絡合鐵脫硫工藝利用堿性絡合鐵催化劑的氧化還原性質，吸收原料氣中的H2S。H2S被絡合鐵催化劑直接氧化生成單質硫，絡合鐵轉化為絡合亞鐵，然后在再生過程中鼓入空氣，以空氣氧化催化劑富液中的絡合亞鐵，使催化劑富液中的絡合亞鐵轉化為絡合鐵，從而再生回用。產生的硫磺通過硫磺回收系統處理。
The complex iron desulfurization process utilizes the redox properties of alkaline complex iron catalysts to absorb H2S from the feed gas. H2S is directly oxidized by a complex iron catalyst to generate elemental sulfur, which is converted into complex ferrous. During the regeneration process, air is blown in to oxidize the complex ferrous in the catalyst rich solution, converting the complex ferrous in the catalyst rich solution into complex ferrous, thereby regenerating and reusing. The generated sulfur is processed through the sulfur recovery system.
絡合鐵脫硫反應原理如下：
The principle of complex iron desulfurization reaction is as follows:
在總反應中，絡合鐵離子的作用是將吸收反應中得到的電子在再生反應中轉移給單質氧。每一個單質硫原子的產生需要兩個三價鐵離子參與反應。由此，鐵離子盡管參與反應，但在總反應中并不消耗，而是作為硫化氫和氧氣反應的中間電子傳遞物，是催化劑體系的組成部分。
In the overall reaction, the role of chelating iron ions is to transfer the electrons obtained from the absorption reaction to the elemental oxygen during the regeneration reaction. The production of each elemental sulfur atom requires two trivalent iron ions to participate in the reaction. Therefore, although iron ions participate in the reaction, they are not consumed in the total reaction, but serve as intermediate electron carriers in the reaction of hydrogen sulfide and oxygen, and are a component of the catalyst system.
脫硫工藝流程
Desulfurization process flow
雙膜氣柜過來的沼氣經增壓風機加壓之后進入脫硫再生塔的吸收脫硫隔室酸氣中的H2S進入反應隔室與催化劑中的Fe3+反應并轉化為單質硫，與此同時Fe3+還原成Fe2+ 。
The biogas from the dual membrane gas tank is pressurized by a booster fan and enters the absorption and desulfurization compartment of the desulfurization regeneration tower. H2S in the acid gas enters the reaction compartment and reacts with Fe3+in the catalyst, converting it into elemental sulfur. At the same time, Fe3+is reduced to Fe2+.
反應后的溶液通過自循環進入氧化隔室，通過風機向氧化再生隔室鼓入空氣中的氧，將Fe2+氧化為Fe3+后再自循環回吸收和反應隔室繼續與H2S進行吸收反應可脫除酸性氣中99.99%以上H2S。
The solution after reaction enters the oxidation chamber through self circulation, and oxygen in the air is blown into the oxidation regeneration chamber through a fan. Fe2+is oxidized to Fe3+, which is then self circulated back for absorption and the reaction chamber continues to absorb and react with H2S to remove over 99.99% of H2S from the acidic gas.
生成的單質硫在脫硫再生塔底部的錐形段沉降后，由硫磺漿泵送至板框過濾機進行硫磺過濾；脫硫后凈化氣經氣液分離送出界區外。廢空氣在脫硫再生塔頂部排出裝置。

After the generated elemental sulfur settles in the conical section at the bottom of the desulfurization regeneration tower, it is pumped by the sulfur slurry to the plate and frame filter for sulfur filtration; The purified gas after desulfurization is sent out of the battery limit through gas-liquid separation. The waste air is discharged from the top of the desulfurization regeneration tower.
技術特點
Technical characteristics
成套絡合鐵脫硫技術對于沼氣凈化具有如下優點：
The complete set of complex iron desulfurization technology has the following advantages for biogas purification:
（1）原料氣脫硫中硫化氫一步轉化為硫磺，凈化氣硫化氫濃度低于10ppm。
(1) In the desulfurization of raw gas, hydrogen sulfide is converted into sulfur in one step, and the concentration of hydrogen sulfide in the purified gas is less than 10ppm.
（2）裝置操作彈性大，硫化氫濃度從0.5～2V%波動均不影響裝置運行。
(2) The device has high operational flexibility, and fluctuations in hydrogen sulfide concentration from 0.5 to 2V% do not affect the operation of the device.
（3）吸收、再生及硫磺沉降均在一個設備中，設計一體化，工藝簡單，節省占地。
(3) The absorption, regeneration, and sulfur deposition are all in one equipment, with integrated design and simple process, saving land.
（4）催化劑環境友好，脫硫過程無“三廢”排放。
(4) The catalyst is environmentally friendly, and there are no "three wastes" emissions during the desulfurization process.
（5）運行可靠，保證長周期穩定運行。
(5) Reliable operation, ensuring long-term stable operation.
（6）采用橇裝方式供貨，可根據需要移動。
(6) Supplied in a skid mounted manner and can be moved as needed.
（7）每立方沼氣脫硫系統的單位運行成本可低至0.03～0.07元。
(7) The unit operating cost of each cubic meter of biogas desulfurization system can be as low as 0.03-0.07 yuan.