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Cogeneration of substitute natural gas and power from coal by moderate recycle of the chemical unconverted gas

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  • Li, Sheng
  • Jin, Hongguang
  • Gao, Lin

Abstract

The thermodynamic analysis and the coupling and optimization between chemical synthesis and power generation in a polygeneration system are presented. Unlike full conversion of syngas into chemicals in the traditional SNG (synthetic natural gas) production system, by moderate conversion the sharp increase in energy consumption for SNG synthesis can be avoided in the new system. Also, by recovering the chemical unconverted gas for combined cycle, electricity is cogenerated efficiently. Results show that the overall efficiency of the novel system can be as high as 59%–65%. And compared to single production systems, the (energy saving ratio) ESR of the new system is over 11.0% and the energy consumption for SNG production can be decreased by around 12%. Sensitivity analysis shows that an optimized conversion ratio of SNG, (chemicals to power output ratio) CPOR, recycle ratio of the unconverted gas Ru, and pressure ratio of gas turbine can lead to the maximum of ESR. Abolishing the syngas composition adjustment and improving the inlet temperature of gas turbine both can help to enhance the system efficiency. Under low Ru, improving the H2/CO mole ratio in the syngas helps to improve system efficiency, while under high Ru, an optimized H2/CO can lead to the maximum of ESR.

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  • Li, Sheng & Jin, Hongguang & Gao, Lin, 2013. "Cogeneration of substitute natural gas and power from coal by moderate recycle of the chemical unconverted gas," Energy, Elsevier, vol. 55(C), pages 658-667.
    • Handle: RePEc:eee:energy:v:55:y:2013:i:c:p:658-667
    DOI: 10.1016/j.energy.2013.03.090
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    1. Wolfersdorf, Christian & Boblenz, Kristin & Pardemann, Robert & Meyer, Bernd, 2015. "Syngas-based annex concepts for chemical energy storage and improving flexibility of pulverized coal combustion power plants," Applied Energy, Elsevier, vol. 156(C), pages 618-627.
    2. Li, Sheng & Ji, Xiaozhou & Zhang, Xiaosong & Gao, Lin & Jin, Hongguang, 2014. "Coal to SNG: Technical progress, modeling and system optimization through exergy analysis," Applied Energy, Elsevier, vol. 136(C), pages 98-109.
    3. He, Yangdong & Zhu, Lin & Li, Luling & Rao, Dong, 2019. "Life-cycle assessment of SNG and power generation: The role of implement of chemical looping combustion for carbon capture," Energy, Elsevier, vol. 172(C), pages 777-786.
    4. Timo Blumberg & Max Sorgenfrei & George Tsatsaronis, 2015. "Design and Assessment of an IGCC Concept with CO 2 Capture for the Co-Generation of Electricity and Substitute Natural Gas," Sustainability, MDPI, vol. 7(12), pages 1-13, December.
    5. Li, Sheng & Gao, Lin & Jin, Hongguang, 2017. "Realizing low life cycle energy use and GHG emissions in coal based polygeneration with CO2 capture," Applied Energy, Elsevier, vol. 194(C), pages 161-171.
    6. Su, Bosheng & Han, Wei & He, Hongzhou & Jin, Hongguang & Chen, Zhijie & Zheng, Jieqing & Yang, Shaohui & Zhang, Xiaodong, 2020. "Using moderate carbon dioxide separation to improve the performance of solar-driven biogas reforming process," Applied Energy, Elsevier, vol. 279(C).
    7. Yi, Qun & Feng, Jie & Wu, Yanli & Li, Wenying, 2014. "3E (energy, environmental, and economy) evaluation and assessment to an innovative dual-gas polygeneration system," Energy, Elsevier, vol. 66(C), pages 285-294.
    8. Wu, Handong & Gao, Lin & Jin, Hongguang & Li, Sheng, 2017. "Low-energy-penalty principles of CO2 capture in polygeneration systems," Applied Energy, Elsevier, vol. 203(C), pages 571-581.
    9. Li, Sheng & Jin, Hongguang & Gao, Lin & Zhang, Xiaosong, 2014. "Exergy analysis and the energy saving mechanism for coal to synthetic/substitute natural gas and power cogeneration system without and with CO2 capture," Applied Energy, Elsevier, vol. 130(C), pages 552-561.
    10. Zhu, Lin & He, Yangdong & Li, Luling & Lv, Liping & He, Jingling, 2018. "Thermodynamic assessment of SNG and power polygeneration with the goal of zero CO2 emission," Energy, Elsevier, vol. 149(C), pages 34-46.
    11. Forman, Clemens & Gootz, Matthias & Wolfersdorf, Christian & Meyer, Bernd, 2017. "Coupling power generation with syngas-based chemical synthesis," Applied Energy, Elsevier, vol. 198(C), pages 180-191.
    12. Li, Hengchong & Yang, Siyu & Zhang, Jun & Kraslawski, Andrzej & Qian, Yu, 2014. "Analysis of rationality of coal-based synthetic natural gas (SNG) production in China," Energy Policy, Elsevier, vol. 71(C), pages 180-188.
    13. Yi, Qun & Wu, Guo-sheng & Gong, Min-hui & Huang, Yi & Feng, Jie & Hao, Yan-hong & Li, Wen-ying, 2017. "A feasibility study for CO2 recycle assistance with coke oven gas to synthetic natural gas," Applied Energy, Elsevier, vol. 193(C), pages 149-161.
    14. Fan, Junming & Hong, Hui & Jin, Hongguang, 2018. "Biomass and coal co-feed power and SNG polygeneration with chemical looping combustion to reduce carbon footprint for sustainable energy development: Process simulation and thermodynamic assessment," Renewable Energy, Elsevier, vol. 125(C), pages 260-269.
    15. Zhou, Huairong & Meng, Wenliang & Wang, Dongliang & Li, Guixian & Li, Hongwei & Liu, Zhiqiang & Yang, Sheng, 2021. "A novel coal chemical looping gasification scheme for synthetic natural gas with low energy consumption for CO2 capture: Modelling, parameters optimization, and performance analysis," Energy, Elsevier, vol. 225(C).

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