Principle

◆The low-temperature drying unit uses the Carnot cycle principle and is equipped with a combination of air supply and heat exchange systems. It is a new type of high-efficiency and energy-saving drying unit. According to the Carnot cycle principle, the compressor consumes a small amount of electric energy to drive the compression on the medium temperature gas which generates high temperature and high-pressure gas. This gas enters the condenser and releases heat, then the heat released from the condenser is sent to the drying chamber by the circulating fan to heat up the materials in the drying chamber and repeat the cycle. The temperature rises and absorbs the moisture in the material, where the surface moisture is continuously vaporized, then the evaporator is cooled and dehumidified, and the moisture in the material is discharged to dry the 

Main feature

◆Uses closed-circuit or micro-negative pressure operation, no odor overflow or overflow treatment, low energy consumption and low emissions;

◆Uses low temperature drying (generally ≤ 80℃), avoids high temperature or easily causes high temperature during corrosion drying, high safety rating;

◆The use of low-temperature drying can greatly reduce the need for energy during the drying process, thus reducing operating costs (the heat pump heating investment is large, and the operating cost is high);

◆It is suitable for the treatment of massive sludge with 50~75% feed water content and small corrosive components in the sludge;

◆Large processing capacity, single-layer or multi-layer structure design can be adopted, and the sludge moisture content ≤ 75% can be directly dried to about 10%;

◆High degree of automation, simple process structure, energy efficient and environmentally safe, wide application.

Comparison of main features

◆The low-temperature drying process uses hot water, electricity or low-temperature waste heat as a heat source for a medium-temperature belt dryer. The drying temperature is generally 50~80℃ during operation. The evaporated warm air passes through a condenser (or heat pump) and this causes drying。

◆The low-temperature belt dryer comes in two forms: closed-circuit structure and micro-negative pressure structure. The former can use heat pump condensing cycles and/or direct condensing cycles。

Technical parameters (reference)