沼氣的主要成分是CH4和CO2，此外，還含有微量的H2O、水等雜質(zhì)。利用沼氣生產(chǎn)管道燃?xì)狻NG和LNG，其技術(shù)難點(diǎn)在于沼氣的凈化提純。因此需要通過(guò)必要的沼氣凈化提純技術(shù)，使沼氣成為甲烷含量高，熱值和雜質(zhì)等條件符合管道、壓縮或液化天然氣標(biāo)準(zhǔn)要求的高品質(zhì)生物天然氣。
Methane is mainly composed of CH4 and CO2. In addition, it also contains a small amount of H2O, water and other impurities. The technical difficulty of using biogas to produce pipeline gas, GNG and LNG lies in the purification of biogas. Therefore, it is necessary to adopt necessary biogas purification and purification technology to make biogas become high-quality biological natural gas with high methane content and conditions such as calorific value and impurities that meet the requirements of pipeline, compressed or liquefied natural gas standards.
沼氣凈化一般是去除沼氣中微量的有害組分，以提高燃?xì)獾倪m用性和熱值，經(jīng)過(guò)凈化提純得到的生物天然氣可以作為替代天然氣使用。凈化提純工藝有幾方面，沼氣脫硫，沼氣脫氧，沼氣干燥，沼氣脫碳，其他雜質(zhì)的脫除。1、脫硫工藝，發(fā)酵過(guò)程產(chǎn)生的氣體經(jīng)過(guò)干燥柜重力除水和高能離子除臭設(shè)備除水、除臭后進(jìn)入雙膜儲(chǔ)氣囊暫存。由于沼氣原氣中含有一定量的H2S氣體，需經(jīng)過(guò)脫硫工序?qū)2S氣體脫除凈化。氣體從干法脫硫塔的底部進(jìn)入，頂部排出，氣體在干法脫硫塔內(nèi)與干法脫硫劑接觸，使得H2S被脫除。2、沼氣脫碳，脫硫后的沼氣經(jīng)過(guò)氣柜穩(wěn)壓后，經(jīng)過(guò)濾器去除飽和水蒸氣和微塵粒后，進(jìn)入膜分離裝置，使得CH4、CO2混合氣體彼此分離，分離后終沼氣中CO2濃度在3%以下，分離出的CO2幾乎不含CH4。
Biogas purification is generally to remove trace harmful components in biogas to improve the applicability and calorific value of gas. The purified biogas can be used as a substitute for natural gas. There are several aspects of purification process, including biogas desulfurization, biogas deoxidation, biogas drying, biogas decarbonization and removal of other impurities. 1. In the desulfurization process, the gas generated in the fermentation process enters the double membrane air bag for temporary storage after being dewatered by gravity in the drying cabinet and dewatered and deodorized by the high-energy ion deodorization equipment. Since biogas raw gas contains a certain amount of H2S gas, H2S gas needs to be removed and purified through desulfurization process. The gas enters from the bottom of the dry desulfurization tower and is discharged from the top. The gas contacts with the dry desulfurizer in the dry desulfurization tower to remove H2S. 2. Biogas decarbonization: after the desulfurization biogas is stabilized in the gas holder, the saturated steam and micro dust particles are removed through the filter, and then enter the membrane separation device to separate the CH4 and CO2 mixed gas from each other. After separation, the CO2 concentration in the final biogas is less than 3%, and the separated CO2 contains almost no CH4.
沼氣凈化提純生產(chǎn)生物甲烷，品質(zhì)相當(dāng)于化石天然氣，在條件允許下，可直接并入管道燃?xì)?，也可制成壓縮天然氣，用于汽車燃料等。沼氣凈化提純技術(shù)工藝較多，開(kāi)封迪爾空分可根據(jù)用戶自身資金成本和能源化利用目標(biāo)進(jìn)行設(shè)計(jì)選擇。
Biogas purification and purification produces biomethane, which is equivalent to fossil natural gas in quality. If conditions permit, it can be directly incorporated into pipeline gas, or it can be made into compressed natural gas for automotive fuel, etc. There are many biogas purification technologies. Kaifeng Deere air separation can be designed and selected according to the user's own capital cost and energy utilization goal.
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