High purity and high recovery rate methane concentration production process and implementing device thereof

Abstract

The invention discloses a high purity and high recovery rate methane concentration production process and an implementing device thereof. The production process comprises membrane separation, pressure swing adsorption, regeneration and the like. A methane concentrator comprises a gas inlet pipe (1), a first membrane component (2), a first buffer tank (3), at least three adsorption towers (4), a second membrane component (6), a second buffer tank (7), a gas outlet pipe (8) and a reverse drain pipe (9); the gas inlet pipe (1), the first membrane component (3) and the first buffer tank (3) are sequentially communicated through a pipeline; and the first buffer tank (3), the second buffer tank (7), the gas outlet pipe (8) and the reverse drain pipe (9) are respectively communicated with the adsorption towers (4) through a pipeline with a pneumatic shut-off valve. By the process and the implementing device, the scale of a pressure swing adsorption device can be reduced, the yield of methane is improved and the cost is reduced.

Description

technical field [0001] The invention relates to the field of methane concentration, in particular to a high-purity, high-recovery methane concentration production process and a realization device. Background technique [0002] Biogas, landfill gas, etc. are all methane-rich gases, and their methane content is generally between 45% and 65%, which has extremely high utilization value, but it also contains about 40% of CO 2 , and a small amount of N 2 、H 2 S and O 2 etc., making the direct utilization efficiency not high, not suitable for long-distance transportation, and unable to be practical as civil and industrial raw materials. Only through separation and purification, impurities can be removed, and concentrated methane can be obtained, whose calorific value is equivalent to that of natural gas, and safe, convenient and economical long-distance transportation can be realized. Not only is it a clean, high-efficiency energy that can be used directly, it can also be lique...

AI Technical Summary

Problems solved by technology

[0004] The pressure swing adsorption method is a technology for separating and purifying a gas from a mixed gas. It is based on the difference in the adsorption capacity of the adsorbent for the gas under high and low pressure. It is a cyclic process composed of selective adsorption and desorption regeneration. It is energy-saving, Environmentally friendly, safe and efficient methane concentration method, but the yield is not high due to the discharge of reverse pumping air during the regeneration process

Membrane separation is to use the different permeability of the membrane to carbon dioxide and methane to realize CO 2 with CH 4 Separation, but the purity of the finished methane is not too high, and under the higher purity requirements, the membrane separation process needs to be completed under a high pressure of 1.7~5.5MPa, and the operating cost is high

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