厚渣层熔融还原铁浴混合特性的物理模拟

Physical Simulation of Fluid Mixing in a Smelting Reduction Iron-Bath with Thick Slag Layer

设计了应用于厚渣层冶炼的铁浴熔融还原炉模型,通过水模实验研究了反应器在不同底吹布置下多层侧枪操作参数对熔池混匀时间的影响规律.单孔底吹实验结果表明,与纯侧吹实验相比,中枪角度、深度以及下枪角度的影响变弱,下枪插入深度的影响增强.多孔底吹实验结果表明:双孔底吹的混匀时间总体上小于四孔底吹布置;当喷嘴数目相同时,非对称底吹的混匀时间小于对称底吹布置.通过比较6种底吹布置下最优参数组合所对应的混匀时间,确定反应器最佳底吹参考布置为双孔非对称底吹,相应的侧枪参数为中枪角度50°、中枪水平深度180 mm、下枪角度50°、下枪水平深度180 mm.

An iron-bath reactor with thick slag layer for smelting reduction was designed, and the influences of blowing parameters on bath mixing time were studied with a water model. The results showed that using single-nozzle bottom blowing, the influences of middle lance inclination angle and immersion depth and lower lance inclination angle are smaller and the influence of lower lance immersion depth is greater, compared with side blowing only. The mixing time with two- nozzle bottom blowing is shorter than that with four-nozzle bottom blowing. With the same number of bottom nozzles, the mixing time with asymmetric nozzle layout is shorter than that with symmetric layout. Comparing the mixing time of the six optimum blowing combinations, the asymmetrical two-nozzle bottom blowing is the best combination for the reactor, and the corresponding optimum side blowing is as follows： 50° inclination angle, 180 mm immersion depth of middle lance and 50° inclination angle, 180 mm immersion depth of lower lance.