System for preparing methane through methane temperature self-raising-based membrane separation method

Abstract

The invention discloses a system for preparing methane through a methane temperature self-raising-based membrane separation method. The problem of high production cost caused by high electric energy consumption in membrane separation methods for preparing methane in the prior art is solved. An air-to-air heat exchanger is arranged between a freezing dryer and a module to heat moisture and impurityremoved biogas output by the freezing dryer, and the heat source gas of the air-to-air heat exchanger adopts a high-temperature compressed biogas compressed by a compressor to realize self-raising ofthe temperature of the biogas, so the biogas compressed by the compressor has dual purposes, the working heat of the compressor is fully utilized, the link of an electric heater is omitted, and the effects of saving energy and reducing the production cost are achieved.

Description

technical field [0001] The invention relates to a high-purity methane preparation system, in particular to a system and a method for raising the temperature of biogas during the process of separating and preparing methane by using a membrane separation method. Background technique [0002] Methane is purified by biogas, and the commonly used methods include pressure swing adsorption, water washing, and membrane separation; the membrane separation method is obtained by analyzing and separating the biogas passing into the membrane through the membrane group High-purity methane. This method is based on the fact that different gas molecules in the biogas pass through the membrane filaments at different rates. The more common process is that the biogas first passes through the first-stage membrane group for analysis and separation, and then enters the second stage. The membrane group is analyzed and separated again to obtain methane. In this method, the membrane group has certain...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a methane preparation system based on the biogas temperature self-increasing membrane separation method, which overcomes the technical problem of high power consumption and high production cost in the prior art when methane is prepared by the membrane separation method

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