钒钛磁铁矿焙烧竖炉操作参数对传热过程的影响

摘要 以年产量2×104 t钒钛磁铁矿焙烧竖炉为研究对象，建立竖炉内三维稳态传热数理模型.通过UDF(user defined functions)将反应热以内热源形式编译到固相能量方程中，定义球团矿下移速度，以竖炉内的焙烧时间和温度为判断指标，研究操作参数对竖炉内传热过程的影响.结果表明:焙烧风流量、冷却风流量以及球团下移速度为3个主要影响因素，其中球团下移速度对传热过程的影响更明显.在球团直径为38mm，焙烧时间为4～6h，焙烧温度为1100～1200K的条件下，竖炉适宜的操作参数为:冷却风流量1210～1430m3/h;焙烧风流量3070～3670m3/h;球团下移速度0.258～0.290m/h.
Abstract：With a shaft furnace of 2×104 tons annual capacity for vanadium titano-magnetite roasting as the research object， a three-dimensional steady-state heat transfer mathematical model of shaft furnace was established. The reaction heat was complied into solid phase energy equation in the form of internal heat source by UDF and the pellet velocity was defined. The roasting time and temperature were used as the evaluation indexes in order to study the effects of operation parameters on heat transfer performance. The results show that the roasting and cooling air volume rates and the pellets velocity are three main factors and the influence of the last one is the largest. Under the conditions of 38mm pellet diameter， 4~6h roasting time and 1100~1200K roasting temperature， the suitable operating parameters are obtained as: the cooling air volume rate is 1210~1430m3/h; the roasting air volume rate is 3070~3670m3/h; and the moving down velocity of pellets is 0.258~0.290m/h.