燃煤电厂烟塔合一排烟风洞试验与数值模拟对比分析

COMPARATIVE ANALYSIS ON FLUE GAS DISCHARGED BY NATURAL DRAFT COOLING TOWER WITH FLUE GAS INJECTION IN COAL-FIRED POWER PLANTS BETWEEN PHYSICAL WIND TUNNEL AND NUMERICAL SIMULATION

近年来,燃煤电厂烟塔合一烟气排烟对近距离环境影响的不确定性,使其在国内的推广过程受到一定限制。准确判断烟塔合一排烟的环境影响,对于我国现有燃煤电厂烟气污染物的排放有着巨大的工程价值和明显的现实意义。利用国家环境保护某重点实验室中风洞试验平台,对燃煤电厂烟塔合一烟气污染物在近距离的扩散和传输行为,进行物理风洞试验以及数值模拟计算,并进行对比分析。结果表明:德国Austal2000模式的浓度预测并不精确;数值风洞也有其差异性,而物理风洞的结果在很大程度上符合现有的理论及国内工程实际。

The flue gas discharged by natural draft cooling tower with flue gas injection in coal-fired power plant has uncertainly effect on atmospheric environment. And that＇s why this smoke extraction technology cannot get promoted in China in these years. To accurately judge the environmental impact of flue gas discharge by this technology has great engineering value for flue gas pollutants emission in China＇s existing coal-fired power plants. In this paper,wind tunnel test platform in a key laboratory of national environmental protection was used to study the diffusion and transporting behavior of flue gas pollutants from coal-fired power plant on nearby atmosphere environment. With this,series of physical wind tunnel tests were done,and numerical simulation was calculated. The results were compared and analyzed,as well as results of other numerical wind-tunnel simulation. It was concluded that concentration prediction of German Austal2000 mode is not accurate enough;numerical wind tunnel had its difference; physical wind tunnel results,in a large degree,conformed to the existing theory and domestic engineering status.