Simulation Study of Temperature Distribution in the Thermal Drying Oven for a Lacquer Coating Process

摘要

Metal sheets have to be coated with food grade lacquer and dried at thermal drying oven for metal can making process. At the thermal drying oven, exhaust gas is delivered out by the blower to eliminate the solvent. This leads to the temperature decreasing at the drying zone of the thermal drying oven, especially to unloading. To handle this, an inverter has been implemented to provide saving of electricity bill. In this work, temperature distribution and flow pattern of gas mixture between air and solvent have been studied. A three-dimensional model of the transient heat transfer has been developed and validated against the real data. Comparison of the temperature distribution and flow pattern between the conventional system or full speed and the new system with the inverter by changing speed of outflow has been made. Simulation results show that the system with the inverter obtains low temperature of the exhaust gas released out to the incinerator leading to heat loss decreasing of 10.4%. It is applicable to energy saving for the thermal drying oven.