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Difference between revisions of "Fabric Filters"
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[[Category:Filtration]]{{Knoppen}} | [[Category:Filtration]]{{Knoppen}} | ||
[[File:Fabric_Filters_02.jpg|thumb|right|Fabric filter]] | [[File:Fabric_Filters_02.jpg|thumb|right|Fabric filter]] | ||
[[File:Fabric_Filters_01.jpg|thumb|right|Parts of Fabric filter]] | [[File:Fabric_Filters_01.jpg|thumb|right|Parts of Fabric filter]] | ||
'''Fabric Filters''' or [[Baghouses]] use filtration to separate dust particulates from dusty gases. They are one of the most efficient and cost effective types of [[Dust Collecting Filters]] available and can achieve a collection efficiency of more than 99% for very fine particulates. | |||
Dust-laden gases enter the baghouse and pass through fabric bags that act as filters. The bags can be of woven or felted cotton, synthetic, or glass-fiber material in either a tube or envelope shape. | Dust-laden gases enter the baghouse and pass through fabric bags that act as filters. The bags can be of woven or felted cotton, synthetic, or glass-fiber material in either a tube or envelope shape. | ||
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==Types of Bag Cleaning== | ==Types of Bag Cleaning== | ||
Baghouses are characterized by their cleaning method. | Baghouses are characterized by their cleaning method. | ||
===Shaking=== | ===Shaking=== | ||
A rod connects to the bag is powered by a motor that provides motion to remove the caked on particles. The speed and motion of the shaking depends on the design of the bag and composition of the particulate matter. Though, generally shaking is horizontal. The top of the bag is closed and the bottom is open. When shaken the dust collected on the inside of the bag is set free. During the cleaning process, no dirty gas flows through a bag while the bag is being cleaned. This redirection of air flow illustrates why baghouses must be compartmentalized. | A rod connects to the bag is powered by a motor that provides motion to remove the caked on particles. The speed and motion of the shaking depends on the design of the bag and composition of the particulate matter. Though, generally shaking is horizontal. The top of the bag is closed and the bottom is open. When shaken the dust collected on the inside of the bag is set free. During the cleaning process, no dirty gas flows through a bag while the bag is being cleaned. This redirection of air flow illustrates why baghouses must be compartmentalized. | ||
===Reverse Air=== | ===Reverse Air=== | ||
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===Pulse Jet=== | ===Pulse Jet=== | ||
This type of baghouse cleaning (also known as pressure-jet cleaning) is the most common. A high pressure blast of air is used to remove dust from the bag. The blast enters the top of the bag tube, temporarily ceasing the flow of dirty air. The shock of air causes a wave of expansion to travel down the fabric. The flexing of the bag shatters and discharges the dust cake. The air burst is about 0.1 second and it takes about 0.5 seconds for the shock wave to travel down the length of the bag. Due to its rapid release, the blast of air does not interfere with contaminated gas flow. Therefore, pulse-jet baghouses can operate continuously and are not usually compartmentalized. The blast of compressed air must be powerful enough to ensure that the shock wave will travel the entire length of the bag and fracture the dust cake. | This type of baghouse cleaning (also known as pressure-jet cleaning) is the most common. A high pressure blast of air is used to remove dust from the bag. The blast enters the top of the bag tube, temporarily ceasing the flow of dirty air. The shock of air causes a wave of expansion to travel down the fabric. The flexing of the bag shatters and discharges the dust cake. The air burst is about 0.1 second and it takes about 0.5 seconds for the shock wave to travel down the length of the bag. Due to its rapid release, the blast of air does not interfere with contaminated gas flow. Therefore, pulse-jet baghouses can operate continuously and are not usually compartmentalized. The blast of compressed air must be powerful enough to ensure that the shock wave will travel the entire length of the bag and fracture the dust cake. | ||
===Sonic=== | ===Sonic=== | ||
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== | ==Parts== | ||
* Clean plenum | |||
* Dusty plenum | |||
* [[Bags|Bag]], cage, [[Venturi Tubes|venturi assembly]] | |||
* Tubeplate | |||
* [[Screw Conveyors|Screw conveyor]] | |||
* Compressed air header | |||
* Blow pipe | |||
* [[Filter Housings|Housing]] and [[Hoppers|hopper]] | |||