Encyclopedia of bag dust collectors

Mondo Technology Updated on 2024-01-29

Bag Dust Collector.

When considering the advantages and disadvantages of a baghouse, it is important to understand what a baghouse system is, what exactly is removed from the baghouse, and how the system works. Applications for baghouses range from small workplaces to large industrial facilities. The system is versatile and can be used in almost any dust-generating application, but is more effective at collecting contaminants in relatively dry environments.

What is a bag filter?

A baghouse is a large-scale industrial and dust collection filtration system designed to collect, capture, and separate harmful particles, dust, and gases from the air in processing, production, and manufacturing plants. At a basic level, the system acts as an air pollution control device. Dust collectors are designed to remove and treat dirty air that is harmful to human health and the environment, and to clean the air with emissions.

The body structure of the bag filter is mainly composed of the upper box, the middle box, the lower box (ash hopper), the ash cleaning system and the ash discharge mechanism.

What can a bag filter remove?

The baghouse is considered to be a highly efficient system with an efficiency of up to 999%。Baghouses can remove and be able to withstand or capture abrasive particles, acid gases, and filter dust, fumes, and fine powders. They can collect hard-to-capture air pollutants as well as toxic substances and particulate residues from dust and welding fumes.

Due to their high efficiency, baghouses are well received and widely used in many different industrial sectors – food processing and agricultural plants, asphalt and cement plants, coal processing plants, quarries, steel foundries, chemical and paint manufacturing plants, power, power generation and energy plants, etc.

There are several common advantages and disadvantages of baghouse design.

The design of the baghouse does make a difference. The three main common baghouse designs are the vibrating baghouse, the back-blowing baghouse, and the pulsed baghouse. The main difference between the designs is the way the ash is cleaned.

The rapping bag filter is a mechanical dust collection system. As the name suggests, the rapping system works by shaking the dust cake that has accumulated in the filter bag. These bags are suspended from the top of the unit and attached to a tube sheet at the bottom of the bag filter chamber. Dirty air enters, dust removal bags collect dust and particles, and clean air is expelled from the top.

Its main advantages are low initial investment costs, basic design and simple operation. Since these units are usually divided into sections, it is not necessary to shut down the entire system when cleaning. Despite this, these units take up space, are less suitable for high-temperature contaminants, and are more energy and time intensive than other cleaning methods. The ash cleaning effect is average, and the dust removal efficiency will also be reduced.

The design of the back-blowing bag dust collector allows the airflow to flow in the opposite direction of the filter bag through a reverse blower rotating on the filter bag module. In a reverse air system, dust and particulate matter collect on the outside of the filter bag, resulting in a dust cake. The cleaning process requires reverse air blowing through the filter bag to remove particles and dust.

A back-flush baghouse is a cost-effective method that produces lower pressure than pulse jetting using compressed air. The gentle cleaning cycle is ideal for high-temperature collection and extends the life of the filter bags. The downside is that cleaning must be done frequently and there is no effective way to remove residual dust build-up, which requires more maintenance than other types of baghouse systems.

The Pulse Baghouse system uses a burst of compressed air to direct it through the clean side of the bag to remove dust cake from the surface of the bag. During the cleaning process, the bags are suspended from the flower board and supported by a dust removal skeleton – air pulses push the bags to expel the dust and collect it in the ash hopper below.

The obvious advantage of a pulse cleaning system is that the baghouse can be cleaned while the system lasts. It also cleans better and saves space than rapping or blowback systems, so fewer bags are needed. The main disadvantage is the use of dry compressed air, which increases energy costs. It also requires special types of fabrics to filter high-temperature contaminants. Finally, pulse cleaning cannot withstand high humidity and cannot be used in high humidity gases or where humidity is generated.

Overall, baghouses are versatile and efficient. It can capture fine micron particle dust with a removal efficiency of 999% or more. The basic design structure is simple, stable and reliable, and the investment is less than that of other air pollution control devices, and the bag filter is easy to maintain. Although there are exceptions depending on the filter media design, baghouses are best suited for operation in relatively dry environments and are not recommended for the collection of viscous dust.

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