In reverse-air bag houses, the bags are fastened onto a cell plate at the bottom of the bag house and suspended from an adjustable hanger frame at the top. Dirty gas flow normally enters the bag house and passes through the bag from the inside, and the dust collects on the inside of the bags.
Reverse-air bag houses are compartmentalized to allow continuous operation. Before a cleaning cycle begins, filtration is stopped in the compartment to be cleaned. Bags are cleaned by injecting clean air into the dust collector in a reverse direction, which pressurizes the compartment. The pressure makes the bags collapse partially, causing the dust cake to crack and fall into the hopper below. At the end of the cleaning cycle, reverse airflow is discontinued, and the compartment is returned to the main stream.
HYBRID FILTER
Hybrid filters are used most frequently in the cement industry and for boilers, fired with coal or biomass. Often, when operating conditions change or production capacity is to be expanded, the existing filter installation may no longer fulfill requirements. In such cases, the Electrostatic Precipitator can be converted into a hybrid filter to comply with the new conditions without the need to replace the entire equipment.