Coal Powder Vertical Grinding Mill Limestone Vertical Mill Machine

What is a vertical coal mill used for?
Vertical coal mills are suitable for grinding medium hardness materials such as bituminous coal, and are used in positive pressure direct blowing pulverization systems for burning bituminous coal. They are applied in industries such as power, metallurgy, building materials, and chemical engineering. This machine not only has the characteristics of low unit power consumption, small floor area, simple pulverizing system, low noise, and reliable operation, but also has unique advantages such as large crushing ratio, long service life of grinding parts, wide material application range, and good applicability at high and low loads.
This machine not only has the characteristics of low unit power consumption, small floor area, simple pulverizing system, low noise, and reliable operation, but also has unique advantages such as large crushing ratio, long service life of grinding parts, wide material application range, and good applicability at high and low loads.

Performance characteristics
The three grinding rollers of the coal mill are driven by a rotating grinding disc for grinding operations. After the incoming material falls onto the grinding plate through the central coal chute, it is transported to the grinding roller track for grinding by the centrifugal force generated by the rotating grinding plate. The grinding pressure is generated by springs or hydraulic pressure devices, and is uniformly transmitted to the three grinding rollers through a static three-point system. The pressure is then transmitted to the foundation through the pressure system. The drying and transportation of coal powder are carried out using hot air. The hot air is evenly distributed around the grinding disc through the nozzle ring, drying the ground material and conveying it to the separator on the upper part of the mill. The coarse and fine powder of the material is separated here, the fine powder is discharged from the mill, and the coarse powder is returned to the mill for grinding. Some non crushable substances in the material can be discharged through the discharge port at the lower part of the mill. The coal mill mainly consists of basic parts, reducer, lower frame machine, middle frame machine, grinding disc, grinding roller, pressure device, separator, positive pressure air sealing device, steam blowing device, and other components. It is also equipped with auxiliary equipment such as main motor, lubricating oil station, hydraulic station, and sealing fan, as well as slow speed transmission device, installation and maintenance special tools, escalator platform, coal powder distributor, quick break valve, and other supporting equipment for users to choose from. The coal mill adopts a hydraulic pressurization system, which can adjust the grinding pressure during operation and has better iron passing protection performance. On the basis of the original standard model, a grinding roller tilting device has been added and the anti explosion ability of the grinding body has been improved.

Working principle: The electric motor drives the grinding disc to rotate through a reducer, and the material falls into the center of the grinding disc from the feeding port. At the same time, hot air enters the grinding chamber from the air inlet. Under the action of centrifugal force, materials move towards the edge of the grinding plate. When passing through the circular groove on the grinding plate, they are crushed by the grinding roller. The crushed materials are picked up by the Jet stream at the wind ring at the edge of the grinding plate. Large particles fall directly onto the grinding plate for grinding again. When the materials in the airflow pass through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls onto the grinding plate for grinding again. The qualified fine powder is grinded together with the airflow, Collect in the powder collection device, which is the product. Materials containing moisture are dried during contact with hot gases to achieve the required product moisture.

Parameter Table of Coal Vertical Mill

Advantage
1. Efficient and energy-saving:
(1) High grinding efficiency and low energy consumption, compared to ball mills, the energy consumption is 40% -50% lower;
(2) Large single machine production capacity, capable of utilizing low valley electricity;
(3) Vertical grinding technology and equipment are vigorously advocated new technologies for energy conservation and consumption reduction, which are conducive to enhancing the competitive strength of enterprises in the powder industry in this region and even across the country;
2. Easy maintenance and low operating costs:
(1) The grinding roller can be turned out of the machine using a hydraulic device, and the replacement of the roller sleeve lining plate and the maintenance space of the mill are large, making the maintenance operation very convenient;
(2) The grinding roller sleeve can be used upside down, extending the service life of wear-resistant materials;
(3) Before starting the machine, there is no need to apply fabric to the grinding disc, and the mill can be started without load, eliminating the difficulty of starting the machine;
(4) Low wear, special materials are used for the grinding roller and disc lining plate, resulting in a long service life;
(5) High degree of automation: The automatic control technology adopts the Siemens series PLC from Germany, equipped with an automatic control system, which can achieve remote control and easy operation. The workshop can basically achieve unmanned operation, saving operating costs;
3. Low comprehensive investment cost:
Integrating crushing, drying, grinding, and conveying, the process flow is simple, the system equipment is few, the structural layout is compact, and the floor area is only 50% of that of the ball mill. It can be arranged outdoors, with low construction costs, directly reducing the investment cost of the enterprise.
4. Stable product quality:
(1) The material stays in the grinder for a short time, making it easy to detect the particle size distribution and composition of the product, and ensuring stable product quality;
(2) The product has uniform particle morphology, narrow particle size distribution, good flowability, and strong product adaptability.
5. High reliability
(1) Adopting a grinding roller limit device to avoid severe vibration caused by material breakage during the working time of the mill;
(2) Adopting a new type of roller sealing device, the sealing is more reliable, and there is no need for a sealing fan, further reducing the oxygen content in the mill and achieving better explosion suppression performance.
6. Environmental protection:
(1) The entire system of HVM vertical grinding machine has low vibration and low noise;
(2) The system is sealed as a whole, operates under full negative pressure, and there is no dust leakage, basically achieving a dust-free workshop.

Engineering Cases
Engineering Design and Equipment Manufacturing Supply of HVM1500 Vertical Mill Pulverized Coal Preparation System
Processing material type: Raw Coal
Capacity: ≥ 18t/h
Product fineness: 200 mesh,90% pass