Second-order mixed refrigeration natural gas liquefaction device

Abstract

The utility model discloses a second-order mixed refrigeration natural gas liquefaction device which comprises a square cylinder, a top cover is arranged at the top of the square cylinder, a plurality of cold liquid inlet pipes are arranged on one side of the top of a snakelike cavity plate, and a plurality of cold liquid outlet pipes are arranged on one side of the bottom of the snakelike cavity plate. The sealing rings of the odd layers of the snakelike cavity plates are arranged on the side away from the natural gas inlet pipe, the sealing rings of the even layers of the snakelike cavity plates are arranged on the side close to the natural gas inlet pipe, and a plurality of natural gas outlet pipes are arranged on the side wall of the square cylinder. The utility model relates to the technical field of natural gas, refrigerant fluid flows downwards layer by layer in a snakelike cavity plate through a cold fluid inlet pipe, natural gas flows to the lower part of the snakelike cavity plate layer by layer in a snakelike shape through a sealing ring, and pre-refrigeration of the natural gas is realized by arranging a crossed flow cavity. The flowing paths of the natural gas and the refrigerant fluid are roughly the same, and then uniform pre-refrigeration of the natural gas is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas, in particular to a two-stage mixed refrigeration natural gas liquefaction device. Background Art

[0002] As a clean fuel, liquefied natural gas has been widely used in the fields of industry, civil use, and automobile fuel. At present, many areas without natural gas resources are preparing to use liquefied natural gas to solve industrial, civil, and automobile fuel problems. Therefore, the liquefaction of natural gas has become the primary problem that needs to be solved. At present, when natural gas is refrigerated and liquefied, pre-refrigeration is used for preliminary refrigeration, so that the gas pressure can be stabilized during rapid refrigeration, avoiding the burden of increasing the pressure in the circulation pipeline. However, pre-refrigeration uses an arc flow channel, which makes the natural gas rotate and flow downward in the arc flow channel. This arc flow channel will cause the flow path of natural gas to be different, which will lead to uneven pre-refrigeration of natural gas. To this end, we propose a two-stage mixed refrigeration natural gas liquefaction device to solve the above problems. Utility Model Content

[0003] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the utility model proposes a two-stage mixed refrigeration natural gas liquefaction device, comprising a square cylinder, a top cover is arranged on the top of the square cylinder, a serpentine cavity plate is arranged in the inner cavity of the square cylinder, a plurality of cold liquid inlet pipes are arranged on one side of the top of the serpentine cavity plate, the cold liquid inlet pipes penetrate the top cover, a plurality of cold liquid outlet pipes are arranged on one side of the bottom of the serpentine cavity plate, the cold liquid outlet pipes penetrate the side wall of the square cylinder;

[0004] A plurality of natural gas inlet pipes are arranged on the side of the top cover adjacent to the cold liquid inlet pipe, a sealing ring is arranged inside each cavity of the serpentine cavity plate, the sealing rings of the odd-numbered layers of the serpentine cavity plate are arranged on the side away from the natural gas inlet pipe, and the sealing rings of the even-numbered layers of the serpentine cavity plate are arranged on the side close to the natural gas inlet pipe, and a plurality of natural gas outlet pipes are arranged on the side wall of the square cylinder.

[0005] Preferably, the bottom of the inner cavity of the square tube is processed with a slope, and the lower end of the slope is close to one side of the natural gas outlet pipe.

[0006] Preferably, legs for supporting the serpentine cavity plate are provided at four corners of the bottom of the inner cavity of the square tube.

[0007] Preferably, the top cover and the square cylinder are fixedly connected via a flange.

[0008] The beneficial technical effect of the utility model is as follows: the refrigerant flows downward layer by layer in the serpentine cavity plate through the cold liquid inlet pipe and is discharged at the cold liquid outlet pipe, and the natural gas flows in a serpentine shape layer by layer to the bottom of the serpentine cavity plate through the sealing ring until it flows to the bottom of the square cylinder and is discharged at the natural gas outlet pipe. By setting a cross-type flow cavity, pre-cooling of the natural gas is achieved. This refrigeration method replaces the original disc-type refrigeration cavity, so that the flow paths of the natural gas and the refrigerant are roughly the same, thereby achieving uniform pre-cooling of the natural gas, which has certain practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A three-dimensional structural schematic diagram of the utility model is shown.

[0010] Figure 2 The utility model is shown in a disassembled structural schematic diagram.

[0011] Figure 3 The cross-sectional structure diagram of the square tube of the utility model is shown.

[0012] Figure numerals: 1, square cylinder; 2, top cover; 3, serpentine cavity plate; 4, cold liquid inlet pipe; 5, cold liquid outlet pipe; 6, natural gas inlet pipe; 7, sealing ring; 8, natural gas outlet pipe; 9, support leg. DETAILED DESCRIPTION

[0013] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0014] The utility model proposes a two-stage mixed refrigeration natural gas liquefaction device, comprising a square cylinder 1, a top cover 2 is arranged on the top of the square cylinder 1, a serpentine cavity plate 3 is arranged in the inner cavity of the square cylinder 1, a sealing treatment is performed between the serpentine cavity plate 3 and the square cylinder 1, so that the gap between the serpentine cavity plate 3 and the square cylinder 1 is closed, and the serpentine cavity plate 3 is a serpentine cavity channel formed by connecting a plurality of cavity plates, so that the interior thereof can be used for the flow of refrigerant, a plurality of cold liquid inlet pipes 4 are arranged on one side of the top of the serpentine cavity plate 3, the cold liquid inlet pipes 4 penetrate the top cover 2, the cold liquid inlet pipes 4 are connected to the refrigerant pump through a four-way pipe, and then the refrigerant is transported to the serpentine cavity plate 3, and the refrigerant flows downward layer by layer in the serpentine cavity plate 3, a plurality of cold liquid outlet pipes 5 are arranged on one side of the bottom of the serpentine cavity plate 3, the cold liquid outlet pipes 5 penetrate the side wall of the square cylinder 1, the refrigerant flowing downward is discharged at the cold liquid outlet pipe 5, and the refrigerant discharged from the cold liquid outlet pipe 5 can be recovered by a collecting box to realize recycling;

[0015] A plurality of natural gas inlet pipes 6 are arranged on one side of the top cover 2 adjacent to the cold liquid inlet pipe 4. The natural gas inlet pipe 6 is connected to the natural gas pump through a four-way pipe to transport natural gas to the gap between the top cover 2 and the serpentine cavity plate 3. A sealing ring 7 is arranged inside each layer of the cavity of the serpentine cavity plate 3. The sealing ring 7 can penetrate and open the single-layer cavity of the serpentine cavity plate 3, so that the natural gas can flow in a serpentine shape on the outer wall of the serpentine cavity plate 3. The sealing rings 7 of the odd-numbered layers of the serpentine cavity plate 3 are arranged on the side away from the natural gas inlet pipe 6, and the sealing rings 7 of the even-numbered layers of the serpentine cavity plate 3 are arranged on the side close to the natural gas inlet pipe 6. The natural gas flows downward layer by layer in a serpentine shape through the sealing ring 7 until it flows to the bottom of the square cylinder 1, so that the refrigerant and the natural gas can cross and flow in the square cylinder 1, thereby realizing pre-cooling of the natural gas. A plurality of natural gas outlet pipes 8 are arranged on the side wall of the square cylinder 1, and finally the pre-cooled natural gas is discharged at the natural gas outlet pipe 8.

[0016] Specifically, a slope is processed on the bottom of the inner cavity of the square tube 1, and the lower end of the slope is close to the side of the natural gas outlet pipe 8. The slope can facilitate the natural gas to flow to the side of the natural gas outlet pipe 8 and be discharged.

[0017] Specifically, legs 9 for supporting the serpentine cavity plate 3 are provided at the four corners of the bottom of the inner cavity of the square tube 1. The design purpose is to facilitate the setting of the height of the serpentine cavity plate 3, so that there is a gap between the serpentine cavity plate 3 and the bottom surface of the square tube 1 and between the serpentine cavity plate 3 and the bottom surface of the top cover 2 for the flow of natural gas.

[0018] Specifically, the top cover 2 and the square tube 1 are fixedly connected via a flange. This connection method can facilitate the disassembly of the top cover 2, and further facilitate the cleaning and maintenance of the internal serpentine cavity plate 3.

[0019] Working principle: When the liquefaction device is in use, the user can connect the cold liquid inlet pipe 4 to the refrigerant pump through a four-way pipe, and then transport the refrigerant to the serpentine cavity plate 3. The refrigerant flows downward layer by layer in the serpentine cavity plate 3 and is discharged at the cold liquid outlet pipe 5. At the same time, the natural gas inlet pipe 6 is connected to the natural gas pump through a four-way pipe to transport the natural gas to the gap between the top cover 2 and the serpentine cavity plate 3. Then the natural gas flows downward layer by layer in a serpentine shape through the sealing ring 7 until it flows to the bottom of the square tube 1 and is discharged at the natural gas outlet pipe 8, thereby realizing pre-cooling of the natural gas. This refrigeration method replaces the original disc-type refrigeration cavity, so that the flow paths of the natural gas and the refrigerant are roughly the same, and there will be no situation where the natural gas flow path on one side is long and the natural gas flow path on the other side is short, thereby realizing uniform pre-cooling of the natural gas.

[0020] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0021] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0022] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0023] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0024] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A two-stage mixed refrigeration natural gas liquefaction device, comprising a square cylinder (1), characterized in that: A top cover (2) is arranged on the top of the square cylinder (1), a serpentine cavity plate (3) is arranged in the inner cavity of the square cylinder (1), a plurality of cold liquid inlet pipes (4) are arranged on one side of the top of the serpentine cavity plate (3), the cold liquid inlet pipes (4) penetrate the top cover (2), a plurality of cold liquid outlet pipes (5) are arranged on one side of the bottom of the serpentine cavity plate (3), the cold liquid outlet pipes (5) penetrate the side wall of the square cylinder (1); A plurality of natural gas inlet pipes (6) are arranged on a side of the top cover (2) adjacent to the cold liquid inlet pipe (4), a sealing ring (7) is arranged inside each layer of the cavity of the serpentine cavity plate (3), the sealing rings (7) of the odd-numbered layers of the serpentine cavity plate (3) are arranged on a side away from the natural gas inlet pipe (6), and the sealing rings (7) of the even-numbered layers of the serpentine cavity plate (3) are arranged on a side close to the natural gas inlet pipe (6), and a plurality of natural gas outlet pipes (8) are arranged on the side wall of the square cylinder (1).

2. A two-stage mixed refrigeration natural gas liquefaction device according to claim 1, characterized in that: The bottom of the inner cavity of the square cylinder (1) is processed with a slope, and the lower end of the slope is close to one side of the natural gas outlet pipe (8).

3. A two-stage mixed refrigeration natural gas liquefaction device according to claim 1, characterized in that: Support legs (9) for supporting the serpentine cavity plate (3) are provided at the four corners of the bottom of the inner cavity of the square tube (1).

4. A two-stage mixed refrigeration natural gas liquefaction device according to claim 1, characterized in that: The top cover (2) and the square cylinder (1) are fixedly connected via a flange.

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