沼氣提純主要目的是去除二氧化碳獲得高純度甲烷。沼氣提純技術多源于天然氣、合成氨變換氣的脫碳技術。由于沼氣的處理量遠小于天然氣或合成氨變換氣，在脫碳技術選擇上應更注重小型化、節能化。目前沼氣提純技術大致可分為：吸附、吸收、膜分離、低溫提純。
The main purpose of biogas purification is to remove carbon dioxide and obtain high-purity methane. Biogas purification technology mostly comes from the decarbonization technology of natural gas and synthetic ammonia. Since the treatment capacity of biogas is far less than that of natural gas or synthetic ammonia, more attention should be paid to miniaturization and energy saving in the selection of decarbonization technology. At present, biogas purification technology can be roughly divided into adsorption, absorption, membrane separation and low-temperature purification.
應用廣泛的沼氣提純技術主要包括：變壓吸附、水洗、有機溶劑物理吸收、有機溶劑化學吸收、高壓膜分離和低溫提純。下表為六種沼氣提純技術的關鍵參數。
Widely used biogas purification technologies mainly include pressure swing adsorption, water washing, physical absorption of organic solvents, chemical absorption of organic solvents, high-pressure membrane separation and low-temperature purification. The following table shows the key parameters of six biogas purification technologies.
加壓水洗法用得多；在德國，變壓吸附法更為廣泛；在荷蘭，加壓水洗法、變壓吸附法和膜分離技術應用都比較普遍。下表為五種沼氣提純技術的經濟比較。
Pressurized water washing method is most used; In Germany, PSA is more extensive; In the Netherlands, pressurized water washing, pressure swing adsorption and membrane separation technology are widely used. The following table shows the economic comparison of five biogas purification technologies.
注：耗電成本（12~18歐分/kWh），耗熱成本（3~5歐分/kWh），水費用為5歐元/m³（含污水處理費）。未考慮進一步的處理成本（如分離硅氧烷或氨氣）。所有值都是基于滿負荷運轉情況。

Note: power consumption cost (12 ~ 18 euro cents / kWh), heat consumption cost (3 ~ 5 euro cents / kWh), water cost is 5 euro / M & sup3; (including sewage treatment fee). Further treatment cost (such as separation of siloxane or ammonia) is not considered. All values are based on full load operation.
沼氣提純成本與原料氣甲烷含量以及成品甲烷含量有關甲烷含量高的原始沼氣提純成本更低。這主要由于能量輸出的增加，而總成本與高能級有關?？梢酝ㄟ^提高效率（降低單位輸出能耗），使用高熱值的原始沼氣降低實際能耗，從而降低成本。
The cost of biogas purification is related to the methane content of feed gas and finished products. The cost of raw biogas purification with high methane content is lower. This is mainly due to the increase of energy output, and the total cost is related to the high energy level. The actual energy consumption can be reduced by improving the efficiency (reducing the energy consumption per unit output) and using the original biogas with high calorific value, so as to reduce the cost.
沼氣提純站的經濟效益還與其他因素有關，例如，可操作性和額定負荷。沼氣提純站的額定運行負荷不僅取決于提純站自身的高度穩定性，而且與原始沼氣流量和后續單元（如充電站和加氣站）的可靠性有關。
The economic benefit of biogas purification station is also related to other factors, such as operability and rated load. The rated operating load of biogas purification station not only depends on the high stability of the purification station itself, but also related to the original biogas flow and the reliability of subsequent units (such as charging station and gas filling station).
停機時間短，設備運行良好，在額定負荷和足夠原料氣的條件下設備能正常連續運行，是一個沼氣提純站高效可用的標準。快速響應時間非常必要，因此由技術供應商提供良好網絡服務至關重要。此外，還可以采用遠程監控，當操作被中斷，技術人員可以直接發現故障，根據故障類型立即采取必要的補救措施，避免了時間延誤，不需要服務技術人員長途跋涉到達現場解決問題。
With short shutdown time and good equipment operation, the equipment can operate normally and continuously under the condition of rated load and sufficient feed gas. It is an efficient and available standard for biogas purification station. Fast response time is very necessary, so it is very important for technology suppliers to provide good network services. In addition, remote monitoring can also be adopted. When the operation is interrupted, technicians can directly find the fault and take necessary remedial measures immediately according to the fault type, so as to avoid time delay and do not need service technicians to travel long distances to the site to solve the problem.
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