Filtration is a physical or chemical process performed to separate solid particles from a stream (liquid or gas). In physical separation, the amount of separation depends on the size of the particles and the size of the cavities.
Filtration efficiency is the most important factor in filter efficiency, which is closely related to the fineness of the fibers in the filter.
Industries such as cement, power plants, steel industries, etc. are one of the major producers of air pollution.
Due to the high efficiency of Bag House filters in air purification of production complexes with very high dust and pollution such as cement, flour, steel and power plants, these filters play an important role in purifying the climate caused by manufacturing plants. .
In conventional filters for particles less than 5 microns, the efficiency is very low and practically these filters can not filter particles less than 5 microns.
While 90% of pollutants have a diameter of less than 5 microns.
Nanofiber layers have properties such as high specific surface area, high porosity, very fine pores, low weight and thickness and high air permeability. One of the applications of these layers is their use in filtration and filter making.
Filters made of nanofiber materials have high efficiency and high air permeability.
Due to the poor mechanical properties of microfilaments prepared by electrospun nanofibers, these layers are placed on a suitable background for filtration.
The Beghaus filters mentioned in this technology consist of two layers:
The bottom layer of the fabric is made of fiberglass fibers that have high heat resistance up to 260 degrees Celsius under conditions of continuous use.
The second layer of the bag house filter consists of a Teflon coating that can be applied to the substrate consisting of glass fibers by the spray method in the electrospinning process.
Textile glass filters coated with Teflon fibers have a long life against chemicals.
The operating temperature of these filters is high and they have high efficiency in cases where high temperature filtration is required
Filtration efficiency is increased for smaller particles using Nanofibers.
Conventional filters have a large pressure drop (cost increase) as the duty cycle increases
In coated filters with suitable thickness of nanofibers, the pressure drop is less and remains constant after several working cycles (due to the presence of the head on the surface of nanofibers and nanoparticles(
Glass / Teflon structures for use in Bag House filters are currently all imported.
Alternative internal filters have a very short life at high temperatures due to the use of polyester fibers. Also, their efficiency is very low for particles less than 5 microns.