Part-load analysis of gas turbine &amp; ORC combined cycles

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

doi:10.1016/j.applthermaleng.2011.11.068

Cited by 59 publications

(22 citation statements)

References 17 publications

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“…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%

“…Tables 8 and 9 present the predicted performance of the plant at design conditions and the average performance of the retrofitted plants (both layouts) during year 2007 respectively. [11] by the authors, where an analysis of gas turbine and ORC bottoming systems is presented. In the existing wastewater station, the annual electricity consumption is 15590 MWh, 10400.6 MWh of which are produced by the CHP plant.…”

Section: Heat Recovery Vapour Generatormentioning

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: Heat Recovery Vapour Generatormentioning

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.

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show abstract

“…The control system utilized subsequently the optimal operation point at part load. A cascade type of control has been implemented in the combined gas turbine-ORC system by de Escalona et al [104]. The study focused on the benefits from the addition of the ORC for waste heat recovery and considered part load conditions in the ORC performance.…”

Section: Control Approachesmentioning

confidence: 99%

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

2015

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Efficient power generation from low to medium grade heat is an important challenge to be addressed to ensure a sustainable energy future. Organic Rankine Cycles (ORCs) constitute an important enabling technology and their research and development has emerged as a very active research field over the past decade. Particular focus areas include working fluid selection and cycle design to achieve efficient heat to power conversions for diverse hot fluid streams associated with geothermal, solar or waste heat sources. Recently, a number of approaches have been developed that address the systematic selection of efficient working fluids as well as the design, integration and control of ORCs. This paper presents a review of emerging approaches with a particular emphasis on computer-aided design methods.

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4E Analyses and Tri-objective Optimization of a Gas Turbine-Based Combined Heat and Power System

Nondy

Gogoi

Shukla

2023

Lecture Notes in Mechanical Engineering

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Part-load analysis of gas turbine & ORC combined cycles

Cited by 59 publications

References 17 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

Systematic Methods for Working Fluid Selection and the Design, Integration and Control of Organic Rankine Cycles—A Review

4E Analyses and Tri-objective Optimization of a Gas Turbine-Based Combined Heat and Power System

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