Remote quantification of smokestack effluent mass flow rates using imaging Fourier transform spectrometry

Jacob L. Harley; Kevin C. Gross

doi:10.1117/12.883193

3 June 2011 Remote quantification of smokestack effluent mass flow rates using imaging Fourier transform spectrometry

Jacob L. Harley, Kevin C. Gross

Proceedings Volume 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII; 801813 (2011) https://doi.org/10.1117/12.883193
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

A Telops Hyper-Cam midwave infrared (1.5 - 5.5μm) imaging Fourier-transform spectrometer (IFTS) was used to estimate industrial smokestack total effluent mass flow rates by combining spectrally-determined species concentrations with flow rates estimated via analysis of sequential images in the raw interferogram cube. Measurements of the coalburning smokestack were made with the IFTS at a stand-off distance of 350m. 185 hyperspectral datacubes were collected on a 128(W)×64(H) pixel sub-window (11.4×11.4cm² per pixel) at a 0.5cm^-1 spectral resolution. Strong emissions from H₂O, CO₂, CO, SO₂, and NO were observed in the spectrum. A previously established single-layer radiative transfer model was used to estimate gas concentrations immediately above stack exit, and results compared reasonably with in situ measurements. A simple temporal cross-correlation analysis of sequential imagery enabled an estimation of the flow velocity at center stack. The estimated volumetric flow rate of 106±23m/s was within 4% of the reported value. Final effluent mass flow rates for CO₂ and SO₂ of 13.5±3.8kg/s and 71.3±19.3g/s were in good agreement with in situ rates of 11.6±0.1kg/s and 67.8±0.5g/s. NO was estimated at 16.1±4.2g/s, which did not compare well to the total NO_x (NO +NO₂) reported value of 11.2±0.2g/s. Unmonitored H₂O, HCl , and CO were also estimated at 7.76±2.25kg/s, 7.40±2.00g/s, and 15.0±4.1 g/s respectively.

Citation Download Citation

Jacob L. Harley and Kevin C. Gross "Remote quantification of smokestack effluent mass flow rates using imaging Fourier transform spectrometry", Proc. SPIE 8018, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XII, 801813 (3 June 2011); https://doi.org/10.1117/12.883193

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