The material of the spray dryer is an important factor in the manufacturing cost of the drying device, and choosing the right material is an important means to control the price of the equipment. In general, the choice of spray dryer material should be considered from the following aspects:
Meet the needs of processing materials
The main task of the spray dryer is to dry the given material. Due to the wide variety of materials processed by the dryer, involving grain, food, medicine, chemical industry, forest products, papermaking, metallurgy and many other fields, the products are difficult to count. The material to be dried requires a wide variety of materials. Such as chemical reagents, medicines, electronic materials, electric 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 in the material contains acid, alkali, salt, organic solvent, etc., it will corrode different metal materials. Especially during the heating process, the corrosion will intensify, so the appropriate material should be selected according to the characteristics of the moisture contained in the material.
Selection of dryer type material
As mentioned above, there are many types of dryers, and each works differently, so this should be considered when choosing a material. For example, when the airflow dryer is used to dry magnesia, the content of the material in the airflow tube is very high, the magnesia material is relatively hard, and the turning wall of the drying tube is severely worn. Therefore, it is necessary to design an anti-wear structure or choose a wear-resistant material in this area. For another example, compared with carbon steel, the thermal conductivity of stainless steel material is significantly lower than the former. Therefore, in a spray dryer that mainly conducts heat and heat transfer, if stainless steel is selected as the main material, the heat exchange area of the equipment should be calculated according to the thermal conductivity of stainless steel. Engineering examples have proved that stainless steel materials are 30% larger than carbon steel materials when selecting steam heat exchangers.
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