CN102258923A - Method for recycling and reusing tail gas of calcium carbide furnace - Google Patents

Method for recycling and reusing tail gas of calcium carbide furnace Download PDF

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Publication number
CN102258923A
CN102258923A CN2011101106688A CN201110110668A CN102258923A CN 102258923 A CN102258923 A CN 102258923A CN 2011101106688 A CN2011101106688 A CN 2011101106688A CN 201110110668 A CN201110110668 A CN 201110110668A CN 102258923 A CN102258923 A CN 102258923A
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CN
China
Prior art keywords
tail gas
gas
cooling
calcium carbide
temperature
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Application number
CN2011101106688A
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Chinese (zh)
Inventor
蒋远华
刘晓
李先军
谭培义
李俊
易春雨
丁勇
袁文科
钟鹤岩
张凤英
浮玉宁
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青海宜化化工有限责任公司
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Priority to CN2011101106688A priority Critical patent/CN102258923A/en
Publication of CN102258923A publication Critical patent/CN102258923A/en

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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The invention relates to the technical field of chemical industry and particularly relates to a method for recycling and reusing tail gas of a calcium carbide furnace in the clean production of calcium carbide industry. The method provided by the invention comprises the following steps: 1) cooling the tail gas, and controlling the temperature of the tail gas; 2) cooling through a cooler; 3) dedusting; 4) pressurizing and delivering; 5) drying carbon balls; and 6) exhausting the tail gas. The method provided by the invention has the following beneficial effects: after being initially cooled through a water cooled wall flue, the high-temperature furnace gas of the calcium carbide furnace enters the cooler and a cyclone cooling dust collector to be cooled; simultaneously, large-particle dust in the gas is collected; and after being delivered to a bag-type dust collector to be purified and dedusted, the gas is pressurized by a pressurization fan and delivered to a gas burning kiln system to be used as fuel. The regenerated tail gas produced after burning is introduced into a powdered carbon molding and drying system to dry carbon materials; and the moisture containing coke is reduced by about 7%. Thus, the heat of the tail gas of the calcium carbide furnace is fully and completely used; and finally, the tail gas is dedusted before being exhausted in accordance with the standards, thereby completely recycling and utilizing the calcium carbide furnace gas.

Description

A kind of calcium carbide stove exhaust recycling method

Technical field

The present invention relates to chemical technology field, specifically relate to the calcium carbide stove exhaust recycling method in the cleaner production of calcium carbide industry.

Background technology

Though adopted closed calcium carbide furnace to add the measure that waste heat boiler is recycled process heat in the existing technological process, but, calcium carbide contains a large amount of dust particles because producing in the tail gas, and do not consider its particularity in the boiler structure that uses the at present design, the burner hearth clogging often takes place in the production, causing present waste heat boiler utilization rate is 0, the tail gas that furnace of calcium carbide produces does not utilize serious waste resource and pollution of ecological environment all by the emptying of furnace of calcium carbide burner hearth gas chimney.

Summary of the invention

The technical problem to be solved in the present invention is the deficiency that exists at prior art, and the method for the calcium carbide stove exhaust recycling in the cleaner production of a kind of calcium carbide industry is provided.

A kind of calcium carbide stove exhaust recycling of the present invention method is achieved by following technical proposals: a kind of calcium carbide stove exhaust recycling method is characterized in that described method comprises the steps:

1) tail gas cooling and temperature controlling step thereof

Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 240-280 ℃;

By regulating axial flow blower operating number control cold blast rate on the air blast cooling device, realize temperature control, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, the nitrogen auxiliary temperature-reducing can be mixed,, processing can be diffused if temperature still transfinites; Conveyance conduit is taked insulation after the dedusting;

2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 200 ℃~260 ℃;

3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;

4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;

5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;

6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.

A kind of calcium carbide stove exhaust recycling of the present invention method has following beneficial effect compared with prior art: what produce in the furnace of calcium carbide of the present invention contains carbon monoxide fuel gas up to about 70, with its high-temperature furnace gas after the water-cooling wall flue tentatively cools, enter cooler, whirlwind cooling and dedusting device is cooled to 200 ℃~260 ℃, simultaneously with oarse-grained trapping dust in the gas, after delivering to the sack cleaner purifying and dedusting, after the booster fan pressurization, deliver to the gas burning kiln system and do the fuel use.The regeneration tail gas access powdered carbon shaping and drying system that the burning back produces carries out the oven dry to raw material of wood-charcoal, makes the moisture content that contains coke descend about 7%, this tail gas heat quantity with furnace of calcium carbide is made full use of fully, at last by qualified discharge after the dedusting.

Calcium carbide furnace gas is all recycled, and it is 3545Nm that a furnace of calcium carbide produces furnace gas 3/ h, the furnace gas amount of eight furnaces of calcium carbide is 28360Nm 3/ h, the calcium carbide furnace gas calorific capacity is 2600kcal/Nm 3, eight furnaces of calcium carbide can utilize heat 5.90 * 10 11The heat 5.81 * 10 that provides when coke acts as a fuel is provided kcal/a fully 11Kcal/a.Remaining calcium carbide furnace gas is as the thermal source of oven dry charcoal ball in the technological transformation of powdered carbon forming energy-saving, remaining heat 9 * 10 9Kcal/a can provide the powdered carbon moulding oven dry heat 2.5 * 10 that workshop section needs fully 9Kcal/a, powdered carbon moulding oven dry heat Calculation is as follows:

81325 tons of charcoal balls of annual production need by 10% heat Calculation that be evaporated to 3% needs be the moisture of charcoal ball: (81325 * (10%-3%) * 4.183KJ/Kg. ℃ * 120 ℃+81325 * 93% * 0.836 KJ/Kg. ℃ * 120 ℃)/80%=10.4 * 10 9KJ/a=2.5 * 10 9Kcal/a.

The energy-saving effect of the inventive methodExhaust gas purification system increases power consumption 2470kw * 8000h=19760000kwh/a newly, signature coal 1,976 ten thousand kwh/a * 0.35kgce/kWh=6916 ton/year.

System coke consumption in limekiln is O, the annual coke 8.55 * 10 of saving 4T/a, signature coal 85500t/a * 0.9714tce/t=83054.7 ton/year.Power consumption is constant.

This plant modification saving mark coal is 83054.7-6916=76138.7 ton/year.

Description of drawings

A kind of calcium carbide stove exhaust recycling of the present invention method has following accompanying drawing:

Fig. 1 is a prior art calcium carbide technological process of production sketch;

Fig. 2 is a kind of calcium carbide stove exhaust recycling of the present invention method process chart.

The specific embodiment

Below in conjunction with drawings and Examples a kind of calcium carbide stove exhaust recycling of the present invention method and technology scheme is further described.

As shown in Figure 2, a kind of calcium carbide stove exhaust recycling of the present invention method comprises the steps:

1) tail gas cooling and temperature controlling step thereof

Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 240-280 ℃;

By regulating axial flow blower operating number control cold blast rate on the air blast cooling device, between 2 * 8=16 platform, regulate the control of realization temperature according to axial flow blower platform number on the calcium carbide stove exhaust adjustment air blast cooling device, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, can mix the nitrogen auxiliary temperature-reducing, mixing the nitrogen method is to feed nitrogen in the bottom of filter, and the amount of participating in is decided according to temperature; If temperature still transfinites, can diffuse processing, the method for diffusing is carried out block clearing and deashing for stopping cleaning procedure; Conveyance conduit utilization skin twines heat-preservation cotton and is incubated after the dedusting;

2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 200 ℃~260 ℃;

3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;

4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;

5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;

6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.

Embodiment 1.

A kind of calcium carbide stove exhaust recycling of the present invention method comprises the steps:

1) tail gas cooling and temperature controlling step thereof

Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 240 ℃;

By regulating axial flow blower operating number 2 * 4=8 platform control cold blast rate on the air blast cooling device, the control of realization temperature, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, can mix the nitrogen auxiliary temperature-reducing, if temperature still transfinites, can diffuse processing; Conveyance conduit is incubated after the dedusting;

2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 200 ℃;

3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;

4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;

5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;

6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.

Embodiment 2.

A kind of calcium carbide stove exhaust recycling of the present invention method comprises the steps:

1) tail gas cooling and temperature controlling step thereof

Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 260 ℃;

By regulating axial flow blower operating number 2 * 5=10 platform control cold blast rate on the air blast cooling device, the control of realization temperature, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, can mix the nitrogen auxiliary temperature-reducing, if temperature still transfinites, can diffuse processing; Conveyance conduit is incubated after the dedusting;

2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 230 ℃;

3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;

4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;

5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;

6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.

Embodiment 3.

A kind of calcium carbide stove exhaust recycling of the present invention method comprises the steps:

1) tail gas cooling and temperature controlling step thereof

Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 280 ℃;

By regulating axial flow blower operating number 2 * 8=16 platform control cold blast rate on the air blast cooling device, the control of realization temperature, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, can mix the nitrogen auxiliary temperature-reducing, if temperature still transfinites, can diffuse processing; Conveyance conduit is incubated after the dedusting;

2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 260 ℃;

3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;

4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;

5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;

6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.

Claims (1)

1. a calcium carbide stove exhaust recycling method is characterized in that described method comprises the steps:
1) tail gas cooling and temperature controlling step thereof
Tail gas adopts the two-stage cooling, adopts water cold sleeve that flue-gas temperature is reduced to below 450 ℃ earlier, enters air blast cooling device indirect heat exchange then and makes exhaust temperature reduce to 240-280 ℃;
By regulating axial flow blower operating number control cold blast rate on the air blast cooling device, realize temperature control, temperature will be lower than 280 ℃ to protect filter bag, to be higher than 240 ℃ to avoid tar to separate out, if flue gas overtemperature, the nitrogen auxiliary temperature-reducing can be mixed,, processing can be diffused if temperature still transfinites; Conveyance conduit is taked insulation after the dedusting;
2) the cooler cooling step delivers into whirlwind cooling and dedusting device with the tail gas of the preliminary cooling of step 1) and cools to 200 ℃~260 ℃;
3) dust removal step will be through step 2) oarse-grained trapping dust in the cooled tail gas, deliver to the sack cleaner purifying and dedusting;
4) tail gas after the pressurized delivered step purifies dust removal step is delivered to gas burning kiln and is done the fuel use after the booster fan pressurization;
5) the regeneration tail gas access powdered carbon shaping and drying system of charcoal ball drying steps burning back generation dries raw material of wood-charcoal, makes the moisture content of charcoal ball descend about 7%;
6) the exhaust emissions step makes full use of complete back by discharging after the dedusting with the tail gas heat quantity of furnace of calcium carbide.
CN2011101106688A 2011-04-29 2011-04-29 Method for recycling and reusing tail gas of calcium carbide furnace CN102258923A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102653403A (en) * 2012-05-17 2012-09-05 五冶集团成都节能工程技术服务有限公司 Process method for preparing calcium carbide by recycling calcium carbide slag
CN102654357A (en) * 2012-05-17 2012-09-05 五冶集团成都节能工程技术服务有限公司 Tail gas recycling system for calcium carbide furnace and application method thereof
CN102703133A (en) * 2012-05-08 2012-10-03 鹤壁煤电股份有限公司电石厂 New technology for recycling coal tar of calcium carbide furnace gas
CN102719280A (en) * 2012-07-10 2012-10-10 内蒙古宜化化工有限公司 Calcium carbide furnace gas purifying method
CN102745647A (en) * 2012-06-20 2012-10-24 青海宜化化工有限责任公司 Process for producing hydrogen from natural gas by using calcium carbide tail gas
CN103305653A (en) * 2013-06-19 2013-09-18 交城义望铁合金有限责任公司 System for recycling raw coke oven gas of manganous slag-rich electric furnace and process for recycling raw coke oven gas
CN103638757B (en) * 2013-12-13 2015-05-20 中国天辰工程有限公司 High temperature ejector
CN104874253A (en) * 2015-05-29 2015-09-02 北京华福神雾工业炉有限公司 Calcium carbide furnace tail gas dry dedusting, waste heat recovery and synthesis gas production device
CN105060294A (en) * 2015-07-20 2015-11-18 常州市好利莱光电科技有限公司 Method for purifying and recovering CO in tail gas of calcium carbide furnace
CN106925064A (en) * 2017-03-24 2017-07-07 宁夏瑞银有色金属科技有限公司 A kind of sedimentation process in vertical air-cooled multitube sedimentation tower
CN108344175A (en) * 2017-12-23 2018-07-31 云南乾程科技开发有限公司 A kind of method that combustion furnace smoke heat energy complete utilization obtains hot wind
CN110763037A (en) * 2019-11-05 2020-02-07 盐边县向阳钒业有限公司 Tail gas treatment method and device for vanadium-based alloy rotary kiln production line and application of tail gas treatment method and device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611119C2 (en) * 1996-03-21 2001-05-23 Sueddeutsche Kalkstickstoff Process for cleaning hot, dusty and tarry exhaust gases
CN101045193A (en) * 2006-12-18 2007-10-03 青海东胜化工有限公司 Drytype process for purifying tail gas from calcium carbide production furnace
CN201285050Y (en) * 2008-08-12 2009-08-05 南京苏冶钙业技术有限公司 Tail gas combustion utilization apparatus for calcium carbide furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19611119C2 (en) * 1996-03-21 2001-05-23 Sueddeutsche Kalkstickstoff Process for cleaning hot, dusty and tarry exhaust gases
CN101045193A (en) * 2006-12-18 2007-10-03 青海东胜化工有限公司 Drytype process for purifying tail gas from calcium carbide production furnace
CN201285050Y (en) * 2008-08-12 2009-08-05 南京苏冶钙业技术有限公司 Tail gas combustion utilization apparatus for calcium carbide furnace

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102703133A (en) * 2012-05-08 2012-10-03 鹤壁煤电股份有限公司电石厂 New technology for recycling coal tar of calcium carbide furnace gas
CN102653403A (en) * 2012-05-17 2012-09-05 五冶集团成都节能工程技术服务有限公司 Process method for preparing calcium carbide by recycling calcium carbide slag
CN102654357A (en) * 2012-05-17 2012-09-05 五冶集团成都节能工程技术服务有限公司 Tail gas recycling system for calcium carbide furnace and application method thereof
CN102653403B (en) * 2012-05-17 2014-10-15 五冶集团成都节能工程技术服务有限公司 Process method for preparing calcium carbide by recycling calcium carbide slag
CN102745647A (en) * 2012-06-20 2012-10-24 青海宜化化工有限责任公司 Process for producing hydrogen from natural gas by using calcium carbide tail gas
CN102719280A (en) * 2012-07-10 2012-10-10 内蒙古宜化化工有限公司 Calcium carbide furnace gas purifying method
CN103305653A (en) * 2013-06-19 2013-09-18 交城义望铁合金有限责任公司 System for recycling raw coke oven gas of manganous slag-rich electric furnace and process for recycling raw coke oven gas
CN103638757B (en) * 2013-12-13 2015-05-20 中国天辰工程有限公司 High temperature ejector
CN104874253A (en) * 2015-05-29 2015-09-02 北京华福神雾工业炉有限公司 Calcium carbide furnace tail gas dry dedusting, waste heat recovery and synthesis gas production device
CN104874253B (en) * 2015-05-29 2017-10-13 洪阳冶化工程科技有限公司 A kind of calcium carbide furnace tail gas dry process dedusting-waste heat recovery-production synthesizes device of air
CN105060294A (en) * 2015-07-20 2015-11-18 常州市好利莱光电科技有限公司 Method for purifying and recovering CO in tail gas of calcium carbide furnace
CN106925064A (en) * 2017-03-24 2017-07-07 宁夏瑞银有色金属科技有限公司 A kind of sedimentation process in vertical air-cooled multitube sedimentation tower
CN108344175A (en) * 2017-12-23 2018-07-31 云南乾程科技开发有限公司 A kind of method that combustion furnace smoke heat energy complete utilization obtains hot wind
CN110763037A (en) * 2019-11-05 2020-02-07 盐边县向阳钒业有限公司 Tail gas treatment method and device for vanadium-based alloy rotary kiln production line and application of tail gas treatment method and device

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