Organic Rankine Cycle systems for large-scale waste heat recovery to produce electricity

Tian, Hua; Shu, Gequn

doi:10.1016/b978-0-08-100510-1.00017-x

Cited by 14 publications

(6 citation statements)

References 26 publications

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“…In combination with the thermal efficiency curve, the PGEN has a maximum power generation of 18 MW. According to [25], a PGEN cycle similar to the one used in this study can operate at partial load of 10%. This results in a minimum assigned heat transfer of 10 MW, which results in 1.8 MW of power generation at maximum thermal efficiency.…”

Section: The Applicable Component and Process Limitationsmentioning

confidence: 99%

Energy Recovery Maximisation Modelling Subject to Constrained Cooling

Bester,

Van Eldik,

Venter

2023

Energies

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The primary heat rejection cycle, which is critical for the stability and integrity of the metal production process and equipment, involves the transfer of heat from flue gas to a fluid circulated through a gas-cooler. The rate of heat transfer from the flue gas is influenced by several parameters, including the temperature of the cooling fluid. Heat transfer rates that are too high or too low can negatively impact equipment’s life, emphasising the need for a temperature operational envelope in the cooling fluid prior to entering the gas-cooler. Rejected heat is used for power generation, transferred to the environment, or both. This study examines the impact of control philosophies on both temperature and power generation, while maintaining the exit temperature within the desired range as the highest priority. A more advanced philosophy that combines bypass control with feedforward parameters can maintain temperatures within safe operating limits at all times, while improving the power generation, compared to a typical works approach which is used as a baseline. This study presents a formulation that increased power generation from an average of 6.11 MW for a typical works philosophy to 10.68 MW, while maintaining the temperature within the operating temperature envelope.

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Section: The Applicable Component and Process Limitationsmentioning

confidence: 99%

Energy Recovery Maximisation Modelling Subject to Constrained Cooling

Bester,

Van Eldik,

Venter

2023

Energies

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“…The ORC uses a low boiling point organic fluid giving it the capacity to operate at temperatures as low as 73.3 °C [7][8][9]. Thus, ORC systems can also be employed in renewable-based energy conversion as most renewable heat sources are available at temperatures of 90-500 °C [10]. In that context, the ORC is preferable to both gas and steam cycles when heat sources and plant sizes are low to medium in range as pointed out by Macchi [11].…”

Section: Introductionmentioning

confidence: 99%

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

Hossain,

Sultan,

Phung

et al. 2024

Dynamics

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Organic Rankine Cycle (ORC)–based small-scale power plants are becoming a promising instrument in the recent drive to utilize renewable sources and reduce carbon emissions. But the effectiveness of such systems is limited by the low efficiency of gas expanders, which are the main part of an ORC system. Limaçon-based expansion machines with a fast inlet control valve have great prospects as they could potentially offer efficiencies over 50%. However, the lack of a highly reliable and significantly fast control valve is hindering its possible application. In this paper, a push–pull solenoid valve is optimized using a stochastic optimization technique to provide a fast response. The optimization yields about 56–58% improvement in overall valve response. A performance comparison of the initial and optimized valves applied to a limaçon expander thermodynamic model is also presented. Additionally, the sensitivity of the valve towards a changing inlet pressure and expander rotor velocity is analyzed to better understand the effectiveness of the valve and provide clues to overall performance improvement.

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“…The operating principles of ORCs are similar to steam Rankine cycles; however, different working fluids are used. In the conventional Rankine cycles, water is used as the working fluid while different organic fluids are applicable in ORCs (Tian and Shu, 2017). The utilization of organic fluids with lower boiling temperatures compared to water makes it possible to generate power from the medium or low temperature heat sources (Tchanche et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

et al. 2021

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Organic Rankine Cycles (ORCs) are promising approaches for generating power from medium or low temperature heat sources. In this regard, ORCs can be used to indirectly produce power from solar energy. Due to intermittent nature of solar energy, storage unit should be coupled with solar ORCs to improve the output power and operating hours. In this article, studies on solar ORCs integrated with various types of storage units were reviewed; the main findings of such studies were extracted and provided. Based on the findings, several factors such as the temperature and pressure at the inlet of the turbine, as well as the operating condition affect the performance of solar ORCs with thermal storage unit just like the conventional ORCs. In addition, the optimum size of the storage unit in the solar ORCs was found to depend on the operating condition. From the financial perspective, it can be noted that the storage unit affects the corresponding indicators. Moreover, the improvement rate in the ORCs by applying storage units could be affected by the configuration of the system.

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Organic Rankine Cycle systems for large-scale waste heat recovery to produce electricity

Cited by 14 publications

References 26 publications

Energy Recovery Maximisation Modelling Subject to Constrained Cooling

Energy Recovery Maximisation Modelling Subject to Constrained Cooling

An Optimum Design for a Fast-Response Solenoid Valve: Application to a Limaçon Gas Expander

Applications of Thermal Energy Storage in Solar Organic Rankine Cycles: A Comprehensive Review

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