Bag Filter Dust Collector
Regulations
• Environmental Quality Act 1974
– Amendment act 2012
– Section 49A (Competent person)
• Clean Air Regulations 2014
– Regulation 7 (APCS)
– Regulation 9 (PM)
– Regulation 10 (Record)
What is Air Pollution?
• The presence of contaminants (pollution) in
air, in quantities or duration that can injure
human, plant, animal life or materials
• Pollutant: gas, dust, fume (smoke), odour
• Source: natural, industrial
Source of Industrial Air Pollution
Mechanical Thermal Chemical
process process process
• Blasting • Heating • Coating
• Crushing • Burning • Printing
• Milling • Melting • Painting
Introduction to APCS
• Air Pollution Control System, 3 types:
1. Shaker cleaning
2. Reverse-air cleaning
3. Pulse-jet cleaning
• Importance:
– To comply with law & requirement
– Safety and health
– Indoor & outdoor environment
– Protect machinery & facilities
Bag Filter Dust Collector
• Also known as “bag house”
• Use filter to separate dust particulates from dusty
gases
• Most efficient and cost effective type of dust
collector
• Can achieve 99% collection efficiency
Bag Filter Dust Collector
/ Dust collector
Bag Filter Dust Collector
Bag Filter Dust Collector
Suction hood • Capture dust emission at source
Ducting • Transport dust to dust collector
Dust collector • Remove dust from air
Fan • Provide air flow to the system
Chimney / Stack • Transport clean air our to environment
1. Suction Hood
1. Suction Hood
• Capture dust emission at source
• Place hood as close to the source of contaminant
(location of hood)
• Most effective hood – require min exhaust
volumes
• Rate of air flow through the hood
• Shape of hood
2. Ducting
2. Ducting
• Transport dust to dust collector
• Select appropriate dust size
• Duct velocity: 18 – 23 m/s
– To prevent dust settlement in the duct → block!
2. Ducting
• Every section has different diameter
• To maintain constant duct velocity
3. Dust Collector
Mechanical
Pulse-jet dust
shaker dust
collector
collector
Reverse air
dust collector
Pulse-jet Dust Collector
Pulse /
solenoid valve Electronic
timer box
Compressed air (from compressor)
FR –
Filter Regulator
Compressed
air tank
Pulse-jet Dust Collector
Pulse-jet Dust Collector
Blow tubes/ blow pipes
Filter installation at cell plate/ bag plate/ tube sheet
Components of Dust Collector
Key design factors of Dust Collector
Particle characteristics (temp., corrosive, pH, abrasive, moisture, size, etc.)
Air to cloth ratio (filter velocity)
Can velocity (filter passage velocity)
Collection efficiency
Filter media (material, coating)
Pressure drop (differential pressure)
4. Fan
• To provide air flow and static pressure to the system
• Types: Axial flow fan Centrifugal fan
• Flow parallel to shaft • Commonly used in
• Lower pressure APCS
• Large air volume • Flow perpendicular to
• Higher noise level shaft
• Higher pressure
• High air volume
• Lower noise level
Centrifugal Fan
• Less space requirement
Direct driven • Less maintenance
(no belt) • Constant fan speed
• Fan attached directly to motor
• More space requirement
• More maintenance
Belt driven
• Speed can be regulated
• Fan connected to motor via belt
5. Chimney
• To transport clean air to the environment
Chimney Height
• At least 3 meters higher from tallest structure within 50 meter radius
Chimney Height
• At least 3 meters higher from tallest structure within 50 meter radius
Chimney Rain Cap
• Acceptable • Unacceptable
Chimney Sampling Port
