A bag dust collector(also called baghouse,bag filter,or fabric filter)is a high-efficiency dry-type industrial air pollution control device that captures airborne dust and particulate matter from industrial exhaust streams using fabric filter bags.It is the most widely used solution for industrial dust removal,valued for its 90%+filtration efficiency,even for fine particles down to 0.3μm.

Working Principle

Filtration:Dust-laden gas enters the collector’s housing.Large particles drop into the hopper by gravity;fine particles are trapped on the outer surface of filter bags as air passes through the porous fabric.

Clean Air Discharge:Clean air flows through the bags into the upper clean air chamber,then exits via the outlet.

Bag Cleaning:As dust builds up,pressure drop rises.The cleaning system activates(e.g.,pulse-jet)to dislodge dust cakes from the bags,restoring efficiency.

Dust Collection:Dislodged dust falls into the hopper and is discharged through an ash discharge valve.

Main Components

Housing:Divided into upper(clean air chamber),middle(filtration chamber),and lower(hopper)sections.

Filter Bags:The core element,made of polyester,fiberglass,or PTFE,tailored to dust properties and temperature.

Cage:A metal frame that supports filter bags to maintain shape.

Cleaning System:Typically pulse-jet(compressed air pulses),reverse-air,or mechanical shaker.

Hopper&Discharge Valve:Collect and remove separated dust.

Fan&Control System:Provides airflow and automates cleaning/operation.

Key Types

Pulse-Jet Bag Collector:The most common design.Uses high-pressure compressed air pulses to clean bags while online;ideal for continuous operation.

Reverse-Air Bag Collector:Cleans bags with low-pressure reverse airflow;simple,reliable,suited for heavy dust loads.

Mechanical Shaker Bag Collector:Uses mechanical vibration to shake off dust;for low dust concentration and intermittent use.

Core Advantages

High Efficiency:Captures 90%+of particles≥0.3μm,meeting strict emission standards.

Wide Adaptability:Handles various dust types(sticky,abrasive,high-temperature)and high dust concentrations.

Stable Operation:Simple structure,low failure rate,no high-voltage components.

Easy Maintenance:Modular design allows quick bag replacement;automated controls reduce labor.

Cost-Effective:Lower long-term operational costs despite moderate initial investment.

Common Applications

Cement,Steel&Metallurgy:Kiln,furnace,and sintering plant exhaust.

Power Plants:Coal-fired boiler flue gas filtration.

Woodworking&Furniture:Sanding and cutting dust collection.

Food&Pharmaceuticals:Milling,mixing,and packaging dust control.

Chemical&Mining:Process dust and ore dust removal.

Waste Incineration:Flue gas particulate removal.

Technical Specifications(Typical)

Airflow:1,000–1,000,000 m³/h

Filtration Area:10–10,000 m²

Filter Bag Material:Polyester(≤130°C),Fiberglass(≤260°C),PTFE(≤280°C)

Cleaning Pressure:0.3–0.6 MPa(pulse-jet)

Emission Concentration:≤30 mg/Nm³(even≤10 mg/Nm³for optimized designs)