Nickel catalyst recovery structure and nickel catalyst recovery method

Abstract

The present invention addresses the problem of providing a nickel catalyst recovery structure and a nickel catalyst recovery method capable of efficiently recovering a nickel catalyst. A nickel catalyst recovery structure according to the present invention is provided with: a nickel catalyst adsorption path into which condensed water containing a nickel catalyst flows from a condensed water tank that stores the condensed water, and which adsorbs the nickel catalyst to a bottom surface by means of a magnet attached to the bottom surface; a condensate water discharge path for discharging the condensate water passing through the nickel catalyst adsorption path; a push-out gas path for feeding a push-out gas into the nickel catalyst adsorption path; a nickel catalyst recovery path through which the nickel catalyst pushed out from the bottom surface by the push-out gas passes; and a nickel catalyst recovery tank for recovering the nickel catalyst passing through the nickel catalyst recovery path.

Description

Technical Field

[0001] This invention relates to a nickel catalyst recovery structure and a nickel catalyst recovery method. Background Technology

[0002] In recent years, a technology related to methanation has been developed, which generates methane gas by recovering carbon dioxide gas emitted from the plant and reacting it with hydrogen, allowing it to be reused as fuel. Nickel catalysts are sometimes used in methanation. Due to the high cost of nickel catalysts, recycling and reuse are preferred.

[0003] For example, Patent Document 1 discloses a technique in which magnets are arranged on the outside of a path through which condensate containing a nickel catalyst passes, and the condensate flows in the path, thereby adsorbing the nickel catalyst onto the inner wall of the path.

[0004] Patent Document 1: Japanese Patent Application Publication No. 06-170245 Summary of the Invention

[0005] The inventors have discovered the following issues regarding the structure and method for recovering nickel catalysts.

[0006] In the technology disclosed in Patent Document 1, the nickel catalyst is adsorbed onto the inner wall while the condensate containing the nickel catalyst is flowing. Therefore, there is a risk that the force of the magnet adsorbing the nickel catalyst is counteracted by the force of the flowing condensate, resulting in insufficient adsorption of the nickel catalyst. Furthermore, there is a risk that the magnetic force is weak in the central part of the path because it is far from the magnet, making it difficult to adsorb the nickel catalyst passing through the central part of the path.

[0007] The present invention was made in view of this problem, and its purpose is to provide a nickel catalyst recovery structure and a nickel catalyst recovery method that can efficiently recover nickel catalysts.

[0008] One way to achieve the above objective is a nickel catalyst recovery structure that recovers the nickel catalyst from the condensate generated during methanation in a nickel catalyst methanation reactor, said nickel catalyst recovery structure comprising:

[0009] A nickel catalyst adsorption path is provided in which condensate containing nickel catalyst flows in from a condensate tank storing the condensate, and the nickel catalyst is adsorbed onto the bottom surface by a magnet mounted on the bottom surface.

[0010] A condensate discharge path that discharges the condensate that has passed through the nickel catalyst adsorption path;

[0011] An exhaust gas path is provided, which introduces exhaust gas into the nickel catalyst adsorption path;

[0012] A nickel catalyst recovery path through which the nickel catalyst ejected from the bottom surface by the ejected gas passes; and

[0013] A nickel catalyst recovery tank that recovers the nickel catalyst that has passed through the nickel catalyst recovery path.

[0014] One way to achieve the above objective is a nickel catalyst recovery method, which recovers the nickel catalyst from the condensate generated during methanation in a nickel catalyst methanation reactor, the nickel catalyst recovery method comprising:

[0015] The nickel catalyst is adsorbed onto the bottom surface by allowing condensate containing the nickel catalyst to flow from a condensate tank storing the condensate into a nickel catalyst adsorption path on which a magnet is installed at the bottom surface.

[0016] The condensate that has passed through the nickel catalyst adsorption path is discharged from the condensate discharge path;

[0017] Push gas is fed from the push gas path into the nickel catalyst adsorption path; and

[0018] The nickel catalyst that is pushed out of the bottom surface by the gas is recovered into the nickel catalyst recovery tank via the nickel catalyst recovery path.

[0019] Invention Effects

[0020] According to the present invention, a nickel catalyst recovery structure and a nickel catalyst recovery method that can efficiently recover nickel catalysts can be provided. Attached Figure Description

[0021] Figure 1 This is a block diagram representing the outline of a carbon recycling system.

[0022] Figure 2 This is a schematic cross-sectional view showing an example of the structure of a methanation reactor.

[0023] Figure 3 This is a schematic cross-sectional view of the nickel catalyst recovery structure involved in the implementation method.

[0024] Figure 4 This is a schematic cross-sectional view of the nickel catalyst recovery structure involved in the implementation of the nickel catalyst adsorption method.

[0025] Figure 5 This is a schematic cross-sectional view of the nickel catalyst recovery structure involved in the implementation method during drainage.

[0026] Figure 6 This is a schematic cross-sectional view of the nickel catalyst recovery structure involved in the implementation method of recovering nickel catalyst. Detailed Implementation

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding elements are labeled with the same symbols, and repeated descriptions are omitted as needed for clarity. Furthermore, for ease of understanding, the dimensions of the parts in the drawings may sometimes differ from the actual dimensions.

[0028] First, refer to Figure 1 The carbon reuse system 10 using the nickel catalyst recovery structure 130 described in the embodiment will be explained in general. The carbon reuse system 10 is a system for recovering carbon dioxide contained in exhaust gases emitted from a factory to generate methane gas, and for reusing this methane gas as fuel in the factory. Figure 1 As shown, the carbon recycling system 10 includes a methanation reactor 100, a plant 200, and a carbon dioxide recovery machine 300.

[0029] Factory 200 uses methane gas as fuel for manufacturing and processing factory products such as parts and equipment. Factory 200 discharges waste gas containing carbon dioxide, produced during the combustion of methane. A carbon dioxide recovery unit 300 recovers carbon dioxide from the waste gas discharged from factory 200. The carbon dioxide recovery unit 300 transports the recovered carbon dioxide to a methanation reactor 100. The method of carbon dioxide recovery by the carbon dioxide recovery unit 300 is not particularly limited and is carried out using existing technology. The methanation reactor 100 adds hydrogen to the carbon dioxide received from the carbon dioxide recovery unit 300 to generate methane gas. The methanation reactor 100 transports the generated methane gas to factory 200. Factory 200 uses the methane gas received from the methanation reactor 100 as fuel. Thus, the carbon reuse system 10 is a system for reusing the carbon contained in the carbon dioxide discharged from factory 200 as methane gas.

[0030] Next, refer to Figure 2 The structure of the methanation reactor 100 will be described below. A nickel catalyst 110 is disposed within the methanation reactor 100. The nickel catalyst 110 catalyzes the reaction from carbon dioxide and hydrogen to methane gas. If carbon dioxide and hydrogen are introduced into the methanation reactor 100, methane gas and water (H2O) are produced through methanation. The generated methane gas and water are transported to a condensate tank 120 connected to the methanation reactor 100. The water becomes liquid during transport to the condensate tank 120 and is stored therein. The methane gas is transported from the condensate tank 120 to the plant 200 and used as fuel. Hereinafter, the water stored in the condensate tank 120 will sometimes be referred to as condensate 121. The condensate 121 contains a portion of the pulverized nickel catalyst 122 from the nickel catalyst 110. Since the nickel catalyst 122 contains expensive nickel, it is preferable to recover and reuse it as much as possible.

[0031] Next, refer to Figure 3 The structural example of nickel catalyst recovery structure 130 is described below. Figure 3 In addition to the nickel catalyst recovery structure 130, a condensate tank 120 is also illustrated. The nickel catalyst recovery structure 130 is connected to the condensate tank 120 and recovers the nickel catalyst from the condensate containing the nickel catalyst. The nickel catalyst recovery structure 130 includes a nickel catalyst adsorption path 140, a condensate discharge path 150, a gas exhaust path 160, a nickel catalyst recovery path 170, and a nickel catalyst recovery box 180.

[0032] The nickel catalyst adsorption path 140 is connected to the condensate tank 120, and a magnet 141 is disposed on the outer side of its bottom surface. The magnet 141 is not particularly limited as long as it is a magnet capable of altering the magnetic force within the nickel catalyst adsorption path 140. For example, the magnet 141 can be an electromagnet. Furthermore, the magnet 141 can be a movable permanent magnet. The nickel catalyst adsorption path 140 can adsorb the nickel catalyst contained in the condensate 121 onto its bottom surface using the magnetic force of the magnet 141, and only discharge the condensate 121. A valve 143 is disposed within the nickel catalyst adsorption path 140. The valve 143 is located near the end connected to the condensate tank 120.

[0033] A condensate drain path 150 is connected to the end of the nickel catalyst adsorption path 140 that is not connected to the condensate tank 120. The condensate 121, which has adsorbed the nickel catalyst through the nickel catalyst adsorption path 140, is discharged from the condensate drain path 150. A valve 153 is provided in the middle of the condensate drain path 150.

[0034] A venting gas path 160 is connected near the end of the nickel catalyst adsorption path 140 that is connected to the condensate tank 120. The venting gas path 160 is a path for supplying venting gas toward the nickel catalyst adsorption path 140. The venting gas is, for example, an inert gas. A valve 163 is disposed midway through the venting gas path 160. The nickel catalyst adsorbed on the bottom surface of the nickel catalyst adsorption path 140 is vented by the venting gas supplied from the venting gas path 160.

[0035] A nickel catalyst recovery path 170 is connected near the end of the nickel catalyst adsorption path 140 that connects to the condensate discharge path 150. A nickel catalyst recovery tank 180 is connected to the other end of the nickel catalyst recovery path 170. A valve 173 is disposed in the middle of the nickel catalyst recovery path 170. The nickel catalyst ejected by the expulsion gas is recovered into the nickel catalyst recovery tank 180 through the nickel catalyst recovery path 170.

[0036] Next, refer to Figures 4-6The operation of the nickel catalyst recovery structure 130 is described in detail. When recovering the nickel catalyst contained in the condensate 121, firstly, as... Figure 4 As shown, with valves 153, 163, and 173 closed, valve 143 is opened to allow condensate 121 containing nickel catalyst 122 to flow into the nickel catalyst adsorption path 140. If magnet 141 is an electromagnet, the electromagnet is switched on when condensate 121 containing nickel catalyst 122 flows into the nickel catalyst adsorption path 140. Furthermore, if magnet 141 is a permanent magnet, it is positioned near the outer bottom surface of the nickel catalyst adsorption path 140 when condensate 121 containing nickel catalyst 122 flows into the nickel catalyst adsorption path 140. The nickel catalyst 122 contained in the condensate 121 sinks to the bottom surface of the nickel catalyst adsorption path 140 and is adsorbed by the magnetic force of magnet 141.

[0037] After the nickel catalyst 122 contained in the condensate 121 is adsorbed onto the bottom surface of the nickel catalyst adsorption path 140, as... Figure 5 As shown, valve 143 is closed and valve 153 is opened to drain condensate 121 from condensate drain path 150. If magnet 141 is an electromagnet, after draining condensate 121 from condensate drain path 150, the electromagnet switch is turned off. If magnet 141 is a permanent magnet, after draining condensate 121 from condensate drain path 150, magnet 141 is moved away from the outer bottom surface of nickel catalyst adsorption path 140. Then, as... Figure 6 As shown, valves 163 and 173 are opened, and the nickel catalyst 122 is pushed out from the bottom of the nickel catalyst adsorption path 140 by the gas and recycled into the nickel catalyst recovery tank 180.

[0038] Because the nickel catalyst 122 is adsorbed by sinking to the bottom surface through the nickel catalyst adsorption path 140, the nickel catalyst 122 can be adsorbed efficiently. Therefore, the nickel catalyst recovery structure 130 can efficiently recover the nickel catalyst 122 contained in the condensate 121. Furthermore, the nickel catalyst recovery structure 130 does not require a filter for recovering the nickel catalyst 122.

[0039] Furthermore, the present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the spirit of the invention.

[0040] Symbol Explanation

[0041] 10 - Carbon recycling system, 100 - Methanation reactor, 110 - Nickel catalyst, 120 - Condensate tank, 121 - Condensate, 122 - Nickel catalyst, 130 - Nickel catalyst recovery structure, 140 - Nickel catalyst adsorption path, 141 - Magnet, 143, 153, 163, 173 - Valves, 150 - Condensate discharge path, 160 - Gas exhaust path, 170 - Nickel catalyst recovery path, 180 - Nickel catalyst recovery box, 200 - Plant, 300 - Carbon dioxide recovery machine.

Claims

1. A nickel catalyst recovery structure, characterized in that, The nickel catalyst is recovered from the condensate generated during methanation in a nickel-catalyst methanation reactor, wherein the nickel catalyst recovery structure comprises: A nickel catalyst adsorption path is provided in which condensate containing nickel catalyst flows in from a condensate tank storing the condensate, and the nickel catalyst is adsorbed onto the bottom surface by a magnet mounted on the bottom surface. A condensate discharge path that discharges the condensate that has passed through the nickel catalyst adsorption path; An exhaust gas path is provided, which introduces exhaust gas into the nickel catalyst adsorption path; A nickel catalyst recovery path through which the nickel catalyst ejected from the bottom surface by the ejected gas passes; and A nickel catalyst recovery tank that recovers the nickel catalyst that has passed through the nickel catalyst recovery path.

2. A method for recovering nickel catalyst, characterized in that, The nickel catalyst is recovered from the condensate generated during methanation in a nickel-catalyst methanation reactor, the nickel catalyst recovery method comprising: The nickel catalyst is adsorbed onto the bottom surface by allowing condensate containing the nickel catalyst to flow from a condensate tank storing the condensate into a nickel catalyst adsorption path on which a magnet is installed at the bottom surface. The condensate that has passed through the nickel catalyst adsorption path is discharged from the condensate discharge path; Push gas is fed from the push gas path into the nickel catalyst adsorption path; and The nickel catalyst that is pushed out of the bottom surface by the gas is recovered into the nickel catalyst recovery tank via the nickel catalyst recovery path.

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