Witness Liming speed in 90 days! LM vertical coal mill helps a large state-owned enterprise asphalt mixing station coal powder preparation project to be successfully put into production
In the construction of asphalt pavement, the mixing and heating of asphalt materials is an important part. Its operating cost accounts for an important share of the entire production and operation cost, and the fuel cost is relatively large. The traditional asphalt mixing station that uses heavy oil as fuel produces large pollution after combustion, and the combustion is incomplete and the quality is unstable. The use of clean pulverized coal as fuel has many advantages: low production cost, convenient ignition method, full combustion, safe and energy-saving, green and environmentally friendly, non-corrosive, no harm to equipment, safe and pollution-free storage, good stability, and is particularly suitable for work and continuous production.
Project Overview：
This project is a fuel pulverizing production line for an asphalt mixing station of a well-known large state-owned enterprise in China. In order to meet the fuel use needs of multiple asphalt mixing equipment under its umbrella and further reduce fuel costs, and provide stable and high-quality pulverized coal products, the company decided to build a clean pulverized coal preparation production line within 3 months in the first half of 2024. After a comprehensive and multi-faceted detailed investigation in the early stage of the project, the user finally chose the LM vertical coal mill clean pulverized coal preparation production line of Liming Heavy Industry, which has leading domestic technology and the most widely used market. The entire grinding production line, from front-end feeding to back-end discharging, was designed by Liming Heavy Industry. The entire production site has a compact layout, reasonable design, simple and clean, green and environmentally friendly, and has achieved standardization, large-scale and intelligentization.
After the contract was signed, facing the tight time and heavy tasks, the project manager of Liming Heavy Industry arranged a reasonable and feasible construction plan. From the process design in the early stage of the project to the installation and commissioning of the later equipment, in just 90 days, a complete set of coal powder preparation system was erected in the factory area, standing out, fully reflecting the "Liming speed". Liming Heavy Industry returns to customers with excellent high efficiency and high-quality work results, helping customers to maximize their benefits.
Processing materials: coal
Finished product fineness: 200 mesh
Finished product use: asphalt mixing station
Used equipment: LM series vertical coal mill
Equipment selection:
The complete system of LM vertical coal mill 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 chemical grinding equipment condenses stable scientific and technological elements. It is equipped with "five-level safety and explosion-proof system" such as CO-O2 online analysis, grinding roller hydraulic device and automatic control system, making the entire powder making process clean, environmentally friendly, safe, efficient, intelligent and high-yield. Users can make diversified choices according to production, fineness, investment and other requirements.
Production process:
The raw coal is sieved through the grid screen from the raw coal yard and falls onto the high-angle belt conveyor or elevator. After the electromagnetic iron remover removes iron, the belt conveyor or elevator sends the raw coal to the raw coal bunker for storage. After the powder making 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 carried to the separator for sorting. 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 bin 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.
Technical advantages of LM series vertical coal mill:
1. Leading technology, low investment cost. It integrates crushing, grinding, drying, powder selection and transportation. It has a compact layout and can be arranged outdoors, with low investment cost;
2. The operating system is safe and reliable. The system is equipped with safety and explosion-proof measures such as CO-O₂ online detection and CO₂ automatic fire extinguishing system. The design is safe and reliable and meets national and industry parameter specifications;
3. 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, has a large grinding area, high grinding efficiency, and high production large quantity;
4. Large drying capacity, hot air can be used to transport materials, and the inlet air temperature can be controlled according to the moisture content of the materials. The materials with moisture content up to 15% entering the mill can be dried, and the moisture content out of the mill is <1%;
5. Low operating cost, the roller bearings are forced to be lubricated with thin oil, and are equipped with a hydraulic roller turning device. The roller can be turned out of the machine by the hydraulic device during maintenance. The maintenance space is large, maintenance is convenient, and the operating cost is low;
6. Integrated comprehensive solution professional technical service team, providing users with design, supply, installation general package services, integrated comprehensive solutions, worry-free and labor-saving.
Industrial application of clean coal powder:
1. Coal-fired industrial boiler field: It can be used as boiler fuel to improve boiler thermal efficiency, reduce pollutant emissions during coal combustion, and reduce coal combustion costs.
2. Metallurgical lime field: Lime kilns usually require high temperatures to calcine limestone. Clean coal powder, as a fuel treated by special processes, can achieve a higher burnout rate during combustion and reduce energy waste.
3. Preparation of pulverized coal for blast furnace injection: The pulverized coal injection system for blast furnaces has a wide range of uses in the power, steel, and metallurgical industries. The use of clean pulverized coal can effectively reduce carbon dioxide emissions and other harmful gas generation during blast furnace injection, achieving cleaner, low-carbon industrial production.
4. Coal chemical industry, coal-based new materials: Clean pulverized coal plays a key role in the production of coal-to-oil and coal-to-chemicals. Through high-temperature gasification and other technologies, coal is converted into liquid fuel or chemicals to achieve efficient utilization of coal resources.
Project Overview：
This project is a fuel pulverizing production line for an asphalt mixing station of a well-known large state-owned enterprise in China. In order to meet the fuel use needs of multiple asphalt mixing equipment under its umbrella and further reduce fuel costs, and provide stable and high-quality pulverized coal products, the company decided to build a clean pulverized coal preparation production line within 3 months in the first half of 2024. After a comprehensive and multi-faceted detailed investigation in the early stage of the project, the user finally chose the LM vertical coal mill clean pulverized coal preparation production line of Liming Heavy Industry, which has leading domestic technology and the most widely used market. The entire grinding production line, from front-end feeding to back-end discharging, was designed by Liming Heavy Industry. The entire production site has a compact layout, reasonable design, simple and clean, green and environmentally friendly, and has achieved standardization, large-scale and intelligentization.
After the contract was signed, facing the tight time and heavy tasks, the project manager of Liming Heavy Industry arranged a reasonable and feasible construction plan. From the process design in the early stage of the project to the installation and commissioning of the later equipment, in just 90 days, a complete set of coal powder preparation system was erected in the factory area, standing out, fully reflecting the "Liming speed". Liming Heavy Industry returns to customers with excellent high efficiency and high-quality work results, helping customers to maximize their benefits.
Processing materials: coal
Finished product fineness: 200 mesh
Finished product use: asphalt mixing station
Used equipment: LM series vertical coal mill
Equipment selection:
The complete system of LM vertical coal mill 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 chemical grinding equipment condenses stable scientific and technological elements. It is equipped with "five-level safety and explosion-proof system" such as CO-O2 online analysis, grinding roller hydraulic device and automatic control system, making the entire powder making process clean, environmentally friendly, safe, efficient, intelligent and high-yield. Users can make diversified choices according to production, fineness, investment and other requirements.
Production process:
The raw coal is sieved through the grid screen from the raw coal yard and falls onto the high-angle belt conveyor or elevator. After the electromagnetic iron remover removes iron, the belt conveyor or elevator sends the raw coal to the raw coal bunker for storage. After the powder making 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 carried to the separator for sorting. 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 bin 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.
Technical advantages of LM series vertical coal mill:
1. Leading technology, low investment cost. It integrates crushing, grinding, drying, powder selection and transportation. It has a compact layout and can be arranged outdoors, with low investment cost;
2. The operating system is safe and reliable. The system is equipped with safety and explosion-proof measures such as CO-O₂ online detection and CO₂ automatic fire extinguishing system. The design is safe and reliable and meets national and industry parameter specifications;
3. 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, has a large grinding area, high grinding efficiency, and high production large quantity;
4. Large drying capacity, hot air can be used to transport materials, and the inlet air temperature can be controlled according to the moisture content of the materials. The materials with moisture content up to 15% entering the mill can be dried, and the moisture content out of the mill is <1%;
5. Low operating cost, the roller bearings are forced to be lubricated with thin oil, and are equipped with a hydraulic roller turning device. The roller can be turned out of the machine by the hydraulic device during maintenance. The maintenance space is large, maintenance is convenient, and the operating cost is low;
6. Integrated comprehensive solution professional technical service team, providing users with design, supply, installation general package services, integrated comprehensive solutions, worry-free and labor-saving.
Industrial application of clean coal powder:
1. Coal-fired industrial boiler field: It can be used as boiler fuel to improve boiler thermal efficiency, reduce pollutant emissions during coal combustion, and reduce coal combustion costs.
2. Metallurgical lime field: Lime kilns usually require high temperatures to calcine limestone. Clean coal powder, as a fuel treated by special processes, can achieve a higher burnout rate during combustion and reduce energy waste.
3. Preparation of pulverized coal for blast furnace injection: The pulverized coal injection system for blast furnaces has a wide range of uses in the power, steel, and metallurgical industries. The use of clean pulverized coal can effectively reduce carbon dioxide emissions and other harmful gas generation during blast furnace injection, achieving cleaner, low-carbon industrial production.
4. Coal chemical industry, coal-based new materials: Clean pulverized coal plays a key role in the production of coal-to-oil and coal-to-chemicals. Through high-temperature gasification and other technologies, coal is converted into liquid fuel or chemicals to achieve efficient utilization of coal resources.
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