The Furnace Exit Gas Temperature (FEGT) is a key parameter of the combustion process in utility boilers that needs to be accurately monitored, especially in order to increase their load- and fuel-flexibility. However, neither the average FEGT nor its spatial distribution over the boiler cross section can be measured using standard equipment. Advanced pyrometry provides an accurate and efficient way to monitor the FEGT: by combining the signals from several pyrometers installed around the boiler, the FEGT 2D field can be reconstructed. In this paper, we show the results of a measurement campaign carried out on a 1500 MW_th boiler using a system comprising 9 infrared pyrometers. Thanks to online adjustments of the combustion air distribution, the FEGT peak initially observed has been reduced by approximately ${100}^o$C, and the flame has been recentered.

炉膛出口气体温度（FEGT）是多用途锅炉燃烧过程中的关键参数，需要对其进行精确监控，尤其是为了提高其负荷和燃料灵活性。但是，使用标准设备无法测量平均FEGT或其在锅炉横截面上的空间分布。先进的高温测定法提供了一种监测FEGT的准确而有效的方法：通过结合锅炉周围安装的多个高温计的信号，可以重建FEGT 2D场。在本文中，我们显示了使用包括9个红外高温计的系统在1500 MW _th锅炉上进行的测量活动的结果。由于在线调整了燃烧空气的分布，初步观察到的FEGT峰值降低了大约${100}^{Ø}$C，火焰已经重新排列。