Abstract
The question again arises as to how to dry certain types of agricultural grain products and seeds. Should it be indirect or direct? The reason for this is the occasional fires that occur in dryers. It is often and unprofessionally stated that the cause of the fires is the use of a direct dryer. However, the causes of fires are multiple, and it is seldom due to the type of dryer. Two factors determine the differences between direct and indirect drying, and these are the nutritional and safety aspects. The ambition of this study is to clarify all the important differences between direct and indirect grain drying and to eliminate the established misconceptions on this issue. Drying of sunflower, oilseed rape and sorghum is especially delicate.
Highlights
Definition and description Direct dryers are those dryers in which convective drying is performed with a mixture of air and combustion products (Babic and Babic, 2012)
In West Germany, the prevailing view was that grain agricultural products must be dried exclusively in indirect dryers
There are major misconceptions about the role of direct and indirect grain drying in fire formation
Summary
Definition and description Direct dryers are those dryers in which convective drying is performed with a mixture of air and combustion products (Babic and Babic, 2012). The products of combustion of fuel, used as an energy source, are present in the drying fluid (drying agent). Indirect dryers are characterized by convective drying in which the drying fluid is heated air without the presence of combustion products.
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