Energy Efficient Research On Exhaust System In Wood Drying Equipment

Based on the theoretical analysis, this paper proposed some energy-saving measures for exhaust systems in conventional wood drying equipment. The energy consumption in wood drying kiln was improved. In order to achieve the effect of energy-saving, we should increase equipment energy efficiency; the condition is ensuring the drying quality.This study was aimed at investigating the airflow uniformity at the air-exchange device where the airflow inlet and outlet simultaneously during the lumber drying. The optimal diameters and distribution of the orifices were obtained by examining the air flux and velocity at the inlet and outlet ducts using the combination of the theoretical analysis and numerical simulation (CFD). The results indicated that the difference of air flux in the inlet orifices was less than 5.1%, while the difference of air flux in the outlet orifices was less than 7.3%. Since both of the differences were less than 10%, it was ensured that the uniform airflow distributions in the inlet and outlet orifices were achieved. In addition, the orifice radius distributions from the end to the beginning of the inlet and outlet ducts were examined. Two quadratic distribution curves of the orifice radius for the air inlet/outlet ducts were developed: y=0.0112x2+0.0876x+34.033 for the inlet duct, and y=-0.0154x2-0.4835x+45.506 for the outlet duct.This paper analyzed the energy consumption in conventional drying kiln and proposed some measures to save more energy. Conclusions can be drawn as follows, heat recovery device, the average hourly heat transfer for the 9961.54kJ, equivalent to saving electricity 2.77kw-h. According industrial electricity prices, annually 42,226.08yuan can be saved. Heat recovery device costs about 5,330yuan. These data show that the unit is not only lower costs; the most important is the waste heat, in the traditional exhaust device, will be effectively recycling.