沼氣變天然氣，關(guān)鍵在提純脫碳！三種主流技術(shù)一文讀懂

　　The key to transforming biogas into natural gas lies in purification and decarbonization! Understanding Three Mainstream Technologies in One Article

　　很多做環(huán)保、沼氣利用項(xiàng)目的朋友都知道，沼氣想變成能直接使用的天然氣，核心就一個(gè)步驟——提純，說白了就是脫碳，把沼氣里的二氧化碳等雜質(zhì)去掉，提升甲烷純度，達(dá)到天然氣標(biāo)準(zhǔn)。今天就不繞彎子，實(shí)打?qū)嵉馗蠹覈Z嘮，目前行業(yè)內(nèi)最主流的三種沼氣提純技術(shù)，每一種的原理、優(yōu)點(diǎn)、適配場景都講透徹，不玩專業(yè)術(shù)語、不搞虛的，新手也能一看就懂，再也不用為選哪種提純技術(shù)發(fā)愁。

　　Many friends who work on environmental protection and biogas utilization projects know that in order to turn biogas into natural gas that can be directly used, the core step is purification, which means decarbonization, removing impurities such as carbon dioxide from biogas, improving methane purity, and meeting natural gas standards. Today, let's not go around the bush and have a practical talk with everyone. Currently, the three most mainstream biogas purification technologies in the industry are thoroughly explained in terms of their principles, advantages, and adaptation scenarios. Without playing with professional terminology or being vague, even beginners can understand them at a glance, and no longer have to worry about choosing which purification technology to use.

　　這三種主流技術(shù)分別是：變壓吸附、高壓水洗、碳酸丙烯酯脫碳。它們各有各的優(yōu)勢，適配不同的項(xiàng)目規(guī)模和工況，沒有最好的，只有最適合的，咱們一個(gè)個(gè)慢慢嘮，結(jié)合實(shí)際項(xiàng)目場景，幫大家找準(zhǔn)適合自己的那一種。

　　These three mainstream technologies are pressure swing adsorption, high-pressure water washing, and decarbonization of propylene carbonate. They each have their own advantages and are suitable for different project scales and working conditions. There is no best one, only the most suitable one. Let's talk slowly one by one, combine with the actual project scenario, and help everyone find the one that suits themselves.

　　第一種，變壓吸附技術(shù)，這是目前應(yīng)用最廣泛的一種，屬于物理吸附法，原理特別好理解，不用記復(fù)雜的化學(xué)反應(yīng)。它主要是利用分子篩這種特殊材料，在不同壓力下，對(duì)二氧化碳的吸附能力不一樣，從而把二氧化碳和甲烷分離開來——壓力高的時(shí)候，分子篩吸附二氧化碳，壓力低的時(shí)候，再把吸附的二氧化碳解吸出來，循環(huán)使用，就能得到高純度的甲烷。

　　The first type is pressure swing adsorption technology, which is currently the most widely used and belongs to the physical adsorption method. The principle is particularly easy to understand, and there is no need to remember complex chemical reactions. It mainly utilizes the special material of molecular sieve, which has different adsorption abilities for carbon dioxide under different pressures, to separate carbon dioxide and methane - when the pressure is high, molecular sieve adsorbs carbon dioxide, and when the pressure is low, the adsorbed carbon dioxide is desorbed and recycled to obtain high-purity methane.

　　這種技術(shù)的優(yōu)點(diǎn)很突出，系統(tǒng)結(jié)構(gòu)簡單，不用復(fù)雜的設(shè)備，而且自動(dòng)化程度高，啟動(dòng)后基本不用專人全程看管，省人工、省麻煩；最重要的是，提純后的甲烷初期純度就能達(dá)到99%以上，完全符合天然氣使用標(biāo)準(zhǔn)。它特別適合大眾規(guī)模的項(xiàng)目，比如城市污水處理廠、生物天然氣廠，這類項(xiàng)目氣量穩(wěn)定、規(guī)模適中，用變壓吸附技術(shù)，高效又省心，性價(jià)比也最高。

　　The advantages of this technology are prominent, with a simple system structure, no need for complex equipment, and a high degree of automation. After startup, there is basically no need for dedicated personnel to supervise the entire process, saving labor and trouble; The most important thing is that the initial purity of purified methane can reach over 99%, fully meeting the standards for natural gas use. It is particularly suitable for large-scale projects, such as urban sewage treatment plants and biogas plants. These projects have stable gas volume, moderate scale, and use pressure swing adsorption technology, which is efficient, worry free, and cost-effective.

　　第二種，高壓水洗技術(shù)，這種屬于物理吸收法，原理更簡單，就是利用水對(duì)二氧化碳的溶解能力，把二氧化碳從沼氣中吸收去除，從而提升甲烷純度。它的設(shè)備也不復(fù)雜，主要由吸收塔、再生塔和循環(huán)水系統(tǒng)組成，沼氣進(jìn)入吸收塔，和高壓水充分接觸，二氧化碳溶解在水里，干凈的甲烷就分離出來，溶解了二氧化碳的水再進(jìn)入再生塔，釋放出二氧化碳，水可以循環(huán)使用，特別環(huán)保。

　　The second method is high-pressure water washing technology, which belongs to the physical absorption method. The principle is simpler, which uses the solubility of carbon dioxide in water to absorb and remove carbon dioxide from biogas, thereby improving methane purity. Its equipment is not complicated, mainly consisting of an absorption tower, a regeneration tower, and a circulating water system. Biogas enters the absorption tower and comes into full contact with high-pressure water. Carbon dioxide dissolves in the water, and clean methane is separated. The water that has dissolved carbon dioxide then enters the regeneration tower, releasing carbon dioxide. The water can be recycled, which is particularly environmentally friendly.

　　這種技術(shù)最大的優(yōu)點(diǎn)，就是沒有化學(xué)耗材，不用頻繁更換脫硫劑、吸附劑之類的，不僅節(jié)省運(yùn)行成本，還環(huán)保安全，不會(huì)產(chǎn)生二次污染。它更適合中小型沼氣項(xiàng)目，比如餐廚垃圾處理廠、中小型養(yǎng)殖場，這類項(xiàng)目氣量不大、雜質(zhì)含量相對(duì)簡單，用高壓水洗技術(shù)，前期設(shè)備投資不高，后期運(yùn)行也省心，剛好適配工況需求。

　　The biggest advantage of this technology is that there are no chemical consumables, and there is no need to frequently replace desulfurizers, adsorbents, etc. Not only does it save operating costs, but it is also environmentally friendly and safe, and will not produce secondary pollution. It is more suitable for small and medium-sized biogas projects, such as kitchen waste treatment plants and small and medium-sized livestock farms. These projects have low gas volume and relatively simple impurity content, and use high-pressure water washing technology. The initial equipment investment is not high, and the later operation is also worry free, which is just suitable for the working conditions.

　　第三種，碳酸丙烯酯脫碳技術(shù)，這種屬于化學(xué)吸收法，和前兩種不一樣，它是通過化學(xué)反應(yīng)來脫除二氧化碳，核心優(yōu)勢就是脫碳效率極高。咱們直白點(diǎn)說，它能把沼氣中的二氧化碳去除率做到99%以上，而且甲烷損失率特別低，基本不會(huì)浪費(fèi)有用的甲烷，能最大限度提升沼氣的利用率。

　　The third type is the propylene carbonate decarbonization technology, which belongs to the chemical absorption method. Unlike the previous two, it removes carbon dioxide through chemical reactions, and its core advantage is extremely high decarbonization efficiency. To be frank, it can achieve a removal rate of over 99% for carbon dioxide in biogas, and has a particularly low methane loss rate, which basically does not waste useful methane and can maximize the utilization rate of biogas.

　　這種技術(shù)就比較適合高氣量、高濃度二氧化碳的場景，比如大型化肥廠、酒廠、大型養(yǎng)豬場，還有大型市政污水廠的沼氣處理裝置。這類項(xiàng)目沼氣量大，而且二氧化碳濃度高，用前兩種技術(shù)，要么脫碳不徹底，要么運(yùn)行成本太高，而碳酸丙烯酯脫碳技術(shù)，剛好能解決這些痛點(diǎn)，高效脫碳的同時(shí)，保證甲烷的回收率，長期運(yùn)行下來更劃算。

　　This technology is more suitable for scenarios with high gas volume and high concentration of carbon dioxide, such as large-scale fertilizer plants, distilleries, large-scale pig farms, and biogas treatment devices in large-scale municipal sewage treatment plants. This type of project has a large amount of biogas and high concentration of carbon dioxide. Using the first two technologies, either decarbonization is not thorough or the operating cost is too high. However, the propylene carbonate decarbonization technology can solve these pain points, efficiently decarbonize while ensuring methane recovery rate, and is more cost-effective for long-term operation.

　　這里跟大家總結(jié)一下，三種技術(shù)的核心適配場景，記牢這幾點(diǎn)，選的時(shí)候就不會(huì)踩坑：小規(guī)模項(xiàng)目，比如中小型養(yǎng)殖場、餐廚垃圾廠，選高壓水洗，環(huán)保又省錢；大中型集中項(xiàng)目，比如城市污水廠、生物天然氣廠，選變壓吸附，高效自動(dòng)化，適配性強(qiáng)；如果是高氣量、高濃度二氧化碳的工況，比如大型化肥廠、大型養(yǎng)殖場，就選碳酸丙烯酯脫碳，脫碳徹底、甲烷損失少。

　　Here is a summary of the core adaptation scenarios for the three technologies. Remember these points to avoid pitfalls when choosing: for small-scale projects such as small and medium-sized farms and kitchen waste plants, choose high-pressure water washing, which is environmentally friendly and cost-effective; Large and medium-sized centralized projects, such as urban sewage treatment plants and biological natural gas plants, choose pressure swing adsorption, efficient automation, and strong adaptability; If it is a working condition with high gas volume and high concentration of carbon dioxide, such as a large fertilizer plant or a large livestock farm, propylene carbonate decarbonization should be selected to achieve complete decarbonization and minimal methane loss.

　　可能有朋友會(huì)問，我這邊的項(xiàng)目比較特殊，氣量和工況都不一樣，不知道該選哪種怎么辦？大家完全不用擔(dān)心，不用自己瞎琢磨、瞎選型。我們可以根據(jù)你的項(xiàng)目氣量、二氧化碳濃度、實(shí)際工況，為你定制高效的沼氣提純系統(tǒng)解決方案，不管是哪種規(guī)模、哪種工況，都能精準(zhǔn)適配，助力企業(yè)實(shí)現(xiàn)高純度甲烷產(chǎn)出，同時(shí)兼顧節(jié)能減排，既賺錢又環(huán)保。

　　Some friends may ask, my project here is quite special, with different gas volumes and working conditions. I don't know which one to choose and what to do? You don't have to worry at all, don't overthink or make random choices on your own. We can customize an efficient biogas purification system solution for you based on your project's gas volume, carbon dioxide concentration, and actual working conditions. Regardless of the scale or working conditions, it can be accurately adapted to help enterprises achieve high-purity methane production while also considering energy conservation and emission reduction, making both money and environmental protection.

　　其實(shí)沼氣提純脫碳，選對(duì)技術(shù)比什么都重要，選對(duì)了，不僅能保證甲烷純度，還能節(jié)省前期投資和后期運(yùn)行成本，縮短回本周期；選不對(duì)，不僅達(dá)不到天然氣標(biāo)準(zhǔn)，還會(huì)浪費(fèi)沼氣資源，得不償失。很多朋友做項(xiàng)目踩坑，就是因?yàn)闆]選對(duì)適配的提純技術(shù)，盲目跟風(fēng)選熱門技術(shù)，最后不適合自己的工況。

　　In fact, selecting the right technology for biogas purification and decarbonization is more important than anything else. Choosing the right technology not only ensures methane purity, but also saves upfront investment and operational costs, shortening the payback period; Choosing the wrong option not only fails to meet natural gas standards, but also wastes biogas resources, which is not worth the loss. Many friends fall into pitfalls when doing projects because they did not choose the right purification technology, blindly followed popular technologies, and ultimately did not suit their own working conditions.

　　希望今天的分享，能幫到各位做沼氣項(xiàng)目的朋友，徹底讀懂三種主流沼氣提純技術(shù)，找準(zhǔn)適合自己的選型方向，再也不用為提純技術(shù)的事兒糾結(jié)。如果大家還有具體的項(xiàng)目細(xì)節(jié)、選型疑問，也可以私下交流，我們會(huì)一一為你解答，幫你避開選型誤區(qū)，少走彎路，把沼氣項(xiàng)目做得既高效又賺錢。

　　I hope today's sharing can help friends who are doing biogas projects thoroughly understand the three mainstream biogas purification technologies, find the right selection direction for themselves, and no longer have to worry about purification technology. If you have specific project details or selection questions, you can also communicate privately, and we will answer them one by one to help you avoid selection errors, avoid detours, and make biogas projects both efficient and profitable.