Biogas purification: membrane separation skills
Membrane separation skills are considered to be an extremely important skill in the transformation of industrial skills in twenty-first Century. With the continuous emergence of new membrane materials with excellent functions, further announcement of high-efficiency and low-cost membrane separation skills for biogas decarbonization will be helpful to introduce the development of biogas industry.
Biogas membrane separation refers to the intention of separating and purifying CH4 by utilizing the different permeation rates of each component in biogas membrane under the effect of pressure difference as a driving force.
When the compressed methane without liquid water and oil moves along the inner cavity of hollow fiber tube, the partial pressure of various gases is the driving force formed by the high pressure side (material side) and low pressure side (immersion side) of hollow fiber tube. Under the effect of partial pressure difference, the gases with large dissolution coefficient and diffusion coefficient (such as CO2) pass through the tube wall first, and other gases with large diffusion coefficient (such as CO2) pass through the tube wall first. Gas (CH4) is relatively obstructing, thus reaching the intention of leaving.
The most suitable biogas purification membranes are polyamide membranes and EC membranes. There are many biogas projects at home and abroad that use membrane technology to propose skills. Medal, DMT, Evonik, Memfoact, Norway and UBE are widely applied.
Characteristics of membrane separation:
In addition to electricity consumption, there is no rated auxiliary material, and there is no two pollution.
The process is simple and reliable.
The cost of capital contribution and operation is low.
The utility model has the advantages of small space occupation, simple parking and long service life.
The purity of the product CH4 can reach more than 95%.
The device is fast and simple.
It is especially suitable for bio gas projects in small and medium-sized planning.
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