CAJ | 학술논문

以理论和试验相结合的方法,对锅炉热态时水冷壁附近的温度场及声线分布进行了研究,开发了基于声学测温的水冷壁局部超温监测系统,并在国内某300MW锅炉机组上进行了试验研究.结果表明：声学测温技术应用于水冷壁局部超温监测是完全可行的;锅炉热态时,水冷壁附近的声线会朝着炉膛内高温侧发生弯曲;系统测得的烟气温度作为基准量能很好地反映水冷壁向火侧壁面温度的变化情况;线性扫频信号可以作为监测系统的声源信号,扫频区间在500～3 000Hz为宜;此系统中,互相关时延估计法能准确地计算出声波飞渡时间.
이이론화시험상결합적방법,대과로열태시수랭벽부근적온도장급성선분포진행료연구,개발료기우성학측온적수랭벽국부초온감측계통,병재국내모300MW과로궤조상진행료시험연구.결과표명：성학측온기술응용우수랭벽국부초온감측시완전가행적;과로열태시,수랭벽부근적성선회조착로당내고온측발생만곡;계통측득적연기온도작위기준량능흔호지반영수랭벽향화측벽면온도적변화정황;선성소빈신호가이작위감측계통적성원신호,소빈구간재500～3 000Hz위의;차계통중,호상관시연고계법능준학지계산출성파비도시간.
The temperature field and acoustic ray distribution near water wall of a boiler were studied at hot state theoretically and experimentally, after which a local overheating monitoring system was developed based on acoustic pyrometry and subsequently tested in a domestic 300 MW boiler unit. Results show that it is completely feasible for acoustic pyrometry to be applied for local overheating monitoring of water walls; the acoustic ray near water wall bends toward high-temperature side in the furnace at hot-state; as a reference standard, the flue gas temperature measured by the system can accurately react the temperature variation of water wall on the side facing the fire; linear sweep signal can be taken as the sound source in a- coustic pyrometry, and the best frequency range is found to be within 500--3 000 Hz; via cross correlation time delay estimation （TDE） method adopted in the system, the flight time of acoustic wave can be calcu- lated accurately.