Nickel catalyst recovery structure and nickel catalyst recovery method

Abstract

The present invention provides a nickel catalyst recovery structure and a nickel catalyst recovery method that can efficiently recover nickel catalysts. [Solution] The nickel catalyst recovery structure 130 according to the present disclosure includes a nickel catalyst adsorption path 140 through which condensed water 121 containing nickel catalyst 122 is poured from a condensed water tank 120 that stores condensed water 121, and through which the nickel catalyst 122 is adsorbed to the bottom surface by a magnet 141 attached to the bottom surface; a condensed water drain path 150 for draining the condensed water 121 that has passed through the nickel catalyst adsorption path 140; an extrusion gas path 160 for supplying extrusion gas to the nickel catalyst adsorption path 140; a nickel catalyst recovery path 170 through which the nickel catalyst 122 extruded from the bottom surface by the extrusion gas passes; and a nickel catalyst recovery box 180 for recovering the nickel catalyst 122 that has passed through the nickel catalyst recovery path 170.

Description

Technical Field

[0001] The present disclosure relates to a nickel catalyst recovery structure and a nickel catalyst recovery method.

Background Art

[0002] In recent years, technologies for methanation, which involves recovering carbon dioxide gas exhausted from factories and reacting it with hydrogen gas to produce methane gas for reuse as fuel, have been developed. Nickel catalysts may be used in methanation. Since nickel catalysts are expensive, it is preferable to recover and reuse them. For example, Patent Document 1 discloses a technique in which a magnet is disposed outside a path through which condensed water containing a nickel catalyst flows, and the nickel catalyst is adsorbed to the inner wall of the path by flowing the condensed water through the path.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors have found the following problems regarding the nickel catalyst recovery structure and the nickel catalyst recovery method. In the technique disclosed in Patent Document 1, the nickel catalyst is adsorbed to the inner wall while the condensed water containing the nickel catalyst is flowing. Therefore, there is a risk that the force of adsorbing the nickel catalyst by the magnet will be overcome by the force of the flowing condensed water, and the nickel catalyst cannot be sufficiently adsorbed. In addition, since the central portion of the path is far from the magnet, the magnetic force is weak, and there is a risk that it is difficult to adsorb the nickel catalyst passing through the central portion of the path.

[0005] This disclosure has been made in view of these challenges and aims to provide a nickel catalyst recovery structure and a nickel catalyst recovery method that can efficiently recover nickel catalysts. [Means for solving the problem]

[0006] One embodiment for achieving the above objective is: A nickel catalyst recovery structure for recovering a nickel catalyst from condensate generated in methanation using a nickel catalyst methanation reactor, A nickel catalyst adsorption path is provided, into which condensed water containing a nickel catalyst is poured from a condensed water tank that stores the condensed water, and the nickel catalyst is adsorbed onto the bottom surface by a magnet attached to the bottom surface. A condensate drain path for draining the condensate that has passed through the nickel catalyst adsorption path, An extrusion gas path for supplying extrusion gas to the nickel catalyst adsorption path, A nickel catalyst recovery path through which the nickel catalyst, which has been pushed out from the bottom surface by the extrusion gas, The system includes a nickel catalyst recovery box for recovering the nickel catalyst that has passed through the nickel catalyst recovery path.

[0007] One embodiment for achieving the above objective is: A nickel catalyst recovery method for recovering a nickel catalyst from condensate generated in methanation using a nickel catalyst methanation reactor, By flowing condensed water containing a nickel catalyst from a condensed water tank that stores the condensed water into a nickel catalyst adsorption path with a magnet attached to its bottom, the nickel catalyst is adsorbed onto the bottom surface. The condensed water that has passed through the nickel catalyst adsorption path is drained from the condensed water drain path. Extrusion gas is introduced into the nickel catalyst adsorption pathway from the extrusion gas pathway. The nickel catalyst, which has been pushed out from the bottom surface by the extrusion gas, is recovered into a nickel catalyst recovery box via a nickel catalyst recovery path. [Effects of the Invention]

[0008] According to this disclosure, it is possible to provide a nickel catalyst recovery structure and a nickel catalyst recovery method that can efficiently recover nickel catalysts. [Brief explanation of the drawing]

[0009] [Figure 1] This block diagram outlines the carbon recycling system. [Figure 2] This is a schematic cross-sectional view showing an example of the configuration of a methane reactor. [Figure 3] This is a schematic cross-sectional view of a nickel catalyst recovery structure according to an embodiment. [Figure 4] This is a schematic cross-sectional view of a nickel catalyst recovery structure according to an embodiment during nickel catalyst adsorption. [Figure 5] This is a schematic cross-sectional view of the nickel catalyst recovery structure according to the embodiment during wastewater treatment. [Figure 6] This is a schematic cross-sectional view of a nickel catalyst recovery structure according to an embodiment during nickel catalyst recovery. [Modes for carrying out the invention]

[0010] The embodiments of this disclosure will be described in detail below with reference to the drawings. In each drawing, the same or corresponding elements are denoted by the same reference numerals, and redundant explanations are omitted where necessary for clarity. Also, for ease of understanding, the scale of each part in the drawings may differ from that of actual parts.

[0011] First, with reference to Figure 1, an overview of the carbon recycling system 10 using the nickel catalyst recovery structure 130 according to the embodiment will be described. The carbon recycling system 10 is a system that recovers carbon dioxide contained in exhaust gas emitted from a factory to produce methane gas, and reuses the methane gas as fuel for use in the factory. As shown in Figure 1, the carbon recycling system 10 comprises a methanation reactor 100, a factory 200, and a carbon dioxide recovery unit 300.

[0012] Factory 200 uses methane gas as fuel to manufacture and process factory products such as parts and equipment. Factory 200 emits exhaust gas containing carbon dioxide generated when burning methane gas. Carbon dioxide recovery unit 300 recovers carbon dioxide from the exhaust gas emitted by Factory 200. Carbon dioxide recovery unit 300 sends the recovered carbon dioxide to the methanation reactor 100. The method of carbon dioxide recovery performed by 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 carbon dioxide recovery unit 300 to produce methane gas. The methanation reactor 100 sends the produced methane gas to Factory 200. Factory 200 uses the methane gas received from the methanation reactor 100 as fuel. In this way, the carbon recycling system 10 is a system that makes the carbon contained in the carbon dioxide emitted from Factory 200 reusable as methane gas.

[0013] Next, with reference to Figure 2, an example of the configuration of the methanation reactor 100 will be described. A nickel catalyst 110 is placed inside the methanation reactor 100. The nickel catalyst 110 catalyzes the reaction that produces methane gas from carbon dioxide and hydrogen. When carbon dioxide and hydrogen are introduced into the methanation reactor 100, methane gas and water (H2O) are produced by methanation. The produced methane gas and water are sent to a condensate tank 120 connected to the methanation reactor 100. The water becomes liquid in the process of being sent to the condensate tank 120 and is stored in the condensate tank 120. The methane gas is sent from the condensate tank 120 to the factory 200 and used as fuel. Hereinafter, the water stored in the condensate tank 120 may be referred to as condensate 121. The condensate 121 contains nickel catalyst 122, which is a part of the nickel catalyst 110 that has been powdered. Since the nickel catalyst 122 contains expensive nickel, it is preferable to recover and reuse it as much as possible.

[0014] Next, referring to FIG. 3, a configuration example of the nickel catalyst recovery structure 130 will be described. In FIG. 3, in addition to the nickel catalyst recovery structure 130, a condensate tank 120 is 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 drain path 150, an extrusion gas path 160, a nickel catalyst recovery path 170, and a nickel catalyst recovery box 180.

[0015] The nickel catalyst adsorption path 140 is connected to the condensate tank 120, and a magnet 141 is disposed outside the bottom surface. The magnet 141 is not particularly limited as long as it can change the magnetic force in the nickel catalyst adsorption path 140. The magnet 141 may be, for example, an electromagnet. Also, the magnet 141 may be a movable permanent magnet. The nickel catalyst adsorption path 140 can adsorb the nickel catalyst contained in the condensate to the bottom surface by the magnetic force of the magnet 141 and drain only the condensate. A valve 143 is disposed in the nickel catalyst adsorption path 140. The valve 143 is disposed near the end connected to the condensate tank 120.

[0016] The 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 to which the nickel catalyst has been adsorbed through the nickel catalyst adsorption path 140 is drained from the condensate drain path 150. A valve 153 is disposed in the middle of the condensate drain path 150.

[0017] The extrusion gas path 160 is connected near the end of the nickel catalyst adsorption path 140 that is connected to the condensate tank 120. The extrusion gas path 160 is a path for sending the extrusion gas toward the nickel catalyst adsorption path 140. The extrusion gas is, for example, an inert gas. A valve 163 is disposed in the middle of the extrusion gas path 160. The nickel catalyst adsorbed on the bottom surface of the nickel catalyst adsorption path 140 is pushed out by the extrusion gas sent from the extrusion gas path 160.

[0018] Near the end of the nickel catalyst adsorption path 140 that is connected to the condensate drain path 150, a nickel catalyst recovery path 170 is connected. A nickel catalyst recovery box 180 is connected to the other end of the nickel catalyst recovery path 170. A valve 173 is located in the middle of the nickel catalyst recovery path 170. The nickel catalyst extruded by the extrusion gas is recovered in the nickel catalyst recovery box 180 through the nickel catalyst recovery path 170.

[0019] Next, the operation of the nickel catalyst recovery structure 130 will be described in detail with reference to Figures 4-6. When recovering the nickel catalyst contained in the condensate, first, as shown in Figure 4, valve 143 is opened with valves 153, 163, and 173 closed, and the condensate 121 containing the nickel catalyst 122 is allowed to flow into the nickel catalyst adsorption path 140. If the magnet 141 is an electromagnet, the electromagnet switch is turned on when the condensate 121 containing the nickel catalyst 122 is allowed to flow into the nickel catalyst adsorption path 140. Also, if the magnet 141 is a permanent magnet, the magnet 141 is positioned near the outer bottom surface of the nickel catalyst adsorption path 140 when the condensate 121 containing the nickel catalyst 122 is allowed to flow 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 the magnet 141.

[0020] After the nickel catalyst 122 contained in the condensate 121 is adsorbed to the bottom surface of the nickel catalyst adsorption path 140, as shown in Figure 5, valve 143 is closed and valve 153 is opened to drain the condensate 121 through the condensate drain path 150. If the magnet 141 is an electromagnet, after draining the condensate 121 through the condensate drain path 150, the electromagnet is switched off. If the magnet 141 is a permanent magnet, after draining the condensate 121 through the condensate drain path 150, the magnet 141 is moved away from the outer bottom surface of the nickel catalyst adsorption path 140. Then, as shown in Figure 6, valves 163 and 173 are opened, and the nickel catalyst 122 is pushed out from the bottom surface of the nickel catalyst adsorption path 140 by the extrusion gas and collected in the nickel catalyst recovery box 180.

[0021] The nickel catalyst adsorption pathway 140 efficiently adsorbs the nickel catalyst 122 by submerging it at its bottom. 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.

[0022] This disclosure is not limited to the embodiments described above, and may be modified as appropriate without departing from its spirit. [Explanation of symbols]

[0023] 10 Carbon Recycling Systems 100 Methanation reactors 110 Nickel catalyst 120 Condensate Tank 121 Condensate 122 Nickel catalyst 130 Nickel catalyst recovery structure 140 Nickel catalyst adsorption pathway 141 Magnets 143, 153, 163, 173 valves 150 Condensate drainage path 160 Extrusion gas path 170 Nickel catalyst recovery pathway 180 Nickel catalyst recovery box 200 factories 300 carbon dioxide capture machines

Claims

1. A nickel catalyst recovery structure for recovering a nickel catalyst from condensate generated in methanation using a nickel catalyst methanation reactor, A nickel catalyst adsorption path is provided, into which condensed water containing a nickel catalyst is poured from a condensed water tank that stores the condensed water, and the nickel catalyst is adsorbed onto the bottom surface by a magnet attached to the bottom surface. A condensate drain path for draining the condensate that has passed through the nickel catalyst adsorption path, An extrusion gas path for supplying extrusion gas to the nickel catalyst adsorption path, A nickel catalyst recovery path through which the nickel catalyst, which has been pushed out from the bottom surface by the extrusion gas, The system includes a nickel catalyst recovery box for recovering the nickel catalyst that has passed through the nickel catalyst recovery path. Nickel catalyst recovery structure.

2. A nickel catalyst recovery method for recovering a nickel catalyst from condensate generated in methanation using a nickel catalyst methanation reactor, By flowing condensed water containing a nickel catalyst from a condensed water tank that stores the condensed water into a nickel catalyst adsorption path with a magnet attached to its bottom, the nickel catalyst is adsorbed onto the bottom surface. The condensed water that has passed through the nickel catalyst adsorption path is drained from the condensed water drain path. Extrusion gas is introduced into the nickel catalyst adsorption pathway from the extrusion gas pathway. The nickel catalyst, which is pushed out from the bottom surface by the extrusion gas, is recovered into a nickel catalyst recovery box via a nickel catalyst recovery path. Nickel catalyst recovery method.

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