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September 7, 2026Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy

Ash deposition and NO x emission behaviors of high-alkali coal under air-staged dynamic parameter conditions

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Authors

DZDingwen ZhouLDLiangxu DaiGMGuowei Ma

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Overview

Experimental study demonstrates how dynamic temperature and load shifts worsen ash fouling and nitrogen oxide emissions during high-alkali coal combustion, highlighting risks for flexible power...

Key Points

  • To investigate the impacts of dynamic fluctuations in temperature and coal feeding rates on ash deposition behavior and nitrogen oxide emissions during air-staged high-alkali coal combustion.
  • Tested high-alkali coal combustion using a vertical two-stage furnace experimental system under air-staged configurations.
  • Applied dynamic parameter conditions including variable coal feeding rates, temperature ramp-up, and temperature ramp-down profiles across differing excess air ratios.
  • Dynamically increasing coal feeding rates reduced ash deposition propensity but slightly increased the fuel nitrogen conversion rate.
  • Variable temperature operations increased both nitrogen conversion rates and ash deposition propensity while significantly reducing combustion efficiency, which dropped further at an excess air ratio of 1.4.
  • Ramp-down conditions promoted calcium sulfation and iron oxide formation, whereas ramp-up conditions accelerated the generation of sodium-containing crystalline minerals, aggravating adhesive ash accumulation.

Cite This Study

Zhou et al. (2026) studied this question.

synapsesocial.com/papers/6a9e85b3c3034f961570df65https://doi.org/10.1177/09576509261486560
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