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Influence of Wind on Seepage of Gases through the Shell of Smoke Stacks

机译：风对烟气通过烟囱壳渗流的影响

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The effect of wind on the distribution of static pressure at the outer surface of thermal power station smoke stacks is considered. It is shown that the wind velocity and direction are the main factors influencing on the seepage of gases through the shell of smoke stacks when no excess static pressure is exerted from the side of flue gases. A procedure for determining the wind influence zone on the seepage processes in smoke stacks is proposed. This procedure supplements the previously adopted approach for estimating the operating modes of smoke stacks taking the influence of wind into account. The proposed procedure is used for determining if seepage of flue gases is possible and for finding the wind influence lower boundary for different operating conditions. The described procedure can be used in designing new smoke stacks and in repairing and retrofitting existing ones, and also in developing new techniques for revealing through flaws in smoke stack shells during their examination by means of an infrared imager. As an example, the results from infrared flaw detection of a smoke stack are presented, which testify that a change occur in the direction of seepage processes taking place in a reinforced-concrete shell when a change occurs in the wind effect pattern.
机译：考虑了风对火力发电厂烟囱外表面静压力分布的影响。结果表明，当没有从烟气侧施加过大的静压力时，风速和风向是影响烟气通过烟囱壳渗流的主要因素。提出了确定烟囱渗流过程中风影响区的程序。该程序补充了先前采用的方法，该方法在考虑风的影响的情况下估算烟囱的运行模式。所提出的程序用于确定烟气是否可能渗漏，以及用于查找不同操作条件下的风影响下边界。所描述的过程可用于设计新的烟囱，修理和翻新现有的烟囱，还可以用于开发新技术，以便在通过红外成像仪检查烟囱烟壳期间发现缺陷。作为示例，提出了来自烟囱的红外缺陷检测的结果，该结果证明当风效应模式发生变化时，在钢筋混凝土壳体中发生的渗流过程方向发生了变化。

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