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干法脱硫是一种低成本的脱硫方式

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2023-11-09

干法脱硫是一种简易、高效、低成本的脱硫方式，一般适合用于沼气量小，硫化氢浓度低的沼气脱硫。干法脱除沼气气体中硫化氢（H2S）的设备基本原理是以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。干法设备的构成是，在一个容器内放入填料，填料层有活性炭、氧化铁等。气体以低流速从一端经过容器内填料层，硫化氢（H2S）氧化成硫或硫氧化物后，余留在填料层中，净化后气体从容器另一端排出。

Dry desulfurization is a simple, efficient, and low-cost desulfurization method that is generally suitable for biogas desulfurization with small biogas volume and low hydrogen sulfide concentration. The basic principle of the equipment for dry removal of hydrogen sulfide (H2S) from biogas gas is a method of using O2 to oxidize H2S into sulfur or sulfur oxides, also known as dry oxidation method. The composition of dry process equipment is to place fillers in a container, with a filler layer consisting of activated carbon, iron oxide, etc. The gas passes through the packing layer inside the container at a low flow rate, and hydrogen sulfide (H2S) is oxidized to sulfur or sulfur oxides, remaining in the packing layer. After purification, the gas is discharged from the other end of the container.

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：
沼气脱硫

Dry desulfurization mainly includes components such as the main steel structure, desulfurizer filler, observation window, pressure gauge, temperature gauge, etc. Desulfurization towers are usually designed as one for use and one for backup, with alternating use, i.e. one for desulfurization and one for regeneration. The biogas containing hydrogen sulfide (H2S) enters the bottom of the desulfurization tower and undergoes the following chemical reactions with the desulfurization agent during the process of passing through the desulfurization filler layer and reaching the top:

步: Fe2O3 · H2O + 3 H2S = Fe2S3 + 4 H2O （脱硫）

Step 1: Fe2O3 · H2O+3 H2S=Fe2S3+4 H2O (desulfurization)

第二步: Fe2S3 + 3/2 O2 + 3 H2O = Fe2O3 · H2O + 2 H2O + 3 S（再生）

Step 2: Fe2S3+3/2 O2+3 H2O=Fe2O3 · H2O+2 H2O+3 S (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 a desulfurization agent with a relatively high load at the bottom inlet. The upper part of the reactor is a desulfurization agent layer with a low load. By designing a good biogas airspeed and line speed, dry desulfurization can achieve good precision 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。该装置可以消除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。

Before biogas enters the dry desulfurization tower, a condensate tank or biogas particle filter should be installed. This device can eliminate particle impurities mixed in biogas and make biogas contain a certain amount of humidity before entering 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 discoloration of the desulfurization agent or excessive pressure loss in the system is observed, another desulfurization tower should be used alternately. The current desulfurization tower undergoes natural ventilation and regeneration of the desulfurization agent after the biogas is vented. When the regeneration effect is poor, the waste desulfurizer should be discharged from the bottom of the tower body. At the same time as the waste filler is discharged from the bottom, fresh desulfurized filler of the same volume should be added to the reactor.

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This article is provided by China Biogas Desulfurization Co., Ltd. Our website is: https://www.hneee.net We will provide you with wholehearted enthusiasm and welcome your visit!

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