CAJ | 학술논문

在煤和生物质燃烧过程中，燃料中的碱金属元素会发生气态释放，并在随烟气降温的过程中凝结，产生热力设备结渣、腐蚀、积灰等问题，影响设备的安全运行。激光诱导击穿光谱（L IBS ）技术是测量煤／生物质火焰中碱金属元素分布的有效手段。建立了一套火焰场内K元素的LIBS测量系统，分别测量了不同ICCD门宽时间条件下火焰场内K元素的火焰发射光谱（FES ）信号和LIBS信号，并计算、比较了二者的信号强度随测量系统ICCD门宽时间变化的规律。实验结果表明，相同ICCD门宽时间条件下，火焰场内K元素LIBS信号强度显著高于FES信号强度。随着ICCD门宽时间的增加，二者的信号强度均逐步增加，但是二者的增速变化规律并不相同：K元素LIBS信号强度的增加速度呈现出先快后慢的变化规律；K元素FES信号强度则呈现出线性增加的规律。同时，相同ICCD门宽时间条件下，K元素LIBS信号强度与 FES信号强度的比值在ICCD门宽时间为0～8μs的范围内迅速升高至约4；之后，随着ICCD门宽时间的增加，该比值缓慢下降并逐步趋近于1。通过分析火焰场内 K 元素 FES 对 LIBS 测量影响的原理，提出了合理选取LIBS测量系统ICCD门宽时间，使得K元素LIBS信号强度与FES信号强度的比值最大化，从而降低K元素FES对LIBS测量影响，优化了提高火焰场内K元素LIBS信号测量准确度的方法。
재매화생물질연소과정중，연료중적감금속원소회발생기태석방，병재수연기강온적과정중응결，산생열력설비결사、부식、적회등문제，영향설비적안전운행。격광유도격천광보（L IBS ）기술시측량매／생물질화염중감금속원소분포적유효수단。건립료일투화염장내K원소적LIBS측량계통，분별측량료불동ICCD문관시간조건하화염장내K원소적화염발사광보（FES ）신호화LIBS신호，병계산、비교료이자적신호강도수측량계통ICCD문관시간변화적규률。실험결과표명，상동ICCD문관시간조건하，화염장내K원소LIBS신호강도현저고우FES신호강도。수착ICCD문관시간적증가，이자적신호강도균축보증가，단시이자적증속변화규률병불상동：K원소LIBS신호강도적증가속도정현출선쾌후만적변화규률；K원소FES신호강도칙정현출선성증가적규률。동시，상동ICCD문관시간조건하，K원소LIBS신호강도여 FES신호강도적비치재ICCD문관시간위0～8μs적범위내신속승고지약4；지후，수착ICCD문관시간적증가，해비치완만하강병축보추근우1。통과분석화염장내 K 원소 FES 대 LIBS 측량영향적원리，제출료합리선취LIBS측량계통ICCD문관시간，사득K원소LIBS신호강도여FES신호강도적비치최대화，종이강저K원소FES대LIBS측량영향，우화료제고화염장내K원소LIBS신호측량준학도적방법。
During the combustion of coal or biomass ,the inherent alkali metals in the fuel will be released to the gas phase .The released alkali species condensed during the cooling of the flue gas ,which may subsequently cause problems with ash deposition and corrosion in thermal fuel conversion systems .Laser Induced Breakdown Spectroscopy (LIBS) is an effective technique to measure the alkali species in the plume of burning coal or biomass .In this study ,an LIBS experimental system with a flat flame burner was set up ,and the Flame Emission Spectroscopy (FES) and LIBS of K in the flat flame environment were measured using different ICCD gate‐width times .The experimental results revealed that with the same ICCD gate‐width time ,the LIBS in‐tensity of K was higher than the FES intensity of K in the flat flame .With the increase of the ICCD gate‐width time ,both inten‐sities increased ,but their increase rates were different :the increase rate of the LIBS intensity of K was firstly fast then became slow ,but the increase rate of the FES intensity of K was constant .Furthermore ,the intensity ratio of LIBS to FES of K in‐creased monotonically with the ICCD gate‐width time in the range of 0~8μs ,until reaching approximately 4 .Then ,further in‐creasing the ICCD gate‐width time ,such ratio decreased slowly with an asymptote value of 1 .After analyzing the influences of the FES on the LIBS measurement of K in a flame condition ,it is proposed that to minimize such influence ,the optimization of the ICCD gate‐width time was necessary ,which maximized the intensity ratio of LIBS to FES of K and facilitated the measure‐ment accuracy of K in the flame environment using LIBS .