燃煤电厂超低排放颗粒物浓度监测在线校准方法

为了解决现有燃煤电厂超低排放颗粒物监测仪器运行过程中因光学器件污染带来的测量结果不稳定及需要频繁维护的弊端，理论分析了光散射法测量超低排放颗粒物浓度的原理，提出了一种基于分光法的测量仪器满量程校准方法，并在粉尘风硐系统中实验，在不同粉尘浓度环境和仪器不同工作模式下对仪器测量结果进行了评价。结果表明，基于分光法的全量程校准技术，对光散射法超低排放监测仪器进行光强修正和定期校准，可显著提高测量结果的准确性。将仪器测量结果与滤膜称重结果拟合一次曲线可知，采用光强修正方法的曲线斜率为0963 39，24 h定期校准方法的曲线斜率为0922 00。

On-line calibration method for ultra-low emission particulate matter concentration monitoring in coal-fired power plants

In order to solve the disadvantages of unstable measurement results and frequent maintenance caused by the pollution of optical devices during the operation of the existing ultra-low emission particulate matter monitoring instruments in coal-fired power plants,the principle of measuring ultra-low emission particulate matter concentration by light scattering method was theoretically analyzed,and the proposed a full-scale calibration method of the measuring instrument based on spectrometry was proposed,and the experiment was carried out in the dust wind tunnel system,and the measurement results of the instrument were evaluated under different dust concentration environments and different working modes of the instrument.The results showed that the light intensity correction and regular calibration of the light scattering ultra-low emission monitoring instrument based on the full-scale calibration technology of the spectroscopic method could significantly improve the accuracy of the measurement results.Fitting a curve between the measurement results of the instrument and the filter weighing results showed that the slope of the curve using the light intensity correction method was 0963 39,and that of the 24-hour periodical calibration method was 0922 00.