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首页> 外文会议>Progress in environmental science and technology.;vol. 3. >Factors Analysis of Environmental Effect of Natural Draft Cooling Towers in Burning Coal Plant
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Factors Analysis of Environmental Effect of Natural Draft Cooling Towers in Burning Coal Plant

机译：燃煤电厂自然通风塔的环境影响因素分析。

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Based on the atmospheric dispersion model and uplifted flue gas of natural draft cooling tower from German VDI3784 and VDI3945 guidelines, the impacts of the parameters of different source emissions and ambient humidity on the gas emission of cooling towers are compared respectively. The results show that the increase of flue gas flow rate will significantly strengthen the dispersion of pollutants in the air. When the flue gas flow rate is lower than 2m.s -1 , the value of FD will be below 0.35 in all 54 meteorological conditions. In this case the cooling tower will act as a point source diffusion. When the flue gas temperature increases from 10 to 40 , the improvement of the environmental impact on the ground is significant. But when the flue gas temperature rises t ℃ ℃ o 50 , It does not meet the S/P model conditions that the value of F ℃ D gradually decreases to less than 0.35 and the surface concentration caused by the gas emission of the cooling tower is much larger. The flue gas humidity and liquid water have a certain influence on the dispersion of pollutants, but the effect is not so significant. The increase of flue gas humidity and liquid water content are not conducive to the dispersion of pollutants and therefore will increase the surface concentration slightly. It has less impact on the surface concentration when ambient humidity varies below 80%. But when the ambient humidity varies over 80%, the increase of humidity will be conducive to the spread of pollutants effectively.
机译：根据德国VDI3784和VDI3945指南，基于自然扩散冷却塔的大气扩散模型和上升烟气，分别比较了不同排放源和环境湿度参数对冷却塔气体排放的影响。结果表明，烟道气流量的增加将显着增强污染物在空气中的扩散。当烟气流量低于2m.s -1时，在所有54个气象条件下FD值都将低于0.35。在这种情况下，冷却塔将充当点源扩散。当烟气温度从10升高到40时，对地面环境的影响得到显着改善。但是当烟气温度升高到50℃时，F℃的值逐渐降低到0.35以下，冷却塔的气体排放引起的表面浓度达到了S / P模型条件。更大。烟气的湿度和液态水对污染物的扩散有一定的影响，但效果并不明显。烟道气湿度和液态水含量的增加不利于污染物的扩散，因此会稍微增加表面浓度。当环境湿度变化低于80％时，对表面浓度的影响较小。但是，当环境湿度变化超过80％时，湿度的增加将有利于污染物的有效扩散。

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