球团竖炉结构参数影响炉内气体流动的数值模拟

运用气固填料床动力学理论建立了球团竖炉料层内气体流动的数学模型,确立了数学模型的边界条件.运用手编程模拟研究炉内气体流动的基本规律,进而探讨竖炉结构参数对炉内气体流动的影响.结果表明:结构参数中,导风墙宽度、焙烧带宽度以及预热焙烧带高度是影响炉内气体流动的主要因素.导风墙宽度和预热焙烧带高度的增加,以及焙烧带宽度的减小会导致冷却风上行趋势减小,焙烧风下行趋势增大.同时,导风墙宽度、预热焙烧带高度以及焙烧带宽度的改变也会导致竖炉内焙烧风与冷却风之比发生改变,即流入风量比发生改变,而流入风量比是决定炉内气体流动的最主要因素.

Numerical Simulation on Gas Flow Affected by Constructional Parameters of Pelletizing Shaft Furnaces

According to the gas solid packed bed dynamic theory, the mathematical model of the gas flow in the pellet shaft furnace (PSF) layer was established, and the boundary conditions of the mathematical model were determined. The basic law of the gas flow in PSF was studied by using the manual programming simulation, further more the influences of the structural parameters of PSF on the gas flow were discussed. The results showed that in the structural parameters, the width of the internal vertical air channels and roasting zone, the height of preheating roasting zone were the major factors that influenced the gas flow in PSF. With the increase of the width of internal vertical air channels or the height of preheating roasting zone and the decrease of the width of roasting zone, the upward cooling gas flow tended to decrease, while the downward roasting gas tended to increase. At the same time, the change of the width of internal vertical air channels or the roasting zone and the height of preheating roasting zone, also led to the change of the ratio of the roasting gas and the cooling gas, namely the change of the ratio of air volume, which was the main factor to decide the gas flow in PSF.