Case Study: Dust Collector Filter Bags and Cages for Chemical Powder Manufacturing Facility
Chemical powder manufacturing processes, including grinding, screening, mixing and packaging, generate large volumes of fine chemical dust, which poses serious risks of workshop pollution, equipment wear, and even dust explosion hazards. Meanwhile, ultrafine powder escape leads to product loss and fails factory environmental emission standards. This case study focuses on a large fine chemical powder manufacturing plant producing pharmaceutical intermediates and chemical additives. The facility upgraded its pulse jet dust removal system with customized filter bags and filter cages, effectively solving ultra-fine dust emission and system blockage issues. This article details the on-site working conditions and full technical specifications of the applied filter bags and cages.
The factory runs 24-hour continuous production with multiple powder processing lines, producing fine chemical powders with particle sizes ranging from 1 μm to 80 μm. The original dust collector adopted ordinary fiber filter bags and thin-walled common cages, which suffered from frequent dust adhesion, bag deformation, poor ash cleaning effect and short service life. To standardize technical parameters and support on-site operation and maintenance, the factory’s actual working conditions and matched dust removal accessory specifications are sorted in the table below.
|
Category |
Parameter Item |
Technical Data |
|
On-Site Working Conditions |
System Operating Mode |
24-hour continuous pulse jet dust removal |
|
Flue Gas Temperature |
25–65°C (normal temperature, occasional instantaneous high temperature) |
|
|
Workshop Atmosphere |
Slightly acidic, dry dust, easy to adhere and agglomerate |
|
|
Dust Particle Size |
1–80 μm (main ultra-fine powder: 1–10 μm) |
|
|
System Wind Pressure |
0.3–0.5 MPa stable operating pressure |
|
|
Dust Concentration |
800–1200 mg/m³ at equipment inlet |
|
|
Dust Collector Filter Bag Specs |
Material |
Needled PTFE (polytetrafluoroethylene) with surface singeing treatment |
|
Dimension |
Φ160×6000 mm standard industrial size |
|
|
Filtration Precision |
0.5 μm ultra-fine interception |
|
|
Max Operating Temperature |
260°C continuous resistance |
|
|
Surface Treatment |
Waterproof, oil-proof and anti-adhesion finishing |
|
|
Air Permeability |
180–220 L/dm²·min |
|
|
Service Life |
12–18 months under continuous operation |
|
|
Filter Cage Specs |
Structure Type |
Integral one-piece straight cage, no split connection |
|
Material & Coating |
Carbon steel with organic silicon anti-corrosion coating |
|
|
Wire Diameter |
3.8 mm high-strength steel wire |
|
|
Ring Spacing |
80 mm uniform spacing, anti-deformation |
|
|
Matching Size |
Fully adapted to Φ160×6000 mm filter bag |
Aiming at the characteristics of fine chemical powder such as easy adhesion, small particle size and slightly acidic corrosion, the plant selected PTFE filter bags and anti-corrosion filter cages. The PTFE material features excellent acid and alkali corrosion resistance and ultra-fine dust interception capability. The surface singeing and anti-adhesion treatment effectively prevents fine powder from embedding into the filter fiber gaps, solving the long-standing problem of difficult ash cleaning. The matched high-strength silicone-coated filter cage has smooth surface without burrs, which avoids filter bag wear and puncture, and maintains stable three-dimensional support for the filter bag during frequent pulse jet cleaning.
After six months of on-site continuous operation, the optimized dust removal system achieved stable and efficient operation. The workshop dust emission concentration is reduced to below 20 mg/m³, fully meeting national environmental protection discharge standards. The pulse ash cleaning efficiency is significantly improved, and the system pressure difference remains stable at 800–1000 Pa without frequent overload alarms. The filter bags show no dust hardening or blockage, and the filter cages maintain complete structural stability without deformation or corrosion. The replacement cycle of accessories is greatly extended, reducing manual maintenance frequency and production downtime loss.
This case proves that targeted selection of filter bags and cages according to chemical powder production working conditions is the key to efficient and stable dust removal. The combination of anti-adhesion high-precision PTFE filter bags and anti-corrosion high-strength filter cages perfectly adapts to fine chemical dust working conditions, realizing environmental compliance, production cost reduction and workshop safety improvement for chemical manufacturing enterprises.
