Off-design analysis of a Hybrid Rankine-Brayton cycle used as the power block of a solar thermal power plant

Muñoz, Marta; Rovira, Antonio; Sánchez, Consuelo; Montes, María José

doi:10.1016/j.energy.2017.06.014

Cited by 22 publications

(13 citation statements)

References 36 publications

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“…The so-called combined cycle (CC) has been studied widely. 47,[59][60][61] Reheat is another useful way which can be adapted to each cycle layout if necessary.…”

Section: Sco 2 Power Cycles Candidate For Csp Plantsmentioning

confidence: 99%

“…Considering that the temperature of CO 2 exiting LTR is still high (>100°C) in terms of SC shown in Figure , to further make use of such heat so as to enhance the efficiency of SC, an organic Rankine cycle served as the bottom cycle is added. The so‐called combined cycle (CC) has been studied widely . Reheat is another useful way which can be adapted to each cycle layout if necessary.…”

Section: Power Cycles Based On Sco2mentioning

confidence: 99%

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Review of supercritical CO₂power cycles integrated with CSP

Yin

Zheng²,

Peng

et al. 2019

Int J Energy Res

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Summary Increasing demand of electricity and severer concerns to environment call for green energy sources as well as efficient energy conversion systems. SCO2 power cycles integrated with concentrating solar power (CSP) are capable of enhancing the competitiveness of thermal solar electricity. This article makes a comprehensive review of supercritical CO2 power cycles integrated with CSP. A detailed comparison of four typical CSP technologies is conducted, and the cost challenge of currently CSP technologies is pointed out. The thermophysical properties of sCO2 and the corresponding two real gas effects are analyzed elaborately to express the features of sCO2 power cycles. An extensive review of sCO2 layouts relevant for CSP including 12 single layouts and 1 combined layout is implemented logically. Strengths and weaknesses of sCO2 power cycles over traditional steam‐Rankine cycle generally adopted in current CSP plants are concluded, followed by metal material degration summary in CSP relevant temperature sCO2 environment, which shows that the nickel‐based alloy is a proper structural material candidate for sCO2‐CSP integration. Thermodynamic analyses of sCO2 power cycles when integrated with CSP are divided into three level of which design‐point analysis and off‐design modeling are conducted and compared, more researches into the off‐design point analysis, dynamic modeling, especially the transient behavior are suggested. Economic analysis of the integrated system is concluded and presents a considerable levelized cost of electricity reduction of 15.6% to 67.7% compared to that of state of art CSP. Taking the thermodynamic and economic analysis into consideration, target designs of sCO2 power cycles for CSP are summarized in three aspects. Finally, current theoretical and experimental researches of sCO2 power cycles integrated with CSP for market penetration are introduced. The strengths, weaknesses, and potential solutions to the gaps of three potential pathways (molten salt pathway, particle pathway, and gas phase pathway) to realize the integration of sCO2 power cycles in the next CSP generation plants up to 700°C are reviewed. In general, the integration of sCO2 power cycles with CSP technologies exhibits promising expectations for facilitating the competitiveness of thermal solar electricity.

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“…The so-called combined cycle (CC) has been studied widely. 47,[59][60][61] Reheat is another useful way which can be adapted to each cycle layout if necessary.…”

Section: Sco 2 Power Cycles Candidate For Csp Plantsmentioning

confidence: 99%

Section: Power Cycles Based On Sco2mentioning

confidence: 99%

Review of supercritical CO₂power cycles integrated with CSP

Yin

Zheng²,

Peng

et al. 2019

Int J Energy Res

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“…The gases exiting from Brayton cycles have potential to be recovered for several purposes such as steam generation . Brayton cycles efficiency can be improved by combining them with Rankine cycles and reduce the cost of generated electricity . In addition, by combining Brayton cycle with Rankine, lower pressure ratio is required; as a consequence, solar receiver design and operation will be facilitated .…”

Section: Brayton‐rankinementioning

confidence: 99%

“…87,88 Brayton cycles efficiency can be improved by combining them with Rankine cycles and reduce the cost of generated electricity. [89][90][91][92] In addition, by combining Brayton cycle with Rankine, lower pressure ratio is required; as a consequence, solar receiver design and operation will be facilitated. 93 Combined Rankine-Brayton cycle uses rejected heat from the Brayton cycle to run a lower temperature Rankine cycle; however, there is increase in capital cost due to requirement of new additional component installation.…”

Section: Brayton-rankinementioning

confidence: 99%

A review on solar‐assisted gas turbines

Ahmadi

Nazari

Ghasempour

et al. 2018

Energy Science & Engineering

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The thermal energy of the sun can be used for electricity generation. Solar thermal energy can be applied with fossil fuels or independently in order to reduce the cost of generated electricity and CO2 emission. Several cycles are introduced to extract solar thermal energy to be used in power plants. Brayton cycles, Rankine‐Brayton cycles, and supercritical Brayton cycles are among the most conventional ones. Based on the reviewed researches, using solar energy in addition to fossil fuels results in lower carbon dioxide emission and lower levelized cost of the generated electricity. Moreover, thermodynamic and economic analyses of the cycles revealed that heat recovery leads to higher efficiency while increase capital cost. The efficiency of solar‐assisted gas turbines depend on various parameters including pressure ratio, turbine inlet temperature, heat absorber geometry and the performance of the components. The enhancement in the efficiency of the cycles by applying each method depends on the configuration, operating condition. For instance, results have shown that 10% increase in turbine efficiency can led to 6%‐12% improvement in the efficiency of a closed‐Brayton cycle.

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“…Recently, the hybrid Rankine and Brayton (HRB) cycle [ 22 , 23 ] and double recuperative and double expansion (DRDE) cycle [ 24 ] have been proposed for working with finite sources at maximum temperatures of 400 °C. While the HRB cycle is suitable for closed heat sources [ 24 ], DRDE is a good solution for heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Analysis of an Integrated Solar Combined Cycle with Recuperative Gas Turbine and Double Recuperative and Double Expansion Propane Cycle

Rovira

Abbas

Muñoz

et al. 2020

Entropy

Self Cite

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The main objective of this paper is to present and analyze an innovative configuration of integrated solar combined cycle (ISCC). As novelties, the plant includes a recuperative gas turbine and the conventional bottoming Rankine cycle is replaced by a recently developed double recuperative double expansion (DRDE) cycle. The configuration results in a fuel saving in the combustion chamber at the expense of a decreased exhaust gas temperature, which is just adequate to feed the DRDE cycle that uses propane as the working fluid. The solar contribution comes from a solar field of parabolic trough collectors, with oil as the heat transfer fluid. The optimum integration point for the solar contribution is addressed. The performance of the proposed ISCC-R-DRDE design conditions and off-design operation was assessed (daily and yearly) at two different locations. All results were compared to those obtained under the same conditions by a conventional ISCC, as well as similar configurations without solar integration. The proposed configuration obtains a lower heat rate on a yearly basis in the studied locations and lower levelized cost of energy (LCOE) than that of the ISCC, which indicates that such a configuration could become a promising technology.

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Off-design analysis of a Hybrid Rankine-Brayton cycle used as the power block of a solar thermal power plant

Cited by 22 publications

References 36 publications

Review of supercritical CO₂power cycles integrated with CSP

Review of supercritical CO₂power cycles integrated with CSP

A review on solar‐assisted gas turbines

Analysis of an Integrated Solar Combined Cycle with Recuperative Gas Turbine and Double Recuperative and Double Expansion Propane Cycle

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Off-design analysis of a Hybrid Rankine-Brayton cycle used as the power block of a solar thermal power plant

Cited by 22 publications

References 36 publications

Review of supercritical CO2power cycles integrated with CSP

Review of supercritical CO2power cycles integrated with CSP

A review on solar‐assisted gas turbines

Analysis of an Integrated Solar Combined Cycle with Recuperative Gas Turbine and Double Recuperative and Double Expansion Propane Cycle

Contact Info

Product

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Review of supercritical CO₂power cycles integrated with CSP

Review of supercritical CO₂power cycles integrated with CSP