Dry desulfurization process description
Aug 07, 2025
Dry desulfurization mainly includes main components such as desulfurization tower reaction tower body, desulfurizer packing, loading and unloading hopper, operating platform, lifting device, connecting flange, etc.
Before entering the dry desulfurization tower, a condensate tank or a biogas particle filter should be installed. This device can eliminate particle impurities in biogas, ensure a certain humidity of biogas, and prevent backfire.
After the biogas is dehydrated in the condensate tank, it enters the dry desulfurization tower from the bottom. A special iron oxide desulfurizer is used to absorb hydrogen sulfide in the gas, converting it into iron sulfide and adsorbing it in the packing layer, thereby removing hydrogen sulfide from the biogas and achieving good fine desulfurization effect.
The desulfurization reaction equation is as follows:
Fe2O3 • H2O + 3 H2S = Fe2S3 + 4 H2O
The regeneration reaction equation is as follows:
Fe2S3 + 3/2 O2 + 3 H2O = Fe2O3 • H2O + 2 H2O + 3 S
The desulfurization tower is usually designed with one in use and one as backup. It can be determined whether the desulfurizer needs to be replaced by observing the discoloration of the desulfurizer inside the tower or the change in system pressure loss. When discoloration of the desulfurizer or significant increase in system pressure loss is observed, another desulfurization tower should be used alternately.
The desulfurizer uses iron oxide hydrate, which is brownish red or black brown in color and has a density of about 0.8kg/L. The desulfurizer is a porous material that is effective for a long time before the reacted sulfur blocks the surface of the iron oxide particles.
Before entering the dry desulfurization tower, a condensate tank or a biogas particle filter should be installed. This device can eliminate particle impurities in biogas, ensure a certain humidity of biogas, and prevent backfire.
After the biogas is dehydrated in the condensate tank, it enters the dry desulfurization tower from the bottom. A special iron oxide desulfurizer is used to absorb hydrogen sulfide in the gas, converting it into iron sulfide and adsorbing it in the packing layer, thereby removing hydrogen sulfide from the biogas and achieving good fine desulfurization effect.
The desulfurization reaction equation is as follows:
Fe2O3 • H2O + 3 H2S = Fe2S3 + 4 H2O
The regeneration reaction equation is as follows:
Fe2S3 + 3/2 O2 + 3 H2O = Fe2O3 • H2O + 2 H2O + 3 S
The desulfurization tower is usually designed with one in use and one as backup. It can be determined whether the desulfurizer needs to be replaced by observing the discoloration of the desulfurizer inside the tower or the change in system pressure loss. When discoloration of the desulfurizer or significant increase in system pressure loss is observed, another desulfurization tower should be used alternately.
The desulfurizer uses iron oxide hydrate, which is brownish red or black brown in color and has a density of about 0.8kg/L. The desulfurizer is a porous material that is effective for a long time before the reacted sulfur blocks the surface of the iron oxide particles.
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