Pretreatment device for natural gas liquefaction

Abstract

The utility model relates to the field of natural gas liquefaction, in particular to a pretreatment device for natural gas liquefaction, which comprises a filtering box body, a filtering tank body, a first gas conveying pipe, a water-based solvent filtering tank body, a second gas conveying pipe, a cooling tank body, a sealing plate, a gas inlet and a liquid outlet, the upper side of the filtering tank body is provided with the first gas conveying pipe; the other side of the first gas conveying pipe is connected with the water-based solvent filtering tank body; the right side of the water-based solvent filtering tank body is connected with the second gas conveying pipe; the other side of the second gas conveying pipe is connected with the cooling tank body; a liquid outlet is formed in the lower end of the front side of the cooling tank.

Description

Technical Field

[0001] The utility model relates to the field of natural gas liquefaction, in particular to a pretreatment device for natural gas liquefaction. Background Art

[0002] Liquefied Natural Gas (LNG), whose main component is methane, is recognized as the cleanest energy on earth. It is colorless, odorless, non-toxic and non-corrosive. Its volume is about 1 / 625 of the volume of the same amount of gaseous natural gas, and its weight is only about 45% of the same volume of water. Its manufacturing process is to purify the natural gas produced by the gas field first, and then transport it by liquefied natural gas ship after a series of ultra-low temperature liquefaction. After the combustion of liquefied natural gas, the air pollution is very small, and the heat released is large, so liquefied natural gas is a relatively advanced energy source. Liquefied natural gas is natural gas that has been compressed and cooled to its boiling point (-161.5 degrees Celsius) and then turned into liquid. Usually, liquefied natural gas is stored in a low-temperature storage tank at -161.5 degrees Celsius and about 0.1MPa, and transported by special ships or tank trucks. It is re-gasified when used. A Chinese patent discloses a pretreatment device for natural gas liquefaction (authorization announcement number CN 220788484 U), this patented technology can set the pretreatment filter tank body below the pretreatment cooling tank body, 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, and the upper end surfaces of the pretreatment filter tank body and the pretreatment cooling tank body are correspondingly detachably connected with an upper cover plate A and an upper cover plate B. This design is convenient for the staff to clean and maintain the interior of the pretreatment filter tank body and the pretreatment cooling tank body in the later stage. However, this design only installs two filter plates of the same specification inside the pretreatment filter tank body, and the structure is simple, and it cannot filter dust in a layered manner well. In addition, the untreated natural gas contains impurities such as carbon dioxide, hydrogen sulfide, propane and butane. This design does not have a structure for filtering such impurities, which will cause agglomeration and blockage during the later cooling. Therefore, those skilled in the art provide a pretreatment device for natural gas liquefaction to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a pretreatment device for natural gas liquefaction, including a filter box, a filter tank, a No. 1 gas pipeline, a water-based solvent filter tank, a No. 2 gas pipeline, a cooling tank, a sealing plate, an air inlet and a liquid outlet. The air inlet is installed at the lower end of the left side of the filter box, the sealing plate is installed on the rear side of the filter box, the filter tank is installed on the upper side of the filter box, the No. 1 gas pipeline is connected and installed on the upper side of the filter tank, the other side of the No. 1 gas pipeline is connected and installed with a water-based solvent filter tank, the right side of the water-based solvent filter tank is connected and installed with a No. 2 gas pipeline, the other side of the No. 2 gas pipeline is connected and installed with a cooling tank, and the liquid outlet is installed at the lower end of the front side of the cooling tank.

[0004] Preferably: the filter box has a No. 2 convex plate at the lower end of the inner side, a No. 3 convex plate at the upper end of the No. 2 convex plate, a No. 4 convex plate at the upper end of the No. 3 convex plate, a water storage component between the No. 2 and No. 3 convex plates, a No. 1 porous sponge between the No. 3 and No. 4 convex plates, and a No. 2 porous sponge on the upper side of the No. 4 convex plate;

[0005] Preferably: a groove is provided on the left side of the filter box body, a No. 1 convex plate is installed inside the groove, a plurality of first fixing holes of the same size are provided on the No. 1 convex plate, a No. 2 fixing piece is installed in the first fixing hole, the No. 1 convex plate and the sealing plate are fixedly installed by the No. 2 fixing piece, a No. 5 convex plate is installed on the front side of the sealing plate, a plurality of third fixing holes of the same size are provided on both sides of the No. 5 convex plate, and two No. 6 convex plates of the same specification are installed inside the third fixing holes;

[0006] Preferably: a No. 1 convex ring is installed at the upper end of the inner side of the filter tank body, a plurality of second fixing holes of the same size are arranged on the No. 1 convex ring, a No. 1 fixing piece is installed in the second fixing hole, the No. 1 convex ring, the sealing ring and the fixed disc are fixedly installed by the No. 1 fixing piece, a No. 2 convex ring is installed on the lower side of the sealing ring, a plurality of fourth fixing holes of the same specifications are arranged on the four sides of the sealing ring, a fifth fixing hole of the same specifications is arranged on the four sides of the fixed disc, and a No. 1 gas pipe is connected and installed on the upper side of the fixed disc;

[0007] Preferably, a No. 3 convex ring is installed in the middle position of the inner side of the filter tank body, a No. 4 convex ring is installed at the upper end of the No. 3 convex ring, and a filter plate is installed between the No. 3 convex ring and the No. 4 convex ring.

[0008] Technical effects and advantages of the utility model:

[0009] 1. Some water in natural gas is filtered and absorbed by porous sponge No. 1 and No. 2. When there is too much water in the sponge, it will drip into the water storage part at the bottom. The water storage part can effectively filter the absorbed water to prevent the equipment from being soaked;

[0010] 2. Install the No. 3 convex ring in the middle of the inner side of the filter tank, install the No. 4 convex ring on the upper end of the No. 3 convex ring, and install the filter plate between the No. 3 and No. 4 convex rings. The filter plate can effectively filter fine impurities such as dust to ensure the purity of natural gas;

[0011] 3. By filtering the tank with a water-based solvent, the carbon dioxide and hydrogen sulfide in the natural gas can be dissolved, thus avoiding the problem of blockage caused by agglomeration of these gases during the subsequent cooling of the natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 1 ;

[0013] Figure 2 This is a schematic diagram of a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 2 ;

[0014] Figure 3 This is a schematic diagram of a local explosion structure in a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 1 ;

[0015] Figure 4 This is a schematic diagram of a local explosion structure in a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 2 ;

[0016] Figure 5 This is a schematic diagram of a local explosion structure in a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 3 ;

[0017] Figure 6 This is a schematic diagram of a local explosion structure in a natural gas liquefaction pretreatment device provided in an embodiment of the present application. Figure 4 .

[0018] In the figure: 1, filter box; 2, filter tank; 3, No. 1 gas pipe; 4, water-based solvent filter tank; 5, No. 2 gas pipe; 6, cooling tank; 7, sealing plate; 8, No. 1 fixing piece; 9, No. 2 fixing piece; 101, air inlet; 102, groove; 103, No. 1 convex plate; 104, first fixing hole; 105, No. 2 convex plate; 106, No. 3 convex plate; 107, No. 4 convex plate; 108, water storage piece; 10 9. Porous sponge No. 1; 110. Porous sponge No. 2; 201. Protruding ring No. 1; 202. Second fixing hole; 203. Sealing ring; 204. Protruding ring No. 2; 205. Fourth fixing hole; 206. Protruding ring No. 3; 207. Protruding ring No. 4; 208. Filter plate; 301. Fixed disc; 302. Fifth fixing hole; 601. Liquid outlet; 701. Protruding plate No. 5; 702. Third fixing hole; 703. Protruding plate No. 6. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes. Example

[0020] See also Figure 1 to Figure 6 In this embodiment, a pretreatment device for natural gas liquefaction is provided, including a filter box 1, a filter tank 2, a No. 1 gas pipeline 3, a water-based solvent filter tank 4, a No. 2 gas pipeline 5, a cooling tank 6, a sealing plate 7, an air inlet 101 and a liquid outlet 601. The air inlet 101 is installed at the lower end of the left side of the filter box 1, the sealing plate 7 is installed at the rear side of the filter box 1, the filter tank 2 is installed on the upper side of the filter box 1, the No. 1 gas pipeline 3 is connected to the upper side of the filter tank 2, the other side of the No. 1 gas pipeline 3 is connected to the water-based solvent filter tank 4, the right side of the water-based solvent filter tank 4 is connected to the No. 2 gas pipeline 5, the other side of the No. 2 gas pipeline 5 is connected to the cooling tank 6, and the liquid outlet 601 is installed at the lower end of the front side of the cooling tank 6;

[0021] Specifically, a second convex plate 105 is provided at the lower end of the inner side of the filter housing 1, a third convex plate 106 is provided at the upper end of the second convex plate 105, a fourth convex plate 107 is provided at the upper end of the third convex plate 106, a water storage member 108 is provided between the second convex plate 105 and the third convex plate 106, a first porous sponge 109 is provided between the third convex plate 106 and the fourth convex plate 107, a second porous sponge 110 is provided on the upper side of the fourth convex plate 107, and a groove 102 is provided on the left side of the filter housing 1. A No. 1 convex plate 103 is installed inside the groove 102, and a plurality of first fixing holes 104 of the same size are provided on the No. 1 convex plate 103, and a No. 2 fixing member 9 is installed inside the first fixing hole 104. The No. 1 convex plate 103 and the sealing plate 7 are fixedly installed by the No. 2 fixing member 9, and a No. 5 convex plate 701 is installed on the front side of the sealing plate 7, and a plurality of third fixing holes 702 of the same size are provided on both sides of the No. 5 convex plate 701, and two No. 6 convex plates 703 of the same specifications are installed inside the third fixing holes 702;

[0022] A No. 3 convex ring 206 is installed at the middle position of the inner side of the filter tank body 2, a No. 4 convex ring 207 is installed at the upper end position of the No. 3 convex ring 206, a filter plate 208 is installed between the No. 3 convex ring 206 and the No. 4 convex ring 207, a No. 1 convex ring 201 is installed at the upper end position of the inner side of the filter tank body 2, a No. 1 convex ring 201 is provided with a plurality of second fixing holes 202 of the same size, a No. 1 fixing piece 8 is installed in the second fixing hole 202, the No. 1 convex ring 201, the sealing ring 203 and the fixed disc 301 are fixedly installed by the No. 1 fixing piece 8, a No. 2 convex ring 204 is installed at the lower side of the sealing ring 203, a plurality of fourth fixing holes 205 of the same specifications are provided on four sides of the sealing ring 203, a fifth fixing hole 302 of the same specifications is provided on four sides of the fixed disc 301, and a No. 1 gas pipe 3 is connected and installed on the upper side of the fixed disc 301.

[0023] The working principle of the utility model is:

[0024] In a natural gas liquefaction pretreatment device, natural gas is transported from the air inlet 101 into the filter box 1. Some water contained in the natural gas is filtered and absorbed through the No. 1 porous sponge 109 and the No. 2 porous sponge 110. When there is too much water in the sponge, it will drip into the water storage part 108 at the bottom. The water storage part 108 can effectively filter the absorbed water to avoid water soaking the equipment. The filter plate 208 can effectively filter fine impurities such as dust to ensure the purity of the natural gas. The water-based solvent filtering tank 4 can dissolve the carbon dioxide and hydrogen sulfide in the natural gas to avoid the problem of blockage caused by the agglomeration of these gases during the later cooling of the natural gas. Finally, through the cooling tank 6, the coolant in the condenser absorbs the heat of the natural gas and turns it into transparent, colorless, non-toxic liquefied natural gas, which is transported out through the liquid outlet 601.

[0025] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A pretreatment device for natural gas liquefaction, characterized in that: The invention comprises a filter box (1), a filter tank (2), a first air supply pipe (3), a water-based solvent filter tank (4), a second air supply pipe (5), a cooling tank (6), a sealing plate (7), an air inlet (101) and a liquid outlet (601), wherein the air inlet (101) is installed at the lower end of the left side of the filter box (1), the sealing plate (7) is installed at the rear side of the filter box (1), the filter tank (2) is installed at the upper side of the filter box (1), the first air supply pipe (3) is connected to the upper side of the filter tank (2), the other side of the first air supply pipe (3) is connected to the water-based solvent filter tank (4), the right side of the water-based solvent filter tank (4) is connected to the second air supply pipe (5), the other side of the second air supply pipe (5) is connected to the cooling tank (6), and the liquid outlet (601) is installed at the lower end of the front side of the cooling tank (6).

2. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: The filter housing (1) is provided with a groove (102) on the left side, a first convex plate (103) is installed inside the groove (102), a plurality of first fixing holes (104) of the same size are provided on the first convex plate (103), a second fixing member (9) is installed in the first fixing hole (104), and the first convex plate (103) and the sealing plate (7) are fixedly installed via the second fixing member (9).

3. A pretreatment device for natural gas liquefaction according to claim 1, characterized in that: A No. 5 convex plate (701) is installed on the front side of the sealing plate (7), a plurality of third fixing holes (702) of the same size are provided on both sides of the No. 5 convex plate (701), and two No. 6 convex plates (703) of the same specification are installed inside the third fixing holes (702).

4. A pretreatment device for natural gas liquefaction according to claim 1, characterized in that: A second convex plate (105) is installed at the lower end of the inner side of the filter box (1), a third convex plate (106) is installed at the upper end of the second convex plate (105), a fourth convex plate (107) is installed at the upper end of the third convex plate (106), a water storage member (108) is installed between the second convex plate (105) and the third convex plate (106), a first porous sponge (109) is installed between the third convex plate (106) and the fourth convex plate (107), and a second porous sponge (110) is installed on the upper side of the fourth convex plate (107).

5. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: A third convex ring (206) is installed at the middle position of the inner side of the filtering tank body (2), a fourth convex ring (207) is installed at the upper end of the third convex ring (206), and a filter plate (208) is installed between the third convex ring (206) and the fourth convex ring (207).

6. A natural gas liquefaction pretreatment device according to claim 1, characterized in that: A No. 1 convex ring (201) is installed at the upper end of the inner side of the filter tank body (2); a plurality of second fixing holes (202) of the same size are provided on the No. 1 convex ring (201); a No. 1 fixing member (8) is installed in the second fixing holes (202); and the No. 1 convex ring (201), the sealing ring (203) and the fixing disc (301) are fixedly installed via the No. 1 fixing member (8).

7. A pretreatment device for natural gas liquefaction according to claim 6, characterized in that: A second convex ring (204) is installed on the lower side of the sealing ring (203), and a plurality of fourth fixing holes (205) of the same specification are provided on four sides of the sealing ring (203).

8. A natural gas liquefaction pretreatment device according to claim 6, characterized in that: The fixing disc (301) is provided with fifth fixing holes (302) of the same specification on four sides, and the upper side of the fixing disc (301) is connected to and installed with a No. 1 gas transmission pipe (3).

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