CN102011605B - Low-concentration gas and ventilation air methane thermal oxidation generating system and method of coal mine - Google Patents
Low-concentration gas and ventilation air methane thermal oxidation generating system and method of coal mine Download PDFInfo
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- CN102011605B CN102011605B CN201010501852A CN201010501852A CN102011605B CN 102011605 B CN102011605 B CN 102011605B CN 201010501852 A CN201010501852 A CN 201010501852A CN 201010501852 A CN201010501852 A CN 201010501852A CN 102011605 B CN102011605 B CN 102011605B
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Abstract
The invention relates to low-concentration gas and ventilation air methane thermal oxidation generating system and method of a coal mine. The system mainly comprises a multi-gas oxidation device, a water treatment device, a screw rod type expander, a generator, a condenser and the like. In the method, low-concentration gas and ventilation air methane of the coal mine are adopted to carry out periodic reciprocating flowing type superheated oxidation reaction in a porous ceramic oxidation bed, the reaction heat is extracted with work medium water through an internal heat exchanger, generated superheated vapor enters the screw rod type expander to do work, and the heat energy is converted to the mechanical energy to drive the generator to generate the power. The system and the method have the advantages of simpleness, reasonable single machine capacity matching, convenience in operation and good use effect.
Description
Technical field
The present invention relates to a kind of coal mine light concentration mash gas and air-lack mash gas thermal oxidation electricity generation system and method, be particularly useful for coal mine gas is carried out oxidation and reaction heat carried out the conversion of high efficiency thermoelectric.
Background technology
In China's conventional energy resource constitutes, about 5.57 trillion tons of coal resources total amount, underground 2000m is with about 30～35,000,000,000,000 m of interior gas (coal bed gas) stock number
3, effectively exploit and utilize coal and gas resources to highlight day by day in the developing critical role of Chinese national economy.Gas is a kind of and coal association, non-renewable resource, and gas also is a kind of cleaning, the energy efficiently simultaneously, and its calorific value can reach 33.5～36.8MJ/m
3, 1m
3Gas is equivalent to the calorific value of 1.3kg standard coal, and it utilizes process can not produce hazardous substancess such as oxynitrides and sulfide.
The coal seam of China more than 50% is high gas layer, and the gas total amount that discharged in the China's coal-mine manufacturing process in 2009 surpasses 15,000,000,000 m
3, but nearly 2/3 gas has then directly entered atmosphere with the form of weary wind, has both wasted the energy resources of a large amount of preciousnesses, has also polluted atmospheric environment.More importantly be, the greenhouse effect of gas (coal bed gas) are 21 times of carbon dioxide, are CO to the destruction of ozone layer
27 times.According to reducing discharging the power purchasing price in the present World Trade Organization, at present in field, international carbon foreign currency market, the CER of carbon per ton can be sold 85 yuans, annual 15000000000 m
3The reduction of discharging of gas and utilization can obtain the income of 17,000,000,000 RMB.Along with the enforcement of " reply weather conversion country scheme ", the energy-saving and emission-reduction problem of China has become the grand strategy task of present stage.Therefore, coal mine gas is the comprehensive utilization of ventilation air gas particularly, not only can aspect gas utilization, obtain direct economic well-being of workers and staff, can aspect energy-saving and emission-reduction, obtain abundant repayment again.
That the utilization of coal mine gas mainly comprises is civilian, generating, industry and chemical fuel, combustion gas vehicle etc., and wherein CMM Power Generation is the mainstream development direction that coal mine gas utilizes.At present, for the CMM Power Generation technology of middle and high concentration (＞30%), comparative maturity; Low concentration CMM Power Generation technology for 10%～30%; Shandong is won moving group and is adopted the internal combustion generator group to carry out certain work; Carried out pilot study in the part mining area, however, at present most mining area is main with emptying still to the gas of this concentration range; And for concentration 1%～10% coal mine light concentration mash gas in addition concentration less than 1% coal mine wind-lack gas generation technology, still belong to blank at present.
Because the characteristics of coal mine light concentration mash gas and ventilation air gas (air quantity is big, gas density is low and fluctuation range big), make conventional combustion techniques particularly how to produce high-grade electric energy aspect and have big difficulty.So coal mine light concentration mash gas (≤30%) and ventilation air gas (≤1%) are used for generating electricity still being unrealized so far and use on a large scale.
Summary of the invention
Technical problem: the objective of the invention is to overcome the deficiency in the prior art, a kind of system architecture is simple, the single-machine capacity coupling is reasonable, easy to operate, effective coal mine light concentration mash gas and air-lack mash gas thermal oxidation electricity generation system and method are provided.
Technical scheme: coal mine light concentration mash gas of the present invention and air-lack mash gas thermal oxidation electricity generation system, the inlet and outlet device that comprise methane oxidized apparatus, is connected respectively with methane oxidized apparatus, circular water treating system and the screw decompressor that links to each other with generator; Wherein: methane oxidized apparatus comprises that porous ceramics oxidation bed, spaced and parallel are arranged in a plurality of built-in heat exchanger of porous ceramics oxidation bed top and the bottom; The middle part of porous ceramics oxidation bed is provided with at least one oxidation bed and starts heater, and the port of a plurality of built-in heat exchangers is connected with the screw decompressor with the circular water treating system drum through pipeline respectively; The inlet and outlet device comprises respectively attendes the air inlet and exhaust piper that lower air chamber is connected with the porous ceramics oxidation bed, connect respectively on the air inlet and exhaust piper give, the bleed blower fan, send, the bleed blower fan links to each other with ventilation air methane oxidized apparatus through four-way change-over valve; The described water treatment circulating system comprises drum, the storage tank that links to each other with drum feed pump pipeline; Be connected with the condensing apparatus that links to each other with the screw decompressor, the hydrotreater that links to each other with feed pump on the storage tank respectively; Be connected with the drum feed pump on storage tank and the pipeline that drum links to each other, the drum outlet is led on the pipeline of a built-in heat exchanger and is connected with built-in heat exchanger circulating water pump.
Described screw decompressor is single-screw decompressor or double-screw type decompressor; Described condensing apparatus is air-cooled or water cooled condenser.
Coal mine light concentration mash gas of the present invention and air-lack mash gas thermal oxidation electricity-generating method: first heater starts the porous ceramics oxidation bed; The coal mine light concentration mash gas and the ventilation air gas of extraction are sent in the porous ceramics oxidation bed after the ventilator pressurization by blast pipe; Through the control four-way change-over valve; Coal mine light concentration mash gas and ventilation air gas gas are back and forth flowed in porous ceramics oxidation bed intercycle property concurrently gave birth to the enthalpy oxidation reaction, move continuously thereby keep the methane oxidized apparatus self-stabilization; The high-temperature gas that oxidation produces is discharged from stack by air-introduced machine after built-in heat exchanger extracts heat; Working-medium water after the feed pump pressurization is introduced in the storage tank after water treatment facilities is handled earlier; After the water pump pressurization, get into the drum of porous ceramics oxidation bed again; Feedwater gets in the built-in heat exchanger under the effect of built-in heat exchanger circulating water pump; The steam that is produced separates the further overheated screw decompressor that gets into again in back through drum carbonated drink and expands and do work in pipeline gets into drum, is mechanical energy with thermal power transfer; Drive generator and generate electricity, the working-medium water after the acting is back to storage tank with recycle after condenser condenses.
Beneficial effect:
1, adopts the porous ceramics oxidation bed as oxidation reactor, not only can effectively realize the enthalpy oxidation excessively of coal mine light concentration mash gas and ventilation air gas, also effectively expanded coal mine gas from keeping the concentration limit of stablizing oxidation reaction;
2, with the device of the less screw decompressor of single-machine capacity as heat energy and mechanical energy conversion; Can realize the effective and reasonable coupling of energy conversion device and gas oxidation bed, avoided that traditional steam turbines single-machine capacity is excessive, system architecture is complicated and with not the matching of low concentration coal mine gas oxidation unit.
3, the system condensing device both can adopt water-cooled, also can adopt air-cooled, the selection that can suit measures to local conditions; Can adopt the mode of recycle as the water of working medium medium, effectively practice thrift and utilize water resource.
Description of drawings
Accompanying drawing is a system construction drawing of the present invention;
Among the figure: 1-air inlet pipe, 2-stack, 3-ventilator, 4.-air-introduced machine, 5-four-way change-over valve; 6-porous ceramics oxidation bed, the built-in heat exchanger of 7.-, 8.-drum, 9-screw decompressor; The 10-generator, 11-condensing apparatus, 12-feed pump, 13-hydrotreater; The 14-storage tank, 15-drum feed pump, the built-in heat exchanger circulating water pump of 16-, the 17-oxidation bed starts heater.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are done further to describe:
Shown in the accompanying drawing; Coal mine light concentration mash gas and air-lack mash gas thermal oxidation electricity generation system mainly are made up of methane oxidized apparatus, the inlet and outlet device that is connected with methane oxidized apparatus respectively, circular water treating system and the screw decompressor 9 that links to each other with generator 10; Wherein: methane oxidized apparatus comprises that porous ceramics oxidation bed 6, spaced and parallel are arranged in a plurality of built-in heat exchanger 7 of porous ceramics oxidation bed 6 top and the bottom; The middle part of porous ceramics oxidation bed 6 is provided with at least one oxidation bed and starts heater 17; The port of a plurality of built-in heat exchangers 7 is connected with screw decompressor 9 with circular water treating system drum 8 through pipeline respectively, and screw decompressor 9 adopts single-screw decompressor or double-screw type decompressor.Porous ceramics oxidation bed 6 is used for the oxidation of coal mine light concentration mash gas and ventilation air gas and the extraction of oxidation heat, and screw decompressor 9 is used for the conversion of heat energy and mechanical energy and drives generator 10 generating electricity.The inlet and outlet device comprises respectively attendes the air inlet and exhaust piper 1,2 that lower air chamber is connected with porous ceramics oxidation bed 6; Connect respectively on the air inlet and exhaust piper 1,2 give, bleed blower fan 3,4, send, bleed blower fan 3,4 links to each other with ventilation air methane oxidized apparatus through four-way change-over valve 5; The described water treatment circulating system comprises drum 8, the storage tank 14 that links to each other with drum feed pump pipeline; Be connected with the condensing apparatus 11 that links to each other with screw decompressor 9, the hydrotreater 13 that links to each other with feed pump 12 on the storage tank 14 respectively, condensing apparatus 11 adopts air-cooled or water cooled condenser.Be connected with drum feed pump 15 on storage tank 14 and the pipeline that drum 8 links to each other, drum 8 outlets are led on the pipeline of a built-in heat exchanger 7 and are connected with built-in heat exchanger circulating water pump 16.Hydrotreater 13 and feed pump 12, drum feed pump 15 and built-in heat exchanger circulating water pump 16 are used for the working media water purification and are implemented in intrasystem circulation.
Coal mine light concentration mash gas and air-lack mash gas thermal oxidation electricity-generating method: adopt coal mine light concentration mash gas and ventilation air gas in porous ceramics oxidation bed 6, to carry out the reciprocal mobile enthalpy oxidation reaction of crossing of periodicity; Reaction heat is extracted through built-in heat exchanger 7 by working medium water; The superheated steam that produced gets into screw decompressor 9 and does work, and thermal power transfer is mechanical energy and drives generator and generate electricity.During work; Elder generation's heater 17 starts porous ceramics oxidation bed 6; The coal mine light concentration mash gas and the ventilation air gas of extraction are sent in the porous ceramics oxidation bed 6 after ventilator 3 pressurizations by blast pipe 1; Through control four-way change-over valve 5, coal mine light concentration mash gas and ventilation air gas gas are back and forth flowed in porous ceramics oxidation bed 6 intercycle property concurrently gave birth to the enthalpy oxidation reaction, move continuously thereby keep the methane oxidized apparatus self-stabilization; The high-temperature gas that oxidation produces is discharged from stack 2 by air-introduced machine 4 after built-in heat exchanger 7 extracts heat; Feedwater as working medium gets into storage tank 14 earlier by feed pump 12 after water treatment facilities 13 is handled; Get into the drum 8 of porous ceramics oxidation bed 6 again by 15 pressurizations of drum feed pump; Working-medium water gets into the built-in heat exchanger 7 of porous ceramics oxidation bed 6 under the effect of built-in heat exchanger circulating water pump 16; The steam that is produced is separated by the steam-water separators in the drum 8 after further overheatedly get into screw decompressor 9 acting of expanding again; With thermal power transfer is mechanical energy, generates electricity thereby drive generator 10, and the steam after the acting is back to storage tank 14 with recycle after condensing apparatus 11 condensations.
Claims (4)
1. coal mine light concentration mash gas and air-lack mash gas thermal oxidation electricity generation system is characterized in that: it comprises ventilation air methane oxidized apparatus, inlet and outlet device, the circular water treating system that is connected with ventilation air methane oxidized apparatus respectively and the screw decompressor (9) that links to each other with generator; Wherein: ventilation air methane oxidized apparatus comprises that porous ceramics oxidation bed (6), spaced and parallel are arranged in a plurality of built-in heat exchanger (7) of porous ceramics oxidation bed (6) top and the bottom; The middle part of porous ceramics oxidation bed (6) is provided with at least one oxidation bed and starts heater (17), and the port of a plurality of built-in heat exchangers (7) is connected with screw decompressor (9) with circular water treating system drum (8) through pipeline respectively; The inlet and outlet device comprises respectively attendes the air inlet and exhaust piper (1,2) that lower air chamber is connected with porous ceramics oxidation bed (6); Connect respectively on the air inlet and exhaust piper (1,2) give, bleed blower fan (3,4), send, bleed blower fan (3,4) links to each other with ventilation air methane oxidized apparatus through four-way change-over valve (5); Described circular water treating system comprises drum (8), the storage tank (14) that links to each other with drum feed pump pipeline; Be connected with the condensing apparatus (11) that links to each other with screw decompressor (9), the hydrotreater (13) that links to each other with feed pump (12) on the storage tank (14) respectively; Be connected with drum feed pump (15) on storage tank (14) and the pipeline that drum (8) links to each other, drum (8) outlet is led on the pipeline of a built-in heat exchanger (7) and is connected with built-in heat exchanger circulating water pump (16).
2. coal mine light concentration mash gas according to claim 1 and air-lack mash gas thermal oxidation electricity generation system is characterized in that: described screw decompressor (9) is single-screw decompressor or double-screw type decompressor.
3. coal mine light concentration mash gas according to claim 1 and air-lack mash gas thermal oxidation electricity generation system is characterized in that: described condensing apparatus (11) is air-cooled or water cooled condenser.
4. the coal mine light concentration mash gas and the air-lack mash gas thermal oxidation electricity-generating method of system according to claim 1; It is characterized in that: open oxidation bed earlier and start heater (17) startup porous ceramics oxidation bed (6); The coal mine light concentration mash gas and the ventilation air gas of extraction are sent in the porous ceramics oxidation bed (6) after conveying gas blower (3) pressurization by air inlet pipe (1); Through control four-way change-over valve (5); Coal mine light concentration mash gas and ventilation air gas gas are back and forth flowed in porous ceramics oxidation bed (6) intercycle property concurrently gave birth to the enthalpy oxidation reaction, move continuously thereby keep the ventilation air methane oxidized apparatus self-stabilization; The high-temperature gas that oxidation produces is discharged from stack (2) by bleed blower fan (4) after built-in heat exchanger (7) extracts heat; Working-medium water after feed pump (12) pressurization is introduced in the storage tank (14) after hydrotreater (13) is handled earlier; After drum feed pump (15) pressurization, get into the drum (8) of porous ceramics oxidation bed (6) again; Feedwater gets in the built-in heat exchanger (7) under the effect of built-in heat exchanger circulating water pump (16); The steam that is produced separates the further overheated screw decompressor (9) that gets into again in back through drum (8) carbonated drink and expands and do work in pipeline gets into drum (8), is mechanical energy with thermal power transfer; Drive generator (10) and generate electricity, the working-medium water after the acting is back to storage tank (14) with recycle after condensing apparatus (11) condensation.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102913890A (en) * | 2012-10-31 | 2013-02-06 | 中国矿业大学 | Pulsation porous medium combustion power generation system |
Families Citing this family (6)
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| CN103643986B (en) | 2013-11-21 | 2015-07-15 | 中国矿业大学 | Integrated device for synergetic oxidation of low-concentration gas and ventilation gas of self-backheating coal mine |
| CN104500158B (en) * | 2014-12-02 | 2016-09-07 | 中国矿业大学 | A kind of low concentration coal-bed gas or gas electricity system |
| CN104492229A (en) * | 2014-12-25 | 2015-04-08 | 华能国际电力股份有限公司 | Pithead power plant low-cost carbon dioxide trapping system and pithead power plant low-cost carbon dioxide trapping method |
| CN107489468A (en) * | 2017-09-18 | 2017-12-19 | 贵州盘江煤层气开发利用有限责任公司 | A kind of low-concentration gas power generation system based on intermittent combustion |
| CN109519942A (en) * | 2018-12-11 | 2019-03-26 | 武汉理工大学 | A kind of accurate self-preheating type safety and energy-saving Regenerative Combustion System and method |
| CN113750686B (en) * | 2021-09-15 | 2023-01-17 | 贵州正升科技股份有限公司 | Coal mine gas full-utilization integrated system |
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| CN2905204Y (en) * | 2006-03-14 | 2007-05-30 | 胜利油田胜利动力机械有限公司 | VAM methane oxidation apparatus |
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| CN201835858U (en) * | 2010-09-27 | 2011-05-18 | 中国矿业大学 | Thermal oxidation generating system by adopting low-concentration gas and ventilated gas in coal mine |
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| JPH04101005A (en) * | 1990-08-13 | 1992-04-02 | Mitsubishi Heavy Ind Ltd | Steam turbine type power generator |
| US6612830B2 (en) * | 2001-08-10 | 2003-09-02 | Precision Combustion, Inc. | Anode gas burner for inert gas generation, method and apparatus |
| US8133298B2 (en) * | 2007-12-06 | 2012-03-13 | Air Products And Chemicals, Inc. | Blast furnace iron production with integrated power generation |
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Patent Citations (3)
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|---|---|---|---|---|
| CN2905204Y (en) * | 2006-03-14 | 2007-05-30 | 胜利油田胜利动力机械有限公司 | VAM methane oxidation apparatus |
| CN101505120A (en) * | 2009-03-06 | 2009-08-12 | 大连海事大学 | Mine ventilation counter flow oxidation thermo-electric generation system |
| CN201835858U (en) * | 2010-09-27 | 2011-05-18 | 中国矿业大学 | Thermal oxidation generating system by adopting low-concentration gas and ventilated gas in coal mine |
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Cited By (1)
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| CN102913890A (en) * | 2012-10-31 | 2013-02-06 | 中国矿业大学 | Pulsation porous medium combustion power generation system |
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