Methanation technology

Abstract

The invention relates to a methanation technology. The methanation technology is characterized by comprising the steps that a material is sent to a first methane reactor to carry out a primary methanation reaction, and after a second puff of feed gas is added into a primary reaction product obtained, the mixture is sequentially sent to a second methane reactor to carry out a secondary methanation reaction and a third methane reactor to carry out a third-time methanation reaction; a third-time methanation reaction product is subjected to primary gas-liquid separation, a gas phase obtained is sent to a fourth methane reactor to carry out a fourth-time methanation reaction, and a fourth-time methanation reaction product obtained is subjected to secondary gas-liquid separation after heat is recovered; and natural gas is obtained after a liquid phase is separated out. By the adoption of the methanation technology, the reaction temperatures in all the methane reactors can be effectively controlled, and reaction overheat is avoided thoroughly; and meanwhile, equipment investment is reduced, the floor space is decreased, the energy recovery rate is increased, the technological process and system control are simplified, the energy-saving and cost-reducing effect is good, and economic benefits are also good.

Description

technical field [0001] The invention relates to a chemical process and equipment, specifically a methanation process. Background technique [0002] At present, there are mainly three syngas-to-methane processes that have achieved commercial operation or long-term trial operation: Lurgi methanation technology, Topsoe methanation technology (TREMPTM), and David methanation technology (CRG). All three technologies divide the process into two parts: main methanation and refined methanation. In order to control the overtemperature of the main methanation reaction, a recycle gas compressor is installed to return the reacted synthesis gas to the inlet through a recycle loop to reduce the feed gas. In order to achieve the purpose of controlling the reaction temperature. The setting of the circulating compressor increases the energy consumption, land occupation and operating cost of the device; the temperature control and adjustment measures are complicated, and multiple devices are...

AI Technical Summary

Problems solved by technology

The setting of the circulating compressor increases the energy consumption, land occupation and operating cost of the device; the temperature control and adjustment measures are complicated, and multiple devices are operating under extreme conditions such as high temperature and high pressure, and fluctuations in working conditions and raw material composition can easily cause reaction overtemperature

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