煤在增压富氧燃烧条件下NO_x排放特性实验研究  

Experimental Study on NO_x Release Characteristics During Pressurized Oxy-fuel Combustion of Pulverized Coal

作　　者：王春波[1] 雷鸣[1] 阎维平[1] 王松岭[1] 

机构地区：[1]电站设备状态监测与控制教育部重点实验室(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20期27-33,135,共7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(11QX76)~~

摘　　要：利用高压热重傅里叶红外联用的方法研究大同烟煤在增压富氧条件下燃料N的释放行为,主要考察压力对NOx排放特性的影响。实验结果表明,压力的改变对燃料N的迁移转化过程影响显著。由于含氮前驱体的生成机制不同,压力升高后,其转化率变化规律并不一致。随着压力的升高,挥发分产量的增加,燃料N向NO的转化率逐渐上升。在2 MPa以下时,由于NO浓度和氧分压的增加,燃料N向NO2的转化率逐渐升高,但在3 MPa时,随着NO2分解速率的加快和产量的减少,NO2的转化率有所下降。燃料N向NOx的转化率随着压力升高单调增加。The conversion of fuel-N during the pressurized oxy-fuel combustion was investigated by pressurized thermogravimetric analyzer（PTGA） combined with Fourier transform infrared（FTIR） spectroscopy,which mainly inspected on the influence of pressure to NOx release characteristics.The results show that changes in the pressure have a remarkable effect on the migration and transformation of fuel-N.The conversion rates of precursors are different from each other with the rise in pressure due to the different formation principles.Along with the increase of pressure and the yield of volatiles,the conversion rate of NO rises gradually.At pressures up to 2 MPa,because of the increase of NO concentration and the oxygen partial pressure,the conversion rate of NO2 rises gradually.But at 3 MPa,the conversion rate of NO2 drops somewhat with the increase of decomposition rate and the decrease of the yield of NO2.And the conversion rate of NOxrises linearly with pressure to a maximum value.

关 键 词：增压富氧燃烧 NOx 高压热重 傅里叶红外 压力 

分 类 号：TK123[动力工程及工程热物理—工程热物理]