Liquefied natural gas extraction device with low-temperature compression function

Abstract

The utility model relates to the field of liquefied natural gas extraction, in particular to a liquefied natural gas extraction device with a low-temperature compression function. The liquefied natural gas extraction device with the low-temperature compression function can detect the air pressure in the buffer pipe, prevent compressed gas from reversely flowing back, reduce the power consumption of the gas compressor and prolong the service life of the gas compressor. A liquefied natural gas extraction device with a low-temperature compression function comprises a gas inlet, a gas pump and the like, the left side of the lower portion of the gas pump is connected with the gas inlet, and a gas compressor is placed on the right side of a gas conveying pipe. When the air pressure in the air pump is detected to be abnormal, the risk that backflow possibly occurs is judged, an alarm can be given through the air detector, an operator is notified to rotate the adjusting valve to be closed, and the air pump is rapidly disconnected, so that the air pressure in the buffer pipe can be detected, compressed air is prevented from reversely flowing back, and the service life of the air pump is prolonged. And the service life of the gas compressor is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of liquefied natural gas extraction, in particular to a liquefied natural gas extraction device with a low-temperature compression function. Background Art

[0002] Liquefied natural gas (LNG) is a high-pressure, low-temperature, flammable and explosive gas. Its main component is methane, which may contain small amounts of ethane, propane, nitrogen or other components commonly found in natural gas. During transportation and storage, LNG is cooled to extremely low temperatures and converted into liquid form, which greatly reduces its volume and improves storage efficiency.

[0003] The existing liquefied natural gas extraction process is to extract gaseous natural gas into the air compressor for compression, and then convert the natural gas into liquid through condensation. However, when the air compressor is working, due to operational errors or leaks in the gas pipeline, the pressure in the slow-transmission pipeline is too low, causing the air compressor to experience backflow, that is, the compressed gas flows back to the compressor inlet or low-pressure area. This will not only reduce the working efficiency of the compressor and increase energy consumption, but may also cause serious mechanical damage to the compressor and its ancillary equipment, which is relatively inconvenient.

[0004] Therefore, a liquefied natural gas extraction device with a low-temperature compression function has been developed, which can detect the gas pressure in the buffer pipe, prevent the compressed gas from flowing back, reduce the power consumption of the gas compressor and increase its service life. Utility Model Content

[0005] In order to overcome the shortcomings that when the air compressor is working, due to operational errors or leakage in the gas pipeline, the pressure in the buffer gas pipeline is too low, causing backflow in the air compressor, increasing energy consumption, and possibly causing serious mechanical damage to the compressor and its ancillary equipment, the utility model provides a liquefied natural gas extraction device with low-temperature compression function, which can detect the air pressure in the buffer pipe, prevent the compressed gas from flowing back, reduce the power consumption of the gas compressor and extend its service life.

[0006] The technical implementation scheme of the present utility model is: a liquefied natural gas extraction device with a low-temperature compression function, including an air inlet, a gas pipeline, an air pump, an air intake control valve, a buffer pipe, a gas compressor, a control component and a condensation component. The air pump is connected to the air inlet on the left side of the lower part, and the gas compressor is placed on the right side of the gas pipeline. The buffer pipe is connected to the left side of the gas compressor, and the gas pipeline is connected between the buffer pipe and the air pump. The gas pipeline is rotatably connected to the air intake control valve, and the buffer pipe is provided with a control component capable of gas transmission control. A condensation component capable of condensing compressed gas is provided on the right side of the gas compressor.

[0007] Preferably, a handle is provided on the air intake control valve.

[0008] Preferably, the control assembly includes a regulating valve and a gas detector. The upper and lower parts of the buffer tube are both connected to the gas detector, and the regulating valve is rotatably connected to the buffer tube.

[0009] Preferably, a swivel is provided on the regulating valve.

[0010] Preferably, the regulating valve is made of stainless steel.

[0011] Preferably, the condensation component includes a condensation tank and an output pipe. The right side of the gas compressor is connected to the condensation tank, and the right side of the condensation tank is connected to the output pipe.

[0012] The beneficial effects of the present invention are as follows: when the air pressure in the air pump is detected to be abnormal, the present invention determines that there may be a risk of backflow, and can sound an alarm through the gas detector to notify the operator to turn the regulating valve to close and quickly disconnect the air pump, thereby achieving the effect of being able to detect the air pressure in the buffer tube, preventing the compressed gas from flowing back in reverse, reducing the power consumption of the gas compressor and increasing its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the first three-dimensional structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the second three-dimensional structure of the present invention.

[0015] Explanation of the accompanying drawings: 1_air inlet, 2_gas pipe, 3_air pump, 4_air inlet control valve, 5_buffer pipe, 6_regulating valve, 7_gas detector, 8_gas compressor, 9_condensation tank, 10_output pipe. DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] A liquefied natural gas extraction device with low temperature compression function, such as Figure 1 and Figure 2 As shown, it includes an air inlet 1, an air supply pipe 2, an air pump 3, an air intake control valve 4, a buffer pipe 5, a gas compressor 8, a control component and a condensation component. The air pump 3 is connected to the air inlet 1 on the lower left side, and the gas compressor 8 is placed on the right side of the air supply pipe 2. The buffer pipe 5 is connected to the left side of the gas compressor 8, and the air supply pipe 2 is connected between the buffer pipe 5 and the air pump 3. The air supply pipe 2 is rotatably connected to the air intake control valve 4, and the air intake control valve 4 is provided with a handle for easy grasping. The buffer pipe 5 is provided with a control component, and a condensation component is provided on the right side of the gas compressor 8.

[0018] like Figure 1 and Figure 2As shown, the control component includes a regulating valve 6 and a gas detector 7. The upper and lower parts of the buffer tube 5 are connected to the gas detector 7. The buffer tube 5 is rotatably connected to the regulating valve 6. The regulating valve 6 is provided with a swivel for easy rotation. The regulating valve 6 is made of stainless steel.

[0019] like Figure 1 and Figure 2 As shown, the condensation component includes a condensation tank 9 and an output pipe 10. The right side of the gas compressor 8 is connected to the condensation tank 9, and the right side of the condensation tank 9 is connected to the output pipe 10.

[0020] When using the present invention, the device is first placed at the extraction position of liquefied natural gas, and then connected to the natural gas transmission pipeline through the air inlet 1. Then, the air inlet control valve 4 is turned to open, and the air pump 3 is started to extract natural gas from the air inlet 1 into the air pump 3. After being buffered by the buffer pipe 5, it flows into the gas compressor 8. At the same time, the gas compressor 8 is started again, so that the gas compressor 8 liquefies the natural gas. The natural gas compressed by the gas compressor 8 flows into the condenser 9 for condensation. Finally, the condensed liquefied natural gas is discharged from the output pipe 10 for collection. During the natural gas transmission process, the gas detector 7 on the buffer pipe 5 can detect the air pressure in the air pump 3. When the air pressure in the air pump 3 is detected to be abnormal, it is determined that there may be a risk of backflow. The gas detector 7 can alarm and notify the operator to turn the regulating valve 6 to close, quickly disconnect the air pump 3, and avoid the backflow of the compressed gas in the gas compressor 8. This plays the role of detecting the air pressure in the buffer pipe 5, preventing the compressed gas from flowing back, reducing the power consumption of the gas compressor 8 and extending the service life of the device.

[0021] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A liquefied natural gas extraction device with a cryogenic compression function, characterized by: The invention comprises an air inlet (1), an air delivery pipe (2), an air pump (3), an air intake control valve (4), a buffer pipe (5), a gas compressor (8), a control component and a condensation component. The air pump (3) is connected to the air inlet (1) on the left side of the lower part, the gas compressor (8) is placed on the right side of the air delivery pipe (2), the buffer pipe (5) is connected to the left side of the gas compressor (8), the air delivery pipe (2) is connected between the buffer pipe (5) and the air pump (3), the air intake control valve (4) is rotatably connected to the air delivery pipe (2), the buffer pipe (5) is provided with a control component capable of controlling air delivery, and the right side of the gas compressor (8) is provided with a condensation component capable of condensing compressed gas.

2. A liquefied natural gas extraction device with cryogenic compression function according to claim 1, characterized in that: The air intake control valve (4) is provided with a handle.

3. The liquefied natural gas extraction device with cryogenic compression function according to claim 1, characterized in that: The control component comprises a regulating valve (6) and a gas detector (7). The upper and lower parts of the buffer tube (5) are both connected to the gas detector (7), and the regulating valve (6) is rotatably connected to the buffer tube (5).

4. The liquefied natural gas extraction device with cryogenic compression function according to claim 3, characterized in that: The regulating valve (6) is provided with a swivel.

5. The liquefied natural gas extraction device with cryogenic compression function according to claim 3, characterized in that: The regulating valve (6) is made of stainless steel.

6. The liquefied natural gas extraction device with cryogenic compression function according to claim 3, characterized in that: The condensation component comprises a condensation tank (9) and an output pipe (10). The right side of the gas compressor (8) is connected to the condensation tank (9), and the right side of the condensation tank (9) is connected to the output pipe (10).

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