Some fundamental aspects of spray drying
β Scribed by S. Katta; W. H. Gauvin
- Publisher
- American Institute of Chemical Engineers
- Year
- 1975
- Tongue
- English
- Weight
- 969 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0001-1541
No coin nor oath required. For personal study only.
β¦ Synopsis
Abstract
Equations are proposed to predict the threeβdimensional motion of droplets in a spray dryer, based on a knowledge of the characteristics of the atomizing device and of the gas flow patterns in the drying chamber. If the droplet size distribution produced by the atomizing device is known or can be assumed, the trajectories of the droplets can be calculated throughout the drying process and hence the evaporative capacity and thermal efficiency of the spray dryer can be predicted.
Experimental verification of this theoretical approach was obtained from a study of the drying of calcium lignosulfonate solutions of various concentrations in a 122βcm diam. Γ 183βcm high laboratory circular concurrent chamber with a conical bottom where the drying air was introduced tangentially near the top.
An experimental study of the effects of a number of operating variables on the capacity and the efficiency of the spray dryer was also carried out. These effects were interpreted in terms of the droplet trajectories obtained in each case.
π SIMILAR VOLUMES
In all chemical works, and, to n large cxtcnt, in the inn nufncture of food products, tlie reniovnl of wntcr froni various solutions and substnnccs forms :in interiiicdiatc step in most mnnnfncturiiig proccsscs. Vcry often this cnn be donc by evaporation in evaporators of va.rioits kinds, but in iii
## Abstract Glycine crystallization during spray drying has been investigated on a laboratory scale. In order to obtain different polymorphs the experiments have been performed at different hot air temperatures, concentrations, different flow of the solution and spraying air. The obtained crystals