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Experimental study and demonstration of pilot-scale, dry feed, oxy-coal combustion under pressure

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  • Yang, Zhiwei
  • Khatri, Dishant
  • Verma, Piyush
  • Li, Tianxiang
  • Adeosun, Adewale
  • Kumfer, Benjamin M.
  • Axelbaum, Richard L.

Abstract

Pressurized oxy-combustion is a promising technology for low-carbon, fossil fuel utilization. It has the potential of improved efficiency and economics compared with conventional atmospheric pressure oxy-combustion. Washington University in St. Louis has proposed a new pressurized oxy-combustion process, namely Staged Pressurized Oxy-Combustion, which has the potential to improve further the plant efficiency, operational flexibility, and economics. This process burns pulverized coal in a pressurized, oxy-combustion environment, which has not been demonstrated in a pilot-scale system before. To address this gap, a 100 kWth pressurized oxy-combustion facility was designed and constructed. This facility has a unique burner and furnace design featuring a co-axial, low-mixing flow field, which is drastically different from conventional coal-fired boiler designs where strong mixing is sought by introducing swirl or recirculating flows. This work aims to present the first pilot-scale experimental results of a dry-feed, pressurized oxy-combustion system. The tests focused on exploring flame stability and shape, char burnout, and fine particulate matter formation. Testing results suggest that the burner has excellent flame stability. The flame shape is consistent with the design philosophy and agrees with large eddy simulations. Importantly, complete char combustion can be achieved with an oxygen mole fraction in the flue gas of only 0.8%, as opposed to a required value of ~3% for conventional atmospheric pressure air-fired or oxyfuel combustion, which reduces the costs of both oxygen generation upstream and oxygen removal downstream. The testing results show promise for dry-feed, pressurized oxy-combustion, and the new burner and furnace design.

Suggested Citation

  • Yang, Zhiwei & Khatri, Dishant & Verma, Piyush & Li, Tianxiang & Adeosun, Adewale & Kumfer, Benjamin M. & Axelbaum, Richard L., 2021. "Experimental study and demonstration of pilot-scale, dry feed, oxy-coal combustion under pressure," Applied Energy, Elsevier, vol. 285(C).
    • Handle: RePEc:eee:appene:v:285:y:2021:i:c:s0306261920317463
    DOI: 10.1016/j.apenergy.2020.116367
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    References listed on IDEAS

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