Pretreatment equipment for natural gas liquefaction

Abstract

The utility model discloses pretreatment equipment for natural gas liquefaction, which comprises a primary filter box, a cold filter box and a pure cold box, and the primary filter box, the cold filter box and the pure cold box are connected through flanges. Cooling water enters the bent cold water pipes and the primary cold water pipe from the T-shaped water inlet pipe and then is discharged from the T-shaped water outlet pipe, circulation of the cooling water is achieved, natural gas enters the primary filter box from the gas inlet, impurities are filtered through the primary filter screen, the natural gas enters the cold filter box, finer impurities are filtered through the fine filter screen, and the natural gas enters the pure cold box. At the moment, the primary cold water pipe cools the natural gas in the cold filter box, cooling and filtering are combined, the cooling efficiency is improved, the safety coefficient is increased, the bent cold water pipes cool the natural gas in the pure cold box, then the natural gas is discharged from the gas outlet, and meanwhile the primary filter screen and the fine filter screen are convenient to disassemble and assemble.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas processing equipment, in particular to pre-processing equipment for natural gas liquefaction. Background Art

[0002] Before natural gas is liquefied, it is usually necessary to filter and cool the natural gas. A pretreatment device for natural gas liquefaction with publication number CN220788484U discloses a pretreatment cooling tank and a pretreatment filtering tank, wherein the outer surface of the pretreatment cooling tank is provided with a cooling jacket, and the upper end surface of the pretreatment cooling tank is connected with an upper cover plate B for installing a natural gas outlet pipe, and the pretreatment filtering tank is arranged below the pretreatment cooling tank, and the pretreatment filtering tank and the pretreatment cooling tank are connected by a gas transmission mechanism; the pretreatment filtering tank is arranged below the pretreatment cooling tank, so that the device first performs a filtering process on the natural gas and then completes the cooling process, thereby avoiding the problem of natural gas polluting the cooling device; however, in the patent document, the natural gas with a higher temperature needs to be filtered twice before entering the cooling process, resulting in untimely cooling, and the high-temperature natural gas has a higher pressure and energy. If it leaks and mixes with oxygen in the air to form a combustible mixture, once it encounters an ignition source, it may cause a fire or explosion, especially in a closed or confined space, and the safety factor is low.

[0003] There may already be technical means to solve the above problems in the prior art, but this case intends to provide an alternative or replacement technical solution. Utility Model Content

[0004] In order to solve the problems raised in the background technology, the utility model is implemented through the following technical solutions: a pretreatment device for natural gas liquefaction, comprising a primary filter box, a cold filter box and a pure cold box, wherein the primary filter box, the cold filter box and the pure cold box are connected by flanges;

[0005] A primary filter support ring is installed on the inner wall of the primary filter box, and a primary filter net is installed on the primary filter support ring, a cold filter support ring is installed on the inner side of the cold filter box, and a fine filter net is installed on the cold filter support ring, a primary filter pressure column is installed on the lower wall of the cold filter support ring, and one end of the primary filter pressure column is movably fitted on the primary filter net, a primary cold water pipe is installed around the outer wall of the cold filter box, a fine filter pressure column is installed on the inner top surface of the pure cold box, and one end of the fine filter pressure column is movably fitted on the fine filter net, a plurality of bent cold water pipes are equidistantly penetrated longitudinally on the side wall of the pure cold box, a T-shaped water inlet pipe is installed on one end of the plurality of bent cold water pipes and one end of the primary cold water pipe, and a T-shaped water outlet pipe is installed on the other end of the plurality of bent cold water pipes and the other end of the primary cold water pipe.

[0006] Preferably, an air inlet is inserted on the lower wall surface of the primary filter box, and an air outlet is inserted on the upper wall surface of the pure cold box.

[0007] Preferably, sealing gaskets are installed between the primary filter box, the cold filter box and the pure cold box.

[0008] Preferably, a support column is installed on the lower wall surface of the primary filter box.

[0009] Preferably, the outer wall surface of the cold filter box is covered with a heat-insulating sleeve.

[0010] Preferably, an air collecting hood is installed on the fine filter pressure column, and one end of the air collecting hood is movably fitted on the fine filter net.

[0011] Beneficial Effects

[0012] The utility model provides a pretreatment device for natural gas liquefaction. Compared with the prior art, it has the following beneficial effects: cooling water enters into a plurality of bent cold water pipes and a primary cold water pipe from a T-shaped water inlet pipe, and is then discharged from a T-shaped water outlet pipe, so as to realize the circulation of cooling water; natural gas enters into a primary filter box from an air inlet, enters into a cold filter box after filtering impurities through a primary filter screen, and then enters into a pure cold box after filtering out even finer impurities through a fine filter screen; at this time, the primary cold water pipe cools down the natural gas in the cold filter box, so as to realize the combination of cooling and filtering, improve the cooling efficiency, and improve the safety factor; a plurality of bent cold water pipes cool down the natural gas in the pure cold box, and is then discharged from an air outlet; and at the same time, the primary filter screen and the fine filter screen are easy to disassemble and assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the main cross-sectional structure of a pretreatment device for natural gas liquefaction.

[0014] Figure 2 The utility model is a side structural schematic diagram of a pretreatment device for natural gas liquefaction.

[0015] Figure 3 The utility model is a schematic diagram of a top view and a cross-sectional structure of a pretreatment device for natural gas liquefaction.

[0016] Figure 4 The utility model is a schematic diagram of the top view of the structure of a bent cold water pipe of a pretreatment device for natural gas liquefaction.

[0017] In the figure: 1. primary filter box, 2. cold filter box, 3. pure cold box, 4. primary filter support ring, 5. primary filter screen, 6. cold filter support ring, 7. fine filter screen, 8. primary filter pressure column, 9. primary cold water pipe, 10. bent cold water pipe, 11. air inlet, 12. air outlet, 13. support column, 14. insulation cover, 15. air collecting hood, 16. sealing gasket, 17. T-type water inlet pipe, 18. T-type water outlet pipe, 19. fine filter pressure column. DETAILED DESCRIPTION

[0018] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0019] Example: See Figure 1-4 In order to solve the problem of untimely cooling and high risk factor caused by multiple filtrations of natural gas, this technical solution is designed. The detailed technical solution is as follows;

[0020] A pretreatment device for natural gas liquefaction, comprising a primary filter box 1, a cold filter box 2 and a pure cold box 3, wherein the primary filter box 1, the cold filter box 2 and the pure cold box 3 are connected by flanges;

[0021] Specifically, a primary filter support ring 4 is installed on the inner wall of the primary filter box 1, a primary filter screen 5 is installed on the primary filter support ring 4, a cold filter support ring 6 is installed on the inner side of the cold filter box 2, a fine filter screen 7 is installed on the cold filter support ring 6, a primary filter pressure column 8 is installed on the lower wall of the cold filter support ring 6, one end of the primary filter pressure column 8 is movably attached to the primary filter screen 5, a primary cold water pipe 9 is installed around the outer wall of the cold filter box 2, a fine filter pressure column 19 is installed on the inner top surface of the pure cold box 3, and the fine filter pressure column 19 is installed on the inner top surface of the pure cold box 3. The end is movably attached to the fine filter 7, and a plurality of bent cold water pipes 10 are longitudinally equidistantly penetrated on the side wall of the pure cold box 3, and a T-shaped water inlet pipe 17 is installed at one end of the plurality of bent cold water pipes 10 and one end of the primary cold water pipe 9, and a T-shaped water outlet pipe 18 is installed at the other end of the plurality of bent cold water pipes 10 and the other end of the primary cold water pipe 9; as a preferred embodiment, further, an air inlet 11 is inserted on the lower wall of the primary filter box 1, and an air outlet 12 is inserted on the upper wall of the pure cold box 3;

[0022] It should be noted that the cooling water enters the multiple curved cold water pipes 10 and the primary cold water pipe 9 from the T-shaped water inlet pipe 17, and then is discharged from the T-shaped water outlet pipe 18 to realize the circulation of the cooling water. The natural gas enters the primary filter box 1 from the air inlet 11, passes through the primary filter screen 5 to filter impurities and enters the cold filter box 2, and then passes through the fine filter screen 7 to filter finer impurities and enter the pure cold box 3. At this time, the primary cold water pipe 9 cools the natural gas in the cold filter box 2, realizing the combination of cooling and filtering, improving the cooling efficiency, and improving the safety factor. The multiple curved cold water pipes 10 cool the natural gas in the pure cold box 3, and then it is discharged from the air outlet 12;

[0023] When the primary filter 5 needs to be replaced, the primary filter box 1 is separated from the cold filter box 2. At this time, the primary filter pressure column 8 is separated from the primary filter 5, and the user can replace the primary filter 5. After the new primary filter 5 is placed on the primary filter support ring 4, the primary filter box 1 is connected to the cold filter box 2, and the primary filter pressure column 8 is again attached to the primary filter 5, so that the primary filter 5 is installed and fixed, and the disassembly and assembly are convenient;

[0024] When the fine filter 7 needs to be replaced, the pure cold box 3 is separated from the cold filter box 2. At this time, the fine filter pressure column 19 is detached from the fine filter 7, and the user can replace the fine filter 7. After the new fine filter 7 is placed on the fine filter support ring, the pure cold box 3 is connected to the cold filter box 2, and the fine filter pressure column 19 is again attached to the fine filter 7 to achieve the installation and fixation of the fine filter 7, which is convenient for disassembly and assembly.

[0025] As a preferred embodiment, further, a sealing gasket 16 is installed between the primary filter box 1, the cold filter box 2 and the pure cold box 3 for sealing connection;

[0026] As a preferred embodiment, further, a support column 13 is installed on the lower wall of the primary filter box 1 for supporting the device;

[0027] As a preferred embodiment, further, the outer wall of the cold filter box 2 is provided with an insulation sleeve 14, the primary cold water pipe 9 is located in the insulation sleeve 14, and the end of the primary cold water pipe 9 is inserted into the insulation sleeve 14, and the insulation sleeve 14 is used to insulate the primary cold water pipe 9;

[0028] Preferably, further, a gas collecting hood 15 is installed on the fine filter pressure column 19, and one end of the gas collecting hood 15 is movably fitted on the fine filter screen 7, so that the natural gas is gathered and flows upward, thereby improving the contact efficiency between the natural gas and the multiple bent cold water pipes 10.

[0029] 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 pretreatment device for natural gas liquefaction, comprising a primary filter box (1), a cold filter box (2) and a pure cold box (3), characterized in that: The primary filter box (1), the cold filter box (2) and the pure cold box (3) are connected via flanges; The inner wall surface of the primary filter box (1) is provided with a primary filter support ring (4), and a primary filter screen (5) is installed on the primary filter support ring (4); the inner side of the cold filter box (2) is provided with a cold filter support ring (6), and a fine filter screen (7) is installed on the cold filter support ring (6); a primary filter pressure column (8) is installed on the lower wall surface of the cold filter support ring (6), and one end of the primary filter pressure column (8) is movably attached to the primary filter screen (5); a primary cold water pipe (9) is installed around the outer wall surface of the cold filter box (2); A fine filter pressure column (19) is installed on the inner top surface of the pure cold box (3), and one end of the fine filter pressure column (19) is movably fitted on the fine filter screen (7). A plurality of bent cold water pipes (10) are longitudinally equidistantly penetrated through the side wall of the pure cold box (3), and a T-shaped water inlet pipe (17) is installed at one end of the plurality of bent cold water pipes (10) and one end of the primary cold water pipe (9), and a T-shaped water outlet pipe (18) is installed at the other end of the plurality of bent cold water pipes (10) and the other end of the primary cold water pipe (9).

2. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: An air inlet (11) is inserted on the lower wall surface of the primary filter box (1), and an air outlet (12) is inserted on the upper wall surface of the pure cold box (3).

3. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: Sealing gaskets (16) are installed between the primary filter box (1), the cold filter box (2) and the pure cold box (3).

4. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: A support column (13) is installed on the lower wall surface of the primary filter box (1).

5. The natural gas liquefaction pretreatment equipment according to claim 1, characterized in that: The outer wall surface of the cold filter box (2) is provided with a heat-insulating sleeve (14).

6. The natural gas liquefaction pretreatment equipment according to claim 1, characterized in that: An air collecting hood (15) is installed on the fine filter pressure column (19), and one end of the air collecting hood (15) is movably attached to the fine filter screen (7).

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