【摘要】 对兰考泡桐单板在实验室喷气干燥中以不同温度(100、150、200、250℃)和喷气速度(5、10、15和20米/秒)进行了干燥试验。求得了厚度1.2毫米单板的干燥速度和干燥速度系数经验方程。利用求得的方程对在不同温度和喷气速度条件下干燥机的生产量和干燥费用进行了预测。结果指出,随温度的增加,干燥机产量增加,干燥费用降低;干燥机产量也随风速增大而增加,但风速太高或太低都引起干燥费用增加。最佳风速可根据求得的经验方程和企业各项费用实际水平确定。本文还提出了防止单板变色的处理方法。更多还原

【Abstract】 Paulownia elongata veneers were dried in a laboratory jet dryer at different temperatures (100 to 250℃, 4 steps) and jet velocities (5 to 20 m/s, 4 steps). The empirical equations of drying rate and the drying rate coefficent for veneer of 1, 2 mm thickness were obtainded.The production capabilities of dryer and drying costs at different temperatures and jet vilocities were predicted with the equations obtainded. The results indicate that the production capability of dryer could be increased and the drying cost reduced, with higher temperature, and the production capability is also increased with higher velocity. However the drying cost would be increased if the velocity is too high or too low. The optimum jet velocity could be determined with equations obtained and the actual level of cost eonpoments at the factory. An approach for the prevention of Paulownia veneer from discoloration was proposed.更多还原