CN113913218A

CN113913218A - Methane purification device

Info

Publication number: CN113913218A
Application number: CN202111215877.9A
Authority: CN
Inventors: 杨建淅; 蒋伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-10-19
Filing date: 2021-10-19
Publication date: 2022-01-11

Abstract

The invention relates to the field of methane purification, in particular to a methane purification device, which comprises a cooling box and a cooling generator, wherein a liquid storage box is fixedly arranged in the cooling box, a fourth device box is fixedly arranged at the upper end of the left side of the cooling box, a fourth air passing pipe is fixedly connected at the upper end of the right side of the liquid storage box, a first device box is fixedly arranged at the lower end of the left side of the cooling box, a third air passing pipe is fixedly connected at the other end of the fourth air passing pipe, an air conveying cavity is communicated with the first device box, a rotating fan is arranged in the air conveying cavity, a first rotating shaft is fixedly connected at the position of the center of a circle at the left side of the rotating fan, a fixed frame is fixedly arranged in the second device box at the left side of the air conveying cavity, a first rotating cylinder is rotatably arranged in the fixed frame, a first rotating groove is arranged on the first rotating cylinder, the other end of the connecting rod is rotatably connected with an air pushing plate, and the air pushing plate is movably arranged in the third device box, so that not only circulating low-temperature pretreatment can be carried out on raw gas, and the liquid miscellaneous gas in the purified methane gas can be repeatedly filtered and removed.

Description

Methane purification device

Technical Field

The invention relates to the field of methane purification, in particular to a methane purification device.

Background

In the methane purification, the low-temperature condensation purification method is characterized in that the carbon dioxide in the methane is liquefied by utilizing the characteristic of high liquefaction temperature of the carbon dioxide, and the methane component is used as non-condensable gas to be discharged as purified product gas.

After the cryocondensation, the gaseous methane gas separation of liquid miscellaneous gas and gas state, because can carry some liquid miscellaneous gas in the methane gas after the separation, therefore, can reduce the methane gas purity after the separation, need further get rid of the liquid miscellaneous gas in the methane gas, and simultaneously, the methane gas after the cryocondensation carries low temperature energy, these energy can cause the energy extravagant if direct emission, and can increase the cost of enterprises, consequently, need these energies to carry out recycle, because methane is when cryocondensation, gas just can liquefy after having the cooling of a period of time, the separation time that will greatly increased gas, and can increase the consumption of the energy, so need cool down the preliminary treatment to gas, therefore, based on the above-mentioned background, carry out the innovative design to the device.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a methane purification device.

The technical scheme adopted by the invention for solving the technical problems is as follows: a methane purification device comprises a cooling box and a cooling generator, wherein a liquid storage box is fixedly arranged in the cooling box, a fourth device box is fixedly arranged at the upper end of the left side of the cooling box, an air inlet pipe is fixedly arranged in the fourth device box, the other end of the air inlet pipe is fixedly connected with the liquid storage box, a fourth cross air pipe is fixedly connected with the upper end of the right side of the liquid storage box, a first device box is fixedly arranged at the lower end of the left side of the cooling box, a third cross air pipe is fixedly arranged in the first device box, the other end of the fourth cross air pipe is fixedly connected with the third cross air pipe, a second device box is fixedly arranged at the upper side of the first device box, an air transmission cavity is fixedly arranged at the right side of the inner part of the second device box, the air transmission cavity is communicated with the first device box, a rotating fan is arranged in the air transmission cavity, a first rotating shaft is fixedly connected with the position of the center of the left side of the rotating fan, a fixed frame is fixedly arranged in the second device box at the left side of the air transmission cavity, a first rotating cylinder is rotatably arranged in the fixed frame, a first rotary groove is arranged on the first rotary cylinder, a second rotary cylinder is rotatably arranged in the first rotary cylinder, a second rotating groove is arranged on the second rotating cylinder, a shaft motor is fixed at the left end of the first rotating cylinder, a moving column is movably arranged in the first rotating groove, the lower end of the moving column is movably arranged in the second rotating groove, a third device box is fixedly arranged on a cooling box at the upper end of the second device box, the other end of a third air pipe is fixedly connected with the left side of the third device box, the front side of the third device box is communicated with a first air pipe, a rotating wheel is arranged in the third device box, a non-circle center position at the lower side of the rotating wheel is fixedly connected with a rotating rod, the other end of the rotating rod is provided with a sliding groove, and the upper end of the movable column is movably arranged in the sliding groove, the outer side of the rotating wheel is slidably provided with a wheel sleeve, the left side of the wheel sleeve is rotatably connected with a connecting rod, the other end of the connecting rod is rotatably connected with an air pushing plate, and the air pushing plate is movably and hermetically arranged in the third device box.

Specifically, the air inlet pipe comprises a threaded plate, and the threaded plate is fixedly arranged in the air inlet pipe.

Specifically, the third air pipe outside of first device incasement portion rotates the installation and leads the temperature frame, and the temperature frame right-hand member fixed mounting rotary gear that leads outside the third air pipe, second rotary cylinder right side centre of a circle position fixed mounting second rotation axis, and second rotation axis slidable mounting is inside first rotation axis and rotatory fan, second rotation axis other end fixed connection driving gear, and rotary gear and driving gear meshing installation.

Specifically, a filter layer is fixedly arranged in a third device box on the left side of the air pushing plate, and air leakage grooves are formed in the third device box on the upper side and the lower side of the filter layer.

Specifically, the second vent pipe is fixedly installed on the rear side of the second device box, the second vent pipe is in through connection with the gas transmission cavity, the other end of the second vent pipe is in through connection with the rear side of the fourth device box, the front side of the fourth device box is in through connection with the fifth vent pipe, the other end of the fifth vent pipe is fixedly installed on the first device box, and the other end of the fifth vent pipe is in through connection with the first device box.

Specifically, cooling generator, liquid reserve tank front side fixed connection discharging pipe, and discharging pipe fixed mounting is on the cooling tank in cooling tank front side upper end fixed mounting cooling generator.

The invention has the beneficial effects that:

according to the methane purification device, the second vent pipe, the temperature guide frame, the rotating gear, the driving gear, the fifth vent pipe and the rotating fan are matched for use, the gas in the first device box is uniformly cooled by the temperature guide frame through meshing transmission of the rotating gear and the driving gear, and meanwhile, the low-temperature gas is circulated in the first device box and the fourth device box through the second vent pipe and the fifth vent pipe under the centrifugal force action of the rotating fan through the second vent pipe and the fifth vent pipe, so that the cyclic cooling pretreatment of the raw gas is realized.

According to the methane purification device, the first rotary cylinder, the movable column, the rotary rod, the wheel sleeve, the gas pushing plate, the second rotary cylinder and the rotary wheel are matched for use, the movable column drives the rotary rod to rotate, the rotary rod enables the wheel sleeve to drive the connecting rod to move left and right through non-circle center rotation of the rotary wheel, the connecting rod drives the gas pushing plate to move left and right in a third device box, methane gas subjected to low-temperature condensation in the third device box is repeatedly extruded, the methane gas repeatedly passes through the filter layer, repeated filtration of the methane gas in the filter layer is further achieved, liquid miscellaneous gas in the methane gas is further removed, and gas purity of the methane is improved.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic cross-sectional view of section B-B of FIG. 1 according to the present invention;

FIG. 3 is an enlarged view of portion A of FIG. 2 according to the present invention;

FIG. 4 is a schematic cross-sectional view of section C-C of FIG. 1 according to the present invention;

FIG. 5 is a schematic cross-sectional view of the section D-D of FIG. 1 according to the present invention;

FIG. 6 is a schematic structural view of the temperature-guiding frame and the rotary gear of FIG. 2 according to the present invention;

FIG. 7 is a schematic view of the construction of the rotating wheel and wheel sleeve of FIG. 2 in accordance with the present invention;

FIG. 8 is a schematic structural diagram of the fixing frame and the first rotating cylinder of FIG. 2 according to the present invention;

FIG. 9 is a schematic cross-sectional view of section E-E of FIG. 8 according to the present invention;

FIG. 10 is a schematic view of the first rotary drum of FIG. 9 according to the present invention;

FIG. 11 is a schematic view of the second rotary drum of FIG. 9 according to the present invention;

FIG. 12 is a schematic view of the air inlet tube and thread plate of FIG. 4 according to the present invention;

FIG. 13 is a schematic view of the rotary fan of FIG. 2 according to the present invention;

in the figure: 1. a cooling tank; 2. a cooling generator; 3. a first device case; 4. a second device case; 5. a third device case; 6. a first vent pipe; 7. a fourth device case; 8. an air inlet pipe; 9. a second vent pipe; 10. a third vent pipe; 11. a liquid storage tank; 12. a discharge pipe; 13. a fourth air vent pipe; 14. a thread plate; 15. a temperature conduction frame; 16. a rotating gear; 17. a driving gear; 18. a fixed mount; 19. a motor; 20. a first rotating shaft; 21. a first rotary cylinder; 22. a first rotary tank; 23. moving the column; 24. rotating the rod; 25. a fifth ventilation pipe; 26. a wheel sleeve; 27. a connecting rod; 28. a gas pushing plate; 29. a filter layer; 30. a gas release groove; 31. a sliding groove; 32. a second rotary cylinder; 33. a second rotary tank; 34. a second rotation shaft; 35. a rotating wheel; 36. the fan is rotated.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1-13, the methane purifying device according to the present invention comprises a cooling tank 1 and a cooling generator 2, wherein a liquid storage tank 11 is fixedly installed inside the cooling tank 1, a fourth device tank 7 is fixedly installed at the upper end of the left side of the cooling tank 1, an air inlet pipe 8 is fixedly installed inside the fourth device tank 7, the other end of the air inlet pipe 8 is fixedly connected with the liquid storage tank 11, a fourth air inlet pipe 13 is fixedly connected with the upper end of the right side of the liquid storage tank 11, a first device tank 3 is fixedly installed at the lower end of the left side of the cooling tank 1, a third air inlet pipe 10 is fixedly installed inside the first device tank 3, the other end of the fourth air inlet pipe 13 is fixedly connected with the third air inlet pipe 10, a second device tank 4 is fixedly installed at the upper side of the first device tank 3, an air delivery cavity is fixedly arranged at the right side inside the second device tank 4, the air delivery cavity is communicated with the first device tank 3, a rotating fan 36 is arranged inside the air delivery cavity, and the first rotating shaft 20 is fixedly connected at the center position of the left side of the rotating fan 36, a fixed frame 18 is fixedly arranged in the second device box 4 at the left side of the air transmission cavity, a first rotary barrel 21 is rotatably arranged in the fixed frame 18, a first rotary groove 22 is arranged on the first rotary barrel 21, a second rotary barrel 32 is rotatably arranged in the first rotary barrel 21, a second rotary groove 33 is arranged on the second rotary barrel 32, a motor 19 is fixedly connected with the left end of the first rotary barrel 21 through a shaft, a moving column 23 is movably arranged in the first rotary groove 22, the lower end of the moving column 23 is movably arranged in the second rotary groove 33, a third device box 5 is fixedly arranged on a cooling box 1 at the upper end of the second device box 4, the other end of a third air pipe 10 is fixedly connected with the left side of the third device box 5, the front side of the third device box 5 is connected with a first air pipe 6 in a penetrating way, a rotary wheel 35 is arranged in the third device box 5, a rotary rod 24 is fixedly connected at the non-circle center position at the lower side of the rotary wheel 35, and a sliding groove 31 is arranged at the other end of the rotary rod, the upper end of the moving column 23 is movably arranged in the sliding groove 31, the outer side of the rotating wheel 35 is slidably provided with a wheel sleeve 26, the left side of the wheel sleeve 26 is rotatably connected with a connecting rod 27, the other end of the connecting rod 27 is rotatably connected with an air pushing plate 28, the air pushing plate 28 is movably and hermetically arranged in the third device box 5, the motor 19 drives a first rotating cylinder 21 fixedly connected with the first rotating cylinder to rotate, the first rotating cylinder 21 rotates to drive a first rotating shaft 20 fixedly connected with the first rotating cylinder to rotate, the first rotating shaft 20 drives a rotating fan 36 fixedly connected with the first rotating cylinder to rotate, the first rotating cylinder 21 rotates and simultaneously drives a first rotating groove 22 arranged on the first rotating cylinder to synchronously rotate, the first rotating groove 22 rotates to drive the moving column 23 slidably arranged on the first rotating cylinder to horizontally move on the second device box 4, and during the horizontal movement of the moving column 23, at the moment, the moving column 23 drives the lower end of the moving column 23 to horizontally move in the second rotating groove 33, further, the second rotary cylinder 32 is rotated to drive the driving gear 17 to rotate through the second rotary shaft 34 fixedly connected with the second rotary cylinder, the driving gear 17 drives the rotary gear 16 engaged with the second rotary cylinder to rotate, the rotary gear 16 drives the temperature-guiding frame 15 fixedly connected with the rotary gear to rotate circularly outside the third gas-guiding pipe 10, further, the temperature of the low-temperature methane gas in the third gas-guiding pipe 10 is transferred to the gas in the first device box 3, the temperature of the gas in the first device box 3 is reduced to form low-temperature gas, the other end of the movable column 23 moves in the sliding groove 31 of the rotary rod 24 by the left-right translation of the movable column 23, the rotary rod 24 is driven to rotate by the rotary rod 24 in the process of moving in the sliding groove 31, the rotary rod 24 rotates to drive the rotary wheel 35 fixedly connected with the rotary rod 24 to rotate in a non-circle center manner, further, the rotary wheel 35 drives the connecting rod 27 to move left and right through the wheel sleeve 26, the connecting rod 27 drives the gas pushing plate 28 connected with the connecting rod to move horizontally in the third device box 5, so that the connecting rod 27 repeatedly extrudes gas in the third device box 5 on the left side of the connecting rod 27, and methane gas repeatedly passes through the filter layer 29.

Specifically, the air inlet pipe 8 comprises a threaded plate 14, the threaded plate 14 is fixedly installed inside the air inlet pipe 8, and the threaded plate 14 prolongs the cooling pretreatment time of the raw gas by prolonging the flow path of the raw gas.

Specifically, the outside of the third vent pipe 10 inside the first device case 3 is rotatably provided with the temperature guiding frame 15, the temperature guiding frame 15 is made of high heat conduction materials, such as copper, the right end of the temperature guiding frame 15 outside the third vent pipe 10 is fixedly provided with the rotating gear 16, the right circle center position of the second rotating cylinder 32 is fixedly provided with the second rotating shaft 34, the second rotating shaft 34 is slidably arranged inside the first rotating shaft 20 and the rotating fan 36, the other end of the second rotating shaft 34 is fixedly connected with the driving gear 17, and the rotating gear 16 and the driving gear 17 are meshed and arranged, so that the temperature guiding frame 15 can rotate and dissipate heat inside the first device case 3, and the gas inside the first device case 3 can be uniformly cooled.

Specifically, the filter layer 29 is fixedly installed inside the third device box 5 on the left side of the gas pushing plate 28, liquid miscellaneous gas in methane is removed and filtered, the gas leakage grooves 30 are formed in the third device box 5 on the upper side and the lower side of the filter layer 29, when the gas pushing plate 28 moves to the gas leakage grooves 30, filtered methane gas flows to the right side of the gas pushing plate 28 through the gas leakage grooves 30, and purified methane gas on the right side flows out through the first vent pipe 6 to be collected.

Specifically, the second vent pipe 9 is fixedly installed on the rear side of the second device box 4, the second vent pipe 9 is in through connection with the gas transmission cavity of the second device box 4, the other end of the second vent pipe 9 is in through connection with the rear side of the fourth device box 7, so that air conditioning is conveyed to the fourth device box 7 from the gas transmission cavity of the second device box 4, the raw gas is subjected to cooling pretreatment, the left side of the fourth device box 7 is in through connection with the fifth vent pipe 25, the other end of the fifth vent pipe 25 is fixedly installed on the first device box 3, the other end of the fifth vent pipe 25 is in through connection with the first device box 3, and the air conditioning, which is subjected to cooling, is circulated to the first device box 3 from the fourth device box 7 to be cooled again.

Specifically, 1 front side upper end fixed mounting cooling generator 2 of cooler bin, liquid reserve tank 11 front side fixed connection discharging pipe 12, and discharging pipe 12 fixed mounting on cooler bin 1, cooling generator 2 provides the low temperature environment to the inside liquid reserve tank 11 of cooler bin 1, and liquid miscellaneous gas passes through discharging pipe 12 outflow collection in the liquid reserve tank 11 simultaneously.

The working principle is as follows: raw gas flows into the fourth device box 7 from the gas inlet pipe 8, flows into the liquid storage box 11 through the fourth device box 7, the cooling generator 2 is started, the raw gas in the liquid storage box 11 is cooled and condensed through the cooling generator 2, the condensed raw gas is separated, miscellaneous gas is condensed into liquid at low temperature and is collected at the bottom side in the liquid storage box 11, gaseous methane flows out from the fourth vent pipe 13 connected with the upper side of the liquid storage box 11, the low-temperature methane gas flows into the third vent pipe 10 of the first device box 3 through the fourth vent pipe 13, at the moment, the motor 19 is started, the motor 19 drives the first rotary drum 21 fixedly connected with the motor to rotate, the first rotary drum 21 rotates to drive the first rotary shaft 20 fixedly connected with the first rotary drum to rotate, the first rotary shaft 20 drives the rotary fan 36 fixedly connected with the first rotary drum 21 to rotate, and simultaneously drives the first rotary groove 22 arranged on the first rotary drum to rotate synchronously, the first rotary groove 22 rotates to drive the moving column 23 slidably mounted on the first rotary groove to horizontally move on the second device box 4, during the horizontal movement of the moving column 23, at this time, the moving column 23 drives the lower end of the moving column to horizontally move in the second rotary groove 33, so that the second rotary cylinder 32 rotates, the second rotary cylinder 32 rotates to drive the driving gear 17 to rotate through the second rotary shaft 34 fixedly connected with the second rotary cylinder, the driving gear 17 drives the rotary gear 16 engaged with the rotary gear to rotate, the rotary gear 16 drives the temperature guide frame 15 fixedly mounted with the rotary gear to circularly rotate outside the third vent pipe 10, so that the temperature of the low-temperature methane gas in the third vent pipe 10 is transmitted to the gas in the first device box 3, the temperature of the gas in the first device box 3 is reduced, low-temperature gas is formed, and the low-temperature gas enters the gas transmission cavity communicated with the first device box 3, the centrifugal force formed by the rotation of the rotating fan 36 drives the low-temperature gas in the gas transmission cavity to flow out through the second vent pipe 9, the low-temperature gas in the second vent pipe 9 flows into the fourth device box 7, so that the low-temperature gas performs cooling pretreatment on the raw gas in the gas inlet pipe 8 fixedly installed in the fourth device box 7, the threaded plate 14 is fixedly installed in the gas inlet pipe 8, the threaded plate 14 increases the cooling pretreatment time of the raw gas by prolonging the flow path of the raw gas, meanwhile, the moving column 23 translates left and right to move the other end of the moving column 23 in the sliding groove 31 of the rotating rod 24, the rotating rod 24 drives the rotating rod 24 to rotate in the moving process in the sliding groove 31, the rotating rod 24 rotates to drive the rotating wheel 35 fixedly connected with the rotating rod to perform non-circle center rotation, so that the rotating wheel 35 drives the connecting rod 27 to move left and right through the wheel sleeve 26, and the connecting rod 27 drives the gas pushing plate 28 connected with the connecting rod to perform left and right translation in the third device box 5, the methane gas after low temperature condensation flows into the third device box 5 through the third vent pipe 10, and liquid impurity gas filtration is performed through the filter layer 29, meanwhile, in the process of horizontal translation of the connecting rod 27, the connecting rod 27 repeatedly extrudes the gas in the third device box 5 on the left side of the connecting rod 27, so that the methane gas repeatedly passes through the filter layer 29, further the methane gas is repeatedly filtered in the filter layer 29, the liquid impurity gas in the methane gas is further removed, the gas purity of the methane is improved, secondly, when the gas pushing plate 28 moves to the position of the gas leakage groove 30, the filtered methane gas flows to the right side of the gas pushing plate 28 through the gas leakage groove 30, then the purified methane gas on the right side flows out through the first vent pipe 6 for collection, in addition, the gas after temperature reduction pretreatment is performed on the raw gas in the gas inlet pipe 8 in the fourth device box 7 flows into the first device box 3 through the fifth vent pipe 25, make the gas after the use carry out cryogenic treatment once more in first device case 3 is inside, be convenient for carry out next raw gas low temperature preliminary treatment, liquid miscellaneous gas flows out through discharging pipe 12 and collects.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the embodiments and descriptions given above are only illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A methane purification device is characterized in that: comprises a cooling box (1) and a cooling generator (2), wherein a liquid storage box (11) is fixedly arranged in the cooling box (1), a fourth device box (7) is fixedly arranged at the upper end of the left side of the cooling box (1), an air inlet pipe (8) is fixedly arranged in the fourth device box (7), the other end of the air inlet pipe (8) is fixedly connected with the liquid storage box (11), a fourth air outlet pipe (13) is fixedly connected with the upper end of the right side of the liquid storage box (11), a first device box (3) is fixedly arranged at the lower end of the left side of the cooling box (1), a third air outlet pipe (10) is fixedly arranged in the first device box (3), the other end of the fourth air outlet pipe (13) is fixedly connected with the third air outlet pipe (10), a second device box (4) is fixedly arranged at the upper side of the first device box (3), an air conveying cavity is fixedly arranged at the right side in the second device box (4), and is communicated with the first device box (3), a rotating fan (36) is arranged in the air transmission cavity, the position of the center of the circle on the left side of the rotating fan (36) is fixedly connected with a first rotating shaft (20), a fixed frame (18) is fixedly arranged in a second device box (4) on the left side of the air transmission cavity, a first rotating cylinder (21) is rotatably arranged in the fixed frame (18), a first rotating groove (22) is arranged on the first rotating cylinder (21), a second rotating cylinder (32) is rotatably arranged in the first rotating cylinder (21), a second rotating groove (33) is arranged on the second rotating cylinder (32), a motor (19) is fixedly connected with the left end of the first rotating cylinder (21), a moving column (23) is movably arranged in the first rotating groove (22), the lower end of the moving column (23) is movably arranged in the second rotating groove (33), a third device box (5) is fixedly arranged on a cooling box (1) at the upper end of the second device box (4), and the other end of the third air pipe (10) is fixedly connected with the left side of the third device box (5), the front side of the third device box (5) is connected with the first vent pipe (6) in a penetrating mode, a rotating wheel (35) is arranged inside the third device box (5), the non-circle center position of the lower side of the rotating wheel (35) is fixedly connected with a rotating rod (24), the other end of the rotating rod (24) is provided with a sliding groove (31), the upper end of the moving column (23) is movably installed inside the sliding groove (31), a wheel sleeve (26) is slidably installed on the outer side of the rotating wheel (35), the left side of the wheel sleeve (26) is rotatably connected with a connecting rod (27), the other end of the connecting rod (27) is rotatably connected with an air pushing plate (28), and the air pushing plate (28) is movably and hermetically installed inside the third device box (5).

2. A methane purification apparatus according to claim 1, wherein: the air inlet pipe (8) comprises a threaded plate (14), and the threaded plate (14) is fixedly installed inside the air inlet pipe (8).

3. A methane purification apparatus according to claim 2, wherein: the inside third breather pipe (10) outside of first device case (3) is rotated the installation and is led temperature frame (15), and lead temperature frame (15) right-hand member fixed mounting swing gear (16) outside third breather pipe (10), second rotary drum (32) right side centre of a circle position fixed mounting second rotation axis (34), and second rotation axis (34) slidable mounting is inside first rotation axis (20) and rotatory fan (36), second rotation axis (34) other end fixed connection driving gear (17), and swing gear (16) and driving gear (17) meshing installation.

4. A methane purification apparatus according to claim 3, wherein: a filter layer (29) is fixedly arranged in the third device box (5) on the left side of the air pushing plate (28), and air leakage grooves (30) are formed in the third device box (5) on the upper side and the lower side of the filter layer (29).

5. A methane purification apparatus according to claim 4, characterized in that: second device case (4) rear side fixed mounting second breather pipe (9), and second breather pipe (9) and gas transmission chamber through connection, second breather pipe (9) other end through connection and fourth device case (7) rear side, fourth device case (7) front side through connection fifth breather pipe (25), and fifth breather pipe (25) other end fixed mounting is on first device case (3), and the fifth breather pipe (25) other end and first device case (3) through connection.

6. A methane purification apparatus according to claim 5, characterized in that: cooling generator (2) is fixedly installed at the upper end of the front side of cooling box (1), discharging pipe (12) is fixedly connected to the front side of liquid storage box (11), and discharging pipe (12) is fixedly installed on cooling box (1).