Convective Drying

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2008. Available from: http:// biblioteca.olade.org/opac-tmpl/ Documentos/cg00041.pdf

**38**

article/view/9265/9923

*Current Drying Processes*

**Chapter 3**

**Abstract**

industrial implementation

required quality of the product.

**1. Introduction**

**41**

Convective Drying in the

Theoretical Bases and Practical

*Artem Artyukhov, Nadiia Artyukhova, Ruslan Ostroha,*

The main advantages regarding the convective drying of the granular materials in the multistage dryers with sloping perforated shelves were represented. Peculiarities of the shelf dryers' hydrodynamics were shown in the research. Various hydrodynamic weighing modes were experimentally justified, and the relevant criteria equations were obtained. The results of investigations regarding the interphase heat and mass transfer were given; criteria dependencies, which predict heat and mass transfer coefficients in the shelf dryers, were proposed. A method to assess the efficiency of the dehydration process at the separate stages of the device and in the dryer, in general, was proposed. The algorithm to define the residence time of the granular material on the perforated shelf with a description of the author's software product for optimization calculation was shown. The shelf dryers' engineering calculation method was presented in this work. The original constructions of devices with various ways to control the residence time of the granular material that stays in their workspace were described. The testing results of the shelf dryer to dry granular materials, such as coarse- and fine-crystalline potassium chloride, sodium pyrosulfate, and iron and nickel powders, were demonstrated.

**Keywords:** convective drying, multistage shelf dryer, hydrodynamics, interphase heat and mass transfer, efficiency of dehydration, engineering calculation,

Convective drying is one of the most effective methods for disperse material dehydration in the chemical, pharmaceutical, mining, and other industrial branches [1–6]. The direct contact of the drying agent with high-temperature potential and dried material enables intensively to remove the surface and adsorption-bound moisture [3]. That is why drying is the only method for industries to achieve the

Although during drying the energy consumption is the lowest, the convective dryers are more often used to dry disperse materials thanks to other numerous

*Mykola Yukhymenko, Jozef Bocko and Jan Krmela*

Multistage Shelf Dryers:

Implementation

#### **Chapter 3**
