计算流体力学——改进硫酸装置性能的工具

Computational fluid dynamics-A tool to improve the performance of sulphuric acid plants

阐述计算流体力学(CFD)的原理,介绍CFD在硫酸装置中的3则应用案例:冷换热器冷端管板的温度分布,转化器内置热换热器旁路管内的气体分布,焚硫炉内温度及气体分布。通过用CFD彩色编码图详细地形象化表示硫酸装置内部发生的情况,得出结论:分流气体换热器可消除在冷换热器和SO3冷却器中SO3侧的酸冷凝并使SO2侧所夹带的少量酸雾气化,在大型设备中两种不同温度的气流混合不一定适宜,CFD可使硫磺燃烧过程的模拟、焚硫炉几何结构的优化成为可能。

Principle of Computational Fluid Dynamics （CFD） is explained with 3 case studies in sulphuric acid plants： temperature and flow patterns at the cold end of a cold exchanger, gas distribution in a gas bypass duct of a hot gas exchanger inside a converter and temperature and gas distribution in a sulphur furnace. By visualizing in detail what happens inside sulphuric acid plant equipment with CFD coulor-coded maps, it is concluded that split flow gas heat exchanger will eliminate condensation on the SO3 side in cold exchangers and SO3 coolers and will cause small amounts of entrained acid to vaporize on the SO2 side, mixing of two gas streams at different temperatures in large equipment cannot be taken for granted and CFD has made it possible to model the combustion process of sulphur and to optimize the geometry of furnaces.