For emptying the collected dust from a Hopper, a discharge device is installed. There are various designs of discharge devices – both manual as well as automatic. For small installations, manual ones like the slide gate of the hinged doors are used.
However, for bigger ESP’s which are in continuous operation, automatic discharge devices are installed. The most commonly used devices are Double-Cone valves and Rotary Airlock Valves
Double-Cone valves:
As dust collects in the hopper, the weight of the dust pushes down the counterweight of the top flap and dust discharges downward. The top flap then closes, the bottom flap opens, and the material falls out. This type of valve is available in gravity-operated and motorized versions.
Rotary Airlock valves:
The valve is designed with a paddle wheel that is shaft mounted and driven by a motor. The rotary valve is similar to a revolving door; the paddles or blades form an airtight seal with the housing, and the motor slowly moves the blades to allow the dust to discharge from the hopper.
Screw Conveyors:
After the dust leaves the discharge device it is transported to the final disposal destination by screw conveyers. Screw conveyors can be used as discharge devices when located in the bottom of the hopper or as a separate conveyor to move dust after it is discharged. Screw conveyers employ a revolving screw feeder to move the dust through the conveyor.
Uma supplies all this product for the Dust Discharging System
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