高炉冷却壁热态试验研究

Thermal Test of Blast Furnace Cooling Stave

设计并建造了冷却壁热态试验系统,对铸钢冷却壁和球墨铸铁冷却壁的换热效果进行了工业模拟试验。在冷却水流速为3.0m/s、温度为30℃、炉内温度为1200℃时,铸钢冷却壁和球墨铸铁冷却壁的热面温度分别为:305℃和683℃,冷热面温差分别是:148℃和308℃;进水温度为40℃,铸钢冷却壁和球墨铸铁冷却壁热面温度分别是446℃和795℃。结果表明:球墨铸铁冷却壁热面温度高于相变温度,内部温度梯度较大,换热效果较差。铸钢冷却壁热面温度远低于相变温度,内部温度梯度较小,换热效果好,有利于提高冷却壁寿命。

The thermal test system of cooling stave was designed and established to put up the industrial experiment of the heat transfer for the cast steel cooling stave and ductile iron cooling stave. When the water velocity was 3.0 m/s and the water temperature was 30 ℃ and the furnace temperature was 800 ℃, the hot side temperature of cast steel cooling stave and ductile iron cooling stave were 282 ℃ and 410 ℃ and the temperature difference of hot side and cold side were 140 ℃ and 148 ℃ respectively. When the furnace temperature was 1 200 ℃, the hot side temperature of cast steel cooling stave and ductile iron cooling stave were 305 ℃ and 683 ℃ and the temperature difference of hot side and cold side were 148 ℃ and 308 ℃respectively. When the water temperature was 40 ℃ and the furnace temperature was 1200 ℃, the hot side temperature of the cast steel cooling stave and the ductile iron cooling stave were 446 ℃ and 795 ℃ respectively. The experiment results showed that the hot side temperature of ductile iron cooling stave had reached the phase change temperature and the temperature gradient was high, the heat transfer efficiency was low, these were able to decrease the service life of it. The hot side temperature of cast steel cooling stave was far below the phase change temperature and the temperature gradient was small, the heat transfer efficiency was favorable, so the service life was prolonged.