J. R. Wynnyckyj

Pyrometric Measurement of Dust-Laden Gas Temperature

Continuous measurement using radiation pyrometry under industrial conditions has often met with difficulties whose causes have been obscure. In this paper, the experience gained in utility boilers, with temperatures in the range of 800 °C to 1400 °C, is reported. It is shown that the inherent problems are best resolved by using a spectral pyrometer not sensitive to gas radiation. The radiation from the suspended particles thus provides the signal. A theoretical analysis is given. Heat fluxes originating from surrounding surfaces and reflected by the particles to the pyrometer play a major role. Several examples are given how problems may be resolved using process information and/or additional measurements, fed to and processed by an on-line microcomputer.