CAJ | 학술논문

重油火焰的低 NOx排放非常重要，另外，油气锅炉容积热负荷大，极易发生燃烧振动。文中在9 MW燃烧重油试验台上进行试验，研究了投运燃尽风、喷水和喷蒸汽对重油 NOx排放的影响，同时利用光谱仪进行火焰闪烁和火焰稳定性的研究。结果显示，投运燃尽风(over fire air，OFA)可有效降低NOx的排放浓度，不过，在开启OFA条件下，喷水法和喷蒸汽法对尾部 NOx浓度影响都很小，喷水使火焰振荡频率升高，开启OFA下喷蒸汽会使火焰振荡频率降低，火焰振荡频率越小，火焰稳定性越差。试验结果证实了火焰频谱特性测试系统的有效性。
중유화염적저 NOx배방비상중요，령외，유기과로용적열부하대，겁역발생연소진동。문중재9 MW연소중유시험태상진행시험，연구료투운연진풍、분수화분증기대중유 NOx배방적영향，동시이용광보의진행화염섬삭화화염은정성적연구。결과현시，투운연진풍(over fire air，OFA)가유효강저NOx적배방농도，불과，재개계OFA조건하，분수법화분증기법대미부 NOx농도영향도흔소，분수사화염진탕빈솔승고，개계OFA하분증기회사화염진탕빈솔강저，화염진탕빈솔월소，화염은정성월차。시험결과증실료화염빈보특성측시계통적유효성。
The low NOx emission of heavy-oil-fired flame is an important physical parameter associated with the characteristics of a combustion process. The steam boiler using heavy oil fuel or gas fuel is prone to thermoacoustic instability. Experiments were carried out on a 9 MW heavy-oil-fired combustion test facility. The impact of over fire air (OFA), water and steam on the NOx emission was studied. The flame flicker signal was obtained by fiber optic spectrometer. Results show that OFA can effectively reduce the NOx emission. However, water and steam both have little effect on the NOx emission when OFA is applied. The flame oscillation frequency is increased when water is injected, while the flame oscillation frequency is decreased when steam is injected. The flame instability becomes worse with the flame oscillation frequency decreasing. The experimental results provide a reliable basis for laboratory research and industrial application. The results also demonstrate the effectiveness of the system for monitoring the flame spectral characteristics.