沼气作为一种可再生新能源正在被越来越多地使用，但是因为沼气本身是一种混合气体，而且其中含有剧毒的硫化氢气体，所以环保标准严格限制每立方沼气中硫化氢的含量不得超过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.

同时因为在厌氧发酵的过程中，尤其是在中高发酵温度下，沼气中不仅混有大量的硫化氢，还会混有大量的水蒸气，水和硫化氢结合就会形成氢硫酸，会加速金属管道、阀门和流量计的腐蚀和结垢。

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，硫化氢燃烧后产生的二氧化硫与水蒸气结合形成亚硫酸，同样会导致设备金属表面腐蚀，并污染大气，影响人体健康。因此在使用沼气前必须去除硫化氢气体。

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.

目前比较常见的脱硫方式有三种，分别是干法脱硫、湿法脱硫以及生物脱硫，今天就跟大家聊聊这三种脱硫方法有什么不同。

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、干法脱硫

1、 Dry desulfurization

干法脱硫是出现比较早的一种脱硫方法，其设备简单，造价低廉，使用方便，而且使用过程中不需要人员值守，只需要定期更换脱硫剂即可。干法脱硫的脱硫剂需要定期进行循环再生，所以脱硫设备都是一用一备，交替运行。

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.

干法脱硫的缺点是脱硫率会逐渐下降，并且要定期更换一批脱硫剂，这也导致干法脱硫的运行费用比较高。

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、湿法脱硫

2、 Wet desulfurization

湿法脱硫设备可以长期不停运行，脱硫工作更为稳定连续，并且运行费用低，但是设备需要定期进行保养，而且湿法脱硫的工艺较为复杂，需要专业技术人员进行值守。

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、生物脱硫

3、 Biological desulfurization

生物脱硫是最新的脱硫工艺，该方法的硫化氢去除率可以高达98.5%，并且能够处理的硫化氢浓度也可以高达15%（15000ppm），而且和干法以及湿法脱硫相比，运行成本更低。

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.

生物脱硫的设备自动化程度很高，并且设有多种安全防护装置，可以实现远程在线监测自动化运行，并且维护工作也比较少。

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.

一般来说，湿法脱硫和生物脱硫多应用于处理量比较大的大型沼气工程，而民用沼气池因为场地和处理量都比较小，所以干法脱硫更加合适。

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.