(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) 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) 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) 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.
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.
The above is the detailed introduction of biogas desulfurization, which I hope will be helpful to you If you have any questions, please contact us We will provide you with professional service http://lhgdst.com
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