A low-temperature rectification method and device for extracting helium from natural gas BOG

Abstract

The present invention discloses a low-temperature rectification device for extracting helium from natural gas BOG, which comprises a housing. It is characterized in that an air inlet is fixedly arranged on the side wall of the housing. One end of the air inlet located inside the housing is fixedly provided with a filter plate, and a sealing cover is covered on the air inlet. A cleaning mechanism corresponding to the filter plate is arranged inside the housing. A gas pressurizing mechanism is arranged inside the housing. A gas guide pipe is also fixedly arranged on the side wall of the housing. One end of the gas guide pipe far away from the housing is fixedly provided with a temperature controller, and an evaporation port is fixedly arranged on the temperature controller. A valve corresponding to the gas guide pipe is arranged on the gas guide pipe. The present invention can quickly complete the operations of filtering and purifying, pressurizing, cooling and liquefying, and then heating and evaporating the natural gas BOG, can quickly realize the low-temperature rectification operation of helium, and can continuously brush the filter plate during filtering, improve the air intake efficiency of the housing, and further improve the efficiency of low-temperature rectification of helium.

Description

Technical Field

[0001] The present invention relates to the technical field of helium extraction from natural gas BOG, and particularly to a low-temperature rectification method and device for extracting helium from natural gas BOG. Background Technique

[0002] Natural gas BOG refers to the gas generated by the heat conduction and natural evaporation of liquefied natural gas in the storage tank. The helium extraction method in natural gas BOG usually adopts the low-temperature rectification method. This method requires operations such as impurity purification, gas compression and pressurization, cooling and liquefaction, and heating and fractionation of the mixed gas. In the prior art, when purifying and filtering the mixed gas, dust impurities often accumulate and block the filter plate, affecting the flow rate of the gas, and thus affecting the efficiency of low-temperature rectification of helium. For this reason, we propose a low-temperature rectification method and device for extracting helium from natural gas BOG. Summary of the Invention

[0003] The purpose of the present invention is to solve the disadvantages existing in the prior art, such as: dust impurities often accumulate during the traditional purification of the mixed gas, affecting the filtering effect, and to propose a low-temperature rectification method and device for extracting helium from natural gas BOG.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A low-temperature rectification device for extracting helium from natural gas BOG includes a housing. A gas inlet is fixedly arranged on the side wall of the housing. One end of the gas inlet located inside the housing is fixedly provided with a filter plate. A sealing cover is covered on the gas inlet. A cleaning mechanism corresponding to the filter plate is arranged inside the housing. A gas pressurization mechanism is arranged inside the housing. A gas guide pipe is also fixedly arranged on the side wall of the housing. The end of the gas guide pipe far away from the housing is fixedly provided with a temperature controller. An evaporation port is fixedly arranged on the temperature controller. A valve corresponding to the gas guide pipe is arranged on the gas guide pipe.

[0006] Preferably, the cleaning mechanism includes a brush. A sliding plate is slidably arranged on the inner wall of the housing near the gas inlet. The sliding plate is slidably arranged on the inner wall of the housing through a sliding rod. The brush is fixedly arranged on the side wall of the sliding plate close to the inner wall of the housing, and the brush is arranged close to the filter plate. A transmission mechanism corresponding to the sliding plate is arranged on the housing.

[0007] Preferably, the transmission mechanism includes a motor, which is fixedly arranged on the outer wall of the shell, and the output end of the motor is fixedly connected to a rotating rod, which is rotatably arranged through the side wall of the shell, and a rotating wheel is fixedly arranged on one end of the rotating rod located in the shell, and a transmission groove corresponding to the rotating wheel is opened on the side wall of the skateboard, and the rotating wheel is rotatably set in the transmission groove, and a half-circle of latching teeth is fixedly arranged on the side wall of the rotating wheel in a circumferential direction, and latching tooth grooves corresponding to the latching teeth are opened on the side walls on both sides of the transmission groove.

[0008] Preferably, the pressurizing mechanism includes a boosting plate, which is slidably arranged in the shell, and the boosting plate is connected to the upper inner wall of the shell through a spring. A winding disk is rotatably sleeved on the rotating rod, and a chain is wound on the winding disk. One end of the chain away from the winding disk is fixedly arranged on the boosting plate, and the rotating rod is provided with a connecting mechanism corresponding to the winding disk.

[0009] Preferably, the connecting mechanism includes a clamping rod, which is slidably arranged on the side wall of the rotating rod and is L-shaped. A plurality of clamping grooves corresponding to the clamping rod are circumferentially opened on the side wall of the winding disk. The clamping rod is slidably arranged on a push plate on the side away from the winding disk. The push plate is annularly slidably sleeved on the rotating rod. A corresponding return spring is provided on the clamping rod. A pressure rod is fixedly connected to the side wall of the push plate. The pressure rod is L-shaped, and one end of the pressure rod slides through the side wall of the shell.

[0010] A distillation method for extracting helium from natural gas BOG based on the cryogenic distillation device of claim 5, comprising the following steps:

[0011] S1, first open the sealing cover of the air inlet, close the valve, press the pressure rod to drive the push plate to push the clamping rod into the clamping slot, complete the connection between the winding disk and the rotating rod, turn on the motor to drive the rotating rod to rotate, and then drive the winding disk to rotate the winding chain, thereby pulling the booster plate down to the lowest point.

[0012] S2, introduce natural gas BOG into the shell through the air inlet, loosen the pressure rod to reset the clamping rod to release the connection between the reel and the rotating rod, then the reel reverses to loosen the chain, the booster plate resets upward and sucks natural gas BOG into the shell, and the natural gas BOG enters the shell after being filtered by the filter plate.

[0013] S3, during the process of natural gas BOG suction, the motor drives the impeller to rotate in the transmission groove, and the latch teeth push the latch teeth groove, which can drive the slide plate to slide up and down, thereby driving the brush to brush and clean the filter plate, so as to prevent the dust and impurities in the natural gas BOG from accumulating on the filter plate and affecting the efficiency of gas entry.

[0014] S4, after the gas is sucked into the shell, the sealing cover is covered, and then the pressure rod is pressed to drive the push plate to push the card rod into the card slot, so that the connection between the winding disk and the rotating rod is made, thereby pulling the pressurizing plate down again to pressurize the gas in the shell. After the pressurization is completed, the temperature of the temperature controller 5 is controlled to -290°C, and the valve is opened to allow the pressurized gas to enter the temperature controller 5 through the air duct to liquefy the mixed gas, and then the temperature is raised to -260°C to evaporate the helium. The required helium can be obtained through the evaporation port, completing the process of low-temperature distillation of helium.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: through the cooperation between the rotating wheel and the transmission groove, when the motor drives the rotating wheel to rotate, the slide plate can be driven to slide back and forth up and down, thereby driving the brush to continuously brush and clean the filter plate, effectively avoiding the accumulation of dust and impurities on the filter plate affecting the efficiency of the mixed gas entering the shell, and through the cooperation of the push plate and the clamping rod, the pressure rod drives the push plate to push the clamping rod into the clamping groove on the winding disk, so that the winding disk can be connected with the rotating rod, so that the rotating rod can drive the winding disk to rotate the winding chain, and the booster plate can be pulled down to complete the gas boosting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a cryogenic distillation device for extracting helium from natural gas BOG proposed by the present invention;

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of a cryogenic distillation device for extracting helium from natural gas BOG proposed by the present invention after the side plate of the shell is cut open;

[0018] Figure 3 for Figure 2 A schematic diagram of the side structure of

[0019] Figure 4 for Figure 3 The structural diagram at A in the middle;

[0020] Figure 5 It is a schematic diagram of the structure on the side wall of the skateboard.

[0021] In the figure: 1 housing, 2 air inlet, 3 motor, 4 air duct, 5 temperature controller, 6 evaporation port, 7 pressure rod, 8 valve, 9 boost plate, 10 spring, 11 chain, 12 rotating rod, 13 rotating wheel, 14 slide plate, 15 winding disk, 16 sliding rod, 17 brush, 18 clamping rod, 19 push plate, 20 transmission groove, 21 filter plate. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figures 1 - 5, a low-temperature rectification device for extracting helium from natural gas BOG, comprising a housing 1. A gas inlet 2 is fixedly arranged on the side wall of the housing 1. A filter plate 21 is fixedly arranged at one end of the gas inlet 2 inside the housing 1. A sealing cover is arranged on the gas inlet 2. A cleaning mechanism corresponding to the filter plate 21 is arranged inside the housing 1. The cleaning mechanism includes a brush 17. A sliding plate 14 is slidably arranged on the inner wall of the housing 1 near the gas inlet 2. The sliding plate 14 is slidably arranged on the inner wall of the housing 1 through a sliding rod 16. The brush 17 is fixedly arranged on the side wall of the sliding plate 14 close to the inner wall of the housing 1, and the brush 17 is arranged close to the filter plate 21. A transmission mechanism corresponding to the sliding plate 14 is arranged on the housing 1. The transmission mechanism includes a motor 3. The motor 3 is fixedly arranged on the outer wall of the housing 1. The output end of the motor 3 is fixedly connected with a rotating rod 12. The rotating rod 12 rotates through the side wall of the housing 1. A rotating wheel 13 is fixedly arranged at one end of the rotating rod 12 inside the housing 1. A transmission groove 20 corresponding to the rotating wheel 13 is formed on the side wall of the sliding plate 14. The rotating wheel 13 is rotatably arranged in the transmission groove 20. A semi-circle of teeth is circumferentially fixedly arranged on the side wall of the rotating wheel 13. Tooth grooves corresponding to the teeth are formed on both side walls of the transmission groove 20. A gas pressurizing mechanism is arranged inside the housing 1. The pressurizing mechanism includes a pressurizing plate 9. The pressurizing plate 9 is slidably arranged inside the housing 1. The pressurizing plate 9 is connected to the upper inner wall of the housing 1 through a spring 10. A winding disc 15 is rotatably sleeved on the rotating rod 12. A chain 11 is wound around the winding disc 15. One end of the chain 11 away from the winding disc 15 is fixedly arranged on the pressurizing plate 9. A connecting mechanism corresponding to the winding disc 15 is arranged on the rotating rod 12. The connecting mechanism includes a clamping rod 18. The clamping rod 18 is slidably arranged on the side wall of the rotating rod 12, and the clamping rod 18 is L-shaped. A plurality of clamping grooves corresponding to the clamping rod 18 are circumferentially formed on the side wall of the winding disc 15. A push plate 19 is slidably arranged on the side of the clamping rod 18 away from the winding disc 15. The push plate 19 is annularly slidably sleeved on the rotating rod 12. A return spring corresponding to the clamping rod 18 is arranged on the clamping rod 18. A pressure rod 7 is fixedly connected to the side wall of the push plate 19. The pressure rod 7 is L-shaped, and one end of the pressure rod 7 slidably penetrates through the side wall of the housing 1. A gas guide pipe 4 is also fixedly arranged on the side wall of the housing 1. One end of the gas guide pipe 4 away from the housing 1 is fixedly arranged with a temperature controller 5. An evaporation port 6 is fixedly arranged on the temperature controller 5. A valve 8 corresponding to the gas guide pipe 4 is arranged on the gas guide pipe 4. Through the cooperation of the rotating wheel 13 and the transmission groove 20, when the motor 3 drives the rotating wheel 13 to rotate, the sliding plate 14 can be driven to slide up and down reciprocally, so as to drive the brush 17 to continuously brush and clean the filter plate 21, effectively avoiding the accumulation of dust and impurities on the filter plate 21 and affecting the efficiency of the mixed gas entering the housing 1. Through the cooperation of the push plate 19 and the clamping rod 18, pressing the pressure rod 7 drives the push plate 19 to push the clamping rod 18 into the clamping groove on the winding disc 15, so as to connect the winding disc 15 and the rotating rod 12, and then the rotating rod 12 can drive the winding disc 15 to rotate and wind the chain 11, so as to pull the pressurizing plate 9 to slide down to complete gas pressurization.

[0024] A distillation method for extracting helium from natural gas BOG based on the low-temperature distillation device of claim 5, comprising the following steps:

[0025] S1, first open the sealing cover of the air inlet 2, close the valve 8, press the pressure rod 7 to drive the push plate 19 to push the clamping rod 18 into the clamping groove, complete the connection between the winding disk 15 and the rotating rod 12, turn on the motor 3 to drive the rotating rod 12 to rotate, and then drive the winding disk 15 to rotate the winding chain 11, thereby pulling the booster plate 9 to slide down to the lowest point.

[0026] S2, natural gas BOG is introduced into the housing 1 through the air inlet 2, the pressure rod 7 is loosened to reset the clamping rod 18 to release the connection between the winding disk 15 and the rotating rod 12, and the winding disk 15 is reversed to loosen the chain 11, and the booster plate 9 is reset upward and sucks the natural gas BOG into the housing 1, and the natural gas BOG enters the housing 1 after being filtered by the filter plate 21.

[0027] S3, during the process of natural gas BOG suction, the motor 3 drives the impeller 13 to rotate in the transmission groove 20, and the latching teeth push the latching groove, thereby driving the slide plate 14 to slide up and down reciprocatingly, thereby driving the brush 17 to brush and clean the filter plate 21, so as to prevent the dust impurities in the natural gas BOG from accumulating on the filter plate 21 and affecting the efficiency of gas entry.

[0028] S4, after the gas is sucked into the shell 1, the sealing cover is covered, and the pressure rod 7 is pressed to drive the push plate 19 to push the clamping rod 18 into the clamping groove, so that the winding disk 15 is connected with the rotating rod 12, thereby pulling the pressurizing plate 9 down again to pressurize the gas in the shell 1. After the pressurization is completed, the temperature of the temperature controller 5 is controlled to -290°C, and the valve 8 is opened to allow the pressurized gas to enter the temperature controller 5 through the air guide pipe 4, so that the mixed gas is liquefied, and then the temperature is raised to -260°C to evaporate the helium. The required helium can be obtained through the evaporation port 6, and the process of low-temperature distillation of helium is completed.

[0029] In the present invention, when extracting helium from natural gas BOG, first open the sealing cover of the air inlet 2, close the valve 8, press the pressure rod 7 to drive the push plate 19 to push the clamping rod 18 into the clamping groove, complete the connection between the winding disc 15 and the rotating rod 12, turn on the motor 3 to drive the rotating rod 12 to rotate, and then drive the winding disc 15 to rotate the winding chain 11, thereby pulling the supercharging plate 9 to slide down to the lowest point, and introduce natural gas BOG into the shell 1 through the air inlet 2, release the pressure rod 7 to reset the clamping rod 18 to release the connection between the winding disc 15 and the rotating rod 12, at this time, the winding disc 15 reverses to relax the chain 11, the supercharging plate 9 resets upward and sucks the natural gas BOG into the shell 1, and the natural gas BOG enters the shell 1 after being filtered by the filter plate 21. During the process of sucking the natural gas BOG, the motor 3 drives the runner 13 in the transmission groove 20 The inner rotation can drive the slide plate 14 to slide up and down reciprocatingly by pushing the tooth groove through the tooth, thereby driving the brush 17 to brush and clean the filter plate 21 to prevent the dust impurities in the natural gas BOG from accumulating on the filter plate 21 and affecting the efficiency of gas entry. After the gas is sucked into the shell 1, the sealing cover is covered, and the pressure rod 7 is pressed to drive the push plate 19 to push the card rod 18 into the card groove, so that the connection between the winding disk 15 and the rotating rod 12 is made, thereby pulling the boosting plate 9 down again to boost the gas in the shell 1. After the boosting is completed, the temperature of the temperature controller 5 is controlled to -290°C, and the valve 8 is opened to allow the boosted gas to enter the temperature controller 5 through the air guide pipe 4, so that the mixed gas is liquefied, and then the temperature is raised to -260°C to evaporate the helium. The required helium can be obtained through the evaporation port 6, and the process of low-temperature distillation of helium is completed.

[0030] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A low-temperature rectification device for extracting helium from natural gas BOG, comprising a housing (1), characterized in that, An air inlet (2) is fixedly arranged on the side wall of the housing (1). A filter plate (21) is fixedly arranged at one end of the air inlet (2) located inside the housing (1). A sealing cover is arranged on the air inlet (2). A cleaning mechanism corresponding to the filter plate (21) is arranged inside the housing (1). The cleaning mechanism includes a brush (17). A sliding plate (14) is slidably arranged on the inner wall of one side of the housing (1) close to the air inlet (2). The sliding plate (14) is slidably arranged on the inner wall of the housing (1) through a sliding rod (16). The brush (17) is fixedly arranged on the side wall of the sliding plate (14) close to the inner wall of the housing (1), and the brush (17) is arranged close to the filter plate (21). A transmission mechanism corresponding to the sliding plate (14) is arranged on the housing (1). The transmission mechanism includes a motor (3). The motor (3) is fixedly arranged on the outer wall of the housing (1). The output end of the motor (3) is fixedly connected with a rotating rod (12). The rotating rod (12) rotatably penetrates through the side wall of the housing (1). A rotating wheel (13) is fixedly arranged at one end of the rotating rod (12) located inside the housing (1). A transmission groove (20) corresponding to the rotating wheel (13) is formed in the side wall of the sliding plate (14). The rotating wheel (13) is rotatably arranged in the transmission groove (20), and a semi-circle of teeth is circumferentially fixedly arranged on the side wall of the rotating wheel (13). Tooth grooves corresponding to the teeth are formed in both side walls of the transmission groove (20). A gas pressurizing mechanism is arranged inside the housing (1). The pressurizing mechanism includes a pressurizing plate (9). The pressurizing plate (9) is slidably arranged inside the housing (1). The pressurizing plate (9) is connected to the upper inner wall of the housing (1) through a spring (10). A winding disc (15) is rotatably sleeved on the rotating rod (12). A chain (11) is wound around the winding disc (15). One end of the chain (11) far from the winding disc (15) is fixedly arranged on the pressurizing plate (9). A connecting mechanism corresponding to the winding disc (15) is arranged on the rotating rod (12). The connecting mechanism includes a clamping rod (18). The clamping rod (18) is slidably arranged on the side wall of the rotating rod (12), and the clamping rod (18) is L-shaped. A plurality of clamping grooves corresponding to the clamping rod (18) are circumferentially formed in the side wall of the winding disc (15). A push plate (19) is slidably arranged on the side of the clamping rod (18) far from the winding disc (15). The push plate (19) is annularly and slidably sleeved on the rotating rod (12). A reset spring corresponding to the clamping rod (18) is arranged on the clamping rod (18). A pressure rod (7) is fixedly connected to the side wall of the push plate (19). The pressure rod (7) is L-shaped, and one end of the pressure rod (7) slidably penetrates through the side wall of the housing (1). An air guide pipe (4) is also fixedly arranged on the side wall of the housing (1). A temperature controller (5) is fixedly arranged at one end of the air guide pipe (4) far from the housing (1). An evaporation port (6) is fixedly arranged on the temperature controller (5). A valve (8) corresponding to the air guide pipe (4) is arranged on the air guide pipe (4).

2. A rectification method for a low-temperature rectification device for extracting helium from natural gas BOG according to claim 1, characterized in that The following steps are involved: S1, first open the sealing cover of the air inlet (2), close the valve (8), press the pressure rod (7) to drive the push plate (19) to push the clamping rod (18) into the clamping groove, complete the connection between the winding disk (15) and the rotating rod (12), turn on the motor (3) to drive the rotating rod (12) to rotate, and then drive the winding disk (15) to rotate the winding chain (11), thereby pulling the booster plate (9) down to the lowest point; S2, natural gas BOG is introduced into the housing (1) through the air inlet (2), the pressure rod (7) is released to allow the clamping rod (18) to reset and release the connection between the reel (15) and the rotating rod (12), at which time the reel (15) is reversed to loosen the chain (11), the booster plate (9) is reset upward and sucks the natural gas BOG into the housing (1), and the natural gas BOG is filtered through the filter plate (21) and then enters the housing (1); S3, during the process of natural gas BOG inhalation, the motor (3) drives the wheel (13) to rotate in the transmission groove (20), and the latching teeth push the latching groove, thereby driving the slide plate (14) to slide up and down reciprocatingly, thereby driving the brush (17) to brush and clean the filter plate (21), thereby preventing dust impurities in the natural gas BOG from accumulating on the filter plate (21) and affecting the efficiency of gas inhalation; S4, after the gas is sucked into the shell (1), the sealing cover is closed, and the pressure rod (7) is pressed to drive the push plate (19) to push the clamping rod (18) into the clamping groove, so that the winding disk (15) is connected with the rotating rod (12), thereby pulling the pressurizing plate (9) downward again to pressurize the gas in the shell (1). After the pressurization is completed, the temperature of the temperature controller (5) is controlled to -290°C, and the valve (8) is opened to allow the pressurized gas to enter the temperature controller (5) through the gas guide pipe (4), so that the mixed gas is liquefied, and then the temperature is raised to -260°C to allow the helium to evaporate. The required helium can be obtained through the evaporation port (6), completing the process of low-temperature distillation of helium.

Images