This page contains a Flash digital edition of a book.
Agricultural Industry

Cut operating costs Energy savings in drying technology for agricultural products

All over the world grain is counted as one of our most valuable staple foodstuffs. In the light of a growing world population and climate change, safeguarding this raw material is one of the challenges of our times. In addition to the monitoring of cultivation itself, handling after the harvest is also a critical factor in relation to quality assurance and the reduction of raw material losses. To meet the growth in demand for modern and efficient logistics systems, Bühler and Schmidt-Seeger will in future be working together, having now created Bühler’s new global Grain Logistics Business Unit together.

Whether it be grain or malt, canola or legumes, Buhler and Schmidt-Seeger, with their many years of experience throughout the world, offer high-end solutions for every aspect of professional grain management. The service-proven technologies of both companies complement each other perfectly and therefore cover all the processes involved: conveying, cleaning, grading, drying, dedusting, storage, loading and unloading. The proper conservation of grain safeguards its quality and its value for the producer. In addition to cleaning and the method of storage, drying plays a key role as well. In many parts of the world, including Central Europe, crop moisture content is around 30% and above, so the costs incurred for drying are a major factor which affects a producer’s ability to compete. With energy consumption developing more and more into a critical factor, the need to examine the efficiency of the drying plants from the point of view of profitability is also growing.

Functional principle of the roof column drier The functional principle (Figure 1) of the so-called roof column drier has long been known. The first driers of this type went into operation around the year 1930.

- The roof ducts are open in downwards direction. - On the side of the hot-air hood, the hot air flows over the opened roofs (red) into the product

- The product is heated and transfers its moisture to the hot air - The air cools and absorbs moisture up to its saturation limit - The moist air escapes through the neighbouring exhaust air roofs (blue) into the exhaust air hood and is drawn off via the exhaust air fan

The driers normally available on the market have the supply air roofs and the exhaust air roofs arranged in each case vertically one above the other. This means that the drying air is always directed to the product to be dried from the same side, a situation which results in non-uniform drying of the product sub- flow. A far more uniform drying effect has been achieved by turning the modules and with them the direction of the air. One disadvantage of the conventional driers with turned modules is the non-uniform air velocity (min. 2.5m/s; max. 10 m/s). This can result in the entrainment of fine seeds (rapeseed, linseed) and small grains and therefore has a negative effect on performance.

The Eco Dry drier

Drying with absolute uniformity and maximum saturation of the exhaust air were the goals set for the engineers of Schmidt- Seeger GmbH in Beilngries, Germany (part of the Grain Logistics division of Bühler AG since autumn 2010). The Schmidt-Seeger continuous-flow drier (patent pending) is the result of ongoing

Figure 1: Functional principle of the roof design

10 Solids & Bulk Handling • May 2012

Figure 2: Roof arrangement on the "Eco Dry" from Schmidt-Seeger

Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68