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Experimental study on combustion characteristics and lean blow-out limits of non-premixed oxy-methane flames in a porous-plate reactor

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Abstract

The combustion characteristics and lean blow-out (LBO) limits of non-premixed oxy-methane flames in a face-to-face two-porous-plates reactor are experimentally investigated in this study. The reactor mimics the process of oxygen permeation and oxy-fuel combustion inside high-temperature membrane reactors (HTMRs). The fuel (CH4) was supplied together with CO2 in the main longitudinal stream while the oxygen was supplied via the upper and lower rectangular porous plates. The experiments were conducted over ranges of equivalence ratio (0.5, 0.7 and 1.0), CO2 percentage in the oxidizer mixture (0, 27, 35, 55 and 70%), and fuel firing rate (0.5, 0.75, 1.0, 1.5, 2, 2.5 and 3 kW). At fixed CO2%, there was insignificant increase in flame length while increasing the equivalence ratio. The flame luminous intensity was found to be decreasing while increasing CO2%. Increase in the LBO limit was obtained with the increase in the equivalence ratio at fixed fuel firing rate. The minimum limit of O2% to allow for a visible flame was found to be about 21% (79% CO2) at stoichiometric condition. The increase in fuel firing rate decreased CO2% at blow-out condition due to attainment of the required flow speed that overwhelmed the increase in flame speed.

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Acknowledgments

The authors like to appreciate the support from King Fahd University of Petroleum and Minerals (KFUPM) to perform this work through the deanship of research on project number DF181028.

Funding

This study was funded by King Fahd University of Petroleum and Minerals through grant number DF181028.

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Authors and Affiliations

  1. KACST-TIC on CCS and Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia

    Mohamed A. Habib, Ibrahim B. Mansir, Medhat A. Nemitallah & Atia E. Khalifa

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  1. Mohamed A. Habib
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  2. Ibrahim B. Mansir
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  3. Medhat A. Nemitallah
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  4. Atia E. Khalifa
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Correspondence to Medhat A. Nemitallah.

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The authors like to highlight the following points:

1. The flow mixing zone created beside PP enhanced flame anchoring and stabilization.

2. Flame is located a distance from PP protects the membrane for HTMR operation.

3. Temperature beside PP lies within the operating limits of ceramic membranes.

4. Based on economics and reactor performance, stoichiometric operation is recommended.

5. The minimum limit of %O2 to allow for a visible flame was 21% (79% CO2).

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Habib, M.A., Mansir, I.B., Nemitallah, M.A. et al. Experimental study on combustion characteristics and lean blow-out limits of non-premixed oxy-methane flames in a porous-plate reactor. Heat Mass Transfer 55, 3265–3274 (2019). https://doi.org/10.1007/s00231-019-02639-5

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  • DOI: https://doi.org/10.1007/s00231-019-02639-5

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