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Hebi Huawei Measurement and Control Technology Engineering Co., Ltd
Technical Retrofit for Preventing Coal Blockages in the Coal Drop Chute of Circulating Fluidized Bed Boilers at Thermal Power Plants
2025-09-11
Coal chutes are the generic term for coal‑conveying pipelines used in industries such as coal mining, port operations, thermal power generation, coal storage and transfer facilities, coal preparation plants, and coal‑fired industrial boilers.
Coal chutes are the generic term for coal‑handling pipelines used in industries such as coal mining, port operations, thermal power generation, coal storage terminals, coal preparation plants, and coal‑fired industrial boilers. A typical coal chute comprises components like a coal hopper, a downcomer, and a flow‑diverting trough. For longer chutes, airlock devices are often added to minimize dust emissions. Additionally, when diverting flow, auxiliary components such as diverter flap gates may be installed.
The internationally advanced coal‑falling pipe technology, known as IFT (inertial flow transfer), has not yet been widely adopted in China due to its relatively high cost.
The coal‑fall pipe anti‑blocking device is a newly developed system designed to address the frequent arching and blockages in the coal‑feeding systems of circulating fluidized‑bed boilers at thermal power plants. It is also suitable for clearing and discharging materials in conveying lines across industries such as chemicals, cement, and pharmaceuticals. This equipment operates safely and conveniently, does not occupy internal space within the conveying line, and does not impede material flow. It is easy to install, simple to operate, and delivers stable performance, supporting both manual and automatic control.
Coal chute, slide chute, unloading machine
The rectangular chute is equipped with a high-frequency vibrating liner, while an external high-frequency vector exciter is mounted on the chute. The internal high-frequency vibrating liner efficiently clears and dislodges accumulated, blocked material at the chute bottom, enabling the material to regain fluidity under its own gravity, as shown in the figure below.
Coal chute clearing and cleaning equipment
When the moisture content of the raw material in the coal‑falling and conveying pipes exceeds 10%, its flowability decreases and its viscosity increases. The material gradually adheres to the pipe walls, layer by layer, eventually leading to complete blockage of the conveying pipe and halting material transport. The anti‑blocking device for coal‑falling pipes uses a drive shaft to rotate a flexible cleaning ring, which closely conforms to the inner wall of the pipe and alternately rotates left and right in a cyclical motion. This effectively removes material that has adhered to the pipe’s inner surface, preventing the formation of adhesive blockages—particularly delivering outstanding results in clearing coal‑falling pipes used in circulating fluidized bed boilers. After installation, operators no longer need to worry about moisture levels affecting the normal operation of the coal‑falling pipes, significantly reducing downtime and maintenance costs caused by blockages, lowering workers’ physical workload, improving operational efficiency, and helping enterprises achieve greater economic benefits.
Coal chute clearing and cleaning machine
The operating principle of the coal chute clearing and cleaning machine is shown in the figure:
The design philosophy of the coal chute blockage‑clearing equipment prioritizes prevention: flexible cleaning rings rotate periodically in both forward and reverse directions, thoroughly cleaning the inner walls of the chute and ensuring unobstructed material flow…
Features: Simple installation, low power consumption, high torque, automatic periodic operation, and no need for on-site operator supervision.
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