顶燃式球式热风炉烧炉过程温度场建模

来源期刊:中南大学学报(自然科学版)2018年第9期

论文作者:蒋朝辉 周刚 张海峰 桂卫华 阳春华 谢永芳

文章页码:2216 - 2225

关键词:热风炉;计算流体动力学;温度场分布;多孔介质

Key words:hot blast stove; computational fluid dynamics(CFD); temperature distribution; porous medium

摘    要:针对热风炉烧炉过程中蓄热体温度难以实时在线检测的难题,结合计算流体动力学以及传热学,建立顶燃式球式热风炉烧炉过程温度场分布模型。首先,在综合分析炉内的煤气燃烧反应、烟气湍流规律和蓄热体与烟气动态热量交换过程的基础上,建立热风炉的烟气流动模型和融合蓄热球自身热传导的局部非热平衡多孔介质模型;其次,根据实际现场检测的温度、流量和压力合理设定所建模型的定解条件;最后,采用有限体积法对模型进行求解,得到热风炉的温度场分布。研究结果表明:所建立的模型能够正确、有效地模拟热风炉烧炉过程的温度场分布,模型温度计算值与实测拱顶温度的平均相对误差低于1%,与实测废气温度的平均相对误差为2.6%。

Abstract: Considering that the heat storage temperature is difficult to detect online in the combustion process of hot blast stove, temperature distribution model for combustion process of dome combustion ball type hot blast stove was developed by computational fluid dynamics(CFD) and heat transfer theory. Firstly, considering gas combustion, flue gas flow and heat exchange, the flue gas flow model and the local thermal non-equilibrium porous medium model with heat conduction of regenerative balls were built. Then, the reasonable boundary conditions were set by the measured temperature, flow rate and pressure. Finally, the temperature distrubution of hot blast stove was obtained by finite volume method. The results show that the model can correctly simulate the temperature distribution of hot blast stove, the average relative error is less than 1% compared with the measured dome temperature and the average relative error is about 2.6% compared with the measured exhaust gas temperature.

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