冶金渣颗粒余热回收的实验研究

Experimental Study on Waste Heat Recovery for Metallurgical Slag Particles

针对空气回收高温冶金渣粒余热存在的诸多问题，提出了采用自流床余热锅炉直接回收高温颗粒余热，用以生产蒸汽的技术路线．搭建了自流床余热锅炉换热实验平台，研究了换热管内水的雷诺数月P、渣粒流速和渣粒初始温度对余热锅炉换热特性的影响规律．通过实验发现：渣粒侧的换热热阻值为水侧换热热阻值的55—100倍，综合换热热阻的大小取决于渣粒侧换热热阻的大小，换热管内水的雷诺数Re对综合换热系数和热回收效率几乎没有影响；随着渣粒流速和渣粒初始温度的提高，渣粒换热系数和热回收效率均逐渐增加．

In order to solve variuous problems in recovering waste heat from high temperature metallurgical slag particles by cold air, the technique that the waste heat of metallurgical slag particles is directly recovered by gravity bed waste heat boiler to produce steam was proposed. The experiment apparatus for gravity bed waste heat boiler was established. The influences of Reynolds number of water in heat exchange tubes, slag particle velocity and the initial temperature of slag particles on heat exchange were investigated. The results show that the heat exchange resistance of slag particles is about 55 - 100 times as much as that of water in tubes. The total heat exchange resistance is determined by heat exchange resistance of slag particles, and the Reynolds number of water in heat exchange tubes has little influence on total heat exchange coefficient and waste heat recovery rate. The heat exchange coefficient of slag and the waste heat recovery rate increase gradually with the increases in velocity and initial temperature of slag particles.