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【目的】在“双碳”目标要求下，中国新能源发电占比不断增加，对传统火电机组深度调峰提出了更高的要求。深度调峰面临的最大挑战则是炉内燃烧不稳定，而火焰温度又是反应燃烧稳定性的重要参数。【方法】采用黑体炉对4个电荷耦合图像探测器进行标定，建立图像灰度值与辐射强度的定量关系；探测器内置双带通滤光片及中性密度衰减片，以获取非饱和单色辐射图像。在5 MW煤粉锅炉炉膛的对称位置布置4个探测器，通过逆蒙特卡洛法求解辐射传输方程，结合Tikhonov正则化优化算法抑制噪声干扰，实现三维温度场重建，试验针对15%、35%、50%、75%和100%负荷工况进行测试。【结果】试验结果表明，中间断面的平均温度分别为1 182.3℃、1 235.5℃、1 239.7℃、1 272.2℃和1 295.2℃，随负荷增加呈显著上升趋势；15%负荷下炉膛高度方向温度分布接近对称，但上部高温区域面积略大于下部，反映了实际燃烧状态。三维温度场重建系统可实时显示不同断面的温度分布，软件界面集成火焰图像、温度曲线及二维/三维场可视化功能。标定实验验证了辐射强度测量的准确性，黑体炉温度反算误差小于1%。不同负荷下高温区面积扩展与温度升高的规律表明，系统能有效捕捉燃烧状态变化。【结论】该方法具备良好的工程应用潜力，对推动火电机组清洁高效运行具有重要意义。
Abstract：[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)