Off-Design Performances of an Organic Rankine Cycle for Waste Heat Recovery from Gas Turbines

Carcasci, Carlo; Cheli, Lapo; Lubello, Pietro; Winchler, Lorenzo

doi:10.3390/en13051105

Cited by 7 publications

(5 citation statements)

References 32 publications

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“…In [28] authors proved that increasing of geothermal steam quality by supplying exhaust gas from a gas turbine to the installation has a positive effect on the system efficiency and power. Paper [29] presents an off-design analysis of a gas turbine Organic Rankine Cycle (ORC) combined cycle. Combustion turbine performances are significantly affected by fluctuations in ambient conditions, leading to relevant variations in the exhaust gases' mass flow rate and temperature.…”

Section: Figurementioning

confidence: 99%

“…Figure29. The stream of condensate fed from the KQ1 condenser to the XN1-XN4 low-pressure heat recovery exchangers as a function of gas turbine power: 1 -maximum fixed stream of 319.4 kg/s fresh steam fed to steam turbine; 2 -minimum steam boiler output of 133.3 kg/s and gas turbine operating with rated power, 2' -minimum steam boiler output of 133.3 kg/s and gas turbine operating with 60% of its rated power.…”

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confidence: 99%

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Power and Frequency Control in the National Power System of the 370 MW Coal Fired Unit Superstructured with a Gas Turbine

et al. 2020

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A very important task of power units with high power capacity is their participation in the control of the national power system. One of the most important questions posed at work is whether a 370 MW power unit superstructured with a gas turbine in parallel and a heat recovery steam generator be able to take part in the national power system control and if such an upgrade will be economically effective. The analysis was carried out using a proprietary and novel mathematical model. The model takes into account, among others, the influence of the ambient temperature on the parameters of the gas turbine and the changes in thermal steam parameters at its steam extractions as a result of load changes. The results of the analyses showed that it is possible for the modernized unit to participate in the power system control. It can be done only by using a gas turbine with a variable power and a shut off option. The presented results of economic calculations show that at price and cost levels assumed for calculations, the turbine gas superstructure is at the threshold of viability and the investment carries a high degree of risk.

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Section: Figurementioning

confidence: 99%

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Power and Frequency Control in the National Power System of the 370 MW Coal Fired Unit Superstructured with a Gas Turbine

et al. 2020

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“…The paper [16] presents an analysis of a power plant operation with a gas turbine and ORC. It was found in the paper that the outdoor air parameters significantly affect the plant efficiency, primarily due to the impact on the air condenser operation.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of Scheme and Regenerator Parameters for Trinary Power Cycles

et al. 2023

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Natural gas-fired combined cycle plants are nowadays one of the most efficient and environmentally friendly energy complexes. High energy efficiency and low specific emissions are achieved primarily due to the high average integral temperature of heat supply in the Brayton–Rankine cycle. In this case, the main sources of energy losses are heat losses in the condenser of the steam turbine plant and heat losses with the exhaust gases of the waste heat boiler. This work is related to the analysis of the thermodynamic and economic effects in the transition from binary to trinary cycles, in which, in addition to the gas and steam–water cycles, there is an additional cycle with a low-boiling coolant. A method for the feasibility study of a waste heat recovery unit for trinary plants is proposed. The schematic and design solutions described will ensure the increased energy and economic performance of combined cycle power plants. Based on the results of the thermodynamic optimization of the structure and parameters of thermal schemes, it was found that the use of the organic Rankine cycle with R236ea freon for the utilization of the low-grade heat of a trinary plant’s exhaust gases operating from a GTE-160 gas turbine makes it possible to achieve a net electrical efficiency of 51.3%, which is a 0.4% higher efficiency for a double-circuit combined cycle gas turbine plant and a 2.1% higher efficiency for a single-circuit cycle with similar initial parameters. On the basis of the conducted feasibility study, the parameters and characteristics of the heat exchangers of the regenerative system of the waste heat recovery unit are substantiated. The use of plain fin-and-tube heat exchangers in the regenerative system of the utilization cycle is the most promising solution. It was found that the level of allowable pressure loss in the regenerator of 10 kPa and the degree of regeneration of 80% allow for maximum economic efficiency of the waste heat recovery unit.

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“…This book contains the successful invited submissions [1][2][3][4][5][6][7][8][9] to a Special Issue of Energies entitled "Organic Rankine Cycle for Energy Recovery System", focusing on a modern technology committed to energy saving and thus capable of producing positive environmental outcomes. Indeed, the organic Rankine cycle (ORC) is a thermodynamic concept already demonstrated as an engineering viable solution for waste heat recovery systems.…”

Section: Introductionmentioning

confidence: 99%

“…The papers by Valencia et al [2] present a numerical study on energy and exergy performance of ORC as bottomer of a reciprocating gas engine, while the study by Carcasci et al [3] analyses ORC off-design performance as WHR of gas turbines. These two studies consider different ORC configurations and fluids and both papers show the actual applicability of the technology to well established stationary prime movers for the 1-10 MW size range of power.…”

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confidence: 99%