Bag dust collectors, also known as bag filters, operate by passing dusty gas through filtering materials, where dust particles are captured. The collection of coarse dust particles primarily relies on inertial collision, while fine dust particles are captured mainly through diffusion and sieve action. The efficiency of dust collection by bag dust collectors depends on various factors, but mainly on the filter material. The filter material for bag dust collectors is fabric or felt made from synthetic fibers, fibers, or glass fibers. The fabric or felt is then sewn into cylindrical or flat dust filter bags as needed. The appropriate filter material is selected based on the properties of the flue gas. Typically, when the flue gas temperature is below 120°C and the filter material is required to be acid and durable, polyester plush and polyester are commonly used. For treating high-temperature flue gas (<250°C), graphitized glass fiber fabric is primarily chosen. In some cases, carbon fiber filter materials are also used.
Baghouse dust collector equipment daily operation:
During the daily operation of the bag dust collector equipment, changes in operating conditions or the occurrence of certain malfunctions can affect the normal operation and performance of the equipment. Regular inspections and appropriate adjustments are necessary to extend the life of the filter bags, reduce energy consumption, and recover useful materials. Issues to be aware of include:
1. Operation Records
Each ventilation and dust removal system must be equipped with and have testing instruments installed, which should be regularly measured during daily operation and accurately recorded. This allows for judgments to be made based on the system's pressure difference, the temperatures of the intake and outlet gases, the voltage and current of the main motor, and other numerical values and changes, ensuring timely troubleshooting and maintaining normal operation.
Issues identified through records include: the operating condition of the dedusting mechanism, the working condition of the filter bags (issues such as damage, clogging, and糊袋), as well as changes in the system air volume.
2. Fluid Resistance
U-tube differential pressure gauges can be used to assess operating conditions: an increase in differential pressure indicates clogging of the filter bag, condensation of water vapor on the filter bag, failure of the cleaning mechanism, excessive ash accumulation in the ash hopper leading to clogging of the filter bag, or an increase in gas flow. A decrease in differential pressure suggests a damaged or loose filter bag, blockage in the inlet side piping, or valves closed. There may be leakage between the housing or compartments, or a reduction in fan speed.
3、
Baghouse deduster equipment requires special attention to measures against combustion and fire accidents. When handling combustible gases or high-temperature gases, it is common for unburned dust, sparks, and flammable gases to enter the system. Some dust particles have the property of spontaneous combustion or are electrically charged. Additionally, the majority of filter material is flammable and easily generates static electricity through friction. Under such operating conditions, there is a risk of combustion and accidents, which can have severe consequences. It is essential to consider implementing fire prevention and explosion-proof measures, such as:
1) Install a combustion chamber or a spark collector in front of the dust collector to ensure complete combustion of unburned dust and gases or to capture sparks.
2) Measures to prevent static charge accumulation are implemented, with each component grounded using conductive materials or by adding conductive fibers during the filter material manufacturing process.
3) Prevent the accumulation or buildup of dust to avoid spontaneous combustion.
4) Ventilation and air exchange must be conducted before personnel enter the bag room or pipeline for inspection or maintenance.
