Dry desulfurization: Dry desulfurization is a simple, efficient, and relatively low-cost desulfurization method, generally suitable for biogas desulfurization with low biogas volume and low hydrogen sulfide concentration. The composition of dry process equipment is to place fillers in the container, and the filler layer includes activated carbon, iron oxide, etc. The gas passes through the packing layer in the container at a low flow rate from one end, and hydrogen sulfide (H2S) is oxidized into sulfur or sulfur oxide, which remains in the packing layer. The purified gas is discharged from the other end of the container.
Wet desulfurization: Wet desulfurization can be classified into three types: 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 an alkaline solution as an absorbent and an oxygen carrier as a catalyst to absorb H2S and oxidize it into elemental sulfur. Wet oxidation method is to dissolve desulfurizer in water, and the liquid enters the equipment to be mixed with biogas. Hydrogen sulfide (H2S) in biogas reacts with the liquid to produce elemental sulfur and absorb hydrogen sulfide. The liquid includes sodium hydroxide, calcium hydroxide, sodium carbonate, ferrous sulfate, etc. The mature oxidation desulfurization method has a desulfurization efficiency of over 99.5%.
In large-scale desulfurization projects, wet desulfurization is generally used first for coarse desulfurization, followed by dry desulfurization for fine desulfurization. Before biogas enters the dry desulfurization tower, a condensate water tank or biogas particle filter should be installed. This device can eliminate the particle magazine contained in biogas, so that biogas contains a certain amount of humidity before desulfurization.
When discoloration of the desulfurization agent or excessive system pressure loss is observed, another desulfurization tower should be used alternately. At present, natural ventilation is carried out in the desulfurization tower, and the desulfurization agent is regenerated after the biogas is released. When the regeneration effect is not good, the waste desulfurization agent should be taken out from the bottom of the tower, and the waste filler should be discharged from the bottom. The same volume of fresh desulfurization filler should be added to the reactor.
企业二维码
2023-10-30
鲁公网安备37011202000764号号