Methanation device for preparing synthetic natural gas

Abstract

The utility model discloses a methanation device for preparing synthetic natural gas, which comprises a device shell and a plurality of groups of heat exchange tubes, the plurality of groups of heat exchange tubes are vertically arranged in the device shell and are uniformly distributed in a central symmetry mode, an evaporation chamber and a methane reaction chamber are arranged in the device shell, and the evaporation chamber is communicated with the methane reaction chamber. A sealing partition plate is arranged between the evaporation chamber and the methane reaction chamber, a gas uniform distribution grid is arranged at the lower end in the methane reaction chamber, a ceramic ball layer is arranged above the gas uniform distribution grid, a catalyst bed layer assembly is arranged above the ceramic ball layer, and a plurality of radiating fins are arranged on each group of heat exchange tubes. Compared with the prior art, the methanation device for preparing the synthetic natural gas has the advantages that the bed layers are modularly designed and can be independently disassembled and assembled, a catalyst is convenient to replace and maintain, heat of the methane reaction chamber is transferred to the outside through the radiating fins, the temperature in the methane reaction chamber can be effectively reduced, and the methanation effect is good. The service life of the catalyst is prolonged, and the reactant conversion rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas synthesis, in particular to a methanation device for synthesizing natural gas. Background Art

[0002] A Chinese patent with the publication number CN217962472U discloses a methanation device for synthesizing natural gas, which includes a device housing and heat exchange tubes. The device housing has an evaporation chamber and a methanation reaction chamber connected to each other. The methanation reaction chamber is arranged at the bottom side of the device housing. A catalyst bed layer is arranged in the methanation reaction chamber, and a gas distribution grid is arranged at the bottom side of the methanation reaction chamber. A porcelain ball layer is also filled at the bottom side of the methanation reaction chamber, and the porcelain ball layer is arranged between the gas distribution grid and the catalyst bed layer. There are multiple groups of the heat exchange tubes, and they are vertically arranged in the device housing and evenly distributed in a centrosymmetric manner. The bottom ends of the heat exchange tubes pass through the catalyst bed layer and are inserted into the porcelain ball layer. By setting the heat exchange tubes, the heat generated by the methanation of the device can be taken away in time, the temperature of the catalyst bed layer is homogenized, the overheated area of the catalyst is avoided, the service life of the catalyst is prolonged, and the conversion rate of the reactants is improved.

[0003] However, when the catalyst needs to be replaced or maintained, this device is not convenient enough, has poor flexibility, and cannot perform local maintenance and replacement. Moreover, this device only conducts the heat of the catalyst bed layer upward to the evaporation chamber through the heat exchange tubes, and this conduction process takes a certain amount of time, which results in the heat taken away from the catalyst bed layer not being converted in time, so that the temperature of the entire methanation reaction chamber cannot be effectively reduced in time, thus having an adverse impact on the catalytic reaction of the catalyst. Therefore, we propose a new methanation device for synthesizing natural gas. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a methanation device for synthesizing natural gas, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a methanation device for synthesizing natural gas, which includes a device housing and several groups of heat exchange tubes. The several groups of heat exchange tubes are vertically arranged in the device housing and evenly distributed in a centrosymmetric manner. An evaporation chamber and a methane reaction chamber are arranged in the device housing. A sealing partition is arranged between the evaporation chamber and the methane reaction chamber. A gas distribution grid is arranged at the lower end inside the methane reaction chamber. A porcelain ball layer is arranged above the gas distribution grid. A catalyst bed layer assembly is arranged above the porcelain ball layer. Several heat dissipation fins are fixedly installed on each group of heat exchange tubes.

[0006] As a further description of the above technical solution, the sealing partition is fixedly connected to the inner wall of the device housing, and each of the heat dissipation fins penetrates through the device housing and extends to the outside to transfer the heat of the methane reaction chamber to the outside.

[0007] As a further description of the above technical solution, the bottom end of each of the heat exchange tubes passes through the catalyst bed layer assembly and is inserted into the porcelain ball layer, and the top end of each of the heat exchange tubes passes through the sealing partition and extends into the evaporation chamber. The heat exchange tubes transfer the heat of the methanation reaction to the evaporation chamber, and the evaporation chamber evaporates the medium.

[0008] As a further description of the above technical solution, a flange cover is fixedly connected to the upper end of the evaporation chamber.

[0009] As a further description of the above technical solution, the catalyst bed layer assembly includes a fixed frame. The bottom end of the fixed frame is fixedly connected with a perforated plate. A plurality of bed layers are arranged inside the fixed frame. The center of the top end of the perforated plate is fixedly connected with a fixed column, and a plurality of insertion slots are evenly arranged on the side of the fixed column. Each of the bed layers is fixedly connected with an insertion rod.

[0010] As a further description of the above technical solution, the fixed frame is fixedly connected to the inner wall of the device housing. The bed layer is in a fan-shaped structure and is evenly distributed inside the fixed frame in a centrally symmetric manner. The insertion rod is adapted to the insertion slot and is slidably connected.

[0011] Compared with the prior art, the present utility model has the following beneficial effects:

[0012] 1. By setting the catalyst bed layer assembly, the catalyst bed layer can be modularly designed, and several bed layers can be disassembled and assembled separately, which is convenient for the replacement and maintenance of the catalyst and is more flexible.

[0013] 2. By setting the heat exchange tubes, the gas distribution grille, the porcelain ball layer and the heat dissipation fins in cooperation, the heat generated by the methanation reaction of the device can be taken away in time through the heat exchange tubes, the temperature of the catalyst bed layer is equalized, and the heat dissipated during the methane reaction in the methane reaction chamber can be transferred to the outside of the device housing through the heat dissipation fins, improving the heat exchange efficiency, avoiding the occurrence of overheated areas in the catalyst, extending the service life of the catalyst, and increasing the conversion rate of the reactants. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of a methanation device for producing synthetic natural gas according to the present utility model;

[0015] Figure 2 It is a cross-sectional view of the overall structure of a methanation device for producing synthetic natural gas according to the present utility model;

[0016] Figure 3This is a schematic diagram of the internal structure of a methanation device for producing synthetic natural gas according to the present utility model.

[0017] Figure 4 This is a schematic diagram of the catalyst bed assembly structure of a methanation device for producing synthetic natural gas according to the present utility model.

[0018] In the figure: 1, device housing; 2, heat exchange tube; 3, evaporation chamber; 4, methane reaction chamber; 5, sealing partition; 6, gas distribution grille; 7, porcelain ball layer; 8, catalyst bed assembly; 9, heat dissipation fin; 10, flange cover; 81, fixed frame; 82, mesh plate; 83, bed layer; 84, fixed column; 85, insertion slot; 86, insertion rod. Detailed implementation manners

[0019] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation manners.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] Please refer to Figures 1-3, the present utility model provides a technical solution: a methanation device for synthesizing natural gas, including a device housing 1 and several groups of heat exchange tubes 2. The device housing 1 is made of a high-strength and corrosion-resistant alloy material to ensure stable operation in a high-pressure and high-temperature environment. Several groups of heat exchange tubes 2 are vertically arranged in the device housing 1 and are evenly distributed in a centrosymmetric manner. The heat exchange tubes 2 are filled with a working fluid. An evaporation chamber 3 and a methane reaction chamber 4 are arranged in the device housing 1. A flange cover 10 is fixedly connected to the upper end of the evaporation chamber 3. A sealing partition 5 is arranged between the evaporation chamber 3 and the methane reaction chamber 4. The sealing partition 5 is fixedly connected to the inner wall of the device housing 1, and the two are separated by the sealing partition 5 to ensure the independence of the reaction process. A gas distribution grid 6 is arranged at the lower end inside the methane reaction chamber 4. A porcelain ball layer 7 is arranged above the gas distribution grid 6. A catalyst bed layer assembly 8 is arranged above the porcelain ball layer 7. The bottom end of each heat exchange tube 2 passes through the catalyst bed layer assembly 8 and inserts into the porcelain ball layer 7. The top end of each heat exchange tube 2 passes through the sealing partition 5 and extends into the evaporation chamber 3. The heat exchange tubes 2 transfer the heat of the methanation reaction to the evaporation chamber 3, and the evaporation chamber 3 evaporates the medium. Several heat dissipation fins 9 are fixedly installed on each group of heat exchange tubes 2, and each heat dissipation fin 9 penetrates through the device housing 1 and extends to the outside to transfer the heat of the methane reaction chamber 4 to the outside.

[0023] It should be noted here that a gas inlet is provided at the upper part of the methane reaction chamber 4, and a gas outlet is provided at the lower part. After the feed gas is pretreated, it enters the reaction chamber through the inlet, undergoes a methanation reaction under the action of a catalyst to generate synthetic natural gas, and the reacted gas is discharged from the outlet. After subsequent treatment, a qualified synthetic natural gas product can be obtained; the gas distribution grid 6 is located below the catalyst bed layer assembly 8 and is designed with a porous structure to ensure that the gas can be evenly distributed when passing through, avoiding catalyst deactivation caused by overly strong local reactions. All the contents in this paragraph are a mature and publicly disclosed technology in the prior art, and this technology can be realized by those skilled in the art. Therefore, the specific structure and working principle thereof will not be elaborated in this text.

[0024] The catalyst bed layer assembly 8 includes a fixed frame 81, which is fixedly connected to the inner wall of the device housing 1. A mesh plate 82 is fixedly connected to the bottom end of the fixed frame 81. Several bed layers 83 are arranged inside the fixed frame 81. The bed layers 83 are of a fan-shaped structure and are evenly distributed inside the fixed frame 81 in a centrosymmetric manner. A fixed column 84 is fixedly connected to the center of the top end of the mesh plate 82. Several insertion slots 85 are evenly opened on the side of the fixed column 84. A plugging rod 86 is fixedly connected to each bed layer 83. The plugging rod 86 is adapted to the insertion slot 85 and is slidably connected. It can be seen that the catalyst bed layer of this device adopts a modular design, and several bed layers 83 are separately disassembled and assembled, which is convenient for catalyst replacement and maintenance and is more flexible.

[0025] It should be noted that the present utility model is a methanation device for synthesizing natural gas. Compared with the existing methanation devices for synthesizing natural gas, by modularizing the bed layer design in the present utility model, it can be disassembled and assembled separately, which is convenient for the replacement and maintenance of the catalyst. The heat of the methane reaction chamber is transferred to the outside through the heat dissipation fins, which can effectively reduce the temperature in the methane reaction chamber, extend the service life of the catalyst, and improve the conversion rate of the reactants.

[0026] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A methanation device for producing synthetic natural gas, comprising a device shell (1) and a plurality of groups of heat exchange tubes (2), wherein the plurality of groups of heat exchange tubes (2) are vertically arranged in the device shell (1) and are evenly distributed in a centrally symmetrical manner, characterized in that: An evaporation chamber (3) and a methane reaction chamber (4) are arranged in the housing (1) of the device; a sealing partition (5) is arranged between the evaporation chamber (3) and the methane reaction chamber (4); a gas distribution grid (6) is arranged at the lower end of the interior of the methane reaction chamber (4); a ceramic ball layer (7) is arranged above the gas distribution grid (6); a catalyst bed assembly (8) is arranged above the ceramic ball layer (7); and a plurality of heat dissipation fins (9) are fixedly mounted on each group of the heat exchange tubes (2).

2. A methanation device for producing synthetic natural gas according to claim 1, characterized in that: The sealing baffle (5) is fixedly connected to the inner wall of the device shell (1), and each of the heat dissipation fins (9) penetrates the device shell (1) and extends to the outside, so as to transfer the heat of the methane reaction chamber (4) to the outside.

3. A methanation device for producing synthetic natural gas according to claim 1, characterized in that: The bottom end of each heat exchange tube (2) passes through the catalyst bed assembly (8) and is inserted into the porcelain ball layer (7), and the top end of each heat exchange tube (2) passes through the sealing partition (5) and extends into the evaporation chamber (3). The heat exchange tube (2) transfers the heat of the methanation reaction to the evaporation chamber (3), and the evaporation chamber (3) evaporates the medium.

4. A methanation device for producing synthetic natural gas according to claim 1, characterized in that: The upper end of the evaporation chamber (3) is fixedly connected with a flange cover (10).

5. The methanation device for producing synthetic natural gas according to claim 1, characterized in that: The catalyst bed assembly (8) comprises a fixed frame (81), a mesh plate (82) is fixedly connected to the bottom end of the fixed frame (81), a plurality of bed layers (83) are arranged inside the fixed frame (81), a fixed column (84) is fixedly connected to the center of the top end of the mesh plate (82), a plurality of plug-in grooves (85) are evenly arranged on the side of the fixed column (84), and a plug-in rod (86) is fixedly connected to each of the bed layers (83).

6. A methanation device for producing synthetic natural gas according to claim 5, characterized in that: The fixed frame (81) is fixedly connected to the inner wall of the device housing (1); the bed layer (83) is a fan-shaped structure and is evenly distributed inside the fixed frame (81) in a centrally symmetrical manner; the plug-in rod (86) is matched with the plug-in slot (85) and is slidably connected.

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