声波激励对煤粉燃烧NO_x生成的影响  

Effect of Acoustic Excitation on NO_x Generation of Coal Combustion

作　　者：沈国清[1] 师云泽 王彦博[2] 蒋泓亮[1] 张世平[1] 安连锁[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206 [2]华北电力大学能源动力与机械工程学院,保定071003

出　　处：《燃烧科学与技术》2015年第6期506-510,共5页Journal of Combustion Science and Technology

基　　金：北京高等学校青年英才计划资助项目(YETP0700);华北电力大学中央高校基本科研业务费专项资金资助项目(2014MS10);煤的清洁转化与高效利用创新引智基地111计划资助项目(B12034)

摘　　要：基于声波激励影响NOx生成的原理,搭建了声场耦合滴管炉燃烧系统,分别进行了未加声场和加声场下的煤粉燃烧实验,通过烟气分析仪在线实时测量烟气中NOx在外加声场前后的含量变化,得到了不同声波频率和声压值对NOx生成的影响规律.由实验结果可知,声波有降低NOx生成的作用,实验条件下较低频率（100~400,Hz）的声波对NOx降低效率较高,200,Hz时NOx降低幅度最大为16.35%.实验的声压级范围80~120,d B内声压级越大,对NOx的降低作用越强,1,000,Hz,120d B的声场对煤粉燃烧产生NOx的消减作用可达19.3%.Based on the theories of NOx reduction by acoustic excitation, an combustion system of acoustic field cou- pling of drop tube furnace was set up to study the NOx emissions by coal combustions with acoustic field and without acoustic field, respectively. The NOx concentration was measured online by a flue gas analyzer. The results showed that NOx produced by coal combustion could be reduced by acoustic effect. Under laboratory condition, the most re- duction was under low acoustic frequency （100--400 Hz）, the maximum NOx reduction rate was 16.35% when acous- tic frequency was 200 Hz. The reduction rate increased as the SPL raised in the range of 80-120 dB, the NOx emis- sions reduced by 19.3% in an acoustic field with the sound frequency of 1 000 Hz and SPL 120 dB.

关 键 词：声波激励 煤粉燃烧 NOx 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]