grinding mill for limestone desulfurization in power plant

Summary: When limestone is used to desulfurize power plants, what are the requirements for limestone grinding? What kind of grinding mill should we choose?...

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 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 desulfurization. Limestone flour for desulfurization requires not only powder fineness but also calcium carbonate content. 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 the grinding mill meet the standard. For coal-fired boilers with low sulfur content in fuel, the fineness of limestone flour should ensure a 90% passing rate through 250-mesh sieve. When burning high‑sulfur coal, the fineness of limestone flour should ensure a 90% passing rate through a 325‑mesh sieve. 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?

Now that we have learned the fineness standard for limestone grinding, we have a relevant reference for choosing the right grinding mill. Here we recommend 2 limestone grinding mills according to market popularity.

1) MTW European Trapezium Grinding Mill (An upgraded version of the Raymond Mill)

MTW New-type Raymond Mill adopts a unique sealing device which can prevent powder leakage, meeting the required fineness and ensuring effective control over finished product quality. 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 applied in desulfurization of various power plants well, and customers have achieved good economic benefits. For different limestone flour, we can provide you with different solutions and relevant grinding equipment.

If you have any questions about the prices of different grinding mills, please contact us online or leave your message in the form. We will have a professional answer for you!