Combined tower type methanation apparatus and methanation process

Abstract

The invention provides a combined tower type methanation apparatus and a methanation process. The methanation process comprises the following steps that: feed gas exchanges heat with high-temperaturegas via a winding heat exchanger II, then enters a winding heat exchanger I for heat exchange and then undergoes a methanation reaction in an isothermal catalyst bed I so as to form high-temperature gas I; the high-temperature gas I is cooled by the winding heat exchanger I and then enters a heat-insulation stationary catalyst bed I, and reacted high-temperature gas is cooled and then enters an isothermal catalyst bed II so as to form high-temperature gas II; the high-temperature gas II is cooled by the winding heat exchanger II and then enters a heat-insulation stationary catalyst bed II, then continuous cooling is carried out and gas-liquid separation is conducted via a gas-liquid separator I, and a gas phase enters the winding heat exchanger II for heat exchange with high-temperature gas and then enters a supplementary methanation reactor; and reacted process gas successively passes through a boiler feed water preheater III, an air cooler, a water cooler and a gas-liquid separator II so as to separate a product, i.e., natural gas. The process provided by the invention has higher economic benefits, lower comprehensive energy consumption and smaller equipment size.

Description

Technical field [0001] The invention relates to the technical field of methanation, and more specifically, to a composite tower methanation device and a methanation process. Background technique [0002] Methanation is the core technology for replacing natural gas with coal. The methanation reaction is a reaction with strong exotherm and volume reduction. At present, the methanation process of existing industrial plants is a multi-stage adiabatic fixed bed reaction process, in order to quickly remove the reaction heat And to ensure that the reaction temperature rise is not too large, the purpose of controlling the reaction temperature is achieved by circulating part of the product gas, which increases the setting of the circulating compressor, and increases the energy consumption and operating costs. At the same time, in order to obtain natural gas that meets product requirements, multi-stage adiabatic fixed-bed reactors need to be set up, and multiple heat exchangers are set bet...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of complex flow, large investment, high energy consumption, and large land occupation in the existing methanation process. The present invention provides a composite tower methanation device and methanation process, combined with an adiabatic fixed bed reactor , isothermal reactor, and the characteristics and advantages of wound heat exchangers simplify the process, deepen the reaction balance, and reduce the setting of the methanation reactor

Images