In NPK fertilizer manufacturing process, dust remover is mainly used to collect dust to reduce dust emission and meet environmental protection requirements. In the manufacturing of NPK fertilizer, it is necessary to understand the relationship between dust removal power and filtration wind speed, dust removal function and filtration resistance. Therefore, the selection of dust remover should know the following four points:
1. The bulk density or bulk specific gravity of dust, that is, the dust content per unit volume. The unit volume includes the volume of the dust particles themselves, the micropores of the dust particles adsorbed on the surface of the dust particles, the air volume and the space between the dust particles. It is of great significance to clarify the bulk density of dust for ventilation and dust removal.
2. The chemical and physical properties of dusty gases, such as moisture content, temperature, chemical composition and properties. Different raw materials processed by NPK fertilizer granulator have different characteristics, and the dust produced also contains these chemical properties. The determination of these parameters is directly related to the additional disposal method of dust removal and the selection of filtration wind speed. If some dust containing gases are rich in chloride and other chemical components, chloride is easy to “absorb moisture”. If no additional method is adopted, the dust removal bag can be “pasted”.
3. The particle size distribution of dust. The particle size of dust is its fundamental characteristic. It is a composition composed of particles of various sizes. It is not feasible to use a uniform particle size to characterize this aggregate.
4. Stickiness of dust. Viscosity is a characteristic that attracts each other between dust or between dust and the surface molecules of an object. For the bag filter, the effect of viscosity is more outstanding, because the dust removal power and filter resistance largely depend on the ability to remove dust from the filter material.