Abstract: From the mid-1970s onwards the emphasis of cement industry has been on the development of various precalcining processes. The key of precalcining process is precalciner. E. Kolyfetis developed a mathematical model which treats the spouting precalciner as a typical entrained flow reactor to describe the steady -state behaviour of SLC precalciners. In the present work, the decomposition of CaCO3 particles in the spouting precalciner was investigated by numerical modelling. The k-ε gas turbulence model as well as the no-"slip" model of particle motion was applied to the decomposition of CaCO3 in isothermal two-phase flow. The numerical results were found to be in qualitative agreement with E. Kolyfetiss results. This method was also used to study the effect of various physico-chemical and operating parameters on precalciner performance.

摘要： <正>以悬浮预热和窑外分解技术为核心的新型干法水泥生产技术是70年代以来发展起来的新工艺,目前世界各国水泥工业都在重点发展和普遍应用.窑外分解技术的关键是分解炉.图1是F.J.mith公司开发的喷腾式分解炉,E.KolyfetiS等人用准一维无滑移模型数值研究了燃烧及碳酸钙分解过程.根据实际问题,本文运用反应流的基本方程及SIMPLE方法初步研究了稳定轴对称型分解炉中碳酸钙颗粒在恒温气流中分解的两相流,计算区域如图2所示.颗粒运动采用无滑移模型,这主要是因为炉内的CaCO_3.粉体的平均粒径很小,颗粒的速度及温度在几毫秒中就能与气体达到平衡.本文将这种方法用于研究窑外分解炉.至于炉内的煤粉燃烧过程,由于更为复杂,将会待于进一步研究.