Energy, exergy and economic analysis of different integrated systems for power generation using LNG cold energy and geothermal energy

Pan, Jie; Li, Mofan; Zhu, Meifang; Li, Ran; Tang, Linghong; Bai, Junhua

doi:10.1016/j.renene.2022.12.021

Cited by 31 publications

(1 citation statement)

References 28 publications

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“…The recycling of LNG cold energy can avoid resource waste. Among many LNG cold energy recovery and utilization technologies, cold energy power generation is an effective way to efficiently recover and utilize cold energy. , The organic Rankine cycle using LNG cold energy as a cold source is usually used as the basic power generation mode . However, the power output power of the ORC is unstable owing to the discontinuity of the LNG gasification process, the influence of heat source temperature, the LNG gasification rate, and other parameters on the ORC, making the connection of the power to the grid difficult.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of a Novel System Integrating ORC, Hydrogen Production, and Seawater Desalination with LNG Cold Energy: Energy, Economic, and Environmental Analyses

Chen,

Mu,

et al. 2023

Energy Fuels

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The utilization problem of fluctuating power generated by the organic Rankine cycle (ORC) system using LNG (liquefied natural gas) cold energy and saving freshwater was studied using a novel system (CPDH system) by combining power generation, hydrogen production, and seawater desalination. The fluctuating power was transferred to a PEME (proton exchange membrane electrolyzer) for hydrogen production via water electrolysis. Moreover, the residual cold energy after power generation was used directly for seawater desalination to obtain freshwater and improve the utilization efficiency of LNG cold energy. The desalted freshwater was transferred to PEME for hydrogen production. A mathematical optimization model was established with the maximum net earnings of the system as the goal. A case study was conducted to validate the thermodynamic, economic, and environmental performance advantages of the novel system. Results show that the cold energy utilization efficiency of the novel system increases by 72.54, 69.43, 68.35, and 80.21% during spring, summer, autumn, and winter, respectively. The cold energy utilization exergy efficiency increases by 1.27, 1.63, 1.41, and 0.91%, respectively, compared to the system without seawater desalination. In addition, the net earning of the system was 65547.18 $/year when the novel system operates at summer ambient temperature, which could save 7688.34 m 3 /year of freshwater resources and reduce CO 2 emission by 111.14 t/year.

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Section: Introductionmentioning

confidence: 99%