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Impact of ammonium sulfate and kaolin on ash deposition during co-firing of straw pellets and pulverized coal

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Abstract

This study investigated the effects of additives on reduction in ash deposit formation while co-firing straw pellets with pulverized coal. A pulverized-fuel-fired combustion system was used to co-combust sub-bituminous coal and herbaceous biomass. Kaolin (Al2Si2O5(OH)4) and ammonium sulfate ((NH4)2SO4) were used to determine the influence of additives on ash deposit reduction. Experiments were performed in an 80 kWth scale combustion system for various proportions of additives (proportions of 1 wt% and 4 wt% of fuel). Weight of deposited ash was measured concurrently. In the experimental results, different trends from several previous researches were observed regarding effectiveness of the additives: Addition of kaolin increased deposition by up to 19%, while ammonium sulfate increased deposition by up to 36%. Thermodynamic equilibrium of all experimental cases was calculated based on ash composition, and we reveal that in our experimental cases kaolin promotes formation of K-silicates of low melting temperature, while ammonium sulfate reacts with KCl to increase melting temperatures for K-Al-silicates. This demonstrates that the fuel-specific choice of additives is important to effectively reduce ash deposition.

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Acknowledgements

This study was performed as a part of the R&D project, “Optimization of combustion and flue gas treatment facilities in a coal power generation system for flexible operation” (R20GA10), supported by KEPCO (Korea Electric Power Corporation).

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Authors and Affiliations

  1. Carbon Neutral Technology R&D Department, Korea Institute of Industrial Technology, 89, Yangdaegiro-gil, Ipjang-myeon, Seobuk-gu, Cheonan-si, Chungchungnam-do, 31056, Korea

    Ho Lim, Yumi Park, Yongwoon Lee, Youngjae Lee, Taeyoung Chae, Jaewook Lee, Won Yang & Jaekwan Kim

  2. Department of Clean Process and System Engineering, University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Korea

    Won Yang

  3. KEPCO Research Institute, 105 Munji-ro, Yuseong-gu, Daejeon, 34056, Korea

    Jaekwan Kim

Authors
  1. Ho Lim
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  2. Yumi Park
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  3. Yongwoon Lee
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  4. Youngjae Lee
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  5. Taeyoung Chae
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  6. Jaewook Lee
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  7. Won Yang
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  8. Jaekwan Kim
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Correspondence to Jaewook Lee or Won Yang.

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Lim, H., Park, Y., Lee, Y. et al. Impact of ammonium sulfate and kaolin on ash deposition during co-firing of straw pellets and pulverized coal. Korean J. Chem. Eng. 39, 2089–2098 (2022). https://doi.org/10.1007/s11814-022-1175-3

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  • DOI: https://doi.org/10.1007/s11814-022-1175-3

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