脫硫的方法主要有兩種：濕式脫硫和干式脫硫。
There are two main desulfurization methods: wet desulfurization and dry desulfurization.
（1）濕式脫硫一般在脫硫塔中進(jìn)行，利用堿性液體吸收H2S，常用NaOH、Na2CO3等溶液從塔頂向下噴淋。沼氣自塔底向塔頂排出。堿液與沼氣逆向行下走，不斷將H2S去除，滿足生產(chǎn)需求。其H2S去除率能達(dá)到50%～90%。
(1) Wet desulfurization is generally carried out in the desulfurization tower. Alkaline liquid is used to absorb H2S, and NaOH, Na2CO3 and other solutions are usually sprayed downward from the top of the tower. Biogas is discharged from the tower bottom to the tower top. Alkali liquor and biogas go down in reverse to continuously remove H2S to meet production needs. The H2S removal rate can reach 50% ~ 90%.
（2）干式脫硫在塔內(nèi)裝填有Fe2O3填料，有條狀和片狀，俗稱“海綿鐵”。沼氣自塔下部進(jìn)，上部出。大部分H2S被“海綿鐵”吸附并逐漸飽和。如果要保證生產(chǎn)連續(xù)性，就要及時(shí)更換填料。干式脫硫可以做到去除H2S達(dá)99%，關(guān)鍵要及時(shí)更換填料。
(2) The dry desulfurization tower is filled with Fe2O3 filler in strips and flakes, commonly known as "sponge iron". Biogas enters from the lower part of the tower and exits from the upper part. Most H2S is adsorbed by "sponge iron" and gradually saturated. If the continuity of production is to be ensured, the packing shall be replaced in time. Dry desulfurization can remove H2S up to 99%, and the key is to replace the filler in time.
（3）濕式脫硫的優(yōu)點(diǎn)是脫硫快速，量大，防回火，防燃燒完全。缺點(diǎn)是不能完全脫硫，濕度大。廢液回流，增加水處理難度。
(3) The advantages of wet desulfurization are fast desulfurization, large amount, anti tempering and complete anti combustion. The disadvantage is that it cannot be completely desulfurized and the humidity is high. Waste liquid reflux increases the difficulty of water treatment.
（4）干式脫硫的優(yōu)點(diǎn)是完全脫硫、干燥，脫硫劑可再生使用，防回火。缺點(diǎn)是量小，更換填料臟、累，操作復(fù)雜，且有一定的危險(xiǎn)性。
(4) The advantages of dry desulfurization are complete desulfurization and drying, renewable use of desulfurizer and anti tempering. The disadvantages are small quantity, dirty and tired replacement of packing, complex operation and certain risk.
城市污泥厭氧消化產(chǎn)沼氣中的H2S濃度范圍一般在200～3000mg/m3，高的能達(dá)到10000mg/m3左右，對(duì)于含H2S在3000mg/m3以下的沼氣用干式或者濕式都可以脫硫。對(duì)于3000mg/m3以上H2S含量的沼氣，采用濕、干脫硫串聯(lián)使用，二級(jí)脫硫效果能有把握。干式脫硫一般放在二級(jí)脫硫，對(duì)于要求脫硫達(dá)到100mg/m3以下能起到保證作用。
The concentration range of H2S in biogas produced by anaerobic digestion of municipal sludge is generally 200 ~ 3000mg / m3, and the high can reach about 10000mg / m3. For biogas containing less than 3000mg / m3, dry or wet desulfurization can be used. For biogas with H2S content above 3000mg / m3, wet and dry desulfurization are used in series, and the secondary desulfurization effect can be guaranteed. Dry desulfurization is generally placed in secondary desulfurization, which can ensure that the desulfurization is required to be less than 100mg / m3.
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