LM vertical coal mill complete system enables efficient operation of rotary kiln
The rotary kiln is an important calcining equipment, widely used in many fields, including chemical industry, metallurgy, environmental protection, building materials and agriculture. It calcines and processes materials under high temperature conditions by rotating pipes. At present, the rotary kiln uses coal as the main heat energy. Coal powder, as a common solid fuel, has the advantages of high calorific value, wide source and low price. The combustion stability of coal powder is good, which can meet the production needs of continuous operation of rotary kiln and is widely used in solid fuel for rotary kiln.
Project Overview:
The user is a large domestic metallurgical lime enterprise. This project is the front-end coal powder preparation link of the rotary kiln. In order to ensure the efficient and stable operation of the rotary kiln, the user has chosen to use Liming Heavy Industry LM vertical coal mill complete system to provide high-quality coal powder fuel for the rotary kiln after multiple comparisons and investigations. The fineness and water content of coal powder are strictly controlled throughout the preparation process to meet the requirements of rotary kiln for fuel. At the same time, in terms of safety, five-level explosion-proof measures are equipped to ensure the safety and reliability of the coal powder preparation process.
Processing materials: coal
Finished product use: rotary kiln fuel
Finished product fineness: 200 mesh
Equipment used: LM vertical coal mill
1. Equipment selection
The LM vertical coal mill system is the core of the project. It integrates crushing, grinding, drying, and graded transportation. The two-in-one form of drying and powder making realizes the "one-step" powder making process of grinding and drying. This large-scale powder grinding equipment condenses stable scientific and technological elements. It is equipped with a "five-level safety and explosion-proof system" such as CO-O2 online analysis, roller hydraulic device, and automatic control system, making the entire powder making process clean, environmentally friendly, safe, efficient, intelligent and high-yielding. Users can make diversified choices based on production, fineness, investment and other requirements.
2. Clean coal powder preparation and production process
The raw coal is screened through a lattice screen from the raw coal yard and falls onto a high-angle belt conveyor or elevator. After the iron is removed by an electromagnetic iron remover, the belt conveyor or elevator sends the raw coal to the raw coal bunker for storage. After the pulverizing system has been started, open the rod valve at the bottom of the raw coal bunker, start the sealed metering belt coal feeder, and the raw coal enters the LM vertical coal mill for drying and grinding. The hot air or exhaust gas from the hot blast furnace enters the vertical coal mill under the extraction of the system fan. After sufficient heat exchange with the raw coal being ground in the mill, the coal powder is brought up and sorted in the separator. The coarse coal powder with unqualified fineness falls back on the grinding disc for grinding. The qualified coal powder enters the explosion-proof air box pulse dust collector with the air flow and is collected and unloaded into the coal powder bunker through the grid wheel. The debris in the raw coal, such as some coal gangue, metal blocks, etc., are discharged from the mill through the air ring and slag outlet. In the whole process, a CO-O2 online analysis system is set up. When processing coal with high volatile content, safety measures such as nitrogen protection and CO2 automatic fire extinguishing system can be set up.
The technical advantages of LM vertical coal mill system:
1. Leading technology and low investment cost
It integrates crushing, grinding, drying, powder selection and transportation in one, with a compact layout and can be arranged in the open air, with low investment cost.
2. Low operating cost
The equipment is easy to operate, adopts a thin oil automatic forced lubrication system, and is equipped with a hydraulic roller turning device. During maintenance, the roller can be turned out of the machine by the hydraulic device, with large maintenance space, convenient maintenance and low operating cost.
3. Safe and reliable operation system
It adopts five-level safety and explosion-proof measures, and the design is safe and reliable, meeting national and industry parameter specifications.
4. Large drying capacity
Hot air can be used to convey materials, and the inlet air temperature can be controlled according to the moisture content of the materials. Materials with moisture content up to 15% entering the mill can be dried, and the moisture content out of the mill is <1%.
5. High grinding efficiency and good product quality
The special grinding roller and grinding disc structure design, and the grinding roller adopts a hydraulic automatic pressurization device, with a large grinding area, high grinding efficiency and large output.
6. Integrated comprehensive solution
The professional technical service team provides users with design, supply, installation general package services, and integrated comprehensive solutions.
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