基于超低排放的燃煤电厂烟囱高度优化研究

Optimization of Chimney Height for Coal-Fired Power Plants for Ultra-Low Emission

燃煤电厂全面实施超低排放后,烟气污染物排放水平大幅降低,是否仍需采用高烟囱排放已引起关注。以平原区不同容量燃煤电厂为例,对超低排放水平下烟囱高度与污染物最大落地浓度关系进行研究,并对特定高度下是否出现建筑物下洗进行判定,分析烟囱高度优化的可能性。研究结果表明:平原区燃煤电厂执行超低排放限值后,300 MW、600 MW、1 000 MW级机组烟囱从现有推荐高度分别降低至130 m、140 m、150 m时,污染物最大落地浓度增幅不显著,初步判定污染物增加幅度可接受且不会出现建筑物下洗,烟囱高度存在优化降低的空间。

Since the implementation of ultra-low emission in coal-fired power plants,the emission concentration and the ground concentration of gas pollutants have been reduced significantly.As a result,widespread concerns have been raised regarding whether it is still necessary to keep using high chimneys.The article studied the relationship between the chimney height and the maximum ground pollutant concentration of coal-fired power plant under ultra-low emission standards in plain areas.Particularly,the article investigated the building downwash under certain chimney height and explored the feasibility to optimize the height of the chimney.The results showed that since the implementation of ultra-low emission,the current recommended heights of chimneys for 300 MW,600 MW and 1 000 MW generation units have decreased to 130 m,140 m and 150 m respectively,while there is no significant increase of maximum ground pollutant concentration.Therefore,it is concluded that the magnitude of pollutant increase is acceptable without building downwash.Generally,the chimney height of coal-fired power plants under ultra-low emission in plain areas can be optimized and lowered further.