A low pressure fuel gas recycling system

Abstract

The utility model discloses a kind of low-pressure fuel gas recycling systems, including the liquid separator tank, tail gas gas cabinet, tail gas compressor and control cabinet connected in sequence, power module and controller are arranged in control cabinet;The tail gas gas cabinet includes gas cabinet main body, cabinet top, support frame, piston, T baffle;The piston top part is respectively connected with two symmetrically arranged guide components, guide component includes guide pillar, guide sleeve, guide sleeve limiting mechanism when guide pillar is individually moved to the limiting of guide sleeve;The utility model is reconstructed to tail gas gas cabinet, can effectively store low-pressure fuel gas after recovery, avoid the problem of fuel gas leakage;Effective sealing is realized by setting inside rubber sealing membrane and outside rubber sealing membrane;Piston is guided by setting guide component, solve the problem that existing piston guide wheel causes sealing membrane leakage by abrasion to sealing membrane.

Description

Technical Field

[0001] This utility model relates to the technical field of fuel gas recovery systems, specifically to a low-pressure fuel gas recovery and utilization system. Background Technology

[0002] The low-pressure flammable gases emanating from the hydrogenation production unit and various gas production points in the tank farm primarily consist of fuel gas. This fuel gas is a mixture of non-condensable oil and gas gases with a small amount of hydrogen. Its main components include propylene, isobutane, n-butane, isopentane, n-pentane, and hydrogen. Calculations show that the lower explosive limit of this mixed fuel gas is 1.63%. Therefore, a fuel gas recovery system is necessary to recover the fuel gas.

[0003] Fuel gas recovery typically involves storing it in a tail gas holder. However, commonly used tail gas holders seal the gas by using a rubber mold placed between the inner wall of the holder and the outer wall of the piston. The piston is guided by pulleys, which move along the surface of the rubber mold during the guiding process, pressing the rubber mold into contact with the inner wall of the holder. However, this guiding method usually causes significant wear on the rubber mold. Damage to the rubber mold can affect the sealing of the gas holder, leading to fuel gas leakage, which poses a certain danger. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a low-pressure fuel gas recovery and utilization system that can effectively seal and store the recovered fuel gas to avoid fuel gas leakage.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0006] A low-pressure fuel gas recovery and utilization system includes a liquid separator, a tail gas holder, a tail gas compressor, and a control cabinet connected in sequence. The control cabinet houses a power module and a controller. The tail gas holder includes a main body, a top, a support frame, a piston, and a T-baffle. A T-baffle bracket is also provided at the bottom of the main body to support the T-baffle. An outer rubber sealing membrane is provided between the outer side of the T-baffle and the inner wall of the main body, and an inner rubber sealing membrane is provided between the inner side of the T-baffle and the outer side of the piston. Two symmetrically arranged guide components are connected to the top of the piston. Each guide component includes a guide post. The guide sleeve includes a guide sleeve limiting mechanism that limits the guide sleeve when the guide column moves independently. The controlled end of the guide sleeve limiting mechanism is connected to the output end of the controller. The bottom of the guide column is connected to the top of the piston. The guide column and the guide sleeve are slidably connected. A guide sleeve limiting plate is provided in the middle of the guide sleeve to limit the guide sleeve at the top of the cabinet when the guide column moves. An annular limiting block is provided on the inner wall of the bottom of the guide sleeve to limit the top of the guide column. The guiding assembly also includes an infrared displacement sensor that detects the upward movement distance of the guide column and ensures that the guide sleeve can move with the guide column. The output end of the infrared displacement sensor is connected to the input end of the controller.

[0007] The aforementioned low-pressure fuel gas recovery and utilization system includes a guide sleeve limiting mechanism comprising two L-shaped clamping plates symmetrically arranged about the center of the guide sleeve. The clamping plates have arc-shaped grooves on opposite sides corresponding to the upper and lower parts of the guide sleeve. The bottom of the clamping plates is connected to a connecting plate, which is threadedly connected to a lead screw. The threads on the two connecting plates are in opposite directions. The lead screw is mounted on a mounting frame, which is equipped with a motor that drives the lead screw to rotate. The controlled end of the motor is connected to the output end of a controller. The mounting frame also has a guide shaft that is slidably connected to the clamping plates. A vertical sliding frame is provided below the horizontal end of the clamping plates. A fixing block is provided on the top of the cabinet at the bottom of the vertical sliding frame. The fixing block has symmetrically arranged sliding grooves, and the vertical sliding frame is slidably positioned within these grooves.

[0008] In the aforementioned low-pressure fuel gas recovery and utilization system, the gas holder body has three peripheral platforms spaced apart from top to bottom, and the mounting frame is installed on the top peripheral platform.

[0009] In the aforementioned low-pressure fuel gas recovery and utilization system, the top of the piston is also connected to a piston leveling assembly, which consists of three sets that are evenly distributed circumferentially.

[0010] In the aforementioned low-pressure fuel gas recovery and utilization system, the piston leveling assembly includes a counterweight and a first steel wire rope and a second steel wire rope connected to the counterweight, respectively, with the first and second steel wire ropes arranged in parallel. A first pulley group is provided on the outer wall of the gas holder body, and a second pulley group and a third pulley group are respectively provided on the inner wall of the gas holder body corresponding to the first pulley group. Two rope grooves are symmetrically arranged on the first, second, and third pulley groups. The first steel wire rope passes through the left rope groove of the first and second pulley groups in sequence and then connects to the top of the vertically corresponding piston. The second steel wire rope passes through the right rope groove of the first, second, and third pulley groups in sequence and then connects to the top of the vertically corresponding piston. The parts of the first steel wire rope connecting to the piston and the parts of the second steel wire rope connecting to the piston are symmetrically arranged.

[0011] In the aforementioned low-pressure fuel gas recovery and utilization system, a vent hole is provided at the center of the cabinet top, and a vent cap is provided at the top of the vent hole. The vent cap includes a lower support seat provided on the cabinet top outside the vent hole, and a circularly evenly distributed column is provided on the top surface of the lower support seat. An umbrella-shaped cap is provided on the top of the column, and a metal mesh is provided between adjacent columns.

[0012] In the aforementioned low-pressure fuel gas recovery and utilization system, the piston includes a piston enclosure, a corrugated plate on the outside of the piston enclosure, an upper piston platform on the upper outer periphery of the piston enclosure, a concrete support seat on the bottom periphery of the piston enclosure, a lower piston platform above the concrete support seat, a piston plate on the inner side of the concrete support seat, and a ladder connecting the upper and lower piston platforms.

[0013] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0014] This invention provides a low-pressure fuel gas recovery and utilization system. By modifying the exhaust gas holder, it can effectively store the recovered low-pressure fuel gas and avoid fuel gas leakage. Effective sealing is achieved by setting inner and outer rubber sealing membranes. By setting a guide component to guide the piston, the problem of sealing membrane leakage caused by wear of the existing piston guide wheel is solved. By setting a piston leveling component, the piston can be automatically leveled, solving the problem of imbalance during piston movement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the specific structure of the present utility model; Figure 2 This is a schematic diagram of the specific structure of the guide component described in this utility model; Figure 3 This is a plan view of the guide assembly described in this utility model; Figure 4 This is a schematic diagram of the specific structure of the guide sleeve limiting mechanism described in this utility model; Figure 5 This is a top view of the guide sleeve limiting mechanism of this utility model when the guide sleeve is limited; Figure 6 This is a top view of the guide sleeve limiting mechanism when the limiting of the guide sleeve is removed in this utility model; Figure 7 This is a schematic diagram of the specific structure of the piston leveling assembly described in this utility model; Figure 8 This is a schematic diagram of the specific structure of the connection between the piston and the T-baffle of this utility model; Figure 9 This is a schematic diagram of the specific structure of the ventilation cap described in this utility model.

[0016] Among them: 10. Separating tank, 20. Tail gas holder, 30. Tail gas compressor, 40. Vent cap, 50. Guide assembly, 60. Piston leveling assembly; 21. Gas holder body; 22. Top of the holder; 23. Peripheral platform; 24. Support frame; 25. Piston; 26. T-baffle; 27. Outer rubber sealing membrane; 28. Inner rubber sealing membrane; 29. ​​T-baffle bracket. 251. Piston enclosure; 252. Upper piston platform; 253. Lower piston platform; 254. Piston plate; 255. Corrugated plate; 256. Concrete support base; 257. Ladders for upper and lower platforms. 41. Lower support base; 42. Umbrella-shaped cap; 43. Column; 44. Metal mesh; 51. Guide post; 52. Guide sleeve; 53. Detection plate; 54. Locking block; 55. Infrared displacement sensor; 56. Guide sleeve limiting plate; 57. Guide sleeve limiting mechanism; 571. Clamping plate, 572. Mounting bracket, 573. Connecting plate, 574. Lead screw, 575. Guide shaft, 576. Motor, 577. Fixing block, 578. Vertical sliding bracket, 579. Slide groove; 61. Counterweight, 62. First wire rope, 63. Second wire rope, 64. First pulley block, 65. Second pulley block, 66. Third pulley block. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] A low-pressure fuel gas recovery and utilization system, such as Figures 1 to 9 As shown, the system includes a liquid separator 10, a tail gas holder 20, a tail gas compressor 30, and a control cabinet connected in sequence. The liquid separator 10 is used to absorb low-pressure flammable gases from the hydrogenation production unit and various gas production points in the tank area and to complete the liquid separation. The tail gas holder 20 is used to store the separated gas. The tail gas compressor 30 is used to pressurize the gas in the tail gas holder when it is released. The control cabinet is equipped with a power module and a controller.

[0019] The exhaust gas holder 20 includes a main body 21, a top 22, a support frame 24, a piston 25, and a T-baffle 26. The bottom of the main body 21 is provided with an air inlet and an air outlet. The bottom of the main body 21 is also provided with a T-baffle bracket 29 for supporting the T-baffle 26. An outer rubber sealing membrane 27 is provided between the outer side of the T-baffle 26 and the inner wall of the main body 21. An inner rubber sealing membrane 28 is provided between the inner side of the T-baffle 26 and the outer side of the piston 25. The outer rubber sealing membrane 27 and the inner rubber sealing membrane 28 are connected by angle steel, pressure plate, buckle, and bolt.

[0020] The gas holder body 21 has three spaced-out peripheral platforms 23 on its outer side from top to bottom. The peripheral platforms 23 are connected to each other and the bottom peripheral platform 23 is connected to the ground by inclined ladders, which facilitates the maintenance of the top of the cabinet.

[0021] Two symmetrically arranged guide components 50 are connected to the top of the piston 25. Each guide component 50 includes a guide post 51, a guide sleeve 52, an infrared displacement sensor 55, and a guide sleeve limiting mechanism 57. The bottom of the guide post 51 is connected to the top of the piston 25, and the guide post 51 is slidably connected to the guide sleeve 52. A guide sleeve limiting plate 56 is provided in the middle of the guide sleeve 52 to limit the guide sleeve at the top of the cabinet when the guide post moves.

[0022] The bottom of the guide sleeve 52 is provided with a slot, and the lower part of the guide post 51 is provided with a detection plate 53 that works with the infrared displacement sensor 55 to detect the lifting distance of the guide post. The length of the detection plate is greater than the outer wall diameter of the guide post and the guide sleeve. The middle part of the detection plate 53 is also provided with a card block 54 that connects to the slot.

[0023] An annular limiting block is provided on the bottom inner wall of the guide sleeve 52 to limit the top of the guide post 51, preventing the guide post from coming out of the guide sleeve when it descends.

[0024] The output of the infrared displacement sensor 55 is connected to the input of the controller and is used to send the position signal of the detection board 53 to the controller.

[0025] The guide sleeve limiting mechanism 57 includes two L-shaped pressing plates 571 arranged symmetrically about the center of the guide sleeve 52. The pressing plates 571 have arc-shaped grooves on opposite sides that correspond to the upper and lower parts of the guide sleeve. The bottom of the pressing plates 571 is connected to the connecting plate 573. The connecting plate 573 is threadedly connected to the lead screw 574. The threads on the two connecting plates 573 are in opposite directions.

[0026] The lead screw 574 is mounted on the mounting bracket 572 set on the top peripheral platform 23. The mounting bracket 572 is equipped with a motor 576 that drives the lead screw to rotate. The controlled end of the motor 576 is connected to the output end of the controller. The mounting bracket 572 is also equipped with a guide shaft 575 that is slidably connected to the pressure plate 571.

[0027] A vertical sliding frame 578 is provided below the horizontal end of the pressing plate. A fixing block 577 is provided on the cabinet top 22 at the bottom of the vertical sliding frame 578. A symmetrically arranged sliding groove 579 is provided on the fixing block 577. The vertical sliding frame 578 is slidably disposed in the sliding groove 579.

[0028] During the gas storage process in the exhaust gas holder, when the guide column moves upward, the middle of the guide sleeve 52 is limited at the top of the holder by the guide sleeve limiting plate 56, and at the same time, the top of the guide sleeve is pressed by the guide sleeve limiting mechanism 57. Specifically, as follows... Figure 5 As shown, the size of the arc grooves on the two clamping plates 571 after being enclosed is greater than or equal to the outer diameter of the guide post and less than the outer diameter of the guide sleeve. The clamping plates clamp the guide sleeve.

[0029] When the locking block on the guide post is engaged in the slot of the guide sleeve, the infrared displacement sensor detects the position of the detection plate. Once the displacement reaches the preset displacement in the controller, the motor is activated to drive the two clamping plates to move in opposite directions, thus removing the restriction on the guide sleeve. The guide post then pushes the guide sleeve upward together.

[0030] During the exhaust gas holder venting process, if the guide sleeve has not moved before, the guide column can move directly downward under the action of the piston and the limit of the guide sleeve. If the guide sleeve has moved before, when the top of the guide column contacts the annular limit block at the bottom of the guide sleeve as the guide column descends with the piston, it will drive the guide sleeve to move downward together until the guide sleeve limit plate contacts the top of the holder and stops. Then, the guide sleeve can be pressed back down by the guide sleeve limit mechanism.

[0031] The top of piston 25 is also connected to piston leveling assembly 60. Specifically, piston leveling assembly 60 has three sets and is evenly distributed in a circumferential direction.

[0032] The piston leveling assembly 60 includes a counterweight 61 and a first wire rope 62 and a second wire rope 63 respectively connected to the counterweight 61. The first wire rope 62 and the second wire rope 63 are arranged in parallel.

[0033] A first pulley group 64 is provided on the outer wall of the gas holder body 21. A second pulley group 65 and a third pulley group 66 are respectively provided on the inner wall of the gas holder body 21 corresponding to the first pulley group 64. Two rope grooves are symmetrically arranged on the first pulley group 64, the second pulley group 65 and the third pulley group 66. The first steel wire rope 62 passes through the left rope groove of the first pulley group 64 and the second pulley group 65 in sequence and is connected to the top of the vertically corresponding piston 25. The second steel wire rope 63 passes through the right rope groove of the first pulley group 64, the second pulley group 65 and the third pulley group 66 in sequence and is connected to the top of the vertically corresponding piston 25. The parts of the first steel wire rope 62 connected to the piston are symmetrically arranged with the parts of the second steel wire rope 63 connected to the piston.

[0034] By cooperating with the counterweight 61, the first wire rope 62, and the second wire rope 63, after one end of the piston 25 is pulled up, the other end moves in the opposite direction to the direction of the force, thus achieving automatic leveling.

[0035] A ventilation hole is provided in the center of the cabinet top 22. A ventilation cap 40 is provided on the top of the ventilation hole. The ventilation cap 40 includes a lower support base 41 provided on the cabinet top 22 outside the ventilation hole. The top surface of the lower support base 41 is provided with a circularly evenly distributed column 43. The top of the column 43 is provided with an umbrella-shaped cap 42. A metal mesh 44 is provided between adjacent columns 43.

[0036] In this embodiment, the piston 25 includes a piston enclosure 251, a corrugated plate 255 is provided on the outer side of the piston enclosure 251, an upper piston platform 252 is provided on the upper outer periphery of the piston enclosure 251, a concrete support seat 256 is provided on the bottom periphery of the piston enclosure 251, a lower piston platform 253 is provided above the concrete support seat 256, a piston plate 254 is provided on the inner side of the concrete support seat 256, and a ladder 257 is provided between the upper piston platform 252 and the lower piston platform 253.

[0037] Inspection holes are provided on piston 25 and gas holder body 21 for easy maintenance. Vent hole and observation window are provided on top of the cabinet 22. The observation window can be opened and closed.

[0038] This invention provides a low-pressure fuel gas recovery and utilization system. By modifying the exhaust gas holder, it can effectively store the recovered low-pressure fuel gas and avoid fuel gas leakage. Effective sealing is achieved by setting inner and outer rubber sealing membranes. By setting a guide component to guide the piston, the problem of sealing membrane leakage caused by wear of the existing piston guide wheel is solved. By setting a piston leveling component, the piston can be automatically leveled, solving the problem of imbalance during piston movement.

Claims

1. A low-pressure fuel gas recovery and utilization system, characterized in that: The system includes a liquid separator (10), a tail gas holder (20), a tail gas compressor (30), and a control cabinet connected in sequence. The control cabinet is equipped with a power module and a controller. The tail gas holder (20) includes a main body (21), a top (22), a support frame (24), a piston (25), and a T-baffle (26). The bottom of the main body (21) is also equipped with a T-baffle bracket (29) for supporting the T-baffle (26). An outer rubber sealing membrane (27) is provided between the outer side of the T-baffle (26) and the inner wall of the main body (21), and an inner rubber sealing membrane (28) is provided between the inner side of the T-baffle (26) and the outer side of the piston (25). The top of the piston (25) is connected to two symmetrically arranged guide components (50). The guide assembly (50) includes a guide post (51), a guide sleeve (52), and a guide sleeve limiting mechanism (57) that limits the guide sleeve when the guide post moves alone. The controlled end of the guide sleeve limiting mechanism (57) is connected to the output end of the controller. The bottom of the guide post (51) is connected to the top of the piston (25). The guide post (51) and the guide sleeve (52) are slidably connected. A guide sleeve limiting plate (56) is provided in the middle of the guide sleeve (52) to limit the guide sleeve at the top of the cabinet when the guide post moves. An annular limiting block is provided on the inner wall of the bottom of the guide sleeve (52) to limit the top of the guide post (51). The guide assembly (50) also includes an infrared displacement sensor (55) that detects the upward movement distance of the guide post and ensures that the guide sleeve can move with the guide post. The output end of the infrared displacement sensor (55) is connected to the input end of the controller.

2. The low-pressure fuel gas recovery and utilization system according to claim 1, characterized in that: The guide sleeve limiting mechanism (57) includes two L-shaped clamping plates (571) symmetrically arranged about the center of the guide sleeve (52). The clamping plates (571) have arc-shaped grooves on opposite sides corresponding to the upper and lower parts of the guide sleeve. The bottom of the clamping plates (571) is connected to a connecting plate (573), and the connecting plate (573) is threadedly connected to a lead screw (574). The threads on the two connecting plates (573) are in opposite directions. The lead screw (574) is mounted on a mounting bracket (572), and the mounting bracket (572) is equipped with a mechanism for driving the lead screw to rotate. The motor (576) is connected to the output end of the controller. The mounting bracket (572) is also provided with a guide shaft (575) that is slidably connected to the clamping plate (571). A vertical sliding frame (578) is provided below the horizontal end of the clamping plate. A fixing block (577) is provided on the cabinet top (22) at the bottom of the vertical sliding frame (578). A symmetrically arranged sliding groove (579) is opened on the fixing block (577). The vertical sliding frame (578) is slidably arranged in the sliding groove (579).

3. The low-pressure fuel gas recovery and utilization system according to claim 2, characterized in that: The gas holder body (21) has three peripheral platforms (23) spaced apart from top to bottom on its outer side, and the mounting bracket (572) is set on the top peripheral platform (23).

4. The low-pressure fuel gas recovery and utilization system according to claim 1, characterized in that: The top of the piston (25) is also connected to the piston leveling assembly (60), which has three sets and is evenly distributed in a circumferential direction.

5. A low-pressure fuel gas recovery and utilization system according to claim 4, characterized in that: The piston leveling assembly (60) includes a counterweight (61) and a first steel wire rope (62) and a second steel wire rope (63) respectively connected to the counterweight (61). The first steel wire rope (62) and the second steel wire rope (63) are arranged in parallel. A first pulley group (64) is provided on the outer wall of the gas holder body (21). A second pulley group (65) and a third pulley group (66) are respectively provided on the inner wall of the gas holder body (21) corresponding to the first pulley group (64). The first pulley group (64), the second pulley group (65) and the third pulley group (66) are arranged in parallel. Two rope grooves are symmetrically arranged on the pulley group (66). The first wire rope (62) passes through the left rope groove of the first pulley group (64) and the second pulley group (65) in sequence and then connects to the top of the vertically corresponding piston (25). The second wire rope (63) passes through the right rope groove of the first pulley group (64), the second pulley group (65) and the third pulley group (66) in sequence and then connects to the top of the vertically corresponding piston (25). The part of the first wire rope (62) that connects to the piston is symmetrically arranged with the part of the second wire rope (63) that connects to the piston.

6. A low-pressure fuel gas recovery and utilization system according to claim 1, characterized in that: A ventilation hole is provided in the center of the cabinet top (22), and a ventilation cap (40) is provided on the top of the ventilation hole. The ventilation cap (40) includes a lower support base (41) provided on the cabinet top (22) outside the ventilation hole. The top surface of the lower support base (41) is provided with a column (43) that is evenly distributed in a circle. The top of the column (43) is provided with an umbrella-shaped cap (42). A metal mesh (44) is provided between adjacent columns (43).

7. A low-pressure fuel gas recovery and utilization system according to claim 1, characterized in that: The piston (25) includes a piston enclosure (251), a corrugated plate (255) is provided on the outside of the piston enclosure (251), an upper piston platform (252) is provided on the upper outer periphery of the piston enclosure (251), a concrete support seat (256) is provided on the bottom periphery of the piston enclosure (251), a lower piston platform (253) is provided above the concrete support seat (256), a piston plate (254) is provided on the inner side of the concrete support seat (256), and a ladder (257) is provided between the upper piston platform (252) and the lower piston platform (253).

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