There are many types of flue gas desulfurization methods, roughly divided into dry, semi-dry and wet methods, etc. According to the survey, the flue gas desulfurization technology used in major large-scale coal-fired power plants in the future will be mainly wet limestone gypsum method (FGD). This is due to the high efficiency and technology of "limestone gypsum method" desulfurization
The mature and desulfurization by-products have high utilization value, and this method is the leading flue gas desulfurization technology used in thermal power plants around the world.

The by-product of forced oxidation and dehydration of desulfurization using the "limestone gypsum wet process" is called flue gas desulfurization gypsum (DSG). Compared with natural gypsum, desulfurized gypsum has the characteristics of high purity, stable composition, small particle size and few harmful impurities, and is a better quality
Gypsum practice has proved that desulfurization gypsum can replace natural gypsum. It can not only achieve comprehensive utilization of resources, but also bring economic benefits to enterprises.