Abstract— The article presents an integrated experimental and theoretical determination of the emissivity and temperature of heterogeneous combustion products obtained from flame combustion of peat. The emissivity value set on the pyrometer depends on a large number of factors individually in each particular case, and its choice should be properly substantiated. Calculation studies of the emissivity of furnace gases (complete combustion products) with varying the temperature were carried out for the Optris CTlaser F2 and F6 pyrometers operating at wavelengths equal to 4.24 and 4.64 μm, respectively. The dependences of theoretical (true) temperatures Ttheor on the emissivity are found. The experimental measurements of furnace gas brightness temperature were carried out at different heights of the BKZ-210-140F boiler furnace. Dependences of the measured temperature Texp on the emissivity set on the pyrometer are obtained. By using the intersection points of the experimental Texp and theoretical Ttheor functions, the sought temperatures at the corresponding boiler heights were determined. For the Optris CTlaser F2 pyrometer, the furnace gas temperature in the flame root part (H = 9 m) is equal to 1182 K; it is 978 K in the flame middle part (H = 14 m) and 1031 K in the flame tail part (H = 16 m). For the Optris CTlaser F6 pyrometer, these temperatures were found to be 1154, 1034, and 1042 K, respectively. The TEMPER software that the authors have developed makes it possible to determine the furnace gas temperature with reference to the CO2 absorption band in the BKZ-210-140F steam boiler during the combustion of solid fuels (peat and coal). The block diagram of solving the temperature and emissivity determination problem is given. Based on the known mass fraction of CO2, the software produces the results on emissivity and temperature for the specified heights. By using the software, it will be possible to monitor the fuel-combustion temperature conditions to prevent the furnace slagging process from occurring and minimize nitrogen oxide emissions.
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