Method for producing methane

Abstract

The invention provides a method for producing methane. The method comprises steps as follows: methanation feed gas and a high-temperature methanation catalyst are subjected to a contacting reaction ina moving bed methanation reactor, and a gas flow I containing rich methane and the high-temperature methanation catalyst with reduced catalytic activity are obtained; the gas flow I and the methanation catalyst are subjected to a contacting reaction in a fixed bed methanation reactor, and a gas flow II containing rich methane is obtained; the high-temperature methanation catalyst with reduced catalytic activity is divided into three parts, the first part of the catalyst is sent into a regeneration reactor for regeneration treatment, and the regenerated high-temperature methanation catalyst issent into the moving bed methanation reactor to be recycled; the second part of the catalyst is discharged out of a reaction system as a waste catalyst; the third part of the catalyst is directly send into the moving bed methanation reactor to be recycled. The strict requirements for raw gas pretreatment procedures are effectively reduced, the pressure drop of the reactor is reduced, and energy consumption required for gas circulation is reduced.

Description

technical field [0001] The invention relates to a method for indirect conversion of carbon-containing materials, more specifically, a method for converting carbon-containing materials into synthesis gas and synthesis gas into methane gas. Background technique [0002] With the rapid growth of China's economy, traditional natural gas and oil resources are far from meeting the needs of social production and people's lives. It is estimated that by 2020, China's natural gas gap will exceed 100 billion cubic meters (standard) per year. Considering China's energy endowment and energy security, it is necessary to convert coal and biomass into civil gas, transportation fuel, and basic chemical raw materials. Among them, the coal-to-natural gas technology is the process of using low-rank lignite to produce syngas through gasification, and then convert it into methane, which is used as gas fuel. The coal-to-natural gas process has high energy efficiency, low water consumption, and r...

AI Technical Summary

Problems solved by technology

Obviously, the catalyst development cycle is too long, which undoubtedly greatly increases the difficulty of catalyst development

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