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一、引言在化学工程中流态床设备的应用通常针对一种特定的产品。对冻结来讲却不是这样的。流态床冻结器可用来冻结多种不同的产品,例如豌豆、紫黑浆果(直径d=5-8mm),樱桃、醋栗(直径d=13-18mm)、草莓、李子、杏、肉丸(直径d=24-45mm)。因此,它必须是个适合多种用途的设备。面对这个要求,目前冻结器的空气送风系统只是简单地按最大颗粒产品进行计算。这就意味着当冻结小颗粒产品时,冻结器高于所需的流态化数(u/umt)运行以得到需要的热传导和他其技术状况。大家都知道,流态床中颗粒
I. INTRODUCTION The use of fluidized bed equipment in chemical engineering is often directed to a specific product. This is not the case for freezing. Fluid bed freezers can be used to freeze a wide variety of products such as peas, purple and black berries (diameter d = 5-8 mm), cherries, gooseberries (diameter d = 13-18 mm), strawberries, plums, apricots, (Diameter d = 24-45 mm). Therefore, it must be a multi-purpose device. Faced with this requirement, the air-blasting system of the freezer is simply calculated by the largest particle product. This means that the freezer runs above the required fluidization number (u / umt) to get the required heat transfer and his technical condition when freezing the small particle product. We all know that fluid bed particles