Global Fabric Filters Market: Overview
Fabric filters is one of the most common techniques used for particulate emission reduction in many industrial applications. They are designed to collect particles in the sub-micrometer range with 99.9% control efficiency. Fabric filters are typically used to remove particles from exhaust air streams that are generated by industrial processes, where the clean air is re-circulated back into the plant to help offset space heating needs. They are used in the chemical industries, power generation sector, steel, food, cement, incineration and pharmaceutical industries.
Fabric filtration systems are also referred to as baghouses and consist of basic components such as filter medium and supports, filter cleaning device, collection hopper and shell. Filters are called as bags and these cylindrical bags are vertically hanged in the fabric filter shell. Number of bags in each shell varies from hundreds to thousands. Dirty gas is either pushed away through the fabric filter by a fan. When the dust laden gas is pushed through the fabric filter, the collector is called as positive pressure baghouse. When the fan is placed after the baghouse, the dust laden gas is removed through the fabric filter and is called as negative pressure baghouse.
As the dirty gas passes through the filter, the dust trapped from the gas stream collects in a dust cake on the surface of the bags. When the bags are cleaned, collected particles fall into a hopper and are removed. One of the major design parameters of the fabric filters is the air to cloth ratio. This ratio depends on the type of cloth used, humidity, particulate matter characteristics, particle size distribution of the material being collected and bag spacing. As the air to cloth ratio increases, seepage through the filter medium, gas velocities at the baghouse inlet and velocities around the bags also increase. Higher air to cloth ratios also tends to increase the potential for fabric holes.
Global Fabric Filters Market: Segmentation
Fabric filters are typically segmented based on the type of mechanism used to clean the filter medium. Most common type of fabric filters are pulse jet, reverse air and shaker. Pulse jet filter uses compressed air for routine fabric cleaning. The filter bags are supported on interior cages and are hung from a tube sheet near the top of the baghouse. Dust laden gas is passed from the outside to the inside of the bag, depositing dust on the outside surface of the bag. Bags from pulse jet fabric are made from felted materials, which are formed from randomly placed fibres compresses into a mat and attached to a loosely woven backing material. The gas to be filtered can enter the collector at any point beneath the tube sheet. Reverse air cleaning mechanism is the simplest cleaning mechanism in comparison to others.
It is accomplished by stopping the flow of dirty gas into the compartment and backwashing the compartment with clean and low pressure air. Dust is removed when the bags flex and the dust cakes break and fall into the hopper. Shaker collectors are similar to reverse air fabric filters and are inspected in the same manner. The only difference is the way the bags are hung and the way dust is dislodged from the bags. Each set of bags is mechanically outside the fabric filter shell. On the regular basis, one compartment is isolated from the gas stream and the bags are shaken side to side or up and down to dislodge the dust cake. After cleaning, the compartment is brought back on line.
Global Fabric Filters Market: Drivers, Restraints, and Competitive Landscape
Stringent government regulations and industry participation are some of the key drivers of the fabric filter market. However, high manufacturing cost of fabric filter can hinder the market’s growth. Advancements in new technologies and rapid industrialization bring new opportunities in the fabric filter market. Major inspection areas for fabric filters system are stack pressure gauges, doors, hoppers, vent exists, bags and cages.
Some of the key players in the business of fabric filters are BGF Industries Inc, American Fabric Filter Company, Anush Filters & Fabrics, Total Air Pollution Control Pty Ltd and Amerex Technologies among others.
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