膜分離技術(shù)，被認為是21世紀工業(yè)技術(shù)改造中的一項極為重要的技術(shù)。隨著性能優(yōu)異的新型膜材料不斷涌現(xiàn)，進一步開發(fā)出用于沼氣脫碳的高效低成本膜分離技術(shù)，將有助于推薦生物燃氣產(chǎn)業(yè)的發(fā)展。沼氣膜分離是指在壓力差為推動力的作用下，利用沼氣中各組分在氣體分離膜中滲透速率的不同而達到分離純化CH4的目的。

　　Membrane separation technology is considered an extremely important technology in the industrial technological transformation of the 21st century. With the continuous emergence of high-performance new membrane materials, further development of efficient and low-cost membrane separation technology for biogas decarbonization will help promote the development of the biogas industry. Biogas membrane separation refers to the use of pressure difference as a driving force to achieve the separation and purification of CH4 by utilizing the different permeation rates of various components in biogas in the gas separation membrane.

　　當(dāng)無液態(tài)水、無油的壓縮沼氣沿中空纖維管內(nèi)腔流動時，各種氣體的分壓在中空纖維絲管的高壓側(cè)（原料側(cè)）與低壓側(cè)（滲透側(cè)）所形成的驅(qū)動力——分壓差作用下，溶解系數(shù)和擴散系數(shù)大的氣體（如CO2）優(yōu)先通過管壁，其余氣體（CH4）相對受到阻隔，從而達到分離的目的。

　　When compressed biogas without liquid water or oil flows along the inner cavity of a hollow fiber tube, the partial pressure of various gases is driven by the differential pressure between the high-pressure side (raw material side) and low-pressure side (permeation side) of the hollow fiber tube. Gases with high solubility and diffusion coefficients (such as CO2) preferentially pass through the tube wall, while the remaining gases (CH4) are relatively blocked, thus achieving the purpose of separation.

　　目前最適用于沼氣提純的膜是聚酰胺膜和EC膜，國內(nèi)外已有大量沼氣工程使用膜法提出技術(shù)，推廣及應(yīng)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）。沼氣膜分離技術(shù)工藝流程圖：膜法分離的特點：除電耗外，無額外輔助材料，沒有二次污染；工藝流程簡單、可靠性高；投資及運行費用低；占地面積小、開停車簡單、使用壽命長；產(chǎn)品CH4純度可達≥95%；安裝快速簡單。

　　At present, the most suitable membranes for biogas purification are polyamide membranes and EC membranes. A large number of biogas projects at home and abroad have proposed technologies using membrane methods, which have been widely promoted and applied by American company Medal, Dutch company DMT, German company Evonik, Norwegian company Memfoact, and Japanese company UBE. Process flowchart of biogas membrane separation technology: Characteristics of membrane separation: Apart from electricity consumption, there are no additional auxiliary materials and no secondary pollution; Simple process flow and high reliability; Low investment and operating costs; Small footprint, simple driving and parking, long service life; The purity of CH4 in the product can reach ≥ 95%; Quick and easy installation.

　　膜分離法提純沼氣所需時間取決于多種因素，包括沼氣處理量、膜組件性能、工藝設(shè)計及操作條件等，目前公開資料中未明確給出具體時長。一般來說，膜分離法可連續(xù)運行，處理速度較快，通常能在數(shù)小時內(nèi)將一定量的沼氣提純至目標(biāo)純度（如95%以上）。實際應(yīng)用中，小型沼氣工程可能每天處理數(shù)立方米沼氣，大型項目處理量可達數(shù)千立方米/小時，具體時間需根據(jù)項目規(guī)模和設(shè)備參數(shù)確定。若需精確數(shù)據(jù)，可將您的具體情況反饋給我么，恒能會安排專業(yè)人員與您溝通解決。

　　The time required for membrane separation to purify biogas depends on various factors, including biogas treatment capacity, membrane component performance, process design, and operating conditions. Currently, the specific duration is not clearly provided in publicly available information. Generally speaking, membrane separation method can operate continuously and has a fast processing speed. It can usually purify a certain amount of biogas to the target purity (such as over 95%) within a few hours. In practical applications, small-scale biogas projects may process several cubic meters of biogas per day, while large-scale projects can process thousands of cubic meters per hour. The specific time depends on the project scale and equipment parameters. If you need accurate data, can you provide us with your specific situation feedback? Hengneng will arrange professional personnel to communicate with you to solve the problem.