Using Heat Multiple Times
For optimal energy utilization when drying plastics, Motan GmbH, Isny, Germany, has developed the ETA process. In this process, the waste heat is used intentionally during the process as a means of pre-heating and cooling.
Energy consumption is reduced by aligning air flow rate, dry temperature, dew point and drying time with one another for each resin. This is especially effective with resins requiring high drying temperatures, e.g. PET.
During the process, the dry, cool air is fed to the drying hopper, where it is heated to the drying temperature. Once at the previously set temperature, it removes heat and moisture from the resin in the hopper. The previously unused warm discharge air passes subsequently through a heat exchanger and preheats the process air (drying air), before it is dehumidified again as return air in the dry air generator. At the same time, it is cooled to the required low temperature.
This regeneration process lowers energy consumption in the drying hopper and achieves optimal energy conversion via a heat exchanger. According to the manufacturer, drying systems using the ETA process reduce energy consumption by as much as 40%.
motan holding gmbh
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