СПЕКТРОСКОПИЧЕСКАЯ СИСТЕМА МНОГОПАРАМЕТРИЧЕСКОГО КОНТРОЛЯ ПРОЦЕССОВ ГОРЕНИЯ
Authors: Ваганов М.А. 
Published: February 2025

В работе предлагается концепция построения спектроскопической системы на базе эмиссионной и лазерно-искровой эмиссионной спектрометрии, позволяющей выполнять многопараметрический контроль процессов горения на основе измерения множества заранее установленных спектроскопических информативных параметров. Приводятся результаты экспериментального исследования параметров, характеризующие процесс горения пропана. Даётся математическое описание многопараметрического контроля, позволяющее установить допускаемые значения результатов спектральных измерений, обеспечивающие заданную достоверность проводимого контроля. Приводятся результаты компьютерного моделирования допускаемых значений и вероятностей ошибок контроля и их сравнение с результатами эксперимента.
Introduction. Combustion processes are characterized by multiple informative parameters, including spectroscopic ones. Therefore, in the research, to solve the monitoring problem, there is proposed to use the methods of applied optical spectrometry, where a monitoring system built on the basis of optical spectrometers measures optical radiation carrying spectroscopic data on the monitored process and can replace most of the monitoring and measuring equipment placed on the object. The gathered spectroscopic data allows one to carry out multi-parameter monitoring, where the conclusion about the state of the monitored process is performed based on the comparison and analysis of many spectroscopic parameters - separate spectral lines and / or spectral regions, as well as their relationship. The aimof the research is to propose a concept of a spectroscopic system that allows one to perform multi-parameter monitoring of combustion processes based on emission and laser-induced breakdown spectroscopy (LIBS) with a given monitoring reliability. Findings. 1) An experimental study of the spectroscopic informative parameters characterizing the propane combustion process was carried out by the methods of emission and laser-induced breakdown spectroscopy; the most intense spectral lines and areas characterizing the combustion process of gaseous hydrocarbon fuel were identified, and their dependence on the gas / air ratio was given. By measuring the values of the intensity of these lines and taking into account their relationship, it is feasible to implement multi-parameter monitoring of the combustion process; 2) The concept of designing a spectroscopic system based on emission and laser-induced breakdown spectroscopy was proposed, which allows to carry out multi-parameter monitoring of combustion processes based on the measurement of pre-defined spectroscopic informative parameters; 3) There was derived a mathematical apparatus that allowed to establish the limit values ​​of the results of spectral measurements, which ensure the specified requirements for the probabilities of monitoring errors of the 1st and 2nd kind. 4) Computer simulation of the permissible values ​​and error probabilities for the case of monitoring 4 parameters was carried out. Numerical findings were compared with the experimental results. It was found that the emission method exhibits the probability of an error of the 1st kind of 17.1%, and of the 2nd kind of 12.3%, while the theoretical value aS= 14.9 % at bдоп = 10 %. The LIBS method showed the probability of an error of the 1st kind of 16.1%, and of the 2nd kind of 11.7%. The best performance of monitoring was found in the case of applying two methods of spectroscopy. The probability of an error of the 1st kind was 15.5%, and the 2nd kind was 10.8%. This can be explained by the fact that the most intense spectral bands or lines were chosen as the monitored parameters.