Views: 0 Author: Site Editor Publish Time: 2025-06-05 15:09:25
The core of industrial dust removal system lies in the filter bag, and its selection directly affects the efficiency and cost. The key to selection lies in the accurate matching between dust characteristics and dust collector type.
Material is the basis of resisting dust erosion, which needs to be strictly selected according to dust:
Dust at room temperature (<130℃): polyester (polyester) high cost performance, good wear resistance (wood chips, coal powder, food dust), avoid strong acid and hydrolysis.
Medium and high temperature dust (130℃-190℃): PPS (polyphenylene sulfide): heat resistant, acid resistant (coal-fired boiler, waste incineration), avoid high oxygen environment. Aramid: temperature resistant and wear-resistant (asphalt, welding dust), avoid strong acid.
High temperature/high corrosive dust (>190℃ or highly corrosive): PTFE (polytetrafluoroethylene): top end can withstand high temperature (260℃) and strong corrosion (chemical, carbon black), with high price. Fiberglass: extremely high temperature resistance (280℃), low cost, needs to be coated (PTFE/graphite) to improve foldability (cement, steel).
Special requirements:
Moist and viscous dust: select PTFE coated filter material or oil and water resistant treatment filter material.
Explosive dust (aluminum powder, coal powder): must use anti-static filter material.
The filter bag design must match the dust collector cleaning method:
1. Pulse jet (mainstream):
Features: compressed air is sprayed in reverse in.stantly, and the cleaning force is strong.
Suitable filter bag: high fold resistance and high strength are required. Commonly used circular bags with support rings (outer filter). Material: polyester, PPS, PTFE (and coating).
Key: bag cage smoothness, verticality and flower plate sealing are very important.
2. Back-blowing/vibration type:
Features: air flow reverse or mechanical vibration cleaning, the force is mild.
Suitable filter bag: good flexibility and elastic recovery force are required. Commonly used is a round bag or flat bag (inner filter) without support ring. Material: treated glass fiber, polyester.
Key: The filter bag tension needs to be adjusted accurately.
3. Vibrating (gradually less):
Features: mechanical vibration cleaning, strong force.
Suitable filter bag: it needs to be extremely wear-resistant and foldable. It is mainly selected from specially treated glass fiber bags (old cement and electric power systems).
Key: strictly control the vibration parameters to prevent damage.
Temperature is the red line: long-term over-temperature operation leads to filter bag hardening failure, so be sure to reserve safety margin.
Chemical corrosion can not be ignored: acid and alkali components will destroy the fiber, so it is necessary to select corrosion-resistant materials (such as PTFE resistant strong acid and alkali).
The cleaning method determines the "constitution" of the filter bag: strong pulse requires resistant filter bags (such as PPS), weak reverse blow requires flexible filter bags (such as glass fiber processing), mismatch will greatly shorten the life.
Special requirements first: explosive dust must be anti-static; sticky/humidity dust is preferred to be coated or treated with oil and water resistance.
Quality and installation are key: poor quality filter bags and rough installation (bag cage burrs, unequal flower plates) are the main causes of early damage, with higher overall costs.
The selection of filter bags is a technical decision. It involves accurately matching the dust characteristics (temperature, corrosiveness, explosiveness, and adhesion) with the dust collector's cleaning method (pulse, reverse blow, or vibration), while also considering long-term operational costs, to achieve efficient and stable dust removal. The right choice can significantly enhance efficiency, extend service life by 2 to 3 times, and reduce overall maintenance costs by up to 40%, ensuring both environmental protection and economic benefits.
