1、沼气干法脱硫技术应用较早，应用于沼气的干法脱硫技术是以沼铁矿为脱硫剂的氧化铁脱硫技术，之后，随着yl6809永利氧化铁的研究成功及其生产成本的相对降低，氧化铁脱硫技术也开始被广泛应用。
1. Biogas dry desulfurization technology was applied earlier. The dry desulfurization technology applied to biogas is iron oxide desulfurization technology with biogas iron ore as desulfurizer. Later, with the successful research of biogas desulfurization iron oxide and the relative reduction of production cost, iron oxide desulfurization technology also began to be widely used.
2、氧化铁脱硫技术使用的氧化铁脱硫剂为沼铁矿和人工氧化铁，为增加其孔隙率，脱硫剂以木屑为填充料，再喷洒适量的水和少量熟石灰，反复翻晒制成，其PH值一般为8-9左右，该种脱硫剂脱硫效率较低，必须塔外再生，再生困难，不久便被其他脱硫剂所取代。现在TF型脱硫剂应用较广，该种脱硫剂脱硫效率较高，并可以进行塔内再生。
2. The iron oxide desulfurizer used in iron oxide desulfurization technology is biogas iron ore and artificial iron oxide. In order to increase its porosity, the desulfurizer is made by using wood chips as filler, spraying an appropriate amount of water and a small amount of hydrated lime, and repeatedly turning and drying. Its pH value is generally about 8-9. This kind of desulfurizer has low desulfurization efficiency and must be regenerated outside the tower. It is difficult to regenerate. It will soon be replaced by other desulfurizer. At present, TF desulfurizer is widely used. This desulfurizer has high desulfurization efficiency and can be regenerated in the tower.

氧化铁脱硫的主要机理是催化与吸附作用。当含有H2S的煤气通过氧化铁床层时，在常压下发生放热反应，并在氧化铁表面上被催化氧化成元素硫离子，其生成物被氧化铁吸附，以达到其脱硫目的。为满足用户需要，本方案采用单塔运行。当运行一段时间后，该塔填料已经饱和，失去脱硫能力，需要更换。更换时，用蒸汽吹扫脱硫塔直至煤气检测合格后，打开人孔及卸料孔，更换填料。塔进出口均设置煤气取样嘴，以便化验取样。
The main mechanism of iron oxide desulfurization is catalysis and adsorption. When the gas containing H2S passes through the iron oxide bed, exothermic reaction occurs under normal pressure, and it is catalytically oxidized to elemental sulfur ions on the surface of iron oxide, and its products are adsorbed by iron oxide to achieve its desulfurization purpose. In order to meet the needs of users, this scheme adopts single tower operation. After running for a period of time, the tower packing has been saturated, lost desulfurization capacity and needs to be replaced. During replacement, purge the desulfurization tower with steam until the gas is tested to be qualified, open the manhole and discharge hole and replace the filler. Gas sampling nozzles are set at the inlet and outlet of the tower for testing and sampling.
3、因沼气含水量高，运行过程中，脱硫塔下部会聚集一部分水，正常运行时需每隔一定时间进行作业定期排水。沼气从脱硫塔的一端，经过填料层（主要成分是活性炭和氧化铁）净化后，从另一端流出。硫化氢与填料层的氧化铁发生反应，生成硫化铁；待氧化铁反应结束后，可进行再生。
3. Due to the high water content of biogas, some water will accumulate at the lower part of the desulfurization tower during operation. During normal operation, operation shall be carried out at regular intervals. Biogas flows out from one end of the desulfurization tower after being purified by the packing layer (mainly composed of activated carbon and iron oxide) and from the other end. Hydrogen sulfide reacts with iron oxide in the filler layer to form iron sulfide; Regeneration can be carried out after the iron oxide reaction is completed.