Reutilization and matched manual sampling system for desorbed gas in natural gas purification device

Abstract

The utility model relates to the technical field of natural gas, in particular to a desorbed gas recycling and matched manual sampling system in a natural gas purification device. Comprising a raw material natural gas pipe, wherein the raw material natural gas pipe is connected with the bottom of an adsorption tower; the top of the adsorption tower is connected with a purified natural gas pipe; the bottom of the adsorption tower is connected with a desorbed gas water cooler through a vacuum pump; a cooler outlet is connected with a fuel gas pipe through a desorption gas pipe III; the raw natural gas pipe is connected with a raw gas sampling pipe which is connected with an inlet of a raw gas sampling steel cylinder; the desorption gas pipe I is connected with a desorption gas sampling pipe; the desorption gas sampling pipe is connected with an inlet of a desorption gas sampling steel cylinder; the purified natural gas pipe is connected with an inlet of the purified gas sampling steel cylinder. The desorbed gas is merged into the fuel gas pipe network, so that energy is saved; the component change of upstream raw material natural gas, purified natural gas and desorbed natural gas can be conveniently monitored.

Description

TECHNICAL FIELD

[0001] The utility model relates to natural gas technical field, concretely relates to desorption gas recycling and matching manual sampling system in natural gas purification device. BACKGROUND

[0002] Natural gas as fuel gas, plays a vital role to heating furnace combustion, heat conduction oil furnace combustion, waste gas (waste liquid) incinerator combustion, etc. Fuel gas in pipe network comes from 1.0MPa pipe network natural gas, and under the action of pressure control regulating valve, the fuel gas pipe network pressure is controlled at 0.5MPa for downstream device use. Generally, the purity (namely methane content) of natural gas is above 90%, when used in device and process with high methane purity requirement, it needs to be purified by adsorption tower and then used, the adsorbent in adsorption tower adsorbs C2 and above components (namely C2+) in natural gas, and the adsorbed gas in adsorption tower is desorbed by vacuum pump after completing multiple pressure equalization and pressure reduction under the action of program control valve, and the C2+ desorption gas is mainly ethane, propane, butane and pentane in natural gas, and its heat value is much higher than that of pipe network natural gas, which is directly discharged into flare pipe network without utilization, causing energy waste. SUMMARY

[0003] The utility model solves the technical problem, and proposes a desorption gas recycling and matching manual sampling system in natural gas purification device, which integrates the desorption gas into fuel gas pipe network, saves energy, and is convenient for monitoring the component change of upstream raw material natural gas, purified natural gas and desorbed natural gas.

[0004] The desorption gas recycling and matching manual sampling system in natural gas purification device, comprising a raw material natural gas pipe, a raw material natural gas pipe connected to the bottom of an adsorption tower, an adsorption tower top connected to a purified natural gas pipe, an adsorption tower bottom connected to a desorption gas water cooler through a vacuum pump, a desorption gas water cooler connected to a screw compressor inlet through a desorption gas pipe one, a screw compressor outlet connected to a cooler inlet through a desorption gas pipe two, a cooler outlet connected to a fuel gas pipe through a desorption gas pipe three; a raw material natural gas pipe connected to a raw material gas sampling pipe, a raw material gas sampling pipe connected to a raw material gas sampling steel bottle inlet, a raw material gas sampling steel bottle outlet connected to a venting main pipe; a desorption gas pipe one connected to a desorption gas sampling pipe, a desorption gas sampling pipe connected to a desorption gas sampling steel bottle inlet, a desorption gas sampling steel bottle outlet connected to a venting main pipe; a purified natural gas pipe connected to a purified gas sampling steel bottle inlet through a purified gas sampling pipe, a purified gas sampling steel bottle outlet connected to a venting main pipe, and a venting main valve arranged on the venting main pipe; the venting main pipe, the purified natural gas pipe and the desorption gas pipe one are respectively connected to a flare pipe network.

[0005] Preferably, the adsorption tower is provided with multiple adsorption towers, and the multiple adsorption towers are connected in parallel, and a program control valve is arranged on the top of the adsorption tower.

[0006] Preferably, the raw material gas pipe is connected to the adsorption tower through a raw material gas buffer tank; and the desorption gas pipe is connected to a screw compressor inlet and a flare pipe network through a desorption gas buffer tank, respectively.

[0007] Preferably, the raw material gas sampling steel cylinder is connected in parallel with a raw material gas sampler bypass vent pipe, the raw material gas pipe is connected to the raw material gas sampler bypass vent pipe and the raw material gas sampling steel cylinder inlet through a three-way valve, and the raw material gas sampling steel cylinder outlet and the raw material gas sampler bypass vent pipe are connected to a vent main pipe through a raw material gas sampler outlet branch pipe.

[0008] The desorption gas sampling steel cylinder is connected in parallel with a desorption gas sampler bypass vent pipe, the desorption gas pipe is connected to the desorption gas sampler bypass vent pipe and the desorption gas sampling steel cylinder inlet through a three-way valve two, and the desorption gas sampling steel cylinder outlet and the desorption gas sampler bypass vent pipe are connected to a vent main pipe through a desorption gas sampler outlet branch pipe.

[0009] The purified gas sampling steel cylinder is connected in parallel with a purified gas sampler bypass vent pipe, the purified gas pipe is connected to the purified gas sampler bypass vent pipe and the purified gas sampling steel cylinder inlet through a three-way valve three, and the purified gas sampling steel cylinder outlet and the purified gas sampler bypass vent pipe are connected to a vent main pipe through a purified gas sampler outlet branch pipe.

[0010] The raw material gas sampling steel cylinder, the desorption gas sampling steel cylinder and the purified gas sampling steel cylinder are respectively provided with a sampling pressure gauge and a sampling steel cylinder inlet valve, and the raw material gas sampling steel cylinder, the desorption gas sampling steel cylinder and the purified gas sampling steel cylinder are respectively provided with a sampling steel cylinder outlet valve.

[0011] Preferably, the raw material gas sampler outlet branch pipe, the desorption gas sampler outlet branch pipe and the purified gas sampler outlet branch pipe are respectively provided with a sampler outlet check valve.

[0012] Preferably, the screw compressor is connected to a main motor output shaft through a shaft coupling, the input shaft of the main motor is connected to a gear box through a clutch, the gear box is connected to an expander output shaft, the expander gas inlet is connected to a high-pressure natural gas pipe, and the expander gas outlet is connected to the raw material natural gas pipe through a gas outlet check valve.

[0013] Preferably, a natural gas heater is arranged between the high-pressure natural gas pipe and the expander gas inlet.

[0014] Preferably, the raw material natural gas pipe is connected to a fuel gas pipe through a natural gas supplement pipe, the natural gas supplement pipe is provided with a pressure control regulating valve, the fuel gas pipe is provided with a fuel gas pipe network pressure gauge, and the fuel gas pipe network pressure gauge is electrically connected to the pressure control regulating valve.

[0015] Preferably, a compressor inlet pressure supplement line is arranged between the cooler outlet and the screw compressor inlet; and a desorption gas pressure gauge and a desorption gas check valve are arranged between the desorption gas pipe three and the fuel gas pipe.

[0016] Preferably, a pressure regulating pipe is connected between the desorption gas pressure gauge and the desorption gas one-way valve, the pressure regulating pipe is connected with a flare pipe network, a pressure regulating valve is arranged on the pressure regulating pipe, and the pressure regulating valve and the desorption gas pressure gauge are electrically connected.

[0017] After the natural gas is purified by the adsorption tower, the purified gas enters a downstream gas device through a purified natural gas pipe, and the methane and C2+ (ethane, propane, butane, pentane, etc.) components adsorbed by the adsorbent in the adsorption tower are finally desorbed from the adsorbent after the system is pressure equalized by the program control valve and the vacuum pump. The whole process is: adsorption - pressure drop - desorption (adsorbent regeneration) - pressure rise - adsorption, and the cycle operation is carried out. Compared with the prior art, the natural gas purification device has the beneficial effects that:

[0018] 1. After the 1.0MPa natural gas in the raw material natural gas pipe absorbs the C2+ components through the adsorption tower, the purified natural gas flowing out from the top of the adsorption tower enters the purified natural gas pipe as high-purity methane for utilization; after the pressure drop of the adsorption tower is completed, the adsorbent is regenerated by vacuumizing the adsorption tower by the vacuum pump, the adsorbent regeneration generates desorption gas, the desorption gas is cooled by a desorption gas water cooler and then enters a screw compressor and is pressurized to 0.5MPa, and then enters a cooler for cooling, and then enters a fuel gas pipe as fuel for utilization;

[0019] 2. The desorption gas generated by purifying the raw material natural gas is recycled and added into the fuel gas pipe network, which not only supplements the fuel gas amount, but also increases the calorific value of the fuel gas, and is beneficial to energy saving;

[0020] 3. The raw material gas sampling steel cylinder, the desorption gas sampling steel cylinder and the purified gas sampling steel cylinder can monitor the components of the raw material natural gas, the desorption gas and the purified natural gas in real time without affecting the production. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the natural gas purification device;

[0022] In the figure: 1. Raw natural gas pipe; 2. Adsorption tower; 3. Purified natural gas pipe; 4. Vacuum pump; 5. Desorption gas water cooler; 6. Desorption gas pipe 1; 7. Screw compressor; 8. Desorption gas pipe 2; 9. Cooler; 10. Desorption gas pipe 3; 11. Fuel gas pipe; 12. Raw gas sampling pipe; 13. Raw gas sampling cylinder; 14. Vent main pipe; 15. Desorption gas sampling pipe; 16. Desorption gas sampling cylinder; 17. Purified gas sampling cylinder; 18. Flare pipe network; 19. Raw gas buffer tank; 20. Desorption gas buffer tank; 21. Raw gas sampler bypass vent pipe; 22. Three-way valve 1; 23. Raw gas sampler outlet branch pipe; 24. Desorption gas sampler bypass vent pipe Empty pipe; 25. Desorbed gas sampler outlet branch pipe; 26. Purified gas sampler bypass vent pipe; 27. Purified gas sampler outlet branch pipe; 28. Three-way valve 2; 29. ​​Three-way valve 3; 30. Purified gas sampling pipe; 31. Vent main valve; 32. Coupling; 33. Main motor; 34. Clutch; 35. Gearbox; 36. Expander; 37. High-pressure natural gas pipe; 38. Gas outlet check valve; 39. Natural gas heater; 40. Natural gas supply pipe; 41. Pressure-controlled regulating valve; 42. Compressor inlet pressure supply line; 43. Desorbed gas pressure gauge; 44. Desorbed gas check valve; 45. Pressure regulating pipe; 46. Pressure regulating valve; 47. Large span line; 48. Fuel gas network pressure gauge. DETAILED DESCRIPTION

[0023] The present invention will be described clearly and completely below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, the desorbed gas reuse and supporting manual sampling system in the natural gas purification device include a raw natural gas pipe 1, the raw natural gas pipe 1 is connected to the bottom of the adsorption tower 2, the top of the adsorption tower 2 is connected to the purified natural gas pipe 3, the bottom of the adsorption tower 2 is connected to the desorbed gas water cooler 5 through a vacuum pump 4, the desorbed gas water cooler 5 is connected to the inlet of the screw compressor 7 through the desorbed gas pipe 1 6, the outlet of the screw compressor 7 is connected to the inlet of the cooler 9 through the desorbed gas pipe 2 8, and the outlet of the cooler 9 is connected to the fuel gas pipe 11 through the desorbed gas pipe 3 10; the raw natural gas pipe 1 is connected to the raw gas sampling pipe 12, the raw gas sampling pipe 12 is connected to the inlet of the raw gas sampling cylinder 13, and the outlet of the raw gas sampling cylinder 13 is connected to the vent main pipe 14; the desorption gas pipe 6 is connected to the desorption gas sampling pipe 15, the desorption gas sampling pipe 15 is connected to the inlet of the desorption gas sampling cylinder 16, and the outlet of the desorption gas sampling cylinder 16 is connected to the vent main pipe 14; the purified natural gas pipe 3 is connected to the inlet of the purified gas sampling cylinder 17 through the purified gas sampling pipe 30, and the outlet of the purified gas sampling cylinder 17 is connected to the vent main pipe 14, and the vent main pipe 14 is provided with a vent main valve 31; the vent main pipe 14, the purified natural gas pipe 3, and the desorption gas pipe 6 are respectively connected to the flare pipe network 18.

[0025] The adsorption tower 2 is provided with a plurality of adsorption towers 2, the plurality of adsorption towers 2 are connected in parallel, and the adsorption tower 2 is provided with a program-controlled valve at the top.

[0026] The raw material natural gas pipe 1 is connected with the adsorption tower 2 through a raw material gas buffer tank 19; the desorption gas pipe one 6 is connected with the screw compressor 7 inlet and the flare pipe network 18 respectively through a desorption gas buffer tank 20.

[0027] The raw material gas sampling steel cylinder 13 is connected with a raw material gas sampler bypass vent pipe 21 in parallel, the raw material natural gas pipe 1 is connected with the raw material gas sampler bypass vent pipe 21 and the raw material gas sampling steel cylinder 13 inlet through a three-way valve one 22, and the raw material gas sampling steel cylinder 13 outlet and the raw material gas sampler bypass vent pipe 21 are connected with the venting main pipe 14 through a raw material gas sampler outlet branch pipe 23;

[0028] The desorption gas sampling steel cylinder 16 is connected with a desorption gas sampler bypass vent pipe 24 in parallel, the desorption gas pipe one 6 is connected with the desorption gas sampler bypass vent pipe 24 and the desorption gas sampling steel cylinder 16 inlet through a three-way valve two 28, and the desorption gas sampling steel cylinder 16 outlet and the desorption gas sampler bypass vent pipe 24 are connected with the venting main pipe 14 through a desorption gas sampler outlet branch pipe 25;

[0029] The purified gas sampling steel cylinder 17 is connected with a purified gas sampler bypass vent pipe 26 in parallel, the purified natural gas pipe 3 is connected with the purified gas sampler bypass vent pipe 26 and the purified gas sampling steel cylinder 17 inlet through a three-way valve three 29, and the purified gas sampling steel cylinder 17 outlet and the purified gas sampler bypass vent pipe 26 are connected with the venting main pipe 14 through a purified gas sampler outlet branch pipe 27; the inlet pipe of the sampling steel cylinder and the replacement of the gas in the sampling steel cylinder are directly discharged, so that the safety hidden danger and the environmental protection risk possibly caused during sampling are prevented.

[0030] The raw material gas sampling steel cylinder 13, the desorption gas sampling steel cylinder 16 and the purified gas sampling steel cylinder 17 inlet are respectively provided with a sampling pressure gauge and a sampling steel cylinder inlet valve, and the raw material gas sampling steel cylinder 13, the desorption gas sampling steel cylinder 16 and the purified gas sampling steel cylinder 17 outlet are respectively provided with a sampling steel cylinder outlet valve. The sampling pressure gauge is used for pressure monitoring during sampling, if the pressure display of the sampling pressure gauge is consistent with the pipe network pressure, it is indicated that the sampling steel cylinder is full. The sampling steel cylinder inlet valve and the sampling steel cylinder outlet valve are convenient for continuously replacing the gas in the sampling steel cylinder, so that the purity of the sampling gas is ensured.

[0031] The raw material gas sampler outlet branch pipe 23, the desorption gas sampler outlet branch pipe 25 and the purified gas sampler outlet branch pipe 27 are respectively provided with a sampler outlet check valve, so that the gas back stringing is effectively prevented.

[0032] Screw compressor 7 is connected with main motor 33 output shaft through coupling 32, main motor 33 input shaft is connected with gear box 35 through clutch 34, gear box 35 is connected with expander 36 output shaft, expander 36 gas inlet is connected with high pressure natural gas pipe 37, expander 36 gas outlet is connected with raw material natural gas pipe 1 through gas one-way valve 38.

[0033] High pressure natural gas pipe 37 and expander 36 gas inlet are provided with natural gas heater 39.

[0034] Raw material natural gas pipe 1 is connected with fuel gas pipe 11 through natural gas supplement pipe 40, pressure control regulating valve 41 is arranged on natural gas supplement pipe 40, fuel gas pipe network pressure gauge 48 is arranged on fuel gas pipe 11, fuel gas pipe network pressure gauge 48 is electrically connected with pressure control regulating valve 41.

[0035] Compressor inlet pressure supplement line 42 is arranged between cooler 9 outlet and screw compressor 7 inlet; desorption gas pressure gauge 43 and desorption gas one-way valve 44 are arranged between desorption gas pipe three 10 and fuel gas pipe 11. Compressor inlet pressure supplement line 42 is used for balancing screw compressor 7 inlet pressure, preventing desorption gas buffer tank 20 from being extracted into negative pressure, thereby causing safety accident.

[0036] Pressure regulating pipe 45 is connected between desorption gas pressure gauge 43 and desorption gas one-way valve 44, pressure regulating pipe 45 is connected with flare pipe network 18, pressure regulating valve 46 is arranged on pressure regulating pipe 45, pressure regulating valve 46 and desorption gas pressure gauge 43 are electrically connected.

[0037] Raw material natural gas pipe 1 and purified natural gas pipe 3 are connected through large span line 47. When the device fails, purified natural gas pipe 3 cannot temporarily maintain pressure, in order to prevent downstream device from stopping due to purified gas supply interruption, in emergency situation, raw material gas can be selected to supplement purified gas, purified natural gas pipe 3 pressure is temporarily maintained through raw material gas, after the fault is eliminated, large span line 47 valve is closed.

[0038] Working process is as follows:

[0039] 1.0MPa natural gas enters raw material gas buffer tank 19 after buffering, enters adsorption tower 2, C2+ component in raw material natural gas is absorbed, purified natural gas flows out from adsorption tower 2 top, enters purified natural gas pipe 3, and is sent to downstream gas device through external sending regulating valve.

[0040] The methane and C2+ components adsorbed by the adsorbent in the adsorption tower 2 are subjected to pressure equalization of the adsorption tower 2 and regeneration of the adsorbent by the program-controlled valve and the vacuum pump 4. After the adsorption of the adsorption tower 2 is completed, the gas in the tower is subjected to reverse stepwise pressure reduction from top to bottom under the action of the vacuum pump 4, so as to realize desorption of the adsorbent. The desorption gas after desorption is cooled by the desorption gas water cooler 5 and then enters the desorption gas buffer tank 20. The desorption gas in the desorption gas buffer tank 20 enters the screw compressor 7 through the desorption gas pipe one 6 and is pressurized to 0.5 MPa. Then, the desorption gas after pressurization enters the cooler 9 through the desorption gas pipe two 8 from the outlet of the screw compressor 7 for cooling. The desorption gas after cooling enters the fuel gas pipe 11 through the desorption gas pipe three 10 and the desorption gas one-way valve 44 for use as fuel.

[0041] When the gas demand of the fuel gas pipe 11 is greater than the desorption gas amount provided by the screw compressor 7, the pressure of the fuel gas pipe 11 decreases, and the natural gas supplement pipe 40 supplements the pressure of the fuel gas pipe 11 through the pressure-controlled regulating valve 41, so as to maintain the pressure of the fuel gas pipe 11.

[0042] In addition, the 3.5 MPa natural gas in the high-pressure natural gas pipe 37 is heated by the natural gas heater 39 and then enters the expander 36. Under the high-speed operation of the expander 36, the gear box 35 is driven to rotate. When the expander 36 reaches the rated speed, the gear box 35 is connected with the clutch 34 and drives the main motor 33 to operate, so as to drive the screw compressor 7 to operate at high speed. The electric energy required by the main motor 33 can be partially or completely replaced, so as to realize the effect of saving electricity. The natural gas with a pressure reduced to 1.0 MPa obtained from the outlet of the expander 36 can also enter the raw material gas pipe 1 through the outlet one-way valve 38 and be collected with the 1.0 MPa natural gas, and then enter the raw material gas buffer tank 19.

[0043] The raw material gas pipe 1 is directly connected with the raw material gas sampling pipe 12. Before the 1.0 MPa natural gas enters the raw material gas buffer tank 19, the raw material gas is guided into the raw material gas sampling steel cylinder 13. The purified natural gas pipe 3 is connected with the purified gas sampling steel cylinder 17, and the purified natural gas is guided into the purified gas sampling steel cylinder 17. The desorption gas pipe one 6 is connected with the desorption gas sampling pipe 15. Specifically, the desorption gas sampling pipe 15 is connected to the pipeline from the outlet of the desorption gas buffer tank 20 to the inlet of the screw compressor 7, and the desorption gas from the desorption gas buffer tank 20 can be guided into the desorption gas sampling steel cylinder 16. The outlets of the raw material gas sampling steel cylinder 13, the desorption gas sampling steel cylinder 16 and the purified gas sampling steel cylinder 17 are respectively connected with the raw material gas sampler outlet branch pipe 23, the desorption gas sampler outlet branch pipe 25 and the purified gas sampler outlet branch pipe 27 through quick couplings and metal hoses. The soft connection is more flexible to install.

[0044] Raw material natural gas sampling: First, confirm the raw material gas sampling pipe 12, raw material gas sampler outlet branch pipe 23 and the valve on the raw material gas sampling cylinder 13 are closed, install the raw material gas sampling cylinder 13 on the raw material gas sampling pipe 12, open the sampling cylinder inlet valve and the sampling cylinder outlet valve, turn the three-way valve one 22 to the circulation (sampling) position, open the valve on the raw material gas sampler outlet branch pipe 23, fill the raw material gas sampling cylinder 13 with fresh samples, then close the sampling cylinder inlet valve and the sampling cylinder outlet valve in turn, adjust the three-way valve one 22 to the vent position, make the gas pass through the raw material gas sampler bypass vent pipe 21, after the sampling pressure gauge stabilizes, turn the three-way valve one 22 to the closed position, close the valve on the raw material gas sampler outlet branch pipe 23, remove the raw material gas sampling cylinder 13, and complete the sampling.

[0045] Desorbed gas sampling: First, confirm the desorbed gas sampling pipe 15, desorbed gas sampler outlet branch pipe 25 and the valve on the desorbed gas sampling cylinder 16 are closed, install the desorbed gas sampling cylinder 16 on the desorbed gas sampling pipe 15, open the sampling cylinder inlet valve and the sampling cylinder outlet valve, turn the three-way valve two 28 to the circulation (sampling) position, open the valve on the desorbed gas sampler outlet branch pipe 25, fill the desorbed gas sampling cylinder 16 with fresh samples, then close the sampling cylinder inlet valve and the sampling cylinder outlet valve in turn, adjust the three-way valve two 28 to the vent position, make the gas pass through the desorbed gas sampler bypass vent pipe 24, after the sampling pressure gauge stabilizes, turn the three-way valve two 28 to the closed position, close the valve on the desorbed gas sampler outlet branch pipe 25, remove the desorbed gas sampling cylinder 16, and complete the sampling.

[0046] Purified natural gas sampling: First, confirm the purified gas sampling pipe 30, purified gas sampler outlet branch pipe 27 and the valve on the purified gas sampling cylinder 17 are closed, install the purified gas sampling cylinder 17 on the purified gas sampling pipe 30, open the sampling cylinder inlet valve and the sampling cylinder outlet valve, turn the three-way valve three 29 to the circulation (sampling) position, open the valve on the purified gas sampler outlet branch pipe 27, fill the purified gas sampling cylinder 17 with fresh samples, then close the sampling cylinder inlet valve and the sampling cylinder outlet valve in turn, adjust the three-way valve three 29 to the vent position, make the gas pass through the purified gas sampler bypass vent pipe 26, after the sampling pressure gauge stabilizes, turn the three-way valve three 29 to the closed position, close the valve on the purified gas sampler outlet branch pipe 27, remove the purified gas sampling cylinder 17, and complete the sampling.

Claims

1. A natural gas purification device desorption gas recycling and matching artificial sampling system, characterized in that, The raw material natural gas pipe (1) is connected with the bottom of the adsorption tower (2), the top of the adsorption tower (2) is connected with the purified natural gas pipe (3), the bottom of the adsorption tower (2) is connected with the desorption gas water cooler (5) through the vacuum pump (4), the desorption gas water cooler (5) is connected with the inlet of the screw compressor (7) through the desorption gas pipe I (6), the outlet of the screw compressor (7) is connected with the inlet of the cooler (9) through the desorption gas pipe II (8), the outlet of the cooler (9) is connected with the fuel gas pipe (11) through the desorption gas pipe III (10); the raw material natural gas pipe (1) is connected with the raw material gas sampling pipe (12), the raw material gas sampling pipe (12) is connected with the inlet of the raw material gas sampling steel bottle (13), the outlet of the raw material gas sampling steel bottle (13) is connected with the venting main pipe (14); the desorption gas pipe I (6) is connected with the desorption gas sampling pipe (15), the desorption gas sampling pipe (15) is connected with the inlet of the desorption gas sampling steel bottle (16), the outlet of the desorption gas sampling steel bottle (16) is connected with the venting main pipe (14); the purified natural gas pipe (3) is connected with the inlet of the purified gas sampling steel bottle (17) through the purified gas sampling pipe (30), the outlet of the purified gas sampling steel bottle (17) is connected with the venting main pipe (14), and the venting main pipe (14) is provided with a venting main valve (31); the venting main pipe (14), the purified natural gas pipe (3) and the desorption gas pipe I (6) are respectively connected with the flare pipe network (18).

2. The natural gas purification device desorbed gas recycling and matching artificial sampling system according to claim 1, characterized in that, The adsorption tower (2) is provided with a plurality of adsorption towers (2) which are arranged in parallel, and the top of the adsorption tower (2) is provided with a program-controlled valve.

3. The natural gas purification device, desorbed gas recycling and matching artificial sampling system according to claim 1, characterized in that, The raw material natural gas pipe (1) is connected with the adsorption tower (2) through the raw material gas buffer tank (19); the desorption gas pipe I (6) is respectively connected with the inlet of the screw compressor (7) and the flare pipe network (18) through the desorption gas buffer tank (20).

4. The natural gas purification device, desorbed gas recycling and matching manual sampling system according to claim 1, characterized in that, The raw material gas sampling steel bottle (13) is connected with the raw material gas sampler bypass venting pipe (21) in parallel, the raw material natural gas pipe (1) is connected with the inlet of the raw material gas sampling steel bottle (13) and the raw material gas sampler bypass venting pipe (21) through the three-way valve I (22), and the outlet of the raw material gas sampling steel bottle (13) and the raw material gas sampler bypass venting pipe (21) are connected with the venting main pipe (14) through the raw material gas sampler outlet branch pipe (23); The desorption gas sampling steel bottle (16) is connected with the desorption gas sampler bypass venting pipe (24) in parallel, the desorption gas pipe I (6) is connected with the inlet of the desorption gas sampling steel bottle (16) and the desorption gas sampler bypass venting pipe (24) through the three-way valve II (28), and the outlet of the desorption gas sampling steel bottle (16) and the desorption gas sampler bypass venting pipe (24) are connected with the venting main pipe (14) through the desorption gas sampler outlet branch pipe (25); The purified gas sampling steel bottle (17) is connected with the purified gas sampler bypass venting pipe (26) in parallel, the purified natural gas pipe (3) is connected with the inlet of the purified gas sampling steel bottle (17) and the purified gas sampler bypass venting pipe (26) through the three-way valve III (29), and the outlet of the purified gas sampling steel bottle (17) and the purified gas sampler bypass venting pipe (26) are connected with the venting main pipe (14) through the purified gas sampler outlet branch pipe (27). The inlet of the raw material gas sampling cylinder (13), the desorption gas sampling cylinder (16) and the purified gas sampling cylinder (17) is respectively provided with a sampling pressure gauge and a sampling cylinder inlet valve, and the outlet of the raw material gas sampling cylinder (13), the desorption gas sampling cylinder (16) and the purified gas sampling cylinder (17) is respectively provided with a sampling cylinder outlet valve.

5. The natural gas purification device, desorbed gas recycling and matching manual sampling system according to claim 4, characterized in that, The raw material gas sampler outlet branch pipe (23), the desorption gas sampler outlet branch pipe (25) and the purified gas sampler outlet branch pipe (27) are respectively provided with a sampler outlet check valve.

6. The natural gas purification unit, desorbed gas recycling and matching manual sampling system according to claim 1, characterized in that, The screw compressor (7) is connected with the output shaft of the main motor (33) through a coupling (32), the input shaft of the main motor (33) is connected with a gear box (35) through a clutch (34), the gear box (35) is connected with the output shaft of the expander (36), the gas inlet of the expander (36) is connected with the high-pressure natural gas pipe (37), and the gas outlet of the expander (36) is connected with the raw material natural gas pipe (1) through a gas outlet check valve (38).

7. The natural gas purification unit, desorbed gas recycling and matching manual sampling system according to claim 6, characterized in that, The high-pressure natural gas pipe (37) and the gas inlet of the expander (36) are provided with a natural gas heater (39).

8. The natural gas purification unit, desorbed gas recycling and matching manual sampling system according to claim 1, characterized in that, The raw material natural gas pipe (1) is connected with the fuel gas pipe (11) through a natural gas supplement pipe (40), the natural gas supplement pipe (40) is provided with a pressure control regulating valve (41), the fuel gas pipe (11) is provided with a fuel gas pipe network pressure gauge (48), and the fuel gas pipe network pressure gauge (48) is electrically connected with the pressure control regulating valve (41).

9. The natural gas purification unit, desorbed gas recycling and matching manual sampling system according to claim 8, characterized in that, The outlet of the cooler (9) and the inlet of the screw compressor (7) are provided with a compressor inlet pressure supplement line (42), and the desorption gas pipe three (10) and the fuel gas pipe (11) are provided with a desorption gas pressure gauge (43) and a desorption gas check valve (44).

10. The natural gas purification device, desorbed gas recycling and matching manual sampling system according to claim 9, characterized in that, The pipeline between the desorption gas pressure gauge (43) and the desorption gas check valve (44) is connected with a pressure regulating pipe (45), the pressure regulating pipe (45) is connected with the flare pipe network (18), the pressure regulating pipe (45) is provided with a pressure regulating valve (46), and the pressure regulating valve (46) and the desorption gas pressure gauge (43) are electrically connected.

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