Heat transfer characteristics of a Rotary Regenerative Combustion System (rrx)
Heat transfer characteristics of a Rotary Regenerative Combustion System (rrx)
复制标题
旋转蓄热式燃烧系统 (rrx) 的传热特性
DOI：
10.1002/(sici)1520-6556(1998)27:8
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
N. Arai
中科院分区：
文献类型：
--
作者：
H. Miyama;H. Kaji;Y. Hirose;N. Arai
为了节约燃料，蓄热式燃烧器作为加热源在工业窑炉领域得到了广泛的应用。通过将燃烧器与蓄热式空气预热器相结合，开发出了第二代蓄热式燃烧器--旋转蓄热式燃烧系统(RRX)，该系统除了节省燃料外，还具有更低的空气污染物排放和紧凑性。
本文从蓄热式空气预热器的传热理论出发，从理论上推导了再生式空气预热器的换热特性，并在两台实验台上进行了实验研究。1994年夏季，对一台商业运行的烧结式加热器进行了改造，安装了三套RRXs，并成功运行了一年。
结果表明，不仅考虑对流换热，还考虑辐射换热，RRX内的换热系数可预测在±10%以内。并从理论和实验两方面证实了工业加热炉的燃油效率稳定在90%以上。也测量到大约60ppm的NOx排放(干燥时，6%O2)，尽管预热空气温度计算出高达930K。
With a view to saving fuel, the use of regenerative burners as a heating source has been spreading in the field of industrial furnaces. By combining a burner with a regenerative air preheater, a second generation regenerative burner—the Rotary Regenerative Combustion System (RRX)—has been developed, which makes for lower emission of air pollutants and compactness, in addition to fuel savings.
In this paper, heat transfer characteristics of RRX were deduced theoretically based on the heat transfer theory of a regenerative air preheater and investigated experimentally using two test rigs. A commercially operating fired heater was revamped in the summer of 1994 to install three sets of RRXs, and it has been successfully operated for one year.
As a result, it was determined that the heat transfer rate in RRX can be predicted to within ±10%, by considering not only convective but also radiative heat transfer. Furthermore, it was confirmed both theoretically and experimentally that fuel efficiency exceeding 90% was stably attained in a commercial fired heater. Around 60 ppm of NOx emission (as dry, 6% O2) was also measured, although the preheated air temperature was calculated to be as high as 930 K. © 1999 Scripta Technica, Heat Trans Jpn Res, 27(8): 584–596, 1998