CN114837649B - Coal bed gas separation system and process - Google Patents
Coal bed gas separation system and process Download PDFInfo
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- CN114837649B CN114837649B CN202210474541.2A CN202210474541A CN114837649B CN 114837649 B CN114837649 B CN 114837649B CN 202210474541 A CN202210474541 A CN 202210474541A CN 114837649 B CN114837649 B CN 114837649B
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- 239000003245 coal Substances 0.000 title claims abstract description 87
- 238000000926 separation method Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title description 9
- 230000006835 compression Effects 0.000 claims abstract description 92
- 238000007906 compression Methods 0.000 claims abstract description 92
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 92
- 238000000746 purification Methods 0.000 claims abstract description 64
- 238000003860 storage Methods 0.000 claims abstract description 9
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 119
- 239000007788 liquid Substances 0.000 claims description 32
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 238000007789 sealing Methods 0.000 claims description 16
- 238000003825 pressing Methods 0.000 claims description 13
- 238000001179 sorption measurement Methods 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 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
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000005325 percolation Methods 0.000 claims description 2
- 230000018044 dehydration Effects 0.000 description 16
- 238000006297 dehydration reaction Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning 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
- 239000008187 granular material Substances 0.000 description 1
- 210000000567 greater sac Anatomy 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Separation Of Gases By Adsorption (AREA)
Abstract
The invention discloses a coalbed methane separation system, which comprises: the conveying pipe is communicated with the external air supply pump and is used for carrying out discharging conveying on the primarily extracted and filtered coal bed gas; a mounting 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 assembly is communicated with the multi-stage compression assembly, and the multi-stage compression assembly respectively conveys the coalbed methane with different compression degrees into the branch purification assembly after the coalbed methane is compressed in the multi-stage compression assembly; a header connected to an output end of the branch purification assembly; the first dehydrating tower and the second dehydrating tower are communicated with each other, and one end of the collecting pipe is communicated with the first dehydrating tower and the second dehydrating tower; the remover is communicated with the output end of the second dehydrating 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 bed gas is required to be extracted in a mine channel to ensure the safety of coal mining while the coal mine is mined, 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 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 economy of coal mine production. The device for separating methane from the oxygen-containing coal bed gas is mainly provided with a special deoxidizing system or a refrigerating system and a refrigerant storage and filling system, has complex flow, more heat exchange devices, more equipment quantity and high treatment energy consumption, and simultaneously requires certain pressure to realize better separation of the coal bed gas, but the lower the pressure is, the safer the lower the pressure is, so the device has certain problems in economy and safety; particularly, the required compression strength of the coalbed methane is different under different concentrations, and the single compression purification can meet the purification requirement, but the drainage efficiency is low, the subsequent separation working efficiency is seriously affected, and the working time is increased;
accordingly, one skilled in the art would be able to provide a coalbed methane separation system and process that addresses the problems set forth in the background.
Disclosure of Invention
In order to achieve the above purpose, the present invention provides the following technical solutions: a coalbed methane separation system, comprising:
the conveying pipe is communicated with the external air supply pump and is used for carrying out discharging conveying on the primarily extracted and filtered coal bed gas;
a mounting 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 assembly is communicated with the multi-stage compression assembly, and the multi-stage compression assembly respectively conveys the coalbed methane with different compression degrees into the branch purification assembly after the coalbed methane is compressed in the multi-stage compression assembly, so that the branch purification assembly can carry out branch purification on the coalbed methane;
a header connected to an output end of the branch purification assembly;
the first dehydration tower and the second dehydration tower are communicated with each other, one end of the collecting pipe is communicated with the first dehydration tower and the second dehydration tower, so that 80% of coal bed gas is subjected to rough water adsorption preferentially through the first dehydration tower, then the second dehydration tower is used for re-adsorption, and meanwhile, the rest 20% of coal bed gas can be directly subjected to water adsorption through the second dehydration tower;
the remover is communicated with the output end of the second dehydrating 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 multi-stage compression assembly includes:
the outer cylinder is transversely fixed on the upper end face of the mounting support through a bracket body;
the front compression device is vertically fixed in the outer barrel;
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 and is 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
and the outer connecting pipe is connected to one side of the fine-adjustment pressure dividing device, and the other end of the outer connecting pipe is communicated with the branch purification assembly.
Further preferably, the intermediate pipe is capable of delivering 30% of the total amount of coalbed methane delivery to one of the purification branches of the branching purification assembly; and the external connection pipe can convey the residual 70% of coal bed gas to the other purification branch in the branch purification assembly.
Further, preferably, the pre-compression device includes:
a compression bin;
an inner pressing piece which is arranged in the compression bin in a sliding way;
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 manner and is positioned below the inner pressing piece, and the piston piece is connected with the inner pressing piece through a supporting spring; and
the inner limit sleeve is coaxially fixed in the compression bin.
Further, preferably, the method further comprises:
the inner shaft plate is arranged in the piston part in a sealing sliding manner, and is fixed with the inner pressing part through a telescopic adjusting column;
the inner shaft plug is coaxially arranged in the piston piece in a sliding way, and is matched with the inner limit sleeve in a sliding way;
and the connecting springs are arranged in a plurality, and each connecting spring is connected between the inner shaft plate and the inner shaft plug.
Further, preferably, the fine adjustment voltage dividing device includes:
a general cavity;
the telescopic cylinder is symmetrically fixed on the outer cylinder, a pressure discharge plate is arranged in the total cavity in a sealing sliding manner, and the output end of the telescopic cylinder is communicated with the pressure discharge plate;
the guide cavity is vertically arranged and communicated with the main cavity;
the fine-tuning 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-tuning 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 block the shaft ring body, and a plurality of exhaust inner holes are further formed in the circumference of the shaft ring body.
Further, preferably, the branch purifying assembly includes:
the inflow pipe is communicated with an external flow supply pump;
the inner flow bin is communicated with the inflow 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 inflow pipe, the output end of the built-in motor is vertically fixed with a stirring shaft, and the stirring shaft is rotationally connected on the seepage layer in a penetrating way;
the air inlet pipe is communicated with the multi-stage compression assembly, and the other end of the air inlet pipe is communicated with each separation cavity through a plurality of side flow pipes;
the outer exhaust pipe is connected to one side of the upper end face of the inner flow bin in a sealing way, a ventilation net cover is arranged on the inner flow bin, and the other end of the outer exhaust pipe is communicated with the collecting pipe;
the outer liquid pipe is vertically erected on one side of the inner flow bin and is communicated with each separation cavity; and
the upper purifying device is overhead at the upper end of the inner flow bin, and one end of the outer liquid pipe is communicated with the upper purifying device.
Further, preferably, the upper purifying device includes:
a main case;
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 inflow pipe and the outer liquid pipe;
the jet flow nozzle is circumferentially arranged on the inner flow pipe;
the main calandria is connected to one side of the upper end face of the main box body, and the other end of the main calandria 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 comprising the steps of:
s1, conveying the coal bed gas, namely conveying the mined and filtered coal bed gas to a multi-stage compression assembly through a conveying pipe;
s2, compressing the coal bed gas, wherein the coal bed gas firstly enters a pre-compression device, and primarily compresses the coal bed gas through the pre-compression device so that the coal bed gas can reach separation concentration, at the moment, 30% of the total coal bed gas can be conveyed into an upper purification device through an intermediate pipe for coarse purification treatment, and the remaining 70% of the coal bed gas is subjected to secondary compression through a fine-adjustment partial pressure device;
s3, purifying the large content of the coal bed gas with precision, and conveying an absorption liquid to an inner flow bin by a flow inlet pipe, wherein 70% of the coal bed gas can be correspondingly conveyed to each separation cavity from a fine-adjustment pressure dividing device through an air inlet pipe, the absorption liquid can be reserved on a seepage layer and gradually infiltrate and flow out, and a stirring shaft assists in rotating disturbance, so that the coal bed gas passes through each seepage layer to the inner flow bin and is discharged into an outer exhaust pipe through an air permeable net cover on the inner flow bin;
s4, roughly purifying low-content coal bed gas, wherein the middle pipe directly conveys 30% coal bed gas from the front compression device to the upper purification device, at the moment, the upper purification device can spray absorption liquid into the main box body through the jet nozzle, and the absorption liquid enters the collecting pipe after roughly purifying;
s5, dehydrating the gas, and carrying out water adsorption through a first dehydrating tower and a second dehydrating tower;
s6, separating gas, discharging residual oxygen and non-methane combined gas in the coal bed gas through a remover, and storing the coal bed gas through a gas storage tank.
Compared with the prior art, the invention has the beneficial effects that:
the mined coalbed methane can be compressed in different intensities through the multi-stage compression assembly, at the moment, the front-end compression device is used for conveying 30% of the total coalbed methane conveying amount to the upper purification device in the branch purification assembly through the middle pipe, the rest 70% of the coalbed methane is subjected to secondary compression through the fine adjustment partial pressure device, so that high-concentration gas is formed, low-concentration gas is subjected to rough purification through the branch purification assembly, and high-concentration gas is subjected to precision purification through the branch purification assembly, so that the purification effect is ensured while the compression concentration of the coalbed methane is ensured.
Drawings
FIG. 1 is a schematic diagram of the structure 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 front compression device according to the present invention;
FIG. 4 is a schematic diagram of a fine tuning voltage divider according to the present invention;
FIG. 5 is a schematic diagram of a branch purification assembly according to the present invention;
FIG. 6 is a schematic view of the structure of the upper purifying device in the present invention;
in the figure: the device comprises a mounting support, a first dehydration tower, a second dehydration tower, a 13 remover, a 14 air storage tank, a 2 conveying pipe, a 3-stage compression assembly, a 31 outer cylinder, a 32 inner connecting pipe, a 33 connecting pipe, a 34 outer connecting pipe, a 35 middle pipe, a 4-branch purification assembly, a 41 inner flow bin, a 42 separation cavity, a 43 seepage layer, a 44 built-in motor, a 45 air inlet pipe, a 46 side flow pipe, a 47 air-permeable net cover, a 48 outer liquid pipe, a 49 outer exhaust pipe, a 5 pre-compression device, a 51 compression bin, a 52 main rotating disk, a 53 inner compression part, a 54 piston, a 55 supporting spring, a 56 inner limit sleeve, a 57 inner shaft plug, a 58 inner shaft plate, a 6 fine adjustment pressure dividing device, a 61 total cavity, a 62 telescopic cylinder, a 63 guide cavity, a 64 fine adjustment telescopic rod, a 65 telescopic guide rod, a 66 shaft ring body, a 7 inlet pipe, an 8 upper purification device, a 81 main box body, an 82 inner flow pipe, a 83 jet nozzle and a 84 main exhaust pipe.
Description of the embodiments
Referring to fig. 1, in an embodiment of the present invention, a coalbed methane separation system includes:
the conveying pipe 2 is communicated with an external air supply pump and is used for carrying out discharge conveying on the primarily 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 coalbed methane;
the branch purification assembly 4 is communicated with the multi-stage compression assembly 3, and the multi-stage compression assembly 3 respectively conveys the coalbed methane with different compression degrees into the branch purification assembly 4 after the coalbed methane is compressed in the multi-stage compression assembly 3, so that the branch purification assembly 4 can carry out branch purification on the coalbed methane; that is, the low-concentration gas and the high-concentration gas can be formed after the coalbed methane is compressed, at this time, 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 compressed concentration and the purification degree of the gas in the later gas mixing reach the process standard, and the gas production treatment efficiency is improved.
A header connected to the output end of the branch purification module 4;
the first dehydration tower 11 and the second dehydration tower 12 are communicated with each other, one end of the collecting pipe is communicated with the first dehydration tower 11 and the second dehydration tower 12, so that 80% of coal bed gas is subjected to rough water adsorption preferentially through the first dehydration tower 11, then the second dehydration tower 12 is subjected to re-adsorption, and meanwhile, the rest 20% of coal bed gas can be directly subjected to water adsorption through the second dehydration tower 12; the treatment efficiency is further improved so as to adapt to the high-strength continuous coalbed methane exploitation treatment;
a remover 13 communicated with the output end of the second dehydrating 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 multi-stage compression assembly 3 includes:
an outer cylinder 31 transversely fixed to the upper end surface of the mounting bracket 1 by a bracket body;
the front compression device 5 is vertically fixed in the outer cylinder 31;
an inner connecting pipe 32 connected to one end of the delivery pipe 2, and the other end of the inner connecting pipe 32 is communicated with the pre-compression device 5;
the fine adjustment pressure dividing device 6 is arranged in the outer cylinder 31, and the fine adjustment pressure dividing device 6 is communicated with the front compression device 5 through a connecting pipe 33;
an intermediate pipe 35 vertically connected to the connection pipe 33, one end of the intermediate pipe 35 being connected to the branch purification module 4; and
and the external connection pipe 34 is connected to one side of the fine-adjustment pressure dividing device 6, and the other end of the external connection pipe 34 is communicated with the branch purification assembly 4.
As a preferred embodiment, the intermediate pipe 35 is capable of delivering 30% of the total amount of coalbed methane delivered to one of the purification branches of the branch purification assembly 4; the external connection pipe 34 can convey the remaining 70% of coalbed methane to another purification branch in the branch purification assembly 4, that is, after the mined coalbed methane is primarily compressed by the pre-compression device, the coalbed methane reaches a certain concentration (which can be lower than the coalbed methane concentration standard), at this time, the 70% of coalbed methane can be secondarily compressed by the fine adjustment partial pressure device, and high-concentration gas is formed, and the gas with different concentrations is mixed after corresponding purification treatment, at this time, the compressed concentration of the gas in the mixed state is the gas concentration to be separated, so that the time-consuming processing length of the gas under continuous high-intensity compression is reduced, and especially, the gas explosion under high-intensity work can be avoided.
In this embodiment, the pre-compression device 5 includes:
a compression bin 51;
an inner presser 53 slidably disposed within the compression pocket 51;
a main rotating disc 52 rotatably mounted above the compression bin 51, wherein 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, the piston member 54 being connected to the inner pressing member 53 by a support spring 55; and
the inner limit sleeve 56 is coaxially fixed in the compression bin 51, wherein the main rotary disk can drive the piston member to compress 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 pressure 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 matched with the 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 normal operation, the telescopic adjusting column is in a contracted state, the space between the inner pressing piece and the piston piece is smaller at the moment, the supporting springs are in a compressed state, and the piston piece is not abutted against and contacted with the inner limiting sleeve in vertical reciprocating displacement; especially, the front-end compression device can also compress gas with relatively high strength, the telescopic adjusting column is in an extending state, the supporting spring is in a normal stretching state, the piston piece is propped against and contacted with the inner limit sleeve in vertical reciprocating displacement, so that gas enters the inner limit sleeve, and the inner shaft plug can slide at the lowest point position through the telescopic adjusting column to extend into the inner limit sleeve for high-strength compression, so that the compression concentration of the coal seam gas in the front-end stage is improved.
In this embodiment, the fine adjustment voltage dividing device 6 includes:
a total cavity 61;
the telescopic cylinder 62 is symmetrically fixed on the outer cylinder 31, a pressure discharge plate is arranged in the total cavity 61 in a sealing sliding manner, and the output end of the telescopic cylinder 62 is communicated with the pressure discharge plate;
a guide chamber 63 vertically arranged to communicate with the main chamber 61;
the fine adjustment telescopic rods 64 are coaxially fixed on the guide cavities 63, connecting plugs are slidably arranged in the guide cavities 63, the output ends of the fine adjustment telescopic rods 64 are fixed with the connecting plugs, and one end of each guide cavity 63 is connected with a discharge pipe;
the shaft ring body 66 is coaxially fixed in the guide cavity 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 also circumferentially arranged on the shaft ring body 66, namely, the primarily compressed coal bed gas can be discharged into each guide cavity through the connecting pipe, the shaft ring body is sealed and blocked in the displacement process by the sealing plug, and at the moment, the coal bed gas is positioned in the guide cavities and compressed by high-strength gas in the continuous displacement process of the connecting plug, so that the compression concentration is improved; in particular, a plurality of guide cavities can be correspondingly grouped, and compression work with different intensities can be carried out in each group, so that the later mixing concentration is only required to be ensured to be higher than the production standard, and gas compression explosion is avoided.
As a preferred embodiment, the branch cleaning assembly 4 comprises:
a inflow pipe 7 which communicates with an external supply pump (not shown); the device is used for conveying the absorption liquid, and can effectively absorb and purify particle dust in the coal bed gas;
an inner flow bin 41 communicated with the inflow pipe 7, wherein a plurality of separation cavities 42 are arranged below the inner flow bin 41;
a percolation layer 43 vertically arranged in each of the separation chambers 42;
a built-in motor 44, which is installed on the inflow pipe 7, wherein a stirring shaft is vertically fixed at the output end of the built-in motor 44, and the stirring shaft is rotationally connected on the seepage layer 43 in a penetrating way;
an intake pipe 45 communicating with the multi-stage compression assembly 3, the other end of the intake pipe 45 communicating with each of the separation chambers 42 through a plurality of side flow pipes 46; that is, the inflow pipe can convey the absorption liquid into each separation cavity 42, at this time, an absorption layer is formed on each seepage layer 43 in the separation cavity 42, and the coalbed methane sequentially passes through each absorption layer from bottom to top to achieve the purification effect;
an outer exhaust pipe 49, which is connected to one side of the upper end surface of the inner flow bin 41 in a sealing manner, wherein the inner flow bin 41 is provided with an air-permeable net cover 46, and the other end of the outer exhaust pipe 49 is communicated with the collecting pipe;
an outer liquid pipe 48 vertically installed at one side of the inner flow chamber 41 and communicated with each of the separation chambers 42; and
go up purifier 8, it is overhead in interior flow storehouse 41 upper end, the one end of outer liquid pipe 48 with go up purifier 8 and be linked together, outer liquid pipe can carry out secondary transfer to upward purifier with the absorption liquid in, wherein the absorption liquid is because under high-speed flow, and the absorption granule of unit content absorption liquid is less, goes up purifier and can cooperate to 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 purifying 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 inflow pipe 7 and the outer liquid pipe 48;
jet heads 83, circumferentially arrayed on said inner flow tube 82;
a main drain pipe 84 connected to one side of the upper end surface of the main housing 81, and the other end of the main drain pipe 84 communicates with a collecting pipe; and
a waste liquid pipe (not shown) is communicated below the main tank 81 for discharging the completely used absorption liquid to the outside.
A coal bed gas separation process comprising the steps of:
s1, conveying the coal bed gas, namely conveying the mined and filtered coal bed gas to a multistage compression assembly 3 through a conveying pipe 2;
s2, compressing the coal bed gas, wherein the coal bed gas firstly enters a pre-compression device 5, the pre-compression device 5 is used for primarily compressing the coal bed gas so that the coal bed gas can reach separation concentration, at the moment, 30% of the total coal bed gas can be conveyed into an upper purification device 8 through an intermediate pipe 35 for coarse purification treatment, and the remaining 70% of the coal bed gas is subjected to secondary compression through a fine-adjustment partial pressure device 6;
s3, purifying the large content of the coal bed gas with precision, and conveying an absorption liquid to the inner flow bin 41 by the inflow pipe 7, wherein at the moment, 70% of the coal bed gas can be correspondingly conveyed to each separation cavity 42 from the fine-adjustment pressure dividing device 6 through the air inlet pipe 45, the absorption liquid can be reserved on the seepage layers 43 and gradually infiltrate and flow out, and the stirring shaft assists in rotating disturbance, so that the coal bed gas passes through each seepage layer 43 to the inner flow bin 41 and is discharged to the outer exhaust pipe 49 through the air-permeable net cover 47 on the inner flow bin 41;
s4, roughly purifying low-content coal bed gas, wherein 30% coal bed gas is directly conveyed into the upper purifying device 8 from the front compressing device 5 by the middle pipe, at the moment, the upper purifying device 8 can spray absorption liquid into the main box body 81 through the jet nozzle 83, and enters the collecting pipe after roughly purifying;
s5, dehydrating the gas, and carrying out water adsorption through a first dehydrating tower 11 and a second dehydrating tower 12;
s6, separating gas, 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 foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. A coalbed methane separation system, characterized by: it comprises the following steps:
the conveying pipe (2) is communicated with an external air supply pump and is used for carrying out discharge conveying on the primarily 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 assembly (4) is communicated with the multi-stage compression assembly (3), and the multi-stage compression assembly (3) respectively conveys the coalbed methane with different compression degrees into the branch purification assembly (4) after the internal compression of the coalbed methane is completed, so that the branch purification assembly (4) can carry out branch purification on the coalbed methane;
a header connected to the output end of the branch purification assembly (4);
the system comprises a first dehydrating tower (11) and a second dehydrating tower (12), wherein one end of a collecting pipe is communicated with the first dehydrating tower (11) and the second dehydrating tower (12) so as to enable 80% of coal bed gas to be subjected to rough water adsorption preferentially through the first dehydrating tower (11) and then subjected to re-adsorption through the second dehydrating tower (12), and meanwhile the rest 20% of coal bed gas can be directly subjected to water adsorption through the second dehydrating tower (12);
the remover (13) is communicated with the output end of the second dehydrating tower (12); and
the gas storage tank (14) is communicated with the remover (13) and is used for timely storing the separated pure coal bed gas;
the multi-stage compression assembly (3) comprises:
the outer cylinder (31) is transversely fixed on the upper end surface of the mounting support (1) through a bracket body;
the front compression device (5) is vertically fixed in the outer barrel (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 (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
the external connection pipe (34) is connected to one side of the fine adjustment pressure dividing device (6), and the other end of the external connection pipe (34) is communicated with the branch purification assembly (4);
the intermediate pipe (35) can convey 30% of the total amount of coal bed gas to one purification branch of the branch purification assembly (4); and the external connection pipe (34) can convey the residual 70% of coal bed gas to the other purification branch in the branch purification assembly (4).
2. A coalbed methane separation system as in claim 1 wherein: the pre-compression device (5) comprises:
a compression bin (51);
an inner pressing piece (53) which is arranged in the compression bin (51) in a sliding manner;
the main rotating disc (52) is rotatably arranged 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 manner and is positioned 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
the inner limit sleeve (56) is coaxially fixed in the compression bin (51).
3. A coalbed methane separation system as in claim 2 wherein: the pre-compression device (5) further comprises:
an inner shaft plate (58) which is arranged in the piston member (54) in a sealing sliding manner, wherein the inner shaft plate (58) is fixed with the inner pressure member (53) through a telescopic adjusting column;
the inner shaft plug (57) is coaxially arranged in the piston piece (54) in a sliding manner, and the inner shaft plug (57) is matched with the inner limit sleeve (56) in a sliding manner;
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).
4. A coalbed methane separation system as in claim 1 wherein: the fine-tuning voltage divider (6) comprises:
a total cavity (61);
the telescopic air cylinders (62) are symmetrically fixed on the outer cylinder (31), a pressure discharge plate is arranged in the total cavity (61) in a sealing sliding manner, and the output ends of the telescopic air cylinders (62) are communicated with the pressure discharge plate;
a guide cavity (63) vertically arranged and communicated with the main cavity (61);
the fine-tuning telescopic rods (64) are coaxially fixed on the guide cavities (63), connecting plugs are arranged in the guide cavities (63) in a sliding mode, the output ends of the fine-tuning telescopic rods (64) are fixed with the connecting plugs, and one end of each guide cavity (63) is connected with a discharge pipe;
the shaft ring body (66) is coaxially fixed in the guide cavity (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 further circumferentially arranged on the shaft ring body (66).
5. A coalbed methane separation system as in claim 1 wherein: the branch purification assembly (4) comprises:
a flow inlet pipe (7) communicated with an external flow supply pump;
an inner flow bin (41) communicated with the inflow pipe (7), wherein a plurality of separation cavities (42) are arranged below the inner flow bin (41);
a percolation layer (43) vertically arranged inside each of the separation chambers (42);
a 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 rotationally connected on the seepage layer (43) in a penetrating way;
an air inlet pipe (45) communicated with the multi-stage compression assembly (3), wherein the other end of the air inlet pipe (45) is communicated with each separation cavity (42) through a plurality of side flow pipes (46);
an outer exhaust pipe (49) is connected to one side of the upper end face of the inner flow bin (41) in a sealing way, an air permeable net 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;
an outer liquid pipe (48) vertically erected on one side of the inner flow bin (41) and communicated with each separation cavity (42); and
the upper purifying device (8) is overhead at the upper end of the inner flow bin (41), and one end of the outer liquid pipe (48) is communicated with the upper purifying device (8).
6. A coalbed methane separation system as in claim 5 wherein: the upper purification device (8) comprises:
a main case (81);
an inner flow pipe (82) vertically fixed in the middle of the main box body (81), wherein one end of the inner flow pipe (82) is communicated with the inflow pipe (7) and the outer liquid pipe (48);
a jet nozzle (83) circumferentially arranged on the inner flow tube (82);
a main drain pipe (84) connected to one side of the upper end surface of the main case (81), and the other end of the main drain pipe (84) is communicated with a collecting pipe; and
and a waste liquid pipe communicated below the main box body (81).
7. The coalbed methane separation process of a coalbed methane separation system as recited in claim 6, wherein: which comprises the following steps:
s1, conveying the coal bed gas, namely conveying the mined and filtered coal bed gas to a multistage compression assembly (3) through a conveying pipe (2);
s2, compressing the coal bed gas, wherein the coal bed gas firstly enters a pre-compression device (5), the pre-compression device (5) is used for primarily compressing the coal bed gas so that the coal bed gas can reach separation concentration, at the moment, 30% of the total coal bed gas can be conveyed into an upper purification device (8) through an intermediate pipe (35) for coarse purification treatment, and the remaining 70% of the coal bed gas is subjected to secondary compression through a fine-adjustment pressure-dividing device (6);
s3, purifying the large content of the coal bed gas with precision, wherein an inflow pipe (7) conveys an 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 reserved on a seepage layer (43) and gradually infiltrate and flow out, and a stirring shaft assists in rotating disturbance, so that the coal bed gas passes through each seepage layer (43) to the inner flow bin (41) and is discharged into an outer exhaust pipe (49) through an air permeable net cover (47) on the inner flow bin (41);
s4, roughly purifying low-content coal bed gas, wherein 30% coal bed gas is directly conveyed into an upper purifying device (8) from a front compressing device (5) through a middle pipe, at the moment, the upper purifying device (8) can spray absorption liquid into a main box body (81) through a jet nozzle (83), and the absorption liquid enters a collecting pipe after roughly purifying;
s5, dehydrating the gas, and carrying out moisture absorption through a first dehydrating tower (11) and a second dehydrating tower (12);
s6, separating gas, 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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