了解沼氣利用的朋友都知道，脫硫是沼氣使用的“第一道門檻”，能去除腐蝕設備的硫化氫雜質(zhì)。但如果想讓沼氣更進一步，升級成可以和天然氣媲美的清潔能源，就必須經(jīng)過另一個關鍵環(huán)節(jié)——提純。很多人會把脫硫和提純混為一談，其實兩者的目標、作用完全不同。今天就專門給大家科普沼氣提純，搞懂它是如何讓普通沼氣“變身”高品質(zhì)能源，以及它在沼氣資源化利用中的核心價值。

　　Friends who are familiar with biogas utilization know that desulfurization is the "first threshold" for biogas use, which can remove hydrogen sulfide impurities that corrode equipment. But if we want to further upgrade biogas into a clean energy source comparable to natural gas, we must go through another key step - purification. Many people confuse desulfurization and purification, but their goals and functions are completely different. Today, we will specifically explain how biogas purification transforms ordinary biogas into high-quality energy and its core value in biogas resource utilization.

　　先明確核心：沼氣提純的核心目的不是去硫，而是去除沼氣中的二氧化碳，提升核心可燃成分——甲烷的純度。咱們可以簡單理解為，脫硫是“除隱患”，解決的是設備腐蝕和安全問題；而提純是“提品質(zhì)”，解決的是沼氣能量密度和適配更高端使用場景的問題。剛從厭氧罐、沼氣池出來的沼氣，除了含硫化氫，還夾雜著大量二氧化碳，甲烷純度通常不高，這也是它無法直接替代天然氣使用的關鍵原因。

　　First, clarify the core: the core purpose of biogas purification is not to remove sulfur, but to remove carbon dioxide from biogas and improve the purity of the core combustible component - methane. We can simply understand desulfurization as "removing hidden dangers" and solving equipment corrosion and safety issues; And purification is about "improving quality", solving the problem of biogas energy density and adapting to higher end usage scenarios. The biogas that has just come out of anaerobic tanks and biogas digesters contains not only hydrogen sulfide but also a large amount of carbon dioxide. The purity of methane is usually not high, which is also the key reason why it cannot directly replace natural gas.

　　那么提純到底有啥重要意義？最直接的就是讓沼氣“更值錢、更好用”。經(jīng)過提純后，甲烷純度能大幅提升，達到天然氣的使用標準，不僅燃燒效率更高，產(chǎn)生的熱量更多，還能適配更多場景。比如未提純的沼氣脫硫后，大多只能用來發(fā)電、燒鍋爐等近距離、低要求的用途；而提純后的沼氣，能接入天然氣管網(wǎng)供居民日常使用，也能作為工業(yè)原料，甚至用于汽車燃料，應用范圍直接擴大好幾倍。對養(yǎng)殖場、酒廠、污水處理廠這些產(chǎn)生沼氣的場所來說，提純更是實現(xiàn)沼氣資源化利用的關鍵，能讓原本的廢棄物產(chǎn)生更高的經(jīng)濟價值。

　　So what is the significance of purification? The most direct way is to make biogas more valuable and useful. After purification, the purity of methane can be significantly improved to meet the standards for natural gas use. Not only does it have higher combustion efficiency and generate more heat, but it can also adapt to more scenarios. For example, after desulfurization of unpurified biogas, it can mostly only be used for close range, low demand applications such as power generation and boiler burning; The purified biogas can be connected to natural gas pipelines for daily use by residents, as well as used as industrial raw materials, and even as automotive fuel, expanding its application scope several times. For places such as farms, distilleries, and sewage treatment plants that produce biogas, purification is the key to realizing the resource utilization of biogas, which can generate higher economic value from the original waste.

　　這里要特別區(qū)分清楚脫硫和提純的流程關系：兩者都屬于沼氣凈化的范疇，但順序有明確要求——必須先脫硫再提純。因為沼氣中的硫化氫不僅腐蝕發(fā)電設備，同樣會損壞提純設備的核心部件，比如膜分離裝置、吸附劑等。如果跳過脫硫直接提純，不僅提純效果差，還會大幅縮短提純設備的使用壽命，增加運維成本。所以完整的高端沼氣凈化流程是：先通過生物脫硫、絡合鐵脫硫或氧化鐵干法脫硫等方式去除硫化氫，再進入提純環(huán)節(jié)。

　　Here, it is important to distinguish the process relationship between desulfurization and purification: both belong to the category of biogas purification, but there is a clear requirement for the order - desulfurization must be carried out first before purification. Because hydrogen sulfide in biogas not only corrodes power generation equipment, but also damages the core components of purification equipment, such as membrane separation devices and adsorbents. If desulfurization is skipped and purification is carried out directly, not only will the purification effect be poor, but it will also significantly shorten the service life of the purification equipment and increase operation and maintenance costs. So the complete high-end biogas purification process is: first remove hydrogen sulfide through biological desulfurization, chelated iron desulfurization, or iron oxide dry desulfurization, and then enter the purification stage.

　　目前行業(yè)內(nèi)常用的沼氣提純技術有三種，各有適配場景。第一種是膜分離技術，利用特殊薄膜對不同氣體的滲透能力差異，把二氧化碳和甲烷分離開，優(yōu)點是操作簡單、能耗低，適合中大規(guī)模的沼氣項目；第二種是PSA變壓吸附技術，通過吸附劑在不同壓力下對二氧化碳的吸附和解吸，實現(xiàn)甲烷提純，純度能做得很高，不過設備投入相對高一些；第三種是高壓水洗技術，利用二氧化碳在高壓水中溶解度更高的特性，將其從沼氣中分離出來，技術成熟、運行穩(wěn)定，適合對純度要求適中的項目。

　　There are currently three commonly used biogas purification technologies in the industry, each with its own adaptation scenarios. The first type is membrane separation technology, which utilizes special membranes to separate carbon dioxide and methane based on their different permeation abilities for different gases. Its advantages include simple operation, low energy consumption, and suitability for medium to large-scale biogas projects; The second method is PSA pressure swing adsorption technology, which uses adsorbents to adsorb and desorb carbon dioxide at different pressures to achieve methane purification with high purity, but the equipment investment is relatively high; The third method is high-pressure water washing technology, which utilizes the higher solubility of carbon dioxide in high-pressure water to separate it from biogas. The technology is mature, stable in operation, and suitable for projects with moderate purity requirements.

　　從應用場景來看，沼氣提純技術早已不是“小眾配置”，在養(yǎng)殖場、酒廠、污水處理廠、生物天然氣廠等場所都有廣泛應用。比如大型養(yǎng)殖場產(chǎn)生的沼氣，經(jīng)過脫硫提純后，能接入當?shù)靥烊粴夤芫W(wǎng)，給周邊居民供氣；污水處理廠的沼氣提純后，可作為自身運營的能源，實現(xiàn)能源自給自足。這不僅解決了沼氣的消納問題，還減少了甲烷直接排放帶來的溫室效應，助力碳減排目標的實現(xiàn)，是典型的“變廢為寶、綠色循環(huán)”模式。

　　From the perspective of application scenarios, biogas purification technology is no longer a "niche configuration" and has been widely used in places such as farms, distilleries, sewage treatment plants, and biogas plants. For example, the biogas produced by large-scale breeding farms can be purified through desulfurization and connected to the local natural gas pipeline network to supply gas to surrounding residents; After the purification of biogas in the sewage treatment plant, it can be used as energy for its own operation, achieving energy self-sufficiency. This not only solves the problem of biogas digestion, but also reduces the greenhouse effect caused by direct methane emissions, helping to achieve carbon reduction goals. It is a typical "turning waste into treasure, green circulation" model.

　　可能有人會問，提純設備投入不低，值得嗎？從長遠來看，答案是肯定的。未提純的沼氣利用范圍窄、經(jīng)濟價值有限；而提純后的沼氣能實現(xiàn)“優(yōu)質(zhì)優(yōu)價”，無論是并網(wǎng)銷售還是自用，都能帶來更高的收益。而且隨著提純技術的不斷成熟，設備成本和運行能耗都在逐步降低，性價比越來越高。對規(guī)模化沼氣項目來說，提純已經(jīng)不是“可選項”，而是提升項目競爭力、實現(xiàn)可持續(xù)發(fā)展的“必選項”。

　　Someone may ask, is it worth investing a lot in purification equipment? In the long run, the answer is yes. The utilization range of unpurified biogas is narrow and its economic value is limited; The purified biogas can achieve "high quality and high price", which can bring higher profits whether it is sold on the grid or for personal use. And with the continuous maturity of purification technology, equipment costs and operating energy consumption are gradually decreasing, and the cost-effectiveness is becoming higher and higher. For large-scale biogas projects, purification is no longer an option, but a necessary choice to enhance project competitiveness and achieve sustainable development.

　　總結(jié)下來，沼氣提純和脫硫雖然都是凈化環(huán)節(jié)，但定位截然不同：脫硫保安全、護設備，是沼氣利用的基礎；提純提品質(zhì)、擴用途，是沼氣升級的核心。正是有了提純技術，沼氣才能從“場地內(nèi)自用的廉價能源”，升級為“可廣泛流通的高品質(zhì)清潔能源”。隨著綠色發(fā)展理念的深入，沼氣提純技術會越來越成熟，在資源化利用、減少污染、碳減排等方面發(fā)揮更大作用。如果大家接觸到沼氣相關項目，不妨多關注一下提純環(huán)節(jié)，就能明白優(yōu)質(zhì)沼氣背后的“升級密碼”。

　　In summary, although both biogas purification and desulfurization are purification processes, their positioning is completely different: desulfurization ensures safety and protects equipment, and is the foundation of biogas utilization; Purification and quality improvement, as well as expansion of applications, are the core of biogas upgrading. It is precisely with purification technology that biogas can be upgraded from a "low-cost energy source for on-site use" to a "high-quality clean energy source that can be widely circulated". With the deepening of the concept of green development, biogas purification technology will become increasingly mature and play a greater role in resource utilization, pollution reduction, carbon emission reduction, and other aspects. If you are exposed to biogas related projects, you may want to pay more attention to the purification process to understand the "upgrade password" behind high-quality biogas.

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