Methanation system and method for preparing natural gas from coke-oven gas

Abstract

The invention provides a methanation system and method for preparing natural gas from coke-oven gas. The system comprises a homogeneous methanation reactor with a quench gas distributor and a heat insulation methanation reactor; tower entering gas consists of three parts including purified coke oven gas, supplementing CO2 and medium pressure steam; the other path of purified coke oven gas is usedas quench gas, and enters an array pipe of the homogeneous methanation reactor from the quench gas distributor to take methanation reaction; the self low temperature can be used for inhibiting the hotpoint temperature fly temperature of the reactor bed layer, wherein two kinds of different methanation catalysts are respectively filled in the array pipes of the homogeneous methanation reactor; other space in the array pipe is filled by heat conduction porcelain balls; heat released by methanation reaction is fast moved away through circulation water in a reactor shell pass; meanwhile, a heat insulation methanation reactor is connected in series behind the homogeneous methanation reactor for supplementary methanation reaction so as to improve the methanation depth; qualified natural gas products are produced. The coke oven gas methanation reaction process has the advantages that the operation temperature is constant; the methanation catalyst is well protected; the catalysis efficiency is high; the energy is saved; the operation is easy.

Description

technical field [0001] The invention belongs to the technical field of synthetic natural gas, in particular to a methanation system and method for producing natural gas from coke oven gas. Background technique [0002] The core technology of synthetic natural gas is methanation catalyst and methanation process technology. Among them, the development of methanation catalyst is relatively mature, and there are countless research institutes in China that master the production process of methanation catalyst. The natural gas chemical plants all adopt foreign technology and technology, and the domestic technology has not yet realized industrial application due to immaturity; the key to the methanation technology is to solve the problems of large heat release and difficult heat extraction during the reaction process, and maintain the reactor The key to natural gas synthesis technology is to keep the bed temperature constant and prevent catalyst deactivation and sintering under hig...

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Problems solved by technology

Chinese patent CN102827657 uses multiple low-temperature reactors for methanation reaction, which not only increases equipment investment, but also has problems such as difficulty in scaling up the process

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