Sensitivity analysis and dynamic modelling of the reinjection process in a binary cycle geothermal power plant of Larderello area

Pouriya H. Niknam; Lorenzo Talluri; Daniele Fiaschi; Giampaolo Manfrida

doi:10.1016/j.energy.2020.118869

Sensitivity analysis and dynamic modelling of the reinjection process in a binary cycle geothermal power plant of Larderello area

Pouriya H. Niknam, Lorenzo Talluri, Daniele Fiaschi^*, Giampaolo Manfrida

^*Corresponding author for this work

Chemical Engineering

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Abstract

The surface equipment design for a binary cycle geothermal power plant including facilities required for the power cycle and the complete reinjection process of two-phase geothermal fluid (H₂O + non-condensable gases (NCGs)) in the Castelnuovo area of Larderello are modelled. The proposed scheme includes the configuration of closed-loop power plant, NCGs compression train and reinjection process at the wellhead. Steady-state and dynamic simulations are performed. The steady-state model is developed to find the correct operating solutions and conditions, while the dynamic model investigates the unsteady behaviour of the system. The study includes a sensitivity analysis of surface equipment design, demonstrating the effect of internal and external variables on the system performance, including power cycle, compression train and reinjection process. The maximum compressor power consumption (at 60 bar reinjection pressure) is 176 kW at 8% CO₂ mass fraction into the geothermal fluid. The unsteady system behaviour at startup and its response to step-changes of flow stream condition is assessed: it is found that the average response-time is about 20 min. Also, the system requires a drain pressure higher than the saturation level for effective reinjection. A new Antoine – based correlation for water-CO₂ mixture is proposed for geothermal applications.

Original language	English
Article number	118869
Journal	Energy
Volume	214
Early online date	18 Sept 2020
DOIs	https://doi.org/10.1016/j.energy.2020.118869
Publication status	Published - 1 Jan 2021

Bibliographical note

Funding Information:
The present research has received funding from the European Union's H2020 research and innovation programme under the Project GECO (Geothermal Emissions COntrol), Contract Nr 818169.

Funding Information:
The present research has received funding from the European Union’s H2020 research and innovation programme under the Project GECO (Geothermal Emissions COntrol), Contract Nr 818169.

Keywords

Binary cycle
Dynamic simulation
Geothermal fluid
Geothermal power plant
Total reinjection
Water-CO mixture

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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NiknamP2021SensitivityFinal published version, 3.25 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

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abstract = "The surface equipment design for a binary cycle geothermal power plant including facilities required for the power cycle and the complete reinjection process of two-phase geothermal fluid (H2O + non-condensable gases (NCGs)) in the Castelnuovo area of Larderello are modelled. The proposed scheme includes the configuration of closed-loop power plant, NCGs compression train and reinjection process at the wellhead. Steady-state and dynamic simulations are performed. The steady-state model is developed to find the correct operating solutions and conditions, while the dynamic model investigates the unsteady behaviour of the system. The study includes a sensitivity analysis of surface equipment design, demonstrating the effect of internal and external variables on the system performance, including power cycle, compression train and reinjection process. The maximum compressor power consumption (at 60 bar reinjection pressure) is 176 kW at 8% CO2 mass fraction into the geothermal fluid. The unsteady system behaviour at startup and its response to step-changes of flow stream condition is assessed: it is found that the average response-time is about 20 min. Also, the system requires a drain pressure higher than the saturation level for effective reinjection. A new Antoine – based correlation for water-CO2 mixture is proposed for geothermal applications.",

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N1 - Funding Information: The present research has received funding from the European Union's H2020 research and innovation programme under the Project GECO (Geothermal Emissions COntrol), Contract Nr 818169. Funding Information: The present research has received funding from the European Union’s H2020 research and innovation programme under the Project GECO (Geothermal Emissions COntrol), Contract Nr 818169.

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AB - The surface equipment design for a binary cycle geothermal power plant including facilities required for the power cycle and the complete reinjection process of two-phase geothermal fluid (H2O + non-condensable gases (NCGs)) in the Castelnuovo area of Larderello are modelled. The proposed scheme includes the configuration of closed-loop power plant, NCGs compression train and reinjection process at the wellhead. Steady-state and dynamic simulations are performed. The steady-state model is developed to find the correct operating solutions and conditions, while the dynamic model investigates the unsteady behaviour of the system. The study includes a sensitivity analysis of surface equipment design, demonstrating the effect of internal and external variables on the system performance, including power cycle, compression train and reinjection process. The maximum compressor power consumption (at 60 bar reinjection pressure) is 176 kW at 8% CO2 mass fraction into the geothermal fluid. The unsteady system behaviour at startup and its response to step-changes of flow stream condition is assessed: it is found that the average response-time is about 20 min. Also, the system requires a drain pressure higher than the saturation level for effective reinjection. A new Antoine – based correlation for water-CO2 mixture is proposed for geothermal applications.

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Sensitivity analysis and dynamic modelling of the reinjection process in a binary cycle geothermal power plant of Larderello area

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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