Slurry circulation pump LC800/980A is a key equipment in the ash handling system of thermal power plants, and is designed for conveying highly abrasive ash slurry. Its core function is to efficiently convey the mixture of slag and water produced after coal-fired power generation to the designated stacking area through centrifugal force to ensure the continuous and stable operation of the ash removal system. The pump is suitable for the complex working conditions of high concentration (solid content up to 45%) and high temperature (≤60℃) in power plants, and can effectively deal with the wear problem of ash particles on flow-through parts.

Slurry circulation pump LC800/980A adopts a double pump casing structure (the outer layer is a high-strength cast iron casing, and the inner layer is a replaceable wear-resistant liner), and the maintenance cost is reduced through modular design. The impeller is made of high chromium alloy cast iron (hardness HRC58-62) or wear-resistant white cast iron, combined with the labyrinth gap sealing technology of the rear-guard plate, which significantly reduces the risk of slurry leakage. The shaft seal system is equipped with a composite solution of auxiliary impeller dynamic seal and packing seal to ensure the sealing reliability under the condition of fluctuating solid content.

The service life of the pump is significantly affected by the abrasiveness of ash, start-stop frequency and maintenance strategy. It is recommended to adopt the following measures to extend the equipment cycle:

1. Preventive monitoring: Regularly check the thickness of the flow-through parts, and replace the impeller in time if the wear of the impeller on one side exceeds 5mm;

2. Working condition optimization: Control the slurry concentration in the range of 30%-45% to avoid operation beyond the design concentration;

3. Seal maintenance: Replenish the stuffing box lubricant every 2000 hours and check the auxiliary impeller clearance (standard value 0.3-0.5mm).

At present, similar equipment is being upgraded in the direction of intelligence. By adding vibration sensors and flow closed-loop control systems, the pump efficiency attenuation state is monitored in real time to achieve predictive maintenance. In the future, the material field will explore silicon carbide ceramic composite coating technology to further improve the wear life of the flow-through parts under extreme conditions.

When used in power plants, this Slurry circulation pump LC800/980A must strictly follow the selection specifications of “DL/T 514-2020 Ash Removal Design Code for Thermal Power Plants” and verify the system matching through hydraulic model tests to ensure safe and economical operation of the unit.

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