Alternative cycles based on carbon dioxide for central receiver solar power plants

Chacartegui, Ricardo; Escalona, José M.; Sánchez, David; Monje, B.; Sánchez, T.

doi:10.1016/j.applthermaleng.2010.11.008

Cited by 199 publications

(83 citation statements)

References 29 publications

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“…In effect, the performance of these systems is strongly dependent on the thermo physical properties of the working fluid [32] and, following this rationale, the fluids considered in this work are Toluene, Cyclohexane, R245fa and Isobutane, whose critical conditions and stability limits are presented in Table 5 [10,15]. It gives the critical pressure and temperature, the maximum operating pressure, the maximum temperature as saturated vapour and the maximum temperature for the fluid stability.…”

Section: Orc Plant Performancementioning

confidence: 99%

“…The recuperative layout is feasible when organic (dry) fluids are used since they are found in superheated state at the turbine exhaust section. Hence, as a general rule of thumb, it can be considered that ORC recuperative cycles are of interest when the temperature difference between the turbine exhaust and the pump impulse section is above 50 ºC (if not, the added cost of this device is not compensated by the increased efficiency) [10,11]. Table 6 presents the specifications of the reference ORC cycle used for comparison (ΔT rec is the pinch point in the recuperator).…”

Section: Orc Plant Performancementioning

confidence: 99%

“…In the course of the analysis, which is performed with a lumped volume model of the type described in Section 3.1, recuperative and non-recuperative cycle layouts are considered and the selection of the most appropriate working fluid is done on the basis of previous works by the authors: in combined cycles with gas turbines [6,11], new concepts of solar plants [10] or compound systems with high temperature fuel cells [31]. In effect, the performance of these systems is strongly dependent on the thermo physical properties of the working fluid [32] and, following this rationale, the fluids considered in this work are Toluene, Cyclohexane, R245fa and Isobutane, whose critical conditions and stability limits are presented in Table 5 [10,15].…”

Section: Orc Plant Performancementioning

confidence: 99%

“…These ORC systems are used in a variety of low and medium temperature applications such as geothermal [8,9], waste heat recovery [10][11][12] and biomass [13,14], where the performance of the cycle mainly depends on the working fluid of choice [10,15]. In this regard, a number of working fluids as hydrocarbons and refrigerants have been studied [12,16] even if only a few of them are commercially available nowadays.…”

Section: Introductionmentioning

confidence: 99%

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Potential of ORC Systems to Retrofit CHP Plants in Wastewater Treatment Stations

Chacartegui¹,

Escalona²,

Becerra³

et al. 2013

J. sustain. dev. energy water environ. syst.

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Wastewater treatment stations take advantage of the biogas produced from sludge in anaerobic digesters to generate electricity (reciprocating gas engines) and heat (cooling water and engine exhaust gases). A fraction of this electricity is used to operate the plant while the remaining is sold to the grid. Heat is almost entirely used to support the endothermic anaerobic digestion and a minimum fraction of it is rejected to the environment at a set of fan coolers. This generic description is applicable to on-design conditions. Nevertheless, the operating conditions of the plant present a large seasonal variation so it is commonly found that the fraction of heat rejected to the atmosphere increases significantly at certain times of the year. Moreover, the heat available in the exhaust gases of the reciprocating engine is at a very high temperature (around 650 ºC), which is far from the temperature at which heat is needed for the digestion of sludge (around 40 ºC in the digesters). This temperature difference offers an opportunity to introduce an intermediate system between the engines and the digesters that makes use of a fraction of the available heat to convert it into electricity. An Organic Rankine Cycle (ORC) with an appropriate working fluid is an adequate candidate for these hot/cold temperature sources. In this paper, the techno-economic effect of adding an Organic Rankine Cycle as the intermediate system of an existing wastewater treatment station is analysed. On this purpose, different working fluids and system layouts have been studied for a reference wastewater treatment station giving rise to optimal systems configurations. The proposed systems yield very promising results with regard to global efficiency and electricity production (thermodynamically and economically).

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Section: Orc Plant Performancementioning

confidence: 99%

Section: Orc Plant Performancementioning

confidence: 99%

Section: Orc Plant Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Potential of ORC Systems to Retrofit CHP Plants in Wastewater Treatment Stations

Chacartegui¹,

Escalona²,

Becerra³

et al. 2013

J. sustain. dev. energy water environ. syst.

View full text Add to dashboard Cite

show abstract

“…In recent years, the investigations on SCO 2 Brayton cycle or SCO 2 -based solar Rankine cycle system have been covered [6][7][8]. SCO 2 cycle has been considered as the most promising and attractive candidate in concentrated solar power, coal power system, or bottoming cycle of fuel cells due to its abovementioned advantages [9][10][11]. As per turbomachinery, SCO 2 is also a promising working fluid.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Unsteady Flow Characteristics of a SCO2 Centrifugal Compressor

et al. 2017

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Supercritical carbon dioxide (SCO 2 ) is a vital working fluid in the application of power units and its high density helps to achieve a compact mechanical structure. Centrifugal compressors are of vital use in various kinds of equipment. In this paper, a SCO 2 centrifugal compressor of large input power and mass flow rate is designed and numerically investigated. A thorough numerical analysis of the unsteady flow field in the centrifugal compressor is performed in ANSYS-CFX. The computation adopts hexahedral mesh, finite volume method, and the RNG k-ε two-equation turbulence model. Streamlines, temperature, pressure, and Mach number distributions at different time steps in one revolution period are covered to present the unsteady effect of turbomachinery. Meanwhile, the force on a single rotor blade is monitored to investigate the frequency components of exciting force, thus providing the foundation for vibration analysis. Moreover, the torque, output power, pressure ratio, and isentropic efficiency in the steady and the unsteady time-averaged condition are calculated and compared with the design condition to measure the validity of the design. In summary, the unsteady computation result reveals that the unsteady flow characteristics are prominent in the designed compressor and the design of impeller and diffuser meet the requirement.

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Parameter and layout optimization of a high temperature solar combined cycle using low temperature thermal storage

Gao

Nie

et al. 2017

Env Prog and Sustain Energy

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A novel high temperature solar supercritical carbon dioxide (S‐CO2) and organic Rankine cycle (ORC) combined power system with low temperature thermal storage is introduced. The heat releasing of the S‐CO2 can be used as the heat source of the ORC. This system could keep high thermal efficiency, whereas thermal storage temperature is far lower than the maximum temperature of the system. Previous work has proved that the system efficiency can be kept at 38% when the thermal storage temperature is in the range of 220∼230°C. Basic relationship among system efficiency, power ratio and thermal storage temperature are analyzed. The key parameters of the system are optimized under certain constraints. Three possible improved layouts of this system are discussed in the end. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1234–1243, 2017

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Alternative cycles based on carbon dioxide for central receiver solar power plants

Cited by 199 publications

References 29 publications

Potential of ORC Systems to Retrofit CHP Plants in Wastewater Treatment Stations

Potential of ORC Systems to Retrofit CHP Plants in Wastewater Treatment Stations

Investigation on Unsteady Flow Characteristics of a SCO2 Centrifugal Compressor

Parameter and layout optimization of a high temperature solar combined cycle using low temperature thermal storage

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