Fabric filter bags are used by different industries to capture dust particles which can be a health hazard, however, selecting the right bag that matches your specific needs can be difficult. Here is a guide for selecting the right filter bag for your system.
The first step is to determine whether the filter bags you are considering can withstand the chemical make up in the dust particles. It’s chemistry with the gas stream can be highly active/acidic, hence, you want a filter bag that will be able to resist and withstand the dust particles that are chemically active. Teflon is an example of a fabric filter that has chemical resistance properties when it comes to dry and wet heat degradation. It is also used in boilers and carbon black plants due to its low friction properties which enable it to effectively release dust cake.
The most important consideration when choosing a baghouse filter is the dust properties and particles being filtered. The nature of dust particles to be filtered may vary as some are fine particulate, abrasive of even bulky. There are also dust particles that are corrosive, hence, it is wise to choose filter bags that are constructed to support combustion and this may include; acrylic felt, epitropic felt, polyester and polypropylene.
Temperature is another important consideration when selecting the right filter bags. You need to determine the level of temperature that your bags need to withstand as the choice for a high temperature unit may be different from that where the inlet temperature is low. When you choose the wrong bag to work in high temperatures environment, it is likely to get destroyed or melt in the process. Fabrics that re great for high temperature filtration includes; felt polyamide and aramid.
Similarly, the moisture level is an important variable that will help you find the right type of fabric for your application. Polyester is used in most baghouse systems like agriculture and woodworking because it can operate in ambient conditions. Polyester absorbs energy during filtration and is resistant to various oxidizing agents, organic solvents and mineral acids.
Pick the right size of filter bag that will fit well in your unit’s dust collection system. A long filter bag may be effective in ensuring that you use few dust collectors and it will be able to cover a large filtering area. But on the other hand, when the filter bag is too short, there will be reduced efficiency, increase in number of dust filter bags and reduced filtering area.
Where you purchase your filter bags plays a major role in determining whether they are the best quality for your system. When making your purchase, ensure that the seller provides you with a variety of fabric filter bags so you can choose the most suitable for your application.