沼氣是各種有機物質(zhì)，在隔絕空氣（還原條件），并在適宜的溫度、pH值下，經(jīng)過微生物的發(fā)酵作用產(chǎn)生的一種可燃燒氣體。沼氣中所含硫化氫在使用前因環(huán)保與工藝要求必須去除。
Biogas is a combustible gas produced by microbial fermentation of various organic substances, isolated from air (reducing conditions), and at suitable temperatures and pH values. The hydrogen sulfide contained in biogas must be removed before use due to environmental and process requirements.
因前端污水處理中厭氧發(fā)酵細菌作用的不穩(wěn)定，硫化氫濃度也翻倍增加，使得后端脫硫后沼氣中硫化氫指標大幅升高，不能滿足下游工序的使用要求。
Due to the unstable role of anaerobic fermentation bacteria in the front-end sewage treatment, the concentration of hydrogen sulfide has doubled, resulting in a significant increase in the hydrogen sulfide index in the biogas after desulfurization in the back-end, which cannot meet the requirements of downstream processes.
絡(luò)合鐵脫硫劑具有高硫容、高選擇性的特點。通過采用GLT絡(luò)合鐵脫硫工藝成套裝置取得了很好效果，項目占地面積小，硫化氫指標合格穩(wěn)定、生產(chǎn)成本降低。
Complex iron desulfurizers have the characteristics of high sulfur capacity and high selectivity. Good results have been achieved through the use of a complete set of GLT complex iron desulfurization process, with a small project area, stable and qualified hydrogen sulfide indicators, and reduced production costs.
對于10000~60000 Nm3/d，硫化氫含量為0.5～2.5V%中小規(guī)模沼氣脫硫裝置，國力通能實現(xiàn)成撬化設(shè)備供應(yīng)，在滿足客戶工藝需求的前提下解決客戶占地限制的困擾。
For small-scale biogas desulfurization units with a hydrogen sulfide content of 0.5-2.5V% and a capacity of 10000-60000 Nm3/d, Guoli Tongneng can achieve a supply of modular equipment to solve the problem of land occupation restrictions for customers while meeting their process requirements.
脫硫反應(yīng)原理
Principle of desulfurization reaction
絡(luò)合鐵脫硫工藝利用堿性絡(luò)合鐵催化劑的氧化還原性質(zhì)，吸收原料氣中的H2S。H2S被絡(luò)合鐵催化劑直接氧化生成單質(zhì)硫，絡(luò)合鐵轉(zhuǎn)化為絡(luò)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(luò)合亞鐵，使催化劑富液中的絡(luò)合亞鐵轉(zhuǎn)化為絡(luò)合鐵，從而再生回用。產(chǎn)生的硫磺通過硫磺回收系統(tǒng)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 chelated iron catalyst to generate elemental sulfur, which is then converted into chelated ferrous. During the regeneration process, air is introduced to oxidize the chelated ferrous in the catalyst rich solution, converting the chelated ferrous in the catalyst rich solution into chelated ferrous for regeneration and reuse. The generated sulfur is processed through a sulfur recovery system.
絡(luò)合鐵脫硫反應(yīng)原理如下：
The principle of complex iron desulfurization reaction is as follows:
在總反應(yīng)中，絡(luò)合鐵離子的作用是將吸收反應(yīng)中得到的電子在再生反應(yīng)中轉(zhuǎn)移給單質(zhì)氧。每一個單質(zhì)硫原子的產(chǎn)生需要兩個三價鐵離子參與反應(yīng)。由此，鐵離子盡管參與反應(yīng)，但在總反應(yīng)中并不消耗，而是作為硫化氫和氧氣反應(yīng)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 elemental oxygen in the regeneration reaction. The production of each elemental sulfur atom requires the participation of two trivalent iron ions in the reaction. Therefore, although iron ions participate in the reaction, they are not consumed in the overall reaction, but serve as intermediate electron transfer materials 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
如圖1虛線框所示：自雙膜氣柜過來的沼氣經(jīng)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(yīng)隔室與催化劑中的Fe3+反應(yīng)并轉(zhuǎn)化為單質(zhì)硫，與此同時Fe3+還原成Fe2+ 。
As shown in the dashed box in Figure 1, the biogas from the double membrane gas holder is pressurized by a booster fan and enters the absorption 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(yīng)后的溶液通過自循環(huán)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(huán)回吸收和反應(yīng)隔室繼續(xù)與H2S進行吸收反應(yīng)可脫除酸性氣中99.99%以上H2S。
The solution after the 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+, and then self circulation is used to absorb and continue the absorption reaction with H2S in the reaction chamber, which can remove over 99.99% of H2S from acidic gas.
生成的單質(zhì)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(jīng)氣液分離送出界區(qū)外。廢空氣在脫硫再生塔頂部排出裝置。
The generated elemental sulfur settles in the conical section at the bottom of the desulfurization regeneration tower and 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 boundary area through gas-liquid separation. The waste air is discharged from the top of the desulfurization regeneration tower.
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2023-12-22
