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Evaluating Heat Flux Profiles in Aluminum Reheating Furnace with Regenerative Burner

机译：用蓄热式燃烧器评估铝加热炉的热通量曲线

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Properly understanding heat flux characteristics is a crucial prerequisite to efficiently applying a regenerative burner in an aluminum reheating furnace. A series of experiments was conducted in this study in order to establish a database of the best available burners according to furnace temperature, excess air ratio, and flame combustion mode as they affect heat flux characteristics at the burner plane ( Z = 0 mm). A heat flux model was developed to estimate heat transfer in the furnace, and the heat flux proportions of the other two horizontal levels ( Z = 400 mm and Z = 750 mm) were investigated. The contour profile of heat flux indicates that total heat flux ( THF ) and radiation heat flux ( RHF ) increases with furnace temperature increment (900–1100 °C). Low excess air ratio (1.2–1.3, at furnace temperature 1100 °C) not only reduced the heat flux gradient, but also contributed to enlarge high THF areas and the maximum RHF . The flameless combustion mode displayed larger average THF and RHF uniformity than that of conventional combustion mode. Therefore, the burning effect of operating condition 1 (gas velocity, 90 m/s; excess air ratio, 1.2; flameless combustion) is better than the other conditions. A change of furnace temperature and excess air ratio had mildly effect on convection coefficient, but combustion mode was in contrast. The estimated heat flux distribution from the measured heat flux at the whole burner plane was in agreement with the fitted line of the axis of burner B. Although the intercept of the simulated equation was slightly underestimated, the error can be eliminated by improving the experimental conditions. The results presented here similarly apply to all regenerative burners. A comparison of heat flux among the three horizontal levels indicated that the RHF proportion comprised about 80% of the THF at each level, and a slightly increase (21.1 kW/m 2 ) of THF in the high level from the low levels.
机译：正确了解热通量特性是在铝制加热炉中有效应用蓄热式燃烧器的关键前提。在这项研究中进行了一系列实验，以便根据炉温，过量空气比率和火焰燃烧模式建立最佳燃烧器的数据库，因为它们会影响燃烧器平面的热通量特性（Z = 0 mm）。建立了热通量模型以估算炉内的热传递，并研究了其他两个水平高度（Z = 400 mm和Z = 750 mm）的热通量比例。热通量的轮廓图表明，总热通量（THF）和辐射热通量（RHF）随着炉温的升高（900–1100°C）而增加。低的过量空气比率（炉温1100°C下为1.2–1.3）不仅降低了热通量梯度，而且还有助于扩大高THF区域和最大RHF。无焰燃烧模式显示出比常规燃烧模式更大的平均THF和RHF均匀度。因此，工作条件1（气体速度为90 m / s;过量空气比为1.2;无焰燃烧）的燃烧效果要好于其他条件。炉温和过量空气比的变化对对流系数影响不大，而燃烧方式则相反。根据在整个燃烧器平面上测得的热通量估算出的热通量分布与燃烧器B轴的拟合线一致。尽管略微低估了模拟方程的截距，但可以通过改善实验条件来消除误差。这里介绍的结果类似地适用于所有蓄热式燃烧器。对三个水平水平之间的热通量的比较表明，RHF比例在每个水平上约占THF的80％，高水平的THF从低水平略微增加（21.1 kW / m 2）。

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