https://cementl.com/ In coal-fired power/cement plants, vertical roller mills (VRMs) are widely used to pulverize coal for boiler combustion. The performance and reliability of these mills heavily depend on key wear parts, including the rocker arm, grinding table, and swing grinding roller.
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The grinding table forms the main rotating surface of the mill. Raw coal is fed onto the center of the table, and centrifugal force moves it outward under the grinding rollers. The table surface is lined with wear-resistant segments, typically high-chromium alloy or ceramic composites, to withstand abrasion from coal ash. Over time, these segments wear, and uneven surfaces can reduce grinding efficiency and lead to increased unburnt carbon in the boiler. Replacement of table liners is scheduled based on operating hours, coal hardness, and abrasion rate.
Swing grinding rollers apply pressure to the coal bed on the table, crushing the coal into fine particles. Each roller is mounted on a swing arm or rocker assembly, which allows it to maintain contact with the table surface while compensating for wear. The swing mechanism may be spring-loaded or hydraulically actuated, depending on the mill model. Proper operation of the rollers ensures uniform coal fineness, typically 70–75% passing 75–100 μm for conventional boilers. Worn rollers can cause inconsistent grinding, high vibration, and increased mill differential pressure.
The rocker arm is a critical link between the mill frame and the grinding roller. It supports the roller weight, transmits hydraulic or spring pressure, and allows controlled swing motion. Over time, the rocker arm pivots and bearings experience wear due to continuous operation and high loads. Failure of the rocker arm can lead to roller misalignment, uneven grinding, or even mill shutdown. OEM spare parts are recommended to maintain precise tolerances and ensure safe mill operation.
Vertical roller mills are subject to continuous mechanical stress and abrasion. Replacement of grinding tables, swing rollers, and rocker arms is generally planned during scheduled outages. Typical service life of these parts depends on coal hardness, moisture, ash content, and mill operating conditions, often ranging from 6,000 to 10,000 hours. Using high-quality spare parts helps maintain proper mill pressure, reduce vibration, and prevent unplanned downtime.
Operation monitoring focuses on several key parameters:
Mill differential pressure, indicating coal bed thickness and flow through the classifier.
Roller swing angle and hydraulic pressure, ensuring consistent grinding force.
Vibration levels on rollers and gearbox, to detect imbalance or wear.
Temperature of roller bearings, preventing overheating or failure.
Using spare parts that meet OEM specifications also ensures safety and reliability. Abrasive wear, misalignment, or failure of rocker arms and rollers can lead to high stress on mill housings, gearbox misalignment, or even coal pile-up, which poses fire hazards. Regular inspection, lubrication, and timely replacement are essential for safe operation.
In modern plants, replacement parts are often supplied with hardened surfaces or specialized coatings to extend life. High-chromium alloys, tungsten-carbide overlays, or ceramic inserts help reduce abrasion and maintain grinding efficiency. Proper installation and alignment of the rocker arm, rollers, and table segments are critical to restore original mill performance.
In summary, spare parts such as the rocker arm, grinding table, and swing grinding roller are vital to the continuous operation of coal pulverizer vertical roller mills. Maintaining these components ensures consistent coal particle size, stable boiler combustion, reduced vibration, and longer mill life. High-quality 2026 spare parts enable power plants to operate efficiently and safely while minimizing unplanned outages and maintenance costs.
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