Biogas dry desulfurization is a simple, efficient and relatively low-cost desulfurization method. It is generally suitable for biogas desulfurization with small amount of biogas and low concentration of hydrogen sulfide. The basic principle of the equipment for removing hydrogen sulfide (H2S) from biogas gas by dry method is a method of oxidizing H2S into sulfur or sulfur oxide with O2, which can also be called dry oxidation method. The composition of dry process equipment is to put filler in a container, and the filler layer includes activated carbon, iron oxide, etc. The gas passes through the packing layer in the container at a low flow rate. After hydrogen sulfide (H2S) is oxidized into sulfur or sulfur oxide, it remains in the packing layer, and the purified gas is discharged from the other end of the container.

沼气干式脱硫主要包括主体钢结构、脱硫剂填料、观察窗、压力表、温度表等组件。脱硫塔通常设计为一用一备，交替使用，即一个脱硫，一个再生。 含有硫化氢(H2S)的沼气进入脱硫塔底部，在穿过脱硫填料层到达顶端的过程中，H2S与脱硫剂发生以下的化学反应：

Biogas Dry Desulfurization mainly includes main steel structure, desulfurizer filler, observation window, pressure gauge, thermometer and other components. The desulfurization tower is usually designed as one for use and one for standby, which is used alternately, that is, one desulfurization and one regeneration. The biogas containing hydrogen sulfide (H2S) enters the bottom of the desulfurization tower. In the process of passing through the desulfurization packing layer to the top, H2S and desulfurizer have the following chemical reactions:

一、Fe2O3·H2O+3H2S=Fe2S3+4H2O（脱硫）

1、 Fe2O3 · H2O + 3h2s = fe2s3 + 4H2O (desulfurization)

二、Fe2S3+3/2O2+3H2O=Fe2O3·H2O+2H2O+3S（再生）

2、 Fe2s3 + 3 / 2O2 + 3H2O = Fe2O3 · H2O + 2H2O + 3S (regeneration)

含有硫化氢的沼气首先与底部入口处荷载相对高的脱硫剂反应，反应器上部是负载低的脱硫剂层，通过设计良好的沼气空速和线速，干式脱硫能到达良好的精脱硫效果。

The biogas containing hydrogen sulfide first reacts with the desulfurizer with relatively high load at the bottom inlet, and the upper part of the reactor is the desulfurizer layer with low load. Through the design of good biogas space velocity and linear velocity, dry desulfurization can achieve good fine desulfurization effect.

在沼气进入干式脱硫塔之前，应设置有冷凝水罐或沼气颗粒过滤器。该装置可以除掉沼气中夹杂的颗粒杂质，并使得沼气在进入脱硫前含有一定湿度。

Condensate tank or biogas particle filter shall be set before biogas enters dry desulfurization tower. The device can remove the particle impurities contained in the biogas and make the biogas contain a certain humidity before entering the desulfurization.

当观察到脱硫剂变色，或系统压力损失过大时，应交替使用另一个脱硫塔。当前的脱硫塔在沼气放空后，进行自然通风，对脱硫剂进行再生。当再生效果不佳时，应从塔体底部将废弃的脱硫剂排除，在底部排放废弃填料的同时，相同体积的新鲜脱硫填料加入反应器中。

When the color change of desulfurizer is observed or the system pressure loss is too large, another desulfurization tower shall be used alternately. The current desulfurization tower will conduct natural ventilation and regenerate the desulfurizer after the biogas is vented. When the regeneration effect is poor, the waste desulfurizer shall be removed from the bottom of the tower. While the waste filler is discharged from the bottom, the same volume of fresh desulfurizing filler shall be added to the reactor.

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