Coal Mill

Coal mill also called coal pulverzier is that grinding mill used in coal mining industry, such as vertical coal mill. And in general, vertical mill includes mineral series and coal series. The first series pulverzier can be widely used in cement making, power, metallurgy, chemical, ore industries. And the vertical coal mill 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.

Raw coal is fed through a central coal inlet at the top of the pulverizer 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 pulverizer. 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.

The particle size of slack coal is 0 ~25 mm. The slack coal is often used as combustion agent in steel company, thermal power plant, etc. The consumption of coal is quite large in thermal power plants. Take a 1 million kW thermal power plant for example, coal consumption amounts to 11,000- 13000t a day, which takes 60% ~ 80% of the cost for generating electricity. It is advisable to adopt appropriate coal mill for coal grinding. This can not only improve the utilization of coal, but also contribute to energy saving, environmental protection, economic benefits.

According to the market research, vertical coal mill is used most widely. There are also other grinding mils like traditional Raymond mill, roller mill, trapezium mill, etc. can also meet different requirements for grinding coal into different sizes and types. Customers can choose an appropriate coal according to their specific needs.

SBM coal mill are used in the cement industry for grinding cement raw material, coal, petroleum coke, blast-furnace slag, pozzolana and cement. In order to extend the life of our coal mill, you should do some maintenance .

1, milling machine using the process, there should be regular staff responsible for the custody of the operator must possess a certain level of technology, milling machines are installed before the operation is to conduct technical training for customs officers must make to understand the principle of mill performance, familiar with operational procedures.

2, for the mill to work, there should be equipment "Maintenance of the safe operation of systems" can ensure the long-term safe operation of mills at the same time have the necessary repair tools and accessories grease.

3, mill use for some time, maintenance should be carried out, while roller grinding ring Blade repair of wearing parts such as replacement roller device in use before and after the connecting bolt nut plug should be carefully examined whether there is loosening , lubricating oil is to add a little grease.

4, roller devices of the time more than 500 hours or so to replace the roller when the roller kit must be cleaned of all rolling bearings, damaged parts should be replaced, dispensing fuel or butter can be used to manually hand gun.

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• Address : No.416 Jianye Road,South Jinqiao Area,Pudong New Area, Shanghai, China
• Tel : 0086-21-58383058 0086-21-58383022
• Fax : 0086-21-58383058
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