Product Introduction

Since its introduction in the 1950s, bag filters have been widely used and continuously improved, achieving great development in purifying dusty gases. Due to the dust cleaning technology, the gas to cloth ratio has been greatly improved, making it characterized by large air volume, small footprint, purification, operation, simple structure, and low maintenance. The dust removal efficiency can reach the above level. It is a mature and relatively complete dust removal equipment.

The dusty gas enters the filtering chamber through the ash hopper (or a spacious open flange at the bottom), and the coarser particles directly fall into the ash hopper or ash bin. The dust gas is filtered by the filter bag, and the dust is retained on the surface of the filter bag. The clean gas passes through the bag mouth to the clean air chamber and is discharged into the atmosphere by the fan. When the dust on the surface of the filter bag continues to increase, causing the equipment resistance to rise to the set value, the time relay (or micro differential pressure controller) outputs a signal, and the programmable controller starts to work. The pulse valves are opened one by one, and the compressed air is sprayed through the nozzle to clean the filter bag, causing the filter bag to suddenly expand. Under the action of reverse airflow, the dust attached to the surface of the filter bag separates from the filter bag and falls into the ash hopper (or ash bin), and the dust is discharged After the dust blowing is completed, the dust collector resumes normal operation.

When the bag filter is working normally, the dusty gas enters the ash hopper through the air inlet. Due to the expansion of the gas volume, some of the coarser dust particles fall into the ash hopper due to inertia or natural settling, while the rest of the dust particles rise into the bag chamber with the airflow. After being filtered by the filter bag, the dust particles are trapped on the outside of the filter bag. The purified gas enters the upper box from the inside of the filter bag and is then discharged into the atmosphere through the valve plate hole and exhaust outlet, thus achieving the purpose of dust removal. As the filtration continues, the resistance of the dust collector also increases. When the resistance reaches a value, the dust cleaning controller issues a dust cleaning command, first closing the lifting valve plate and cutting off the filtered airflow; Then, the dust cleaning controller sends a signal to the pulse solenoid valve, and as the pulse valve sends high-pressure reverse airflow used for dust cleaning into the bag, the filter bag swells and produces strong shaking, causing the dust on the outside of the filter bag to shake off, achieving the purpose of dust cleaning. Due to the fact that the equipment is divided into several box areas, the above process is carried out box by box. While one box area is cleaning, the remaining box areas are still working normally, ensuring the continuous and normal operation of the equipment. The key to being able to handle dust lies in the cleaning time required for this type of strong cleaning (only 0.1-0.2 seconds for one spray).

Schematic diagram of bag filter section

Workshop