Biogas purification: membrane separation skills
膜別離技能，被認(rèn)為是21世紀(jì)工業(yè)技能改造中的一項(xiàng)極為重要的技能。跟著功能優(yōu)異的新式膜材料不斷涌現(xiàn)，進(jìn)一步開宣布用于沼氣脫碳的低成本膜別離技能，將有助于引薦生物燃?xì)夤I(yè)的開展。
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.
沼氣膜別離是指在壓力差為推動力的效果下，利用沼氣中各組分在氣體別離膜中浸透速率的不同而到達(dá)別離純化CH4的意圖。
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.
當(dāng)無液態(tài)水、無油的緊縮沼氣沿中空纖維管內(nèi)腔活動時，各種氣體的分壓在中空纖維絲管的高壓側(cè)（質(zhì)料側(cè)）與低壓側(cè)（浸透側(cè)）所形成的驅(qū)動力——分壓差效果下，溶解系數(shù)和擴(kuò)散系數(shù)大的氣體（如CO2）優(yōu)先經(jīng)過管壁，其他氣體（CH4）相對受到阻隔，從而到達(dá)別離的意圖。
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.



現(xiàn)在適用于沼氣提純的膜是聚酰胺膜和EC膜，國內(nèi)外已有很多沼氣工程運(yùn)用膜法提出技能，推行及運(yùn)用較為廣泛的有美國麥道（Medal）、荷蘭DMT公司、德國Evonik、挪威Memfoact和日本宇部（UBE）。
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.
膜法別離的特色：
Characteristics of membrane separation:
除電耗外，無額定輔助材料，沒有二次污染；
In addition to electricity consumption, there is no rated auxiliary material, and there is no two pollution.
工藝流程簡略、可靠性高；
The process is simple and reliable.
出資及運(yùn)行費(fèi)用低；
The cost of capital contribution and operation is low.
占地面積小、開泊車簡略、運(yùn)用壽命長；
The utility model has the advantages of small space occupation, simple parking and long service life.
產(chǎn)品CH4純度可達(dá)≥95%；
The purity of the product CH4 can reach more than 95%.
裝置快速簡略。
The device is fast and simple.
特別適合中小規(guī)劃的生物燃?xì)夤こ添?xiàng)目。
It is especially suitable for bio gas projects in small and medium-sized planning.
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