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Specifics of Smoke Stack Operation under Wind Effect Conditions

机译：风效应条件下烟囱运行的细节

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Seepage of flue gases into the environment through the chimney of thermal power plant smoke stacks often occurs during their operation, causing intensive damage to them. This phenomenon occurs due to the difference of pressure between the smoke stack inner and outer surfaces when the stack is streamlined by the flow of atmospheric air. The smoke stack operating conditions as a function of the stack load and wind conditions was studied. In particular, the excess pressure in the smoke stack shaft is estimated according to L.A. Rikhter’s criterion, and the static pressure along the stack height is calculated. The motion of combustion products in the smoke stack shaft and streamlining of the shaft by cross flow of atmospheric air are simulated in separate and combined statements using 3D models at different values of flue gas flowrate and wind velocity. It is shown from the study results that assessment of excess pressure conditions in a smoke stack according to Rikhter’s criterion is not sufficiently correct, because it does not take into account the windinduced underpressure outside of the smoke stack. Numerical investigations carried out using 3D models showed that quite extensive zones with underpressure exist at the smoke stack outer surface when the stack is streamlined by atmospheric airflow. The greatest underpressure is observed under such conditions on the smoke stack lateral surfaces with respect to the wind direction. At a certain wind velocity, the underpressure outside of the stack becomes greater than it is inside of the stack, as a result of which zones appear on the stack surface in which flue gases seep through the shaft into the environment. An analysis of the obtained data showed that the seepage intensity increases with the wind velocity. On the other hand, the area of these zones and the difference of static pressures in them decreases with decreasing the flue gas flowrate.
机译：烟气在热电厂烟囱中的运行过程中经常会通过烟囱渗入环境，从而对其造成严重破坏。这种现象的发生是由于烟囱被大气流动流线化时，烟囱内表面和外表面之间的压力差所致。研究了烟囱工作条件随烟囱负荷和风况的变化。特别是，根据L.A. Rikhter的标准估算烟囱竖井中的超压，并计算烟囱沿烟囱高度的静压。使用3D模型在烟道气流量和风速的不同值下分别和组合地模拟烟囱中燃烧产物在烟囱中的运动以及大气交叉流对烟囱的流线形。研究结果表明，根据Rikhter的标准评估烟囱中的过压状态是不够正确的，因为它没有考虑烟囱外部的风压不足。使用3D模型进行的数值研究表明，当烟囱被大气气流流线化时，烟囱外表面会存在很大的负压区域。在这样的条件下，在烟囱侧面相对于风向观察到最大的负压。在一定的风速下，烟囱外部的负压变得大于烟囱内部的负压，其结果是烟囱表面出现了一些区域，其中烟气通过竖井渗入环境。对获得的数据的分析表明，渗透强度随着风速的增加而增加。另一方面，这些区域的面积和其中的静压差随着烟气流量的减小而减小。

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