печать ]Фильтровальная техника - основы
Atmospheric Air
The air around us is a mixture of various gases. The natural atmospheric air is composed of approximately 21% of oxygen, 78% of nitrogen and 1% of argon, carbon dioxide and hydrogen. In addition to these gases there are also small amounts of rare gasses, such as neon, helium, krypton and xenon, as well as water vapour.
Atmospheric dust
Air filters
Filters for coarse dust
Filters for coarse dust are made of organic fibres, synthetic fibres, glass fibres, and metal materials. Their function is based on the principle of separating the coarse dust using the "impact effect". The dust particles do not follow the flow of air molecules in the closeness of the filter fibres since the inertial force of the particles causes their impinging on the fibres. The filter fibres can be treated with an adhesive agent, eventually the particles are caught on the fibre surface due to their special properties. In case of slight contamination the filters for coarse dust are less effective, and besides, the contamination is by a greater deal caused by fine dust, therefore these filters are gradually replaced by other filter types.
Filters for fine dust and aerosol filters (HEPA)
Testing methods
Filter capacity
Efficiency parameters of filters determined by means of costly testing methods can be achieved only at prescribed operating values. Especially with filters for coarse dust the speed if the inlet airflow has a significant influence on the separation efficiency. The filter capacity depends on the set speed of airflow through the filtrating material. Filters for fine dust and aerosol filters maintain their efficiency level without any significant changes even at greater variations from the rated load. These physical characteristics must be taken into consideration for the technical design of the multilevel filter equipment with changeable volumes of airflow.
