Design & Application of New High Expansion Dryer for Cut Rag and Cut Stem

Abstract

All online high expansion driers now used in cigarette factories adopt high temperature process gas(superheated steam) to dry cut rag or cut stem.The driers are designed specially for cut rag or cut stem and need high capital investment and running cost.Therefore,a new high expansion drier suitable for both cut rag and cut stem(SH9611 oil/gas-fueled pipe drier) was developed,which uses high temperature process gas(superheated steam) to expand,dry and fix cut rag or cut stem rapidly and incorporates longer drying duct to reduce drying tower's height.By increasing the ratio of gas to material and the length of drying duct,the drying temperatures of cut rag and cut stem decrease to 232 ℃ and 210 ℃,respectively.Comparing with SH962 Flash Drier,the drying temperature decreases by 35 ℃,the proportion of long strands in dried cut rag increases by 3 percentage points,while the small particle content does not change.The filling power of cut rag is up to the technical standard of primary processing though it decreases slightly,and the sensory quality of expanded cut rag and cut stem is improved obviously.