络合铁脱硫是一种以络合铁为催化剂脱除硫化氢的湿法氧化法，其特点是将气体中的H2S直接转化为元素s，吸收气体中H2S的含量小于20ppm，是一种工艺简单、工作硫容高、环保无毒的新型脱硫技术。克服了传统脱硫工艺硫容低、脱硫工艺复杂、旁路盐生成率高、脱硫效率高等缺点，硫回收率达99.99%，烟气二氧化硫含量净化后降至20mg/Nm3，可满足日益提高的环保指标。
Complex iron desulfurization is a wet oxidation method for removing hydrogen sulfide with complex iron as catalyst. It is characterized by the direct conversion of H2S in the gas into element s, and the content of H2S in the absorbed gas is less than 20ppm. It is a new desulfurization technology with simple process, high working sulfur capacity, environmental protection and non toxicity. It overcomes the shortcomings of traditional desulfurization process, such as low sulfur capacity, complex desulfurization process, high bypass salt generation rate and high desulfurization efficiency. The sulfur recovery rate is 99.99%, and the sulfur dioxide content in flue gas is reduced to 20mg / Nm3 after purification, which can meet the increasing environmental protection indicators.
在复杂的络合铁脱硫过程中，循环水溶液的pH值是一个非常重要的可变操作因素，因为水溶液吸收H2S的总量完全取决于水溶液的pH值。PH值是测量水溶液PH值的一种方法，pH值为7表示水溶液呈中性，即不酸不碱；pH值在1到7之间，表明水溶液呈酸性；pH值为7～14表示水溶液呈碱性。反应方程式的双向箭头表示反应处于平衡和稳定状态。如果H+离子浓度增加，则反应向左进行，水溶液吸收的H2S总量减少。如果OH-的浓度增加，溶液中的H+会被中和形成水，所以反应向右进行，水溶液吸收的H2S总量将增加。
In the complex complex iron desulfurization process, the pH value of circulating aqueous solution is a very important variable operating factor, because the total amount of H2S absorbed by aqueous solution completely depends on the pH value of aqueous solution. PH value is a method to measure the pH value of aqueous solution. PH value of 7 means that the aqueous solution is neutral, that is, it is neither acid nor alkali; The pH value is between 1 and 7, indicating that the aqueous solution is acidic; A pH value of 7 ~ 14 indicates that the aqueous solution is alkaline. The two-way arrow in the reaction equation indicates that the reaction is in equilibrium and stable state. If the H + ion concentration increases, the reaction proceeds to the left and the total amount of H2S absorbed by the aqueous solution decreases. If the concentration of OH - increases, H + in the solution will be neutralized to form water, so the reaction proceeds to the right, and the total amount of H2S absorbed by the aqueous solution will increase.
一般较高的pH值可以提高反应效率，促进硫代硫酸根离子的形成，减少对氧的吸收，但也阻碍元素硫的缩合；低pH值会阻碍H2S的吸收。因此，应控制pH值为8.0-9.0的弱碱性水溶液。

Generally, higher pH value can improve the reaction efficiency, promote the formation of thiosulfate ions, reduce the absorption of oxygen, but also hinder the condensation of elemental sulfur; Low pH value will hinder the absorption of H2S. Therefore, the weak alkaline aqueous solution with pH value of 8.0-9.0 should be controlled.
络合铁脱硫系统利用碱性络合铁催化剂的氧化还原特性吸收酸性气体中的H2S。H2S被络合铁直接氧化形成元素硫，然后转化为络合亚铁。然后将空气吹入再生沉淀池，通过空气氧化碱性吸收剂中的复合亚铁，使吸收剂中的复合亚铁转化为复合亚铁再生利用。同时，硫在再生沉淀池中沉淀分离，形成硫浆，送入过滤器脱水成硫饼。该方法的特点是采用高硫容铁配合物催化剂，不仅适用于高硫原料气的处理，而且具有循环液量小、装置尺寸小、直接生成元素硫、且无二次污染。
The complex iron desulfurization system uses the redox characteristics of basic complex iron catalyst to absorb H2S in acid gas. H2S is directly oxidized by complex iron to form elemental sulfur, which is then converted to complex ferrous. Then, air is blown into the regeneration sedimentation tank to oxidize the composite ferrous in the alkaline absorbent through air, so as to convert the composite ferrous in the absorbent into composite ferrous for recycling. At the same time, sulfur is precipitated and separated in the regeneration sedimentation tank to form sulfur slurry, which is sent to the filter for dehydration into sulfur cake. The method is characterized by the use of high sulfur iron containing complex catalyst, which is not only suitable for the treatment of high sulfur feed gas, but also has the advantages of small circulating liquid volume, small device size, direct generation of elemental sulfur and no secondary pollution.