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首先通过实验研究发现污泥干燥过程中的临界湿度约为200%,平衡含湿量约为35%。同时在实验基础上建立污泥纯太阳能干燥的数值模拟模型,模拟中将污泥视为干污泥骨架结构和水组成的混合物,采用VOF模型追踪网格中液体的界面,计算得到的冬季有日照时污泥干燥速率约为0.12kg/(m2·h),与实验测量得到的干燥速率有相同的数量级。最后讨论风速和气温对污泥干燥过程的影响,得到风速增加1.0m/s时,干燥速率增加2.2%~13.4%;温度每上升1℃,干燥速率上升138.5%~287.2%。
First of all, it is found through experiment that the critical humidity in sludge drying process is about 200% and the equilibrium moisture content is about 35%. At the same time, a numerical simulation model of sludge pure solar drying was established on the basis of experiments. The sludge was considered as a mixture of dry sludge skeleton structure and water composition. The VOF model was used to track the interface of liquid in the grid. The calculated winter Sludge drying rate is about 0.12kg / (m2 · h) during sunshine, which is the same order of magnitude as the experimentally measured drying rate. Finally, the influence of wind speed and air temperature on sludge drying process was discussed. When the wind speed increased by 1.0m / s, the drying rate increased by 2.2% ~ 13.4%. When the temperature increased by 1 ℃, the drying rate increased by 138.5% ~ 287.2%.