CAJ | 학술논문

在燃煤电厂，飞灰含碳量是直接反映锅炉燃烧效率的重要指标，控制含碳量水平和低氮燃烧之间的平衡要求实现含碳量的在线（或快速）检测。将激光诱导击穿光谱技术应用于飞灰含碳量的快速测量，针对测量中248 nm附近的C和Fe谱线干扰问题，提出了利用Fe谱线修正的方法以提取重叠峰中C谱线的积分强度，对比分析了Fe 248.33 nm ，Fe 254.60 nm和Fe 272.36 nm谱线分别作为Fe 247.98 nm的修正谱线时提取的C修正积分强度对飞灰含碳量定标曲线和未知样品重复测量精确度的影响。研究结果表明，对C和Fe谱线干扰进行强度修正可以提高含碳量定标曲线的拟合度，并且可以显著改善低含碳量样品重复测量的精确度。但同时需要注意用于修正的Fe谱线的合理选取，防止在对低含碳量样品中C谱线强度的过度修正。从定标曲线和重复测量精确度总体评价而言，Fe 254.60 nm谱线最适用于L IBS测量飞灰含碳量时的C和Fe谱线干扰的修正。
재연매전엄，비회함탄량시직접반영과로연소효솔적중요지표，공제함탄량수평화저담연소지간적평형요구실현함탄량적재선（혹쾌속）검측。장격광유도격천광보기술응용우비회함탄량적쾌속측량，침대측량중248 nm부근적C화Fe보선간우문제，제출료이용Fe보선수정적방법이제취중첩봉중C보선적적분강도，대비분석료Fe 248.33 nm ，Fe 254.60 nm화Fe 272.36 nm보선분별작위Fe 247.98 nm적수정보선시제취적C수정적분강도대비회함탄량정표곡선화미지양품중복측량정학도적영향。연구결과표명，대C화Fe보선간우진행강도수정가이제고함탄량정표곡선적의합도，병차가이현저개선저함탄량양품중복측량적정학도。단동시수요주의용우수정적Fe보선적합리선취，방지재대저함탄량양품중C보선강도적과도수정。종정표곡선화중복측량정학도총체평개이언，Fe 254.60 nm보선최괄용우L IBS측량비회함탄량시적C화Fe보선간우적수정。
In coal‐fired plants ,Unburned carbon (UC) in fly ash is the major determinant of combustion efficiency in coal‐fired boiler .The balance between unburned carbon and NO x emissions stresses the need for rapid and accurate methods for the meas‐urement of unburned carbon .Laser‐induced breakdown spectroscopy (LIBS) is employed to measure the unburned carbon con‐tent in fly ash .In this case ,it is found that the C line interference with Fe line at about 248 nm .The interference leads to C could not be quantified independently from Fe .A correction approach for extracting C integrated intensity from the overlapping peak is proposed .The Fe 248.33 nm ,Fe 254.60 nm and Fe 272.36 nm lines are used to correct the Fe 247.98 nm line which in‐terference with C 247.86 nm ,respectively .Then ,the corrected C integrated intensity is compared with the uncorrected C inte‐grated intensity for constructing calibration curves of unburned carbon ,and also for the precision and accuracy of repeat measure‐ments .The analysis results show that the regression coefficients of the calibration curves and the precision and accuracy of repeat measurements are improved by correcting C‐Fe interference ,especially for the fly ash samples with low level unburned carbon content .However ,the choice of the Fe line need to avoid a over‐correction for C line .Obviously ,Fe 254.60 nm is the best choice for the correction of the C‐Fe interference .