Four factors affecting the drying effect of boiling dryer and equipment characteristics

The boiling Dryer operates under closed negative pressure and is controlled by a PLC control system. The temperature can be automatically adjusted and the working temperature is always maintained between 50 and 120 °C. With the advantages of good material boiling condition, uniform heat absorption, fast drying speed, and good drying quality of materials, the boiling dryer is a new model that has been successfully developed by absorbing and digesting foreign technology and combining with national conditions. The structure is reasonable, the performance is stable, the operation is convenient, and the whole machine has no dead ends and no exposed screws.

The boiling dryer is composed of a host, an air handling system, a heating system, and a control system. When working, the material is added to the hopper of the dryer, the program and parameters are set according to the process requirements, and the whole machine starts to work. The air is filtered by the air treatment system, heated by the heating system, and then enters the main machine. The material is fluidized by the hot air, the water evaporates quickly, and the material is quickly dried. After the operation is completed according to the set procedures and parameters, the silo is pushed out and the lifting conveyor is buckled to lift the material to effectively control dust and cross-contamination. The equipment works under closed negative pressure, and the inner surface of the entire equipment is smooth and clean, without dead ends, easy to clean, and in line with "GMP" requirements.

The boiling dryer can directly dry liquid materials, and has various functions such as rapid drying of granules and powder materials. The material hopper is conical, which can increase the flow rate of the material and facilitate fluidization. It is not easy for the material to form a dead angle in the hopper. The material hopper is equipped with a sampling device, which can be sampled at any time to test the drying end point of the material to ensure product quality.

The boiling dryer has a cold air post-treatment process, and the dried materials can be cut by cold air in time. It can prevent the material from deteriorating due to excessive waste heat, and ensure the drying quality of the material. Special materials are used for air thermal filtration to prevent foreign matter in the radiator and impurities in the air from entering the material, ensuring the material is clean and pure. The boiling dryer is designed with a special gas distribution plate, so that the heat-carrying airflow enters in a spiral shape horizontally, so that the boiling material flow contacts the heat-carrying airflow, absorbs heat evenly, and dries the material quickly. Reduces steam consumption and saves energy.

Generally speaking, there are four factors that affect the drying effect, namely drying temperature, dew point, time and airflow.

The so-called dew point is the removal of moist air from a boiling dryer to a low residual moisture content. Then, the relative humidity is reduced by heating the air. At this time, the drying air pressure will decrease. By heating, the moisture inside can be released from the binding force with the surrounding particles by air diffusion. Dew point readings can help users find some problems, so to increase the dew point of dry air, you can monitor the dew point value.

The drying temperature of the boiling dryer is also an important factor. Heat is the key to breaking up moisture and moisture between polymers. Above a certain temperature, water molecules and polymer chains greatly reduce gravity, and water vapor is blown away by dry air. Therefore, the drying temperature also has an important influence on the final drying effect.

Drying time cannot be ignored. The relevant supplier shall specify the time required for the material to dry at the appropriate temperature and dew point. It takes some time in the air around the particles due to the absorption of heat and the diffusion of water molecules to the surface of the particles, and the drying time will affect the effect of the material to some extent.

While the material is drying, the hot air transfers heat to the particles in the drying chamber, removing moisture from the surface of the particles and returning the moisture to the dryer. This time, there must be enough air to heat the resin to drying temperature and hold it for a while.