高炉熔渣流化床余热回收的优化分析

Optimization Analysis of Waste Heat Recovery in Blast Furnace Slag Fluidized Bed

钢铁产业向来是中国经济不可或缺的产业,也是能源密集产业,在消耗大量资源的同时,也对环境造成了严重的危害。现行钢铁生产工艺中,高炉熔渣是主要副产物之一,带有大量高品位显热,流化床作为高炉熔渣余热回收的重要装置,在高炉熔渣余热回收领域占据重要的地位,本文提出一种高炉熔渣流化床的优化装置,采用计算流体力学(Computational Fluid Dynamics, CFD)研究冷态、低温、高温三种工况下颗粒粒径及流化风速对熔渣颗粒的换热效果的影响.研究结果表明:流化风速与颗粒相的流化高度之间成正相关;冷态工况时,在流化状态下,入风口风速与熔渣颗粒粒径对换热的效果影响不大;流化床换热主要集中在布风板处和入料口下部区域。

The steel industry has always been an indispensable industry in China’s economy, and it is also an energy-intensive industry. While consuming large amounts of resources, it has also caused serious harm to the environment. In the current steel production process, blast furnace slag is one of the main by-products, with a large number of high-grade sensible heat, fluidized bed as an important device for blast furnace slag waste heat recovery, occupying an important position in the field of blast furnace slag waste heat recovery, this paper An optimized device for fluidized bed of blast furnace slag is proposed. Computational Fluid Dynamics(CFD) is used to study the heat transfer between particle size and fluidized wind speed on slag particles under cold, low temperature and high temperature conditions. The effect of the effect. The results show that there is a positive correlation between the fluidized wind speed and the fluidized height of the particle phase. In the cold state, the air velocity at the inlet and the particle size of the slag have little effect on the heat transfer in the fluidized state;The heat exchange of the chemical bed is mainly concentrated in the air distribution plate and the lower part of the inlet.