CN103388487A - Recovery device for methane in mine discharged air and application thereof - Google Patents
Recovery device for methane in mine discharged air and application thereof Download PDFInfo
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Abstract
The invention discloses a recovery device for methane in mine discharged air and application thereof. The device comprises a dust remover, a hydration reactor, a heat regenerator, a hydrate decomposer, an evaporator, a compressor, a condenser, a gas booster pump and the like. The application comprises the steps that the compressor and a solution pump are started; the working temperature in the hydration reactor reaches 2-3 degrees; the gas booster pump is started; the mine discharged air containing the methane is led to the hydration reactor; the pressure in the hydration reactor is kept at 0.3-1 MPa through adjusting a venting control valve I on the hydration reactor; working solution reacts with the methane in the mine discharged air to generate methane hydrate seriflux which flows to the hydrate decomposer through the heat regenerator to be decomposed; the decomposed methane is discharged from the top of the hydrate decomposer and is collected; after the methane is recycled, residual low-temperature gas in the hydration reactor is mixed with mine fresh air through the control valve I to cool a mine. The recovery device not only can recycle the methane in the mine discharged air, but also can cool the mine.
Description
Technical field
The present invention relates to retracting device and the application thereof of methane in a kind of mine for air exhaustion, belong to Refrigeration Engineering and technical field of chemical engineering.
Background technology
The coal bed gas of China's pump drainage is mainly the mixing coal bed gas that is produced by moving exploiting field and goaf in the coal mining process at present, wherein mixes into large quantity of air, and the methane concentration excursion is larger, is called " coal mine gas ".Because the explosion limit of methane is 5%-15%, the methane gas in this concentration range uses suitable difficulty and dangerous, and colliery usually methane gas that this concentration is lower directly is discharged in atmosphere, has caused the waste of mass energy.
In addition, the greenhouse effect of methane are 23 times of carbon dioxide, to the damage capability of atmospheric ozone layer, are CO
27 times, directly be discharged in atmosphere and can have a strong impact on atmospheric environment.China is big coal country, the methane gas discharge value accounts for 1/4 of the whole world, annual amount to pure methane because mining to the coal mine gas that discharges in atmosphere and reach more than 200 billion cubic meters (wherein, underground gas extraction amount in 2010 is 73.5 billion cubic meters, utilization is 25 billion cubic meters only), caused the great wasting of resources and serious greenhouse effect.
According to statistics, 2007-2010, national gas explosion accident occurs 98, and death toll 902 people, cause huge economic loss.
The concentration of methane in cost-effective control mine how, and the methane gas of fully recycling low concentration all is being significant aspect safety in production, energy-conservation and environmental protection.
When the environment temperature under mine surpassed 28 ℃, miner's incidence probability obviously rose.While surpassing 30 ℃, start to occur even death by accident of heatstroke." mine main getting working face air themperature must not be over 26 ℃ for the 102nd regulation of China's " mine safety rules "; When the air themperature of getting working face surpasses 30 ℃, must stop operation ".China is the first big coal country in the world, is also the many countries of high-temperature mine quantity.China's pit mining depth-averaged extends to deep with the speed of 11m every year.At present, some pit mining degree of depth has reached 900-1300m.According to incompletely statistics, China has more than 200 temperature to the coal mine excavation work plane at present over 30 ℃.So give mine cooling, eliminating the heat evil is problem demanding prompt solution.
CN1873285A discloses a kind of method of utilizing hydrate enrichment and accumulating coal bed gas, and the method is under the condition of 260K-285K, 2MPa-10MPa, makes methane and water in coal bed gas generate hydrate, purification methane.The method is feasible for the methane gas of higher concentration, but can have economy problems when the methane gas in processing low concentration (concentration is less than 10%) coal bed gas, and the cost that reclaims methane can increase substantially, and is difficult to be applied.
CN101530719B and CN101554560B disclose a kind of method and device of low-pressure processing of coal bed gas, and the operating pressure of the method is 0.11MPa-0.85MPa, and operating temperature is 3-18 ℃, and the object of processing is the coal bed gas of methane percent by volume 〉=30%.The experiment of methane hydrate generates pressure generally in the 3MPa left and right, and when pressure was lower, the driving force that hydrate generates was less, and generating rate is less; And for the lower methane gas that is difficult to be utilized of concentration, the method is also infeasible.
Therefore, the method for a kind of economical and efficient of searching reclaims the methane in mine for air exhaustion, is energy-conservation needs, is also the needs of protection of the environment.
Summary of the invention
One object of the present invention is that in order to solve above-mentioned hydrate and to extract methane in mine for air exhaustion cost recovery crosses the problem such as high and the retracting device of methane in a kind of mine for air exhaustion is provided, this retracting device not only can extract the methane in mine for air exhaustion, can also with remove after methane the residue cryogenic gas with pass in mine after fresh air mixes, regulate the temperature in mine; In addition, the cold that this retracting device absorbs when methane hydrate is decomposed is used, and can improve the coefficient of refrigerating performance (COP) of refrigeration unit, therefore, utilize this retracting device to carry out the recovery of methane in mine for air exhaustion, not only reduced energy waste, and reduced greenhouse gas emission.
Technical scheme of the present invention
The retracting device of methane in a kind of mine for air exhaustion, comprise deduster, hydration reactor, regenerator, decomposition of hydrate device, evaporimeter, compressor, condenser, gas boosting pump;
Described deduster is provided with gas access and gas vent, and this gas access is used for introducing the air draft of mine, and gas vent is connected with the gas distributor of the bottom that is arranged on hydration reactor by pipeline by the gas boosting pump;
Described gas distributor is the sieve plate of percent opening 15%, and aperture is 2mm-5mm, the gas distributor of setting be in order to smash that methane gas in air draft forms bubble in case further with hydration reactor in working solution fully contact and carry out hydration reaction;
The bottom that the top of the straight drum part of described hydration reactor is provided with working solution outlet, straight drum part is provided with the entrance of working solution, and the top of hydration reactor is provided with gas exhaust port, and this gas exhaust port is connected with gas exhausting valve I by pipeline;
The preferred watertight shutter of installing in described hydration reactor top, prevent that air-flow from taking the methane hydrate slurries out of; Also magnetic stirring apparatus can be installed in hydration reactor, accelerate the formation speed of methane hydrate slurries;
The top of regenerator is provided with working solution entrance, working solution outlet, and bottom is provided with refrigerant entrance, refrigerant exit;
The bottom of decomposition of hydrate device is provided with the refrigerant entrance and refrigerant exit, top are provided with the working solution entrance, bottom is provided with the working solution outlet, and top is provided with gas discharge outlet;
Condenser is provided with refrigerant entrance and refrigerant exit;
The working solution outlet of hydration reactor is connected with the working solution entrance on regenerator top, and the working solution outlet on regenerator top is connected with the working solution entrance on decomposition of hydrate device top;
Refrigerant entrance on regenerator is connected with the refrigerant exit of condenser, refrigerant exit on regenerator is connected with the refrigerant entrance on evaporimeter top by pipeline through choke valve by pipeline, and the refrigerant exit on evaporimeter top is by being connected with the refrigerant entrance of the bottom of hydration decomposer after compressor;
The refrigerant exit of the bottom of decomposition of hydrate device is connected with the refrigerant entrance of condenser;
The top of decomposition of hydrate device is provided with gas discharge outlet, and described gas discharge outlet is connected with gas exhausting valve II through pipeline;
The outlet of the working solution of the bottom of decomposition of hydrate device is connected with the working solution entrance of the bottom of evaporimeter, and the bottom working solution of evaporimeter exports after solution pump with the bottom working solution entrance of the straight drum part of hydration reactor and is connected.
In above-mentioned a kind of mine for air exhaustion, the retracting device of methane mainly comprises two cyclic processes in the methane recovery process in mine for air exhaustion, i.e. refrigerant circulation and working solution circulation;
The cyclic process of described cold-producing medium is as follows:
Entering compressor from the refrigerant exit cold-producing medium out on evaporimeter top enters the decomposition of hydrate device after compressed, with the hydrate slurry heat exchange of being rich in methane wherein, temperature reduces, then entering condenser further lowers the temperature, at this moment the cold-producing medium state that reaches capacity, enter regenerator from condenser saturation state cold-producing medium out and further lower the temperature, then enter evaporimeter after the choke valve throttling, again enter in compressor and recycle after evaporation endothermic in evaporimeter;
The cyclic process of described working solution is as follows:
the low-temperature working solution that exports out from the bottom working solution of evaporimeter enters hydration reactor through solution pump, react and generate the hydrate slurry that is rich in methane with methane air draft from the gas boosting pump comes, then swim in the top of hydration reactor, enter in regenerator and make cold-producing medium excessively cold by pipeline after the working solution outlet on the top of the straight drum part of hydration reactor is discharged, the temperature of self raises, then flow into the decomposition of hydrate device with from compressor cold-producing medium heat exchange out, due to very high from compressor refrigerant temperature out, be enough to allow the decomposition of hydrate that is rich in methane in the decomposition of hydrate device discharge methane, directly entering evaporimeter after working solution after decomposition is discharged by the working solution outlet of the bottom of hydration decomposer lowers the temperature again, recycle.
The method of utilizing the retracting device of methane in above-mentioned a kind of mine for air exhaustion to reclaim methane in mine for air exhaustion, concrete steps are as follows:
Open compressor and solution pump, making working solution in hydration reactor is that mass percent concentration is that the TBAB aqueous temperature of 10-30% drops to 2-3 ℃; After temperature reaches 2-3 ℃, open the gas boosting pump, pass into the mine for air exhaustion that contains methane in hydration reactor, and, by regulating the gas exhausting valve I at hydration reactor top, make the pressure of hydration reactor remain on 0.3-1MPa; At this moment working solution is that mass percent concentration is tetrabutyl phosphonium bromide aqueous ammonium and the generation of the methane reaction in the mine for air exhaustion methane hydrate slurries of 10-30%, flow into the decomposition of hydrate device after regenerator, the methane hydrate slurries discharge methane gas in decomposition in the decomposition of hydrate device and collect after the gas exhausting valve II at decomposition of hydrate device top discharges, and namely complete the recovery of methane in mine for air exhaustion;
in the process that in above-mentioned mine for air exhaustion, methane reclaims, working solution is that mass percent concentration is that the tetrabutyl phosphonium bromide aqueous ammonium of 10-30% and the methane in the air draft pressure while carrying out hydration reaction is 0.3-1MPa in hydration reactor, and the residue cryogenic gas of deviating from air draft after methane is discharged through gas exhausting valve I from the gas discharge outlet at hydration reactor top, then calculate by volume, be the residue cryogenic gas of deviating from air draft after methane: new wind is the ratio of 1:1, to deviate from residue cryogenic gas and the temperature of sending into after new wind mixes in mine with the adjusting mine after methane.
In the process that in above-mentioned mine for air exhaustion, the retracting device of methane reclaims, the operating pressure the when hydrate slurry that is rich in methane in the decomposition of hydrate device decomposes is 0.3-1MPa, and temperature is 30 ℃ of left and right; Under this temperature, pressure condition, the hydrate slurry that is rich in methane decomposes, and discharges methane, and methane is discharged and collected by pipeline by gas control valve II from the top of decomposition of hydrate device, the methane of collecting both can store civilian or commercial, also can be transported in generator and generate electricity.
Beneficial effect of the present invention
the retracting device of methane in a kind of mine for air exhaustion of the present invention, hydrate is reclaimed the methane method, mine air control method and refrigeration system power-economizing method organically combine, when reclaiming methane, also mine is lowered the temperature, more than in the past patent function, structure is simpler, be used by remaining the cold that carries in cryogenic gas, and the heat that utilizes the methane hydrate decomposition to absorb makes the cold-producing medium of condensator outlet excessively cold, thereby improved the COP of refrigeration system, reduced power consumption and the running cost of air-conditioning system in the mine, more sufficient conventional hydrate extracts the deficiency of methane in mine for air exhaustion.
Description of drawings
The retracting device of methane in Fig. 1, a kind of mine for air exhaustion, wherein 1 is that evaporimeter, 2 is that compressor, 3 is that decomposition of hydrate device, 4 is that condenser, 5 is that choke valve, 6 is that solution pump, 7 is that hydration reactor, 8 is that gas distributor, 9 is that gas boosting pump, 10 is that deduster, 11 is that gas exhausting valve I, 12 is that gas exhausting valve II, 13 is regenerator, fine rule in figure represents the workflow of cold-producing medium, and the thick line in figure represents the workflow of methane recovery.
The specific embodiment
Also by reference to the accompanying drawings the present invention is further set forth below by embodiment, but do not limit the present invention.
In embodiments of the invention, cold-producing medium used is R134a, and the manufacturer of this cold-producing medium is du pont company.
Embodiment 1
The retracting device of methane in a kind of mine for air exhaustion, its schematic flow sheet as shown in Figure 1, comprises evaporimeter 1, compressor 2, decomposition of hydrate device 3, condenser 4, choke valve 5, solution pump 6, hydration reactor 7, gas distributor 8, gas boosting pump 9, deduster 10, gas exhausting valve I11, gas exhausting valve II12 and regenerator 13.
Described deduster 10 is provided with gas access and gas vent, and this gas access is used for introducing the air draft of mine, and gas vent is connected with the gas distributor 8 of the bottom that is arranged on hydration reactor 7 by pipeline by gas boosting pump 9;
Described gas distributor 8 is the sieve plate of percent opening 15%, and aperture is 2mm-5mm;
The bottom that the top of the straight drum part of described hydration reactor 7 is provided with working solution outlet opening, straight drum part is provided with the inlet port of working solution, and the top of hydration reactor 7 is provided with gas exhaust port, and this gas exhaust port is connected with gas exhausting valve I11 by pipeline;
The top of regenerator 13 is provided with working solution entrance, working solution outlet, and bottom is provided with refrigerant entrance, refrigerant exit;
The bottom of decomposition of hydrate device 3 is provided with the refrigerant entrance and refrigerant exit, top are provided with the working solution entrance, bottom is provided with the working solution outlet, and top is provided with gas discharge outlet;
Condenser 4 is provided with refrigerant entrance and refrigerant exit;
The working solution outlet opening of hydration reactor 7 is connected with the working solution entrance on regenerator 13 tops, and the working solution outlet on regenerator 13 tops is connected with the working solution entrance on decomposition of hydrate device 3 tops;
Refrigerant entrance on regenerator 13 is connected with the refrigerant exit of condenser 4, refrigerant exit on regenerator 13 is connected with the refrigerant entrance on evaporimeter 1 top by pipeline through choke valve 5 by pipeline, and the refrigerant exit on evaporimeter 1 top is by being connected with the refrigerant entrance of the bottom of hydration decomposer 3 after compression pump 2;
The refrigerant exit of the bottom of decomposition of hydrate device 3 is connected with the refrigerant entrance of condenser 4;
The top of decomposition of hydrate device 3 is provided with gas discharge outlet, and described gas discharge outlet is connected with gas exhausting valve II12 through pipeline;
The outlet of the working solution of the bottom of decomposition of hydrate device 3 is connected with the working solution entrance of the bottom of evaporimeter 1, and the bottom working solution of evaporimeter 1 exports after solution pump 6 with the bottom working solution entrance of the straight drum part of hydration reactor 7 and is connected.
The method of utilizing the retracting device of methane in above-mentioned a kind of mine for air exhaustion to reclaim methane in mine for air exhaustion, concrete steps are as follows:
At first the air draft that contains methane of discharging from mine enters dedusting in deduster 10, then crossing through the device for cleaning pipeline at gas boosting pump 9 places the gas distributor 8 that is arranged on hydration reactor 7 bottoms enters in hydration reactor 7, the tetrabutyl phosphonium bromide aqueous ammonium that methane gas and the mass percent concentration of hydration reactor 7 that enters into the air draft of hydration reactor 7 is 10-30% fully mixes and reacts and generates the slurries that are rich in methane hydrate, then swims in the top of hydration reactor 7;
The operating pressure of above-mentioned hydration reactor 7 is 0.3-1MPa, and temperature is 3 ℃ of left and right;
Unreacted residual gas in hydration reactor 7 from bottom to top with after working solution in hydration reactor 7 is that after mass percent concentration is the tetrabutyl phosphonium bromide aqueous ammonium heat exchange of 10-30%, temperature is reduced to 3 ℃ of left and right from the top of hydration reactor 7 after gas exhausting valve I11 discharges by volume the ratio of 1:1 mix with the new wind facies from atmosphere, make mixed air themperature reach 15 ℃ of left and right, send in mine the temperature of regulating tunnel and work plane;
In hydration reactor 7, temperature is that the slurries that are rich in methane hydrate of 3 ℃ of left and right enter in regenerator 13 through pipeline the temperature that makes the slurries self that are rich in methane hydrate by the set working solution outlet opening in top and raise, then flow into decomposition of hydrate device 3 and with from compressor 2 out, the cold-producing medium that enters into decomposition of hydrate device 3 carries out heat exchange, make the slurry temperature that the is rich in methane hydrate 30 ℃ of left and right that raise, so that be rich in the slurries of methane hydrate, decomposite methane gas and through the gas exhausting valve II12 at the top of decomposition of hydrate device 3, discharge and collect methane;
The operating pressure of decomposition of hydrate device 3 is 0.3-1MPa, and temperature is 30 ℃ of left and right;
The cold-producing medium of working solution in evaporimeter 1 that decomposites the remainder after methane gas in decomposition of hydrate device 3 cools to 3 ℃ and again enters hydration reactor 7 bottoms and with the methane of the air draft that enters into hydration reactor 7, continue reaction by solution pump 6 and generate methane hydrate;
Entering the compressed rear temperature and pressure of compressor 2 from evaporimeter 1 cold-producing medium out raises, enter in decomposition of hydrate device 3, reduce with the temperature of cold-producing medium after the hydrate slurry heat exchange of being rich in methane, then entering condenser 4 further lowers the temperature, at this moment the cold-producing medium state that reaches capacity, entering regenerator 13 from condenser 4 cold-producing medium out further lowers the temperature, reach supercooled state, then pass through the further decrease temperature and pressure of choke valve 5, again enter in compressor 2 after entering evaporimeter 1 evaporation endothermic, circulated;
In sum, than common refrigerating air conditioning device, the retracting device of methane in a kind of mine for air exhaustion of the present invention, the decomposition heat that absorbs when methane hydrate is decomposed is used, thereby improved the coefficient of refrigerating performance (COP) of kind of refrigeration cycle, reached energy-conservation purpose.
Further, reclaim the retracting device of methane in a kind of mine for air exhaustion of the present invention, the methane in recyclable mine for air exhaustion not only, also can send into residue cryogenic gas and the new wind of mine deviate from after methane in mine after mixing for the ratio of 1:1, by volume to regulate the temperature in mine.
Above said content is the basic explanation under conceiving for the present invention only, and according to technical scheme of the present invention institute
Any equivalent transformation of doing, all should belong to protection scope of the present invention.
Claims (6)
1. the retracting device of methane in a mine for air exhaustion, is characterized in that comprising deduster, gas boosting pump, hydration reactor, regenerator, decomposition of hydrate device, evaporimeter, compressor, condenser, choke valve;
Described deduster is provided with gas access and gas vent, and the air draft of mine be used for to be introduced in this gas access, gas vent by the gas boosting pump by pipeline be arranged on hydration reactor in be connected near the gas distributor of bottom;
The bottom that the top of the straight drum part of described hydration reactor is provided with working solution outlet, straight drum part is provided with the working solution entrance, and the top of hydration reactor is provided with gas exhaust port, and this gas exhaust port is connected with gas exhausting valve I by pipeline;
The top of regenerator is provided with working solution entrance, working solution outlet, and bottom is provided with refrigerant entrance, refrigerant exit;
The bottom of decomposition of hydrate device is provided with the refrigerant entrance and refrigerant exit, top are provided with the working solution entrance, bottom is provided with the working solution outlet, and top is provided with gas discharge outlet;
Condenser is provided with refrigerant entrance and refrigerant exit;
The working solution outlet of hydration reactor is connected with the working solution entrance on regenerator top, and the working solution outlet on regenerator top is connected with the working solution entrance on decomposition of hydrate device top;
Refrigerant entrance on regenerator is connected with the refrigerant exit of condenser, refrigerant exit on regenerator is connected with the refrigerant entrance on evaporimeter top by pipeline through choke valve by pipeline, and the refrigerant exit on evaporimeter top is by being connected with the refrigerant entrance of the bottom of hydration decomposer after compressor;
The refrigerant exit of the bottom of decomposition of hydrate device is connected with the refrigerant entrance of condenser;
The top of decomposition of hydrate device is provided with an outlet opening, and described outlet opening is connected with gas exhausting valve II through pipeline;
The outlet of the working solution of the bottom of decomposition of hydrate device is connected with the working solution entrance of the bottom of evaporimeter, and the bottom working solution of evaporimeter exports after solution pump with the bottom working solution entrance of the straight drum part of hydration reactor and is connected.
2. the retracting device of methane in a kind of mine for air exhaustion as claimed in claim 1, is characterized in that described gas distributor is that percent opening 15%, aperture are the sieve plate of 2mm-5mm.
3. the retracting device of methane in a kind of mine for air exhaustion as claimed in claim 2, is characterized in that described hydration reactor top is provided with watertight shutter.
4. the retracting device of methane in a kind of mine for air exhaustion as claimed in claim 3, is characterized in that the working solution in described hydration reactor is that mass percent concentration is the tetrabutyl phosphonium bromide aqueous ammonium of 10-30%.
5., as retracting device application in methane recovery in mine for air exhaustion of methane in claim 1,2,3 or 4 described a kind of mine for air exhaustion, it is characterized in that concrete steps are as follows:
open compressor and solution pump, making working solution in hydration reactor is that mass percent concentration is that the TBAB aqueous temperature of 10-30% drops to 2-3 ℃, open the gas boosting pump, pass into the mine for air exhaustion that contains methane in hydration reactor, and by regulating gas exhausting valve I, make the pressure of hydration reactor remain on 0.3-1MPa, at this moment working solution is that mass percent concentration is that the tetrabutyl phosphonium bromide aqueous ammonium of 10-30% and the methane reaction in mine for air exhaustion generate the methane hydrate slurries and flow into the decomposition of hydrate device after by regenerator, the methane hydrate slurries decompose and discharge methane in the decomposition of hydrate device, the methane that discharges is collected after the gas exhausting valve II discharge at hydration decomposer top, namely complete the recovery of methane in mine for air exhaustion,
The operating pressure when hydrate slurry that is rich in methane in the decomposition of hydrate device decomposes is 0.3-1MPa, and temperature is 30 ℃.
6. the retracting device of methane in a kind of mine for air exhaustion as claimed in claim 5, it is characterized in that in hydration reactor, the residue cryogenic gas of deviating from air draft after methane is discharged through gas exhausting valve I from the gas discharge outlet at hydration reactor top, then calculate by volume, be the residue cryogenic gas of deviating from air draft after methane: new wind is the ratio of 1:1, will deviate from after methane the residue cryogenic gas with send in mine after newly wind mixes.
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| CN107420125A (en) * | 2017-05-12 | 2017-12-01 | 李灿欣 | A kind of coal mine wind-lack gas separated collection system |
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| CN107420125A (en) * | 2017-05-12 | 2017-12-01 | 李灿欣 | A kind of coal mine wind-lack gas separated collection system |
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| CN103388487B (en) | 2016-01-20 |
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