生物干化传质传热数值模拟

Numerical simulation in heat and mass transfer model of bio-drying

基于质量、动量和能量守恒定律理论,建立好氧生物干化的数学模型,探索生物干化过程随时间和空间的变化机理。以污泥为研究对象,数值模拟污泥生物干化过程中堆体内部水分浓度与温度空间的分布形态,分析不同通风方式对水分浓度与温度的影响,模拟得到通风20 min停20 min是最佳的运行方式,同时结合实验研究,模型的水分变化值与实验值的平均绝对误差为1.04%,模型与实验值具有较高的一致性。

Based on the laws of conservation of mass,momentum,and energy,a mathematical model of biodrying was established,to explore the mechanisms of biodrying. Through numerical simulation analysis,we obtained the space distribution of moisture concentration and temperature in the biodrying sludge pile. In addition,how the moisture concentration and temperature were influenced by different ventilation conditions during the biodrying process was investigated. The simulation results showed that the optimum operational conditions included twenty minutes of ventilation with a twenty minute break from ventilation. When the simulation data was compared with the experimental data,the average absolute error rate was 1. 04%,indicating highly consistent data.