高海拔地区水泥生料悬浮炉分解特性研究

Study on decomposition characteristics of cement raw meal in suspension furnace at high altitude

高海拔地区低压低氧的大气条件影响水泥生料在分解炉内的分解过程,探究水泥生料在该条件下的分解特性具有重要意义。通过构建模拟高海拔地区的低压悬浮炉实验系统,研究了压力、温度以及O_(2)浓度对高海拔条件下水泥生料分解特性的影响。研究结果表明:低压条件下水泥生料的分解符合随机成核和随后生长模型;随着反应压力的逐渐降低,水泥生料的分解速率逐渐增大,反应产物的比表面积以及比孔体积逐渐增大;但低压条件会加剧燃料的不完全燃烧,降低水泥生料的分解率;燃料以及水泥生料的反应速率均会随着反应温度的上升而逐渐增大,但水泥生料的分解率会先升高再降低;燃料的燃尽率以及反应速率随着O_(2)浓度的增加而增大,进而提高反应物的反应速率。

The atmospheric conditions of low pressure and low oxygen in high altitude areas affect the decomposition process of cement raw meal in the decomposition furnace,and it is of great significance to explore the decomposition characteristics of cement raw meal under these conditions.An experimental system was constructed to simulate a suspension furnace in high-altitude areas with low pressure,and was studied the reaction process of cement raw meal in the calciner.Also,the effects of pressure and temperature and O_(2) concentration on the decomposition characteristics of cement raw meal were studied by changing the reaction conditions.The research results show that the decomposition of cement raw meal under low-pressure conditions conforms to the random nucleation and growth model.As the reaction pressure gradually decreases,the decomposition rate of cement raw meal gradually increases,and the specific surface area and pore volume of the reaction product gradually increase.But low-pressure conditions will aggravate the incomplete combustion of fuel and reduce the decomposition ratio of cement raw meal.The reaction rate of fuel and cement raw meal will gradually increase with the rise of reaction temperature,but the decomposition ratio of cement raw meal will increase firstly and then decrease.Under low-pressure conditions,the fuel reaction ratio and reaction rate increase with the increase of O_(2) concentration,which can increase the decomposition rate of the reactant.Therefore,in high altitude areas,the decomposition rate and decomposition ratio of cement raw meal can be increased by appropriately increasing the reaction temperature or increasing the O_(2) concentration of the reaction atmosphere.