Dry Dust Collection Methods for Industrial Applications-gunaiyou

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Efficient removal of dust and debris from the air is a key factor for any industrial application. This is because airborne particles can pose a risk to the health and safety of personnel, degrade or damage equipment or the environment, and interfere with manufacturing processes. This article describes the four main types of dry dust collectors and how to select the right technology for your application.
The best dust collection method for your application depends on airflow characteristics, contaminant characteristics (particle size, humidity, etc.), environmental factors, efficiency, and regulatory requirements. In this article, we will focus on dry dust collectors, the four main types of dry dust collectors, and how to choose the right method for your application.
Dry dust collectors are commonly used in industry to remove dust, vapours, and vapors from polluted air streams with cleanable filters. As a rule, dry dust collectors are used for “clean” dust, free of oil and moisture (note that dry dust collectors can be successfully used for air streams with a high moisture content, if the moisture remains in the form of vapor when passing through the collector).
* Dry mechanical dust collectors. The most common dry mechanical dust collectors are cyclones, often used as pre-cleaners for other dust collection methods. Like many household vacuum cleaners, cyclones use rotational speed to create centrifugal force that separates dust and debris from the air stream. The rapid circular motion presses the debris against the walls of the cyclone. After separation from the air stream, dust particles fall into the lower hopper, and the purified air exits the cyclone.
* Collectors of dry materials. Dry material collectors use many different materials to filter contaminants from the air stream. The most common types of dry media traps are bag filters and cartridges. The bag filter will use a long fabric tube (bag) to suck in dirty air to trap dust inside or outside the bag, and clean the dust bag periodically for recycling or disposal, with clean air leaving the collector.
Container dust collectors work in a similar way, but instead of bags, they use a collapsible waste container. While many different media are used to meet specific application requirements, polyester bags are most commonly used in pulse jet bag filters, while cellulose mixed media substrates combined with surface treatment are most commonly used in pulse jet cartridge manifolds.
Dry mechanical (cyclone) dust collectors are generally limited to dust removal of 5-10 microns or more, while dry dust collectors can be used for a wide range of dust, fume and sub-micron fume applications. Cyclones are suitable for a wide range of air flow temperatures, while bag filters are typically used for air flows up to 500°F and cartridge manifolds up to 275°F.
The return air filter is a bag filter with dry material. The fabric bag is hung and stretched inside the dust container. When dirty air enters the device, debris is trapped on the inside of the bag and clean air is expelled through the bag. The device is cleaned periodically or after the amount of dust in the bag reaches a predetermined threshold.
As the bag is cleaned, the fan blows clean air in the opposite direction, breaking up the dust accumulated in the bag and releasing it from the fabric into the lower hopper. Since the cleaning process of the reversible air collector must be carried out offline, a backup unit is required to ensure continuous dust removal.
Return air collectors are most commonly used to collect large volume, high temperature dusts (eg in power plants and utilities). This technology was widespread in the early 1980s, but has lost some of its appeal due to new technologies and the high cost of owning and maintaining redundant equipment.
The impulse jet collector is a dry media collector that uses bags or cartridges to collect dust and debris from the air stream. The main difference between a pulse jet manifold and a reversible air manifold is that debris can accumulate on the outer surface of the bag or cartridge of the pulse jet manifold.
In addition, the Pulse Jet manifold is equipped with a pneumatic-electric cleaning system that uses compressed air to clean the filter. Compressed air is supplied to the top of the filter at a pressure of 80–100 psi. inch for 0.1-0.3 seconds. As the primary air enters the filter, secondary air is introduced from the clean air chamber and mixed with the primary air to change the direction of the air flow in the filter element. The backflow of air creates a bubble at the top of the filter, which moves along its entire length, reorganizing the dust cake and discharging the dust into the hopper.
The use of a pulse jet manifold allows cleaning while the equipment is connected to the mains, so the system does not need backup equipment for continuous operation. Cleaning can be scheduled or upon request. In a scheduled schedule, the cleaning action is activated in a continuous cycle over time, which provides easy control and ensures that the equipment is always cleaned when it is turned on. However, timed cleaning cycles can shorten filter life and use large amounts of compressed air. When the media differential pressure exceeds the set threshold, on-demand purge is initiated. This extends filter life and reduces compressed air consumption. Cartridge pulse jet manifold
Cartridge impulse jet collectors are currently the most common type of collectors in industrial production. The popularity of cartridge pulse jet collectors is mainly due to the high filtration efficiency of their modular design, lower investment costs, smaller size and greater flexibility compared to alternative methods.
The cartridge manifold is side mounted for installation and maintenance flexibility. However, cartridges have their limitations. They are best suited for picking up dry, non-abrasive dust and handling moderate dust loads (approximately 2 g/cu ft). Cartridges are generally not used in applications with airflow temperatures above 275°F or for dust containing oils or sticky substances that can stick to cartridge wrinkles; in these applications, bag filters or wet dust collectors are generally preferred.
Pulse Jet bag filters have one of the most versatile designs and are ideal for the widest range of industrial applications. Bag filters are well-suited for high temperatures and non-standard gases and are generally more forgiving than canisters. Image courtesy of Schenck Process LLC
Back jet dry dust collectors, also known as back jet bag filters, are a hybrid of pulse jet and cyclone methods. Backflow bag filters use positive displacement blowers or high pressure fans to continuously supply air to and clean equipment during operation, eliminating the need for redundant equipment. These dust collectors provide an energy-efficient alternative to other methods of collecting large volumes of dust while providing comparable performance.
Finally, the cyclone is a dry mechanical form of dust collection that can be used both as a pre-cleaner for secondary dust collectors and as a final dust collector. When used as a pre-treatment, the purpose of a cyclone is to 1) remove contaminants from the gas stream that could adversely affect the performance or function of the secondary manifold, or 2) remove valuable contaminants from the gas stream for use in a recovery or recycle process. use. When used as a final collector, the geometry and performance of the cyclone is tailored to specific contaminants and process characteristics and can provide the same final efficiency as dry media collectors.
Preventing dust and debris from entering the air is critical to protecting the health and safety of personnel, maintaining the integrity of the manufacturing process, and extending the life of equipment. However, choosing the right dust collection method requires careful consideration of many factors, from dust and airflow characteristics to energy efficiency requirements and installation constraints. Working with a knowledgeable and experienced manufacturer of dust removal and air handling equipment can help you determine the right solution for your application.
Dale Price is president of M&P Air Components Inc. Dale Price is president of M&P Air Components Inc. (Huntington Beach, CA), serving as a New York Blower’s representative for industrial fans in Southern California. Дейл Прайс является президентом M&P Air Components Inc. Dale Price is president of M&P Air Components Inc. (Huntington Beach, CA) is New York Blower’s representative for industrial fans in Southern California. Dale Price 是M&P Air Components Inc.(加利福尼亚州亨廷顿海滩)的总裁,担任南加州工业风扇的纽约鼓风机代表。 Dale Price is the president of M&P Air Components Inc. (California, 亨亨星星电影), and the New York representative of Southern California Industrial Fan. Дейл Прайс является президентом компании M&P Air Components Inc. Dale Price is president of M&P Air Components Inc. (Huntington Beach, CA) is the representative of New York Blower Industrial Fans in Southern California. Price has 38 years of experience in the design and application of dust collectors and industrial fans.


time: Sep-21-2022