WATER HOLDING CAPACITY AND HEAT TRANSFER ASPECTS OF A MIXTURE OF SUGAR CANE BAGASSE AND WHEAT BRAN IN A PARTIALLY FILLED ROTATING DRUM

Abstract Maximum water holding capacity of a mixture of sugarcane bagasse and wheat bran was determined in static conditions and in a drum rotated at 1 rpm. The variables filling degree, water flow rate, volume of added water and number of sprinklers were tested to control the moisture content of the solid and the number of rotations to achieve homogeneous moisture content. None of the selected variables was significant, giving the apparatus high flexibility to control moisture content. For the heat transfer experiments, the tested variables were introduction of air through an inner tube amidst the particles, water sprinkling over the bed and drum rotation. The selected variables represented limited mechanisms of heat removal, although efficient when coupled with the drum rotation. The results are of value to control the temperature and the moisture content in solid-state cultivation bioreactors.

摘要：本研究测定了甘蔗渣（sugarcane bagasse）与麦麸（wheat bran）混合物在静态条件及转速为1转每分钟（rpm）的转鼓中的最大持水量。为调控固体物料的含水率并实现含水率均匀分布，实验考察了装填度、水流速率、加水量及喷头数量等变量，并通过调整转数达成均匀含水率的目标。所有选定变量均未表现出显著影响，表明该装置具备较高的含水率调控灵活性。在传热实验中，测试变量包括通过颗粒间内管通入空气、床层洒水以及转鼓转动。尽管与转鼓转动耦合时换热效率优异，但所选变量仅涵盖了有限的除热机制。本研究结果可为固态培养生物反应器的温度与含水率调控提供参考依据。