Experimental study of drying equipment and technique with different heating methods

In allusion to some problems for the traditional vegetable dryer with warm air and simple far-infrared radiation heating dryer, the technique method with combinative heating and parallel-leading flow of air was introduced to optimize the combination of far-infrared radiation and warm air, which is a new technique with combination heating. Advantages for each one have been displayed, Comparison with the experimental results at different heating methods shows that the drying rate is the highest and energy consumption is the least in the combinative dryer. It is should be chosen that air drying first and then far-infrared radiation in the period of drying for vegetables in the new system. The diameter of link-tube for leading air and for supplying air in the device reduced from upper part to lower part, i.e., the quantity of warm air for supplying each box and the quantity of leading air reduced from upper part to low part to satisfy the needs for the quantity of air of each box of dryer.