/ep_edm/en/contect_244.html SHINI PLASTICS TECHNOLOGIES, INC.

Special Reports

2010 Quarter 3 Issue 4

Energy Saving Technology for Drying Equipment

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With the development of science and technology, power consumption of machines is highlighted for special attention because it is related to production costs and product competitiveness. The newly developed SCD-ES "All-In-One" Energy Saving Compact Dryers carry out optimal configuration according to actual production conditions to save energy, reduce production costs and enhance product competitiveness.

 

Silica Gel Honeycomb Rotor Adopted

It stably provides dry air with low dew-point, and the demanded regeneration temperature is 150℃. Compared with traditional molecular sieve dehumidifiers with required regeneration temperature of 200℃, SCD-ES save about 30% of energy.

 

Heat Recovery by Heat Exchanger

The plate-type heat exchanger is located between regeneration outtake and intake air. As shown in the picture below, when ambient temperature is 10℃, heat transfer proceeds between Point A (regeneratied outtake air with high temperature)and Point B (regeneratied intake air) according to the law of the conservation of energy. Temperature at Point D increases to 44℃ after regenerated intake air passing through the heat exchanger, therefore power consumption of regeneration heater is reduced. However, Temperature at Point C reduces to 25℃ after regenerated outtake air passing through the heat exchanger to lower the ambient temperature. The lower the ambient temperature is, the more power will be saved. The plate-type heat exchanger is also placed between humid return air and dry cold air. According to the same theory, temperature of cold air increases to reduce power consumption of drying heater; temperature of humid return air decreases to reduce consumption of cooling water that used to cool down the return air. The higher the drying temperature is, the more power will be saved. The total power consumption will be reduced by 20~25% when adopting plate-type heat exchanger.

 

 

 

Dew-point Temperature Can be Set

Traditional SCD take maximum load all the time and the regeneration temperature maintains at 150℃. Actually the required dew-point temperature of dry air is -20℃when processing plastics that are easy to dry such as ABS. As for SCD-ES, the dew-point temperature can be set by which regeneration temperature of the wheel can be controlled to make the most of power. Setting range of dew-point temperature is -40~+10℃ which saves energy of 0~10%.

 

 

 

Drying Recipes Available

After setting the name of material and its hourly consumption, the system adjusts air volume by frequency converter to make most of the power. Common recipes are built in the machine, and users are allowed to create new recipes by entering plastic material name, drying temperature and time, material bulk density and the demanded dry air volume. When hourly material consumption accounts for 20~100% of the rated drying capacity, total power consumption of machine will reduce by 0~40% to achieve optimal allocation of power, and it also prevents influences on physical and mechanical properties of materials resulting from over-drying.