CN101974663A - Coal gas waste heat recovery method of high-temperature rotary furnace - Google Patents
Coal gas waste heat recovery method of high-temperature rotary furnace Download PDFInfo
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- CN101974663A CN101974663A CN2010105317927A CN201010531792A CN101974663A CN 101974663 A CN101974663 A CN 101974663A CN 2010105317927 A CN2010105317927 A CN 2010105317927A CN 201010531792 A CN201010531792 A CN 201010531792A CN 101974663 A CN101974663 A CN 101974663A
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- temperature
- waste heat
- coal gas
- explosion
- heat recovery
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- 239000003034 coal gas Substances 0.000 title claims abstract description 40
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 239000002918 waste heat Substances 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000000428 dust Substances 0.000 claims abstract description 17
- 238000004880 explosion Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 4
- 238000005507 spraying Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 10
- 239000002360 explosive Substances 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000000779 smoke Substances 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 claims 1
- 238000013022 venting Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 7
- 238000009628 steelmaking Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract 1
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 230000001629 suppression Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 12
- 239000007921 spray Substances 0.000 description 5
- 238000010410 dusting Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
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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
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a coal gas waste heat recovery method of a high-temperature rotary furnace, belonging to the technical field of steel making of a rotary furnace, and relating to high-temperature waste heat recovery and utilization in steel making of the rotary furnace, in particular to a system design, an explosion-proof design and a primary dedusting design for realizing high-temperature coal gas waste heat recovery. The coal gas waste heat recovery method is characterized in that a high-temperature waste heat boiler, an intermediate-temperate waste heat boiler and a low-temperature waste heat boiler with film-type wall flued cooling structures are utilized to realize cooling for high-temperature coal gas with the temperature of more than 1400 DEG C, and reduce the temperature to be below 200 DEG C, a bending channel type water-seal dust collecting device with a movable baffle plate is utilized to separate coarse granular dusts. By utilizing a water spraying explosion-proof and explosion-suppresion system with combined control of a spring type explosion-type door, an ultraviolet flame alarm and a pressure switch, the suppression and elimination of the explosion are realized. The coal gas waste heat recovery method has the effects and benefits of being capable of realizing recovery of waste heat with the temperature from 800 DEG C to 200 DEG C, obtaining high-intermediate pressure steam, eliminating and suppressing explosion of coal gas, effectively reducing the hazard of the explosion and realizing primary dedusting on coal gas containing dusts.
Description
Technical field
The invention belongs to the converter steeling technology field, relate to the coal gas of high temperature heat recovery of converter steelmaking, specially refer to the system design that realizes the coal gas of high temperature waste heat recovery, explosion-proof design and rough dusting design.
Background technology
In convertor steelmaking process, (main component is CO/N can to produce a large amount of high temperature coal gas of converter
2/ CO
2), the coal gas initial temperature contains a large amount of sensible heats more than 1400 ℃.
At present, each steel-making company generally adopts the gasification cooling flue heat recovery technology both at home and abroad, at first high temperature coal gas of converter (more than 1400 ℃) is cooled to 800 ℃～1000 ℃, adopt " dry method " or " wet method " dedusting technology with flue gas rapid cooling to 70 ℃ or below 200 ℃ again, carry out coal-gas recovering then.
" dry method " dedusting technology is to adopt accurate quantification to spray to cool off 800～1000 ℃ of coal gas, utilize the cooling of evaporation of water latent heat, thereby do not produce sewage and mud, have efficiency of dust collection height, low, the recyclable characteristics of dry dust of system energy consumption, coal gas after the cooling dedusting, utilize electrostatic dust collection equipment to carry out the dedusting of secondary high precision again, make that dustiness reaches standard code in the coal gas.
" wet method " dedusting technology is the water spray cooling by disposable dust remover, removes the macrobead dust, and then removes fine dusts through secondary filter, makes dust content of gas reach standard code.
Purification coal gas after " dry method " or " wet method " dedusting, (CO content is greater than 35%, O with qualified coal gas through the coal gas induced draft fan
2Content is less than 2%) switch by T-valve, be sent to gas holder through water seal reverse checkvalve, V-shaped valve, defective coal gas is diffused by ignition by chimney.
Two kinds of technology compare, and " wet method " technology is than the more water resources of " dry method " technology consumption, and the huge water processing establishment of " wet method " Technology Need.
The common drawback of two kinds of technology is: all do not utilize 800～1000 ℃ of coal gas to be cooled to a large amount of sensible heats below 200 ℃, both wasted a large amount of energy, increased the consumption of water or steam again, produce a large amount of processing wastewaters simultaneously again.
How to realize that 800-1000 ℃ of coal gas is cooled to the waste heat recovery below 200 ℃, it is countries in the world steel-making industry question of common concern, there is not feasible safety method to realize this purpose at present in the world, the greatest difficulty that addresses this problem is that there is explosion hazard in coal gas below 800 ℃, realize the waste heat recovery of 800～200 ℃ of coal gas of converter, a technical barrier that at first will solve is the blast problem of coal gas of converter in this temperature section, solves the matching problem of explosion-proof, datonation-inhibition measure and purification dust removal system simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is: it is not enough with the maximum of " wet method " dedusting technology to overcome present " dry method "---and fail to make full use of 800 ℃-200 ℃ waste heat, cause a large amount of sensible heats wastes.Utilize the present invention to reclaim 800-1000 ℃ of waste heat that drops to 200 ℃, solve the gas explosion problem of this temperature section, accomplish rough dusting simultaneously dust-laden coal gas.
Technical scheme of the present invention is: 1. utilize smooth membrane wall flue boiler, make the air-flow operation unobstructed, eliminate air local accumulation in flue, fundamentally eliminate the primary condition of blast, realize waste heat recovery simultaneously; 2. utilize the bend formula water seal dust removal installation of band shifting board, realize coal gas is carried out thick dedusting, play the blast drainage function simultaneously.3. heat recovery boiler is divided into high temperature, middle temperature, low-temperature zone boiler, is connected by bend between each boiler, at following bend place dedusting passage and dust cleaning case are set, the place is provided with explosive door at last bend.Differing temps section boiler can obtain the steam of different pressures or utilize the low-temperature zone boiler that cold water is carried out preheating, enters high temperature section then and obtains high pressure steam, improves thermo-efficiency, reduces fouling.4. adopt flame scanner to survey flame and pressure switch detecting pressure, jointly control water spraying fire extinguishing system, realize self-extinguishing control.5. utilize explosive door and water seal to realize timely overpressure relief, eliminate just in case blast causes the major accident of equipment scrapping and loss of life and personal injury.
Effect of the present invention and benefit are: realize 800-200 ℃ waste heat recovery, obtain high, middle pressure steam; Eliminate and inhibition gas explosion accident, effectively reduce explosion hazard; Realization is carried out rough dusting to dust-laden coal gas.
Description of drawings
Accompanying drawing is a high temperature afterheat of converter gas recovery system schema.
Among the figure: 1 high-temperature flue formula waste heat boiler; 2 water smokes spray explosion protection system; Warm flue type residual heat boiler in 3; 4 water seal dedusting cabinets; 5 unidirectional dodge gates; 6 bend formula water seal dedusting passages; 7 low temperature flue formula waste heat boilers; 8 spring loaded explosive doors; 9 cooling back coal gas after-treatment systems.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The high temperature coal gas of converter is by membrane wall flue boiler 1 (move a section flue, fixedly flue and back-end ductwork), the waste heat recovery of realization from 1450 ℃ to (800-1000) ℃, this section coal gas flows in flue from bottom to top, and some macrobead dirt slags can drop in the converter; Warm membrane wall flue boiler 3 during coal gas flows downward and enters then, realize 800-1000 ℃ to 400-500 ℃ waste heat recovery, then coal gas is through bend formula water seal dedusting passage, coal gas is turned and is moved upward, by low temperature flue formula boiler 7, realize 400-500 ℃ to the waste heat recovery below 200, this moment, gas velocity reduced, some dusts enter in the dedusting cabinet 4 because of deadweight drops to 6 bottoms in the water seal passage; For preventing that coal gas from entering bend formula water seal passage lower linking tube, on adapter top shifting board 5 is installed, but the certain interval of time automatic or manual moves downward baffle plate, and dust stratification on the baffle plate is fallen in the water seal dust cleaning case 4.Blast in middle temperature flue boiler 3 and low temperature flue boiler 7 for preventing coal gas, the design of boiler runner should be smooth, unobstructed, two upper boiler water smoke sprinkling extinguishing device 2 is installed simultaneously, the water smoke device begins what each coal gas flow through this section that to carry out atomized water spray explosion-proof, when the air that coal gas gathers in pipeline is arrived in the downstream, just stop spraying, certain distance is installed ultraviolet flame detectors and pressure switch on this section boiler in addition, but sensing inside has flame or pressure to raise above limit value, then start the water smoke spray equipment, put out a fire.For preventing just in case the super high pressure accident of blasting in the boiler, mounting spring formula explosive door 8 on recovery system, the dedusting of water seal simultaneously passage 6 bottoms are taken over also can be as blast overpressure relief passage.
Claims (3)
1. high temperature afterheat of converter gas recovery method, be to utilize to go up turning down sectional type flue residue heat recovery boiler, make the air-flow operation unobstructed, reduce air local accumulation in flue, eliminate the primary condition of blast, realize waste heat recovery, it is characterized in that the flue residue heat recovery boiler is divided into three sections of high temperature, middle temperature, low temperature; Utilize the bend formula water seal dust removal installation of band shifting board, air flow line is changed, flow velocity reduces, make the dirt slag by the self gravitation landing, reach the thick dust removing effects of coal gas, the band water seal of bend bottom is taken over, both can make the dirt slag fall into dust cleaning case, play the blast drainage function again; Adopt flame scanner to survey flame and pressure switch detecting pressure, jointly control water spraying fire extinguishing system, realize self-extinguishing control, the venting of dust explosion mouth is set, utilize the now timely overpressure relief of explosive door and water seal cause for gossip at the place of bend up and down of middle gentle low temperature boiler.
2. according to right 1 described a kind of high temperature afterheat of converter gas recovery method, it is characterized in that adopting vertical segmentation flue type residual heat recovery boiler, connected by bend between high temperature, middle temperature, low-temperature zone boiler, at following bend place dedusting passage and dust cleaning case are set, the place is provided with explosive door at last bend.
3. according to right 1 described a kind of high temperature afterheat of converter gas recovery method, it is characterized in that the water smoke sprinkling fire-distinguishing explosion protection system that adopts ultraviolet flame detectors and pressure switch to jointly control realizing explosion-proof datonation-inhibition effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105317927A CN101974663A (en) | 2010-11-02 | 2010-11-02 | Coal gas waste heat recovery method of high-temperature rotary furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105317927A CN101974663A (en) | 2010-11-02 | 2010-11-02 | Coal gas waste heat recovery method of high-temperature rotary furnace |
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| Publication Number | Publication Date |
|---|---|
| CN101974663A true CN101974663A (en) | 2011-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105317927A Pending CN101974663A (en) | 2010-11-02 | 2010-11-02 | Coal gas waste heat recovery method of high-temperature rotary furnace |
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| Country | Link |
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| CN (1) | CN101974663A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966944A (en) * | 2012-12-11 | 2013-03-13 | 中国东方电气集团有限公司 | CFB (Circulating Fluidized Bed)-rotary radiation boiler for reducing contamination of high-alkalinity coal |
| WO2021018030A1 (en) * | 2019-07-30 | 2021-02-04 | 中国科学院力学研究所 | Converter gas aftertreatment and waste heat recovery device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536094A (en) * | 2003-04-11 | 2004-10-13 | 中冶赛迪工程技术股份有限公司 | Connection device of movable smoke cover for converter |
| CN201065415Y (en) * | 2007-07-12 | 2008-05-28 | 鞍钢集团设计研究院 | Double-layer overflow water sealing trough |
| CN101451173A (en) * | 2007-11-28 | 2009-06-10 | 中冶赛迪工程技术股份有限公司 | Converter gas dry method pocket type purification and recovery process and system |
-
2010
- 2010-11-02 CN CN2010105317927A patent/CN101974663A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1536094A (en) * | 2003-04-11 | 2004-10-13 | 中冶赛迪工程技术股份有限公司 | Connection device of movable smoke cover for converter |
| CN201065415Y (en) * | 2007-07-12 | 2008-05-28 | 鞍钢集团设计研究院 | Double-layer overflow water sealing trough |
| CN101451173A (en) * | 2007-11-28 | 2009-06-10 | 中冶赛迪工程技术股份有限公司 | Converter gas dry method pocket type purification and recovery process and system |
Non-Patent Citations (1)
| Title |
|---|
| 《冶金能源》 20100930 潘秀兰 转炉煤气回收和利用技术的最新进展 37-42 1-3 第29卷, 第5期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966944A (en) * | 2012-12-11 | 2013-03-13 | 中国东方电气集团有限公司 | CFB (Circulating Fluidized Bed)-rotary radiation boiler for reducing contamination of high-alkalinity coal |
| CN102966944B (en) * | 2012-12-11 | 2015-05-13 | 中国东方电气集团有限公司 | CFB (Circulating Fluidized Bed)-rotary radiation boiler for reducing contamination of high-alkalinity coal |
| WO2021018030A1 (en) * | 2019-07-30 | 2021-02-04 | 中国科学院力学研究所 | Converter gas aftertreatment and waste heat recovery device |
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Application publication date: 20110216 |