干法脱硫 干法脱除沼气中硫化氢（H2S）的反应基本原理是特定填料（沼气专用脱硫剂），以O2使H2S 氧化成硫或硫氧化物的一种方法，也可称为干式氧化法。干法的基本构成是，在特制的脱硫塔中放入填料。气体以低流速从一端经过脱硫塔内填料层，把硫化氢（H2S）吸附或吸收反应成硫化物或多硫化物后，余留在填料层中，净化后气体从脱硫塔另一端排出，实现脱硫处理的目的。

Dry desulfurization is a way to remove hydrogen sulfide (H2S) from biogas by dry desulfurization. The basic principle is the specific filler (special desulfurizer for biogas) and the way to oxidize H2S to sulfur or sulfur oxides by O2. It can also be called dry type oxidation. The basic composition of the dry method is to put the packing in the special desulfuration tower. The gas from one end to the low flow rate after desulfurization tower filler layer, hydrogen sulfide (H2S) adsorption or absorption reaction into sulfide or polysulfide, remaining in the filler layer, the purified gas is discharged from the other end of the desulfurization tower, to achieve the purpose of desulfurization treatment.