Discontinuity in grain dryer operation as a cause of higher energy consumption
2012
Babić, Mirko (Faculty of Agriculture, Novi Sad (Serbia). Department of Agricultural Engineering) | Babić, Ljiljana (Faculty of Agriculture, Novi Sad (Serbia). Department of Agricultural | Engineering) | Pavkov, Ivan (Faculty of Agriculture, Novi Sad (Serbia). Department of Agricultural Engineering) | Radojčin, Milivoj (Faculty of Agriculture, Novi Sad (Serbia). Department of Agricultural Engineering)
Soybean and maize are usually dried after harvesting. Flow dryers with a continuous process are often used for grain drying in agricultural production. The best energy efficiency in drying by means of these devices is achieved when there is no change in process parameters, and when there are no interruptions in operating. However, under normal operating conditions, certain disruptions occur which lead to discontinuity in operation. The most common disorders are: abrupt changes in moisture content, changes in types of hybrids (or varieties), plant outages caused by different factors, and changes in drying regime. This paper analyses quantitative effects of these disorders on drying energy efficiency and shows an increase in fuel consumption required for drying (∆B): ∆B = ∆B1+∆B2+∆B3+∆B4 where ∆B1 is the increase in fuel consumption as a result of changes in grain moisture content, ∆B2 is the increase in fuel consumption as a result of changes in types of hybrids, ∆B3 is the increase in fuel consumption as a result of operating interruption, and ∆B4 is the increase in fuel consumption as a result of the change in drying regime. Drying cost reduction, in the case of discontinuity, can be obtained on the basis of these results. Another result of this analysis is the proposal of a series of technological, organizational and technical activities in order to eliminate the discontinuities in drying as much as possible.
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