Rebuilding of COMAS Cut Tobacco Dryer

COMAS counter current cut tobacco dryer and HAUNI cocurrent cut tobacco dryer were separately used in two manufacturing facilities of China Tobacco Zhejiang Industrial Limited Corporation.In order to unify processing technology and quality of products,the working principles and control systems of the two dryers were compared and COMAS dryer was rebuilt as following:changing hot-air direction from counter current into cocurrent;adding a frequency conversion speed regulator to hot-air fan motor to adjust air volume and reduce energy consumption;the temperatures of hot-air and cylinder wall being controlled in the same way as that in HAUNI dryer;installing negative pressure sensor at output end to balance the input and output air flow.The rebuilt COMAS dryer showed better performance.The moisture content in dried cut tobacco after cooling was stable,and its deviation was under 0.18%.In addition,the amount of over-dried cut tobacco during start and finish of drying operation was effectively controlled and steam consumption was also reduced.