Biogas membrane purification system and method

Abstract

The invention discloses a biogas membrane purification system and a method, and the system is characterized in that a refrigeration dryer is provided with a purified biogas inlet, and a gas outlet atthe rear end of the refrigeration dryer is sequentially connected with a filter, a buffer tank, a biogas compressor, a second refrigeration dryer, a heat exchanger, a heater, a purification membrane group and a natural gas compressor; the natural gas compressor is provided with a finished natural gas outlet; vent holes for discharging air are formed in the buffer tank, the biogas compressor, the purification membrane group and the natural gas compressor. The refrigeration dryer, the filter, the buffer tank, the biogas compressor, the second refrigeration dryer, the heat exchanger and the heater which are connected in sequence are arranged at the front end of a purification membrane group; desulfurized and purified raw material biogas can be sequentially subjected to dehydration drying, filtration, compression, heating and other treatment and then enters a membrane system of a purification membrane group, and water drops, oil drops, aerosol and the like are intercepted through filtration so as to avoid pollution to a membrane. The method has the advantages of simple process flow, low energy consumption, simple equipment maintenance and the like.

Description

technical field [0001] The invention relates to the field of biogas purification, in particular to a biogas membrane purification system and method. Background technique [0002] In recent years, driven by China's policy of reducing coal and increasing gas, natural gas has become the energy product with the fastest growing demand in China in recent years. Facing the rapidly rising demand for natural gas consumption in my country, the development of bio-natural gas will help optimize the natural gas supply structure and develop modern new energy industries. The development of bio-natural gas, based on domestic and endogenous development, as an important supplement to conventional natural gas, is conducive to filling the short board of natural gas supply and demand, reducing dependence on imports, and improving energy security. Promote the transformation and upgrading of biomass energy, accelerate the application of renewable energy in the gas field, and cultivate and develop...

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Problems solved by technology

[0005] Based on the problems existing in the prior art, the object of the present invention is to provide a biogas membrane purification system and method, which can solve the problem of the existing biogas purification system using gas membrane separation. The existing membrane elements are expensive, easy to damage, plastic Chemicalization and aging will shorten the life of the membrane, and the maintenance cost is high; the membrane element is sensitive to oil and dust, and the requirements for oil and dust removal in the early stage are strict; the CH4 recovery rate is low

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