CN100482767C - Method of purifying calcium carbide furnace gas - Google Patents
Method of purifying calcium carbide furnace gas Download PDFInfo
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- CN100482767C CN100482767C CNB2006101307050A CN200610130705A CN100482767C CN 100482767 C CN100482767 C CN 100482767C CN B2006101307050 A CNB2006101307050 A CN B2006101307050A CN 200610130705 A CN200610130705 A CN 200610130705A CN 100482767 C CN100482767 C CN 100482767C
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Abstract
The invention discloses a purifying method of calcium carbide furnace gas, which comprises the following steps: (1) leading high temperature furnace gas with 150-600mg/Nm3 oil tar and 100-150g/Nm3 from calcium carbide furnace through dust pelletizing system; lowing the temperature at 225-260deg.c; (2) leading to high temperature fan; boosting pressure at 10-25KPaG; washing in water scrubber; lowing furnace temperature at 20-50 deg.c; lowing oil tar content to 1-100ppm; lowing dust content to 1-5mg/Nm3; (3)leading furnace gas from water scrubber through air collector front water-sealing, screw-type dish gas holder and air collector back water-sealing; getting the product. This can low accommodation area and investment.
Description
Technical field
The present invention relates to a kind of purifying method of calcium carbide furnace.
Background technology
The raw coke of calcium carbide production and lime produce calcium carbide under the effect of resistance arc heat, also produce a large amount of furnace gases simultaneously.Come out furnace gas temperature about 600～800 ℃ from furnace of calcium carbide, moment top temperature can reach 1000 ℃, calorific value content height.Can be used as the fuel of equipment such as raw material of wood-charcoal dry heat wind furnace, gas burning lime kiln, power plant, boiler.Make energy recovery utilize again, realize recycling economy, improve added value of product.
Calcium carbide furnace gas by volume percentage composition contains CO70～90%, H
25～7%, O
20.2 CO～0.6%,
22～5%, CH
40～5%, N
21～4%, tar 150～600mg/Nm
3, dirt 100～150g/Nm
3Has easily sticking, the easy characteristic such as stifled of high temperature, inflammable, explosive, dust.
The furnace gas that gas burning lime kiln and power plant can utilize calcium carbide production to be produced, but generally speaking, gas burning lime kiln and power plant are all distant apart from the calcium carbide production equipment distance.In addition along with the development of China's Coal Chemical Industry, maximization along with the PVC unit scale, the calcium carbide device also is tending towards maximizing, and has 10,20,30,40,50,600,000 tons/year at the calcium carbide device of building and planning to build at present, even the owner who has intends establishing 1,000,000 tons of/year calcium carbide devices.For the focus utilization calcium carbide furnace gas, guarantee the stability of furnace gas, solve remote carry and many calcium carbide burner gas such as compile at problem, just must carry out dedusting and cooling processing, so want emphasis to consider the influence of following factor to furnace gas.
1, in order to guarantee the stability of furnace gas source of the gas, need set up gas holder buffering, this inevitable requirement temperature can not be too high (general temperature≤50 ℃ be advisable).
2, when furnace gas temperature≤225 ℃, the coal-tar middle oil zero pour that reaches of furnace gas is separated out, and causes sticking burnt, the caliber of pipeline to diminish gradually, influence the furnace gas conveying.
3, if select the fuel of furnace gas, calcium carbide furnace gas is required to have good stability as gas burning kiln, and its Dust Capacity≤50mg/Nm
3
And at present, the method for flue gas cleaning mainly contains wet purification, dry cleaning and three kinds of technologies of direct combustion method, and two kinds of gas cleaner method and Venturi methods are mainly adopted in wet purification:
The gas cleaner method is that calcium carbide furnace gas is directly drained into following current washing tower and countercurrent washing tower by extracting pipe out, reduces to normal temperature through the two poles of the earth tower washing back temperature, and makes its dustiness by about 100g/Nm
3Reduce to 10g/Nm
3Below, the furnace gas after slightly washing enters gas cleaner through first water seal, carries out fine purifiation in gas cleaner, makes its dustiness reduce to 10mg/Nm
3Below, again through gas-liquid separator, remove moisture content.Furnace gas after the dehydration delivers to the user after booster fan or compressor boost or the gas holder buffering is standby.
The Venturi method be with from calcium carbide furnace gas behind heat insulation tile tube, spill box, following current washing tower, countercurrent washing tower, shower, Venturi tube, switching water seal, tubulent contact tower, standby by delivering to gas holder buffering after the blower fan supercharging.This method furnace gas temperature is reduced to room temperature from about 600～800 ℃, and the furnace gas dustiness is from 100～150g/Nm
3Reduce to 50mg/Nm
3Below.
More than two kinds of wet purification methods all be that direct water is reduced to normal temperature for 600～800 ℃ with furnace gas temperature, and carry out dedusting, decoking oil treatment, though can both purify furnace gas, because of furnace gas mainly relies on the turbid circulating water cooling, the temperature difference is bigger, and water consumption is bigger.The accurate calcium carbide of calcium carbide furnace gas water loss signature is about 40m
3/ t calcium carbide.
Summary of the invention
A kind of purifying method of calcium carbide furnace comprises the steps: that (1) will contain tar 150～600mg/Nm from what furnace of calcium carbide came out
3, dust 100～150g/Nm
3High-temperature furnace gas by after the dust-removal system, make temperature reduce to 225～260 ℃; (2) furnace gas after will lowering the temperature boosts to 10～25KPaG through high-temperature blower, sends into the water wash column washing, makes furnace gas temperature reduce to that 20～50 ℃, tar content are reduced to 1～100ppm, dust content is reduced to 1～5mg/Nm
3(3) will be from the furnace gas after the water wash column washing, pass through water seal behind water seal before the gas holder, spiral wet gasholder, the gas holder successively, make purifying calcium carbide furnace gas.
Described dust-removal system preferably is made up of second cyclone dust extractor, blower fan, three grades of sack cleaners, and described high-temperature furnace gas is successively by second cyclone dust extractor, blower fan, three grades of sack cleaners.
Method of the present invention can make waste water dust-laden mud amount low, contains cryanide ion (CN
-) low, water loss is low, has therefore reduced the floor space and the investment of sewage disposal.Simultaneously because present method makes dirt mud and CN in the waste water
-All fewer, waste water can be by adding flocculation agent after the settling bowl sedimentation, and clear liquid is used the recycle of pumped back water wash column again, realizes zero release.Dirt mud and tar adopt separating centrifuge regularly to handle in the dense liquid, and the dust-laden mud after the processing and the mud of tar operate material of construction or burning outward, contain CN
-Waste water regularly send sewage work to handle, the expense of quantity of wastewater effluent and sewage disposal is reduced greatly.
Description of drawings
Fig. 1 is a purifying calcium carbide furnace gas feel flow draw of block of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiment and accompanying drawing.
Embodiment 1
A kind of purifying method of calcium carbide furnace comprises the steps: that (1) will contain tar 150～600mg/Nm from what furnace of calcium carbide came out
3, dust 100～150g/Nm
3High-temperature furnace gas by after the dust-removal system, make temperature reduce to 225 ℃ (dry method dusts), dust-removal system is made up of second cyclone dust extractor, blower fan, three grades of sack cleaners, high-temperature furnace gas passes through second cyclone dust extractor, blower fan, three grades of sack cleaners successively; (2) furnace gas after will lowering the temperature boosts to 10KPaG through high-temperature blower, sends into the water wash column washing, makes furnace gas temperature reduce to that 20 ℃, tar content are reduced to 1～100ppm, dust content is reduced to 1～5mg/Nm
3(wet purification); (3) will be from the furnace gas after the water wash column washing, pass through water seal behind water seal before the gas holder, spiral wet gasholder, the gas holder successively, make purifying calcium carbide furnace gas.Purifying calcium carbide furnace gas is selected to send the user after compressor or the supercharging blower supercharging according to the length of distance.Contain tar, dirt mud, CN
-The ionic washes send sewage device to handle.
Purifying calcium carbide furnace gas flow process of the present invention is seen Fig. 1.
Embodiment 2
A kind of purifying method of calcium carbide furnace comprises the steps: that (1) will contain tar 150～600mg/Nm from what furnace of calcium carbide came out
3, dust 100～150g/Nm
3High-temperature furnace gas by after the dust-removal system, make temperature reduce to 260 ℃, dust-removal system is made up of second cyclone dust extractor, blower fan, three grades of sack cleaners, high-temperature furnace gas passes through second cyclone dust extractor, blower fan, three grades of sack cleaners successively; (2) furnace gas after will lowering the temperature boosts to 25KPaG through high-temperature blower, sends into the water wash column washing, makes furnace gas temperature reduce to that 50 ℃, tar content are reduced to 1～100ppm, dust content is reduced to 1～5mg/Nm
3(3) will be from the furnace gas after the water wash column washing, pass through water seal behind water seal before the gas holder, spiral wet gasholder, the gas holder successively, make purifying calcium carbide furnace gas.Purifying calcium carbide furnace gas is selected to send the user after compressor or the supercharging blower supercharging according to the length of distance.Contain tar, dirt mud, CN
-The ionic washes send sewage device to handle.
Embodiment 3
A kind of purifying method of calcium carbide furnace comprises the steps: that (1) will contain tar 150～600mg/Nm from what furnace of calcium carbide came out
3, dust 100～150g/Nm
3High-temperature furnace gas by after the dust-removal system, make temperature reduce to 240 ℃, dust-removal system is selected conventional dust-removal system for use; (2) furnace gas after will lowering the temperature boosts to 20KPaG through high-temperature blower, sends into the water wash column washing, makes furnace gas temperature reduce to that 35 ℃, tar content are reduced to 1～100ppm, dust content is reduced to 1～5mg/Nm
3(3) will be from the furnace gas after the water wash column washing, pass through water seal behind water seal before the gas holder, spiral wet gasholder, the gas holder successively, make purifying calcium carbide furnace gas.Purifying calcium carbide furnace gas is selected to send the user after compressor or the supercharging blower supercharging according to the length of distance.Contain tar, dirt mud, CN
-The ionic washes send sewage device to handle.
Because method of the present invention preferentially adopts the dust-removal system of second cyclone dust extractor, blower fan, three grades of sack cleaners, the dust content 100～150g/Nm that will come out from furnace of calcium carbide earlier
3Reduce to≤50mg/Nm
3, furnace gas enters water wash column again and purifies, and makes dust content reduce to 1～5mg/Nm
3, method waste water dust-laden mud amount of the present invention only accounts for gas cleaner method or Venturi method about 0.05%; , because most cyanide ion (CN
-) with Ca (CN)
2Form come out with dust separation, the waste water that washing is come out contains CN
-Far below adopting complete gas cleaner method or Venturi method technology.
Because dust and CN in method water loss of the present invention, the turbid circulating water
-All low more than above two kinds of wet purification technologies, reduced the floor space and the investment of sewage disposal so to a great extent.Simultaneously owing to dirt mud and CN in the processing wastewater of the present invention
-All fewer, waste water can be by adding flocculation agent after the settling bowl sedimentation, and clear liquid is used the recycle of pumped back water wash column again, realizes zero release.Dirt mud and tar adopt separating centrifuge regularly to handle in the dense liquid, and the dust-laden mud after the processing and the mud of tar operate material of construction or burning outward, contain CN
-Waste water regularly send sewage work to handle, the expense of quantity of wastewater effluent and sewage disposal is reduced greatly.
Method of the present invention adopts the accurate calcium carbide of water wash column purification water loss signature to be about 8m
3/ t calcium carbide, this method water loss are little more a lot of than complete wet purification far away, and it is abundanter to be suitable for northern electric resources, and the area that water resources relatively lacks.
Claims (2)
1. purifying method of calcium carbide furnace is characterized in that comprising the steps: that (1) will contain tar 150～600mg/Nm from what furnace of calcium carbide came out
3, dust 100～150g/Nm
3High-temperature furnace gas by after the dust-removal system, make temperature reduce to 225～260 ℃; (2) furnace gas after will lowering the temperature boosts to 10～25KPaG through high-temperature blower, sends into the water wash column washing, makes furnace gas temperature reduce to that 20～50 ℃, tar content are reduced to 1～100ppm, dust content is reduced to 1～5mg/Nm
3(3) will be from the furnace gas after the water wash column washing, pass through water seal behind water seal before the gas holder, spiral wet gasholder, the gas holder successively, make purifying calcium carbide furnace gas.
2. a kind of purifying method of calcium carbide furnace according to claim 1, it is characterized in that described dust-removal system is made up of second cyclone dust extractor, blower fan, three grades of sack cleaners, described high-temperature furnace gas is successively by second cyclone dust extractor, blower fan, three grades of sack cleaners.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006101307050A CN100482767C (en) | 2006-12-29 | 2006-12-29 | Method of purifying calcium carbide furnace gas |
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|---|---|---|---|
| CNB2006101307050A CN100482767C (en) | 2006-12-29 | 2006-12-29 | Method of purifying calcium carbide furnace gas |
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| CN100482767C true CN100482767C (en) | 2009-04-29 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627280B (en) * | 2011-07-14 | 2014-02-12 | 西南化工研究设计院 | Method for purifying and concentrating CO from calcium carbide furnace gas |
| CN102382689B (en) * | 2011-08-09 | 2013-12-11 | 中国天辰工程有限公司 | Positive-pressure dry dust removing and purifying method for calcium carbide furnace gas |
| CN104324730B (en) * | 2012-12-28 | 2016-08-17 | 汤燕 | A kind of catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN103182232B (en) * | 2013-03-21 | 2015-10-28 | 新疆天业（集团）有限公司 | The processing method of micro-dust in a kind of calcium carbide stove exhaust |
| CN108262328A (en) * | 2016-12-31 | 2018-07-10 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | A kind of calcium carbide precipitator dust processing system |
| CN112705000A (en) * | 2020-12-30 | 2021-04-27 | 恒力石化（大连）炼化有限公司 | Calcium carbide furnace tail gas comprehensive utilization system and process |
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