Using the method to divide the whole yoghourt drying process into some parts, the operation parameters under maximal sublimation rate were studied in this paper.
假设浓缩酸乳冷冻干燥过程中冻结层温度Ti由冻结终点温度Tf经过每K温度上升到熔点温度To,以冻结层温度Ti时升华速率最大为目标,以纯冰在Ti时最大升华速率计算模型为基础,推导出冻结浓缩酸乳在Ti时以最大速率升华所允许的最大物料厚度δiy的计算模型及对应的升华时间tiy的计算模型;以物质能量平衡原理推导出Ti时最大速率升华所需的搁板温度Tis的计算模型。
In order to eliminate the judgment error of char reactivity arising from different carbon content of samples,a new parameter called specific maximum weight loss rate was introduced,defined as the quotient of the maximum weight loss rate in non-isothermal thermogravimetric analysis(TGA) experiment to the carbon content of corresponding sample.
定义试样在热天平非等温实验中的最大失重速率与该样品干燥无灰基含碳量的商为最大比失重速率,采用最大比失重速率对不同煤种、同一煤种的不同宏观煤岩和同一宏观煤岩不同燃尽度煤焦等试样的反应性进行了判断,同时与采用其他判据的判断结果作了对比。