【摘要】 对于多孔吸湿性的尿素颗粒,由于其颗粒内部存在大量的孔隙和具有挥发性,传统的热重力测湿法并不适宜定义其含湿量。该文通过构建一套实验装置并运用卡尔费歇滴定法定义了尿素堆的真实水含量。提出了结合水蒸气扩散和液膜迁移的数值模型并模拟了湿分的迁移。模拟结果和试验测试数据吻合较好。卡尔费歇滴定法是一种可行的定义颗粒堆水含量的方法。所展示的模型有望作为实际的工具预测多孔尿素堆中湿分的传输。更多还原

【Abstract】 For the hygroscopic porous urea particle,due to the existence of a lot of interstitial pores and its volatility,thermogravimetric method is inapplicable to determinate its moisture content.The objective of this paper is to construct an experimental apparatus and apply Karl Fischer Titration(KFT) method to determine the real moisture content of a urea particle pile at laboratory.A numerical model for correlating the vapor diffusion and liquid film movement is also presented to simulate moisture migration.Good agreement was demonstrated between the simulation and measured data.It was found that KFT method is a feasible way to determine moisture content of a storage particle pile.The presented model is expected to be a practical tool to predict interior moisture transport within a porous urea particle pile.更多还原