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Waste heat recovery system for nuclear power plants using the gas hydrate heat cycle

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  • Obara, Shin'ya
  • Tanaka, Ryu

Abstract

About 33% of the thermal energy produced in nuclear reactions is converted into electricity. The remaining 67 is released, for example, into the sea, etc., as waste heat. Therefore, waste heat recovery and its use in nuclear power plants (NPPs) are important for increasing the power generation efficiency. Therefore, in this paper, an absorption refrigerator using reactor cooling water (waste heat) and seawater as heat sources was used to generate cold heat, where a gas hydrate heat cycle (GHC) was introduced into the temperature difference between this cold heat and the waste heat of an NPP as an attempt to increase its power generation efficiency. The main specifications, including the gas hydrate power system (GPS) performance, were inferred from the results of previous experiments. In order to clarify the economics of the system, the discounted cash flow (DCF) method was proposed to reveal the payback period of the investment. Also, for case study analysis, a typical Japanese NPP (Kyushu Electric Power Co., Ltd., Genkai NPP Unit 4, pressurized water reactor with a rated power output of 1180 MWe and a thermal power output of 3423 MWth) was investigated. As a result, it was found that the proposed system can improve the power generation efficiency by 8.7%. The results also showed that the generation end efficiency of the GHC is more than 40% and that the payback period by the simple integration balance and net present value is 11 years. Also, it was found that the payback period in the case of the DCF method is 19.8 years.

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  • Obara, Shin'ya & Tanaka, Ryu, 2021. "Waste heat recovery system for nuclear power plants using the gas hydrate heat cycle," Applied Energy, Elsevier, vol. 292(C).
    • Handle: RePEc:eee:appene:v:292:y:2021:i:c:s0306261921001975
    DOI: 10.1016/j.apenergy.2021.116667
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    References listed on IDEAS

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    3. Park, Joon Ho & Park, Jungjoon & Lee, Jae Won & Kang, Yong Tae, 2023. "Progress in CO2 hydrate formation and feasibility analysis for cold thermal energy harvesting application," Renewable and Sustainable Energy Reviews, Elsevier, vol. 187(C).
    4. Tongu, Daiki & Obara, Shin'ya, 2024. "Formation temperature range expansion and energy storage properties of CO2 hydrates," Renewable and Sustainable Energy Reviews, Elsevier, vol. 189(PB).
    5. Shi, Yu & Li, Dong & An, Yichao & Zhang, Liang & Li, Jun & Fu, Qian & Zhu, Xun & Liao, Qiang, 2023. "Power generation enhancement of a membrane-free thermally regenerative battery induced by the density difference of electrolytes," Applied Energy, Elsevier, vol. 344(C).
    6. Qin, Jiyou & Chinen, Daigo & Obara, Shin'ya, 2022. "Storage and discharge efficiency of small-temperature-difference CO2 hydrate batteries with cyclopentane accelerators," Applied Energy, Elsevier, vol. 308(C).
    7. Li, Junjie & Zhang, Yueling & Yang, Yanli & Zhang, Xiaomei & Wang, Nana & Zheng, Yonghong & Tian, Yajun & Xie, Kechang, 2022. "Life cycle assessment and techno-economic analysis of ethanol production via coal and its competitors: A comparative study," Applied Energy, Elsevier, vol. 312(C).
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    9. Y., Nandakishora & Sahoo, Ranjit K. & S., Murugan & Gu, Sai, 2023. "4E analysis of the cryogenic CO2 separation process integrated with waste heat recovery," Energy, Elsevier, vol. 278(PA).

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