排气筒几何高度与最大地面浓度的关系及其最佳高度选择

The Relationship between the Stack Height and the Maximum Ground Concentration and the Best Height Selection

摘要: 研究了排气筒几何高度与最大地面浓度下降值及其变化率的关系并找出了最佳高度。结果表明,最大地面浓度下降值随排气筒几何高度增加而增大;最大地面浓度下降值变化过程可大致分成由快至慢三个阶段,三个阶段均符合线性函数规律;城市污染源最大地面浓度下降值变化速度较农村污染源慢;在本文研究的条件下,最大地面浓度下降值变化率符合幂函数规律,城市和农村污染源分别为y=240. 76x^{-1. 073}和y=1599. 5x^{-1. 37};当排气筒几何高度介于29～31m时,下降值变化率转变成最低,为排气筒最佳几何高度范围。

Abstract: The relationship between the stack height and the maximum ground concentration was studied and the best height was found. The results showed that the decreased value of maximum ground concentration increased with the increasing of stack heights. The changing procedure of decreased value could be divided into 3 stages that were changing from fast to slow. The trend of decreased value was linear in each stage. The rate of decrease value was slower in city than in rural area. At the condition in this study,the rate of decreased value was power function of stack height,which was y = 240. 76 x^{-1. 073} in city and y = 1599. 5 x^{-1. 37} in rural area. The rate of decreased value was the slowest when the stack height ranged from 29 to 31 m,which could be selected as the best height range.