絡(luò)合鐵脫硫是一種以絡(luò)合鐵為催化劑脫除硫化氫的濕法氧化法，其特點是將氣體中的H2S直接轉(zhuǎn)化為元素s，吸收氣體中H2S的含量小于20ppm，是一種工藝簡單、工作硫容高、環(huán)保無毒的新型脫硫技術(shù)。克服了傳統(tǒng)脫硫工藝硫容低、脫硫工藝復(fù)雜、旁路鹽生成率高、脫硫效率高等缺點，硫回收率達(dá)99.99%，煙氣二氧化硫含量凈化后降至20mg/Nm3，可滿足日益提高的環(huán)保指標(biāo)。
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.
在復(fù)雜的絡(luò)合鐵脫硫過程中，循環(huán)水溶液的pH值是一個非常重要的可變操作因素，因為水溶液吸收H2S的總量完全取決于水溶液的pH值。PH值是測量水溶液PH值的一種方法，pH值為7表示水溶液呈中性，即不酸不堿；pH值在1到7之間，表明水溶液呈酸性；pH值為7～14表示水溶液呈堿性。反應(yīng)方程式的雙向箭頭表示反應(yīng)處于平衡和穩(wěn)定狀態(tài)。如果H+離子濃度增加，則反應(yīng)向左進(jìn)行，水溶液吸收的H2S總量減少。如果OH-的濃度增加，溶液中的H+會被中和形成水，所以反應(yīng)向右進(jìn)行，水溶液吸收的H2S總量將增加。
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.
一般較高的pH值可以提高反應(yīng)效率，促進(jìn)硫代硫酸根離子的形成，減少對氧的吸收，但也阻礙元素硫的縮合；低pH值會阻礙H2S的吸收。因此，應(yīng)控制pH值為8.0-9.0的弱堿性水溶液。

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.
絡(luò)合鐵脫硫系統(tǒng)利用堿性絡(luò)合鐵催化劑的氧化還原特性吸收酸性氣體中的H2S。H2S被絡(luò)合鐵直接氧化形成元素硫，然后轉(zhuǎn)化為絡(luò)合亞鐵。然后將空氣吹入再生沉淀池，通過空氣氧化堿性吸收劑中的復(fù)合亞鐵，使吸收劑中的復(fù)合亞鐵轉(zhuǎn)化為復(fù)合亞鐵再生利用。同時，硫在再生沉淀池中沉淀分離，形成硫漿，送入過濾器脫水成硫餅。該方法的特點是采用高硫容鐵配合物催化劑，不僅適用于高硫原料氣的處理，而且具有循環(huán)液量小、裝置尺寸小、直接生成元素硫、且無二次污染。
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.