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THE DEVELOPMENT AND VALIDATION OF A SYSTEM MODEL FOR A COUNTERCURRENT CASCADING ROTARY DRYER

 

作者: W.F. CAO,   T.A.G. LANGRISH,  

 

期刊: Drying Technology  (Taylor Available online 2000)
卷期: Volume 18, issue 1-2  

页码: 99-115

 

ISSN:0737-3937

 

年代: 2000

 

DOI:10.1080/07373930008917695

 

出版商: Taylor & Francis Group

 

关键词: rotary dryer;system model

 

数据来源: Taylor

 

摘要:

An overall system model for a countercurrent rotary dryer has been developed with the ullimale aim of assessing controller pairings in these dryers. This model is based on heat and mass balances within dryer regions combined with two subsidiary models, one describing the equipment (which determines particle transport and heat transfer)and the other describing the behaviour of the material (the drying kinetics). Six partial differential equations have been set up to evaluate six state variables: solids moisture content, solids temperature, gas humidity, gas temperature, solids holdup and gas holdup as functions of time and rotary dryer length. A control-volume method has been used to reduce the six partial differential equations with respect to time and the length of the rotary dryer to six ordinary differential equations in time.

 

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