Planar Laser-Induced Fluorescence and Chemiluminescence Analyses of CO2-Argon-Steam Oxyfuel (CARSOXY) Combustion

Odi Fawwaz Alrebei,Phil Bowen,Syed Mashruk,Agustin Valera Medina,Abdulkarem I Amhamed

doi:10.3390/en15010263

Odi Fawwaz Alrebei, Phil Bowen + Show 3 more

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https://doi.org/10.3390/en15010263

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Journal: Energies	Publication Date: Dec 31, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Cardiff University, Hamad bin Khalifa University

Abstract

Strict regulations and acts have been imposed to limit NOx and carbon emissions. The power generation industry has resorted to innovative techniques to overcome such a low level of tolerance. Amongst those in the literature, CO2-argon-steam oxyfuel (CARSOXY) gas turbines have theoretically been proven to offer an economically sustainable solution while retaining high efficiency. Although theoretical studies have characterized CARSOXY, no experimental evidence has been provided in the literature. Therefore, this paper attempts to experimentally assess CARSOXY in comparison to a CH4/air flame. OH* chemiluminescence integrated with OH Planar Laser-Induced Fluorescence (PLIF) imaging has been utilized to study flame stability and flame geometry (i.e., the area of highest heat intensity (AOH¯Max center of highest heat intensity (COH¯Max)) over a range of working fluid Reynolds’ numbers and oxidizing equivalence ratios. In addition, the standard deviation of heat release fluctuations (σOH*/OH¯) has been utilized as the base-criteria to compare the stability performance of CARSOXY to CH4/air combustion. Moreover, turbulence-chemistry interactions have been described using Damköhler numbers and by plotting Borghi regime diagrams. This paper suggests a modified numerical approach to estimate Damköhler numbers and plot regime diagrams for non-premixed combustion by utilizing the Buckingham π theorem based on experimental observations and results. CARSOXY flames showed lower flame intensity than that of the CH4/air flame throughout the entire Re interval by approximately 16%, indicating higher heat release. The Damköhler numbers of the CARSOXY flame were also greater than those of the CH4/air flame in all conditions, indicating more uniform CARSOXY flames. It was found that the tendency of the CARSOXY flame of approaching the concentrated reaction zone is greater than that of the CH4/air flame.

Highlights

IntroductionThe vast majority of gas turbines use air as an oxidizer
The Damköhler number (Da) of the CO2 -argon-steam oxyfuel (CARSOXY) flame was greater than one and greater than that of the CH4 /air in all conditions, indicating that the rate of chemical reaction is faster than the characteristic flow velocity in comparison to CH4 /air flames throughout the Reynolds numbers (Re) interval ([2000–3750])
The Da of the CARSOXY was always greater than that of the CH4 /air flame in all conditions, indicating more thin and uniform flames, indicating that the rate of chemical reaction is faster than the characteristic flow velocity in comparison to quantifying the effect of each individual CARSOXY component on the flame behavior is recommended as a future research goal by testing CH4 /CO2 -O2, CH4 /Ar -O2 flames against CH4 /air flame at constant equivalence ratios to identify the role of CO2 and the results presented in this paper contribute to the effort of promoting CARSOXY to industry

Summary

Introduction

The vast majority of gas turbines use air as an oxidizer Such a practice has, cumulatively, been accountable for a large part of the greenhouse effect over the last 30 years, with. The Clean Air Act. 1990 of the United States reduced the tolerated NOx emission level from 75 ppm to 10 ppm within less than 15 years [2]. It was necessary to increase the pixel intensities where the laser energy was lower than the maximum laser energy across the laser sheet. This was accomplished by converting the averaged and background corrected laser sheet image—Figure 4A—into an (X-Y-I) MATLAB matrix.

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