Method for selecting materials for spray dryer manufacturing:
As we all know, the material of the spray dryer is an important element of the cost of the drying device. Reasonable material selection is an important means to control the price of the equipment. Under normal circumstances, the choice of spray dryer materials should be considered from the following aspects: 3.1 meet the needs of the materials processed.
The main task of the spray dryer is to dry a given material. Due to the wide variety of materials processed by the dryer, it covers many fields such as grain, food, pharmaceutical, chemical, forest products, paper, metallurgy, etc., and the products are difficult to count. The materials to be dried require a wide range of materials. For example, chemical reagents, pharmaceuticals, electronic materials, electrical ceramic materials, etc. must not be mixed with iron ions. Therefore, carbon steel materials should be avoided in equipment selection. In addition, if the moisture content in the material contains acid, alkali, salt, organic solvent, etc., it will be corrosive to different metal materials. Especially in the heating process, the corrosion of the material will be intensified, so the appropriate material should be selected according to the characteristics of the moisture contained in the material. 3.2 Selection of materials for dryer type.
As mentioned above, there are many types of dryers, each of which works differently, so it should be fully considered when selecting materials. For example, when the airflow dryer is used to dry magnesium oxide, the material is very high in the gas flow tube, the magnesium oxide material is hard, and the drying pipe is severely worn at the turning wall. Therefore, it is necessary to design an anti-wear structure or select a wear-resistant material in this area. . For another example, compared with carbon steel, the thermal conductivity of stainless steel materials is significantly lower than the former. Therefore, in the spray dryer mainly based on conduction heat transfer, if stainless steel is selected as the main material, the heat exchange area of the equipment should be calculated by the thermal conductivity of stainless steel. The engineering example proves that the stainless steel material is 30% larger than the carbon steel material when selecting the steam heat exchanger.