CN102071071B - Method for cooling and dedusting fluidized bed gasified raw coal gas - Google Patents
Method for cooling and dedusting fluidized bed gasified raw coal gas Download PDFInfo
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- CN102071071B CN102071071B CN 201010564507 CN201010564507A CN102071071B CN 102071071 B CN102071071 B CN 102071071B CN 201010564507 CN201010564507 CN 201010564507 CN 201010564507 A CN201010564507 A CN 201010564507A CN 102071071 B CN102071071 B CN 102071071B
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Abstract
The invention relates to a method for cooling and dedusting fluidized bed gasified raw coal gas. The method comprises the following steps: 0.1-0.5kg/Nm<3> of water is injected in coal gas in a venturi, the high temperature coal gas with water vapour passes through the venturi for pretreatment to ensure that the temperature of the coal gas reach the dew point temperature of water, the treated gas enters a packed tower washer from the bottom of the washer, water is sprayed onto filler from the top of the packed tower washer to wash and cool the treated gas, the purified coal gas is sent to a subsequent work section from the upper part of the packed tower washer, and finally sewage is discharged from the bottom of the packed tower washer. The invention has the advantages that the treatment equipment has simple structure, small floor space and high purification efficiency.
Description
Technical field
The invention belongs to a kind of method of coal gas cooling and dedusting, be specifically related to the method for a kind of fluidized bed coal gasification raw gas high efficiency cooling dedusting.
Background technology
Coal resources in China is widely distributed, coal is many, but existing gasification industrial application coal is single, ature of coal requires high, and especially low grade coal cleans and utilizes difficult present situation, and fluidized-bed gasification is fit to many coals, hard coal from brown coal to the high-order and refinery coke, dirty coal, the moisture coal that contains ash 30～50% that also can gasify need not drying, only need adjust also and can normally gasify on technique heavy caking coal, so fluidized-bed is more suitable in the high ash of China, dystectic coal.
Fluidized-bed gasification heating gas out passes through waste heat boiler, vapor superheater and de-oxygenised water preheater successively, and gas temperature at this moment is 150-250 ℃, and dustiness is 3-20g/Nm
3(median size is less than 10 μ m), water vapour content is 15%-50%, enters at last the wash cooling system, for making the demand that reaches the user from fluidized-bed coal gas of high temperature quality out, need to carry out coal gas coolingly, reduces the dustiness in coal gas.Traditional cooling purifying device mainly adopts the structure formation of efficient cyclone separator+washing tower+two an adjustable venturi washer, complex structure, and floor space is large, and is difficult to reach the requirement of coal gas essence dedusting.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structurely, floor space is little, the dedusting method of cooling that purification efficiency is high.
For achieving the above object, the method of a kind of fluidized bed coal gasification raw gas high efficiency cooling provided by the invention dedusting is: be comprised of Venturi and packing tower washer, the coal gas that high temperature contains steam first carries out pre-treatment by Venturi, Venturi sprays into certain water, makes gas temperature reach certain dew-point temperature, makes the vapor portion condensation form droplet, this droplet is far smaller than the drop that water spray forms, because the condense droplet that forms of steam self is very little, dust is reunited grow up, catch more dust.Gas after processing enters the packing tower washer, and water pours on filler from packing tower washer top spray the gas after processing is washed.Cooling, the coal gas after purification is gone to follow-up workshop section from the top of packing tower washer,, final sewage is discharged from the bottom of packing tower washer.
Concrete cooling and dedusting method of the present invention is as follows:
At Venturi with every Nm
3The water yield that coal gas sprays into 0.1～0.5kg sprays into water, the coal gas that high temperature contains steam carries out pre-treatment by Venturi, make gas temperature reach the dew-point temperature of water, gas after processing enters the packing tower washer by packing tower washer bottom, water pours on filler from packing tower washer top spray the gas after processing is washed, cooling, the coal gas after purification is gone to follow-up workshop section from the top of packing tower washer, and final sewage is discharged from the bottom of packing tower washer.
Described raw gas temperature is 150-250 ℃, and dustiness is 3-20g/Nm
3(median size is less than 10 μ m), water vapour content is 15%-50%.
High temperature after processing contains the coal gas of steam at the outlet dust content＜5mg/Nm of packing tower
3
The invention has the advantages that:
1, being fit to fluidized-bed, to contain the steam raw gas purifying cooling, do not need the external adding water steam;
2, equipment is comprised of Venturi and packing tower washer, and simple in structure, floor space is little, and is easy to operate, and investment is saved.
3, the action principle of Venturi is to utilize in raw gas vapor portion to condense to form less droplet, dust is reunited grow up, and improves efficiency of dust collection;
4, the effect of Venturi is that coal gas of high temperature is carried out pre-treatment.
Description of drawings
Fig. 1 is schematic flow sheet of the present invention.
As shown in the figure, 1-Venturi, 2-packing tower washer, 3-gas entry, 4-gas exit, 5-sewage outlet, the waterjet inlet of 6-Venturi, the spray water entrance of 7-packing tower.
Embodiment
Embodiment 1
Temperature is 180 ℃, and dustiness is 3g/Nm
3, water vapour content is 15%, and pressure is that the coal gas of 0.4Mpa carries out pre-treatment through Venturi, and the water yield that sprays into Venturi is 0.12kg/Nm
3This water yield makes gas temperature reach the dew-point temperature of water, make the vapor portion condensation form droplet, this droplet is far smaller than the drop that water spray forms, because the condense droplet that forms of steam self is very little, dust is reunited grow up, then enter packing tower and wash cooling, gas temperature drops to 40 ℃, and dust content is less than 5mg/Nm
3
Embodiment 2
Temperature is 200 ℃, and dustiness is 10g/Nm
3, water vapour content is 25%, and pressure is that the coal gas of 0.6Mpa carries out pre-treatment through Venturi, and the water yield that sprays into Venturi is 0.3kg/Nm
3This water yield makes gas temperature reach the dew-point temperature of water, make the vapor portion condensation form droplet, this droplet is far smaller than the drop that water spray forms, because the condense droplet that forms of steam self is very little, dust is reunited grow up, then enter packing tower and wash cooling, gas temperature drops to 40 ℃, and dust content is less than 5mg/Nm
3
Embodiment 3
Temperature is 250 ℃, and dustiness is 20g/Nm
3, water vapour content is 35%, and pressure is that the coal gas of 2.5Mpa carries out pre-treatment through Venturi, and the water yield that sprays into Venturi is 0.5kg/Nm
3This water yield makes gas temperature reach the dew-point temperature of water, make the vapor portion condensation form droplet, this droplet is far smaller than the drop that water spray forms, because the condense droplet that forms of steam self is very little, dust is reunited grow up, then enter packing tower and wash cooling, gas temperature drops to 40 ℃, and dust content is less than 5mg/Nm
3
Claims (1)
1. the method for a fluidized bed coal gasification raw gas cooling and dedusting, is characterized in that comprising the steps:
At Venturi with every Nm
3The water yield that coal gas sprays into 0.1～0.5kg sprays into water, the coal gas that high temperature contains steam carries out pre-treatment by Venturi, make gas temperature reach the dew-point temperature of water, gas after processing enters the packing tower washer by packing tower washer bottom, water pours on filler from packing tower washer top spray the gas after processing is washed, cooling, the coal gas after purification is gone to follow-up workshop section from the top of packing tower washer, and final sewage is discharged from the bottom of packing tower washer;
Described raw gas temperature is 150-250 ℃, and dustiness is 3-20g/Nm
3, the median size of institute's dust-laden is less than 10 μ m, and water vapour content is 15%-50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010564507 CN102071071B (en) | 2010-11-25 | 2010-11-25 | Method for cooling and dedusting fluidized bed gasified raw coal gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010564507 CN102071071B (en) | 2010-11-25 | 2010-11-25 | Method for cooling and dedusting fluidized bed gasified raw coal gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102071071A CN102071071A (en) | 2011-05-25 |
| CN102071071B true CN102071071B (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201010564507 Expired - Fee Related CN102071071B (en) | 2010-11-25 | 2010-11-25 | Method for cooling and dedusting fluidized bed gasified raw coal gas |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102690689B (en) * | 2012-06-08 | 2013-12-04 | 神华集团有限责任公司 | Device and method for scrubbing and purifying coal gas |
| CN104403702A (en) * | 2014-11-24 | 2015-03-11 | 水煤浆气化及煤化工国家工程研究中心 | Dedusting device for synthetic gas |
| CN105498425A (en) * | 2016-01-14 | 2016-04-20 | 张家港市洁皇工业吸尘器制造有限公司 | Servo linkage wet method smoke removal purification device for numerical control plasma cutting machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393284A (en) * | 2001-06-22 | 2003-01-29 | 国家电站燃烧工程技术研究中心 | Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed |
| CN201625479U (en) * | 2010-02-04 | 2010-11-10 | 安徽省元琛环保科技有限公司 | Water inflow nozzle of dust-removing venturi tube |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5518411A (en) * | 1978-07-26 | 1980-02-08 | Agency Of Ind Science & Technol | Production of gas |
| JP2000178567A (en) * | 1998-12-16 | 2000-06-27 | Hitachi Ltd | Composite coal gasification-power generation plant and purification apparatus for coal-gasified gas |
-
2010
- 2010-11-25 CN CN 201010564507 patent/CN102071071B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1393284A (en) * | 2001-06-22 | 2003-01-29 | 国家电站燃烧工程技术研究中心 | Reaction process for desulfurizing fume with integrated dual-circulation fluidized bed |
| CN201625479U (en) * | 2010-02-04 | 2010-11-10 | 安徽省元琛环保科技有限公司 | Water inflow nozzle of dust-removing venturi tube |
Non-Patent Citations (2)
| Title |
|---|
| JP昭55-18411A 1980.02.08 |
| JP特开2000-178567A 2000.06.27 |
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| CN102071071A (en) | 2011-05-25 |
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Granted publication date: 20130612 Termination date: 20181125 |