Complete methanation reaction device for synthesis gas

Abstract

The invention relates to a complete methanation reaction device for synthesis gas. The device consists of a tube-shell reactor, a heat exchanger, a steam pocket, a make-up water pump, a condenser and a gas-liquid separator, wherein a catalyst is filled in a tube of the reactor; the shell pass is superheated water for removing heat; heat released in methanation reaction is absorbed through the phase change of high-pressure superheated water in the shell pass of the reactor and taken out of the device; the generated steam enters the steam pocket, is subjected to gas-liquid balance and can directly form superheated steam to be supplied to the outside; the temperature of a catalyst bed in the tube of the reactor is regulated and controlled by controlling the balance pressure of the superheated steam; reaction product exit gas exchanges heat with raw material gas and is continuously condensed; and a gaseous product and a liquid product are separated by the gas-liquid separator. The device can realize the continuous and stable operation of the complete methanation reaction of the synthesis gas, can effectively improve heat transfer efficiency and control the temperature of the reaction bed in a phase change heat transfer mode at a high temperature and under high pressure, expands the operation range of the complete methanation reaction of the synthesis gas, and can effectively recycle the heat released in the reaction.

Description

Technical field [0001] The invention belongs to the field of syngas methanation, and particularly relates to a synthesis gas complete methanation reaction device. Background technique [0002] The synthesis gas methanation reaction can increase the fuel gas heat density, reduce fuel gas transportation power consumption and investment in storage and transportation equipment, and has better economic efficiency. The methanation reaction is a strong exothermic reaction. In order to ensure the production efficiency and operation continuity of the methanation process, and to avoid the catalyst sintering deactivation caused by the bed temperature, the process design of the reaction heat removal method becomes the methanation process. The core content of technology. [0003] CN91106812.0 discloses a multi-stage adiabatic fixed-bed reaction process jointly developed by German Lurgi company and South Africa SASOL company, which adopts an improved water-vapor ratio to control the reaction he...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a synthesis gas complete methanation reaction device and an integrated reaction method in order to solve the problems of small production capacity and complex process caused by reaction heat transfer and its recycling in the methanation fixed bed process, the device and The method is suitable for the integrated process of transferring heat in the shell-and-tube reactor of the methanation fixed-bed process and simultaneously producing superheated steam, using high-pressure superheated water as the heat-transfer medium, transferring heat through the phase change of superheated water, and producing high High-grade superheated steam; this method can improve heat transfer efficiency, simplify the process, and increase device capacity

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