HDT气流烘丝机工艺气体载水量自动控制系统的设计与应用

为解决HDT气流烘丝机因工艺气体载水量不稳定而影响出口烟丝含水率和填充值等问题，设计一种工艺气体载水量自动控制系统。通过分析烟丝填充值与载水量的关系，确定最佳载水量设定值；根据工艺气体中氧气含量等参数计算载水量，并通过系统调节排潮风门使实际载水量处于设定值±2%范围内。以广州卷烟厂生产“双喜（莲香）”牌卷烟所使用的膨胀梗丝为对象进行测试，结果表明：采用自动控制系统后，工艺气体载水量和温度的SD值分别下降51.37%和27.66%，出口梗丝含水率和填充值的SD值分别下降13.33%和36.96%，梗丝填充值由6.69 cm3/g提升至6.83cm3/g。该技术可为提高干燥后烟（梗）丝质量提供支持。

Design and application of automatic control system for controlling water content of processing gas in HDT pneumatic tobacco dryer

In order to reduce the variation of the water content of processing gas and thereby to reduce its influences on the moisture content and filling value of output tobacco from HDT pneumatic tobacco dryer, an automatic control system was designed. The optimal water content of the processing gas was determined via analyzing its relationship with the filling value of the tobacco to be dried. The water content was calculated according to the oxygen content and other parameters of the processing gas, and the actual water content was controlled within a range of set value±2% through adjusting the opening of an exhaust valve. The system was tested on the expanded cut stems for cigarette brand "Shuangxi (Lianxiang)" in Guangzhou Cigarette Factory. The results showed that the standard deviations of water content and temperature of the processing gas decreased by 51.37% and 27.66%, those of moisture content and filling value of output cut stems reduced by 13.33% and 36.96%, respectively; the filling value of cut stems increased from 6.69 to 6.83 cm3/g. This technology provides a support for promoting the quality of dried cut tobacco and cut stems.