1. Meet the needs of the materials being processed
The main task of microwave drying equipment is to dry a given material. Due to the wide variety of materials processed by dryers, it covers many fields such as food, food, pharmaceutical, chemical, forest products, paper, metallurgy, etc. The products are difficult to count. The material to be dried requires a variety of materials. For example, chemical reagents, drugs, electronic materials, and electrical ceramic materials 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 acids, bases, salts, organic solvents, etc., it will corrode different metal materials. In particular, during the heating process, the corrosion of the material is exacerbated, so the appropriate material should be selected according to the characteristics of the moisture content in the material.
2. Select materials for the equipment installation environment
In many cases, although the above conditions can meet the requirements, but also pay attention to the material requirements of the equipment installation environment. If the equipment is installed in a chemical plant, the environment must be carefully considered to prevent corrosion of equipment, control systems and electrical systems.
3. Select the material for the drying process
The different drying conditions of the materials are also different. Like some high temperature drying devices, inorganic salts are dried during polymerization. Dry hot air temperature requirements are higher than 800 °C. The dry material must be made of high temperature resistant stainless steel, but considering that the drying chamber is not in the high temperature zone, according to the calculation, only the high temperature resistant material is selected in the high temperature zone. It has been running for more than a year and everything is fine.
4. Select the material of the dryer type
As mentioned above, there are many types of dryers, each of which works differently and should therefore be fully considered when selecting materials. For example, when a gas flow dryer is used to dry magnesium oxide, the material in the gas flow tube is very high, the magnesium oxide material is very hard, and the drying tube is heavily worn on the steering wall. Therefore, it is necessary to design an anti-wear structure or select a wear resistant material in this area. . For another example, the thermal conductivity of stainless steel materials is significantly lower than that of carbon steel. Therefore, in a microwave drying apparatus mainly based on conduction heat transfer, if stainless steel is selected as the main material, the heat exchange area of the apparatus should be calculated by the thermal conductivity of the 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.