Coal Vertical Roller Mill
LM Vertical Coal Mill, also known as the Medium Speed Coal Mill, is a large-scale and efficient grinding equipment developed by Liming Heavy Industry through the comprehensive introduction of technical advantages from Germany's Loesche and Pfeiffer. The vertical coal mill combines drying and powder production, allowing for simultaneous grinding and drying. The system operates safely, stably, with low noise, and is energy-saving and environmentally friendly.
Applications:
It is widely used in power plants, thermal power plants, cement plants, steel plants and other industries that require pulverized coal fuel and desulfurized stone powder.
Capacity: 4-100T/H
Input size: <50mm
Performance Advantages
Integrating crushing, drying, grinding, powder selection, and transportation. The process flow is simple, the layout is compact, the footprint is small, and it can be arranged outdoors, greatly reducing investment costs.
Adopting the principle of material layer grinding, the grinding roller directly crushes and grinds the material on the grinding disc.
Hot air delivery can be used to transport materials, and the inlet air temperature can be controlled when grinding materials with high moisture content. It can dry materials with a moisture content up to 15% and finished product moisture content less than 1%.
Adopting five level safety and explosion-proof measures, the design is safe and reliable.
The equipment adopts an automatic control system, which can achieve remote control, interlock protection, real-time monitoring, and abnormal reminders, making operation easier.
It has a limit device that prevents direct contact between the grinding roller and the grinding disc. The grinding roller and lining plate are made of special materials, which have a long service life and less wear consumption.
Working Principle
The raw coal is screened through a grid screen from the raw coal yard and then falls onto a large angle belt conveyor or elevator. After being removed by an electromagnetic iron remover, the belt conveyor or elevator sends the raw coal into the raw coal silo for storage. After the powder milling system has been started, open the rod valve at the bottom of the raw coal silo, start the sealed metering belt coal feeder, and the raw coal enters the vertical coal mill for drying and grinding.
The hot air or waste gases from the hot air stove is drawn by the fan and enters the vertical coal mill. After sufficient heat exchange with the raw coal in the mill, it carries the coal powder for classify at the classifier. The coarse coal powder with unqualified fineness falls back onto the grinding disc for grinding. The qualified coal powder enters the explosion-proof gas box pulse dust collector with the airflow and collected, and then discharged into the coal powder silo through the sorting wheel.
The impurities in the raw coal, such as some coal gangue and metal blocks, are removed from the mill through the air ring and slag outlet. Throughout the entire process, a CO-O2 online analysis system is installed. When processing coal with high volatile content, safety measures such as N2 protection and CO2 automatic fire extinguishing system can be set up.
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