紊流酸洗槽的数值仿真及酸洗影响参数分析

Numerical simulation and parameter analysis of turbulent pickling tank by fluent

为了研究目前最先进的带钢酸洗方式紊流酸洗,采用RNGk-ε湍流模型模拟了紊流酸洗槽内的流场,分析了流量,槽内喷射方式、酸洗液的温度及槽内带钢运动速度对带钢表面湍流强度及努塞尔数分布的影响,并对各影响带钢表面流动和传热特性的参数做了比较分析.结果表明:入射流量及喷射角度主要影响酸槽入口区域带钢表面流态和努赛尔数分布,而其在酸槽内部的分布主要由带钢运动速度和酸液温度决定;加大带钢运动速度和入射流量、提高酸液温度、选择适当的高径比和入射角都能不同程度地提高带钢表面的紊动和传热效果.

The RNG k-ε turbulent model was used to investigate the most advanced pickling method-turbulence pickling. The internal flow field in the pickling tank was simulated. The effects of jet flow rate, angle of the jet, velocity of the steel strip movement, and acid temperature on the turbulence intensity and local Nu number on the surface of the steel strip were studied. Meanwhile, various pickling parame- ters were compared and analyzed. Results showed that the flow rate and the jet angle mainly affected the velocity contour and the heat flux in the entrance region of pickling tank. The movement of the strip and the acid temperature impacted the inner part of the tank. By increasing the strip speed and jet flow, ap- propriate height-radius ratio and jet angle the effect of the turbulence intensity and the heat transfer on the steel strip can be improved.