High-moisture-content waste residue can only be transported, stored, and utilized properly after drying. However, since it often appears as wet discharge, it poses certain difficulties to the drying process, mainly in the following four aspects:

1. Difficulties in Conveying and Feeding:

Due to the high moisture content of the waste residue, the material is in a “slurry” or “toothpaste” consistency, making it difficult to feed into the dryer. This poses challenges to the feeding and metering of the material during the conveying process and easily leads to material blockage within the dryer, reducing its production efficiency.

2. Low Evaporation Rate and High Heat Consumption:

Nearly 30-40% of the material’s moisture content needs to evaporate and generate water vapor within the dryer to ensure that the material gradually evaporates to the required 3% moisture content during the drying process. This drying process requires overcoming three drawbacks: low evaporation rate, rapid temperature drop, and excessively high humidity in the surrounding environment. Therefore, the dryer must maintain a constant supply of high-temperature drying flue gas to ensure a high moisture evaporation capacity, directly increasing the equipment’s heat consumption.

3. Dust Collection Equipment Clogging and Difficulty in Dust Collection

During the operation of the dryer, the material contains 30%–40% moisture, which needs to be evaporated into water vapor inside the dryer before being discharged through the dust collector and fan. Therefore, the dust collector must follow the principle of “collecting water first, then collecting dust,” which places higher demands on the form of the dust collector and related materials. For lightweight materials, over 90% of the dried product needs to be generated by the dust collector, thus requiring higher standards in the design of the dryer’s dust collection equipment and process parameters.

4. High requirements for the heating temperature and system air velocity of the dryer

Because the material needs to be supplied with continuously high-temperature flue gas from the heating system to achieve the effect of evaporation and drying, and in order to ensure that the dried material can be discharged smoothly, it is necessary to increase the hot air temperature and system air velocity of the equipment.