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Design and performance analysis of a Swirl Pintle injector for a 1 MWth pressurized oxy-coal combustor

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  • Chowdhury, Mehrin
  • Khan, Mohieminul Islam
  • Islam, Nawshad Arslan
  • Choudhuri, Ahsan

Abstract

Pressurized Oxy-coal combustion has the potential to achieve high thermal efficiency by recovering the latent heat of steam from flue gases and providing options for up to 95% carbon capture. This study proposes a novel burner technology for pressurized oxy-coal combustion and investigates its operability. Three burner versions are designed and tested; no swirl, swirl numbers 0.9 and 1.2 to identify optimum design parameters and performance. A commercially available Dantec Dynamics software is used to conduct the shadowgraph experiments to observe burner performance. Coal water slurry is used as fuel with three different slurry ratios where the coal percentage by weights were 30, 40 and 50. Droplet size, distribution, spray angle and jet breakup lengths are measured and analyzed to quantify the performance. The study found that increasing the swirl number enhanced atomization. Implementing swirlers allowed the jet to spread through faster primary jet separation, thus improving atomization. In addition, higher slurry ratios improved the generation of smaller particles. However, it was also found that excessive increases in oxidizer momentums negatively impact the atomization process by jet shrinkage. The study concluded that operating a pintle burner at 1.2 swirl conditions with a 40/60 slurry ratio produces optimum performance.

Suggested Citation

  • Chowdhury, Mehrin & Khan, Mohieminul Islam & Islam, Nawshad Arslan & Choudhuri, Ahsan, 2022. "Design and performance analysis of a Swirl Pintle injector for a 1 MWth pressurized oxy-coal combustor," Energy, Elsevier, vol. 261(PB).
    • Handle: RePEc:eee:energy:v:261:y:2022:i:pb:s0360544222021582
    DOI: 10.1016/j.energy.2022.125273
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    References listed on IDEAS

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