by sack cleaner.Flue gas enters from the sack cleaner bottom, filters in the filtration chamber at middle part, and flue dust is delayed at the filter bag upper layer, and clean air passes filter bag and enters cleaning chamber, and the gas after up to standard just can be by smoke stack emission.Be blocked in the flue dust on the filter bag, regularly clear up, the flue dust after the cleaning will regularly be discharged, and filter bag can repeat to filter flue gas.
, tapping reinforced and the flue gas that produces other periods in converter, O
2Content just can not enter the converter coal gas purification recovery system than higher.The flue gas time that this period produces is short, quantity is few, can perfect combustion at fire door CO.The gas fume after burning entrained air is discharged by existing converter secondary flue gas dust-removal system.
The converter current coal gas dry-method purifies recovery system and also exists some problems can not replace the wet purification recovery system fully.The present invention has given full play to dry cleaning recovery system running resistance and advantage of low energy consumption, and the gas purification stabilization efficiency is higher, the purified gas better quality, and smoke stack emission concentration is lower, and the energy-saving and environmental protection effect is obvious, can replace the wet purification recovery system fully.
Description of drawings
Accompanying drawing is a kind of oxygen-insulating type converter coal gas dry-method bag-type cleaning and recovering process schematic flow sheet of the present invention.
Embodiment
Referring to accompanying drawing, the present invention be a kind of have to stop contain O
2The converter coal gas dry-method bag-type purification recovery novel process that amount enters sack cleaner and newly-increased Spark Annihilator above the flue gas of limits of explosion, it comprises converter 1, gasification cooling flue 2, wet cooling tower 3, gas line 4, Spark Annihilator 5, gas valve 6, sack cleaner 7, gas fan 8, sourdine 9, three-way switch valve 10, diffuses chimney 11.
Converter 1 is a steelmaking equipment, is arranged on gasification cooling flue 2 belows, with gasification cooling flue 2 lower ends certain interval is arranged;
Gasification cooling flue 2 is made of steel pipe, and steel pipe carries out pipe sealing of tube is surrounded toroidal, feeds deoxygenation soft water in the steel pipe high-temperature flue gas by flue is carried out the indirect vaporizing cooling.The one end is arranged on converter 1 top, and the other end is connected with wet cooling tower top;
Wet cooling tower 3 is cylindrical structures.Wet cooling tower 3 is provided with waterworks, the flue gas that passes through is directly sprayed water carry out transpiration cooling.Wet cooling tower 3 upper inlet are connected with gasification cooling flue 2 the other ends, and its underpart outlet is connected with gas line 4;
Spark Annihilator 5 is cylindrical structures, and inside is provided with eddy flow baffle plate, can extinguish the residual Mars in the flue gas.Spark Annihilator 5 is located between wet cooling tower 3 and the gas valve 6, and its import and export links to each other with wet cooling tower 3 outlets, gas valve 6 imports respectively by gas line 4 respectively;
Gas valve 6 is provided with valve plate, can cut off the flue gas path or regulate flue gas flow.Gas valve 6 is located between Spark Annihilator 5 and the sack cleaner 7, and its import and export links to each other with Spark Annihilator 5 outlets, sack cleaner 7 imports respectively by gas line 4;
Sack cleaner 7 is cylindrical structures.Sack cleaner 7 is arranged between gas valve 6 and the gas fan 8, and its underpart import, top outlet link to each other with gas valve 6 outlets, gas fan 8 imports respectively by gas line 4;
The mobile power that provides of system's flue gas is provided gas fan 8.Gas fan 8 is arranged between sack cleaner 7 and the sourdine 9, and its import, outlet link to each other with sack cleaner 7 outlets, sourdine 9 imports respectively by gas line 4;
Sourdine 9 mainly is to reduce operational noise of system, satisfies the requirement of environment to noise.Sourdine 9 is arranged between gas fan 8 and the three-way switch valve 10, and its import, outlet link to each other with gas fan 8 outlets, three-way switch valve 10 imports respectively by gas line 4;
Three-way switch valve 10 switches between reclaiming and diffusing according to gas composition.Three-way switch valve 10 is arranged in sourdine 9 and diffuses between chimney 11, the gas chamber, and its import links to each other with sourdine 9 outlets by gas line 4, and its outlet links to each other with the gas chamber that diffuses chimney 11 imports, downstream by gas line 4 respectively;
Diffusing chimney 11 is cylindrical structures.Diffuse chimney 7 lower inlet and link to each other by gas line 4, diffuse chimney 11 top venting ports and be communicated with atmosphere with three-way switch valve 10 outlets of upstream;
Gas line 4 is cylindrical structures.Be arranged in wet cooling tower 3, Spark Annihilator 5, gas valve 6, sack cleaner 7, gas fan 8, sourdine 9, three-way switch valve 10, diffuse between chimney 11, the gas chamber, and be connected with these equipment.
Oxygen-insulating type converter coal gas dry-method bag-type cleaning and recovering process workflow of the present invention is as follows:
1. burning phase and the back flue gas that produces between the phase of burning before converter, O
2Content＜2% can directly enter the converter coal gas purification recovery system.High-temperature flue gas at first enters gasification cooling flue 2 and cools off indirectly, enters directly water spray cooling of wet cooling tower 3 subsequently, and cooled temperature is controlled at below 260 ℃.Cooled smoke successively by gas line 4, Spark Annihilator 5, gas valve 6, enters sack cleaner 7 then and carries out dedusting, and the flue gas concentration after the dedusting≤10mg/ marks m
3Flue gas after the dedusting is sent into three-way switch valve 10 by gas fan 8 through behind the sourdine 9.Switching valve 10 reclaims and diffuses switching according to gas content, the gas content higher position switches to reclaims shelves and enter gas chamber by gas line 4 and reclaim; Gas content is low just to be switched to and diffuses shelves and enter by gas line 4 and diffuse chimney 11 and diffuse.
2., tapping reinforced and the flue gas that produces other periods in converter, O
2Content 〉=2% just can not enter the converter coal gas purification recovery system.At this moment close gas valve 6, turn down gas fan 8 rotating speeds, gas fume after burning can only be extracted out by the smoke outlet that is arranged on the converter enclosed hood, by converter secondary flue gas dust-removal system dedusting back up to standard discharging.
Will regularly carry out deashing to dust-removal system equipment, the flue dust behind the deashing will regularly be discharged.
Certainly, those skilled in the art in the present technique field will be appreciated that, the foregoing description only is to be used for illustrating the present invention, and be not as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claim of the present invention conversion, the modification of the foregoing description.
Claims (3)
1. an oxygen-insulating type converter coal gas dry-method bag-type cleaning and recovering process is characterized in that controlling the smoke components that enters sack cleaner, does not allow to contain O
2The flue gas that amount surpasses limits of explosion enters sack cleaner.
2. oxygen-insulating type converter coal gas dry-method bag-type cleaning and recovering process according to claim 1 is characterized in that:
The flue gas that burning phase and back burning produced between the phase before converter, O
2Content＜2% can directly enter the converter coal gas purification recovery system.High-temperature flue gas at first enters gasification cooling flue 2 and cools off indirectly, enters directly water spray cooling of wet cooling tower 3 subsequently.Cooled smoke successively by gas line 4, Spark Annihilator 5, gas valve 6, enters sack cleaner 7 then and carries out dedusting, and the flue gas after dedusting is up to standard is sent into three-way switch valve 10 by gas fan 8 through behind the sourdine 9.Switching valve 10 reclaims and diffuses switching according to gas content, the gas content higher position switches to reclaims shelves and enter gas chamber by gas line 4 and reclaim; Gas content is low just to be switched to and diffuses shelves and enter by gas line 4 and diffuse chimney 11 and diffuse;
, tapping reinforced and the flue gas that produces other periods in converter, O
2Content 〉=2% just can not enter the converter coal gas purification recovery system.At this moment close gas valve 6, turn down gas fan 8 rotating speeds, gas fume after burning can only be extracted out by the smoke outlet that is arranged on the converter enclosed hood, by converter secondary flue gas dust-removal system dedusting back up to standard discharging.
3. an oxygen-insulating type converter coal gas dry-method bag-type cleaning and recovering process is characterized in that it comprises converter 1, gasification cooling flue 2, wet cooling tower 3, gas line 4, gas fan 8, sourdine 9, three-way switch valve 10, diffuses chimney 11; Its feature is that also it also comprises Spark Annihilator 5, gas valve 6, sack cleaner 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010176278 CN101851695A (en) | 2010-05-17 | 2010-05-17 | Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010176278 CN101851695A (en) | 2010-05-17 | 2010-05-17 | Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter |
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| CN101851695A true CN101851695A (en) | 2010-10-06 |
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| CN 201010176278 Pending CN101851695A (en) | 2010-05-17 | 2010-05-17 | Dry bag-type coal gas purifying and recycling process for oxygen-resistant converter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102212644A (en) * | 2011-05-09 | 2011-10-12 | 尹华勤 | Converter gas cloth-bag purifying and recycling technology combining cooling extingiushment and heating dust removal |
| WO2013011089A1 (en) * | 2011-07-21 | 2013-01-24 | Siemens Vai Metals Technologies Gmbh | Method and device for the dust removal and cooling of converter gas |
| CN104399347A (en) * | 2014-11-29 | 2015-03-11 | 无锡市南长区科技创业服务中心 | Explosion-proof smoke treatment device for boiler |
| CN108265152A (en) * | 2016-12-30 | 2018-07-10 | 北京凯德恒源科技发展有限公司 | Pneumatic steelmaking coal gas complete recovering technique and its control method based on nitrogen compensation |
| 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 |
| CN113082880A (en) * | 2021-04-23 | 2021-07-09 | 日照钢铁控股集团有限公司 | Offline installation and butt joint method for primary dust removal metal filter bag dust remover of converter |
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| JP3500578B2 (en) * | 2001-03-07 | 2004-02-23 | 川崎重工業株式会社 | Converter exhaust gas dust separation equipment |
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| JP3500578B2 (en) * | 2001-03-07 | 2004-02-23 | 川崎重工業株式会社 | Converter exhaust gas dust separation equipment |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102021264B (en) * | 2010-12-03 | 2012-11-28 | 宁波大学 | Dust-removal and waste heat recovery system of steelmaking converter gas and recovery method of dust-removal |
| CN102212644A (en) * | 2011-05-09 | 2011-10-12 | 尹华勤 | Converter gas cloth-bag purifying and recycling technology combining cooling extingiushment and heating dust removal |
| WO2013011089A1 (en) * | 2011-07-21 | 2013-01-24 | Siemens Vai Metals Technologies Gmbh | Method and device for the dust removal and cooling of converter gas |
| CN104399347A (en) * | 2014-11-29 | 2015-03-11 | 无锡市南长区科技创业服务中心 | Explosion-proof smoke treatment device for boiler |
| CN108265152A (en) * | 2016-12-30 | 2018-07-10 | 北京凯德恒源科技发展有限公司 | Pneumatic steelmaking coal gas complete recovering technique and its control method based on nitrogen compensation |
| 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 |
| CN113082880A (en) * | 2021-04-23 | 2021-07-09 | 日照钢铁控股集团有限公司 | Offline installation and butt joint method for primary dust removal metal filter bag dust remover of converter |
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Application publication date: 20101006 |