沼氣作為一種可再生新能源正在被越來越多地使用，但是因為沼氣本身是一種混合氣體，而且其中含有劇毒的硫化氫氣體，所以環保標準嚴格限制每立方沼氣中硫化氫的含量不得超過20mg。

Biogas, as a renewable new energy source, is increasingly being used. However, because biogas is a mixture of gases and contains highly toxic hydrogen sulfide gas, environmental standards strictly limit the content of hydrogen sulfide per cubic meter of biogas to no more than 20mg.

同時因為在厭氧發酵的過程中，尤其是在中高發酵溫度下，沼氣中不僅混有大量的硫化氫，還會混有大量的水蒸氣，水和硫化氫結合就會形成氫硫酸，會加速金屬管道、閥門和流量計的腐蝕和結垢。

At the same time, during anaerobic fermentation, especially at medium and high fermentation temperatures, biogas not only contains a large amount of hydrogen sulfide, but also a large amount of water vapor. The combination of water and hydrogen sulfide will form hydrosulfuric acid, which will accelerate the corrosion and scaling of metal pipelines, valves, and flow meters.

此外，硫化氫燃燒后產生的二氧化硫與水蒸氣結合形成亞硫酸，同樣會導致設備金屬表面腐蝕，并污染大氣，影響人體健康。因此在使用沼氣前必須去除硫化氫氣體。

In addition, the sulfur dioxide produced after the combustion of hydrogen sulfide combines with water vapor to form sulfite, which can also cause corrosion on the metal surface of equipment and pollute the atmosphere, affecting human health. Therefore, hydrogen sulfide gas must be removed before using biogas.

目前比較常見的脫硫方式有三種，分別是干法脫硫、濕法脫硫以及生物脫硫，今天就跟大家聊聊這三種脫硫方法有什么不同。

There are currently three common desulfurization methods, namely dry desulfurization, wet desulfurization, and biological desulfurization. Today, we will talk about the differences among these three desulfurization methods.

一、干法脫硫

1、 Dry desulfurization

干法脫硫是出現比較早的一種脫硫方法，其設備簡單，造價低廉，使用方便，而且使用過程中不需要人員值守，只需要定期更換脫硫劑即可。干法脫硫的脫硫劑需要定期進行循環再生，所以脫硫設備都是一用一備，交替運行。

Dry desulfurization is an early desulfurization method that has simple equipment, low cost, convenient use, and does not require personnel to be on duty during use. It only requires regular replacement of the desulfurization agent. The desulfurizer for dry desulfurization needs to be regularly recycled, so the desulfurization equipment is operated alternately with one in use and one as a backup.

干法脫硫的缺點是脫硫率會逐漸下降，并且要定期更換一批脫硫劑，這也導致干法脫硫的運行費用比較高。

The disadvantage of dry desulfurization is that the desulfurization rate will gradually decrease and a batch of desulfurizers needs to be replaced regularly, which also leads to higher operating costs for dry desulfurization.

二、濕法脫硫

2、 Wet desulfurization

濕法脫硫設備可以長期不停運行，脫硫工作更為穩定連續，并且運行費用低，但是設備需要定期進行保養，而且濕法脫硫的工藝較為復雜，需要專業技術人員進行值守。

Wet flue gas desulfurization equipment can operate continuously for a long time, making desulfurization work more stable and continuous with low operating costs. However, the equipment needs regular maintenance, and the process of wet flue gas desulfurization is complex, requiring professional technical personnel to be on duty.

三、生物脫硫

3、 Biological desulfurization

生物脫硫是最新的脫硫工藝，該方法的硫化氫去除率可以高達98.5%，并且能夠處理的硫化氫濃度也可以高達15%（15000ppm），而且和干法以及濕法脫硫相比，運行成本更低。

Biological desulfurization is the latest desulfurization process, with a hydrogen sulfide removal rate of up to 98.5% and a hydrogen sulfide concentration of up to 15% (15000ppm) that can be processed. Compared with dry and wet desulfurization, this method has lower operating costs.

生物脫硫的設備自動化程度很高，并且設有多種安全防護裝置，可以實現遠程在線監測自動化運行，并且維護工作也比較少。

The equipment for biological desulfurization has a high degree of automation and is equipped with various safety protection devices, which can achieve remote online monitoring and automated operation, and maintenance work is also relatively less.

一般來說，濕法脫硫和生物脫硫多應用于處理量比較大的大型沼氣工程，而民用沼氣池因為場地和處理量都比較小，所以干法脫硫更加合適。

Generally speaking, wet flue gas desulfurization and biological flue gas desulfurization are mostly applied to large-scale biogas projects with relatively large processing capacity, while civilian biogas digesters are more suitable for dry flue gas desulfurization due to their smaller site and processing capacity.