大同烟煤增压富氧燃烧的热重实验研究  

Thermogravimetric Research on Pressurized Oxy-fuel Combustion of Datong Bituminous Coal

作　　者：雷鸣[1] 王春波[1] 阎维平[1] 王松岭[1] 

机构地区：[1]教育部电站设备状态监测与控制重点实验室(华北电力大学),河北省保定市071003

出　　处：《中国电机工程学报》2012年第5期21-26,共6页Proceedings of the CSEE

基　　金：国家863高技术基金项目(2009AA05Z310);教育部新世纪优秀人材支持计划(NCET-08-0770);中央高校基本科研业务费专项资金项目(11QX76)~~

摘　　要：利用TherMax500型加压热天平研究了大同烟煤在增压富氧条件下的燃烧行为,主要考察压力对其燃烧特性的影响。实验结果表明,煤粉常压时的非均相着火,在中低压力下转变成均相着火,当压力增加到4 MPa后又逐渐向非均相着火过渡,并在6 MPa时完全转变成非均相着火。在均相燃烧时,随着压力的升高,挥发分燃烧速率逐渐加快,煤粉热解程度逐步加深。由于不同压力下着火方式的改变,煤粉的着火温度及燃尽温度并非随着压力的增加而单调变化,因而导致煤粉的综合燃烧特性指数S随着压力的增加先升高后降低。Non-isothermal thermo-gravimetry experiments,mainly inspecting on the influence of pressure to combustion characteristics,were performed using TherMax500 pressurized thermogravimetric analyzer to study the pressurized oxy-fuel combustion characteristics of Datong bituminous coal.The results generally indicate that the heterogeneous ignition at atmospheric pressure converts to homogeneous ignition at low and medium pressure,and then starts changing to heterogeneous ignition gradually at 4 MPa,and finally become heterogeneous ignition at 6 MPa.When the pulverized coal ignites homogeneously,the combustion rate of volatile increases with the rise in pressure and more volatile is generated.For the change of the ignition mechanism at different pressure,the igniting temperature and the burnout temperature don’t change linearly with pressure to a maximum value.As a result,the combustibility index S increases firstly and then reduce with the rise in pressure.

关 键 词：增压富氧燃烧 燃烧特性 热重分析 压力 着火机制 

分 类 号：TQ534[化学工程—煤化学工程]