Coal bunker anti-clogging solution
In coal fired power plant, consistent fuel feedstock is vital for continuous power generation. Coal flowability is influenced by coal types, ash content, moisture, etc. To reduce generating cost, boiler combustion with coal blending of low grade coal like lignite is common in modern plant. That makes coal blockage happen frequently inside coal bunker, transfer chute, fuel chute. Especially for direct-fired pulverizing system, it may cause fast cut back or even forced outage. Traditional manual cleaning like hammering or poking is low efficiency and dangerous. Our advanced anti-clogging system brings solution to that problem.
Scraper Knife-rotation system
Coal clogging of fuel feeding system is not only an economic issue in power plant, more importantly, it means risk for safety of unit. The scrape knife-rotation system is key to prevention of blockage of coal bunker.
Applicable materials
Raw coal, coal gangue, mineral & ore, sandstone, clay, bottom ash, etc.
Principle of Scrape Knife-rotation
The scraper is spun by gear box drives and it forms relative rotation with the bin wall. During this process the coal bonding on the surface of bin wall are scraped off. Meanwhile a thrust force is produced and this is beneficial to coal flow.
Operation modes
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Control system: the system includes three (3) control modes.
- Local manual control： provide operation on the spot.
- DCS control： provide remote control.
- Auto control： has 2 modes, one is controlled by coal feeding quantity. When the quantity of feeding is smaller than set value, the equipment will start automatically. When the quantity is normal, the equipment stops. Another mode is timing.
Anti-clogging solution for coal bunker
For coal bunker, cross section gets smaller when location is closer to coal feeder. Blockage happens easily within area 1.5~3 meters above coal feeder. Our anti-clogging machine with rotating scrapper is installed at this location. By relative movement between scrapper and hopper wall, coal bonding with hopper wall is destroyed. Coal stored in bunker will flow freely into coal feeder.
- Reliable performance, not affected by material moisture content.
- Interlock with material flow signal from coal feeder. Quick action after clogging is detected.
- Reverse rotation to avoid overload when scrapper gets stuck.
- Labyrinth sealing, no spillage of dust.
- Wearing resistant hopper wall and scrapper.
Anti-clogging solution for transfer chute
Wearing and clogging is common issue for transfer chute, which delivers coal to roller screen, crusher, belt conveyor in power plant. Our special design of anti-clogging solution for transfer chute solves that problem perfectly. Wall B is detachable structure with rotary scrapper mechanism. In operation, inclined wall A could avoid too much abrasion with coals, while wall B receives incoming material and push them downwards to avoid blockage. And its wearing resistant material makes it serve longer.
- Reasonable rotation speed balances cleaning performance and service life.
- Easy replacement, detachable structure of wearing parts.
- Smart control, automatic operation.
- Overload protection when jamming happens.