沼氣提純在西歐（德國、丹麥、瑞典等）一些國家的動(dòng)力總量的比例為10%左右。沼氣提純技能，如加壓水洗法、化學(xué)吸收法、變壓吸附法和膜分離法等技能已完成商業(yè)化使用，其間加壓水洗法和變壓吸附法歐洲沼氣提純商場使用率高，各占1/3。
Biogas purification accounts for about 10% of the total power in some Western European countries (Germany, Denmark, Sweden, etc.). Biogas purification skills, such as pressurized water washing, chemical absorption, pressure swing adsorption and membrane separation, have been commercialized. Among them, pressurized water washing and pressure swing adsorption have the highest utilization rate in European biogas purification market, accounting for 1/3 of each.
在國內(nèi)，沼氣提純技能近幾年逐漸鼓起，但提純的首要工藝，包含脫硫、脫碳和脫水，在合成氨等工業(yè)氣體凈化項(xiàng)目中早已應(yīng)用廣泛并開展成熟。
In China, the technology of biogas purification has been gradually developed in recent years, but the primary technology of biogas purification, including desulfurization, decarbonization and dehydration, has been widely used and developed in industrial gas purification projects such as synthetic ammonia.
脫硫方面，可分為干法和濕法兩大類，其間干法以活性碳法和氧化鐵法為主，濕法包含化學(xué)法、物理法和物化法。在硫含量低的情況下選用干法脫硫即可，硫含量高的情況下一般以濕式氧化法為主，并選用干法脫硫加以輔佐結(jié)合。
As for desulfurization, it can be divided into dry and wet methods, in which the dry method mainly consists of activated carbon method and iron oxide method, and the wet method includes chemical method, physical method and physical and chemical method. In the case of low sulfur content, dry desulfurization can be used. In the case of high sulfur content, wet oxidation is the main method, and dry desulfurization is used to assist the combination.
脫碳方面，首要有加壓水洗法、變壓吸附法、膜分離法等物理法和NDEA、碳酸丙烯酯等化學(xué)法，其間壓力水洗法和變壓吸附法是較為成熟和安穩(wěn)的工藝，適用于大型沼氣工程，運(yùn)行可靠性高，工程經(jīng)驗(yàn)多，壓力水洗法甲烷回收率更具優(yōu)勢。
In terms of decarbonization, physical methods such as pressurized water washing, pressure swing adsorption, membrane separation and chemical methods such as NDEA and propylene carbonate are the main methods. Pressure water washing and pressure swing adsorption are mature and stable processes, which are suitable for large-scale biogas projects with high operational reliability, more engineering experience and more advantages in methane recovery by pressure water washing.
脫水方面，在國內(nèi)的加氣母站均設(shè)有脫水設(shè)備，一般選用物理吸附脫水法。
As for dehydration, there are dehydration equipments in domestic gas filling mother stations. Physical adsorption dehydration method is generally used.
經(jīng)過上述工藝，可使凈化氣到達(dá)車用燃?xì)庖?guī)范，凈化后的產(chǎn)品氣可進(jìn)入城市燃?xì)夤芫W(wǎng)。
Through the above process, the purified gas can reach the vehicle gas specification, and the purified product gas can enter the city gas pipeline network.
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2019-02-13
