Dual-fluid-hybrid power plant co-powered by low-temperature geothermal water

a b s t r a c tThe article presents the results of modelling geothermal conditions in the Lower Triassic sedimentary formations of the Polish Lowland area (central Poland) and an electricity production model for a prospective EGS (Enhanced Geothermal System) installation situated in that area. On the basis of comprehensive analyses, this area has been selected as optimal for EGS plants operating in sedimentary complexes in the Polish Lowland. Numerical modelling was conducted using TOUGH2 code and served to evaluate the energy performance of the prospective EGS plant operating in the area. Modelling results indicate that the energy performance of the EGS plant is strongly dependent on the volume and permeability of the artificially fractured zone and its net power is dependent on the power consumed by the circulating pumps that stimulate the flow. For the top layer of the Buntsandstein formation at a depth of ca. 5500 m and temperature of ca. 170 C, the modelled net power of an EGS plant operating in the area ranged from 2 to 3 MW for a circulation of 200 m 3 /h, and at 100 m 3 /h it ranged from 1.3 to 1.6 MW depending on the permeability and volume of the fractured zone used for the circulation in question.

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“…The one-stage ORC binary system is considered here, however a two-stage ORC binary installation seems to be more efficient [35]. …”

Section: Methodology For Evaluating the Electricity And Thermal Energmentioning

confidence: 99%

Modelling geothermal and operating parameters of EGS installations in the lower triassic sedimentary formations of the central Poland area

et al. 2015

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“…This is the case for an existing 35.5 MW e installation in California, USA [22]. Borsukiewicz-Gozdur [23] has proposed a hybrid ORC concept using two working fluids. Thain and DiPippo [24] have recently explored different interesting configurations for hybrid geothermal-biomass power plants.…”

Section: Hybrid Geothermal-biomass Systemsmentioning

confidence: 99%

Integration of deep geothermal energy and woody biomass conversion pathways in urban systems

Moret

Peduzzi

Gerber

2016

Energy Conversion and Management

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Urban systems account for about two-thirds of global primary energy consumption and energy-related greenhouse gas emissions, with a projected increasing trend. Deep geothermal energy and woody biomass can be used for the production of heat, electricity and biofuels, thus constituting a renewable alternative to fossil fuels for all end-uses in cities: heating, cooling, electricity and mobility. This paper presents a methodology to assess the potential for integrating deep geothermal energy and woody biomass in an urban energy system. The city is modeled in its entirety as a multiperiod optimization problem with the total annual cost as an objective, assessing as well the environmental impact with a Life Cycle Assessment approach. For geothermal energy, deep aquifers and Enhanced Geothermal Systems are considered for stand-alone production of heat and electricity, and for cogeneration. For biomass, besides direct combustion and cogeneration, conversion to biofuels by a set of alternative processes (pyrolysis, Fischer-Tropsch synthesis and synthetic natural gas production) is studied. With a scenario-based approach, all pathways are first individually evaluated. Secondly, all possible combinations between geothermal and biomass options are systematically compared, taking into account the possibility of hybrid systems. Results show that integrating these two resources generates configurations featuring both lower costs and environmental impacts. In particular, synergies are found in innovative hybrid systems using excess geothermal heat to increase the efficiency of biomass conversion processes. The application to a case study demonstrates the advantages of using a system approach for the analysis over a stand-alone comparison between options.

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“…Hybrid plants that use other renewable energy resources, such as solar and biomass [92,106], can achieve synergy without compromising the environmental benefits or sustainability of these renewable energy resources. Geothermal power plants have been operating for over a century, that is, since 1904.…”

Section: Energy Conversion Systemsmentioning

confidence: 99%

A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid

Zhang

et al. 2015

Int. J. Energy Res.

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Summary Enhanced geothermal systems (EGS) technology is regarded as the future of geothermal energy and could become a major energy source in the future. However, EGS technology is not well developed. The challenges of EGS technology development, such as the small heat‐recovery factors and water limitations, need to be addressed. A comprehensive understanding of heat transfer in the complex subsurface structures is crucial for energy management in the reservoir, and an accurate heat transfer model of the reservoir is a key tool to optimize heat extraction to improve the heat‐recovery factor. The use of CO2 as the EGS working fluid is regarded as an emerging technology to address water limitations. The analytical solutions, lab‐scale experiments, field‐scale modeling methods of water/CO2 fluid flow and heat transfer in the reservoir, and a thermodynamic analysis of the energy conversion system at the surface are reviewed in this paper. Based on the existing literature, future research should focus on improving our knowledge and optimizing the heat transfer performance in the reservoir. Moreover, the emerging design of a heat exchange network in the reservoir and CO2‐EGS could result from technology development. Copyright © 2015 John Wiley & Sons, Ltd.

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Dual-fluid-hybrid power plant co-powered by low-temperature geothermal water

Cited by 46 publications

References 8 publications

Modelling geothermal and operating parameters of EGS installations in the lower triassic sedimentary formations of the central Poland area

Modelling geothermal and operating parameters of EGS installations in the lower triassic sedimentary formations of the central Poland area

Integration of deep geothermal energy and woody biomass conversion pathways in urban systems

A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid

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Dual-fluid-hybrid power plant co-powered by low-temperature geothermal water

Cited by 46 publications

References 8 publications

Modelling geothermal and operating parameters of EGS installations in the lower triassic sedimentary formations of the central Poland area

Modelling geothermal and operating parameters of EGS installations in the lower triassic sedimentary formations of the central Poland area

Integration of deep geothermal energy and woody biomass conversion pathways in urban systems

A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO2as working fluid

Contact Info

Product

Resources

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A review on heat transfer and energy conversion in the enhanced geothermal systems with water/CO₂as working fluid