高辐射覆层对热风炉传热过程影响的数值模拟

Numerical Simulation of High Radiation Coating on Heat Transfer Process in Regenerator of Hot Blast Stove

针对"高辐射覆层技术"在山东石横特钢集团1080m3高炉两座热风炉上的应用,使用CFD软件对蓄热室内部传热和流动过程进行了数值模拟,分析了有覆层(1号热风炉)和无覆层(3号热风炉)热风炉的热风流动和传热过程,建立了蓄热室内部辐射与对流换热过程数学模型,得到了3号和1号热风炉的燃烧期的烟气温度与格子砖表面温度差的变化规律以及送风期的热风温度与格子砖表面温度差的变化规律;并将数值计算结果与现场测试的数据进行比较,总结了其变化规律。结果表明:①在燃烧期,有覆层的热风炉烟气温度与格子砖表面温度之差低于无覆层的热风炉,格子砖吸热快,蓄热量增加。②在送风期,有、无覆层的格子砖与热风的温差基本相同。由于有覆层的蓄热量大,温度高,格子砖与热风的温差相同,说明有覆层的放热快,放热量增加。③有覆层的热风炉热风出口平均温度比无覆层的提高20℃以上,有覆层的热风炉的平均烟气出口温度比无覆层的下降10℃以上。

The technology of high radiative coating on regenerator （HM HRC） is an invention to improve heat transfer ability of beat transfer process within the hot stove. According to the case of ＂HM-HRC＂ in the hot stoves regenerator of 1 080 m3 BF of Shandong Shiheng Special Steel Company, the CFD software was used to ana lyze the hot air flow and heat transfer process in hot stoves with coating （No. 1 stove） and without coating （No. 3 stove）, the numerical simulation model was established and the calculated results of temperature difference changed with height between flue gas and checker brick during combustion period and temperature differences between checker brick and blast, as well as blast and flue gas temperature differences between No. 1 stove and No. 3 stove during blast period were obtained. The calculated results were compared with the measurement in real hot stoves. The results show that the hot blast temperature with coating is higher more than 20℃ than that of without coating and the flue gas temperature of the stove with coating is lower more than 10 ℃ than that without coating which is a better results for BF energy saving.