In-bin Grain Drying Systems

The main categories of in-bin dryer systems are reviewed. For Southeast Asian conditions, research on in-store dryers is discussed, as a component of a two stage drying system for maximum quality preservation and reduced drying cost. Limitations for paddy and maize exist, requiring management of the system to obtain these benefits. Examples of adoption of in-store drying in conjullction with first stage dryers are presented. IN-BIN drying is drying grain in bins commonly used for grain storage. It is divided into two main classifications: low-temperature (air heated by less than 6°C), and high-temperature drying (air heated to over 50°C). The objectives of drying are the same as for any other unit operation: to process maximum product at minimum cost whilst maintaining adequate quality. Drying is not able to improve the product quality. Its value is in arresting spoilage by controlling water activity within the product. There are further advantages in reducing the bulk required for transport and in preparing paddy for milling.