Hebi Huawei Measurement and Control Technology Engineering Co., Ltd
Technical Retrofit for Preventing Coal Blockages in the Coal Drop Pipes of Circulating Fluidized Bed Boilers at Thermal Power Plants
2025-09-11
The coal chute is a general term for coal-conveying pipelines used in industries such as coal mining, ports, thermal power plants, coal transshipment terminals, coal preparation plants, and coal-fired industrial boilers. Typically, a coal chute system includes components like coal hoppers, downpipes, and diversion chutes. For longer pipelines, airlocks are often added to minimize dust emissions. Additionally, when diverting flows, components such as diverter flap gates may be incorporated.
Internationally advanced coal chute technology, known as IFT technology (inertial flow transfer) for inertial flow transportation, has not yet been widely adopted domestically due to its relatively high cost.
The coal chute anti-blocking device is a newly developed equipment specifically designed for thermal power plants, where the coal supply system of circulating fluidized bed boilers is prone to arching and blockages. It is also effectively applicable to clearing and discharging materials in conveying systems used in industries such as chemical processing, cement production, and pharmaceuticals. This equipment boasts safe and convenient operation, occupies no internal space within the conveying pipes, ensures uninterrupted material flow, and is easy to install and operate. With its stable performance, it supports both manual and automatic control options, making it an ideal solution for efficient and reliable material handling.
Coal chute and hopper unblocking discharging machine
The rectangular chute is equipped with a high-frequency vibrating liner, while an external high-frequency vector vibrator is installed on the chute itself. The high-frequency vibrating liner inside the chute efficiently clears and removes accumulated materials clogging the bottom, enabling the material to regain fluidity under its own gravity, as illustrated in the figure below:
Coal Drop Pipe Unblocking and Cleaning Machine Equipment
The raw material in the coal discharge pipe and feeding tube has a moisture content exceeding 10%, leading to reduced flowability and increased viscosity. As a result, the material gradually adheres layer by layer to the inner wall of the pipe. Over time, these accumulated layers eventually cause the feeding tube to become completely blocked, halting the material flow altogether. The anti-blocking device for the coal discharge pipe operates by using a transmission shaft to drive a flexible cleaning ring, which moves back and forth against the inner pipe wall in a periodic, reciprocating motion. This action effectively removes the adhering material from the pipe’s inner surface, preventing it from building up and causing blockages—particularly excelling in clearing blockages within the coal discharge pipes of circulating fluidized bed boilers. After installing this equipment, operators no longer need to worry about how material moisture levels might affect the normal operation of the coal discharge pipe. This not only helps minimize costly downtime caused by furnace shutdowns due to coal blockages but also significantly reduces workers’ physical labor intensity, boosting overall efficiency. Ultimately, these improvements enable enterprises to achieve greater economic benefits.
Coal Drop Pipe Unblocking and Cleaning Machine
The principle of the coal chute clearing and cleaning machine is illustrated in the figure below:
The design concept of the coal chute blockage-clearing equipment prioritizes prevention: its flexible cleaning ring rotates periodically in both forward and reverse directions, effectively sweeping clean the inner walls of the coal chute and ensuring smooth material flow…
Features: Simple installation, low power consumption, high torque, automatic periodic operation—no need for on-site personnel supervision.
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