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Impact of finite-rate kinetics on carbon conversion in a high-pressure, single-stage entrained flow gasifier with coal–CO2 slurry feed

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  • Botero, Cristina
  • Field, Randall P.
  • Herzog, Howard J.
  • Ghoniem, Ahmed F.

Abstract

Coal–CO2 slurry feed has been suggested as an attractive alternative to coal–water slurry feed for single-stage, entrained-flow gasifiers. Previous work demonstrated the system-level advantages of gasification-based plants equipped with CO2 capture and CO2 slurry feed, under the assumption that carbon conversion remains unchanged. However, gasification in carbon dioxide has been observed to be slower than that in steam. In view of this, the impact of CO2 slurry feeding on gasification kinetics and ultimately on carbon conversion and oxygen consumption in a pressurized, single-stage entrained-flow gasifier processing bituminous coal is studied here using a 1-D reduced order model. Results show that the CO2 gasification reaction plays a dominant role in char conversion when the feeding system is CO2 slurry, increasing the CO content in the products by up to a factor of two. CO inhibition of the gasification reaction and a higher degree of internal mass transport limitations lead to an up to 60% slower gasification rate, when compared to a system based on coal–water slurry. Accordingly, a gasifier with CO2 slurry feed has 15% less oxygen consumption but a 7%-point lower carbon conversion for a given reactor outlet temperature. The gasifier outlet temperature must be raised by 90K in order to achieve the same conversion as in a water slurry-fed reactor; the peak reactor temperature increases by 220K as a result. Net oxygen savings of 8% are estimated for a system with a CO2 slurry-fed gasifier relative to one with water slurry and the same level of conversion.

Suggested Citation

  • Botero, Cristina & Field, Randall P. & Herzog, Howard J. & Ghoniem, Ahmed F., 2013. "Impact of finite-rate kinetics on carbon conversion in a high-pressure, single-stage entrained flow gasifier with coal–CO2 slurry feed," Applied Energy, Elsevier, vol. 104(C), pages 408-417.
  • Handle: RePEc:eee:appene:v:104:y:2013:i:c:p:408-417
    DOI: 10.1016/j.apenergy.2012.11.028
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    References listed on IDEAS

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    1. Irfan, Muhammad F. & Usman, Muhammad R. & Kusakabe, K., 2011. "Coal gasification in CO2 atmosphere and its kinetics since 1948: A brief review," Energy, Elsevier, vol. 36(1), pages 12-40.
    2. Tremel, Alexander & Haselsteiner, Thomas & Kunze, Christian & Spliethoff, Hartmut, 2012. "Experimental investigation of high temperature and high pressure coal gasification," Applied Energy, Elsevier, vol. 92(C), pages 279-285.
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    1. Jeong, Hyo Jae & Seo, Dong Kyun & Hwang, Jungho, 2014. "CFD modeling for coal size effect on coal gasification in a two-stage commercial entrained-bed gasifier with an improved char gasification model," Applied Energy, Elsevier, vol. 123(C), pages 29-36.
    2. Li, Dedi & Liu, Jianzhong & Wang, Shuangni & Cheng, Jun, 2020. "Study on coal water slurries prepared from coal chemical wastewater and their industrial application," Applied Energy, Elsevier, vol. 268(C).
    3. Igor Donskoy, 2023. "Techno-Economic Efficiency Estimation of Promising Integrated Oxyfuel Gasification Combined-Cycle Power Plants with Carbon Capture," Clean Technol., MDPI, vol. 5(1), pages 1-18, February.
    4. Kim, Hakduck & Choi, Jeongmin & Lim, Heechang & Song, Juhun, 2021. "Enhanced combustion processes of liquid carbon dioxide (LCO2)–low rank coal slurry at high pressures," Energy, Elsevier, vol. 237(C).
    5. Lee, Hyeon-Hui & Lee, Jae-Chul & Joo, Yong-Jin & Oh, Min & Lee, Chang-Ha, 2014. "Dynamic modeling of Shell entrained flow gasifier in an integrated gasification combined cycle process," Applied Energy, Elsevier, vol. 131(C), pages 425-440.

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    Keywords

    Coal; CO2; Slurry; Gasification; Kinetics; Conversion;
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