CN105063272A - Novel two-stage type converter gas waste heat recovery system - Google Patents

Novel two-stage type converter gas waste heat recovery system Download PDF

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Publication number
CN105063272A
CN105063272A CN201510422673.0A CN201510422673A CN105063272A CN 105063272 A CN105063272 A CN 105063272A CN 201510422673 A CN201510422673 A CN 201510422673A CN 105063272 A CN105063272 A CN 105063272A
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converter
gas
drum
afterheat
novel
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CN201510422673.0A
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CN105063272B (en
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惠建明
郁鸿凌
惠文博
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WUXI YIEN TECHNOLOGY Co Ltd
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WUXI YIEN TECHNOLOGY Co Ltd
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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 discloses a novel two-stage type converter gas waste heat recovery system. The novel two-stage type converter gas waste heat recovery system sequentially comprises a converter (1), a converter flue (2), a high-temperature cyclone separator (3), a fire tube type natural circulation converter gas waste heat boiler (6) and a gas dust removal purification device (7) which are connected. The gas dust removal purification device (7) is connected with a converter gas storage cabinet (9) and a vent stack (10). After gas generated by the converter (1) is subjected to evaporation cooling through the converter flue (2), the temperature is decreased to 800-1000 DEG C from 1400-1600 DEG C; then, the gas enters the high-temperature cyclone separator (3), so that more than 50% of coarse-particle dust in the gas are separated out; afterwards, the gas enters the fire tube type natural circulation converter gas waste heat boiler (6). Through the novel two-stage type converter gas waste heat recovery system, waste heat can be recovered under the condition that zero leakage of smoke is guaranteed, and meanwhile wastewater treatment cost caused in the later period can be reduced.

Description

Novel two-section type afterheat of converter gas recovery system
Technical field
The present invention relates to coal gas waste heat recovery and purification techniques field in converter steelmaking, especially relate to a kind of novel two-section type afterheat of converter gas recovery system.
Background technology
China has the total output of steel of about 70% to adopt Bof technique, the recovery and utilization technology of coal gas of converter and environmental protection and energy-conservation closely related.Producing byproduct in Bof is 1400-1600 DEG C of coal gas of converter, and its energy matter is coal gas of high temperature sensible heat and calorific value is 7000 ~ 8000KJ/Nm 3chemical energy (CO).In order to improve energy recovery rate and reduce environmental pollution, in the industry of home and abroad, adopt " OG " wet dust removal purifying method and " LT " dry type static dust purifying method to RECOVERY OF CONVERTER GAS purification is general.Compare to the efficiency of dust collection of coal gas of converter, " LT " method dust-removal system efficiency of dust collection is high, and coal gas of converter dustiness can be down to about 10mg/m 3, when utilizing further, directly can be sent to user's point; And its dustiness of the coal gas of converter of OG system recoveries is at 50 ~ 150mg/m 3.
Because " OG " wet dust removal cleaning process technology is more ripe, " OG " wet dust removal purifying method is generally adopted in Iron and Steel Enterprises in China, its current technical process be 1400-1600 DEG C coal gas after gasification cooling flue, after gas temperature is down to 800-1000 DEG C, enter the overflow of one-level water and fix Venturi meter, sharply cool to less than 70 DEG C, divide into water trap, then the adjustable Venturi meter of secondary is entered, dust in flue gas mainly here removes, and then enters blower fan system through the elbow separator of 90 degree and tower water trap and delivers to user or diffusing tower.The main shortcoming of the method is, technical process is complicated, and resistance to flow is large, and after spray desuperheating and dedusting, heat recuperation rate is low, and coal gas of converter wastewater treatment difficulty, wet dust removal efficiency is low.This method causes heats a large amount of in converter gas to be utilized, both wasted the energy, added the consumption of water or steam, and created again a large amount of trade effluents, thus add the cost of wastewater treatment, and water ratio is high in coal gas, cause heavy wear and the corrosion of draught fan impeller.Dust iron powder substantially in coal gas, improving dust removal efficiency is also reclaim Mineral resources, reduces topsoil.
Containing O in coal gas of converter 2, CO and CO 2deng gas, very easily explode and make people poisoning, bringing serious threat to safety in production.As O in coal gas 2more than 2%, processing requirement coal gas should diffuse, and can not reclaim, and more can not enter electric dust removing system.So " LT " dry type static dust purifying method is better than " OG " method to gas purification treatment effect, but require very high to security of system.
Summary of the invention
The present invention is in order to solve the difficult problem in converter current coal-gas recovering process, improve the heat energy recovery rate of coal gas of converter, for herein is provided a kind of novel two-section type afterheat of converter gas recovery system, comprise the converter 1 of connection successively, converter flue 2, fire-tube type natural circulation afterheat of converter gas boiler 6, coal gas dust removal refining plant 7, described coal gas dust removal refining plant 7 stores up cabinet 9 with coal gas of converter and diffusing chimney 10 is connected, the coal gas that converter 1 produces is after converter flue 2 Vaporizing cooling, temperature is down to 800-1000 DEG C by 1400-1600 DEG C, enter fire-tube type natural circulation afterheat of converter gas boiler 6 again.
The present invention's novel two-section type afterheat of converter gas recovery system, between converter flue 2 and fire-tube type natural circulation afterheat of converter gas boiler 6, be connected with a high temperature cyclone separator 3, high temperature cyclone separator 3 isolates the crude particle dust of in coal gas more than 50%.
The present invention's novel two-section type afterheat of converter gas recovery system, also comprise gas cleaning device 11, a high temperature tee joint switching valve 4 is connected with between high temperature cyclone separator 3 and fire-tube type natural circulation afterheat of converter gas boiler 6, high temperature tee joint switching valve 4, gas cleaning device 11 are connected successively with coal gas of converter storage cabinet 9, formation process bypass.
The present invention's novel two-section type afterheat of converter gas recovery system, described coal gas dust removal refining plant 7 stores up cabinet 9 with coal gas of converter respectively by the first three-way switch valve 8 and diffusing chimney 10 is connected.
The present invention's novel two-section type afterheat of converter gas recovery system, is connected with the second three-way switch valve 12, second three-way switch valve 12 and is also connected with diffusing chimney 10 between high temperature tee joint switching valve 4 and gas cleaning device 11.
The present invention's novel two-section type afterheat of converter gas recovery system, described fire-tube type natural circulation afterheat of converter gas boiler 6 comprises upper drum and lower drum, on, be communicated with downtake by upcast between lower drum, the two ends of described lower drum are respectively equipped with a smoke-box 5, straight-through flue tube bank is furnished with in lower drum between two smoke-boxes 5, coal gas passes through in flue tube bank, water is filled with in lower drum outside flue tube bank, coal gas in flue tube bank carries out heat exchange with the water outside tube bank in flow process, produce saturation steam and enter upper drum from upcast, water in upper drum adds in lower drum from downtake, form a natural circulation carbonated drink loop.Because coal gas heat exchange pipeline is immersed in drum in water, just in case pipeline is by seepage, also operating safety can be guaranteed.
The present invention's novel two-section type afterheat of converter gas recovery system, described smoke-box 5, primarily of tube sheet and drum end socket composition, is also provided with ash discharge mechanism in the bottom of smoke-box 5, and flue tube bank is arranged between two tube sheets.
Coal gas of converter is after converter flue Vaporizing cooling, temperature is down to 800-1000 DEG C by 1400-1600 DEG C, enter high temperature cyclone separator, isolate more than 50% crude particle dust in coal gas, the gas speed entering waste heat boiler 6 can be improved, enhance gas-liquid heat transfer effect, meanwhile, decrease solid particulate matter in coal gas to the heating surface wear of waste heat boiler, be reduced in knot ash in fire tube.Then enter fire-tube type natural circulation afterheat of converter gas boiler, produce saturation steam.Steam enters the air space of upper drum along upcast, by steam separator in cylinder, enters gas pipeline and is supplied to user.Water in upper drum flows in lower drum along downtake, forms a natural circulation carbonated drink loop with lower drum.Coal gas of converter is after again lowering the temperature, and now, gas temperature is less than 250 DEG C, can adopt the fiber bag precipitator that cost performance is higher.
Between high temperature cyclone separator 3 and fire-tube type natural circulation afterheat of converter gas boiler 6, be provided with high temperature tee joint switching valve 4, for switching between flue collector and technique bypass flue, be convenient to the boiler time-based maintenance of fire-tube type natural circulation afterheat of converter gas and breakdown maintenance.
The coal gas being less than 250 DEG C by fire-tube type natural circulation afterheat of converter gas boiler temperature out, enter fiber bag precipitator, further udst separation, coal gas dust content rate is less than 30mg/Nm 3, reach national requirements for environmental protection.
Be provided with first three-way switch valve after sack cleaner, its Main Function be coal gas from sack cleaner out after, according to coal-gas recovering processing requirement, in coal gas, the levels of CO meets processing requirement, coal gas enters coal gas of converter hold-up vessel, otherwise T-valve switches to emptying bypass.
The invention has the beneficial effects as follows:
1, in the present invention coal gas after Vaporizing cooling converter flue, high temperature cyclone separator is adopted to carry out first time dust removal process, the dust removing about 50% of iron powder will be mainly in coal gas, greatly reduce containing grey rate, favourable condition is created for coal gas heat reclaims further, the flow of gas speed in waste heat boiler can be improved, both heat transfer effect between gas-liquid had been enhanced, prevent again coal gas from entering fire-tube type natural circulation afterheat of converter gas boiler and produce knot ash and wear phenomenon, improve waste heat boiler heat-transfer effect and safety in operation.
2, because the gas line in waste heat boiler is restrained for straight-through and be immersed in drum in water, restrain as straight tube, dead angle of not turning, avoid knot ash in pipe and affect heat-transfer effect; In addition, be circulation coal gas in pipe, if pipeline has Seepage, because tube bank is immersed in water, also can guarantee environmental safety.
3, in the present invention, coal gas adopts secondary dry gas cleaning, both reduce water ratio in coal gas, additionally reduced coal gas of converter sewage generation, adopt two-section type waste heat reclaiming process simultaneously, improve the gas heat rate of recovery, the caloric power of gas reclaimed also is significantly increased with amount.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is schematic diagram of the present invention.
Embodiment
All features disclosed in this specification sheets, or the step in disclosed all methods or process, except mutually exclusive feature and/or step, all can combine by any way.
Arbitrary feature disclosed in this specification sheets, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
Novel two-section type afterheat of converter gas recovery system as shown in Figure 1, comprise the converter 1 of connection, converter flue 2, high temperature cyclone separator 3, fire-tube type natural circulation afterheat of converter gas boiler 6, coal gas dust removal refining plant 7 successively, described coal gas dust removal refining plant 7 stores up cabinet 9 with coal gas of converter respectively by the first three-way switch valve 8 and diffusing chimney 10 is connected.Also comprise gas cleaning device 11, a high temperature tee joint switching valve 4 is connected with between high temperature cyclone separator 3 and fire-tube type natural circulation afterheat of converter gas boiler 6, high temperature tee joint switching valve 4, gas cleaning device 11 are connected successively with coal gas of converter storage cabinet 9, formation process bypass.Between high temperature tee joint switching valve 4 and gas cleaning device 11, be connected with the second three-way switch valve 12, second three-way switch valve 12 be also connected with diffusing chimney 10.
Wherein, described fire-tube type natural circulation afterheat of converter gas boiler 6 comprises upper drum and lower drum, on, be communicated with downtake by upcast between lower drum, the two ends of described lower drum are respectively equipped with a smoke-box 5, described smoke-box 5 is primarily of tube sheet and drum end socket composition, ash discharge mechanism is also provided with in the bottom of smoke-box 5, straight-through flue tube bank is furnished with in lower drum between two tube sheets, coal gas passes through in flue tube bank, water is filled with in lower drum outside flue tube bank, coal gas in flue tube bank carries out heat exchange with the water outside tube bank in flow process, produce saturation steam and enter upper drum from upcast, water in upper drum adds in lower drum from downtake, form a natural circulation carbonated drink loop.Because coal gas heat exchange pipeline is immersed in drum in water, just in case pipeline is by seepage, also operating safety can be guaranteed.
Coal gas of converter is after converter flue Vaporizing cooling, temperature is down to 800-1000 DEG C by 1400-1600 DEG C, enter high temperature cyclone separator, isolate more than 50% crude particle dust in coal gas, the gas speed entering waste heat boiler 6 can be improved, enhance gas-liquid heat transfer effect, meanwhile, decrease solid particulate matter in coal gas to the heating surface wear of waste heat boiler, be reduced in knot ash in fire tube.Then enter fire-tube type natural circulation afterheat of converter gas boiler, produce saturation steam.Steam enters the air space of upper drum along upcast, by steam separator in cylinder, enters gas pipeline and is supplied to user.Water in upper drum flows in lower drum along downtake, forms a natural circulation carbonated drink loop with lower drum.Coal gas of converter is after again lowering the temperature, and now, gas temperature is less than 250 DEG C, can adopt the fiber bag precipitator that cost performance is higher.
Between high temperature cyclone separator 3 and fire-tube type natural circulation afterheat of converter gas boiler 6, be provided with high temperature tee joint switching valve 4, for switching between flue collector and technique bypass flue, be convenient to the boiler time-based maintenance of fire-tube type natural circulation afterheat of converter gas and breakdown maintenance.
The coal gas being less than 250 DEG C by fire-tube type natural circulation afterheat of converter gas boiler temperature out, enter fiber bag precipitator, further udst separation, coal gas dust content rate is less than 30mg/Nm 3, reach national requirements for environmental protection.
Be provided with first three-way switch valve after sack cleaner, its Main Function be coal gas from sack cleaner out after, according to coal-gas recovering processing requirement, in coal gas, the levels of CO meets processing requirement, coal gas enters coal gas of converter hold-up vessel, otherwise T-valve switches to emptying bypass.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.

Claims (7)

1. a novel two-section type afterheat of converter gas recovery system, it is characterized in that: the converter (1) comprising connection successively, converter flue (2), fire-tube type natural circulation afterheat of converter gas boiler (6), coal gas dust removal refining plant (7), described coal gas dust removal refining plant (7) stores up cabinet (9) with coal gas of converter and diffusing chimney (10) is connected, the coal gas that converter (1) produces is after converter flue (2) Vaporizing cooling, temperature is down to 800-1000 DEG C by 1400-1600 DEG C, enter fire-tube type natural circulation afterheat of converter gas boiler (6) again.
2. novel two-section type afterheat of converter gas recovery system according to claim 1, it is characterized in that: between converter flue (2) and fire-tube type natural circulation afterheat of converter gas boiler (6), be connected with a high temperature cyclone separator (3), high temperature cyclone separator (3) isolates the crude particle dust of in coal gas more than 50%.
3. novel two-section type afterheat of converter gas recovery system according to claim 2, it is characterized in that: also comprise gas cleaning device (11), a high temperature tee joint switching valve (4) is connected with between high temperature cyclone separator (3) and fire-tube type natural circulation afterheat of converter gas boiler (6), high temperature tee joint switching valve (4), gas cleaning device (11) are connected successively with coal gas of converter storage cabinet (9), formation process bypass.
4. novel two-section type afterheat of converter gas recovery system according to claim 3, is characterized in that: described coal gas dust removal refining plant (7) stores up cabinet (9) with coal gas of converter respectively by the first three-way switch valve (8) and diffusing chimney (10) is connected.
5. novel two-section type afterheat of converter gas recovery system according to claim 1, it is characterized in that: between high temperature tee joint switching valve (4) and gas cleaning device (11), be connected with the second three-way switch valve (12), the second three-way switch valve (12) is also connected with diffusing chimney (10).
6. novel two-section type afterheat of converter gas recovery system according to claim 1, it is characterized in that: described fire-tube type natural circulation afterheat of converter gas boiler (6) comprises upper drum and lower drum, on, be communicated with downtake by upcast between lower drum, the two ends of described lower drum are respectively equipped with a smoke-box (5), straight-through flue tube bank is furnished with in lower drum between two smoke-boxes (5), coal gas passes through in flue tube bank, water is filled with in lower drum outside flue tube bank, coal gas in flue tube bank carries out heat exchange with the water outside tube bank in flow process, produce saturation steam and enter upper drum from upcast, water in upper drum adds in lower drum from downtake, form a natural circulation carbonated drink loop.
7. novel two-section type afterheat of converter gas recovery system according to claim 6, it is characterized in that: described smoke-box (5) is primarily of tube sheet and drum end socket composition, also be provided with ash discharge mechanism in the bottom of smoke-box (5), flue tube bank is arranged between two tube sheets.
CN201510422673.0A 2015-07-17 2015-07-17 New two-period form afterheat of converter gas recovery system Active CN105063272B (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106051800A (en) * 2016-06-14 2016-10-26 镇江市电站辅机厂有限公司 Energy-saving and environment-friendly two-circuit parallel type smoke waste heat recycling device and method
CN109647057A (en) * 2019-02-01 2019-04-19 扬州石化有限责任公司 A kind of device and method for reducing dust content in MCP device flue gas
CN109913640A (en) * 2019-04-01 2019-06-21 东北大学 A kind of intensified-sintered experimental provision and method
CN110184408A (en) * 2019-07-03 2019-08-30 河北科技大学 A kind of RECOVERY OF CONVERTER GAS device and recovery method
CN110345455A (en) * 2019-01-02 2019-10-18 中冶华天工程技术有限公司 Internal combustion engine smoke evacuation chilldown system based on waste heat recycling

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CN101942538A (en) * 2010-06-24 2011-01-12 北京国华新兴节能环保科技有限公司 Process and equipment for dust collection and heat recovery by converter gas dry method
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
CN104745762A (en) * 2015-04-14 2015-07-01 东北大学 Dry-dedusting and waste heat recovering system and method for intermediate-temperature converter coal gas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101942538A (en) * 2010-06-24 2011-01-12 北京国华新兴节能环保科技有限公司 Process and equipment for dust collection and heat recovery by converter gas dry method
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
CN104745762A (en) * 2015-04-14 2015-07-01 东北大学 Dry-dedusting and waste heat recovering system and method for intermediate-temperature converter coal gas

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106051800A (en) * 2016-06-14 2016-10-26 镇江市电站辅机厂有限公司 Energy-saving and environment-friendly two-circuit parallel type smoke waste heat recycling device and method
CN110345455A (en) * 2019-01-02 2019-10-18 中冶华天工程技术有限公司 Internal combustion engine smoke evacuation chilldown system based on waste heat recycling
CN109647057A (en) * 2019-02-01 2019-04-19 扬州石化有限责任公司 A kind of device and method for reducing dust content in MCP device flue gas
CN109913640A (en) * 2019-04-01 2019-06-21 东北大学 A kind of intensified-sintered experimental provision and method
CN109913640B (en) * 2019-04-01 2020-05-01 东北大学 Experimental device and method for reinforced sintering
CN110184408A (en) * 2019-07-03 2019-08-30 河北科技大学 A kind of RECOVERY OF CONVERTER GAS device and recovery method
CN110184408B (en) * 2019-07-03 2021-05-04 河北科技大学 Converter gas recovery device and recovery method

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