The Roller Screen is widely used in the coal conveying system of thermal power plants. In the coal conveying system of a thermal power plant, the screening and pre-treatment of coal are crucial steps to ensure efficient combustion of the boiler.
If you are looking for efficient equipment and reliable operation, the Coal Roller Screen, with its unique working principle and excellent performance, is perfectly suited to meet the requirements of your power plant operation.
Roller Screen Structure
The roller screen is mainly composed of components such as the drive device, screen body, screen shaft, screen disc, and self-cleaning device.
Drive Device: It adopts a single-axis single-motor drive or a multi-axis chain combination transmission mode. The power is reasonably configured to ensure uniform distribution of materials on the screen surface and smooth operation. The drive device has a simple structure, making it convenient for installation and disassembly. During maintenance and disassembly, the connected screen shaft does not need to be shifted, saving time and effort.
Screen Shaft:
It is made by casting a 42CrMo forging, which has excellent wear resistance. The structure has been optimized through CAE force analysis, and the design is reasonable and safe. It helps you effectively avoid faults such as bending or fracture of the tooth roller shaft.
Screen Disc: It can be designed as a parabolic roller disc blade based on the specific characteristics of the materials in your site, as well as the flow rate of the materials. Common styles include arc-shaped, plum blossom-shaped, and circular shapes, which can be tailored to your actual screening process.
Screen Body: It is formed by integral welding of Q355D low-alloy high-strength structural steel. All screen shaft assemblies are fixed inside the body through connecting bolts. On the side of the body, a wear-resistant lining with a thickness of no less than 25mm is installed, with the material meeting the standards of ZGMn18Cr2 or above. This helps prevent direct contact between the materials and the box body, significantly extending the service life of the equipment.
Self-Cleaning Device: Made of wear-resistant steel and equipped with inclined cutting edges, it can automatically remove fibers and debris as well as sticky materials adhering to the sieve surface, helping you completely solve the problem of sieve hole blockage and eliminating the need for frequent cleaning and unblocking.
This scientifically sound and reasonable structural design can meet the different screening requirements of coal particles on site, while ensuring the reliability of equipment operation and the durability of the entire machine.
Roller Screen Working Principle
When the coal materials at the site enter the screen surface, they continuously roll and move forward under the rotation of the screen shaft. Particles smaller than the screen hole size pass through the screen and fall down to achieve classification, while the materials larger than the screen hole continue to be transported along the screen surface and are discharged from the discharge end.
The Wobbler Feeder, a mechanical forced screening method, not only has a large processing capacity and high screening efficiency, and is not affected by the moisture content of the materials, but is also particularly suitable for screening wet and sticky materials. Moreover, the special structure of the screen shaft can effectively prevent blockages, ensuring the continuous and stable operation of the equipment.
Key Applications In Power Plant Coal Handling Systems
In the coal conveying system of thermal power plants, our Disc Screen is mainly applied in the following three stages:
►The raw coal is pre-screened at the factory to separate large pieces of coal from impurities;
►Before crushing, it is further screened to ensure the uniformity of the material size entering the crusher;
►Before being fed into the boiler, it undergoes final screening to ensure that the coal meets the standard particle size requirements.
The multi-stage screening process not only enhances the utilization rate of coal, but also reduces the load on the crusher and extends the service life of the equipment. For lignite with high moisture content and high viscosity, the anti-sticking and anti-blocking advantages of the "Coal Roller Screen" are particularly prominent.
Roller Screen Advantages
By choosing our roller screen, you will enjoy multiple technical advantages:
- It has strong processing capacity, with a production output of up to several hundred tons per machine, meeting the coal supply requirements of large power plants;
- The screening efficiency can reach over 90%, far exceeding that of traditional vibrating screens;
- It is highly adaptable, capable of handling different moisture and viscosity of coal, and the screen holes are less likely to get clogged.
- It also features smooth operation, low noise, simple maintenance, and lower energy consumption.
- It has no strong vibration impact, has little effect on the building structure, and is the preferred screening equipment for modern coal conveying systems in power plants.
Selection And Layout Design
In actual engineering applications, the selection and layout should be carried out in conjunction with the overall process flow of the coal conveying system. Large power plants often adopt a multi-stage screening process: the primary stage uses large-diameter screens to remove extremely large pieces of material, the intermediate stage uses medium-diameter screens for classification, and the final stage uses small-diameter screens to ensure the particle size of the coal entering the furnace.
The on-site layout should reasonably control the material transfer drop difference to ensure smooth material flow; it should reserve sufficient maintenance space to facilitate daily maintenance; additional bypass settings should be added, so that during equipment maintenance, it does not affect the normal production of the entire production line, and the performance of the equipment is maximized.
The roller screen, as the core and key equipment of the coal conveying system in thermal power plants, has gained widespread recognition in the industry for its excellent performance and wide applicability. Through scientific selection, standardized installation, and professional maintenance, the equipment's technical advantages can be fully utilized, ensuring the safe, stable, and economic operation of the power plant. With the advancement of technology, the roller screen will play an even more important role in the field of thermal power generation.
If your coal conveying system in the power plant is in need of efficient, anti-block, durable and hassle-free Roller Screen equipment, please feel free to contact us at any time. We can customize a one-on-one selection plan and overall configuration for you based on your on-site conditions, material characteristics, processing capacity and screening particle size requirements.
