Power Plant Coal Mill Blast Furnace Injection Coal Powder Vertical Mill

Coal Vertical Mill Power Plant Coal Mill Blast Furnace Injection Coal Powder Vertical Mill
Product Introduction:
The coal vertical mill is the main equipment in the coal pulverization system, which is used to grind raw coal into fine coal and dry it. The coal grinding process is the process of coal being crushed and its surface area continuously increasing. The principles of coal grinding in a coal mill mainly include impact, compression, and grinding. The impact principle is to use the impact force generated by the relative movement of raw coal and the coal grinding components; The squeezing principle utilizes the pressure effect of coal between the surfaces of two grinding components under stress; The grinding principle utilizes the frictional force between coal and moving grinding components. In fact, the working principle of any coal mill is not the action of a single force, but the combination of several forces. According to the rotational speed of coal mill components, it can be roughly divided into three types: low-speed coal mill, medium speed coal mill, and high-speed coal mill.

The working principle of coal vertical mill;
The coal vertical mill is driven by an electric motor and drives the grinding disc of the coal mill to rotate through a planetary reducer. The 2-4 grinding rollers on the grinding disc rotate under the driving force of the grinding disc. The raw coal entering through the coal chute is distributed on the grinding disc. Due to the hydraulic loading force, there is compression between the grinding rollers and the grinding disc, causing large particles of raw coal to be crushed. The sliding friction force generated by the relative motion between the grinding roller and the grinding disc is used to achieve the crushing of small coal particles; During the grinding of raw coal in the mill, hot air (usually below 300 ℃) is introduced into the vertical mill to dry the moisture of the raw coal and meet the requirements for finished coal powder; The ground coal powder is transported by primary air into the separator for separation. The qualified coal powder is separated and transported to the coal powder bin, while the unqualified coarse coal powder is returned to the mill for re grinding. In order to achieve the required fineness of coal powder, a certain force must be applied to the grinding components. The grinding force is generated by the hydraulic system driving the spring device, which drives the upper grinding ring to move up and down to achieve loading force. The coal grinding work is completed by the grinding ring and the steel balls rolling on the raceway. All the steel balls are tightly arranged in a circle inside the upper and lower grinding rings, and the steel balls can freely roll between the grinding rings. The position of the rotation axis is constantly changed during coal grinding, Throughout the entire working life, the steel ball always maintains its roundness to ensure that the coal grinding performance remains unchanged, so that the output of the coal mill will not decrease due to the wear of the steel ball.

Parameter Table of Coal Vertical Mill

 
Highlighting advantages
High grinding efficiency and low power consumption
Low metal consumption per unit product
The process flow is simple, and the functions of material grinding, drying, and powder selection are completed simultaneously
Small footprint, compact layout, lightweight system equipment, and low investment in civil construction
Vertical mill is an ideal large-scale grinding equipment widely used in industries such as cement, electricity, metallurgy, chemical industry, non-metallic minerals, etc. It integrates crushing, drying, grinding, and grading transportation, with high production efficiency. It can grind block, granular, and powdered raw materials into the required powder materials.
Capacity: Different materials result in different processing capacities. Please refer to the technical parameter table below for details
Applicable materials: Vertical roller mill mainly grinds raw materials, clinker, mineral powder, slag, granulated blast furnace slag, limestone, coal powder, coke powder, coal gangue, fly ash, volcanic ash, gypsum, calcite, pyroxene, clay, sand, bauxite, silica fume, etc.
Application industries: cement chemical, coal, power and other industries.

Engineering Cases
Engineering Design and Equipment Manufacturing Supply of HVM2800M Vertical Pulverized Coal Preparation System
Processing material type: bituminous coal
Capacity: ≥ 80t/h
Product fineness: 200 mesh, 85% pass