Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Mutlu, B. R.; Baker, Derek K.; Kazanç, Feyza

doi:10.3390/e23060766

Cited by 10 publications

(2 citation statements)

References 47 publications

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“…Mutlu et al [21] developed a hybrid system incorporating a geothermal power plant with a topping sCO2 and bottoming Rankine combined cycle fuelled by olive residue biomass. The bottoming Rankine cycle utilized waste heat rejected from the sCO2 topping cycle, as was the existing turbine from the geothermal system.…”

Section: Introductionmentioning

confidence: 99%

Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle

Haffejee,

Rousseau,

Laubscher

2024

Preprint

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In this paper, the integrated performance of a modular biomass boiler with an existing industrial Rankine steam heat and power cycle and a supplementary supercritical-CO2 (sCO2) Brayton cycle is analyzed. The aim is to leverage the high efficiency supplementary sCO2 cycle to increase net generation and energy efficiency from the existing biomass boiler. Two sCO2 heater configurations situated within the flue gas flow path are investigated, namely a single convective-dominant heater, and a dual heater configuration with a radiative and a convective heater. A quasi-steady-state 1D model was developed to simulate the integrated cycle, including detailed component characteristics for the Rankine and Brayton cycles. The model solves the mass, energy, momentum, and species balance equations. The system is analyzed for three cases: (i) the existing Rankine cycle without the sCO2 integration, (ii) with the single convective-dominant sCO2 heater configuration, and (iii) the dual sCO2 heater configuration. The results show the required rate of overfiring for the sCO2 configurations, with a 15.3% increase in fuel flowrate resulting in an additional 21.2% in net power output. The model quantifies the impact of the sCO2 heaters, with reduced heat uptakes for downstream boiler heat exchangers. Furnace water wall heat uptake increased due to overfiring, offsetting the reduced heat uptakes at downstream evaporative heat exchangers. The dual configuration has more impact on Rankine cycle operation due to the radiative sCO2 heater placement in front of the second superheater, absorbing some of the direct radiation from the furnace.

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Section: Introductionmentioning

confidence: 99%

Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle

Haffejee,

Rousseau,

Laubscher

2024

Preprint

View full text Add to dashboard Cite

show abstract

“…In addition to the above-mentioned, there are also combined and hybrid geothermal power generation systems, such as combined single-and double-flash systems, combined flash and binary systems, geothermal-fossil hybrid systems, coal-fired plants with geothermal-heated feedwater, compound hybrid geothermal-fossil plants, gas turbinetopped geothermal flash-steam hybrid plant with superheating etc. [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Modelling and control strategy of a distributed small‐scale low‐temperature geothermal power generation system

Zhili

Dongjiao

Liu

et al. 2022

IET Renewable Power Gen

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At present, commercial geothermal power stations are mainly high‐temperature and medium‐temperature geothermal energy, while the large number of low‐temperature geothermal energy resources are rarely used for power generation applications. This paper proposes a new model for energy conversion in low‐temperature geothermal power systems. The basic structure and working principle of this new model are analysed, in detail, a low‐temperature geothermal model and a Stirling engine model for geothermal energy conversion are established, and the control strategies on the rotor and stator sides of the Stirling‐driven doubly‐fed generator are discussed. Finally, the simulation analysis is carried out, and its results show that the thermal conversion efficiency of Stirling’s engine can reach 38%, the output AC voltage of the power generation system reaches the set value 50Hz, 190V, and the DC bus voltage is constant at 300V, which verified the validity of the proposed power generation model and related control strategies. This system expands the range of available heat sources in geothermal power generation, makes geothermal power generation more flexible in terms of site selection, power generation capacity and control, and provides a new idea for geothermal power generation structure.

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Conceptual design of novel He-SCO2 Brayton cycles for ultra-high-temperature concentrating solar power

Qiu

et al. 2022

Energy Conversion and Management

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Development and Analysis of the Novel Hybridization of a Single-Flash Geothermal Power Plant with Biomass Driven sCO2-Steam Rankine Combined Cycle

Cited by 10 publications

References 47 publications

Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle

Integrated Performance of a Modular Biomass Boiler with a Combined Heat and Power Industrial Rankine Cycle and Supplementary sCO<sub>2</sub> Brayton Cycle

Modelling and control strategy of a distributed small‐scale low‐temperature geothermal power generation system

Conceptual design of novel He-SCO2 Brayton cycles for ultra-high-temperature concentrating solar power

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