Efficient Energy-saving Vertical Coal Mill for Coal Grinding in Cement Plant - Vertical mills

Product Descripition:

Working Principle:
The material falls into the center of the grinding disc through the feeding tube, and the grinding disc rotating at a constant speed uses centrifugal force to evenly disperse and flatten the material outward, forming a certain thickness of material bed. Under the drive of the grinding disc, the material is pushed onto the roller conveyor of the grinding device and crushed by the rolling of the grinding roller. Under the action of centrifugal force, the pulverized coal powder overflows from the edge of the grinding disc and is carried by the high-speed upward hot air flow from the nozzle ring (air ring). Large particles directly fall onto the grinding disc for re grinding. When the material in the airflow passes through the upper separator, the coarse powder will return to the grinding disc for grinding under the action of the rotating rotor, and the qualified fine powder will enter the dust collector with the airflow and be collected into products.

Structural composition
Host: composed of grinding rollers, grinding discs, reducers, motors, etc., it is the core part of coal powder grinding. The grinding roller rolls on the grinding disc, crushing and crushing the material.
Separators: used to grade the ground coal powder, allowing the coal powder that meets the fineness requirements to pass through, and the unqualified coarse powder to return to the grinding disc for further grinding.
Hot air system: Provides hot air to dry the moisture in coal powder and bring the ground coal powder out of the mill. Hot air usually comes from kiln tail gas or hot blast stove.
Feeding system: including coal feeder, discharge pipe, etc., responsible for evenly feeding raw coal into the mill.
Dust collection system: collects coal powder, purifies exhaust gas, and ensures that the production environment meets environmental protection requirements. Common dust collection equipment includes bag filters, electrostatic precipitators, etc.
Control system: Real time monitoring and control of the operating parameters of the mill to ensure its stable operation.

Parameter Table of Coal Vertical Mill

Performance characteristics
Efficient and energy-saving: Compared with traditional ball mills, coal powder vertical mills have higher grinding efficiency and lower energy consumption. It adopts the principle of material bed grinding, which shortens the residence time of materials in the mill, reduces repeated grinding, and improves grinding efficiency.
Strong drying ability: It can use hot air stoves or kiln exhaust gases as heat sources to dry materials while grinding, and can handle raw coal with high moisture content, generally drying raw coal with moisture content up to 15%.
Stable product quality: The separator can accurately control the fineness of coal powder, making the product particle size uniform, which is conducive to improving combustion efficiency. Moreover, the airflow velocity inside the mill is high, and the material stays in the mill for a short time, making it easy to detect and control product quality.
Small footprint: compact structure, simple system, occupying about 50% less space than ball mill system, with less infrastructure investment.
Low noise and dust: Adopting a fully sealed system, it operates with low noise and dust, meeting environmental protection requirements.

Application Area
Electric power industry: In thermal power plants, vertical pulverized coal mills mill raw coal into pulverized coal to provide fuel for boilers. They are important equipment in thermal power generation systems.
Cement industry: Rotary kilns in cement plants require coal powder as fuel, and vertical coal powder mills can meet the large demand for coal powder in the cement production process.
Chemical industry: In chemical production, some processes require the use of coal powder as raw material or fuel. Coal powder vertical mills can provide suitable fineness coal powder for chemical production.