Selecting the appropriate filtering wind speed plays a decisive role in the dust removal efficiency and operating cost of the single bag filter. The factors affecting the filtering wind speed are: the characteristics of the dust-containing gas, the type of dust bag, and the nature of the dust.
In general, the model of the single bag filter and the filter wind speed are mainly selected according to the data and usage requirements. The theoretical data has certain reference, but it depends on the actual requirements to choose the appropriate filtering wind speed. We can analyze the selection from the following points.
First, we must find out the viscosity of the dust. Viscosity is a property of attraction between dust or between molecules of dust and surface molecules. For single bag filter, the effect of stickiness is more pronounced because the dust removal efficiency and filtration resistance depend to a large extent on the ability to remove dust from the filter material.
Second, the bulk density or bulk specific gravity of the dust should be clarified, that is, the weight of the dust per unit volume. The unit volume includes the volume of the dust particles themselves, the volume of air adsorbed on the surface of the dust particles, the micropores of the dust particles themselves, and the gaps between the dust particles. Knowing the bulk density of the dust is important for ventilation and dust removal because it is closely related to the dust removal performance of the dust.
Third, the physical and chemical properties of the dust-containing gas, such as temperature, moisture content, chemical composition and properties, should be clarified. The determination of these parameters has a direct and indirect relationship with the dust removal additional treatment measures and the selection of the filtration wind speed. If the dusty gas contains chemical components such as chloride, the chloride is generally easy to “suck up”. If no additional measures are taken, it may lead to “paste bag”.