The main points of bag filter design mainly include the following aspects
Handling airflowThis is a key factor in determining the size of the baghouse. The treatment air volume is mainly determined by the actual treatment air volume of the system, considering the future process changes, the air volume design should increase the safety factor of 5% to 10% on the basis of the normal air volume.
Filter air velocity: The selection of filter wind speed will be affected by factors such as ash cleaning method, ash cleaning system, dust characteristics, filter material characteristics, predetermined equipment resistance, and inlet dust concentration. Generally speaking, if the strong ash cleaning method (such as pulse injection) is adopted, the ash cleaning cycle is shorter, the inlet dust concentration is lower, the dust particles are larger, the viscosity is smaller, and the dust containing gas at room temperature is treated, and the filter material can be higher when using needle felt filter material or peritoneal filter material. On the contrary, if weak force cleaning is used (such as back-blowing ash cleaning, vibration cleaning), to deal with high-temperature flue gas, the dust is fine, viscous and small, and the dust density is low.
Filter material: The appropriate filter material should be selected in combination with the actual working conditions of the flue gas.
Cabinet structureThe box structure of the bag filter mainly includes the box (dust chamber, clean air chamber and ash hopper), filter elements (filter bag, bag cage), ash cleaning device, ash unloading and ash conveying device, and safety maintenance facilities. When designing, it is necessary to consider the compressive strength of the box, the thickness and margin of the flower plate, the cross-sectional wind speed of the clean air chamber, the volume of the ash hopper and the ash unloading equipment and other factors.
Temperature considerationsThe use temperature of the bag filter is an important basis for design, and factors such as gas temperature, ** and cooling method should be taken into account.
Gas composition: Most of the gases handled by the baghouse are ambient air or kiln flue gas. When designing, the effects of moisture, particulate matter, and other components in the flue gas on the collector need to be taken into account.
In addition, the design of the bag filter also needs to consider factors such as process, equipment, electrical fabrication, installation, and existing production practices. When designing, it is also necessary to take into account factors such as the structure of the equipment, the possibility of manufacturing, transportation and on-site construction of the main components, as well as the investment, operation and maintenance costs of the equipment.
The above information is for reference only, it is recommended to consult the bag filter manufacturer or professional engineer for more professional advice.