1D TEMPERATURE TOMOGRAPHY OF A FLAME, BASED ON VIS-NIR SPECTROMETRY

Abstract

This study presents a novel method for the reconstruction of the temperature distribution inside firebox of a coal power plant. A set of experimental measurements was performed on the premises of a large commercial coal power plant. The distribution of the temperature has been reconstructed using spectrometry measurements. Radiative heat transfer model was used to solve inverse problem by damped least-squares (Levenberg-Marquardt) method. This research offers experimental, and measurement set up in power plant based on two spectrometers. Two probes were coupled to two identical spectrometers via optical fiber cables. The temperature field distribution was measured in one dimension, along the line of sight between two horizontally opposed optical probes. The advantage of this method is in its simplicity and in addition, it enables the faster determination of temperature profile. The new method avoids the need for an insertion of cooled probes deep into the firebox. It also enables calculating of the average attenuation coefficient which is related to the concentration of particles in the flame. This method gives the opportunity to be modified for determination of 2D and 3D temperature distributions.