Cartridge dust collectors work on the dual principle of surface filtration plus depth filtration. Dust-laden airflow enters the collector housing and, driven by negative pressure, passes through the cartridge media: large particles are intercepted on the cartridge's outer surface by gravity and inertial impaction, while fine particles are captured through sieving, adsorption and electrostatic attraction of the media fibers, and clean air passes through the cartridge and exits. As operation continues, an even dust cake forms on the cartridge surface, further improving fine-particle filtration efficiency — the "dust filters dust" effect — ensuring compliant dust emissions.
Frequently Asked Questions
We have compiled the questions customers ask most. If you cannot find your answer here, please contact us directly.
The core differences lie in media structure, filtration mode and application: 1) Cartridges use pleated media — large filtration area in a compact body, mainly surface filtration with thorough cleaning, suitable for dry, fine dust and confined working spaces; 2) Bags are cylindrical fabric media — mainly depth filtration, with good permeability and stronger temperature resistance, suitable for high-humidity, high-temperature and coarse dust conditions. Cartridge advantages: small footprint, high filtration precision and easy installation; bag advantages: adaptable to complex high-temperature conditions.
Five main factors: 1) Cartridge material and precision (PTFE membrane, polyester fiber and other media differ greatly in filtration precision); 2) Dust characteristics (particle size, humidity, stickiness and concentration); 3) Equipment air velocity (excessive filtration velocity lets dust penetrate the media and lowers efficiency); 4) Cleaning system condition (pulse pressure and injection frequency directly affect how well dust is removed from cartridges); 5) Equipment sealing (housing air leakage causes dust-laden airflow to short-circuit and reduces filtration performance).
Common industrial cartridge materials and their applications: 1) Standard polyester fiber — regular dry dust (grinding, cutting, wood dust) at ambient temperature (≤120°C), cost-effective; 2) PTFE-membrane polyester — fine, oily and slightly sticky dust; the membrane prevents dust adhesion and allows thorough cleaning, with filtration precision down to 0.3μm; 3) Anti-static polyester — flammable and explosive dust such as coal, aluminum and magnesium powder, eliminating static buildup hazards; 4) High-temperature media — for hot flue gas at 120–240°C.
The calculation is based on air volume and filtration velocity: 1) Confirm the collector's rated air volume; 2) Select a standard filtration velocity by dust type (0.8–1.2 m/min for regular dry dust, 0.6–0.8 m/min for fine dust); 3) Calculate total filtration area = total air volume ÷ filtration velocity; 4) Based on the area of a single cartridge, calculate the required quantity, reserving a 10–20% margin to avoid overload. Excessive filtration velocity leads to over-velocity operation and rapid cartridge clogging.
No. Excessively high precision means smaller media pores and greatly increased airflow resistance, which can reduce equipment suction, clog cartridges quickly, and increase cleaning frequency and energy consumption; too low a precision fails to capture fine dust and causes excessive emissions. Match precision to the conditions: standard precision for ordinary industrial dust; for strict emission requirements and fine dust, membrane high-precision cartridges are recommended.
Key installation points: 1) Distinguish inner and outer sides — the pleated outer side is the air-inlet face and the inner side the outlet; installing backwards is strictly prohibited; 2) Ensure the top seal ring is tight and aligned with no looseness or offset to prevent air leakage; 3) Tighten bolts evenly to avoid cartridge deformation and gasket misalignment; 4) Clean debris from the housing before installation to avoid scratching the media. If a cartridge is installed backwards, dust enters its interior and cannot be removed by pulse cleaning, quickly clogging the cartridge and causing loss of suction and excessive emissions.
Common causes: 1) New cartridge media has dense pores and higher initial resistance — after 1–2 hours of operation, once a thin dust layer forms, suction returns to normal; 2) The pulse cleaning system is not turned on, so dust on new cartridges cannot be removed in time; 3) Blocked ducts or abnormal fan speed. After external faults are ruled out, slightly low initial suction is normal.
Continuous 24-hour operation is possible under design conditions, provided: 1) Filtration velocity, operating temperature and dust characteristics match the cartridge requirements; 2) The cleaning system works properly on schedule. Long-term full-load operation with untimely cleaning causes dust caking on cartridges, continuously rising resistance, accelerated media aging and damage, and greatly shortened service life.
Two mainstream cleaning methods: 1) Automatic pulse cleaning — the mainstream method; a momentary high-pressure air blast shakes dust off the cartridge surface, thorough and highly automated, suitable for most dry dust conditions; 2) Manual shaking — used by small simple collectors; dust is shaken off by hand, suitable for low-concentration, coarse dust, with average results. Sticky or moist dust cannot be removed by conventional cleaning and tends to cake and clog.
Standard pressure for normal conditions is 0.3–0.5 MPa. 1) Too low: insufficient injection force — surface dust cannot detach completely; long-term accumulation raises resistance and lowers suction. 2) Too high: the high-pressure jet repeatedly impacts the media, easily causing pleat deformation, media damage and seam cracking, shortening service life, and causing dust re-entrainment.
The cleaning cycle is adjusted by dust concentration: 1) Low-concentration dust (woodworking, light grinding): clean every 10–15 min; 2) High-concentration dust (sandblasting, cutting, polishing): every 3–5 min; 3) Ultra-low-concentration conditions can use intermittent cleaning. Continuous cleaning is not recommended—excessive cleaning wears the media and destroys the dust cake on the cartridge surface, reducing fine-dust filtration efficiency.
Root causes: 1) Cartridge damaged, cracked or punctured, dust passes through directly; 2) Aged/dislodged/loose seal gaskets cause dust-laden air short-circuiting; 3) Cartridge grade too coarse to capture fine dust; 4) Excessive cleaning pressure penetrates the media surface. Solution: stop and inspect cartridge integrity, replace damaged cartridges and seals, and use high-grade media.
Common triggers: 1) Wet, sticky dust that cannot be cleaned, forming hard cake; 2) Over-high filtration velocity causing deep media clogging; 3) Insufficient cleaning pressure or unreasonable pulse interval, incomplete cleaning; 4) High ambient humidity causing moisture adhesion; 5) Aged cartridges with clogged media. Solution: adjust conditions and optimize cleaning parameters; replace cartridges directly when caking is severe.
Somewhat. If cartridges are loosely installed or poorly fixed, airflow impact during operation causes them to shake and collide, leading to cabinet vibration and increased noise. Severe clogging also unbalances duct resistance and overloads the fan, producing abnormal sounds. Fan faults and pipe resonance can also cause noise and should be checked one by one.
Replace immediately if any of the following occur: 1) Media damaged, cracked or punctured with dust escaping the outlet; 2) Severe caking where resistance stays high after washing/multiple cleanings and suction drops sharply; 3) Cartridge deformed or pleats collapsed, seal failed; 4) Media aged/powdered, filtration accuracy lost; 5) Service life far exceeds standard with severely degraded performance.
Mixing is not recommended. Old and new cartridges differ greatly in resistance; airflow favors the low-resistance new ones, leaving old cartridges with minimal flow and accelerated clogging, while overall filtration efficiency becomes unbalanced and the collector's performance suffers; it also shortens the remaining life of old cartridges. Batch replacement is advised.
Anti-static cartridges must be used, and: 1) The whole cartridge is anti-static—both media and cage are anti-static materials to prevent static accumulation; 2) The equipment is fitted with explosion vent panels, spark arresters and other explosion-proof accessories; 3) High-pressure over-cleaning is strictly prohibited to avoid secondary dust lifting and explosion risk; 4) Clean cartridge dust regularly to prevent pile-up and spontaneous combustion.
1) Thoroughly clean before shutdown, removing residual dust from the cartridge surface; 2) Store in a dry, ventilated place, avoiding moisture, rain and sun to prevent media caking and aging; 3) Seal the inlet/outlet to keep dust and debris out; 4) If shut down over 1 month, manually clean once and check seal integrity before restart.
Low temperature alone does not damage standard cartridges, but it easily causes air humidity to condense, leading to dew on the cartridge surface and dust adhesion, causing clogging and caking. In winter, keep the equipment insulated to avoid cabinet condensation, slightly adjust the cleaning cycle, and clear light adhesion promptly to prevent hardening.
