CN114837649A - Coal bed gas separation system and process - Google Patents
Coal bed gas separation system and process Download PDFInfo
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- CN114837649A CN114837649A CN202210474541.2A CN202210474541A CN114837649A CN 114837649 A CN114837649 A CN 114837649A CN 202210474541 A CN202210474541 A CN 202210474541A CN 114837649 A CN114837649 A CN 114837649A
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- 239000003245 coal Substances 0.000 title claims abstract description 121
- 238000000926 separation method Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title description 9
- 230000006835 compression Effects 0.000 claims abstract description 99
- 238000007906 compression Methods 0.000 claims abstract description 99
- 238000000746 purification Methods 0.000 claims abstract description 62
- 230000018044 dehydration Effects 0.000 claims abstract description 17
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 17
- 238000003860 storage Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 142
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 40
- 239000007788 liquid Substances 0.000 claims description 33
- 238000010521 absorption reaction Methods 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 14
- 238000001179 sorption measurement Methods 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000010926 purge Methods 0.000 claims description 2
- 210000000567 greater sac Anatomy 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 241000272165 Charadriidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/20—Capture or disposal of greenhouse gases of methane
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical & Material Sciences (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a coal bed gas separation system, which comprises: the conveying pipe is communicated with an external air supply pump and is used for discharging and conveying the preliminarily extracted and filtered coal bed gas; mounting a support; the multistage compression assembly is arranged on the mounting support, and one end of the conveying pipe is communicated with the multistage compression assembly and used for compressing the coal bed gas; the branch purification component is communicated with the multistage compression component, and the multistage compression component is used for respectively conveying the coal bed gas with different compression degrees into the branch purification component after the internal compression of the coal bed gas is completed; the collecting pipe is connected with the output end of the branch purifying assembly; the first dehydration tower and the second dehydration tower are communicated with each other, and one end of the header is communicated with the first dehydration tower and the second dehydration tower; the remover is communicated with the output end of the second dehydration tower; and the air storage tank is communicated with the remover.
Description
Technical Field
The invention belongs to the technical field of gas treatment equipment, and particularly relates to a coal bed gas separation system and a coal bed gas separation process.
Background
The coal bed gas belongs to associated gas in coal mine production, particularly, the coal mine mining is carried out while coal bed gas needs to be extracted in a mine tunnel to ensure the safety of coal mining, the methane content of the coal bed gas extracted by the method is low, the volume fraction is usually more than 20%, and the rest of components are mainly air. The separation and recovery of methane from the oxygen-containing coal bed gas has important significance for expanding and improving the use value of the coal bed gas and the economical efficiency of coal mine production. Most of the currently disclosed devices for separating methane from oxygen-containing coal bed gas are provided with a special deoxidation system or a refrigeration system and a refrigerant storage and filling system, the process is complex, the number of heat exchange devices is large, the number of devices is large, the processing energy consumption is high, and meanwhile, the coal bed gas is required to have certain pressure to realize better separation, but the lower the pressure is, the safer the pressure is, so the devices have certain problems in the aspects of economy and safety; particularly, the required compression strength of the coal bed gas is different under different concentrations, and the single compression purification can meet the purification requirement, but the discharge efficiency is low, the subsequent separation working efficiency is seriously influenced, and the working frequency is increased;
accordingly, one skilled in the art provides a coal bed methane separation system and process to solve the above problems.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a coal bed methane separation system, comprising:
the conveying pipe is communicated with an external air supply pump and is used for discharging and conveying the preliminarily extracted and filtered coal bed gas;
mounting a support;
the multistage compression assembly is arranged on the mounting support, and one end of the conveying pipe is communicated with the multistage compression assembly and used for compressing the coal bed gas;
the branch purification component is communicated with the multi-stage compression component, and the multi-stage compression component conveys the coal bed gas with different compression degrees into the branch purification component after the internal compression of the coal bed gas is completed so as to facilitate the branch purification component to carry out branch purification on the coal bed gas;
the collecting pipe is connected to the output end of the branch purification component;
the first dewatering tower and the second dewatering tower are communicated with each other, one end of the collecting pipe is communicated with the first dewatering tower and the second dewatering tower, so that 80% of the coal bed gas is subjected to rough moisture adsorption preferentially through the first dewatering tower and then subjected to secondary adsorption through the second dewatering tower, and meanwhile, the remaining 20% of the coal bed gas can be subjected to moisture adsorption directly through the second dewatering tower;
the remover is communicated with the output end of the second dehydration tower; and
and the gas storage tank is communicated with the remover and is used for timely storing the separated pure coal bed gas.
Further, preferably, the multistage compression assembly includes:
the outer cylinder part is transversely fixed on the upper end surface of the mounting support through the support body;
the front compression device is vertically fixed in the outer cylinder part;
the inner connecting pipe is connected to one end of the conveying pipe, and the other end of the inner connecting pipe is communicated with the front compression device;
the fine adjustment pressure dividing device is arranged in the outer cylinder part and communicated with the front compression device through a connecting pipe;
the middle pipe is vertically communicated with the connecting pipe, and one end of the middle pipe is communicated with the branch purification assembly; and
the external connecting pipe is connected to one side of the fine adjustment pressure dividing device, and the other end of the external connecting pipe is communicated with the branch purification assembly.
Further, preferably, the middle pipe can convey 30% of the total conveying amount of the coal bed gas to one purification branch in the branch purification assembly; and the external pipe can convey the residual 70% of the coal bed gas to another purification branch in the branch purification assembly.
Further, preferably, the pre-compression device includes:
compressing the bin;
the inner pressing piece is arranged in the compression bin in a sliding manner;
the main rotating disc is rotatably erected above the compression bin, a transmission rod is hinged to the main rotating disc, and one end of the transmission rod is connected with the inner pressing piece;
the piston piece is arranged in the compression bin in a sliding mode and located below the inner pressing piece, and the piston piece is connected with the inner pressing piece through a supporting spring; and
and the inner limiting sleeve is coaxially fixed in the compression bin.
Further, preferably, the method further comprises:
the inner shaft plate is arranged in the piston piece in a sealing sliding mode and is fixed with the inner pressing piece through a telescopic adjusting column;
the inner shaft plug is coaxially and slidably arranged in the piston piece and is in sliding fit with the inner limiting sleeve;
and the connecting springs are arranged in a plurality and are connected between the inner shaft plate and the inner shaft plug.
Further, preferably, the fine adjustment voltage divider includes:
a total cavity;
the telescopic cylinders are symmetrically fixed on the outer cylinder piece, the discharge pressure plate is arranged in the main cavity in a sealing and sliding manner, and the output ends of the telescopic cylinders are communicated with the discharge pressure plate;
the guide cavities are vertically arranged and communicated on the total cavity body;
the fine adjustment telescopic rods are coaxially fixed on the guide cavities, connecting plugs are arranged in the guide cavities in a sliding mode, the output ends of the fine adjustment telescopic rods are fixed with the connecting plugs, and one end of each guide cavity is connected with a discharge pipe;
the shaft ring body is coaxially fixed in the guide cavity; and
the sealing plug is connected below the connecting plug through a plurality of telescopic guide rods, the sealing plug can seal and plug the shaft ring body, and a plurality of exhaust inner holes are formed in the periphery of the shaft ring body.
Further, preferably, the branched purge module includes:
the inflow pipe is communicated with an external flow supply pump;
the inner flow bin is communicated with the flow inlet pipe, and a plurality of separation cavities are arranged below the inner flow bin;
the seepage layers are vertically arranged in the separation cavities;
the built-in motor is arranged on the flow inlet pipe, a stirring shaft is vertically fixed at the output end of the built-in motor, and the stirring shaft is rotatably connected on the seepage layer in a penetrating way;
the air inlet pipe is communicated with the multistage compression assembly, and the other end of the air inlet pipe is communicated with each separation cavity through a plurality of lateral flow pipes;
the outer air exhaust pipe is hermetically connected to one side of the upper end face of the inner flow bin, a ventilation mesh cover is arranged on the inner flow bin, and the other end of the outer air exhaust pipe is communicated with the collection pipe;
the outer liquid pipe is vertically erected on one side of the inner flow bin and is communicated with the separation cavities; and
and the upper purifying device is arranged at the upper end of the inner flow bin in an overhead mode, and one end of the outer liquid pipe is communicated with the upper purifying device.
Further, preferably, the upper purification apparatus includes:
a main box body;
the inner flow pipe is vertically fixed in the middle of the main box body, and one end of the inner flow pipe is communicated with the flow inlet pipe and the outer liquid pipe;
the jet flow nozzles are arranged on the inner flow pipe in a circumferential array;
the main discharge pipe is connected to one side of the upper end face of the main box body, and the other end of the main discharge pipe is communicated with the collecting pipe; and
and the waste liquid pipe is communicated below the main box body.
A coal bed gas separation process comprises the following steps:
s1, conveying coal bed gas, wherein the coal bed gas after being mined and filtered is conveyed to a multi-stage compression assembly through a conveying pipe;
s2, compressing the coal bed gas, wherein the coal bed gas preferentially enters a front-mounted compression device, and the coal bed gas is primarily compressed through the front-mounted compression device so as to achieve separation concentration, at the moment, 30% of the total conveying amount of the coal bed gas can be conveyed to a purification device through a middle pipe for coarse purification treatment, and the rest 70% of the coal bed gas is subjected to secondary compression work through a fine adjustment pressure dividing device;
s3, purifying the coal bed gas with high content precision, conveying absorption liquid to an inner flow bin by an inflow pipe, correspondingly conveying 70% of the coal bed gas to each separation cavity from a fine adjustment pressure dividing device through an air inlet pipe, enabling the absorption liquid to be stored on a seepage layer and gradually seep and flow out, and enabling the coal bed gas to penetrate through each seepage layer to the inner flow bin by an auxiliary rotary disturbance of a stirring shaft and to be discharged into an outer exhaust pipe by a ventilation net cover on the inner flow bin;
s4, roughly purifying the coal bed gas with low content, directly conveying 30% of the coal bed gas into an upper purifying device from a front-mounted compression device through a middle pipe, spraying absorption liquid into a main box body through a jet flow spray head by the upper purifying device, roughly purifying and then feeding the absorption liquid into a collecting pipe;
s5, dehydrating the gas, and adsorbing moisture through a first dehydrating tower and a second dehydrating tower;
and S6, gas separation, namely discharging residual oxygen and non-methane combined gas in the coal bed gas through a remover, and then storing the coal bed gas through a gas storage tank.
Compared with the prior art, the invention has the beneficial effects that:
the exploited coal bed gas can be compressed at different strengths through the multi-stage compression assembly, at the moment, the front-end compression device conveys 30% of the total conveying amount of the coal bed gas to the upper purification device in the branch purification assembly through the middle pipe, the rest 70% of the coal bed gas is subjected to secondary compression through the fine adjustment pressure dividing device, so that high-concentration gas is formed, the low-concentration gas is roughly purified through the branch purification assembly, and the high-concentration gas is precisely purified through the branch purification assembly, so that the purification effect is ensured while the compression concentration of the coal bed gas is ensured.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a multi-stage compression assembly according to the present invention;
FIG. 3 is a schematic view of a pre-compressor according to the present invention;
FIG. 4 is a schematic structural diagram of a fine adjustment voltage divider of the present invention;
FIG. 5 is a schematic view of the branched cleaning module according to the present invention;
FIG. 6 is a schematic view showing the construction of an upper purification apparatus according to the present invention;
in the figure: 1 mounting support, 11 first dewatering tower, 12 second dewatering tower, 13 remover, 14 gas storage tank, 2 conveying pipe, 3 multi-stage compression assembly, 31 outer cylinder, 32 inner connecting pipe, 33 connecting pipe, 34 outer connecting pipe, 35 middle pipe, 4 branch purification assembly, 41 inner flow bin, 42 separation cavity, 43 seepage layer, 44 built-in motor, 45 gas inlet pipe, 46 side flow pipe, 47 air permeable net cover, 48 outer liquid pipe and 49 outer gas outlet pipe, 5 a front compression device, a 51 compression bin, 52 a main rotating disc, 53 an inner compression piece, 54 a piston piece, 55 a supporting spring, 56 an inner limiting sleeve, 57 an inner shaft plug, 58 an inner shaft plate, 6 a fine adjustment pressure divider, 61 a total cavity, 62 a telescopic cylinder, 63 a guide cavity, 64 a fine adjustment telescopic rod, 65 a telescopic guide rod, 66 a shaft ring body, 7 an inflow pipe, 8 an upper purification device, 81 a main box body, 82 an inner flow pipe, 83 a jet flow nozzle and 84 a main exhaust pipe.
Detailed Description
Referring to fig. 1, in an embodiment of the present invention, a coal bed methane separation system includes:
the conveying pipe 2 is communicated with an external air supply pump and is used for discharging and conveying the preliminarily extracted and filtered coal bed gas;
installing a support 1;
the multistage compression assembly 3 is arranged on the mounting support 1, and one end of the conveying pipe 2 is communicated with the multistage compression assembly 3 and used for compressing the coal bed gas;
the branch purification component 4 is communicated with the multistage compression component 3, and the multistage compression component 3 respectively conveys the coalbed methane with different compression degrees into the branch purification component 4 after the internal compression of the coalbed methane is completed, so that the branch purification component 4 performs branch purification on the coalbed methane; that is, the coal bed gas can form low-concentration gas and high-concentration gas respectively after the compression degree, at the moment, the low-concentration gas can be roughly purified by the branch purification component, and the high-concentration gas is precisely purified by the branch purification component, so that the compression concentration and the purification degree of the later-stage gas mixture can reach the process standard, the gas production treatment efficiency is improved, and compared with the existing single compression purification, the coal bed gas compression concentration and purification effect can be ensured and the treatment efficiency is improved;
a collecting pipe connected with the output end of the branch purification component 4;
the first dewatering tower 11 and the second dewatering tower 12 are communicated with each other, one end of the header is communicated with the first dewatering tower 11 and the second dewatering tower 12, so that 80% of the coal bed gas is subjected to rough moisture adsorption preferentially through the first dewatering tower 11 and then is subjected to secondary adsorption through the second dewatering tower 12, and meanwhile, the rest 20% of the coal bed gas can be directly subjected to moisture adsorption through the second dewatering tower 12; further improving the treatment efficiency so as to adapt to the high-strength continuous coal bed gas mining treatment;
a remover 13 communicated with the output end of the second dehydration tower 12; the remover can separate and discharge non-methane combined gas (such as oxygen, nitrogen and the like) in the coal bed gas; and
and the gas storage tank 14 is communicated with the remover 13 and is used for timely storing the separated pure coal bed gas.
In this embodiment, the multistage compression assembly 3 includes:
the outer cylinder part 31 is transversely fixed on the upper end surface of the mounting support 1 through a support body;
the front compression device 5 is vertically fixed in the outer cylinder part 31;
an inner joint pipe 32 connected to one end of the conveying pipe 2, the other end of the inner joint pipe 32 communicating with the pre-compression device 5;
the fine adjustment pressure dividing device 6 is arranged in the outer cylinder part 31, and the fine adjustment pressure dividing device 6 is communicated with the front compression device 5 through a connecting pipe 33;
the middle pipe 35 is vertically communicated with the connecting pipe 33, and one end of the middle pipe 35 is communicated with the branch purification assembly 4; and
and the external connecting pipe 34 is connected to one side of the fine adjustment pressure dividing device 6, and the other end of the external connecting pipe 34 is communicated with the branch purification component 4.
In a preferred embodiment, the middle pipe 35 can convey 30% of the total amount of coal bed gas to one of the purification branches in the branch purification unit 4; and external pipe 34 can carry remaining 70% coal bed gas to another purification branch department in the branch purifies subassembly 4, that is to say, the coal bed gas of exploitation reaches certain concentration (can be less than coal bed gas concentration standard) after leading compressor arrangement's preliminary compression, 70% coal bed gas can carry out the secondary compression through the accurate partial pressure device of transferring, and form high concentration gas, each different concentration gas mixes after corresponding purification treatment, the gas compression concentration under the hybrid state is the gas concentration of treating the separation processing promptly at this moment, thereby reduce the gas and process the length of consuming time under lasting high strength compression, especially can avoid the gas explosion under the high strength work.
In this embodiment, the pre-compression device 5 includes:
a compression bin 51;
the inner pressing piece 53 is arranged in the compression bin 51 in a sliding mode;
the main rotating disc 52 is rotatably erected above the compression bin 51, a transmission rod is hinged to the main rotating disc 52, and one end of the transmission rod is connected with the inner pressing piece 53;
a piston member 54 slidably disposed in the compression chamber 51 below the inner pressing member 53, wherein the piston member 54 is connected to the inner pressing member 53 via a supporting spring 55; and
and the inner limiting sleeve 56 is coaxially fixed in the compression bin 51, wherein the main rotating disc can drive the piston piece to compress the coal bed gas under continuous rotation, and the primary compression concentration can be controlled by controlling the single gas discharge amount.
In this embodiment, the method further includes:
an inner shaft plate 58, which is arranged in the piston member 54 in a sealing and sliding manner, wherein the inner shaft plate 58 is fixed with the inner pressing member 53 through a telescopic adjusting column;
an inner shaft plug 57 coaxially and slidably arranged in the piston member 54, wherein the inner shaft plug 57 is slidably fitted with an inner limit sleeve 56;
the connecting springs are arranged in a plurality, each connecting spring is connected between the inner shaft plate 58 and the inner shaft plug 57, in general work, the telescopic adjusting columns are in a contraction state, the distance between the inner pressing piece and the piston piece is smaller, the supporting springs are in a compression state, and the piston piece is not abutted against and contacted with the inner limiting sleeve in vertical reciprocating displacement; especially, leading compressor arrangement still can carry out the compression of relative high strength gas, and flexible regulation post is in the state of stretching out this moment, and supporting spring is in normal tension state, and piston spare leans on the contact with interior spacing cover in vertical reciprocating displacement for gas gets into in the spacing cover, and interior stopper accessible flexible regulation post slides at the minimum position and stretches into to interior spacing cover and carry out the high strength compression, so that improve earlier stage coal bed gas compression concentration.
In this embodiment, the fine adjustment voltage divider 6 includes:
the overall cavity 61;
the telescopic cylinders 62 are symmetrically fixed on the outer cylinder part 31, a pressure discharge plate is arranged in the main cavity 61 in a sealing sliding manner, and the output ends of the telescopic cylinders 62 are communicated with the pressure discharge plate;
the guide cavity 63 is vertically arranged and communicated on the main cavity 61;
the fine adjustment telescopic rod 64 is coaxially fixed on the guide cavity 63, a connecting plug is arranged in the guide cavity 63 in a sliding mode, the output end of the fine adjustment telescopic rod 64 is fixed with the connecting plug, and one end of each guide cavity 63 is connected with a discharge pipe;
a collar body 66 coaxially fixed in the guide chamber 63; and
the sealing plug is connected below the connecting plug through a plurality of telescopic guide rods 65, the sealing plug can seal and plug the shaft ring body 66, and a plurality of exhaust inner holes are further formed in the circumference of the shaft ring body 66, namely, the primarily compressed coal bed gas can be exhausted into each guide cavity through the connecting pipe, the shaft ring body is sealed and plugged by the sealing plug in displacement, and at the moment, the coal bed gas is in the guide cavity and is subjected to high-strength gas compression in continuous displacement of the connecting plug, so that the compression concentration is improved; especially, a plurality of direction chambeies can correspond and divide into groups, and can carry out different intensity compression work in each divides into groups, only need guarantee that later stage mixed concentration is higher than production standard can, avoid gas compression explosion.
As a preferred embodiment, the branched purification assembly 4 comprises:
an inflow pipe 7 which is communicated with an external flow supply pump (not shown in the figure); the device is used for conveying absorption liquid, and can effectively absorb and purify particle dust in the coal bed gas;
the inner flow bin 41 is communicated with the inflow pipe 7, and a plurality of separation cavities 42 are arranged below the inner flow bin 41;
a seepage layer 43 vertically arranged in each separation cavity 42;
the built-in motor 44 is arranged on the inflow pipe 7, a stirring shaft is vertically fixed at the output end of the built-in motor 44, and the stirring shaft is rotatably connected on the seepage layer 43 in a penetrating way;
an inlet pipe 45 communicated with the multistage compression assembly 3, and the other end of the inlet pipe 45 is communicated with each separation cavity 42 through a plurality of lateral flow pipes 46; that is, the inflow pipe can convey the absorption liquid into each separation cavity 42, at this time, absorption layers are formed on each seepage layer 43 in the separation cavity 42, and the coal bed gas sequentially passes through each absorption layer from bottom to top to achieve the purification effect;
the outer exhaust pipe 49 is hermetically connected to one side of the upper end face of the inner flow bin 41, a ventilation mesh enclosure 46 is arranged on the inner flow bin 41, and the other end of the outer exhaust pipe 49 is communicated with the collecting pipe;
an outer liquid pipe 48 vertically arranged at one side of the inner flow bin 41 and communicated with each separation cavity 42; and
go up purifier 8, built on stilts in interior flow bin 41 upper end, outer liquid pipe 48's one end with go up purifier 8 and be linked together, outer liquid pipe can carry out the secondary and transmit the absorption liquid to the purifier in, wherein the absorption liquid is owing to under high-speed flow, and the suction particle of unit content absorption liquid is less, goes up purifier and can cooperate and transfer into new absorption liquid in order to carry out corresponding purification work, avoids the extravagant phenomenon of production, improves the feature of environmental protection.
In this embodiment, the upper purification device 8 includes:
a main case 81;
an inner flow pipe 82 vertically fixed in the middle of the main box 81, wherein one end of the inner flow pipe 82 is communicated with the inlet flow pipe 7 and the outer liquid pipe 48;
a main discharge pipe 84 connected to one side of the upper end surface of the main tank 81, the other end of the main discharge pipe 84 being communicated with the manifold; and
and a waste liquid pipe (not shown) communicating with a lower portion of the main housing 81 for discharging the completely used absorption liquid to the outside.
A coal bed gas separation process comprises the following steps:
s1, conveying coal bed gas, wherein the coal bed gas after being mined and filtered is conveyed to a multi-stage compression assembly 3 through a conveying pipe 2;
s2, compressing the coal bed gas, wherein the coal bed gas preferentially enters a front compression device 5, and the coal bed gas is primarily compressed through the front compression device 5 so as to reach a separation concentration, at the moment, 30% of the total conveying amount of the coal bed gas can be conveyed into an upper purification device 8 through a middle pipe 33 for coarse purification treatment, and the rest 70% of the coal bed gas is subjected to secondary compression work through a fine adjustment pressure dividing device 6;
s3, purifying the coal bed gas with high content and high precision, conveying absorption liquid to an inner flow bin 41 through an inflow pipe 7, correspondingly conveying 70% of the coal bed gas to each separation cavity 42 from a fine adjustment pressure dividing device 6 through an air inlet pipe 45, enabling the absorption liquid to be reserved on a seepage layer 43 and gradually seep and flow out, and enabling the coal bed gas to penetrate through each seepage layer 43 to the inner flow bin 41 through auxiliary rotary disturbance of a stirring shaft and to be discharged into an outer exhaust pipe 49 through a ventilation net cover 47 on the inner flow bin 41;
s4, roughly purifying the coal bed gas with low content, directly conveying 30% of the coal bed gas into an upper purifying device 8 from a front-mounted compression device 5 through a middle pipe, and then spraying absorption liquid into a main box body 81 through a jet flow nozzle 83 by the upper purifying device 8 and enabling the absorption liquid to enter a collecting pipe after rough purification;
s5, dehydrating the gas, and adsorbing moisture through a first dehydrating tower 11 and a second dehydrating tower 12;
and S6, gas separation, namely discharging residual oxygen and non-methane combined gas in the coal bed gas through a remover 13, and storing the coal bed gas through a gas storage tank 14.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent substitutions or changes according to the technical solution and the inventive concept of the present invention should be covered by the scope of the present invention.
Claims (9)
1. A coal bed gas separation system which is characterized in that: it includes:
the conveying pipe (2) is communicated with an external air supply pump and is used for discharging and conveying the preliminarily extracted and filtered coal bed gas;
a mounting support (1);
the multistage compression assembly (3) is arranged on the mounting support (1), and one end of the conveying pipe (2) is communicated with the multistage compression assembly (3) and used for compressing the coal bed gas;
the branch purification component (4) is communicated with the multistage compression component (3), and the multistage compression component (3) respectively conveys the coal bed gas with different compression degrees into the branch purification component (4) after the internal compression of the coal bed gas is completed so that the branch purification component (4) can carry out branch purification on the coal bed gas;
the collecting pipe is connected to the output end of the branch purification component (4);
the device comprises a first dehydration tower (11) and a second dehydration tower (12), wherein the first dehydration tower (11) and the second dehydration tower (12) are communicated with each other, one end of a header is communicated with the first dehydration tower (11) and the second dehydration tower (12), so that 80% of the coal bed gas is subjected to rough moisture adsorption preferentially through the first dehydration tower (11), and then is subjected to re-adsorption through the second dehydration tower (12), and simultaneously, the rest 20% of the coal bed gas can be directly subjected to moisture adsorption through the second dehydration tower (12);
a remover (13) communicated with the output end of the second dehydration tower (12); and
and the gas storage tank (14) is communicated with the remover (13) and is used for timely storing the separated pure coal bed gas.
2. A coal bed methane separation system according to claim 1, wherein: the multistage compression assembly (3) comprises:
the outer cylinder part (31) is transversely fixed on the upper end face of the mounting support (1) through a support body;
the front compression device (5) is vertically fixed in the outer cylinder part (31);
an inner connecting pipe (32) connected to one end of the conveying pipe (2), and the other end of the inner connecting pipe (32) is communicated with the front compression device (5);
the fine adjustment pressure dividing device (6) is arranged in the outer cylinder part (31), and the fine adjustment pressure dividing device (6) is communicated with the front compression device (5) through a connecting pipe (33);
the middle pipe (35) is vertically communicated with the connecting pipe (33), and one end of the middle pipe (35) is communicated with the branch purifying assembly (4); and
the external connecting pipe (34) is connected to one side of the fine adjustment pressure dividing device (6), and the other end of the external connecting pipe (34) is communicated with the branch purification assembly (4).
3. A coal bed methane separation system according to claim 2, wherein: the middle pipe (35) can convey 30% of the total conveying amount of the coal bed gas to one purification branch in the branch purification assembly (4); and the external connecting pipe (34) can convey the residual 70% of the coal bed gas to the other purification branch in the branch purification assembly (4).
4. A coal bed methane separation system according to claim 2, wherein: the pre-compression device (5) comprises:
a compression bin (51);
the inner pressing piece (53) is arranged in the compression bin (51) in a sliding mode;
the main rotating disc (52) is rotatably erected above the compression bin (51), a transmission rod is hinged to the main rotating disc (52), and one end of the transmission rod is connected with the inner pressing piece (53);
the piston piece (54) is arranged in the compression bin (51) in a sliding mode and located below the inner pressing piece (53), and the piston piece (54) is connected with the inner pressing piece (53) through a supporting spring (55); and
and the inner limiting sleeve (56) is coaxially fixed in the compression bin (51).
5. A coal bed methane separation system according to claim 4, wherein: further comprising:
the inner shaft plate (58) is arranged in the piston piece (54) in a sealing and sliding mode, and the inner shaft plate (58) is fixed with the inner pressing piece (53) through a telescopic adjusting column;
the inner shaft plug (57) is coaxially and slidably arranged in the piston piece (54), and the inner shaft plug (57) is in sliding fit with the inner limiting sleeve (56);
and a plurality of connecting springs arranged in a row, wherein each connecting spring is connected between the inner shaft plate (58) and the inner shaft plug (57).
6. A coal bed methane separation system according to claim 2, wherein: the fine adjustment voltage divider (6) comprises:
a general cavity (61);
the telescopic cylinders (62) are symmetrically fixed on the outer cylinder piece (31), the row pressing plates are arranged in the main cavity (61) in a sealing sliding mode, and the output ends of the telescopic cylinders (62) are communicated with the row pressing plates;
the guide cavity (63) is vertically arranged and communicated on the main cavity body (61);
the fine adjustment telescopic rod (64) is coaxially fixed on the guide cavity (63), a connecting plug is arranged in the guide cavity (63) in a sliding mode, the output end of the fine adjustment telescopic rod (64) is fixed with the connecting plug, and one end of each guide cavity (63) is connected with a discharge pipe;
a collar body (66) coaxially fixed within the guide chamber (63); and
the sealing plug is connected below the connecting plug through a plurality of telescopic guide rods (65), the sealing plug can seal and block the shaft ring body (66), and a plurality of exhaust inner holes are formed in the shaft ring body (66) in the circumferential direction.
7. A coal bed methane separation system according to claim 1, wherein: the branch purge assembly (4) comprises:
the inflow pipe (7) is communicated with an external flow supply pump;
the inner flow bin (41) is communicated with the flow inlet pipe (7), and a plurality of separation cavities (42) are arranged below the inner flow bin (41);
seepage layers (43) vertically arranged in each separation cavity (42);
the built-in motor (44) is installed on the inflow pipe (7), a stirring shaft is vertically fixed at the output end of the built-in motor (44), and the stirring shaft is rotatably connected to the seepage layer (43) in a penetrating mode;
the air inlet pipe (45) is communicated with the multistage compression assembly (3), and the other end of the air inlet pipe (45) is communicated with each separation cavity (42) through a plurality of lateral flow pipes (46);
the outer exhaust pipe (49) is connected to one side of the upper end face of the inner flow bin (41) in a sealing mode, a ventilation mesh cover (47) is arranged on the inner flow bin (41), and the other end of the outer exhaust pipe (49) is communicated with the collecting pipe;
the outer liquid pipe (48) is vertically erected on one side of the inner flow bin (41) and is communicated with each separation cavity (42); and
and the upper purifying device (8) is arranged on the upper end of the inner flow bin (41) in an overhead mode, and one end of the outer liquid pipe (48) is communicated with the upper purifying device (8).
8. A coal bed methane separation system according to claim 7, wherein: the upper purification device (8) comprises:
a main box (81);
the inner flow pipe (82) is vertically fixed in the middle of the main box body (81), and one end of the inner flow pipe (82) is communicated with the flow inlet pipe (7) and the outer liquid pipe (48);
jet nozzles (83) arranged in a circumferential array on the inner flow tube (82);
the main discharge pipe (84) is connected to one side of the upper end face of the main box body (81), and the other end of the main discharge pipe (84) is communicated with the collecting pipe; and
and a waste liquid pipe communicated with the lower part of the main box body (81).
9. A coal bed gas separation process is characterized in that: which comprises the following steps:
s1, conveying coal bed gas, wherein the coal bed gas after being mined and filtered is conveyed to a multistage compression assembly (3) through a conveying pipe (2);
s2, compressing the coal bed gas, wherein the coal bed gas preferentially enters a front compression device (5), and the coal bed gas is primarily compressed through the front compression device (5) so as to reach the separation concentration, at the moment, 30% of the total conveying amount of the coal bed gas can be conveyed into an upper purification device (8) through a middle pipe (33) to be subjected to coarse purification treatment, and the rest 70% of the coal bed gas is subjected to secondary compression work through a fine adjustment pressure division device (6);
s3, coal bed gas is purified with high content and precision, an inflow pipe (7) conveys absorption liquid to an inner flow bin (41), at the moment, 70% of the coal bed gas can be correspondingly conveyed to each separation cavity (42) from a fine adjustment pressure dividing device (6) through an air inlet pipe (45), the absorption liquid can be remained on a seepage layer (43) and gradually seeps out, and a stirring shaft assists in rotating and disturbing, so that the coal bed gas penetrates through each seepage layer (43) to the inner flow bin (41) and is discharged into an outer exhaust pipe (49) through a ventilation mesh enclosure (47) on the inner flow bin (41);
s4, roughly purifying the coal bed gas with low content, directly conveying 30% of the coal bed gas into an upper purifying device (8) from a front-mounted compression device (5) through a middle pipe, spraying absorption liquid into a main box body (81) through a jet flow nozzle (83) by the upper purifying device (8), roughly purifying and then feeding the absorption liquid into a collecting pipe;
s5, dehydrating the gas, and adsorbing moisture through a first dehydrating tower (11) and a second dehydrating tower (12);
s6, gas separation, namely discharging residual oxygen and non-methane combined gas in the coal bed gas through a remover (13), and storing the coal bed gas through a gas storage tank (14).
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Effective date of registration: 20231226 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: PetroChina Company Limited Patentee after: PETROCHINA COALBED METHANE Co.,Ltd. Patentee after: CHINA UNITED COALBED METHANE NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. Address before: 100095 floor 1-5, building 1, yard 7, Dijin Road, Haidian District, Beijing Patentee before: CHINA UNITED COALBED METHANE NATIONAL ENGINEERING RESEARCH CENTER Co.,Ltd. |
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