boiler bag dust collector

Boiler bag filter is a collection of over ten years of research and technological experience and achievements. It is a large-scale dust removal equipment with high air volume, good dust cleaning effect, high dust removal efficiency, reliable operation, easy maintenance, and small footprint. Widely used in the metallurgical industry for steelmaking blast furnaces, raw material coal injection preparation factories, building materials industry, power, chemical industry, carbon black, asphalt concrete mixing, boilers, flue gas dust removal and other industries for dust control and material recovery.

Boiler bag filter is a new and efficient bag filter developed on the basis of conventional short bag pulse dust collector. It not only combines the advantages of chamber back blowing and pulse blowing for dust cleaning, but also extends the filter bag, fully utilizing the powerful blowing effect of compressed air for dust cleaning. Overcoming the disadvantages of low intensity of back blowing and dust filtration in separate rooms, pulse blowing and dust filtration are carried out simultaneously, preventing dust reattachment and loss of control, thereby improving filtration speed, saving dust cleaning energy consumption, and extending the life of dust removal filter bags. The electrical control of the dust collector adopts a PLC programmable controller.

The gas purification method of the boiler bag filter is external filtration. The dust collector consists of an upper box, a middle box, an ash hopper, a filter bag assembly, a blowing device, a lifting valve, an unloader, an electromagnetic pulse valve, and a detection and control system. Adopting a lower intake chamber structure, during operation, dusty flue gas enters each unit ash hopper through the lower part of the middle box through the intake port. Large particle dust directly falls into the ash hopper due to inertial collision, natural settling, and other effects, while the remaining dust enters the filtering area of the middle box with the airflow. The dust accumulates on the outer surface of the filter bag, and the filtered clean gas is discharged through the filter bag through the upper box, lift valve, and exhaust pipe. The captured dust is sent to the buffer steel ash bin by the ash conveying and unloading device, and then pulled away by the ash transport vehicle for secondary reuse.

As the filtration process progresses, the amount of dust accumulated on the outer surface of the filter bag continues to increase, leading to a gradual increase in the resistance of the dust collector itself. When the amount of dust accumulated on the surface of the filter bag reaches a certain level, the dust cleaning control device (differential pressure or timing, manual control) sends a signal. First, the lift valve of a bag chamber is closed to cut off the filtered airflow in that chamber. Then, the electromagnetic pulse valve is opened, and compressed air is sent from the air storage tank through the air bag in a very short time sequence through various pulse valves and nozzles on the blowing pipe, inducing several times the amount of air sprayed into the filter bag, forming an air wave that causes the filter bag to expand rapidly from the bag mouth to the bottom and produce shock vibration. In addition, the reverse airflow effect causes the accumulated air outside the filter bag to flow rapidly. Dust shedding. After fully considering the settling time of dust (ensuring that the dust peeled off from the filter bag after spraying can effectively settle to the ash hopper, avoiding the phenomenon of dust adhering to the adjacent filter bag surface with the airflow after leaving the filter bag surface, and thoroughly cleaning the filter bag), the lift valve is opened, and the filter bag in this bag chamber returns to the filtering state while the next bag chamber enters the cleaning state. This process takes one cycle until the cleaning of the next bag chamber is completed. The LCM bag filter is composed of multiple independent chambers, and each chamber is cleaned in sequence without interfering with each other, achieving long-term continuous operation.