CN103757175A - Converter high-temperature flue gas heat recovery and dust purification system - Google Patents
Converter high-temperature flue gas heat recovery and dust purification system Download PDFInfo
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- CN103757175A CN103757175A CN201410029696.0A CN201410029696A CN103757175A CN 103757175 A CN103757175 A CN 103757175A CN 201410029696 A CN201410029696 A CN 201410029696A CN 103757175 A CN103757175 A CN 103757175A
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Abstract
The invention provides a converter high-temperature flue gas heat recovery and dust purification system, relating to a heat recovery and dust purification system, particularly a device for recovering heat in high-temperature flue gas generated in a converter smelting process and purifying dust-containing flue gas. The converter high-temperature flue gas heat recovery and dust purification system is composed of a waste heat boiler, a bypass blower, a dry-process bag filter, a blower, a valve and the like. High-temperature raw gas generated in the converter smelting process enters a water cooling flue through a hood, so that heat in the flue gas is absorbed by water in a boiler water sleeve; and meanwhile, the flue gas is sprayed to perform extinguishment, cooling and rough dust removal, and is further purified by the bag filter. The system has the advantages of simple structure, low cost, small occupied area, high degree of automation and high operation safety; and the waste heat recovery device is mainly adopted to implement recovery in the cooling and rough dust removal process, and has obvious dust purification effect, so that the dust content in the converter coal gas can be controlled at 5mg/Nm<3> below, and the purification rate is much higher than that of the wet process and semi-dry process. The system has obvious economic and environmental benefits, and implements low-energy-consumption or no-energy-consumption converting in the whole heat recovery process. The system greatly enhances the economic and social benefits of the enterprises.
Description
Technical field
What the present invention relates to is energy recovery and dust purification system, specifically a kind of heat energy of the high-temperature flue gas producing when reclaiming converter smelting and ash-laden gas is carried out to reclaiming clean device.
Background technology
Converter produces the flue gas that contains in a large number carbon monoxide in smelting process, is commonly called as " raw gas ", and its temperature, up to 1450 ℃, contains a large amount of dust in flue gas simultaneously, and dust content is up to 100～120g/Nm
3.Dust main component is the oxide compound of iron and iron, as flue gas bulk storage is fallen, has not only wasted wherein a large amount of heat energy, also can cause serious pollution to atmosphere.For the heat energy in recovered flue gas and dust, and make the flue gas utilization that is purified, guarantee the normal operation of follow-up equipment, raw gas must be carried out after dedusting, could use.At present, converter raw gas mainly adopts wet method (OG method) and two kinds of reclaiming clean techniques of semidrying (LT method).Wet method (OG method) reclaiming clean technique: be that nippon and Kawasaki company develop jointly the reclaiming clean technology of development the sixties in last century, this technology is mainly comprised of evaporated cooling system, secondary purification system, dewatering system, Sewage treatment systems, dreg removing system, water cycle and cooling system etc., flue gas is down to 800～950 ℃ through cooling stack temperature by approximately 1450 ℃, enter water washing dedust purification system, temperature is down to approximately 50 ℃, remove the dust in flue gas, dust contained flue gas concentration is down to about 80mg/Nm
3, send into gas storage cabinet, with the sewage of dust, enter settling system through separated, concentrated, processed, sewage is recycle after treatment, and moisture dust is stand-by after drying.Wet method (OG method) reclaiming clean technique one-time investment and floor space is large, running cost is high, secondary pollution is serious, when operation water loss large, need carry out secondary treatment to water.Sewage disposal difficulty.Heat energy in flue gas all loses along with the processing of gasify cooling and hydrologic cycle cooling system.After purifying, dust contained flue gas concentration is still up to 80mg/Nm
3above, can not meet the requirement of subsequent production technique.Before entering flue gas cabinet, need to increase wet-esp for this reason and carry out again smart dedusting, make its dust contained flue gas concentration be controlled at about 20mg/Nm
3, equipment corrosion is serious, and easily blasts.Semidrying (LT method) is converter raw gas semidrying (LT method) the reclaiming clean Technology that He Disen steel mill of German Lu Qi company developed jointly at the end of the sixties in last century, system is mainly by evaporative cooler, round tube type electric precipitator, flue gas washing water cooler, the compositions such as steam separator, flue gas is down to 800～1000 ℃ by indirect heat exchange temperature by 1450 ℃ of left and right through cooling stack, then enter evaporative cooler and be down to 180～200 ℃ by direct heat exchange temperature, reduced the resistivity of flue gas simultaneously, collected after meal dirt, enter round tube type electric precipitator, further purify, dust content of gas is down to about 20mg/Nm
3, reach dust removing effects.LT method is not only invested high, and fault is many, operational difficulty, and due to electric precipitation electric discharge, often there is the local quick-fried phenomenon of dodging, structure deteriorate is serious.There is equally thermal waste problem with OG method.That is to say, above two kinds for the treatment of systems all only have the function of udst separation, and not by a large amount of heat energy recycle functions in flue gas, therefore cause the waste of a large amount of heat energy.
Summary of the invention
For above-mentioned situation, the object of this invention is to provide a kind of converter high-temperature flue gas energy recovery and flue gas purification system, for the energy recovery in converter steelmaking process high-temperature flue gas, and the dust in flue gas is removed, make dust content be controlled at 5mg/Nm
3below.Overcome consumption and the secondary pollution problem of water in wet method (OG method) the reclaiming clean process of using in prior art, and the quick-fried phenomenon of sudden strain of a muscle and energy dissipation problem that in (LT method), electric precipitation when electric discharge produces.
The present invention addresses the above problem the technical scheme of taking to be; By waste heat boiler, bypass blower fan, dry-method bag-type fly-ash separator, blower fan, valve etc., formed, at the front end of system with waste heat boiler.In the outlet of waste heat boiler with three-way switch valve, at the rear portion of waste heat boiler with dry-method bag-type fly-ash separator.Dry-method bag-type fly-ash separator is for being arranged in parallel.Waste heat boiler is connected with dry-method bag-type fly-ash separator with bypass blower fan respectively by three-way switch valve.In the bottom of waste heat boiler and dry-method bag-type fly-ash separator with pneumatic ash conveying plant.The outlet of sack cleaner is by pipeline connecting fan, and blower fan is connected and diffused three-way switch valve by pipeline, diffuses three-way switch valve and connects respectively diffusing tower and user.Between waste heat boiler and the pneumatic ash conveying plant of dry-method bag-type fly-ash separator with total ash silo.In system, dispose nitrogen supply (NS) case and chilled(cooling) water supply (CWS) case.Nitrogen supply (NS) case and chilled(cooling) water supply (CWS) case are connected with waste heat boiler respectively.Converter evaporation cooling air flue is connected with waste heat boiler.
Waste heat boiler is divided into radiation section, spray section and convection zone three parts, and is provided with steam pockets, thermophore and steam-water pipeline etc.Main Function is the omnidistance heat energy that reclaims high-temperature flue gas in converter steelmaking process, and the thermal energy storage of recovery is in thermophore.Method of work of the present invention is: the high temperature raw gas that converter produces in smelting process enters water-cooled flue by petticoat pipe, through water-cooled flue gas temperature, be down to 950 ℃ of left and right, when through waste heat boiler, the heat of high-temperature flue gas is absorbed by the water in boiler water jacket, flue gas is sprayed, to reach the object of fire extinguishing cooling and thick dedusting simultaneously.Radiation section through waste heat boiler cools the temperature to approximately 600 ℃; Through spray atomizing cooling section, gas temperature is down to rapidly to approximately 450 ℃ by 600 ℃ again, prevented that coal gas of converter from producing the possibility of blast (gas explosion ultimate temperature is～500 ℃) between this temperature, from atomization cooling section raw gas out again after convection zone gas temperature reduce to 150 ℃～200 ℃ so that follow-up pocket type reclaims.The water and steam that absorbs heat enters in steam pockets and thermophore, according to user's demand, carries out grid-connected use.Through the flue gas of thick dedusting, enter in dry-method bag-type fly-ash separator by three-way switch valve, to the further filtration treatment of flue gas, the dust filtering down enters into pneumatic ash conveying plant again, then concentrates and be sent to total ash silo.Flue gas after being filtered is delivered to user and diffusing tower under the traction of blower fan.
In raw gas, oxygen index and CO content meet not to reclaim while requiring, and rest dry-method bag-type fly-ash separator, and high-temperature flue gas send and delivers to dry-method bag-type fly-ash separator again after waste heat boiler reclaims heat energy.Coal gas is after elementary pre-treatment (150 ℃～200 ℃), and after the dry-method bag-type fly-ash separator dedusting of arranging side by side by some, dust content of gas is less than 5mg/Nm
3.Coal gas after purification is the control requirement to CO concentration according to user, and it is stand-by that satisfactory coal gas is sent into user appointed place after gas fan pressurization, and undesirable coal gas is sent into diffusing tower ignition bleeding after gas fan pressurization.
The present invention except system architecture simple, cheap, floor space is little, level of automation is high, outside operating safety, also has advantages of following: 1. adopted waste-heat recovery device, in cooling and thick dedusting, reclaimed heat energy; 2. adopted dry-method bag-type fly-ash separator in parallel, dust removing effects is remarkable, and the dust content in coal gas of converter can be controlled in 5mg/Nm
3below, far away higher than the 80mg/Nm of wet method (OG method) reclaiming clean
3, the 20mg/Nm of semidrying (LT method) reclaiming clean
3; 3. in dry-method bag-type fly-ash separator bottom, be provided with fully-closed ash conveying device, reduced the secondary pollution to environment, and the direct second stage employ of the dust reclaiming; 4. be provided with bypass subsystem, in coal gas, oxygen index and CO content are satisfied reclaims while requiring, and after the heat energy in reclaiming high-temperature flue gas, delivers to secondary dedusting system, guarantees gas dry-dedusting system safe and reliable operation.Economic benefit and environmental benefit are superior, and omnidistance energy recovery has realized less energy-consumption or Non-energy-consumption converter steelmaking.Economic benefit and the social benefit of enterprise have been increased substantially.
Accompanying drawing explanation
Accompanying drawing is structural representation of the present invention.
1-waste heat boiler 2-pneumatic ash conveying plant 3-three-way switch valve 4-bypass blower fan 5-dry-method bag-type fly-ash separator 6-blower fan 7-diffuses the total ash silo 9-diffusing tower of three-way switch valve 8-10-user 11-chilled(cooling) water supply (CWS) case 12-nitrogen supply (NS) case
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described; By waste heat boiler, bypass blower fan, dry-method bag-type fly-ash separator, blower fan, valve etc., formed, at the front end of system with waste heat boiler 1.In the outlet of waste heat boiler 1 with three-way switch valve 3, at the rear portion of waste heat boiler with dry-method bag-type fly-ash separator 5.Dry-method bag-type fly-ash separator is for being arranged in parallel.Waste heat boiler is connected with dry-method bag-type fly-ash separator with bypass blower fan 4 respectively by three-way switch valve.In the bottom of waste heat boiler and dry-method bag-type fly-ash separator with pneumatic ash conveying plant 2.The outlet of sack cleaner is by pipeline connecting fan 6, and blower fan is connected and diffused three-way switch valve 7 by pipeline, diffuses three-way switch valve and connects respectively diffusing tower 9 and user 10.Between waste heat boiler 1 and the pneumatic ash conveying plant of dry-method bag-type fly-ash separator 5 with total ash silo 8.In system, dispose nitrogen supply (NS) case 12 and chilled(cooling) water supply (CWS) case 11.Nitrogen supply (NS) case 12 and chilled(cooling) water supply (CWS) case 11 are connected with waste heat boiler respectively.Converter evaporation cooling air flue is connected with waste heat boiler 1.
Claims (1)
1. converter high-temperature flue gas energy recovery and dust purification system, it is characterized in that: at the front end of system with waste heat boiler (1), in the outlet of waste heat boiler with three-way switch valve (3), at the rear portion of waste heat boiler with dry-method bag-type fly-ash separator (5), dry-method bag-type fly-ash separator is for being arranged in parallel, waste heat boiler by three-way switch valve respectively with bypass blower fan (4) and dry-method bag-type fly-ash separator, in the bottom of waste heat boiler and dry-method bag-type fly-ash separator with pneumatic ash conveying plant (2), the outlet of sack cleaner is by pipeline connecting fan (6), blower fan is connected and is diffused three-way switch valve (7) by pipeline, between waste heat boiler and the pneumatic ash conveying plant of dry-method bag-type fly-ash separator with total ash silo (8), in system, dispose nitrogen supply (NS) case (12) and chilled(cooling) water supply (CWS) case (11).
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| CN201410029696.0A CN103757175A (en) | 2014-01-17 | 2014-01-17 | Converter high-temperature flue gas heat recovery and dust purification system |
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| CN201410029696.0A CN103757175A (en) | 2014-01-17 | 2014-01-17 | Converter high-temperature flue gas heat recovery and dust purification system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004879A (en) * | 2014-06-11 | 2014-08-27 | 中冶南方工程技术有限公司 | Equipment and method for recovering low-temperature-section waste heat of primary converter flue gas |
| CN107754460A (en) * | 2016-08-19 | 2018-03-06 | 张丽媛 | The blow-on fume environment protection handling process of zinc sulfide concentrates fluidized roaster |
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| CN201485480U (en) * | 2009-08-27 | 2010-05-26 | 北京博鹏北科科技有限公司 | Converter flue gas waste heat recovery and purifying dedusting device |
| 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 |
| CN103333987A (en) * | 2013-07-09 | 2013-10-02 | 辽宁环宇环保技术有限公司 | Converter gas dry method bag-type recovering and purifying process system |
| CN103374641A (en) * | 2012-04-20 | 2013-10-30 | 佛山市三叶环保设备工程有限公司 | Converter gas cloth-bag dust-removing purification method based on energy recycling |
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2014
- 2014-01-17 CN CN201410029696.0A patent/CN103757175A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201485480U (en) * | 2009-08-27 | 2010-05-26 | 北京博鹏北科科技有限公司 | Converter flue gas waste heat recovery and purifying dedusting device |
| 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 |
| CN103374641A (en) * | 2012-04-20 | 2013-10-30 | 佛山市三叶环保设备工程有限公司 | Converter gas cloth-bag dust-removing purification method based on energy recycling |
| CN103333987A (en) * | 2013-07-09 | 2013-10-02 | 辽宁环宇环保技术有限公司 | Converter gas dry method bag-type recovering and purifying process system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104004879A (en) * | 2014-06-11 | 2014-08-27 | 中冶南方工程技术有限公司 | Equipment and method for recovering low-temperature-section waste heat of primary converter flue gas |
| CN104004879B (en) * | 2014-06-11 | 2016-08-10 | 中冶南方工程技术有限公司 | Flue gas low-temperature section waste heat recovery apparatus of converter and exhaust heat recovering method |
| CN107754460A (en) * | 2016-08-19 | 2018-03-06 | 张丽媛 | The blow-on fume environment protection handling process of zinc sulfide concentrates fluidized roaster |
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Application publication date: 20140430 |