Mixed refrigerant recovery device of LNG factory

Abstract

The utility model discloses a mixed refrigerant recovery device of an LNG factory, which comprises a shell and a one-way gas inlet pipeline installed at the upper end of the left side of the shell in a penetrating manner, a one-way valve is arranged in the one-way gas inlet pipeline, a gas outlet pipeline is installed at the upper end of the shell in a penetrating manner, and a rotary wind collecting plate is arranged in the gas outlet pipeline. And a filtering anti-blocking mechanism is arranged at the rear end of the air collecting plate. According to the mixed refrigerant recycling device of the LNG factory, when leaked gas is compressed, gas is exhausted from a gas outlet pipeline and makes contact with an air collecting plate, the air collecting plate is blown by the gas to rotate, when the air collecting plate rotates, a disc rod is driven through a belt at the rear end, and when the disc rod rotates, a surface round rod can rotate to drive a push rod; and the filter screen is pushed to move and shake back and forth along the limiting grooves through the limiting blocks, impurities can be prevented from being accumulated on the surface of the filter screen, the filter screen is prevented from being blocked, and stable operation of the device is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of mixed refrigerant recovery, in particular to a mixed refrigerant recovery device for an LNG plant. Background Art

[0002] LNG is increasingly being used worldwide for its advantages such as high gasification rate, low carbon emissions, and convenient transportation. As the proportion of natural gas in energy supply increases rapidly, the establishment of large-scale liquefaction plants with low energy consumption and high degree of optimization is of great significance to seize the domestic new energy market and get rid of dependence on imported LNG. Natural gas is pretreated to remove unfavorable components in the liquefaction process (acidic components, moisture, heavy hydrocarbons and mercury, etc.), and then enters the heat exchanger of the refrigeration system to continuously cool down, and condense and separate the mixed refrigerant step by step, and finally turns into liquid at normal pressure (about -160°C) to obtain LNG products. The refrigeration system uses a compressor to pressurize the mixed refrigerant and then throttle it to generate cold energy, thereby achieving cooling treatment of natural gas. Mixed refrigerant compressors generally use centrifugal compressors or reciprocating compressors;

[0003] For example, the mixed refrigerant rapid recovery device with publication number CN214223554U includes a main storage tank, which is connected to the mixed refrigerant compressor inlet separation tank in the mixed refrigerant system through a main pipeline, and the main pipeline is sequentially provided with a compressor, a cooler and a main valve, and a sub-tank is provided in the main storage tank, and the sub-tank is connected to the separation tank in the mixed refrigerant system through an auxiliary pipeline, and a valve is provided on the auxiliary pipeline. The device can directly recover and store low-temperature mixed refrigerant, occupies little space, and reduces the energy consumption of recovering mixed refrigerant;

[0004] The above-mentioned mixed refrigerant rapid recovery device is connected to the separation tank in the mixed refrigerant system through a sub-storage tank through an auxiliary pipeline, which can occupy a small space and reduce the energy consumption of recovering the mixed refrigerant. However, during the compression process, it is affected by the characteristics of the compressor and will produce a certain amount of refrigerant leakage. The conventional operation is to discharge the leaked gas directly into the venting system, resulting in a waste of mixed refrigerant, and it also does not meet the relevant environmental protection requirements. Utility Model Content

[0005] The utility model aims to provide a mixed refrigerant recovery device for an LNG plant, so as to solve the problem in the above background technology that the mixed refrigerant is wasted and does not meet the relevant environmental protection requirements.

[0006] To achieve the above object, the utility model provides the following technical solution: a mixed refrigerant recovery device for an LNG plant, comprising a shell and a one-way air inlet pipe installed through the upper end of the left side of the shell, and a one-way valve is arranged inside the one-way air inlet pipe, and an air outlet pipe is installed through the upper end of the shell;

[0007] The air outlet duct has an internal rotating air collecting plate, and a filtering and anti-blocking mechanism is provided at the rear end of the air collecting plate, and the filtering and anti-blocking mechanism can be driven by the air collecting plate;

[0008] A convex block is arranged inside the air outlet pipe, and an indirect connection mechanism is arranged on the right side of the convex block, and the indirect connection mechanism can intermittently output the mixed refrigerant through the convex block.

[0009] Furthermore, an electric telescopic rod is fixedly installed inside the shell, and a piston plate is provided at the output end of the electric telescopic rod, and the piston plate is conveniently positioned to fit the inner wall of the shell.

[0010] Furthermore, the filtering and anti-blocking mechanism is provided with a belt, and the left side of the belt is nested and installed at the rear end of the air collecting plate, and the right side of the belt is nested and installed at the rear end of the disc rod, a round rod is fixedly installed on the surface of the disc rod, and a limiting groove is opened on the inner wall of the air outlet pipe.

[0011] Furthermore, a push rod is nested and installed on the surface of the round rod, and the shape of the push rod is "T" shape, and a filter screen is fixedly installed on the right end of the push rod.

[0012] Furthermore, limit blocks are fixedly installed at the upper and lower ends of the filter screen, and the connection between the limit blocks and the limit grooves is a sliding connection.

[0013] Furthermore, the indirect connection mechanism is provided with a first airbag, and the first airbag is arranged inside the right side of the limiting groove, and an air guide tube is fixedly installed on the right side of the first airbag, and a second airbag is fixedly installed on the right side of the air guide tube, and the right side of the second airbag is fixedly installed on the left side of the protrusion, and the first airbag is an elastic airbag.

[0014] Furthermore, a first magnet is fixedly installed on the right side of the protrusion, a rubber sealing sleeve is fixedly installed inside the air outlet pipe, and a second magnet is arranged inside the rubber sealing sleeve. The rubber sealing sleeve is made of four pieces of rubber, and the magnetism of the second magnet is opposite to that of the first magnet.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. A piston plate capable of squeezing out the mixed refrigerant is provided. When the refrigerant is introduced into the shell through the one-way air inlet pipe, the piston plate is pushed by starting the electric telescopic rod. The piston plate is sealed and fitted with the inner wall of the shell. When the piston plate rises, the gas inside the shell can be directly squeezed out along the air outlet pipe, and the refrigerant can be directly compressed and squeezed out, which is convenient for subsequent recycling and treatment;

[0017] Furthermore, a filter screen capable of pre-processing is provided, and the filter screen is nested inside the air outlet pipe. Through the setting of the filter screen, the recovered leaked gas can be pre-processed and filtered in advance, thereby improving the filtering effect;

[0018] Furthermore, when the leaked gas is compressed, the gas contacts the air collecting plate when it is discharged from the air outlet pipe. The air collecting plate is blown and rotated by the gas. When the air collecting plate rotates, the belt at the rear end drives the disc rod. When the disc rod rotates, the surface round rod rotates and drives the push rod. Due to the "T" shape of the push rod, it can move left and right with the drive of the round rod to push the filter. The filter is pushed to move back and forth along the limit groove through the limit block and shake, which can avoid impurities from accumulating on the surface of the filter, prevent the filter from being blocked, and ensure the stable operation of the device.

[0019] 2. A rubber sealing sleeve that can be opened indirectly is provided to intermittently supply leaked gas, so as to avoid the problem of poor subsequent filtering effect caused by inputting too much gas at one time. As the filter shakes left and right, the filter squeezes the first airbag, and the squeezed first airbag transmits the gas to the second airbag through the air guide tube. The second airbag expands and pushes the convex block. The convex block moves to the right to squeeze the rubber sealing sleeve and push the rubber sealing sleeve open, so that the leaked gas can pass through the rubber sealing sleeve. When the filter moves to the left and does not squeeze the first airbag, the first airbag can expand due to its own elasticity to suck back the gas inside the second airbag and pull the convex block, thus forming an indirect connection effect, which can better allow the leaked gas to be filtered and processed later;

[0020] Furthermore, when the protrusion moves to the right to squeeze open the rubber sealing sleeve, since the first magnet arranged at the right end of the protrusion has opposite magnetic poles to the second magnet, the rubber sealing sleeve can be opened better when the protrusion squeezes open the rubber sealing sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the front cross-sectional structure of the utility model;

[0022] Figure 2 This is a schematic diagram of the front cross-sectional structure of the gas outlet pipe of the utility model;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the wind collecting plate of the utility model;

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of the air collecting plate of the utility model;

[0025] Figure 5 This is a schematic diagram of the side cross-sectional structure of the protrusion of the utility model;

[0026] Figure 6This is a schematic diagram of the three-dimensional structure of the gas outlet pipe of the utility model;

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the utility model.

[0028] In the figure: 1. shell; 2. one-way air inlet duct; 3. electric telescopic rod; 4. piston plate; 5. air outlet duct; 6. air collecting plate; 7. belt; 8. disc rod; 9. round rod; 10. push rod; 11. filter screen; 12. limit block; 13. limit groove; 14. first air bag; 15. air guide tube; 16. second air bag; 17. bump; 18. first magnet; 19. rubber sealing sleeve; 20. second magnet. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Embodiment 1:

[0031] like Figure 1 and Figure 7 The technical solution shown, in order to solve the problem of gas leakage and waste, discloses: a housing 1 and a one-way air inlet pipe 2 installed through the upper left end of the housing 1, and a one-way valve is arranged inside the one-way air inlet pipe 2, an air outlet pipe 5 is installed through the upper end of the housing 1, an electric telescopic rod 3 is fixedly installed inside the housing 1, and a piston plate 4 at the output end of the electric telescopic rod 3, and the piston plate 4 is conveniently located to fit the inner wall of the housing 1;

[0032] In this example, the mixed refrigerant leakage gas generated during the operation of the mixed refrigerant compressor is recovered and buffered through the refrigerant leakage recovery buffer tank, and then enters the refrigerant recovery compressor to be pressurized to a certain pressure, and then passes through the C-level, T-level oil mist filter and the refrigerant recovery compressor oil mist filter to filter the oil mist, and then is sent to the mixed refrigerant compressor inlet buffer tank to participate in the system mixed refrigerant circulation, and finally realizes the effective recycling of the mixed refrigerant. When passing through the refrigerant recovery compressor, a piston plate 4 capable of squeezing out the mixed refrigerant is provided inside the refrigerant compressor. When the refrigerant is injected into the shell 1 through the one-way air inlet pipe 2, the piston plate 4 is pushed by starting the electric telescopic rod 3. The piston plate 4 is sealed and fitted with the inner wall of the shell 1. When the piston plate 4 rises, the gas inside the shell 1 can be directly squeezed out along the air outlet pipe 5, and the refrigerant can be directly compressed and squeezed out, which is convenient for subsequent recycling and processing;

[0033] Embodiment 2:

[0034] like Figure 1-Figure 4 The technical solution shown, in order to solve the problem of poor gas filtering effect, discloses a filter anti-blocking mechanism: an air collecting plate 6 is rotated inside the air outlet pipe 5, and a filter anti-blocking mechanism is arranged at the rear end of the air collecting plate 6, and the filter anti-blocking mechanism can be driven by the air collecting plate 6, and the filter anti-blocking mechanism is provided with a belt 7, and the left side of the belt 7 is nested and installed at the rear end of the air collecting plate 6, and the right side of the belt 7 is nested and installed at the rear end of the disc rod 8, and a round rod 9 is fixedly installed on the surface of the disc rod 8, and a limiting groove 13 is provided on the inner wall of the air outlet pipe 5, and a push rod 10 is nested and installed on the surface of the round rod 9, and the shape of the push rod 10 is "T", and a filter screen 11 is fixedly installed on the right end of the push rod 10, and a limiting block 12 is fixedly installed at the upper and lower ends of the filter screen 11, and the connection mode of the limiting block 12 and the limiting groove 13 is a sliding connection;

[0035] In this example, a filter screen 11 capable of pre-processing in advance is provided, and the filter screen 11 is nested and arranged inside the air outlet pipe 5. Through the setting of the filter screen 11, the recovered leaked gas can be pre-processed and filtered in advance, thereby improving the filtering effect. When the leaked gas is compressed, the gas contacts the air collecting plate 6 when it is discharged from the air outlet pipe 5, and the air collecting plate 6 is blown and rotated by the gas. When the air collecting plate 6 rotates, the disc rod 8 is driven by the belt 7 at the rear end. When the disc rod 8 rotates, the surface round rod 9 can be rotated to drive the push rod 10. Due to the "T" shape setting of the push rod 10, it can be driven by the round rod 9 to move left and right to push the filter screen 11. The filter screen 11 is pushed through the limit block 12 to move back and forth along the limit groove 13 and shake, which can avoid impurities from accumulating on the surface of the filter screen 11, prevent the filter screen 11 from being blocked, and ensure the stable operation of the device.

[0036] Embodiment three:

[0037] like Figure 1 , Figure 2 , Figure 5 and Figure 6The technical solution shown, in order to solve the problem that too much gas may not be fully filtered at one time, discloses an indirect connection mechanism: a protrusion 17 is provided inside the gas outlet pipe 5, and an indirect connection mechanism is provided on the right side of the protrusion 17, and the indirect connection mechanism can intermittently output the mixed refrigerant through the protrusion 17, the indirect connection mechanism is provided with a first air bag 14, and the first air bag 14 is provided inside the right side of the limiting groove 13, and an air guide tube 15 is fixedly installed on the right side of the first air bag 14, and a second air bag 16 is fixedly installed on the right side of the air guide tube 15, and the right side of the second air bag 16 is fixedly installed on the left side of the protrusion 17, the first air bag 14 is an elastic air bag, and a first magnet 18 is fixedly installed on the right side of the protrusion 17, a rubber sealing sleeve 19 is fixedly installed inside the gas outlet pipe 5, and a second magnet 20 is provided inside the rubber sealing sleeve 19, and the rubber sealing sleeve 19 is four pieces of rubber spliced ​​together, and the magnetic properties of the second magnet 20 are opposite to those of the first magnet 18;

[0038] In this example, a rubber sealing sleeve 19 that can be opened indirectly is provided to intermittently supply leaked gas, so as to avoid the problem of poor subsequent filtering treatment effect caused by inputting too much gas at one time. As the filter 11 shakes left and right, the filter 11 squeezes the first airbag 14, and the squeezed first airbag 14 transmits the gas to the second airbag 16 through the air guide tube 15. The second airbag 16 expands and pushes the protrusion 17. The protrusion 17 moves to the right to squeeze the rubber sealing sleeve 19, which can push the rubber sealing sleeve 19 open, so that the leaked gas can pass through the rubber sealing sleeve 19. When the filter 11 moves to the left, it does not squeeze the first airbag 14. At this time, the first airbag 14 can expand and suck back the gas inside the second airbag 16 due to its own elasticity, pulling the protrusion 17, and the second magnet 20 has opposite magnetic properties to the first magnet 18, and can also push the protrusion 17 to move to the left, forming an indirect connection effect, which can better allow the leaked gas to be subsequently filtered. When the protrusion 17 moves to the right to squeeze open the rubber sealing sleeve 19, due to the first magnet 18 set at the right end of the protrusion 17, the magnetic poles of the first magnet 18 and the second magnet 20 are opposite, so when the protrusion 17 squeezes open the rubber sealing sleeve 19, the effect of opening the rubber sealing sleeve 19 can be better.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A mixed refrigerant recovery device for an LNG plant, comprising a shell (1) and a one-way air inlet pipe (2) penetrating the upper end of the left side of the shell (1), wherein a one-way air inlet pipe (2) is provided inside the one-way air inlet pipe (2), and an air outlet pipe (5) is penetrating the upper end of the shell (1); Features: The air outlet duct (5) has an internal rotating air collecting plate (6), and a filtering and anti-blocking mechanism is provided at the rear end of the air collecting plate (6), and the filtering and anti-blocking mechanism can be driven by the air collecting plate (6); A convex block (17) is provided inside the air outlet pipe (5), and an indirect connection mechanism is provided on the right side of the convex block (17), and the indirect connection mechanism can intermittently output the mixed refrigerant through the convex block (17).

2. The mixed refrigerant recovery device of an LNG plant according to claim 1, characterized in that: An electric telescopic rod (3) is fixedly mounted inside the housing (1), and a piston plate (4) is provided at the output end of the electric telescopic rod (3), and the piston plate (4) is conveniently located to fit the inner wall of the housing (1).

3. The mixed refrigerant recovery device of an LNG plant according to claim 1, characterized in that: The filtering and anti-blocking mechanism is provided with a belt (7), and the left side of the belt (7) is nested and installed at the rear end of the air collecting plate (6), and the right side of the belt (7) is nested and installed at the rear end of the disc rod (8), a round rod (9) is fixedly installed on the surface of the disc rod (8), and a limiting groove (13) is provided on the inner wall of the air outlet pipe (5).

4. The mixed refrigerant recovery device of an LNG plant according to claim 3, characterized in that: A push rod (10) is nested and installed on the surface of the round rod (9), and the shape of the push rod (10) is "T"-shaped, and a filter screen (11) is fixedly installed on the right end of the push rod (10).

5. The mixed refrigerant recovery device of an LNG plant according to claim 4, characterized in that: Limit blocks (12) are fixedly mounted at the upper and lower ends of the filter screen (11), and the limit blocks (12) are connected to the limit grooves (13) in a sliding manner.

6. The mixed refrigerant recovery device of an LNG plant according to claim 1, characterized in that: The indirect connection mechanism is provided with a first airbag (14), and the first airbag (14) is arranged inside the right side of the limiting groove (13), and an air guide tube (15) is fixedly installed on the right side of the first airbag (14), and a second airbag (16) is fixedly installed on the right side of the air guide tube (15), and the right side of the second airbag (16) is fixedly installed on the left side of the protrusion (17), and the first airbag (14) is an elastic airbag.

7. The mixed refrigerant recovery device of an LNG plant according to claim 6, characterized in that: A first magnet (18) is fixedly mounted on the right side of the protrusion (17), a rubber sealing sleeve (19) is fixedly mounted inside the air outlet pipe (5), a second magnet (20) is arranged inside the rubber sealing sleeve (19), the rubber sealing sleeve (19) is made of four pieces of rubber, and the second magnet (20) has opposite magnetic properties to the first magnet (18).

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