Thermodynamics investigation of a solar power system integrated oil and molten salt as heat transfer fluids

Liu, Qibin; Zhang, Bai; Sun, Jie; Yan, Yuejun; Gao, Zhichao; Jin, Hongguang

doi:10.1016/j.applthermaleng.2015.10.071

Cited by 27 publications

(8 citation statements)

References 15 publications

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“…Moreover, the coal-dominated energy structure has also aroused serious environmental issues in China, such as the global warming, the ozone depletion, the acid rain, the pollutant emission. In this context, the utilization of the renewable energies, including the solar energy [1], geothermal energy [2], wind energy [3,4] and so on and the recovery of the kinds of waste heat [5,6] have been attracted more and more attention in order to reduce the fossil fuel consumption and improve the energy structure and increase the energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of air cooling for cold storage and power recovery of compressed air energy storage (CAES) with inter-cooling

Liu

Zhang

Shen

et al. 2016

Applied Thermal Engineering

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Section: Introductionmentioning

confidence: 99%

Characteristics of air cooling for cold storage and power recovery of compressed air energy storage (CAES) with inter-cooling

Liu

Zhang

Shen

et al. 2016

Applied Thermal Engineering

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“…To improve the performance of CSP system, the promising researches in terms of developing the novel system configurations have been performed. Liu et al 14 proposed a hybrid PT solar power system that incorporates dual solar fields with SO and MS as HTFs. The temperature of the generated steam can be increased.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al14 proposed a hybrid PT solar power system that incorporates dual solar fields with SO and MS as HTFs. Range,°C Relative Cost Concentration Ratio, sun CSP system, the promising researches in terms of developing the novel system configurations have been performed.…”

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confidence: 99%

Comprehensive assessment of line-/point-focus combined scheme for concentrating solar power system

2018

Self Cite

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Summary The line‐/point‐focus combined scheme for concentrating solar power (CSP) system is proposed. For solar field, the parabolic trough (PT) or linear Fresnel (LF) is used as the line‐focus preheating and evaporation stages while the solar tower is used as the point‐focus superheating and reheating stages. The combined schemes benefit from the high concentration ratio of point‐focus technology and low cost of line‐focus technology. Particularly, the combined scheme guarantees the concentrated solar thermal energy matching the temperature requirement of steam generation process with less exergy loss. Performance and economic assessments have been performed for 50 MWe CSP system with two of the combined schemes, ie, PT (synthetic oil, SO) + Tower (molten salt, MS) and LF (direct steam generation, DSG) + Tower (DSG), as well as existing single schemes being the references, ie, PT (SO), LF (DSG), Tower (MS), and Tower (DSG). The comparative results show that the combined schemes are superior to liner‐focus schemes in efficiency and to point‐focus schemes in capital cost and scalability. Specifically, the PT (SO) + Tower (MS) system suggests the favorable potential in practical application with the highest annual net solar‐to‐electrical energy conversion efficiency of 16.07% and the reasonable levelized cost of electricity (LCOE) of 16.121 US cent/(kW·h). This work provides an alternative guidance for future development of the CSP technology.

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“…Concentrated Solar Power plants (CSP) with Dual Loop SF are being studied since 2012 [5] for gaining the synergies between thermal oils and MS properties. In the Dual Loop SF the HTF in the primary loop is thermal oil (Dowtherm A) [6] for heating the Balance Of Plant (BOP) working fluid from ~300ºC up to ~400ºC, and a secondary loop with Solar Salt (60% NaNO 3 , 40% KNO 3 ) as HTF, for boosting the working fluid temperature from ~400ºC up to 550ºC [7,8,9]. The CSP Dual Loop state of the art technology includes Rankine power cycles, the main innovation of this paper is the integration between Dual Loop SF and the supercritical Carbon Dioxide (s-CO 2 ) Brayton power cycles [10], see Configurations 2 and 3 illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Dual Loop line-focusing solar power plants with supercritical Brayton power cycles

Coco-Enríquez

Muñoz-Antón

Martínez-Val

2017

International Journal of Hydrogen Energy

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Most of the deployed commercial line-focusing solar power plants with Parabolic Troughs (PTC) or Linear Fresnel (LF) solar collectors and Rankine power cycles use a Single Loop Solar Field (SF), Configuration 1 illustrated in Fig. 2, with synthetic oil as Heat Transfer Fluid (HTF) [1,2]. However, thermal oils maximum operating temperature should be below ~400ºC for assuring no oil degradation, hence limiting the power cycle gross efficiency up to ~38%. For overcoming this limitation Molten Salts (MS) as HTF in linear solar collectors (PTC and LF) were recently experimented in pilot facilities [3,4]. Direct MS main drawbacks are the equipments and components material corrosion and the salts freezing temperature, requiring heat tracing to avoid any sald solidification, hence increasing the Solar Field (SF) capital investment cost and parasitic energy looses. Concentrated Solar Power plants (CSP) with Dual Loop SF are being studied since 2012 [5] for gaining the synergies between thermal oils and MS properties. In the Dual Loop SF the HTF in the primary loop is thermal oil (Dowtherm A) [6] for heating the Balance Of Plant (BOP) working fluid from ~300ºC up to ~400ºC, and a secondary loop with Solar Salt (60% NaNO 3 , 40% KNO 3 ) as HTF, for boosting the working fluid temperature from ~400ºC up to 550ºC [7,8,9]. The CSP Dual Loop state of the art technology includes Rankine power cycles, the main innovation of this paper is the integration between Dual Loop SF and the supercritical Carbon Dioxide (s-CO 2 ) Brayton power cycles [10], see Configurations 2 and 3 illustrated in Fig. 3a, Fig 3b. A secondary innovation studied in this paper is the integration between thermal oil HTF (Dowtherm A) in linear solar collectors, a widely validated and mature technology, with the s-CO 2 Brayton power cycles. This technical solution is very cost competitive with carbon steel receiver pipes, low SF operating pressure, and no requiring any heat tracing.Two main conclusions are deducted from this researching study. Firstly we demonstrated the higher gross plant efficiency ~44.4%, with 550ºC Turbine Inlet Temperature (TIT), provided by the Dual Loop with the Simple recuperated s-CO2 Brayton cycle with reheating, in comparison with 41.8% obtained from the Dual Loop SF and subcritical water Rankine power cycle. And finally the second conclusion obtained is the selection of the most cost competitive plant configuration with a Single loop SF with Dowtherma A and a s-CO2 Brayton power cycle due to the receiver material low cost and no heat tracing for the thermal oil.

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Thermodynamics investigation of a solar power system integrated oil and molten salt as heat transfer fluids

Cited by 27 publications

References 15 publications

Characteristics of air cooling for cold storage and power recovery of compressed air energy storage (CAES) with inter-cooling

Characteristics of air cooling for cold storage and power recovery of compressed air energy storage (CAES) with inter-cooling

Comprehensive assessment of line-/point-focus combined scheme for concentrating solar power system

Dual Loop line-focusing solar power plants with supercritical Brayton power cycles

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