The filtering of waste produced in the form of dust or gas is important for two reasons. These reasons are explained below and such data is analyzed before designing the filtering system project. In the following stage, VARLIK MAKİNA analyzes the main criteria such as type, physical, and chemical properties of the dust and interprets such theoretical information with its long years of experience to determine the suitable filter size and type.
1- JET-PULSE-BAG TYPE / DUST FILTERING SYSTEMS
Such filters carry out filtering using different models (determined according to the physical and chemical properties of the dust to be filtered) of filter elements produced from artificial fibers using needle punching (needle felt) in a completely dry environment. Dust accumulating on the external surface of filter bags over time during filtration is cleaned automatically by using compressed air (Jet-Pulse technique). Filtration is carried out as follows briefly:
Dusty gas passes through the pipes by the help of a vacuum created by the fan located at the end of the system (after the filter) and enters through the top part of the bunker via an input hood. It scatters in the bunker before being introduced to the bags. Filtering is carried out from the external surface to internal surface of the bags. The dust layer accumulated on the bag surface also facilitates filtering.
Cleaned gases pass through the internal surface of the bag and the filled in clean gas cell located at the top and then pass through the clean gas output pipe being discharged to the atmosphere from the fan chimney (filtered clean air passes through the fan).
The cleaning of the dust layer that accumulates outside of the filter bags in time is carried out with compressed air. Dust falling from the bags is removed from the filter lower bunker by means of an air-lock and helical conveyor, or collected in a bucket. The compressed air effect applied to filter bags during the cleaning process is realized with short pulses. Such air pulses create two types of effects on the bag:
Vibration created by the compressed air on the bag and fall of the dust present on the bag surface.
When the compressed air scatters through the internal surface of the bag and inflates it, air trying to escape from the internal surface to the external surface pushes out the dust by opening the pores of the bag.
The application of compressed air to the filter bags in short intervals is realized by an electronic timer. Timer cleaning intervals and periods are adjustable.
Caging is used to prevent the bags from flattening as a result of the vacuum (negative air pressure) inside the filter body. Installation or replacement of the bags is carried out through the top part, the clean side, by opening the top cover of the filter.