Energy Saving Vertical Coal Mill Environmentally Friendly Lime Vertical Mill

Product Specification

Coal Mill, Energy-Saving Environmentally Friendly Vertical Mill, Lime Vertical Mill

Product Descripition:

1, What is the process of coal milling?
Coal mills are widely used in coal powder production in fields such as chemical, metallurgical, and electric power, and are indispensable and important equipment in coal powder production. So, how should the process flow be implemented during the operation of the coal mill? The following text will provide a detailed introduction.
2, Process flow
1. Coal powder extraction
Firstly, it is necessary to extract coal powder. For the raw coal before entering the coal mill, it needs to be processed by an extraction system to extract the coal powder from the coal pile. Common coal powder extraction methods include vibrating feeders and spiral feeders, and coal powder extraction requires a uniform and stable extraction amount.
2. Coal powder preheating
After the coal powder extraction is completed, it enters the preheating stage, mainly by adding hot air to preheat the coal powder and achieve a certain drying effect. In addition, the purpose of this process is to improve the fluidity of coal powder and facilitate subsequent process operations such as coal powder conveying and pneumatic conveying.
3. Coal powder drying
After preheating, the coal powder undergoes drying treatment to evaporate excess moisture from the coal powder, ensuring subsequent grinding effects. At the same time, it can also improve the combustibility of the coal powder and reduce the combustion temperature after drying.
4. Coal powder grinding
The dried coal powder enters the grinding process, and its main task is to grind the coal powder into fine powder within a certain particle size range, and achieve uniform and stable particle size of the coal powder. Common grinding methods include ball mills, vertical coal mills, etc., which require coal mill equipment to have the characteristics of high efficiency, energy conservation, and environmental protection, while also improving production efficiency and reducing production costs.
5. Coal powder conveying
Finally, the ground coal powder needs to be transported, stored, or used. Common coal powder conveying methods include pneumatic conveying, belt conveying, spiral conveying, etc. Coal powder conveying requires stability and reliability, and maintaining stable coal powder quality.

Working Principle
The motor drives the grinding disc to rotate through the reducer, the material falls into the center of the grinding disc from the feed inlet, and the hot air enters the mill from the air inlet. Under the action of centrifugal force, the material moves to the edge of the grinding disc, and is crushed by the grinding roller when passing through the annular groove on the grinding disc. The crushed material is carried by the high-speed airflow at the air ring at the edge of the grinding disc, and the large particles fall directly on the grinding disc. Re-grinding, when the material in the airflow passes through the dynamic and static separator, under the action of the rotating rotor, the coarse powder falls on the grinding disc for re-grinding, and the qualified fine powder is ground together with the airflow and collected in the powder collecting device, which is product. Moisture-containing materials are dried during contact with hot gas to achieve the required product moisture.

Parameter Table of Coal Vertical Mill

 
According to coal coking, it can be divided into anthracite (with a fixed carbon content of 93-98% and volatile content less than 10%), lean coal (called semi anthracite, with volatile content between 10% and 20%), bituminous coal (with volatile content greater than 14%), brown coal (with high volatile content and high moisture content), etc; According to the variety, it can be divided into two categories: coarse-grained coal powder and fine-grained coal powder. After being processed by a grinding machine, it can be applied in the chemical industry, smelting, gas making, glass, ceramics, ceramic tiles, metallurgical casting industry, etc. Regarding the coal powder processing technology, the grinding machine manufacturer will provide you with a detailed explanation:
Phase 1: Crushing and shaping
The coal is crushed by a jaw crusher or a cone crusher, and finally discharged into a block of material suitable for entering the grinding machine, with a size of no more than 50mm.
Phase 2: Grinding powder
The small pieces of coal material after crushing only need to meet the requirements of the vertical coal powder mill before it can be sent to the silo by the elevator, and then evenly and quantitatively sent into the coal grinding room for grinding by the vibrating feeder. The ground material enters the first stage of the process.
Third stage : Grading and powder collection
The coal material after grinding is classified by a powder selection machine, and the unqualified powder is classified by the powder selection machine and returned to the main machine for re grinding (referring to a vertical coal powder grinding machine). The fine powder that meets the fineness requirements flows through the pipeline and enters the dust collector for separation and collection. The collected finished powder is sent to the finished material bin by the conveying device through the discharge port.
Stage 4: Packaging and finished products
The coal powder that has reached the finished product will be uniformly packaged and transported by rotary packaging machines or automatic loading machines in various industries.
The above is the process of using a vertical coal powder mill to process coal powder. The quality of coal powder is closely related to equipment performance, raw material properties, and raw material composition. The main factors affecting coal powder combustion include volatile matter, calorific value, fixed carbon, moisture, sulfur, ash content, and fineness.
Outstanding Advantages
1. Small footprint and low investment cost
2. Adjustable loading force, strong applicability and high milling efficiency
3. Strong drying ability
4. Product quality is stable easy to maintain