垃圾焚烧会产生大量的二次污染,使得原本极为推崇的垃圾焚烧发电倍受质疑.本文利用CFD技术对垃圾焚烧产生的烟气通过烟囱高空扩散的规律进行数值模拟,研究在多尺度空间条件下流场和污染物分布.采用标准k-ε湍流模型及组分输运模型,分析不同排烟高度和速度对排烟地点下风向1.4 km小区建筑群内污染物分布的影响.研究表明SO2、二恶英等烟气污染物在小区建筑间的浓度分布随着排烟高度和速度的增加而减弱,但由于气流分布产生涡旋的影响使得建筑物背风面污染物浓度较高.本文将计算结果与正态分布假设下的高斯烟羽模型计算结果进行比较,两者有较好的一致性.
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