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Power plant desulfurization typically involves removing sulfur dioxide (SO2) emissions from the flue gas of coal-fired power plants. One common approach to this is to use limestone or lime to react with the SO2 and produce calcium sulfite or sulfate, which can be easily disposed of or recycled.

 

To efficiently use limestone or lime for desulfurization, they must be pulverized to a fine powder and injected into the flue gas stream. This process requires specialized equipment, such as pulverizers, mills, or grinders.

 

Coal-fired desulfurization methods in power plants can be divided into three categories: pre-combustion, during-combustion and post-combustion according to the sequence of the desulfurization process. Coal desulfurization before combustion mainly includes coal washing, chemical desulfurization, and coal conversion; during combustion, it is called desulfurization in the furnace and mainly includes circulating fluidized bed and furnace accompanying combustion desulfurization; desulfurization after combustion is also called flue gas desulfurization. The temperature of desulfurization medium can be further divided into wet method, dry method and semi-dry method. At present, the mainstream desulfurization method adopted by thermal power plants is flue gas desulfurization.

 

Some common types of equipment used for pulverizing limestone or lime include:

 

Ball mills are large rotating drums that grind the limestone or lime to a fine powder.

 

Vertical mills are similar to ball mills but are designed to operate at higher speeds and pressures, which can improve grinding efficiency.

 

The choice of pulverization equipment depends on several factors, such as the type and quality of the limestone or lime, the desired particle size, the capacity of the power plant, and the specific requirements of the desulfurization process.