沼氣凈化的目的是去除對(duì)后續(xù)工藝有不利影響的雜質(zhì)，包括硫化氫和水。沼氣中含有較多的硫化氫和飽和水蒸氣。隨著溫度的降低，水蒸氣凝結(jié)成水，與硫化氫分離，對(duì)管道和設(shè)備造成腐蝕。另外沼氣中的水分會(huì)凝結(jié)，所以如果管道保溫不好，在冬季很容易形成管道梗塞，影響閥門的正常運(yùn)行。另外，從環(huán)保的角度來(lái)看，用沼氣撲滅硫化氫產(chǎn)生的二氧化硫會(huì)污染環(huán)境。
The purpose of biogas purification is to remove impurities that have adverse effects on subsequent processes, including hydrogen sulfide and water. Methane contains more hydrogen sulfide and saturated water vapor. As the temperature decreases, water vapor condenses into water and separates from hydrogen sulfide, causing corrosion to pipelines and equipment. In addition, the moisture in biogas will condense, so if the pipe insulation is not good, it is easy to form pipe blockage in winter, affecting the normal operation of the valve. In addition, from the perspective of environmental protection, putting out sulfur dioxide produced by hydrogen sulfide with biogas will pollute the environment.
物理、化學(xué)和生物方法可用于去除沼氣中的硫化氫。物理脫硫法一般采用活性炭法；化學(xué)脫硫法中干法脫硫常用氧化鐵脫硫劑，化學(xué)脫硫法中濕法脫硫常用濕法888脫硫和絡(luò)合鐵脫硫。生物法主要指生物脫硫。選擇詳細(xì)計(jì)劃時(shí)，應(yīng)考慮沼氣中硫化氫的含量和要求的去除水平。
Physical, chemical and biological methods can be used to remove hydrogen sulfide from biogas. Physical desulfurization method generally adopts activated carbon method; Iron oxide desulfurizer is commonly used for dry desulfurization in chemical desulfurization method, and wet 888 desulfurization and complex iron desulfurization are commonly used for wet desulfurization in chemical desulfurization method. Biological method mainly refers to biological desulfurization. When selecting the detailed plan, the content of hydrogen sulfide in biogas and the required removal level should be considered.
沼氣脫水主要包括重力脫水、低溫冷凝和分子篩等深度脫水。
Biogas dehydration mainly includes gravity dehydration, low-temperature condensation, molecular sieve and other deep dehydration.
沼氣凈化中的脫硫塔通常采用常壓干法脫硫，將氧化鐵脫硫劑置于脫硫塔中進(jìn)行脫硫；脫硫前通常先脫水，因此在脫硫塔前放置一臺(tái)汽水分離器。沼氣進(jìn)入脫硫塔脫硫前，先經(jīng)過(guò)汽水分離器脫水；設(shè)置精細(xì)過(guò)濾器，設(shè)計(jì)壓差小，過(guò)濾面積大，可有效攔截細(xì)小雜質(zhì)，滿足應(yīng)用要求，提高沼氣應(yīng)用效率。為了避免在運(yùn)行過(guò)程中產(chǎn)生熱量，有時(shí)需要在凈化系統(tǒng)中設(shè)置冷水機(jī)組。氣體輸送泵和阻火器是系統(tǒng)中必不可少的輔助部件。
The desulfurization tower in biogas purification usually adopts atmospheric pressure dry desulfurization, and the iron oxide desulfurizer is placed in the desulfurization tower for desulfurization; Dehydration is usually carried out before desulfurization, so a steam water separator is placed in front of the desulfurization tower. Before entering the desulfurization tower for desulfurization, the biogas shall be dewatered through the steam water separator; The fine filter with small design pressure difference and large filtering area can effectively intercept small impurities, meet the application requirements and improve the application efficiency of biogas. In order to avoid heat generation during operation, sometimes it is necessary to set up a chiller in the purification system. Gas delivery pump and flame arrester are essential auxiliary components in the system.
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