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炉膛燃烧温度场三维可视化监测方法模拟研究 总被引:23,自引:2,他引:23
为了利用火焰图像监测装置检测到的炉膛燃烧辐射能分布图像信息重建三维燃烧温度场,作者提出了一种针孔成像条件下的快速方法计算CCD(Charge-Coupled Device,电荷耦合器件)靶面接收的辐射能。成像像素接收到的系统网格单元的辐射能的份额的计算结果和辐射能图像计算结果均体现了成像过程的方向选择性和辐射能传递规律的作用。针对炉膛燃烧三维温度场重建的严重病态问题建立了一种基于Tikhonov正则化的求解方法,对于单峰型三维温度分布重建模拟计算结果表明,即使辐射图像检测包含均方差达到0.11的误差,温度场重建误差仍能维持与测量误差基本相当的水平,温度分布可视化质量较高,各种图像检测组合方式的重建结果比较显示,炉膛四角沿高度方向每隔5m左右交叉对角布置两个辐射图像采集装置,能够获得较好的全炉膛温度场可视化结果。 相似文献
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运用代数迭代技术由火焰图像重建三维温度场 总被引:13,自引:0,他引:13
在运用图像处理的方法测量火焰温度场的研究中,从摄像机获取的二维累积图像中重建出包含每个断面温度分布的三维温度场,是关系到能否投入实际应用的关系问题,结合扇形计算机断层成像原理和火焰辐射传递方程,推导出辐射强度随投影路径衰减的控制方程。将火焰断面网格化之后,运用代数重建技术对离散方程温度和辐射衰减系数同时迭代求解。在油煤混烧的燃烧器上运用该方法进行实验研究,并结合算法的数值模拟,对其可能误差和改进方 相似文献
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在1台670t/h电站锅炉上安装了1套三维温度场可视化监测系统,该系统由炉膛火焰图像探测器、视频分割器及工控机等组成。通过对炉膛火焰辐射图像的处理,采用正则化方法实现了炉膛内三维温度场(沿锅炉高度方向划分为12层横截面)的在线监测。检测结果表明,由于该锅炉掺烧高炉煤气。在沿炉膛高度方向上形成了两个燃烧高温区;炉内平均温度与机组负荷和主汽压力的相关性较好;通过对一次锅炉灭火事件的分析,表明该系统在燃烧诊断方面具有重要作用。 相似文献
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炉膛中二维温度场与辐射参数的同时重建 总被引:5,自引:0,他引:5
辐射逆问题研究受到了广泛的关注。以炉膛为研究对象,开展了二维温度场与辐射参数同时重建的研究。用CCD接收边界辐射强度图像和辐射温度图像,提出用正则化方法从辐射温度图像中重建介质温度场,从辐射强度图像中更新辐射参数,两者交替迭代,直到收敛。模拟计算表明,在测量数据中加入标准方差为0.02,0.05的正态分布的误差后,仍可以较好地重建出介质温度场与辐射参数。图4表4参13 相似文献
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An on-line three-dimensional temperature measurement experiment was carried out in a gas-fired pilot tubular furnace. Four flame image detectors were utilized to obtain two (red and green) monochromatic radiation intensity distributions, which can be calculated by the DRESOR method based on the radiation image processing technology. Then a revised Tikhonov regularization method was developed to reconstruct three-dimensional temperature distributions from the green monochromatic radiative intensity. Meanwhile, a Newton method combined with a least-squares method was used to simultaneously reconstruct radiative properties from the red one. The two calculation procedures were performed alternately, forming an iterative algorithm to a simultaneous reconstruction of temperature and radiative properties. The reconstructed temperatures agreed well with those measured by thermocouples for different cases with different calorific values and components of gas. The largest relative error was less than 3%, which validated the effectiveness and accuracy of this reconstruction algorithm. Moreover, the nonuniform radiative properties for the flame and nonflame regions were determined to improve the accuracy of temperature measurement by a rigorous comparison test. Finally a set of reasonable fixed radiative properties for the media and walls was chosen for the on-line detection of temperature. The visualized temperatures obtained by the present method agreed reasonably with those measured by thermocouples for all cases, with the largest relative error less than 5%. The present method based on radiation image processing technology is reliable for on-line temperature measurement and shows a good accuracy for its application in the combustion industry. 相似文献
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