System and method for simultaneous dry-method hydrogen production from catalytic methane decomposition and carbon dioxide separation

Abstract

The invention provides a system and method for simultaneous dry-method hydrogen production from catalytic methane decomposition and carbon dioxide separation. The system comprises a methane decomposition system (I), a catalyst regeneration system (II), a gas solid separation system (III), and a gas circulating system (IV), wherein the methane decomposition system (I) is used for preparing and purifying hydrogen; the catalyst regeneration system (II) is used for receiving the deactivated catalyst, and the methane mixed gas, which is not completely converted, from the methane decomposition system (I), and causing the deactivated catalyst and the methane mixed gas to react with an oxide to eliminate carbon decomposition and provide the heat needed by the methane decomposition system (I); the gas solid separation system (III) is used for receiving and separating the solid particle and conveyed gas from the catalyst regeneration system (II) and the methanol decomposition system (I), and conveying the separated solid particle and conveyed gas into corresponding reactors; the gas circulating system (IV) is used for receiving the carbon dioxide gas from the gas solid separation system (III), collecting partial carbon dioxide gas, and returning partial carbon dioxide and decomposed gas into a reduction reactor (7). By adopting the system disclosed by the invention, the full-component graded conversion of the methanol is achieved.

Description

technical field [0001] The invention discloses a method for producing hydrogen by catalytically decomposing dry methane while separating carbon dioxide, and relates to the field of fossil energy utilization. Background technique [0002] Hydrogen energy is an ideal energy source. Compared with fossil fuels, hydrogen combustion has no pollution to the environment. Since there is no elemental hydrogen that can be directly exploited in nature, hydrogen energy mainly comes from the reforming or decomposition of hydrocarbon compounds. In recent years, Georges Mitchell's process of creating hydraulic fracturing has drastically reduced the cost of shale gas extraction and more than doubled reserves of natural gas (mainly methane), which has the highest oxygen-carbon content in hydrocarbons Therefore, the efficient production of hydrogen energy from methane has a good application prospect. [0003] Conventional hydrogen production processes include steam reforming of methane, part...

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Problems solved by technology

[0006] Purpose of the invention: The present invention aims to solve the problem of the catalyst being prone to carbon deposition and loss of catalytic performance in the process of catalytic decomposition of methane, resulting in reduced process stability and continuity; To eliminate the problem of carbon dioxide separation after carbon deposition, a system and method for dry methane catalytic decomposition to produce hydrogen while separating carbon dioxide is proposed. High-valence oxides are used to eliminate the carbon deposition of the catalyst and provide heat for methane decomposition. A method for capturing carbon dioxide, i.e. a method for producing hydrogen by catalytic decomposition of dry methane while separating carbon dioxide

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