石灰石的爆裂与磨耗特性研究  

A Study of the Explosive Cracking and Wear Characteristics of Limestone

作　　者：王进伟[1] 李少华[1] 杨海瑞[1] 吕俊复[1] 

机构地区：[1]清华大学热能工程系,北京100084

出　　处：《热能动力工程》2006年第4期366-369,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50406002);法国EDF基金资助项目(43000028789)

摘　　要：在小型炉下预热电加热流化床实验台上对土耳其的某石灰石的爆裂和磨耗特性进行了实验研究,煅烧温度与流化介质中CO2分压力对石灰石的爆裂有着十分重要的影响,当CO2的分压力大于石灰石分解的平衡压力时,煅烧反应将受到抑制,石灰石爆裂程度很小;当CO2的分压力小于石灰石分解的平衡压力时,煅烧反应生成的CO2的析出引起内部压力增大,爆裂加大,煅烧产物的粒径将明显小于原始石灰石的粒度,孔隙率也有较大程度的提高,这将有利于固硫反应的进行。该石灰石煅烧产物在流化床内的磨耗特性与煤灰相似,磨耗速率常数基本上符合指数衰减的时间函数。An experimental study was conducted for the explosive cracking.The wear characteristics of limestone of Turkish origin on a fluidized-bed test rig electrically preheated by a small-sized boiler.The calcination temperature and the partial pressure of CO_2 in fluidized media have a very important influence on the explosive cracking of the limestone.When the partial pressure of CO_2 is greater than the equilibrium pressure of limestone decomposition,the calcination reaction will be restrained and the limestone explosive cracking degree is very small.When the partial pressure of CO_2 is smaller than the equilibrium pressure of limestone decomposition,the precipitation of CO_2 produced in the calcination reaction will result in an increase of both the internal pressure and explosive cracking.The particle diameter of calcination products are obviously smaller than that of the original limestone.Moreover,the porosity is also increased by a relatively great degree,which will be conducive to the process of sulfur retention reaction.The calcination product of the limestone has in the fluidized bed the wear characteristics similar to those of coal ash and the wear rate constant basically conforms with the time function of an exponential attenuation.

关 键 词：石灰石 流化床 爆裂 磨耗 

分 类 号：X701.3[环境科学与工程—环境工程]