固定污染源烟气在烟道中流速分布的研究

针对固定污染源烟气在烟道中流速分布对净化方法的效率和排放总量计算的影响,采用自主研制的组合式流场的流速采样枪和国标方法对某电厂矩形烟道进行了烟气在烟道中流速分布的研究。实验结果表明,组合式流场的流速采样枪在烟道同一断面上各测点进行同时、同步、多点测量,其测量数据既能反映同一断面各测点上的流速特征,又能反映断面上各点的均值。组合采样枪各测点的伸入深度与流速之间呈对数关系,相关系数为0.960 6,数据具有真实性和准确性。烟气流速在烟道分布相当不均匀,呈现高流速、中流速、低流速3个区域。烟气流速由烟道内侧向外侧逐步增大,由内侧3 m/s,增加到外侧16 m/s。烟道顶部流速要高于烟道底部流速。

Study on Velocity Distribution of Flue Gas from Stationary Sources

For the influence of velocity distribution of flue gas from stationary sources on purification efficiency and calculation of total emissions, the research has done the comparative experiment between self-developed modular sampling gun for velocity and GB method. The results showed that modular sampling gun for velocity can achieve simultaneous, synchronized and multi-point measurement on the same section of the flue. The measurement result not only could reflect features of velocity of measurement points on the same section, but it also reflects the means of measurement points. There was a logarithmic relationship between the depth of measurement point and velocity. The correlation of modular sampling gun was 0.960 6. The velocity presented uneven distribution, and divided into three areas that are high velocity area, medium velocity area and low velocity area. The velocity of flue gas gradually increased from the inside to the outside of the flue, varying from 3-16 m/s. The velocity in the top of the flue was higher than the bottom.