沼氣脫硫器具技術(shù)成熟，運(yùn)行可靠性高。操作彈性大，對(duì)煤種變化的適應(yīng)性強(qiáng)。脫硫器工藝吸收效果好，吸收劑利用率高，設(shè)計(jì)脫硫率的實(shí)現(xiàn)；鈉堿循環(huán)利用，損耗少，運(yùn)行成本低；鈉堿吸收劑反應(yīng)活性高、吸收速度快，可采用低液氣比，從而既可降低運(yùn)行費(fèi)用；脫硫渣，溶解度極小，無(wú)二次污染，可綜合利用。如氣體純度要求更高可使用雙塔。
The biogas desulfurization equipment has mature technology and high operation reliability. Large operation flexibility and strong adaptability to coal type change. Desulfurizer process has good absorption effect, high utilization rate of absorbent, and realization of designed desulfurization rate; Sodium and alkali are recycled, with less loss and low operation cost; The sodium-alkali absorbent has high reaction activity and fast absorption speed, and can adopt low liquid-gas ratio, which can reduce the operating cost; Desulfurized slag has low solubility, no secondary pollution and can be comprehensively utilized. If the gas purity requirement is higher, double towers can be used.
沼氣脫硫方式工藝
Biogas desulfurization process
沼氣在脫硫塔內(nèi)流動(dòng)的方向可分為兩種。一種是沼氣自下而動(dòng)，為了防止冷凝水沉積在塔頂部而使脫硫劑受濕，通?？稍陧敳棵摿騽┥箱佉欢ê穸鹊乃楣杷徜X纖維或其他多孔性填料，將冷凝水阻隔。另一種是氣流自上而下流動(dòng)，塔內(nèi)產(chǎn)生的冷凝水都聚積在塔底部，可通過(guò)排污閥定期排除。脫硫塔底部應(yīng)設(shè)置排污閥門(mén)和沼氣泄壓等裝置。
The flow direction of biogas in the desulfurization tower can be divided into two types. One is that biogas moves from the bottom. In order to prevent condensate from depositing on the top of the tower and wetting the desulfurizer, a certain thickness of crushed aluminum silicate fiber or other porous filler can be paved on the top desulfurizer to block the condensate. The other is that the air flow flows from top to bottom, and the condensed water generated in the tower accumulates at the bottom of the tower, which can be regularly discharged through the blowdown valve. The bottom of desulfurization tower shall be equipped with blowdown valve and biogas safety pressure relief device.
氧化鐵脫硫劑的更換時(shí)間應(yīng)根據(jù)脫硫劑的活性和裝填量、沼氣中硫化氫含量和沼氣處理量來(lái)確定。一旦脫硫劑失去活性，則需要將脫硫劑從塔內(nèi)卸出，攤曬在空地上，用堿液或氨水將pH調(diào)整8?9,利用空氣中的氧，進(jìn)行自然再生。大型沼氣干法脫硫裝置，應(yīng)設(shè)置機(jī)械設(shè)備裝卸脫硫劑。
The replacement time of iron oxide desulfurizer shall be determined according to the activity and loading capacity of desulfurizer, hydrogen sulfide content in biogas and biogas treatment capacity. Once the desulfurizer loses its activity, it is necessary to unload the desulfurizer from the tower, spread it on the open ground, and adjust the pH to 8? 9. Use the oxygen in the air for natural regeneration. Mechanical equipment shall be set for loading and unloading desulfurizer in large biogas dry desulfurization device.
濕法脫硫在大型的脫硫工程中，一般采用先用濕法進(jìn)行粗脫硫，之后再通過(guò)干法進(jìn)行精脫硫。沼氣濕法脫硫可以歸納分為物理吸收法、化學(xué)吸收法和氧化法三種。物理和化學(xué)方法存在硫化氫再處理問(wèn)題，氧化法是以堿性溶液為吸收劑，并加人載氧體為催化劑，吸收硫化氫，并將其氧化成單質(zhì)硫。濕法氧化法是把脫硫劑溶解在水中，液體進(jìn)入設(shè)備，與沼氣混合，沼氣中的硫化氫與液體產(chǎn)生氧化反應(yīng)，生成單質(zhì)硫。
In large desulfurization projects, wet desulfurization is generally used for coarse desulfurization, followed by dry desulfurization for fine desulfurization. The wet desulfurization of biogas can be divided into physical absorption method, chemical absorption method and oxidation method. There is a problem of hydrogen sulfide reprocessing in physical and chemical methods. The oxidation method uses alkaline solution as absorbent and human oxygen carrier as catalyst to absorb hydrogen sulfide and oxidize it into elemental sulfur. The wet oxidation method is to dissolve the desulfurizer in water, and the liquid enters the equipment and mixes with the biogas. The hydrogen sulfide in the biogas will react with the liquid to generate elemental sulfur.
生物脫硫沼氣生物脫硫工藝是一種的沼氣脫硫工藝，是在生物的作用下，將硫化氫氧化成單質(zhì)硫的一種方法。生物脫硫方法主要是利用無(wú)色硫細(xì)菌，如氧化硫硫桿細(xì)菌、氧化亞鐵硫桿細(xì)菌等，在微氧條件下將硫化氫氧化成單質(zhì)硫，單質(zhì)硫經(jīng)過(guò)沉淀分離從而達(dá)到去除硫的目的。這種脫硫方法已經(jīng)在德國(guó)沼氣脫硫中廣泛使用，在國(guó)內(nèi)某些工程中已有采用。其優(yōu)點(diǎn)是：不需要催化劑、不需要處理化學(xué)污泥，產(chǎn)生很少的生物污泥、能耗低、可回收_質(zhì)硫、去除。
Biological desulfurization biogas biological desulfurization process is a kind of biogas desulfurization process. It is a method to oxidize hydrogen sulfide into elemental sulfur under the action of biology. The biological desulfurization method mainly uses colorless sulfur bacteria, such as sulfur oxide sulfur rod bacteria and ferrous oxide sulfur rod bacteria, to oxidize hydrogen sulfide into elemental sulfur under micro-oxygen conditions, and the elemental sulfur is precipitated and separated to achieve the purpose of sulfur removal. This desulfurization method has been widely used in biogas desulfurization in Germany and has been used in some domestic projects. Its advantages are: no catalyst, no chemical sludge treatment, little biological sludge, low energy consumption, recyclable_ Sulfur quality and removal.
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