Whether the two-stage furnace needs desulfurization depends on:
1 Sulfur content of coal
2 Product gas requirements. If the coal used in the double-stage furnace has a high sulfur content and the sulfide emissions after gasification exceed national standards, desulfurization is required;
In addition, the quality of some products such as fine pottery is greatly affected by the sulfur in the gas, so it is necessary to choose gas with low sulfur content as the heat source. In this case, the gas from the two-stage gas generator must be desulfurized.
Dry desulfurization methods include: using swamp ore or artificial iron oxide as desulfurization agent, and using activated carbon adsorption function for desulfurization.
Wet desulfurization: There are ADA method, arsenic-alkali method, modified ADA method, low-temperature methanol method and ammonia water desulfurization method, as well as naphthoquinone method, polyethylene glycol methyl ether method, cyclobutyl maple method and so on. But to sum up, wet desulfurization can be divided into three types: physical absorption method, chemical absorption method, and oxidation method. Dry desulfurization is commonly used in two-stage gas generator desulfurization.
