Energy Saving on Spray Drying Process by Modifying the Hot Air Flow

Abstract

The drying machine works with the Spray Dryer method to dry particles from a liquid state through continuous spraying in the drying chamber. This Spray Dryer uses an atomizer in the form of a 0.2mm mist nozzle type injector with a spraying capacity of 0.00045 kg/s. Function for atomization during the drying process occurs with a change in the vortex angle of 35°. In this study, the liquid used was pure cow’s milk with a specific heat value of 3930 J/kg K. To increase the total amount of solids, increase the volume, speed up the drying process, and prevent material damage due to high temperatures, the milk was mixed with maltodextrin, water, and salt. In this drying process, the temperatures used are 100°C, 105°C, and 110°C. The humidity of the surrounding air can be reduced by using a dehumidifier containing a zeolite stone type molecular sieve measuring 1.7-2.5mm as an absorbent. The results of this study indicate that the moisture content of dry powdered milk products is 10.01% using a temperature of 105°C with a drying air flow speed of 16 m/sec. In addition, the drying time process was taken a time of 73 minutes which resulted in a drying rate of 0.455gram/second. This dehumidifier affects the temperature in the drying chamber to be constant between 101°C-104°C and lowers the humidity of the air by 7%, resulting in a 222gram milk soak. The efficiency value of the drying machine with a temperature of 105°C is 18.68%.