Filter Bags for Pulse Jet Dust Collector
The pulse jet bag filter dust collector cleaning system removes particulate matter and dust from the surface of internal filter media with bursts of compressed air. Pulse jet bag filters or dust collector filter bags are the most common type of particulate air pollution control equipment found in workplaces including factories, plants, warehouses and other industrial or commercial environments, to meet workplace air quality safety requirements and comply with CPCB/LPCB requirements for emissions.
Filter bags used in Pulse jet dust collector is the most prominent component of this type of dust collector. It is the heart of the dust collection process. The filter bags in the pulse jet dust collector are supported on the interior cage and are hung from a tube sheet near the top of the baghouse. The dirty air enters the tube from any point from the bottom and is passed through the filter from the outside to the turn inside of the bag. The filter bags absorb the dirt and pass the filtered air in the atmosphere. Excessive use of these filters allows dirt to stick around them and a stage arrives where the filters are chocked with dirt. The dirt of the filter bag is removed by entering a pulse of negative pressure compressed air which cleans the filter and the dirt cake falls down in the hopper. The excess pressure of the air can torn the filter. So to give the air a fixed path to travel through the bag a conical-shaped funnel is known as a venture. Also, a cage is placed inside the bag to avoid any disorientation caused by the difference in pressure. Bags should be cleaned regularly to avoid choking of the filter bags. Choking will decrease the efficiency of the filter bag and the air will not get properly filtered and will have some dirt in it.
Types Of Pulse Jet Filter Bags
Fabric used in filter bags
For the manufacturing of a filter bag a special type of non woven fabric is used. They are usually made up of twisted materials, which are formed from randomly placed fibers wrapped into a mat and added to a sloppy woven baking material. In short, these filter bags uses non-woven filter media. There are different types of fabric basenonwovend on the composition of materials. The special type of fabric used helps the dirty air to be released into, the atmosphere in clean form. The filter material is made up of weaving composite materials that capture the dirt from the air and passes clean air through them. The strong bond of the fiber material avoids air breakage or leaking.
Fabrics We Used
Polypropylene: Polypropylene is a synthetic thermoplastic polymer known for its excellent chemical resistance. Polypropylene filter bags are widely used in applications involving corrosive gases and liquids. They offer high tensile strength, good dimensional stability, and resistance to moisture, acids, and alkalis.
Polyester: Polyester filter bags are made from a synthetic fiber known for its exceptional strength and durability. They offer excellent resistance to abrasion, chemicals, and high temperatures. Polyester filter bags are commonly used in industries such as cement, pharmaceuticals, and food processing.
Polyamide: Polyamide, commonly known as nylon, is a synthetic polymer that offers high strength and dimensional stability. Polyamide filter bags are suitable for applications requiring fine filtration, such as paint booths, automotive manufacturing, and ink production. They provide good chemical resistance and are known for their high melting point.
Nomex (Aramid): Nomex, also known as aramid, is a flame-resistant synthetic fiber with excellent thermal stability. Nomex filter bags are widely used in high-temperature applications such as asphalt production, metal smelting, and waste incineration. They can withstand extreme temperatures without sacrificing filtration efficiency.
Ryton (PPS): Ryton, or polyphenylene sulfide (PPS), is a high-performance polymer known for its excellent chemical resistance and thermal stability. Ryton filter bags are commonly used in applications involving aggressive chemicals, flue gases, and corrosive environments. They can withstand high temperatures and maintain filtration efficiency in demanding industrial processes.
P-84: P-84 is a specialty synthetic fiber known for its excellent resistance to acids and alkalis. P-84 filter bags offer exceptional filtration efficiency and dimensional stability, making them suitable for applications such as waste incineration, coal-fired power plants, and cement kilns.
Fiber Glass: Fiber glass filter bags are made from woven or non-woven glass fibers. They possess high tensile strength and can withstand high temperatures and corrosive environments. Fiber glass filter bags are commonly used in applications involving hot gas filtration, such as metallurgical processes and incinerators.
Acrylic (Co-Polymer): Acrylic co-polymer filter bags are synthetic fibers known for their good resistance to chemicals, solvents, and acids. They offer high filtration efficiency and can operate in a wide temperature range. Acrylic filter bags are used in applications such as chemical processing, pharmaceuticals, and food manufacturing.
Acrylic (Homo-Polymer): Acrylic homo-polymer filter bags are another type of synthetic fiber with similar characteristics to acrylic co-polymer. They provide excellent filtration efficiency and resistance to chemicals and high temperatures. Acrylic filter bags are commonly used in processes where fine filtration and chemical resistance are required.
Each of these fabrics offers specific advantages and is selected based on factors such as the operating conditions, filtration requirements, and compatibility with the contaminants being filtered. By choosing the appropriate fabric for filter bags, industries can optimize filtration performance and ensure efficient and reliable dust collection.
These filter media are also coated laminated or processed further with some special techniques to give them the additional advantage. These finishes could be follows:
- Oil and water repellency
- Anti addition
- Anti Static
- PTFE membrane lamination
Shapes and sizes
The filter bags used in shaker dust collector is cylindrical in shape. The diameter of the filter bag varies from 100 mm to 200 mm and the length varies from 500 mm to 10000 mm.
Choose Top According To Your Requirement
Choose Bottom According To Your Requirement
Choose Seams According To Your Requirement
Advantages
The major advantage of the filter used in the pulsejet filter is its high-quality performance. The filter bags use a smaller area, which allows a large number of filters to be incorporated into a single pulse jet dust collector, thus increasing its efficiency. The strength of the filter is quite high. It has good air permeability which leads to the filtration of microdust also. The dust capacity of such filters is also very high.
Disadvantages
The disadvantage or rather we should say the limitation of filter bag is that it has high resistance. The operating life of the filter bags used is also low. The filter bag stands for three to five year only.
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