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在春秋季节,常发现粮食含水率并未增加,贮藏时间也没超过安全期,但在贮仓内局部却出现粮食霉烂、变质的现象,这是什么原因呢? 原来是由于谷物水分迁移所致。在夏季或初秋气温较高时,往仓内贮粮,这时粮温较高。当时至深秋、初冬,气温急剧下降,靠近仓壁处的粮食温度低于贮仓中部粮食的温度。出现温差,使仓内空气产生循环流动,如图a所示。在空气通过粮
In spring and autumn, it is often found that the moisture content of grain does not increase and the storage time does not exceed the safety period. However, in the silo, there is a phenomenon of mildew and deterioration of grain locally. What is the reason? . In the summer or early autumn when the temperature is high, the storage of grain storage, then higher food temperature. At the time of late autumn and early winter, the temperature dropped sharply. The temperature of the grain near the silo wall was lower than the temperature of the grain in the middle of the silo. Temperature difference occurs, so that the air circulation inside the warehouse, as shown in Figure a. In the air through the food