电站锅炉燃用准东煤后存在的严重结渣、积灰等问题跟煤中高含量的碱金属（Na，K）有关。采用化学方法对准东煤进行处理以制取一定碱金属含量范围的煤样本，采用激光诱导击穿光谱（LIBS）技术对准东煤的Na，K含量进行定标与预测。结果表明：LIBS技术对Na，K元素的测量具有较高的灵敏度、较低的检测极限和较小的预测误差均方根（RMSEP）。尽管元素含量较低时，LIBS测量数据的相对标准偏差（RSD）较大，但当元素含量达到一定值后，其RSD趋于稳定，通过大量的重复测量可以保证测量的正确性。由于LIBS技术本身有快速同位测量的优点，因此LIBS可以作为在线测量煤中碱金属含量的一种手段。

Serious slagging and ash deposition issues occur in combustion of Zhundong coal in industrial power plants due to its high content of alkali (Na, K). In this study, Zhundong coal was treated by chemical methods to make a lot of coal samples with a large range of Na and K concentrations. The results of Inductively Coupled Plasma Spectroscopy (ICP) were used as known variables for the calibration and prediction of Na and K content using Laser-induced Breakdown Spectrum (LIBS).The results showed the measurements of Na and K by LIBS had high sensitivity, low detection limit and low Root-Mean-Square Prediction Error (RMSEP). The lower element concentration the sample contained, the greater the RSD was. When the element concentration reached a certain value, the RSD of measurement became stable. A large number of repeated measurements can guarantee the accuracy of LIBS measurement. Because LIBS technology itself has the advantage of fast measurement，LIBS could be a valid method to achieve online measurement of alkali content in coal.