热泵除湿对密集烘烤温度场和品质效果的影响

Effect of Heat Pump Dehumidification on Temperature Field and Quality Effect in the Bulk Curing Barn

为探究热泵水热分离除湿方式对密集烤房烘烤效果的影响,以粤烟97烟叶为样品,设计了热泵除湿(HP)和传统燃煤(TC)密集烤房烘烤效能试验,通过采集系统获得烤房内22个测试点温度和烤房电耗数据,分析2种方式密集烤房的温度场均匀性问题,并结合烤后烟叶经济成本、外观质量和主要化学成分等多个特征指标,明确HP方式能有效提高烟叶品质,降低烘烤能耗。结果表明,在设定相同烘烤工艺条件下,TC方式标准差为1.313℃,偏差平均值为1.855℃,而HP方式标准差为0.540℃,偏差平均值为0.754℃;结合水平和垂直方向温度场试验可知,HP方式温差波动较小,能形成稳定的温度流场,有利于提高烟叶烤后品质;在干烟质量相当情况下,HP方式总成本为TC的46.28%,单位干烟叶成本为TC的41.88%;HP方式烤后烟叶外观质量和主要化学成分协调性均优于TC烤后烟叶。

In order to explore the baking effect of water-heat separation and dehumidification methods with heat-pump in the bulk curing barn,this paper used Yueyan 97 tobacco leaves as a sample to design the baking efficiency test of bulk curing barn between heat pump(HP)and traditional coal(TC).The temperatures of 22 test points and power consumption data of the bulk curing barn were obtained through the acquisition system.The temperature field uniformity problem was analyzed with the two methods in the bulk curing barn.Combined the economic cost,appearance quality and main chemical components of the tobacco leaves after curing,the characteristic indexes showed that the HP method can effectively improve the quality of tobacco leaves and reduce the energy consumption of curing.The results showed that,under the same baking conditions,the standard deviation of TC method was 1.313℃and the mean was 1.855℃;The standard deviation of HP method was 0.540℃and the mean was 0.754℃.Combining the horizontal and vertical temperature field tests,temperature fluctuation of HP method,which can form a stable temperature flow field,was smaller than TC method,and it was beneficial to improve the quality of tobacco after baking.When the quality of dry leaves was comparable,the total cost of the HP method was 46.28%of TC,and the unit dry leaves cost was 41.88%of TC.The appearance quality and main chemical composition of tobacco leaves using the HP method were better than those using the TC method.