Limestone is one of the most versatile materials which are rich in resources. It is widely used in both industry and construction. Here we’re gonna to talk about the most common uses of limestone—desulfurization in power plants. When limestone is used to desulfurize power plants, what are the requirements for limestone grinding? What kind of grinding mill should we choose? Here we will introduce them to you.
1. Requirements for limestone mill when used for desulfurization in power plants
Generally, not all limestone flour can be used for desulfuration. Limestone flour for desulfuration not only requires the fineness of powder but also the content of calcium carbonate. In addition, there are also regulations on environmental protection during the grinding production. In order to ensure the comprehensive utilization of desulfurized gypsum and reduce the discharge of sewage, the content of calcium carbonate in the limestone should be higher than 90% when it’s used for desulfurization.
Past experience shows that the fineness of the limestone flour (used for desulfurization) in power plants is generally required to be between 200 and 325 meshes. So it requires that the output size of grinding mill need to reach the standard. For the coal boiler which is low sulfur content in combustion, the fineness of the limestone flour should guarantee a 90% sieving rate of 250 meshes. When burning coal is with high sulfur content, the fineness of limestone flour should guarantee a 90% sieving rate of 325 meshes. Of course, you can also use quicklime (The purity of lime should be higher than 85%) as an absorbent.
2. What kind of grinding mill should we choose?
When we have learned the fineness standard of limestone in grinding, there has relevant reference foe choosing grinding mill. Here we recommend 2 limestone grinding mill according to the popularity of market.
1) MTW European Trapezium Grinding Mill (An upgraded version of the Raymond Mill)
MTW New-type Raymond mill adopts unique sealing device which can prevent "running powder", meeting the requirements of powder fineness and the quality of the finished product can be controlled effectively. In addition, MTW New-type Raymond mill has been equipped with professional dust removal which can realize high dust removal efficiency and low emission concentration. So it is more conducive to meeting environmental requirements. The equipment adopts bevel gear integral transmission, which makes its structure more compact and versatile.
2) LM Series Vertical Mill
LM vertical mill integrates crushing, drying, grinding, powder selection, transport in one. The running process can be produced in one step which can reduce the investment greatly. The materials can stay in the mill for a short time, which can reduce the repetition of grinding; chemical composition can be better controlled as well. So the quality of the finished product is more stable. Meanwhile, there is no direct contact between the grinding roller and the grinder table, it ensuring the purity of limestone flour (low iron content), and this can meet the requirement on power plant desulfurization.
The limestone powder produced by the grinding mill of SBM has been applicate in desulfurization of various power plants well, and customers have achieved good economic benefits. For different limestone flour, we can provide you with different solution and relevant grinding equipment.
If you have some question about the price of different grinding mill, please contact us online or leave you message on the form, there will be a professional for you to answer!