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Article

Laser-Based, Optical, and Traditional Diagnostics of NO and Temperature in 400 kW Pilot-Scale Furnace

1
RISE Energy Technology Center, Box 726, SE-941 28 Piteå, Sweden
2
Luossavaara-Kiirunavaara AB, Box 952, SE-971 28 Luleå, Sweden
*
Author to whom correspondence should be addressed.
Academic Editors: Steven Wagner and Florian Schmidt
Appl. Sci. 2021, 11(15), 7048; https://doi.org/10.3390/app11157048
Received: 15 June 2021 / Revised: 16 July 2021 / Accepted: 21 July 2021 / Published: 30 July 2021
A fast sensor for simultaneous high temperature (above 800 K) diagnostics of nitrogen oxide (NO) concentration and gas temperature (T) based on the spectral fitting of low-resolution NO UV absorption near 226 nm was applied in pilot-scale LKAB’s Experimental Combustion Furnace (ECF). The experiments were performed in plasma and/or fuel preheated air at temperatures up to 1550 K, which is about 200 K higher than the maximal temperature used for the validation of the developed UV NO sensor previously. The UV absorption NO and T measurements are compared with NO probe and temperature measurements via suction pyrometry and tuneable diode laser absorption (TDL) using H2O transitions at 1398 nm, respectively. The agreement between the NO UV and NO probe measurements was better than 15%. There is also a good agreement between the temperatures obtained using laser-based, optical, and suction pyrometer measurements. Comparison of the TDL H2O measurements with the calculated H2O concentrations demonstrated an excellent agreement and confirms the accuracy of TDL H2O measurements (better than 10%). The ability of the optical and laser techniques to resolve various variations in the process parameters is demonstrated. View Full-Text
Keywords: NO UV absorption; temperature; TDLAS; pilot-scale furnace NO UV absorption; temperature; TDLAS; pilot-scale furnace
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MDPI and ACS Style

Sepman, A.; Fredriksson, C.; Ögren, Y.; Wiinikka, H. Laser-Based, Optical, and Traditional Diagnostics of NO and Temperature in 400 kW Pilot-Scale Furnace. Appl. Sci. 2021, 11, 7048. https://doi.org/10.3390/app11157048

AMA Style

Sepman A, Fredriksson C, Ögren Y, Wiinikka H. Laser-Based, Optical, and Traditional Diagnostics of NO and Temperature in 400 kW Pilot-Scale Furnace. Applied Sciences. 2021; 11(15):7048. https://doi.org/10.3390/app11157048

Chicago/Turabian Style

Sepman, Alexey, Christian Fredriksson, Yngve Ögren, and Henrik Wiinikka. 2021. "Laser-Based, Optical, and Traditional Diagnostics of NO and Temperature in 400 kW Pilot-Scale Furnace" Applied Sciences 11, no. 15: 7048. https://doi.org/10.3390/app11157048

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