Industrial Dust Control Solutions
Industrial Dust Control Solutions and Dust Collectors
By Mike Sondalini
This Industrial Dust Control Solutions whitepaper provides the essentials, industrial dust control solutions, and details of common industrial dust collector systems. Required procedures are provided like how to change dust collector bags in pulse jet dust collectors. You will see below, Mike even covers the dust bearing, hopper bridge, cyclone separator design, and even static electricity. 18 pages.
Mike goes into detail on dust collection equipment too like the section on pulse jet bag house dust collectors, he covers the twelve factors spanning their design and operation. In the section on combustible dust classification for hazardous areas, keep in mind it is from a dust control Australia perspective. As Mike is an Australian BEng(Hons), MBA, CPEng.
Dust continually builds up on the outside of the bags and a 'filter cake' develops. As the cake thickens the gas flow falls and less gas is filtered. To maintain the gas flow the dust cake is cleaned off the bag. The two common methods used to 'drop' the cake off the bags are to shock pulse the bag with an air blast or to shake the bag with a vibrating arm. Figure 1 shows a basic design of a pulse jet dust collector.
Industrial Dust Control Solutions & Dust Collectors PDF - Contents:
Dust control solutions and concepts.
Industrial dust is the result of material escaping from the confines of a process or a storage location. The size of the problem depends on the dust's characteristics and the means of its distribution. The best dust control solution for dust control is to not let it escape from where it ought to belong. There are simple techniques that can be used to manage dust and prevent it from becoming a major health and environmental problem once the mechanism of creation and distribution are understood.
Jet dust collectors.
A bag house for jet dust collectors is used to separate dust from a dust-contaminated gas stream. The gas is filtered through bags made of fabric. The fabric traps and filters out the dust while the cleaned gas passes through. The fabric consists of either woven or intertwined (felted) fibers. The bag fiber is selected for its ability to give a long working life within the internal environment of the dust collector. In this section on the pulse jet bag house dust collectors, we cover twelve factors spanning their design and operation.
Dust collector bag selection for bag houses.
The dust collector bags within a bag house must handle the process conditions they experience. The choice of bag materials is usually based on the cheapest fabric that will handle the conditions for a minimum of 3 to 5 years of operation. The selection of the dust collector bag materials requires a good understanding of the process temperature, moisture content, chemical reactions with the bag fiber, dust loading effects, and behavior of the dust bags in operation.
Changing out dust collector bags.
The dust bags in pulse jet dust collectors require replacement if damaged and leaking or if blinded by the product. This work procedure indicates the process and methods to use to change out and replace dust bags and cages in a dust collector.
Dust bearing - Protecting bearings from dust.
Protecting bearing from dust. Protection methods like labyrinth rings, rubber seals, felt seals, and shaft mechanical seals are described. The choice of the appropriate shaft seal and seal configurations to protect against dust ingress is critical. Numerous shaft seal designs suited to dusty conditions are reviewed.
Bridging in silos and hoppers.
Bridging is the name given to the self-created arch that develops just above the outlet of a bulk material silo or hopper as it empties. A bridge forms when wall friction holds up the ends of the arch. To overcome bridging the wall friction must be reduced or prevented from occurring.
Cyclone separator design - a low-cost particle removal.
A cyclone separator is used to separate larger, heavy particles from smaller, lighter particles. It does that by using a spinning column of gas to force the larger, heavier particles out to the walls of the cyclone. By changing the ratio of its dimensions they can be used to remove particles larger than a selected size.
Industrial static electricity basics.
Static electricity is the build-up of opposite polarity (positive and negative) electrical charges on two different substances in contact by the movement of one surface across the other. The spark that can occur from static build-up is the result of the opposite charges neutralizing themselves when the electrical field between them becomes strong enough to overcome the gap resistance. Static can occur on both conducting (such as metal pipes) and non-conducting (such as rubber) materials. Examples of industrial static electicity are moving liquids, gases carrying particulate, conveyor and vee-belts, printing equipment, on rubber and plastic items, during dry cleaning, on moving road vehicles and airplanes.
Combustible dust classification for hazardous areas.
Many explosions in the processing, manufacturing and bulk materials handling industries involve flammable gases or vapors and combustible dusts or fibers. Such chemicals are known as hazardous materials. The section provides a basic overview of the design requirements and maintenance practices according to combustible dust classification for electrical equipment in hazardous areas.
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An Excerpt From Industrial Dust Control Solutions & Dust Collectors PDF
"Dust bag selection for bag-houses"
The behavior of Dust Bags in Service:
Dust bags are cleaned either by pulsing air through the center of them or by mechanical shaking. The more severe of the two
methods is the air pulse, but it is also the most effective, cheapest, and easiest system to maintain. The process dust is not meant to get through the fibers of the bag. The bags are designed so that the dust builds up as layers on the outside. The built-up layers act as the filter medium and the bag is only the supporting structure to carry the dust layer. If the dust does get deep into the fibers the bag is destroyed as a filtering device.
Process Conditions Review:
The bag material must be selected to handle the process conditions within the bag house dust collector. Both the maximum
and the average temperatures must be measured, including how long the maximum temperature is sustained. As some fibers do
not like damp conditions the level of relative humidity within the dust collector must be known. The level and type of acid or
alkaline in the process gas need to be checked. So the amount of oxygen present in the gas stream, as highly oxidizing
environments is not liked by some fibers. The process chemicals in the gas stream need to be known to insure all aspects of
bag fiber degradation are addressed. Finally, the dust size range should be analyzed so the correct size of fiber weave or felt,
and the amount of needling can be selected.
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