CN105132615A - All-dry method converter gas purification recovery technology - Google Patents
All-dry method converter gas purification recovery technology Download PDFInfo
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- CN105132615A CN105132615A CN201510659661.XA CN201510659661A CN105132615A CN 105132615 A CN105132615 A CN 105132615A CN 201510659661 A CN201510659661 A CN 201510659661A CN 105132615 A CN105132615 A CN 105132615A
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to an all-dry method converter gas purification recovery technology. By means of the cold and clean gas dilution effect, converter gas with the temperature of 900-1000 DEG C and cold and clean converter gas from a gasometer are rapidly mixed and cooled to reach the temperature of 600 DEG C, and mixed gas with the temperature of 600 DEG C is formed; then, a heat pipe exchanger is utilized for recycling intermediate and low temperature exhaust heat in the converter gas, the mixed gas is cooled to reach the temperature of 200-250 DEG C, and dust removal is performed to obtain clean gas. The converter gas waste heat can be recycled to the largest extent, the steel melting cost is lowered, no water resources are consumed, and the sewage disposal cost is saved; the accidents that a steam cooler accumulates dust seriously, the service life of a spraying gun of the steam cooler is short, wet dust is likely to be accumulated on an electrostatic dust collector and polar lines are bound are fundamentally eradicated; nitrogen atomization cooling water is not needed, the nitrogen content in the converter gas is lowered, and the CO content is improved.
Description
Technical field
The present invention relates to converter gas purification and recovery process, specifically a kind ofly utilize calm coal gas diluting effect that 900 DEG C of-1000 DEG C of coal gas of converter are cooled to rapidly 600 DEG C, and then utilize that heat-pipe heat exchanger reclaims in coal gas of converter, the full-dry method converter gas purification and recovery process of low temperature exhaust heat.
Background technology
Converter coal gas purification recovery technology reduces steel making working procedure production cost, the negative basic technology that can make steel of realization.At present, converter coal gas purification recovery technology comprises wet purification and reclaims (OG method) and semidrying Recovery Purifying two kinds of technology, and two kinds of technology all exist certain defect.
(1) defect that (OG method) technique exists is reclaimed in wet purification: the coal gas of converter cooling institute liberated heat of more than 900 DEG C all absorbs by water, and dedusting method is wet dedusting, and water loss is very high; The sensible heat of less than 900 DEG C coal gas of converter is all wasted, and waste heat recovery efficiency is very low.
(2) defect of semidrying cleaning and recovering process existence: evaporative cooler needs to be atomized cooling water, because the atomizing effect of evaporative cooler to water has high requirements, so evaporative cooler adopts nitrogen as the propellant of water coolant, ton steel nitrogen consumption is up to 25Nm
3, nitrogen consumption is high; Evaporative cooler is due to the steel-making of converter employing Wingdale, calcium oxide is produced after the inner decomposes of converter, calcium oxide easily absorbs moisture in evaporative cooler inside, be easy to be bonded on the barrel of evaporative cooler, cause the internal junction ash of evaporative cooler serious, need regular deashing (a general week needs deashing once); The spray gun of evaporative cooler needs regular replacing, within general about 8 months, needs to change spray gun once.Because long meeting duration of service causes the explosion of spray gun, so need periodic replacement; Containing a large amount of water vapour in flue, dust is easily bonded on pole plate polar curve, and then affects the dust removing effects of electrostatic precipitator; The concentration that the method for nitrogen atomization that uses evaporative cooler can reduce CO (reduces about 8%; The sensible heat of less than 900 DEG C coal gas of converter is all wasted, and the converter gas sensible heat rate of recovery is very low.
To sum up, semidrying cleaning and recovering process is compared with wet processing, although saved a large amount of water resourcess, nitrogen consumption is higher, and evaporative cooler, electrostatic precipitator operation stability are poor, and the converter gas sensible heat rate of recovery is all very low.
Summary of the invention
Object of the present invention is intended to solve the defect that known coal gas of converter semidrying cleaning and recovering process and wet purification recovery process exist, thering is provided a kind of utilizes calm coal gas diluting effect that 900 DEG C of-1000 DEG C of coal gas of converter are cooled to rapidly 600 DEG C, and then utilizes heat-pipe heat exchanger to reclaim the full-dry method converter coal gas purification recovery system of coal gas of converter middle-low temperature heat.
The present invention solves its technical problem, and the technical scheme of employing is:
A kind of full-dry method converter gas purification and recovery process, carries out in the steps below:
(1) coal gas of converter is lowered the temperature in watercooled hood: first coal gas of converter enters watercooled hood by converter and be cooled to 900 DEG C-1000 DEG C;
(2) high temperature coal gas of converter one-time dedusting: 900 DEG C-1000 DEG C high temperature coal gas of converter enter high temperature cyclone separator and carry out one-time dedusting, is separated the particle of particle diameter more than 50 microns in coal gas of converter;
(3) high temperature one-time dedusting coal gas of converter chilling: the high temperature one-time dedusting coal gas of converter after one-time dedusting enters eddy flow mixing section, mixes rapidly with the cold clean coal gas of converter from gas chamber and is cooled to about 600 DEG C, forms the mixed gas of about 600 DEG C; In mixing process, high temperature one-time dedusting coal gas of converter is cooled to about 600 DEG C to the cold clean coal gas of converter heat release from gas chamber by 900 DEG C-1000 DEG C, cold clean coal gas of converter from gas chamber absorbs heat and is warming up to about 600 DEG C from high temperature one-time dedusting coal gas of converter, and high temperature one-time dedusting coal gas of converter chilling cooling liberated heat near kindling temperature is accumulated in the cold clean coal gas of converter from gas chamber;
The mixed gas waste heat recovery of (4) 600 DEG C: the mixed gas of 600 DEG C enters rapidly the lower low wall temperature heat-pipe heat exchanger of Temperature of Working, and the mixed gas of 600 DEG C is cooled to 450 DEG C, and low wall temperature hot tube heat exchanger is by the dust fast cooling in flue gas;
The mixed gas of 450 DEG C enters high wall temperature hot tube heat exchanger, and the mixed gas of 450 DEG C is cooled to 200 DEG C--and 250 DEG C;
(5) 200 DEG C--250 DEG C of mixed gas essences dedustings: 200 DEG C--250 DEG C of mixed gases enter electrostatic precipitator and carry out smart dedusting, obtain purified gas;
(6) purified gas is lowered the temperature and is entered cabinet: purified gas is cooled to the temperature condition into gas holder at water cooler, and diffuses according to the gas holder condition judgment of oxygen and carbon monoxide or enter gas holder.
Adopt the present invention of technique scheme, compared with prior art, by utilizing the method for calm coal gas diluting effect rapid cooling, the mode that wet method is lowered the temperature rapidly is substituted in coal gas of converter kindling temperature region, calm coal gas of converter is given by the sensible heat transfer of high temperature coal gas of converter in temperature-fall period, it is made to be warming up to 600 DEG C, and then utilize heat-pipe heat exchanger that this partial heat is recovered to 200 DEG C together with new coal gas waste heat, thus reach the object farthest reclaiming afterheat of converter gas, reduce steel-making cost, its beneficial effect is summarized as follows:
1. great lot of water resources is saved.Compared with wet purification recovery process, the present invention does not consume any water resources, has saved a large amount of water resourcess, has saved the expense of large amount of sewage process simultaneously.The water consumption per ton steel amount of wet purification recovery process is up to about 25 tons.
2. waste heat recovery rate is high.Compare with wet purification recovery process with coal gas semidrying cleaning and recovering process, the present invention has increased substantially the organic efficiency of converter gas sensible heat, coal gas semidrying cleaning and recovering process and wet purification recovery process have all only reclaimed the converter gas sensible heat of more than 900 DEG C, and the present invention has reclaimed the converter gas sensible heat of more than 200 DEG C, the rate of recovery has improved 117%.
3. casualty ratio of accidents is low.Owing to the invention belongs to full-dry method technique, compared with coal gas semidrying cleaning and recovering process, the present invention has stopped from root the generation that evaporative cooler dust stratification is serious, the service life of lance of evaporative cooler is short, electrostatic precipitator easily amasss the accidents such as wet ash bonding polar curve, and casualty ratio of accidents significantly reduces.
4. coal gas of converter quality improves.Because the present invention does not need nitrogen atomization cooling water, compared with coal gas semidrying cleaning and recovering process, in coal gas of converter, a nitrogen content reduces, and CO content improves about 8%.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention;
In figure: 1-converter; 2-gasification cooling flue; 3-water seal slag remover; 4-water seal control of dust pond; 5-sealed expansion joint; 6-high temperature cyclone separator; 7-cools down coal gas swirler; 8-bluff body; The low wall temperature hot tube heat exchanger (economizer) of 9-; 10-height wall temperature hot tube heat exchanger (vaporizer); The electronic shutdown valve of 11-; 12-switching station; 13-electrostatic precipitator; 14-aerofoil fan; 15-sound damper; 16-diffusing chimney; 17-gas cooler; 18-coal gas of converter mixing quench chamber.
Specific embodiment
Below in conjunction with embodiment, the present invention is further elaborated, but the present embodiment does not form any restriction to the present invention.
See Fig. 1, the full-dry method converter gas purification and recovery process that the present embodiment provides, its technical process is as follows:
(1) molten iron blows in converter 1, and first coal gas of converter is cooled between 900 DEG C-1000 DEG C through gasification cooling flue 2, then enters high temperature cyclone separator 6 and carries out one-time dedusting, is separated the particle of more than 50 microns of the overwhelming majority in coal gas of converter.
High temperature cyclone separator 6 internal layer adopts high temperature resistant, wear-resisting refractory materials, centre is thermal insulation material, outermost layer is weld tight iron plate housing, be connected by sealed expansion joint 5 between high temperature cyclone separator 6 with gasification cooling flue 2, the dust that high temperature cyclone separator 6 separates falls into water seal control of dust pond 4 by ash tube, is then pulled out by water seal slag remover 3.
(2) the high temperature one-time dedusting coal gas of converter through high temperature cyclone separator 6 one-time dedusting enters coal gas of converter mixing quench chamber 18, mix rapidly with the calm coal gas of converter from gas cooler 17 rear portion and quick instantaneous temperature reduction to 600 DEG C, form the chilling coal gas of converter of about 600 DEG C.
In order to strengthen the mixing velocity of high temperature one-time dedusting coal gas of converter and calm coal gas of converter, when calm coal gas of converter enters coal gas of converter mixing quench chamber 18, rotating jet is formed through the calm coal gas swirler 7 with axial torsion blade, to improve the axial relative speed of two strands of jets, and high temperature one-time dedusting coal gas of converter is when entering coal gas of converter mixing quench chamber 18, by bluff body 8 shunting action and the certain angle of cut of calm coal gas of converter fluidic vectoring thrust.
When in high temperature cyclone separator 6, oxygen level exceeds standard, calm coal gas of converter will switch to datonation-inhibition pattern by electronic shutdown valve 11, the electronic trip valve of the switching station 12 of cold purified gas side cuts out, the electronic trip valve of the switching station 12 of low-pressure steam side is opened, and the alternative calm coal gas of converter of low-pressure steam is to high temperature one-time dedusting coal gas of converter chilling and inert diluents is datonation-inhibition.
(3) chilling coal gas of converter enters low wall temperature hot tube heat exchanger (economizer) 9 and carries out heat release, and be cooled to about 450 DEG C, form a convection heat transfer coal gas of converter, the tube wall that the thin ash in chilling coal gas of converter runs into low temperature is lowered the temperature rapidly; A convection heat transfer coal gas of converter enters high wall temperature hot tube heat exchanger (vaporizer) 10 and carries out heat release, is cooled between 200 DEG C-250 DEG C, forms secondary convection heat transfer coal gas of converter.
(4) secondary convection heat transfer coal gas of converter enters electrostatic precipitator 13 dedusting, form electrostatic precipitation coal gas of converter, electrostatic precipitation coal gas of converter pressurizes through aerofoil fan 14, switching station 12 is entered again through sound damper 15, switch to the pattern of diffusing when gas composition is defective, coal gas of converter diffuses after diffusing chimney 16 is lighted; Switch to take-back model when gas composition is qualified, electronic shutdown valve 11 is opened, and coal gas of converter enters gas holder through gas cooler 17 and enters coal gas of converter mixing quench chamber 18 as quenching medium.
So far, full-dry method converter gas purification and recovery process flow process terminates.
The foregoing is only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention, the equivalence change that all utilizations description of the present invention is done, be all contained within interest field of the present invention.
Claims (1)
1. a full-dry method converter gas purification and recovery process, is characterized in that, carries out in the steps below:
(1) coal gas of converter is lowered the temperature in watercooled hood: first coal gas of converter enters watercooled hood by converter and be cooled to 900 DEG C-1000 DEG C;
(2) high temperature coal gas of converter one-time dedusting: 900 DEG C-1000 DEG C high temperature coal gas of converter enter high temperature cyclone separator and carry out one-time dedusting, is separated the particle of particle diameter more than 50 microns in coal gas of converter;
(3) high temperature one-time dedusting coal gas of converter chilling: the high temperature one-time dedusting coal gas of converter after one-time dedusting enters eddy flow mixing section, mixes rapidly with the cold clean coal gas of converter from gas chamber and is cooled to about 600 DEG C, forms the mixed gas of about 600 DEG C; In mixing process, high temperature one-time dedusting coal gas of converter is cooled to about 600 DEG C to the cold clean coal gas of converter heat release from gas chamber by 900 DEG C-1000 DEG C, cold clean coal gas of converter from gas chamber absorbs heat and is warming up to about 600 DEG C from high temperature one-time dedusting coal gas of converter, and high temperature one-time dedusting coal gas of converter chilling cooling liberated heat near kindling temperature is accumulated in the cold clean coal gas of converter from gas chamber;
The mixed gas waste heat recovery of (4) 600 DEG C: the mixed gas of 600 DEG C enters rapidly the lower low wall temperature heat-pipe heat exchanger of Temperature of Working, and the mixed gas of 600 DEG C is cooled to 450 DEG C, and low wall temperature hot tube heat exchanger is by the dust fast cooling in flue gas;
The mixed gas of 450 DEG C enters high wall temperature hot tube heat exchanger, and the mixed gas of 450 DEG C is cooled to 200 DEG C--and 250 DEG C;
(5) 200 DEG C--250 DEG C of mixed gas essences dedustings: 200 DEG C--250 DEG C of mixed gases enter electrostatic precipitator and carry out smart dedusting, obtain purified gas;
(6) purified gas is lowered the temperature and is entered cabinet: purified gas is cooled to the temperature condition into gas holder at water cooler, and diffuses according to the gas holder condition judgment of oxygen and carbon monoxide or enter gas holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510659661.XA CN105132615B (en) | 2015-10-14 | 2015-10-14 | Full-dry method converter gas purification and recovery process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510659661.XA CN105132615B (en) | 2015-10-14 | 2015-10-14 | Full-dry method converter gas purification and recovery process |
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| CN105132615A true CN105132615A (en) | 2015-12-09 |
| CN105132615B CN105132615B (en) | 2017-03-08 |
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| CN201510659661.XA Expired - Fee Related CN105132615B (en) | 2015-10-14 | 2015-10-14 | Full-dry method converter gas purification and recovery process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684878A (en) * | 2019-09-24 | 2020-01-14 | 北京博鹏北科科技有限公司 | System and novel process for recycling waste heat generated by purifying high-temperature coal gas in HIsmelt smelting reduction furnace by dry method instead of wet method |
| CN110684877A (en) * | 2019-09-24 | 2020-01-14 | 北京博鹏北科科技有限公司 | Dry-method purification waste heat recovery system and new process for high-temperature coal gas of HIsmelt smelting reduction furnace |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962884A (en) * | 2006-12-07 | 2007-05-16 | 昆明阳光数字技术股份有限公司 | Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas |
| CN201386112Y (en) * | 2009-03-03 | 2010-01-20 | 袁长胜 | Converter gas full-dry method purifying and residual heat utilizing equipment |
| CN101671757A (en) * | 2009-10-14 | 2010-03-17 | 中冶赛迪工程技术股份有限公司 | Converter coal gas dry-method bag-type dust collecting and waste heat recovery method |
| CN104388627A (en) * | 2014-11-20 | 2015-03-04 | 中冶南方工程技术有限公司 | Dust removing method for coal gas of converter and system |
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2015
- 2015-10-14 CN CN201510659661.XA patent/CN105132615B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962884A (en) * | 2006-12-07 | 2007-05-16 | 昆明阳光数字技术股份有限公司 | Dry-method dust collection and surplus energy recovery device for steel-smelting converter flue gas |
| CN201386112Y (en) * | 2009-03-03 | 2010-01-20 | 袁长胜 | Converter gas full-dry method purifying and residual heat utilizing equipment |
| CN101671757A (en) * | 2009-10-14 | 2010-03-17 | 中冶赛迪工程技术股份有限公司 | Converter coal gas dry-method bag-type dust collecting and waste heat recovery method |
| CN104388627A (en) * | 2014-11-20 | 2015-03-04 | 中冶南方工程技术有限公司 | Dust removing method for coal gas of converter and system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110684878A (en) * | 2019-09-24 | 2020-01-14 | 北京博鹏北科科技有限公司 | System and novel process for recycling waste heat generated by purifying high-temperature coal gas in HIsmelt smelting reduction furnace by dry method instead of wet method |
| CN110684877A (en) * | 2019-09-24 | 2020-01-14 | 北京博鹏北科科技有限公司 | Dry-method purification waste heat recovery system and new process for high-temperature coal gas of HIsmelt smelting reduction furnace |
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| CN105132615B (en) | 2017-03-08 |
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Inventor after: Wang Zibing Inventor after: Wang Xindong Inventor after: Yang Xiaoxiao Inventor after: Zhao Shen Inventor after: Qi Lijun Inventor after: Chang Jian Inventor after: Xing Hongwei Inventor after: Zhang Yuzhu Inventor after: Hu Changqing Inventor after: Kang Running Inventor after: Wang Chao Inventor after: Wang Yizhu Inventor after: Yu Yong Inventor before: Wang Zibing Inventor before: Chang Jian Inventor before: Huang Bo Inventor before: Qin Wankuo Inventor before: Qi Lijun Inventor before: Hu Changqing Inventor before: Xing Hongwei Inventor before: Wang Yizhu Inventor before: Yu Yong Inventor before: Wang Xindong Inventor before: Yang Xiaoxiao Inventor before: Zhao Shen Inventor before: Wang Chao |
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Granted publication date: 20170308 Termination date: 20181014 |