An experimental study of heat transfer and pollutant emission characteristics at varying distances between the burner and the heat exchanger in a compact combustion system

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• 作者：Byeonghun Yu^a ; Sung-Min Kum^b ; Chang-Eon Lee^a ; Seungro Lee^a ; ^{seungrol@inha.ac.kr}
• 关键词：Heat transfer characteristics ; NOx and CO emission characteristics ; Heat exchanger ; Parallel flow condition ; Counter flow condition
• 刊名：Energy
• 出版年：2012
• 期刊代码：11_03605442
• 类别：pw
• 出版时间：June, 2012
• 卷：42
• 期：1
• 页码：350-357
• 文件大小：700 K

摘要

The effect of the distance between the burner and the heat exchanger on the heat transfer characteristics and NO_x and CO emission characteristics in a compact combustion system was studied. The premixed burner was installed in front of a heat exchanger, and the distance between the burner and the heat exchanger was varied from 30聽mm to 50聽mm to experimentally investigate the effect of distance for the counter flow and the parallel flow conditions. Distances in the type A, type B and type C heat exchangers were 30聽mm, 40聽mm and 50聽mm, respectively. The results showed that NO_x concentration increased at the same equivalence ratio for both flow conditions as the distance between the burner and the heat exchanger increased. On the other hand, CO emission increased for both flow conditions due to the quenching effect as the distance between the burner and the heat exchanger decreased. In the experimental range, the optimal equivalence ratio of heat exchanger type A was 0.75 to minimize pollutant emission. At this condition, the NO_x and CO emissions were 32.3聽ppm and 85.6聽ppm, respectively, and the effectiveness was 0.797.