CN102303876A - Method for mixed burning of natural gas and calcium carbide furnace gas - Google Patents
Method for mixed burning of natural gas and calcium carbide furnace gas Download PDFInfo
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- CN102303876A CN102303876A CN201110134620A CN201110134620A CN102303876A CN 102303876 A CN102303876 A CN 102303876A CN 201110134620 A CN201110134620 A CN 201110134620A CN 201110134620 A CN201110134620 A CN 201110134620A CN 102303876 A CN102303876 A CN 102303876A
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- calcium carbide
- gas
- carbide furnace
- furnace gas
- sweet natural
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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Abstract
The invention discloses a method for mixed burning of natural gas and calcium carbide furnace gas, which uses a filter, a front pressure-relieving valve, a rear pressure-relieving valve, an on-site controller, a remote control system, a combustion furnace, a molten salt furnace, an air preheater, a final concentrator and a molten salt tank, which are connected in turn. By researching and developing a method for mixed burning of natural gas and calcium carbide furnace gas in a process step for producing caustic soda in pearl by evaporating solution of sodium hydroxide, the problem of comprehensive utilization of furnace gas generated in a closed calcium carbide furnace is solved, the calcium carbide furnace gas resource is effectively used, natural gas resource is saved, and the pollution of calcium carbide furnace gas to the environment is avoided effectively. The method can be widely used in a production process using natural gas as fuel, particularly a process step for producing solid caustic soda by evaporating the solution of sodium hydroxide.
Description
Technical field:
The present invention relates to the method for a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion, particularly be applicable to sodium hydroxide solution is evaporated in the operation of producing solid caustic soda.
Background technology:
Tiancheng Chemical Co., Ltd. belongs to 400,000 tons of polyvinyl chloride projects of Xingjiang Tianye Co. (group) 1,200,000 tons of associatings chemical industry first phase; Company has introduced the single cover of two covers production capacity and has reached 150,000 tons/year large-scale caustic soda prilling granulator in 2007; Main production concentration is 99%～99.5% grain alkali; This device adopts advanced falling film evaporation production technique; Its evaporation concentration system is respectively by 1st effective evaporator; 2nd effect evaporator; Rise membrane concentrator; Final thickener and five unit of flash evaporator are formed; Imitate through one; Two imitate and rise film processing back concentration sodium hydroxide is increased to 72%～73% by 32%～32.5%; Be evenly distributed with some low-carbon nickel material falling liquid film pipes in the final thickener; Concentration is that 72%～73% molten sodium hydroxide is heat-transfer medium with the fused salt in the falling liquid film pipe; Fused salt adopts the mixture (HTS) of nitrate, and it consists of 40% NaNO
2, 7% NaNO
3With 53% KNO
3Fusing point is 142.2 ℃; Fused salt in the fused salt storage tank gets into molten salt furnace through pump for liquid salts; Fused salt is that fuel is heated to 400～430 ℃ with the Sweet natural gas in molten salt furnace; Fused salt gets into the fused salt pipeline from molten salt furnace; With concentration in the falling liquid film pipe be that 72%～73% alkali lye countercurrent flow is conducted heat; The molten concentration sodium hydroxide is increased to more than 98%～98.5% by 72%～73% the most at last; 1 ton of sodium hydroxide of every production (concentration is 98%～98.5%) consumes the about 64 mark sides of Sweet natural gas; Calculate by 300,000 tons of production capacities, the annual Sweet natural gas that consumes reaches 1,920 ten thousand mark sides.
Supporting 640,000 tons of/year calcium carbide factories of Tiancheng Chemical Co., Ltd. adopt fully-closed furnace of calcium carbide, the about 400m of every production 1 ton of calcium carbide by-product furnace gas
3, furnace gas main component: CO is 80%～85%, CO
2Be 1%～3%, H
2Be 7%～10%, N
2Be 6%～8%, O
2Be 0.07%～0.3%, tar is 1.5%～2% etc., fuel value is 1900～2700kcal/Nm3, calcium carbide furnace gas be through can realizing comprehensive utilization after purifying, and becomes the auxiliary and substitute energy of Sweet natural gas.
Summary of the invention:
The invention solves the calcium carbide furnace gas that produces because of the fully-closed furnace of calcium carbide in the prior art can't realize comprehensive utilization and cause environmental pollution problems; And then a kind of method that Sweet natural gas and calcium carbide furnace gas can be carried out multifuel combustion is provided; To save gas consumption, avoid calcium carbide furnace gas that environment is polluted simultaneously.
The technical scheme that the present invention adopts is: the method for a kind of Sweet natural gas of the present invention and calcium carbide furnace gas double fuel multifuel combustion; Comprise the strainer that links to each other successively, preceding reducing valve, back reducing valve, field controller, tele-control system, burner, molten salt furnace, air preheater, final thickener, fused salt jar; In sodium hydroxide solution being evaporated the operation of producing grain alkali; Send into the final concentrator unit of evaporation concentration system behind furnace gas process dust-removal system that closed calcium carbide furnace produces and the filter cleaning; Furnace gas filters before getting into burner pipeline reducing valve group once more; Furnace gas after the filtration is handled the back through reducing valve group and Controlling System and is got into burner by a certain percentage with suitable pressure and flow and Sweet natural gas and burn, and the required fresh air that burns is by the air preheater supply; Fused salt in the fused salt jar gets into molten salt furnace by pump for liquid salts; Fused salt gas mixture with Sweet natural gas and calcium carbide furnace gas in molten salt furnace is that fuel is heated to 400～430 ℃; The molten sodium hydroxide of delivering to final thickener and 73% then carries out heat exchange, and the molten concentration sodium hydroxide is increased to 98%～98.5% by 72%～73%.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion; Burner and fuel oil atomizer to the Sweet natural gas burner are transformed; Installed the furnace gas nozzle additional in Sweet natural gas burner nozzle; And strict spacing and the potential difference that keeps furnace gas nozzle and Sweet natural gas nozzle, cause damage to avoid high temperature sintering to burner and nozzle.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion; In the burner of Sweet natural gas burner and nozzle transformation, be provided with special furnace gas import and corresponding furnace gas pipeline; And according to getting in the burner the desired process control parameter of furnace gas reducing valve and field controller have been installed, to guarantee to get into stablizing of furnace gas pressure and flow in the burner.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion has been installed furnace gas component on-Line Monitor Device at the furnace gas pipeline, and the furnace gas component is monitored in real time, so that regulate furnace gas flow and pressure, guarantees that system thermal is stable.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion; The burner Controlling System is transformed; Set up Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion Controlling System, and be provided with corresponding combustion mode according to the different ratios of Sweet natural gas in the propellant combination and calcium carbide furnace gas.
The method of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion in described a kind of the alkali production process through two kinds of fuel air ratios are calculated, is transformed existing burner blower, to guarantee the supply of air under the dual fuel.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion; Plenum system is changed into by arresting flexible and controllable such as separate electrical motor and electric elements system by the solid mechanical system, under different ratios multifuel combustion pattern, switch flexibly to guarantee Sweet natural gas and calcium carbide furnace gas.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion is installed oxygen on-line monitoring appearance, and safety interlock is set on the furnace gas admission line, when oxygen content automatic emptying of furnace gas greater than 0.3% time, to avoid hidden peril of explosion.
The method of described a kind of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion is installed fire retardant device on the burner admission line, the burner system safety operation is guaranteed in the tempering that possibly cause when avoiding the burner combustion mode to switch.
The present invention studies and uses through calcium carbide furnace gas and natural gas double-fuel mixed combustion technique that the fully-closed furnace of calcium carbide is produced; Solved the difficult problem of Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion; Not only save natural gas source, and effectively avoided the calcium carbide furnace gas pollution on the environment.It is in the production process of fuel that the present invention can be widely used in the Sweet natural gas, particularly is applicable to sodium hydroxide solution is evaporated in the operation of producing solid caustic soda.
Description of drawings:
Fig. 1 is the embodiments of the invention process flow sheet;
Among Fig. 1: 1 is that strainer, 2 is that reducing valve, 4 was that field controller, 5 is that tele-control system, 6 is that burner, 7 is that molten salt furnace, 8 is that air preheater, 9 is that final thickener, 10 is the fused salt jar after preceding reducing valve, 3 was;
Specific embodiments:
With reference to accompanying drawing 1, present embodiment comprises strainer 1, preceding reducing valve 2, back reducing valve 3, field controller 4, tele-control system 5, burner 6, molten salt furnace 7, air preheater 8, final thickener 9, the fused salt jar 10 that links to each other successively; In sodium hydroxide solution being evaporated the operation of producing grain alkali; Send into the final concentrator unit of evaporation concentration system behind furnace gas process dust-removal system that calcium carbide factory's closed calcium carbide furnace produces and the filter cleaning; Furnace gas filters before getting into burner pipeline reducing valve group once more; Furnace gas after the filtration is handled the back through reducing valve group and Controlling System and is got into burner by a certain percentage with suitable pressure and flow and Sweet natural gas and burn, and the required fresh air that burns is by the air preheater supply; Fused salt in the fused salt jar gets into molten salt furnace by pump for liquid salts; Fused salt gas mixture with Sweet natural gas and calcium carbide furnace gas in molten salt furnace is that fuel is heated to 400～430 ℃; The molten sodium hydroxide of delivering to final thickener and 72%～73% then carries out heat exchange, and the molten concentration sodium hydroxide is increased to 98%～98.5% by 72%～73%.
Another embodiment difference is that the Sweet natural gas volume fraction is 60% in the double fuel gas mixture in Sweet natural gas and the calcium carbide furnace gas double fuel multifuel combustion pattern, and the calcium carbide furnace gas volume fraction is 40%;
Another embodiment difference is that the Sweet natural gas volume fraction is 50% in the double fuel gas mixture in Sweet natural gas and the calcium carbide furnace gas double fuel multifuel combustion pattern, and the calcium carbide furnace gas volume fraction is 50%;
Another embodiment difference is that the Sweet natural gas volume fraction is 30% in the double fuel gas mixture in Sweet natural gas and the calcium carbide furnace gas double fuel multifuel combustion pattern, and the calcium carbide furnace gas volume fraction is 70%;
Another embodiment difference is that the Sweet natural gas volume fraction is 0% in the double fuel gas mixture in Sweet natural gas and the calcium carbide furnace gas double fuel multifuel combustion pattern, and the calcium carbide furnace gas volume fraction is 100%.
Claims (6)
1. the method for Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion is characterized in that: comprise the strainer that links to each other successively, preceding reducing valve, back reducing valve, field controller, tele-control system, burner, molten salt furnace, air preheater, final thickener, fused salt jar; In sodium hydroxide solution being evaporated the operation of producing grain alkali; Send into the final concentrator unit of evaporation concentration system behind furnace gas process dust-removal system that closed calcium carbide furnace produces and the filter cleaning; Furnace gas filters before getting into burner pipeline reducing valve group once more; Furnace gas after the filtration is handled the back through reducing valve group and Controlling System and is got into burner by a certain percentage with suitable pressure and flow and Sweet natural gas and burn, and the required fresh air that burns is by the air preheater supply; Fused salt in the fused salt jar gets into molten salt furnace by pump for liquid salts; Fused salt gas mixture with Sweet natural gas and calcium carbide furnace gas in molten salt furnace is that fuel is heated to 400～430 ℃; The molten sodium hydroxide of delivering to final thickener and 73% then carries out heat exchange, and the molten concentration sodium hydroxide is increased to 98%～98.5% by 72%～73%.
2. according to the method for claims 1 described Sweet natural gas and calcium carbide furnace gas double fuel multifuel combustion, it is characterized in that: calcium carbide furnace gas filters through strainer before getting into burner pipeline reducing valve once more.
3. according to the method for claims 2 described Sweet natural gases and calcium carbide furnace gas double fuel multifuel combustion, it is characterized in that: the calcium carbide furnace gas after filtering once more carries out step-down through reducing valve before getting into burner.
4. according to the method for claims 3 described Sweet natural gases and calcium carbide furnace gas double fuel multifuel combustion, it is characterized in that: reducing valve is connected with the field controller of control calcium carbide furnace gas flow.
5. according to the method for claims 4 described Sweet natural gases and calcium carbide furnace gas double fuel multifuel combustion, it is characterized in that: field controller is connected with the tele-control system of control Sweet natural gas and calcium carbide furnace gas double fuel combustion mode.
6. according to the method for claims 5 described Sweet natural gases and calcium carbide furnace gas double fuel multifuel combustion; It is characterized in that: Sweet natural gas and calcium carbide furnace gas double fuel combustion mode are that the Sweet natural gas volume fraction is 60% in a. double fuel gas mixture; The calcium carbide furnace gas volume fraction is 40%, the Sweet natural gas volume fraction is 50% in the b. double fuel gas mixture; The calcium carbide furnace gas volume fraction is 50%, the Sweet natural gas volume fraction is 30% in the c. double fuel gas mixture; The calcium carbide furnace gas volume fraction be 70% or d. double fuel gas mixture in the Sweet natural gas volume fraction be 0%, the calcium carbide furnace gas volume fraction is 100%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110134620A CN102303876A (en) | 2011-05-24 | 2011-05-24 | Method for mixed burning of natural gas and calcium carbide furnace gas |
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|---|---|---|---|
| CN201110134620A CN102303876A (en) | 2011-05-24 | 2011-05-24 | Method for mixed burning of natural gas and calcium carbide furnace gas |
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| CN102303876A true CN102303876A (en) | 2012-01-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277810A (en) * | 2013-06-03 | 2013-09-04 | 滨化集团股份有限公司 | Control device for molten salt furnace in solid sodium hydroxide production |
| CN103759546A (en) * | 2014-01-21 | 2014-04-30 | 新疆中泰矿冶有限公司 | Calcium carbide furnace purification ash back-to-furnace combustion system |
| CN104324730A (en) * | 2012-12-28 | 2015-02-04 | 邓世碧 | Catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN105258152A (en) * | 2015-10-27 | 2016-01-20 | 宜宾海丰和锐有限公司 | Composite firing process for natural gas and surplus hydrogen from HCL synthesis device |
| CN105480989A (en) * | 2015-12-18 | 2016-04-13 | 攀枝花钢企欣宇化工有限公司 | Method for producing sodium hydroxide solution with concentration of 48% under low-pressure steam |
| CN106362650A (en) * | 2016-10-11 | 2017-02-01 | 东华工程科技股份有限公司 | Skid-mounted fused salt pre-mixing and salt dissolving system |
| CN113292046A (en) * | 2021-05-27 | 2021-08-24 | 青海盐湖镁业有限公司 | Comprehensive recycling process of coke oven gas in metal magnesium integrated project |
Citations (2)
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| CN2866467Y (en) * | 2006-05-09 | 2007-02-07 | 许增辉 | Continuous caustic soda evaporation equipment |
| CN201110562Y (en) * | 2007-08-27 | 2008-09-03 | 李继红 | Ignition device |
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2011
- 2011-05-24 CN CN201110134620A patent/CN102303876A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2866467Y (en) * | 2006-05-09 | 2007-02-07 | 许增辉 | Continuous caustic soda evaporation equipment |
| CN201110562Y (en) * | 2007-08-27 | 2008-09-03 | 李继红 | Ignition device |
Non-Patent Citations (1)
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| 邵玉民: "电石炉尾气的综合利用", 《中国石油和化工标准与质量》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104324730A (en) * | 2012-12-28 | 2015-02-04 | 邓世碧 | Catalyst for calcium carbide furnace gas deoxidation and preparation method thereof |
| CN103277810A (en) * | 2013-06-03 | 2013-09-04 | 滨化集团股份有限公司 | Control device for molten salt furnace in solid sodium hydroxide production |
| CN103759546A (en) * | 2014-01-21 | 2014-04-30 | 新疆中泰矿冶有限公司 | Calcium carbide furnace purification ash back-to-furnace combustion system |
| CN105258152A (en) * | 2015-10-27 | 2016-01-20 | 宜宾海丰和锐有限公司 | Composite firing process for natural gas and surplus hydrogen from HCL synthesis device |
| CN105480989A (en) * | 2015-12-18 | 2016-04-13 | 攀枝花钢企欣宇化工有限公司 | Method for producing sodium hydroxide solution with concentration of 48% under low-pressure steam |
| CN106362650A (en) * | 2016-10-11 | 2017-02-01 | 东华工程科技股份有限公司 | Skid-mounted fused salt pre-mixing and salt dissolving system |
| CN113292046A (en) * | 2021-05-27 | 2021-08-24 | 青海盐湖镁业有限公司 | Comprehensive recycling process of coke oven gas in metal magnesium integrated project |
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Application publication date: 20120104 |