厌氧发酵产生的沼气内含有一定的硫化氢，硫化氢不但会腐蚀管道及设备，更严重的是如果接触到人员，会造成硫化氢中毒，给人们的身体健康造成危害，严重时可以致人死亡。沼气脱硫的方法有很多，碱液脱硫法是常用的方法之一。该工艺以Na2CO3(NaOH)水溶液为吸收剂，择优选择催化剂，自吸空气喷射氧化槽再生，压滤脱硫泡沫等工艺过程，达到全过程无污染的设计目标。

　　The biogas produced by anaerobic fermentation contains a certain amount of hydrogen sulfide. Hydrogen sulfide not only corrodes pipelines and equipment, but more seriously, if it comes into contact with personnel, it can cause hydrogen sulfide poisoning, posing a threat to people's health and even causing death in severe cases. There are many methods for biogas desulfurization, and alkaline desulfurization is one of the commonly used methods. In this process, Na2CO3 (NaOH) aqueous solution is used as absorbent, catalyst is selected preferentially, regeneration of self-priming air jet oxidation tank, pressure filtration desulfurization foam and other processes are used, so as to achieve the design goal of pollution-free in the whole process.

　　脱硫过程化学反应分为两步，以NaOH碱源为例，反应过程如下所示：步：吸收沼气中的H2SH2S+NaOH=NaHS+H2S第二步：催化剂的催化氧化作用下析出单质硫             NaHS+O2=NaOH+2S

　　The chemical reaction in the desulfurization process is divided into two steps. Taking NaOH alkali source as an example, the reaction process is as follows: Step 1: Absorption of H2SH2S+NaOH=NaHS+H2S from biogas Step 2: Under the catalytic oxidation of the catalyst, elemental sulfur is precipitated NaHS+O2=NaOH+2S

　　1、脱硫工艺描述发酵罐产生的沼气进入湿法脱硫复合塔底部，自下而动，与上部喷淋下的脱硫液逆流充分接触，沼气中的H2S被吸收，净化后的沼气出界区进入下道工序。吸收了H2S的碱液经过催化氧化再生后循环使用，再生得到的硫泡沫经脱硫专用压滤处理制成硫块出售。脱硫液返回系统使用。

　　1. The desulfurization process describes that the biogas produced by the fermentation tank enters the bottom of the wet desulfurization composite tower, flows from bottom to top, and fully contacts with the desulfurization solution sprayed from the upper part in reverse flow. The H2S in the biogas is absorbed, and the purified biogas leaves the boundary area and enters the next process. The alkali liquor absorbed H2S is recycled after catalytic oxidation regeneration, and the regenerated sulfur foam is made into sulfur blocks for sale after desulfurization special filter pressing treatment. The desulfurization solution is returned to the system for use.

　　2、脱硫液流程从脱硫塔底部引出的富液(吸收H2S，生成NaHS)进入富液槽，再经再生泵加压后送再生槽喷射器。富液高速通过喷射器喷嘴时，喷射器吸气室形成负压自动吸入空气，富液与空气两相并流经喷射器喉管、扩散管由尾管排出并由再生槽底部并流向动(第二步反应)。此时，富液中的悬浮硫颗粒被空气浮选形成泡沫飘浮在再生槽上部，溢流硫泡沫槽内。清液与泡沫分离后经液位调节阀进入塔底经脱硫泵加压，进入塔顶，经过吸收硫化氢后的贫液转化成富液并流入塔底，进入富液槽，如此循环。再生槽上部分离出的硫泡沫流入泡沫槽、经泡沫泵送入压滤机，从而得到纯度较高的单质硫。其中产生的清液经降温、活化、沉淀后返回溶液系统。系统工艺用水、纯碱、催化剂的补充在加药槽中完成，每天定期取样检测脱硫液内纯碱、催化剂的浓度，并根据结果确定添加量

　　2. The rich solution (absorbing H2S and generating NaHS) extracted from the bottom of the desulfurization tower in the desulfurization process first enters the rich solution tank, and then is pressurized by the regeneration pump and sent to the regeneration tank injector. When the rich liquid passes through the nozzle of the injector at high speed, negative pressure is formed in the suction chamber of the injector to automatically suck in air. The rich liquid and air flow through the throat and diffusion tube of the injector, and are discharged from the tail pipe and flow upward from the bottom of the regeneration tank (second step reaction). At this time, the suspended sulfur particles in the rich solution are floated by air flotation to form foam and float on the upper part of the regeneration tank, overflowing into the sulfur foam tank. The clear liquid separated from foam enters the tower bottom through the liquid level control valve, is pressurized by the desulfurization pump, and enters the tower top. After absorbing hydrogen sulfide, the lean liquid is converted into rich liquid and flows into the tower bottom, and finally enters the rich liquid tank for circulation. The sulfur foam separated from the regeneration tank flows into the foam tank and is pumped into the filter press by the foam pump to obtain the elemental sulfur with high purity. The resulting clear liquid is cooled, activated, and precipitated before returning to the solution system. The replenishment of system process water, soda ash, and catalyst is completed in the dosing tank. The concentration of soda ash and catalyst in the desulfurization solution is sampled and tested regularly every day, and the amount of addition is determined based on the results

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