电站锅炉炉内三维温度场在线检测与分析

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。

On-line Detection and Analysis of the Three-dimensional Temperature Field in a Utility Boiler

A set of visual monitoring system for three-dimensional temperature fields was installed on a 670 t/h utility boiler. The system comprises several image detectors of furnace flame, a video-frequency slicer and an industrial control device, etc. Through the radiation image treatment of furnace flame and by adopting a regularization method an on-line monitoring was implemented for the in-furnace three-dimensional temperature field (12 layers of cross-section divided along the boiler height direction). The results of the detection indicate that due to the supplementary burning of blast-furnace gas two high-temperature combustion zones have been formed along the furnace height direction. In-furnace average temperature correlates relatively well with boiler load and main steam pressure. Through the analysis of a boiler flame-extinction incident it can be shown that the monitoring system plays an important role in combustion diagnosis.