煤颗粒在流化床中着火和燃烬特征研究  

A Study on Ignition and Burnout Time of Coal Particle in Fluidized Bed Combustor

作　　者：刘柏谦[1] 王秀清[1] 崔畅林[1] 

机构地区：[1]东北电力学院

出　　处：《燃烧科学与技术》1997年第4期412-416,共5页Journal of Combustion Science and Technology

摘　　要：根据煤的经典着火理论，从建立煤在流化床中燃烧的热平衡方式入手，建立煤颗粒在流化床中着火和燃烬的热力模型，并用褐煤在小型电加热流化床上进行了试验研究。研究表明对宽筛分煤和窄筛分煤，着火温度既是煤颗粒自身性质的函数也是运行条件的函数。当其他条件确定以后，着火时间和燃烬时间随流化床温度的变化而平滑变化。随着燃烧进行，灰层阻力的作用越来越显著。对流化床锅炉而言，当煤颗粒含碳量降到一定程度后，即认为燃烧结束是可以接受的。The paper presents a thermodynamics model which can calculate ignition and burnout time and/or its temperature of coal particles in a fluidized bed combustor and is tested in a bench scale fluidized bed combustor.The investigation shows that,whether narrow particle size or not,ignition temperature is a function of surrounding conditions and particles themselves.When the enviroment condition is defined,the ignition and burnout time has a smooth shift with initial bed temperature.With the development of combustion process,ash layer has a stronger and stronger effect on combustion.So,it can be accepted when the rest carbon content of coal particles tends to certain level,especial for large particles in industrial practice.

关 键 词：煤 颗粒 流化床 锅炉 着火 燃烬 燃烧 

分 类 号：TQ534[化学工程—煤化学工程] TK229.66[动力工程及工程热物理—动力机械及工程]