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Research Papers: Energy Systems Analysis

Temperature Measurement Using Infrared Spectral Band Emissions From H2O

[+] Author and Article Information
Daniel J. Ellis

Department of Mechanical Engineering,
Brigham Young University,
435 CTB, Brigham Young University,
Provo, UT 84602
e-mail: daniel.j.ellis@outlook.com

Vladimir P. Solovjov

Department of Mechanical Engineering,
Brigham Young University,
435 CTB, Brigham Young University,
Provo, UT 84602
e-mail: lemberg.v@gmail.com

Dale R. Tree

Mem. ASME
Department of Mechanical Engineering,
Brigham Young University,
435 CTB, Brigham Young University,
Provo, UT 84602
e-mail: treed@byu.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 17, 2015; final manuscript received December 18, 2015; published online February 1, 2016. Assoc. Editor: Ashwani K. Gupta.

J. Energy Resour. Technol 138(4), 042001 (Feb 01, 2016) (7 pages) Paper No: JERT-15-1312; doi: 10.1115/1.4032425 History: Received August 17, 2015; Revised December 18, 2015

Currently, there is no satisfactory method for measuring the temperature of the gas phase of combustion products within a solid fuel flame. The industry standard, a suction pyrometer or aspirated thermocouple, is intrusive, spatially and temporally averaging, and difficult to use. In this work, a new method utilizing the spectral emission from water vapor is investigated through modeling and experimental measurements. The method employs the collection of infrared emission from water vapor over discrete wavelength bands and then uses the ratio of those emissions to infer temperature. This method was demonstrated in the products of a 150 kWth natural gas flame along a 0.75 m line of sight, averaged over 1 min. Results from this optical method were compared to those obtained using a suction pyrometer. Data were obtained at three fuel air equivalence ratios that produced products at three temperatures. The optical measurement produced gas temperatures approximately 3–4% higher than the suction pyrometer. The uncertainty of the optical measurements is dependent on the gas temperature being ±9% at 850 K and 4% or less above 1200 K. Broadband background emission assumed to be emitted from the reactor wall was also seen by the optical measurement and had to be removed before an accurate temperature could be measured. This complicated the gas measurement but also provides the means whereby both gas and solid emission can be measured simultaneously.

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References

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Figures

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Fig. 1

Modeling results for CO2 and H2O emission intensity between 600 and 7400 cm−1 at a temperature of 1200 K, optical path length of 0.5 m, total pressure of 1 atm, and a concentration of 10%

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Fig. 2

H2O emission intensity between 5185 and 5800 cm−1 at a temperature of 1200 K, optical path length of 0.5 m, pressure of 1 atm, and a concentration of 10%, split into the subsections A–E

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Fig. 3

Resulting ratios for integrated intensity bands for the ratios E/A, E/B, and E/C between 300 and 3000 K

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Fig. 4

Temperature as a function of integrated band intensity ratio (A/E) for various H2O concentrations

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Fig. 5

Diagram of optical probe comprised of outer casing, lens holder, lens, fiber holder, fiber, and argon purge lines

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Fig. 6

Optical probe, fiber, and FTIR with nitrogen purge

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Fig. 7

Experimental setup featuring the BFR, optical pyrometer, suction pyrometer, and the FTIR

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Fig. 8

Calibration curves for three incident intensities (temperatures)

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Fig. 9

Temperatures profiles measured with the suction pyrometer

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Fig. 10

Measured spectral intensity data (a) raw data with regions indicated where a Planck curve (dashed line) was fit to nongas emitting regions (gray) and (b) corrected spectral intensity from gas emission only

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Fig. 11

Time progression of temperatures for Condition 1

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Fig. 12

Time progression of temperatures for Condition 2

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Fig. 13

Time progression of temperatures for Condition 3

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