CN-121988231-A - Methanation reactor

CN121988231ACN 121988231 ACN121988231 ACN 121988231ACN-121988231-A

Abstract

The invention provides a methanation reactor which can homogenize gas flow and maintain high methane conversion rate even when density unevenness occurs in a catalyst. A methanation reactor comprises a plurality of tubes in a housing, a heat medium disposed in the tubes, and a methanation catalyst disposed between the tubes, wherein a raw material gas passes through the methanation catalyst disposed between the tubes to produce methane. The methanation catalyst disposed between the tubes may be disposed in a state of being continuously connected in the housing. The heat medium can flow in the plurality of tubes and between the outer case and the inner case.

Inventors

NONAKA HIROKI

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260508
Application Date: 20251031
Priority Date: 20241108

Claims (4)

1. A methanation reactor is characterized in that, The housing is provided with a plurality of tubes, a heat medium disposed in the tubes, and a methanation catalyst disposed between the tubes, The raw material gas passes through the methanation catalyst disposed between the tubes to generate methane.
2. The methanation reactor according to claim 1, wherein, The methanation catalyst disposed between the tubes may be disposed in a state of being continuously connected in the housing.
3. Methanation reactor according to claim 1 or 2, characterized in that, The heat medium flows in the plurality of tubes and between the outer case and the inner case.
4. Methanation reactor according to claim 1 or 2, characterized in that, The cross-sectional shape perpendicular to the axial direction of the portion of the tube in contact with the methanation catalyst is a triangle or a quadrangle.

Description

Methanation reactor Technical Field The invention relates to a methanation reactor. Background Patent document 1 discloses a methanation reactor in which a Ni-based catalyst is filled in a shell side of a vertical shell-and-tube heat exchanger, and a raw material gas containing H 2、CO、CO2、H2 O as a main component is introduced into a catalyst filling portion to cause a methanation reaction. Patent document 1 Japanese patent laid-open publication No. 2003-321400 Disclosure of Invention If density unevenness occurs in the catalyst state in each reaction tube, there is a case where a difference occurs in the gas flow of each reaction tube, resulting in a decrease in methane conversion rate. The present invention has been made in view of the above problems, and an object of the present invention is to provide a methanation reactor capable of homogenizing gas flow and maintaining a high methane conversion rate even when density unevenness occurs in a catalyst. One aspect for achieving the above object is a methanation reactor comprising a plurality of tubes in a housing, a heat medium disposed in the tubes, and a methanation catalyst disposed between the tubes, wherein a raw material gas is passed through the methanation catalyst disposed between the tubes to produce methane. In the methanation reactor according to the present invention, the methanation catalyst is not filled in each tube, but is disposed between the tubes (for example, in a continuously connected state). The raw material gas passes through the methanation catalyst to cause a methanation reaction (methanation reaction), and a produced gas (methane) is produced. Therefore, compared with the case where the methanation catalyst is packed in the pipe, even when density unevenness occurs in the catalyst, the gas flow can be made uniform, and the catalyst life can be prolonged without reducing the methane conversion rate. Effects of the invention According to the present invention, it is possible to provide a methanation reactor capable of homogenizing the gas flow and maintaining a high methane conversion rate even when density unevenness occurs in the catalyst. Drawings FIG. 1 is a view for explaining an example of a methanation reactor according to the present embodiment. FIG. 2 is a view for explaining an example of a conventional methanation reactor. FIG. 3 is a view for explaining the shape of a tube in the methanation reactor according to the present embodiment. FIG. 4 is a view for explaining another example of the methanation reactor according to the present embodiment. FIG. 5 is a view for explaining still another example of the methanation reactor according to the present embodiment. Detailed Description Hereinafter, a specific embodiment to which the present invention is applied will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments. The following description and drawings are simplified as appropriate for clarity of explanation. Fig. 1, 4 and 5 are diagrams for explaining various examples of the methanation reactor according to the present embodiment. FIG. 2 is a view for explaining an example of a conventional methanation reactor. Fig. 3 is a diagram for explaining the shape of the tube in the methanation reactor according to the present embodiment. As shown in fig. 2, the methanation reactor for synthesizing a product gas (methane CH 4) from a raw material gas (for example, carbon dioxide CO 2 and hydrogen H 2) by a methanation reaction (methanation reaction) has a plurality of tubes (6) (reaction tubes) in a housing 7. The methanation reaction is an exothermic reaction that generates a large amount of heat, which is represented by the chemical reaction formula of "(raw material gas) CO 2+4H2 = (production gas) CH 4+2H2 o+165 kJ". Therefore, in the methanation reaction, there is a peak reaction temperature, and if the temperature of the catalyst environment in the reaction system is too low, the catalyst may be deactivated, and if the temperature is too high, the methanation reaction may be deactivated or the catalyst may be thermally degraded. Therefore, it is known that the methanation reaction requires heat control with a heat medium or the like to maintain the temperature of the methanation catalyst at an appropriate temperature. Furthermore, it is known that the reaction amount of methanation reaction depends on the amount of raw material gas. FIG. 2 (a-1) is a schematic cross-sectional view of a conventional methanation reactor cut in parallel in the axial direction (the gas flow direction of the housing), and FIG. 2 (a-2) is a schematic cross-sectional view of the methanation reactor cut perpendicularly in the axial direction. In the methanation reactor shown in fig. 2, a plurality of reaction tubes 6 disposed in a casing 7 which is a substantially cylindrical container are filled with a methanation catalyst 2, and a heat medium 1 (hot fluid) of a fluid such as