School of Enerrgy and Power Engineering, Nanjing University of Science and Technology;School of Enerrgy and Power Engineering, Northeast Dianli University;Dongfang Boiler Co., Ltd.;School of Enerrgy and Power Engineering, Xi'an Jiaotong University;
[Objective] Under the requirement of carbon peaking and carbon neutrality target, the proportion ofnew energy power generation in China is increasing, which puts higher requirements on the deep peaking oftraditional thermal power units. The biggest challenge to deep peaking is the unstable combustion in the furnace,and the flame temperature is an important parameter to reflect the stability of combustion. [Methods] A blackbodyfurnace was used to calibrate four charge-coupled image detectors to establish a quantitative relationshipbetween image gray value and radiation intensity. The detectors were built-in with dual band-pass filters andneutral density attenuators to obtain unsaturated monochromatic radiation images. Four detectors are arranged at symmetrical positions in the furnace chamber of a 5 MW pulverized coal boiler,and the inverse Monte Carlo method is used to solve the radiative transfer equation,combined with the Tikhonov regularization optimization algorithm to suppress the noise interference and realize the three-dimensional temperature field reconstruction,and the tests are conducted for the 15%,35%,50%,75%and 100%load conditions.[Results]The test results show that the average temperatures in the middle section are 1 182.3℃,1 235.5℃,1 239.7℃,1 272.2℃,1295.2℃,which show a significant upward trend with the increase of the load;the temperature distribution of the hearth in the height direction of the furnace under the 15%load is close to symmetrical.But the area of the high temperature region in the upper part of the hearth is larger than that of the lower part of the hearth,which reflects the actual combustion state.The three-dimensional temperature field reconstruction system can display the temperature distribution of different sections in real time,and the software interface integrates the flame image,temperature curve and two-dimensional/three-dimensional field visualization functions.The calibration experiment verifies the accuracy of the radiation intensity measurement,and the backcalculation error of the blackbody furnace temperature is less than 1%.The law of high-temperature zone area expansion and temperature increase under different loads shows that the system can effectively capture the combustion state changes.[Conclusion]The method has good potential for engineering application and is of great significance in promoting clean and efficient operation of thermal power units.
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Basic Information:
DOI：10.19944/j.eptep.1674-8069.2025.02.009
China Classification Code:TM621.2;TP391.41
Citation Information:
[1]闫伟杰,刘海东,周旭等.基于火焰辐射图像处理的炉膛三维温度场监测研究[J].电力科技与环保,2025,41(02):263-269.DOI:10.19944/j.eptep.1674-8069.2025.02.009.
Fund Information:
国家重点研发计划项目（2022YFB4100500）; 国家自然科学基金项目（52176144)