Plugging of the discharge on the dust collection system can be a nuisance and a headache. Sometimes the plant personnel don’t even know this is occurring and the hopper on the dust collector can fill completely with dust.

Maintenance Tip

In the winter this is a particular problem when the walls of the hopper may build up with dust caused by condensation. Large pieces of dust may break off and plug the outlet to the rotary valve or to a barrel.

The condensation forms when the warm air of the plant comes in contact with cold air inside the dust collector. Dew point is then reached and moisture will be present on the steel walls of the dust collector. In our environment and depending on the dust the largest opening possible or large rotary valve is preferred.

Solution

First install a bin level indicator in the hopper. If you don’t have one, install it approximately 3′-0″ above the discharge point. Make sure the hopper is clear of ledges, bolts, or screws protruding into the hopper wall. Seal all air leaks. Check the rotary valve or drum to ensure you have a proper seal.

Turn on the dust collection unit one half hour prior to running material through the system. Give the dust collector a chance to warm up and drive off the moisture.

At the end of the day when you shut down the system, allow the rotary valve and take-away device to run for 15 minutes after the main suction fan is turned off. Inspection of the discharge system is always important checking for leaks and potential problems.

A correct discharge working properly will prolong the bag life and reduce energy operating costs.