Large-Scale Clean Coal Powder Preparation Project in the Northwest Region Successfully Commissioned

Coal is divided into several major categories, including raw coal, lignite, and anthracite. Clean coal powder represents the clean utilization of traditional coal, grinding raw coal into fine powder with a particle size of 200 mesh. While removing impurities, it enables clean emissions during coal powder combustion, achieving a burnout rate of over 98%. Its emergence signifies a significant advancement in the clean utilization of traditional coal and is an important direction for the transformation and upgrading of the current coal industry, aiming for sustainable development. This aligns with the national policy direction in the context of significant energy reforms and efforts to promote energy conservation and emissions reduction.

Project Overview

The Northwest region is rich in coal resources, providing ample raw material support for coal powder stations. National environmental protection policies and the Western Development Strategy offer policy support for the development of coal powder stations. The demand for industrial production and winter heating has also driven the growth of the coal powder market. In the context of increasingly stringent environmental requirements, coal powder stations need to increase their investment in environmental protection and adopt efficient, low-emission technologies to enhance their competitiveness.

Project Preliminary Phase

This project is a large-scale clean coal powder preparation project in the Northwest region. At the initial planning stage, the owner actively responded to the national green development and environmental protection concepts, planning to build an efficient and environmentally friendly clean coal powder production line. After comprehensive and rigorous assessments and comparative analyses of multiple proposals, Liming Heavy Industry's independently developed clean coal powder preparation technology—LM series vertical coal mill—stood out among many options due to its superior overall performance and environmental advantages, ultimately gaining high recognition and selection from the client.

Project Mid-Term

For this project, Liming Heavy Industry dispatched engineers to continuously follow up on project operations, closely tracking all aspects after delivery to ensure the smooth commissioning and production capacity of the equipment. During the construction process, despite encountering heavy snowfall, the on-site installation workers remained steadfast in their positions, undeterred by the cold, demonstrating a high level of professionalism and craftsmanship. Their persistence and efforts ensured that the project progressed steadily as planned, providing a solid guarantee for timely completion of the schedule.

Project Final Phase

After the project was completed, to ensure the efficient operation and long-term stability of the production line, we conducted systematic training for relevant personnel, covering key knowledge such as product performance, operating standards, and maintenance practices. Through a combination of theoretical and practical training, we helped operators master the key points of equipment operation and maintenance skills. At the same time, we will establish a long-term tracking mechanism, conduct regular follow-ups, and provide technical guidance to resolve any issues during operation, ensuring that the production line remains in optimal condition and continuously creates value for the users.

Live from the Customer Site

Processed Material: Coal Powder

Finished Fineness: 200 Mesh

Equipment Used: Liming Heavy Industry LM Vertical Coal Mill

Equipment Selection

After years of research and experimentation, Liming Heavy Industry has developed LM vertical coal mill specifically for coal powder preparation, suitable for anthracite, bituminous coal, and lignite. The fineness of the coal powder is adjustable, with stable operation, low energy consumption, and high output. Additionally, the coal powder preparation system is equipped with "five levels of safety explosion-proof measures," achieving comprehensive fire and explosion prevention coverage across all areas, processes, and source points. This effectively ensures the safe and stable operation of the system, with reliable safety performance, earning numerous repeat orders and widespread acclaim from customers.

Raw coal is screened through a grid screen from the raw coal yard and then falls onto a steep-angle belt conveyor or elevator. After passing through an electromagnetic iron remover to eliminate iron, the belt conveyor or elevator transports the raw coal to the raw coal bin for storage. Once the grinding system is fully operational, the bottom rod valve of the raw coal bin is opened, and the sealed metering belt feeder is activated, allowing the raw coal to enter the vertical coal mill for drying and grinding.

The hot air or waste gas from the hot air furnace, under the suction of the system fan, enters the vertical coal mill, where it undergoes sufficient heat exchange with the raw coal being ground. The resulting coal powder is then separated at the separator; coarse coal powder that does not meet the fineness requirements falls back onto the grinding table for further grinding. Qualified coal powder is carried away by the airflow into the explosion-proof air box pulse dust collector, where it is collected and then discharged into the coal powder bin through the distribution wheel.

Impurities in the raw coal, such as coal gangue and metal pieces, are expelled outside the mill through the air ring and slag discharge outlet. Throughout the entire process, a CO-O2 online analysis system is installed. When processing coal with high volatile content, safety measures such as nitrogen protection and an automatic CO2 firefighting system can be implemented.

Equipment advantages

01 Leading Technology, Low Investment Cost

Integrating crushing, grinding, drying, powder selection, and transportation into one compact layout, it can be arranged outdoors, resulting in low investment costs.

02 Safe and Reliable Operating System

The system is equipped with safety explosion-proof measures such as CO-O₂ online detection and CO₂ automatic firefighting systems. The design is safe and reliable, complying with national and industry parameter standards.

03 High Grinding Efficiency, Good Product Quality

The special design of the grinding roller and grinding table structure, along with a hydraulic automatic pressure device for the grinding rollers, provides a large grinding area, high grinding efficiency, and substantial output.

04 High Drying Capacity

Hot air can be used to transport materials, with the inlet air temperature controlled according to the moisture content of the material. It can dry materials with moisture content up to 15%, with outlet moisture below 1%.

05 Low Operating Cost

The grinding roller bearings use forced thin oil lubrication and are equipped with a hydraulic roller lifting device, allowing the grinding rollers to be flipped out of the machine for maintenance, providing ample space for repairs and convenient maintenance, resulting in low operating costs.

06 Integrated Comprehensive Solution

A professional technical service team provides users with design, supply, and installation package services, offering an integrated comprehensive solution that saves time and effort.