Coal Mill for sale

coal mill design

Coal mill also called coal pulverzier or coal powder mill is that grinding mill used in coal mining industry and thermal power plant, such as vertical coal mill. And in general, vertical mill includes mineral series and coal series. The first series grinder can be widely used in cement making, power, metallurgy, chemical, ore industries.
And the vertical coal mill also called coal grinder is the most used machine for coal grinding according to our mining experience. In some cases, coal mill is not just one grinder mill, it will include some optional equipment such as vibrating feeder, vibrating screen, belt conveyors and so on to finish the coal milling process. So, coal mill is also used widely in many industries besides coal mining.

coal mill operation

Coal mill is an efficient tool for grinding coals into fine powder in coal mining industry. According to its fineness and working principles, we divide coal mill into coarse power coal mill and fine coal mill. Coarse powder mill is a kind of new high-tech milling machine to meet the requirements of coarse powder processing customers. It is the ideal equipment to replace Raymond mill, ball mill, and other traditional mill which only process fine coal powder materials.
Ball grinding mill is the early coal mill used in coal powder plant, there are two types: wet ball mill and dry ball mill. Vertical mill is the most common coal grinding mill in milling plant, so vertical mill is also called vertical coal mill, it set up the coal mill standard. Raymond mill is also the early coal mill; the capacity of this coal mill can be up to 6-8 t/h. The fines of the finished product can be adjusted from 100 meshes to 325 meshes according to the requirements.
SBM is a professional coal mill manufacturer in China, and supply coal crushers and coal mills for sale with best price all over the world. We also can design coal milling solution according to the special requirements of our customers.

Coal mill working principle

Raw coal is fed through a central coal inlet at the top of the coal mill and falls by gravity to the rotating grinding table, mixing with classifier rejects returned for re-grinding. Centrifugal action forces the coal outward to the grinding ring where it is pulverized between the ring and three grinding rollers. Grinding load, transmitted from the tension rods through the loading frame to the roller assemblies, holds the rollers in contact with the grinding ring. The rollers adjust vertically as the depth of the coal load increases or decreases.
A nozzle ring on the outside perimeter of the grinding ring feeds primary air to the coal mill. Pyrites and tramp metal fall through the nozzle ring openings to be scraped into a rejects hopper. A stream of low-velocity air carries the particles of pulverized coal upward where they enter the classifier inlet vanes. Fine particles travel to the burners in the primary air stream, but the larger, heavier particles are returned to the grinding zone for further pulverization.

Table and roller coal mills

In coal fired power plant, coal mill is used to grind, pulverize and dry coal before the coal is transmitted the boiler. The coal is feed into the coal mill via a inlet pipe so that the roller coal mill such as Raymond mill and vertical mill can pulverize the coal into particles.
The hot air in the coal mill will lift the coal particles out of the Raymond mill or vertical mill and into the boiler, if the coal particles are too heavy they will drop to the bottom of the coal mill too and will be grind, pulverize again.
The coal flow into the boiler is an important factor for a coal fired power plant. But in fact, it is not easy to measure the coal flow from the coal mill to the furnace. The coal flow out of the coal mill is often estimated based on the incoming coal flow.
our best coal mill design possible suitable for you!