CN103912891A - Coal-fired boiler combustion system with participant mixture of drainage gas and ventilation gas - Google Patents
Coal-fired boiler combustion system with participant mixture of drainage gas and ventilation gas Download PDFInfo
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- CN103912891A CN103912891A CN201410117814.3A CN201410117814A CN103912891A CN 103912891 A CN103912891 A CN 103912891A CN 201410117814 A CN201410117814 A CN 201410117814A CN 103912891 A CN103912891 A CN 103912891A
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Abstract
The invention provides a coal-fired boiler combustion system with participant mixture of drainage gas and ventilation gas. Ventilation flow generated in a mine reflow shaft is pumped by a ventilator to enter a draught fan near a coal-fired power plant along a ventilation passage; the ventilation flow is guided by the draught fan to enter a boiler inflow passage; a drainage gas passage leads to a ventilation flow passage; the start end of the drainage gas passage is provided with a drainage gas pump; the drainage gas pump pumps the drainage gas into the drainage gas passage; the drainage gas flows into the ventilation flow passage along the drainage gas passage, mixes with the ventilation flow in the ventilation flow passage and flows to the draught fan. The system has the advantages that the drainage gas is mixed into the ventilation gas or diluted to safety concentration before participating in combustion, the defect that the concentration of the ventilation gas is deficient generally is overcome, surplus gases, such as low-concentration drainage gas and gas unit gas difficult to utilize, are utilized to the maximum extent, combustion conditions of the boiler in the power plant are improved, and economic and social benefits are significantly improved.
Description
Technical field
The present invention relates to the mixed ventilation air gas of a kind of mash gas extraction ginseng and participate in coal-fired boiler combustion system.
Background technology
In progress of coal mining, a large amount of methane gas of containing in coal seam often can pour in digging space.For guaranteeing to exploit safety and administer gas, need to adopt mine ventilation to get rid of mine gas.Like this, a large amount of gas will, along with mine ventilation is discharged to atmosphere, in the valuable gas energy of waste, also can cause serious atmosphere pollution.
Particularly, coal resources in China is compared with horn of plenty, but most coalfield belongs to high gas coalfield, and coal-bed gas gas permeability is poor.According to current technology, mine gas extraction utilization rate is lower.Therefore, most gas is drained in atmosphere in mine ventilation mode.And gas bearing capacity in quite a few mine air-lack stream is between 0.5%-0.75%, wearyly contain a large amount of gas in distinguished and admirable.
In addition, in mine, for administering gas exceeding limit, also often take gas pumping measure.Gas pumping mainly comprises that this coal seam is taken out in advance, adjacent layer mode, goaf mode, for solving the especially fully-mechanized mining working local gas problem (as Air return corner gas exceeding limit) that transfinites of coal-face, goaf mash gas extraction is because its quantities is less, cost is low, solve Air return corner gas exceeding limit successful, adapt to the needs that mine comprehensive mining machineryization advances fast and adopted in a large number by mine.The gas of goaf extraction is due to gas density low (most of between 3%-8%), (generally speaking this part gas be difficult to be utilized, it is 9.5% left and right that low-concentration gas power generation requires gas optium concentration, gas electricity ability below 8% will be very little, gas density can not maintain unit operation lower than 6% time), be generally all directly discharged in atmosphere.
And in reality, because gas very easily burns, if make gas participate in burning, will significantly improve coal burning performance in the time of coal burning, gas combustion can also produce amount of heat, when saving is coal-fired, also can reduce the gas amount to airborne release.This will produce great economic interests.Therefore, be necessary to design a kind of system and device that safely mine mash gas extraction and ventilation air gas is participated in to coal-fired boiler combustion, to realize mash gas extraction and weary distinguished and admirable middle gas participates in combustion power generation.
Fig. 1 illustrates that mine air-lack stream gas of the prior art participates in the system of steam power plant's coal-fired boiler combustion.As shown in Figure 1, this system comprises that weary airflow channel, air quantity regulate mouth, methane explosion prevention system.Weary airflow channel one side connects main fan in mine air outlet, and opposite side connects steam power plant's air-introduced machine entrance.Air quantity regulates the position of mouth to determine according to mine air-lack amount and coal-burning boiler air quantity, and as weary air quantity is greater than steam power plant's air quantity, air quantity regulates mouth to be located near main fan in mine air outlet; As weary air quantity is less than steam power plant's air quantity, air quantity regulates mouth to be located near steam power plant's air-introduced machine air intake vent.In this system, mine air-lack is extracted out behind ground through main fan in mine, and the weary airflow channel arranging through ground flows near the air-introduced machine of coal-burning power plant pithead, then sends into coal-fired boiler in power plant by air-introduced machine.
The defect of above-mentioned existing scheme is:
1, said system adopts weary distinguished and admirable participation coal-fired boiler combustion, and weary distinguished and admirable gas density is less, and effect of coal saving is not obvious.In recent years along with country and the further attention of coal mining enterprise to mine safety, gas preventing and control work has almost become the cardinal task of Safety of Coal Mine Production, mine ventilation capacity is constantly strengthened, the total return air gas density of national regulation mine is no more than 0.75%, exploiting field return airway gas density is no more than 1%, for example, and some comparatively strict coal mining enterprises even require gas density lower (being no more than 0.8%), like this, in the total return of mine, gas density is difficult to exceed 0.5%, and when ventilation air gas participates in burning, its concentration still has the space of lifting.
2, the part gas of extraction is because concentration is compared with low and can not be applied by combustion gas unit, cause most of gas of extraction or all gas have no idea to utilize, can only be by directly emptying.Coal mine gas drainage pumping plant or mash gas extraction emptying system are generally located near mine return air well head, greatly from the low concentration gas below 8% of goaf extraction or the goaf gas of extraction, due in most time section concentration lower than 8% by all emptying.
3, the near coal-mine power plant in considerable colliery is Gangue Power Plant, and because ature of coal is bad, power plant soot unit operation is difficulty comparatively, and the cleaned coal ratio of blending is quite large, and existing scheme does not realize maximization to improving boiler combustion situation.
Summary of the invention
The invention provides the mixed ventilation air gas of a kind of mash gas extraction ginseng and participate in coal-fired boiler combustion system, the gas utilization rate while being intended to improve to greatest extent boiler of power plant burning, and improve the economic and social benefits.
Particularly, the invention provides the mixed ventilation air gas of a kind of mash gas extraction ginseng and participate in coal-fired boiler combustion system, wherein, what in mine return air vertical, produce weary distinguished and admirablely enters near air-introduced machine coal-burning power plant along weary airflow channel under the pumping of ventilation blower, and under the guiding of air-introduced machine, enter inlet air of boiler passage, mash gas extraction passage imports weary airflow channel, at the initiating terminal of mash gas extraction passage, mash gas extraction pump is set, mash gas extraction passage is entered in mash gas extraction pumping by mash gas extraction pump, mash gas extraction imports weary airflow channel along mash gas extraction passage, lead to described air-introduced machine with after weary distinguished and admirable mixing in weary airflow channel.
Preferably, the intersection between mash gas extraction passage and weary airflow channel arranges gas disperser, for mash gas extraction and weary distinguished and admirable mixing.
More preferably, described gas disperser adopts the mode that many discharge mouths of pipe are evenly arranged in passage section.
More preferably, near described gas disperser, fence is set.
Preferably, gas monitor probe is set in mash gas extraction passage and/or weary airflow channel, to detect gas density, and Monitoring Data is uploaded in monitoring system computer.
Preferably, in described mash gas extraction passage, electric valve for pipeline door is set, according to mixing after gas concentration automatic regulating valve door aperture, keep mixing after gas concentration in special ratios, in the time mixing after gas concentration lower than special ratios, automatically intensifying valve aperture is until standard-sized sheet, in the time that mixing after gas concentration is greater than described special ratios, reduces valve opening to reduce gas density.
Preferably, mash gas extraction is also set in mash gas extraction passage and regulates mouth, so that unnecessary gas is discharged smoothly.
More preferably, regulate a mouthful inlet air flow side that a water seal fire arrestor is installed at mash gas extraction delivery side of pump side and gas, to guarantee the safety of mash gas extraction passage and fire-proof and explosion-proof.
The present invention mash gas extraction is sneaked in ventilation air gas or be diluted to safe concentration after participate in boiler combustion, overcome the general not enough shortcoming of ventilation air gas concentration, utilize to greatest extent the gas more than needed such as part low concentration mash gas extraction and gas combustion gas unit that is difficult to be utilized simultaneously, improve power plant's (especially Gangue Power Plant) Combustion Operation of Boilers, strengthen gangue utilization degree, significantly improved economic benefit and social benefit.
Accompanying drawing explanation
Fig. 1 illustrates that mine air-lack stream gas of the prior art participates in the system of steam power plant's coal-fired boiler combustion;
Fig. 2 illustrates the system that participates in coal-fired boiler combustion according to the mixed ventilation air gas of mash gas extraction ginseng of the present invention.
The specific embodiment
Hereinafter, identical Reference numeral refers to identical element.
The present invention considers to adopt the mine air-lack mash gas of the gas of extraction being sneaked into the burning of participation thermal power plant boiler by pipeline distinguished and admirable, a logical participation burning.Like this, in making full use of mine air-lack stream, also the mash gas extraction of high concentration be diluted to below safety value and be used, having improved gas utilization rate, having improved boiler of power plant fired coal combustion performance.
Fig. 2 illustrates the system that participates in coal-fired boiler combustion according to the mixed ventilation air gas of mash gas extraction ginseng of the present invention.As shown in Figure 2, in mine return air vertical 1, the weary distinguished and admirable of generation enters near the air-introduced machine 8 coal-burning power plant along weary airflow channel under the pumping of ventilation blower 2, and under the guiding of air-introduced machine 8, enters thermal power plant boiler air intake passage 10.Air quantity can be set on weary airflow channel and regulate mouth 4, for regulating weary distinguished and admirable air quantity.Especially, in the time that weary distinguished and admirable air quantity is greater than steam power plant and uses air quantity, air quantity regulates mouthfuls 4 to be located near ventilation blower 2; In the time that weary distinguished and admirable air quantity is less than steam power plant and uses air quantity, air quantity regulates mouthfuls 4 to be located near air-introduced machine 8.
In addition, as shown in Figure 2, another air channel-mash gas extraction passage also imports weary airflow channel.At the initiating terminal of mash gas extraction passage, mash gas extraction pump 11 is set, mash gas extraction pump 11 by extraction to gas pump send mash gas extraction passage to, mash gas extraction imports weary airflow channel along mash gas extraction passage, leads near the air-introduced machine 8 coal-burning power plant with after weary distinguished and admirable mixing in weary airflow channel.
Preferably, can gas disperser 15 be set the intersection between mash gas extraction passage and weary airflow channel, the mode that for example can adopt many discharge mouths of pipe to be evenly arranged in passage section, as forms such as four mouths of pipe, five mouths of pipe or nine mouths of pipe, is beneficial to mash gas extraction and weary distinguished and admirable mixing.Meanwhile, can consider that near gas disperser 15 (for example weather side 5 meters to the scope of 30 meters of downwind sides) arranges fence 18,19, to forbid that personnel enter, guarantees Field Force's safety.
In addition, in order effectively to monitor Gas Flow situation in pipeline, gas monitor probe 16,17 can also be set in mash gas extraction passage and/or weary airflow channel, with the total return air of monitoring mine, mash gas extraction and mixing after gas concentration.Probe 17 can be arranged on downwind side fence 18 places of disperser 15, upload the data in monitoring system computer, and monitoring system can gather gas density in the total return air of mine and extraction pipeline simultaneously.
Electric valve for pipeline door 14 also can be set in mash gas extraction passage, this valve 14 is the motor regulated valve of automatically controlling, according to mixing after gas concentration automatic regulating valve door aperture, for example keep mixing after gas concentration, in special ratios (0.75% or 1%, preferably 1%).In the time mixing after gas concentration for example, lower than special ratios (, 1%), intensifying valve aperture is until standard-sized sheet, in the time that mixing after gas concentration is greater than described special ratios, reduces valve opening to reduce gas density automatically.In the time that gas density in the total return air of mine exceedes another special ratios (being enough to be considered as Mine Gas Gushing abnormal), automatic-closing valve.Electrically operated valve 14 can have manual mode, so that guarantee can manual-lock under abnormal conditions.
In weary distinguished and admirable explosion protection system, in the time that weary distinguished and admirable middle gas density exceedes 1%, power plant's fan power is cut off in monitoring probe indication automatically, prevent gas accident, weary wind can all regulate a mouthful discharge by air quantity, and open as early as possible near the air door 3 ventilation blower, to reduce flowing resistance, keep mine normally to ventilate.
Mash gas extraction also can be set in mash gas extraction passage and regulate mouth 13, so that unnecessary gas is discharged smoothly.For guaranteeing that gas can preferentially all enter weary airflow channel, gas disperser 15 should have enough negative pressure (this negative pressure is provided by steam power plant's air-introduced machine conventionally), by negative pressure by the gas suction passage in pipeline, blast can be set if desired in weary airflow channel and regulate facility, for example at the fence place of gas disperser 15 weather sides, damper 3 is set, to guarantee negative pressure.
In addition,, for emptying pipe ponding effectively, mash gas extraction threeway exhaust-valve 12 can also be set on mash gas extraction passage.In the time of electrically operated valve 14 standard-sized sheet in mash gas extraction passage, in mash gas extraction threeway exhaust-valve 12, should be negative pressure, negative pressure value generally can be 50Pa left and right.
Preferably, for guaranteeing mash gas extraction channel security and fire-proof and explosion-proof, can regulate mouthful 13 inlet air flow sides that water seal fire arrestor 20,21 is installed at the outlet side of mash gas extraction pump 11 and gas.It is also conceivable that simultaneously on pipeline, along distance, sprayer unit 5 is equidistantly installed, gas is carried out to mist and send explosion-proof.The installation of water seal fire arrestor should be as far as possible near entrance or outlet, and like this, the installation site of mash gas extraction adjusting mouth 13 and electrically operated valve 14 will be near respective channel, and concrete installation site is to facilitate installation, operation and to safeguard and be advisable.
Because mash gas extraction flow is carried with pipeline compared with little being convenient to, when return air pit shaft far away or cannot construct to carry ventilation air gas due to orographic condition restriction time apart from steam power plant, can carry separately mash gas extraction near steam power plant's air-introduced machine, increase again subsequently one section of air-supply passage and dilute mash gas extraction.
When the low concentration gas of mine extraction or high concentration gas reach value, generally all adopt combustion gas unit to generate electricity, for improving combustion gas unit efficiency and reducing unit number of units, separate unit gas electricity generator installation capacity has the trend of increase at present.Because mine gas emission rate is not steady state value, the gas amount of extraction is generally all greater than the total utilization of unit like this, is generally greater than the more than 15% even more of the total utilization of unit, and unnecessary gas is emptying bleeding off directly, waste mass energy.Therefore can utilize pipeline that this part gas is transported in weary airflow channel and is mixed, to realize making full use of gas.In this conveyance conduit, electrically operated valve also can be set and regulate.
Generally, the present invention sneaks into the gas of extraction by pipeline in the mine air-lack stream that participates in thermal power plant boiler burning, and a logical participation burning, has improved gas utilization rate effectively, greatly improve boiler of power plant fired coal combustion performance, especially larger to Gangue Power Plant meaning.Simultaneously, monitor and mix gas density, mash gas extraction concentration in after gas concentration, the total return of mine by monitoring system, especially in mash gas extraction transfer pipeline, install motor regulated valve, monitoring system is according to the gas density of monitoring, automatically electrically operated valve is carried out to valve opening adjusting, guaranteed that gas is able to maximum using safely, and in the time that Gas is abnormal, automatically close mash gas extraction and carry valve, realize the system-wide automatic control that mash gas extraction is carried.
Especially, mash gas extraction is sneaked in ventilation air gas or be diluted to safe concentration after participate in boiler combustion, overcome the general not enough shortcoming of ventilation air gas concentration, utilize to greatest extent the gas more than needed such as part low concentration mash gas extraction and gas combustion gas unit that is difficult to be utilized simultaneously, improve power plant's (especially Gangue Power Plant) Combustion Operation of Boilers, strengthen gangue utilization degree, significantly improved economic benefit and social benefit.
Those skilled in the art will also be appreciated that protection scope of the present invention is not limited in above-described embodiment, all equivalents of the present invention are all fallen within the scope of the invention.
Claims (8)
1. the mixed ventilation air gas of mash gas extraction ginseng participates in coal-fired boiler combustion system, wherein, what in mine return air vertical, produce weary distinguished and admirablely enters near air-introduced machine coal-burning power plant along weary airflow channel under the pumping of ventilation blower, and under the guiding of air-introduced machine, enter inlet air of boiler passage, it is characterized in that:
Mash gas extraction passage imports weary airflow channel, at the initiating terminal of mash gas extraction passage, mash gas extraction pump is set, mash gas extraction passage is entered in mash gas extraction pumping by mash gas extraction pump, mash gas extraction imports weary airflow channel along mash gas extraction passage, leads to described air-introduced machine with after weary distinguished and admirable mixing in weary airflow channel.
2. system according to claim 1, is characterized in that, the intersection between mash gas extraction passage and weary airflow channel arranges gas disperser, for mash gas extraction and weary distinguished and admirable mixing.
3. system according to claim 2, is characterized in that, the mode that described gas disperser adopts many discharge mouths of pipe to be evenly arranged in passage section.
4. according to the system described in claim 2 or 3, it is characterized in that, near described gas disperser, fence is set.
5. according to the system described in claim 2 or 3, it is characterized in that, gas monitor probe is set in mash gas extraction passage and/or weary airflow channel, to detect gas density, and Monitoring Data is uploaded in monitoring system computer.
6. system according to claim 1, it is characterized in that, in described mash gas extraction passage, electric valve for pipeline door is set, according to mixing after gas concentration automatic regulating valve door aperture, keep mixing after gas concentration in special ratios, in the time mixing after gas concentration lower than special ratios, intensifying valve aperture is until standard-sized sheet automatically, in the time that mixing after gas concentration is greater than described special ratios, reduce valve opening to reduce gas density.
7. system according to claim 1, is characterized in that, mash gas extraction is also set in mash gas extraction passage and regulates mouth, so that unnecessary gas is discharged smoothly.
8. system according to claim 7, is characterized in that, regulates a mouthful inlet air flow side that a water seal fire arrestor is installed at mash gas extraction delivery side of pump side and gas, to guarantee the safety of mash gas extraction passage and fire-proof and explosion-proof.
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| CN201410117814.3A CN103912891B (en) | 2014-03-26 | 2014-03-26 | The mixed ventilation air gas of mash gas extraction ginseng participates in coal-fired boiler combustion system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104329672A (en) * | 2014-10-31 | 2015-02-04 | 中国神华能源股份有限公司 | Device and method for co-firing mine gas and natural gas |
| CN105381694A (en) * | 2015-12-07 | 2016-03-09 | 兴边富民（北京）清洁能源技术有限公司 | Blending and treating system for ventilation air methane and drainage methane in coal mine |
| CN105972600A (en) * | 2016-05-23 | 2016-09-28 | 中国矿业大学 | Low-concentration gas and coal mixed combustion system |
| CN106764431A (en) * | 2016-11-28 | 2017-05-31 | 中国神华能源股份有限公司 | Gas transmission system |
| CN107143420A (en) * | 2017-05-09 | 2017-09-08 | 阮秀梅 | A kind of coal mine gas integrated application device |
| CN111648745A (en) * | 2020-05-21 | 2020-09-11 | 河南理工大学 | System for raising carbon dioxide concentration by extracting gas from mine with carbon dioxide outburst |
| CN113090319A (en) * | 2021-05-14 | 2021-07-09 | 重庆工程职业技术学院 | Automatic gas explosion-proof system and method for underground coal mine |
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| CN107143420A (en) * | 2017-05-09 | 2017-09-08 | 阮秀梅 | A kind of coal mine gas integrated application device |
| CN111648745A (en) * | 2020-05-21 | 2020-09-11 | 河南理工大学 | System for raising carbon dioxide concentration by extracting gas from mine with carbon dioxide outburst |
| CN113090319A (en) * | 2021-05-14 | 2021-07-09 | 重庆工程职业技术学院 | Automatic gas explosion-proof system and method for underground coal mine |
| CN113090319B (en) * | 2021-05-14 | 2022-06-10 | 重庆工程职业技术学院 | Automatic gas explosion-proof system and method for underground coal mine |
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