Slide 1

Jangam, Mujumdar - Classification and Selection

Chapter 3

Classification and Selection of Dryers for Foods

S.V. Jangam and A .S. Mujumdar

Mechanical Engineering Department & M3TC National University of Singapore, Singapore

Contents

3.1. INTRODUCTION ....................................................................................................................... 61

3.2. CLASSIFICATION OF DRYERS .............................................................................................. 62

3.2.1. Direct dryers .................................................................................................................................... 64

3.2.2. Indirect dryers ................................................................................................................................ 64

3.3. SELECTION OF DRYERS......................................................................................................... 65

3.4. COMPARISON OF CONVENTIONAL DRYERS BASED ON FEED PROPERTIES ....... 69

3.5. SELECTION OF FLUIDIZED BED DRYERS ........................................................................ 69

3.5. SELECTION OF SPRAY DRYERS .......................................................................................... 74

3.6. COMPARISON OF CONVENTIONAL DRYERS WITH NEWER DRYERS .................... 76

3.6.1. Classification of superheated steam dryers ........................................................................ 77

6.3.2. Developments in fluid bed drying ........................................................................................... 78

6.3.3. Hybrid drying technologies ....................................................................................................... 78

3.7. CASE STUDIES .......................................................................................................................... 80

3.7.1. Production of milk powder ........................................................................................................ 80

3.7.2. Drying of grains .............................................................................................................................. 80

3.8. CLOSING REMARKS ................................................................................................................ 81

Jangam, S.V. and Mujumdar, A.S. Classification and Selection of Dryers for Foods, in Drying of
Foods, Vegetables and Fruits - Volume 1, Ed. Jangam, S.V., Law, C.L. and Mujumdar, A.S. , 2010,
ISBN - 978 - 981 - 08 - 6759 - 1, Published in Singapore, pp. 59 - 82.