Air infiltration into the combustion chambers of industrial furnaces is an unwanted phenomenon causing loss of thermal efficiency, fuel consumption increase, and the subsequent increase in operating costs. In this study, a novel design for a rotary tilting furnace door with improved construction features is proposed and tested experimentally in a laboratory-scale furnace, aimed at air infiltration rate reduction by decreasing the gap width between the static furnace door and the rotating body. Temperatures in the combustion chamber and oxygen content in the dry flue gas were measured to document changes in the combustion process with the varying gap width. Volumetric flow values of infiltrating air calculated based on measured data agree well with results of numerical simulations performed in ANSYS and with the reference calculation procedure used in relevant literature. An achievable air infiltration reduction of up to 50% translates into fuel savings of around 1.79 to 12% of total natural gas consumption of the laboratory-scale furnace. The average natural gas consumption increase of around 1.6% due to air infiltration into industrial-scale furnaces can thus likewise be halved, representing fuel savings of almost 0.3 m³ per ton of charge.

中文翻译：

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空气渗透对旋转倾斜炉燃烧过程变化的影响

空气渗透到工业炉的燃烧室中是一种不希望的现象，会导致热效率损失，燃料消耗增加以及随后的运行成本增加。在这项研究中，提出了一种具有改进的结构特征的旋转式倾斜炉门的新颖设计，并在实验室规模的炉中进行了实验测试，旨在通过减小静态炉门和旋转体之间的间隙宽度来降低空气的渗透率。测量燃烧室中的温度和干烟道气中的氧气含量，以记录燃烧过程中间隙宽度变化的变化。根据实测数据计算出的浸润空气的体积流量值与ANSYS中进行的数值模拟结果以及相关文献中使用的参考计算程序非常吻合。最多可实现50％的空气渗透减少，相当于节省了实验室规模炉的天然气总消耗量的1.79至12％的燃料。由于空气渗入工业规模炉中，因此平均天然气消耗增加了约1.6％，因此可将燃油消耗减少近0.3 m每吨收费³。