When choosing drying machinery and equipment, we must consider auxiliary equipment. This is because the drying system consists of drying machinery and auxiliary equipment. Auxiliary equipment is also the key to choosing the appropriate link. Under normal circumstances, the drying system is mainly composed of ventilation equipment, heating equipment, host (drying equipment), gas-solid separation equipment, feeding equipment, etc.

　　Rising energy costs and pollution restrictions, working conditions and safe operation directly affect the design and selection of drying equipment. These design factors (especially the design of suspension dryers, such as spray, Flash and fluidized bed dryers) are fully discussed in the selection stage of the various types of drying machinery should also consider these factors. Sometimes, different materials and different occasions can dry the processing device, and these factors must be taken into account in the design stage.

　　For gas, the drying device can cause pollution due to dust removal. In some places, even steam is not allowed. The general requirement is that if the exhaust gas concentration is lower than 20 ~ 50mg/Nm3 dust, they may build a high-efficiency dust collector. It is important that it is suitable for drying coarse particles under certain conditions. On the other hand, the larger the particles, the longer the drying time. When dry powder materials are gathered in dust and gas purification commonly used cyclones, bag filters, electrostatic precipitators, and other forms, such as paste, paper and other materials are dried, only dust in convective drying materials occurs. In order to eliminate harmful gas pollution, people can absorb, adsorb or incinerate and other means.