CN102260539B - COREX shaft furnace gas dry process cloth bag dust removal and energy recycling method and system - Google Patents
COREX shaft furnace gas dry process cloth bag dust removal and energy recycling method and system Download PDFInfo
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- CN102260539B CN102260539B CN 201110183759 CN201110183759A CN102260539B CN 102260539 B CN102260539 B CN 102260539B CN 201110183759 CN201110183759 CN 201110183759 CN 201110183759 A CN201110183759 A CN 201110183759A CN 102260539 B CN102260539 B CN 102260539B
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Abstract
The invention discloses a COREX shaft furnace gas dry process cloth bag dust removal and energy recycling method which comprises the following steps of: (1) discharging high-temperature gas exhausted through a fusing gasification furnace from the top of the furnace through a pipeline and entering rough dust removal equipment for carrying out rough particle separation; (2) after carrying out rough particle separation, delivering the gas into a gas cooler; (3) delivering the cooled gas into cloth bag dust removal equipment and purifying the gas at the filter wind speed of 0.2-0.3m/min; (4) carrying out secondary cooling on the gas by secondary cooling equipment; (5) pressurizing a system to 420kPa through a pressurizing device; and dividing the gas into three parts for being respectively used as the cooling gas of the fusing gasification furnace outlet gas and the pressure equalizing gas of a fusing gasification furnace and a reducing furnace and using the residual part as energy recycling gas. The method greatly improves the dust removal efficiency, has low system resistance loss, reduces the capability of a pressurizing machine as for a gas pressurizing system behind the fusing gasification furnace, saves the investment, reduces the energy consumption; and the invention has the second aim of providing a COREX shaft furnace gas dry process cloth bag dust removal and energy recycling system.
Description
Technical field
The present invention relates to detached job and energy recovery field of engineering technology, particularly a kind of COREX shaft furnace coal gas dry-method bag-type dust collecting and energy reclaiming method, also relate to a kind of COREX shaft furnace coal gas dry-method bag-type dust collecting and energy-recuperation system simultaneously.
Background technology
Iron And Steel Industry be break away from the coking coal resource shortage to the yoke of development, adapt to the environmental protection requirement that day by day improves, reduce the Iron and Steel Production energy consumption, improve the steel products structure and improve quality and quality, seek to solve the approach that steel scrap shortage and waste steel quality constantly worsen, the comprehensive utilization that realizes resource, developed the non-blast furnace ironmaking technology take noncoking coal as basic energy resource or be called non-burnt ironmaking technology.
From more than 10 year of early 1980s, take coal as main energy sources, reduce take oxygen or oxygen-rich air as reaction medium and tens of kinds of smelting reduction process such as oxygen coal technique COREX of melting have passed through industry or half type approval test.November in 1989, the 1st COREX shaft furnace process of VAI exploitation realized suitability for industrialized production.
In the coal gas that produces in COREX shaft furnace iron manufacturing process, furnace top pressure is higher, and gas temperature is stable, has higher recovery value.The method that both at home and abroad gas purification of COREX shaft furnace is reclaimed at present is mainly to complete by cleaning coal gas, and the method is mainly to continue to use traditional blast furnace gas cleaning way, has mature and reliable, steady performance.The wet ash that but it exists, and system energy consumption is higher, floor space is large, dedusting is got off is inconvenient to transport the shortcomings such as processing, TRT recovery gas turbine generated energy be low.
Summary of the invention
In view of this, one of purpose of the present invention is to provide a kind of COREX shaft furnace coal gas dry-method bag-type dust collecting and energy reclaiming method, the method efficiency of dust collection improves greatly, the simultaneity factor resistance is damaged low, for gas pressure system after melting gasification furnace, reduce the ability of press, reduced again energy consumption when reducing investment outlay; Two of purpose of the present invention is to provide a kind of COREX shaft furnace coal gas dry-method bag-type dust collecting and energy-recuperation system.
One of purpose of the present invention is achieved through the following technical solutions:
This COREX shaft furnace coal gas dry-method bag-type dust collecting and energy reclaiming method comprise the following steps:
The coal gas of high temperature of 1) melting gasification furnace being discharged picks out by pipeline from furnace roof, enters thick dust removal installation and carries out the coarse particles separation;
2) separate by coarse particles after, coal gas is sent into gas cooler, temperature is reduced to 150-200 ℃ through sufficient heat exchange;
3) cooled coal gas is sent into bag-type dust equipment, under the filtration velocity of 0.2 ~ 0.3m/min, coal gas is purified, the flue dust of collecting is collected and is recycled by Pneumatic conveyer;
4) by the secondary cooling apparatus, coal gas is carried out secondary cooling;
5) by pressurizing device, system is forced into 420kPa; Coal gas is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, remainder is as energy recovery coal gas.
Further, after step 5), also comprise the step 6) of carrying out dry-method bag-type dust collecting and energy recovery to by reduction furnace raw gas out, this step comprises:
61) after the process gas cooler is reduced to 150-200 ℃ with temperature, enter the bag-type dust facility, under the filtration velocity of 0.2 ~ 0.3m/min, dust-laden coal gas is by bag-type dust equipment again, thereby coal gas is purified, and the flue dust of collecting is collected and is recycled by Pneumatic conveyer;
Further, described step 61) after, also comprise step 62): after soon converging by the reduction furnace coal gas after the bag-type dust facility and melting gasification furnace residual gas, as satisfy the TRT power generation conditions, carry out top pressure power generation by the TRT apparatus for energy recovery, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group;
Further, the thick dust removal installation in described step 1) is hot tornado dust collector or gravitational precipitator;
Further, the secondary cooling apparatus in described step 4) is multi-stage heat-exchanger or multistage washing tower.
Two of purpose of the present invention is achieved through the following technical solutions:
This COREX shaft furnace coal gas dry-method bag-type dust collecting and energy-recuperation system comprise fusion and gasification producer gas processing subsystem, and this subsystem comprises thick dust removal installation, gas cooler I, bag-type dust equipment I, secondary cooling apparatus and pressurizing device;
Described thick dust removal installation is used for that the coal gas of high temperature that melting gasification furnace is discharged is carried out coarse particles and separates; Coal gas after coarse particles separates is sent into gas cooler I, through sufficient heat exchange, temperature is reduced to 150-200 ℃;
Described bag-type dust equipment I is used for cooled coal gas is purified under the filtration velocity of 0.2 ~ 0.3m/min, and the flue dust of collecting is collected and recycled by Pneumatic conveyer;
Described secondary cooling apparatus is cooling for the coal gas after purifying being carried out secondary;
Described pressurizing device is used for the cooled coal gas system of secondary and is forced into 420kPa; Coal gas after pressurization is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, and remainder is as energy recovery coal gas.
Further, described system also comprises reduction furnace raw gas processing subsystem, and this subsystem comprises gas cooler II, bag-type dust equipment I I;
Described gas cooler II is used for the temperature of reduction furnace raw gas out is reduced to 150-200 ℃; Described bag-type dust equipment I I is used under the filtration velocity of 0.2 ~ 0.3m/min, coal gas being purified, and the flue dust of collecting is collected and recycled by Pneumatic conveyer;
Further, described system also comprises the aftertreatment subsystem, described aftertreatment subsystem comprises the TRT apparatus for energy recovery, after converging by the reduction furnace coal gas after bag-type dust equipment I I and melting gasification furnace residual gas, as satisfy the TRT power generation conditions, carry out top pressure power generation by the TRT apparatus for energy recovery, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group;
Further, described thick dust removal installation is hot tornado dust collector or gravitational precipitator;
Further, described secondary cooling apparatus is multi-stage heat-exchanger or multistage washing tower.
The invention has the beneficial effects as follows:
1) adopt cloth bag to carrying out smart dedusting through the coal gas after cooling and thick dedusting, dust removing effects can reach the coal gas dust content discharging and recovery standard of national regulation; Utilize the high-level efficiency dedusting of cloth bag, can make dust content of gas reach 5mg/Nm
3, and dust removing effects is stable;
2) relative wet method system adopts bag-type dust can save the energy consumption of recirculated water and investment and the occupation of land of sewage disposal, the dry ash of bag-type dust removal system more convenient transportation with respect to wet ash simultaneously, processing;
3) more than 99%, drag losses is less than 5000Pa to the efficiency of dust collection of coal gas for sack cleaner, and system's resistance is damaged low, for gas pressure system after melting gasification furnace, has reduced the ability of press, has reduced again energy consumption when reducing investment outlay;
4) adopt bag-type dust removal system, TRT turbine system entry gas pressure is high, and temperature is high, and the TRT generated energy is high than wet method;
5) utilize flow process of the present invention, can effectively recycle COREX shaft furnace coal gas, and take full advantage of its overbottom pressure and temperature to generate electricity, under lower input, can reach the purpose of energy-saving and environmental protection.
Other advantages of the present invention, target and feature will be set forth to a certain extent in the following description, and to a certain extent, based on being apparent to those skilled in the art to investigating hereinafter, perhaps can be instructed from the practice of the present invention.Target of the present invention and other advantages can realize and obtain by following specification sheets and claims.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing, wherein:
Fig. 1 is that system of the present invention forms schematic diagram;
Fig. 2 is various parts connection diagram of the present invention.
Embodiment
Hereinafter with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail.Should be appreciated that preferred embodiment only for the present invention is described, rather than in order to limit protection scope of the present invention.
In Fig. 2: 1-melting gasification furnace; 2-reduction furnace; 3-thick dust removal installation; 4-gas cooler I; 9-gas cooler II; 5-bag-type dust equipment I; 10-bag-type dust equipment I I; 6-secondary cooling apparatus; 7-relief valve; 8-pressurizing device; 11-by-pass valve group; 12-power generation assembly; 13-by-pass valve control.
As depicted in figs. 1 and 2, COREX shaft furnace coal gas dry-method bag-type dust collecting of the present invention and energy-recuperation system, comprise fusion and gasification producer gas processing subsystem, this subsystem comprises thick dust removal installation 3, gas cooler I 4, bag-type dust equipment I 5, secondary cooling apparatus 6 and pressurizing device 8;
Wherein, thick dust removal installation is used for the coal gas of high temperature that melting gasification furnace is discharged is carried out the coarse particles separation; Coal gas after coarse particles separates is sent into gas cooler I, through sufficient heat exchange, temperature is reduced to 150-200 ℃; In the present embodiment, described thick dust removal installation is hot tornado dust collector or gravitational precipitator.
The bag-type dust equipment I is used for cooled coal gas is purified under the filtration velocity of 0.2 ~ 0.3m/min, and the flue dust of collecting is collected and recycled by Pneumatic conveyer;
The secondary cooling apparatus is cooling for the coal gas after purifying being carried out secondary; In the present embodiment, described secondary cooling apparatus is multi-stage heat-exchanger or multistage washing tower.
Pressurizing device is used for the cooled coal gas system of secondary and is forced into 420kPa; Coal gas after pressurization is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, and remainder is as energy recovery coal gas.
As further improvement, this system also comprises reduction furnace raw gas processing subsystem, and this subsystem comprises gas cooler II 9, bag-type dust equipment I I 10; Gas cooler II 9 is used for the temperature of reduction furnace raw gas out is reduced to 150-200 ℃; Bag-type dust equipment I I 10 is used under the filtration velocity of 0.2 ~ 0.3m/min, coal gas being purified, and the flue dust of collecting is collected and recycled by Pneumatic conveyer.
As further improvement, this system also comprises the aftertreatment subsystem, the aftertreatment subsystem comprises TRT apparatus for energy recovery 12, after converging by the reduction furnace coal gas after bag-type dust equipment I I and melting gasification furnace residual gas, as satisfy the TRT power generation conditions, carry out top pressure power generation by the TRT apparatus for energy recovery, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group.In the present embodiment, the TRT apparatus for energy recovery is TRT turbine blower fan.
By the application of said system, COREX shaft furnace coal gas dry-method bag-type dust collecting of the present invention and energy reclaiming method comprise the following steps:
The coal gas of high temperature of 1) melting gasification furnace being discharged picks out by pipeline from furnace roof, enters thick dust removal installation and carries out the coarse particles separation; In this step, the dustiness in the melting gasification furnace coal gas of high temperature is reduced to 20g/Nm
3The left and right will be removed greater than the dust granule of 10 μ m.Its state point 1. point as shown in Figure 2.
2) gas temperature after separating by coarse particles is approximately 850 ℃, dustiness 20g/Nm
3The left and right, particle diameter＜10 μ m, pressure 400kPa sends coal gas into gas cooler, through sufficient heat exchange, temperature is reduced to 150-200 ℃; Its state point is 2. point as shown in drawings.
3) be 150-200 ℃ by the cooling rear gas temperature of gas cooler, dustiness 20g/Nm
3The left and right, particle diameter＜10 μ m send cooled coal gas into the bag-type dust equipment I, under the filtration velocity of 0.25m/min, coal gas are purified, and the flue dust of collecting is collected and is recycled by Pneumatic conveyer; Can reach＜5mg/Nm by the dust content of gas after bag-type dust equipment
3, temperature is 150-200 ℃, pressure 385kPa, its state point be 3. point as shown in drawings.
4) by the secondary cooling apparatus, coal gas is carried out secondary cooling; 40 ℃ of left and right of cooling rear gas temperature, its state point are 4. point as shown in drawings.
5) by pressurizing device, system is forced into 420kPa; Coal gas is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, remainder is as energy recovery coal gas.
6) to carrying out dry-method bag-type dust collecting and energy recovery by reduction furnace raw gas out, this step comprises:
61) by reduction furnace out raw gas (state point 5.) through gas cooler 9 temperature is reduced to 200-220 ℃ after (state point 6.), enter again bag-type dust equipment I I, under the filtration velocity of 0.25m/min, dust-laden coal gas is by bag-type dust equipment, thereby coal gas is purified, and the flue dust of collecting is collected and is recycled by Pneumatic conveyer; By the dust content of gas＜5mg/Nm after bag-type dust equipment I I 10
3, gas temperature is 195 ℃, pressure 310kPa, its state point be 7. point as shown in drawings.
62) will converge by the reduction furnace coal gas after the bag-type dust facility and melting gasification furnace residual gas after, as satisfy the TRT power generation conditions, carry out top pressure power generation by TRT apparatus for energy recovery 12, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group.
Wherein, the thick dust removal installation in described step 1) can be adopted as hot tornado dust collector or gravitational precipitator; Secondary cooling apparatus in step 4) can adopt multi-stage heat-exchanger or multistage washing tower.
Explanation is at last, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of the technical program, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1.COREX shaft furnace coal gas dry-method bag-type dust collecting and energy reclaiming method is characterized in that: comprise the following steps:
The coal gas of high temperature of 1) melting gasification furnace being discharged picks out by pipeline from furnace roof, enters thick dust removal installation and carries out the coarse particles separation;
2) separate by coarse particles after, coal gas is sent into gas cooler, temperature is reduced to 150-200 ℃ through sufficient heat exchange;
3) cooled coal gas is sent into bag-type dust equipment, under the filtration velocity of 0.2 ~ 0.3m/min, coal gas is purified, the flue dust of collecting is collected and is recycled by Pneumatic conveyer;
4) by the secondary cooling apparatus, coal gas is carried out secondary cooling;
5) by pressurizing device, system is forced into 420kPa; Coal gas is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, remainder is as energy recovery coal gas;
6) to carrying out dry-method bag-type dust collecting and energy recovery by reduction furnace raw gas out: after through gas cooler, temperature being reduced to 150-200 ℃, enter again the bag-type dust facility, under the filtration velocity of 0.2 ~ 0.3m/min, dust-laden coal gas is by bag-type dust equipment, thereby coal gas is purified, and the flue dust of collecting is collected and is recycled by Pneumatic conveyer;
7) will converge by the reduction furnace coal gas after the bag-type dust facility and melting gasification furnace residual gas after, as satisfy the TRT power generation conditions, carry out top pressure power generation by the TRT apparatus for energy recovery, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group.
2. COREX shaft furnace coal gas dry-method bag-type dust collecting according to claim 1 and energy reclaiming method, it is characterized in that: the thick dust removal installation in described step 1) is hot tornado dust collector or gravitational precipitator.
3. COREX shaft furnace coal gas dry-method bag-type dust collecting according to claim 1 and energy reclaiming method, it is characterized in that: the secondary cooling apparatus in described step 4) is multi-stage heat-exchanger or multistage washing tower.
4.COREX shaft furnace coal gas dry-method bag-type dust collecting and energy-recuperation system, it is characterized in that: described system comprises fusion and gasification producer gas processing subsystem, and this subsystem comprises thick dust removal installation, gas cooler I, bag-type dust equipment I, secondary cooling apparatus and pressurizing device;
Described thick dust removal installation is used for that the coal gas of high temperature that melting gasification furnace is discharged is carried out coarse particles and separates; Coal gas after coarse particles separates is sent into gas cooler I, through sufficient heat exchange, temperature is reduced to 150-200 ℃;
Described bag-type dust equipment I is used for cooled coal gas is purified under the filtration velocity of 0.2 ~ 0.3m/min, and the flue dust of collecting is collected and recycled by Pneumatic conveyer;
Described secondary cooling apparatus is cooling for the coal gas after purifying being carried out secondary;
Described pressurizing device is used for the cooled coal gas system of secondary and is forced into 420kPa; Coal gas after pressurization is divided into 3 parts, is used separately as all pressures coal gas of cold gas, melting gasification furnace and the reduction furnace of melting gasification furnace outlet coal gas, and remainder is as energy recovery coal gas;
Described system also comprises reduction furnace raw gas processing subsystem, and this subsystem comprises gas cooler II, bag-type dust equipment I I: described gas cooler II is used for the temperature of reduction furnace raw gas out is reduced to 150-200 ℃; Described bag-type dust equipment I I is used under the filtration velocity of 0.2 ~ 0.3m/min, coal gas being purified, and the flue dust of collecting is collected and recycled by Pneumatic conveyer;
Described system also comprises the aftertreatment subsystem, described aftertreatment subsystem comprises the TRT apparatus for energy recovery, after converging by the reduction furnace coal gas after bag-type dust equipment I I and melting gasification furnace residual gas, as satisfy the TRT power generation conditions, carry out top pressure power generation by the TRT apparatus for energy recovery, as not satisfying condition, by being connected to gaspipe network after the pressure release of by-pass valve group.
5. COREX shaft furnace coal gas dry-method bag-type dust collecting according to claim 4 and energy-recuperation system, it is characterized in that: described thick dust removal installation is hot tornado dust collector or gravitational precipitator.
6. COREX shaft furnace coal gas dry-method bag-type dust collecting according to claim 4 and energy-recuperation system, it is characterized in that: described secondary cooling apparatus is multi-stage heat-exchanger or multistage washing tower.
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| CN102260539B true CN102260539B (en) | 2013-06-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103789045B (en) * | 2014-01-21 | 2015-07-15 | 成都易态科技有限公司 | Dry-method purifying and recycling process for dry distillation gas and mixed type gas condensation device |
| CN104212930B (en) * | 2014-09-05 | 2016-06-22 | 钢研晟华工程技术有限公司 | A kind of BAOSHEREX iron-smelting process of two-step smelting molten iron |
| CN107365603A (en) * | 2017-07-30 | 2017-11-21 | 合肥徽工工业自动化工程有限公司 | A kind of shaft furnace coal gas dry-method bag-type dust collecting recovery method |
| CN108165695A (en) * | 2017-12-31 | 2018-06-15 | 新疆八钢铁股份有限公司 | Utilize the method for COREX stove treated sewages treatment plant precipitating sludge |
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|---|---|---|---|---|
| CN86103986A (en) * | 1986-06-05 | 1987-12-16 | 湖南铁合金厂 | Dry dust separation method for ferroalloy closed electrical furnace |
| CN1334320A (en) * | 2000-07-14 | 2002-02-06 | 攀枝花新钢钒股份有限公司动力厂 | Dry-type process for dusting gas of blast furnace |
| CN1793388A (en) * | 2005-11-18 | 2006-06-28 | 重庆钢铁(集团)有限责任公司 | Tech. of blast furnace gas drying bag dust removing |
| CN101200656A (en) * | 2007-11-07 | 2008-06-18 | 中冶赛迪工程技术股份有限公司 | Purifying technique for roof gas of COREX melting reducing furnace |
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2011
- 2011-07-01 CN CN 201110183759 patent/CN102260539B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103986A (en) * | 1986-06-05 | 1987-12-16 | 湖南铁合金厂 | Dry dust separation method for ferroalloy closed electrical furnace |
| CN1334320A (en) * | 2000-07-14 | 2002-02-06 | 攀枝花新钢钒股份有限公司动力厂 | Dry-type process for dusting gas of blast furnace |
| CN1793388A (en) * | 2005-11-18 | 2006-06-28 | 重庆钢铁(集团)有限责任公司 | Tech. of blast furnace gas drying bag dust removing |
| CN101200656A (en) * | 2007-11-07 | 2008-06-18 | 中冶赛迪工程技术股份有限公司 | Purifying technique for roof gas of COREX melting reducing furnace |
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