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Towards Geothermal Power Plants with Zero Greenhouse and Pollutant Gases...
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Towards Geothermal Power Plants with Zero Greenhouse and Pollutant Gases Emissions

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "H2: Geothermal".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 5546

Special Issue Editors

Dr. Daniele Fiaschi

E-Mail Website
Guest Editor
Sustainable Energy Research Group (Serg Group), Dipartimento di Ingegneria Industriale, Università degli Studi di Firenze, Viale Morgagni 44, 50135 Firenze, Italy
Interests: energy engineering; power plants; renewables
Dr. Marco Astolfi

E-Mail Website
Guest Editor
Dipartimento di Energia, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, Italy
Interests: energy systems modelling and optimization; organic rankine cycles; supercritical CO2 power systems; microgrid optimization; renewable energy; energy storage
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The issue of avoiding emissions of greenhouse and pollutant gases is becoming a concern in the development of geothermal energy conversion and utilization projects (electricity and district heating).

The geothermal resource often contains relevant amounts of non-condensable gases (NCGs), mostly CO2, but with marginal fractions of CH4, NH3, H2S, H2, Hg and other undesirable substances. The objective of developing cleaner and more sustainable geothermal energy implies avoiding or largely reducing gas emissions to the atmosphere, thus developing technologies either to reinject NCGs into the reservoir or to direct them to mineral sequestration processes. The solutions can be applied to geothermal power plants of different type (direct steam, flash, or binary/ORC) and resource conditions (water or steam-dominated reservoirs of different temperatures).

The development of these solutions calls for expertise in widely multidisciplinary fields, ranging from geochemistry to reservoir and well engineering, two-phase flows including reactivity in fractured porous media (saline equilibria and kinetics), heat–mass transfer, and power engineering.

This Special Issue of Energies focuses on studies on the general topic of CO2 sequestration, underground management of sour gases, and development of enhanced geothermal systems.

Its purpose is to attract researchers in these fields, stimulating co-operation among different disciplines and aiming to collect worldwide contributions and to reach a global audience.

Prof. Dr. Daniele Fiaschi
Dr. Marco Astolfi
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Renewable Energy
  • Zero Emission
  • Geothermal Power
  • Total Reinjection
  • Innovative Power Plants
  • Binary Cycle
  • ORC
  • CO2
  • Non Condensable Gas
  • Sulfidric Acid (H2S)
  • Water Dominant
  • Exergoeconomic
  • Borehole
  • Geothermal Brine
  • Cooling Tower
  • NCG Recompression
  • Evaporative Intercooling
  • Cogeneration
  • Heat Recovery
  • CO2–Water Solution
  • Carbonation
  • Geothermal Fluid
  • Sour Gas Compression
  • Heat Exchanger
  • Two Phase Mixture

Published Papers (2 papers)

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Research

14 pages, 3519 KiB  
Article
Improved Solubility Model for Pure Gas and Binary Mixture of CO2-H2S in Water: A Geothermal Case Study with Total Reinjection
by Pouriya H. Niknam, Lorenzo Talluri, Daniele Fiaschi and Giampaolo Manfrida
Energies 2020, 13(11), 2883; https://0-doi-org.brum.beds.ac.uk/10.3390/en13112883 - 05 Jun 2020
Cited by 10 | Viewed by 2499
Abstract
Geothermal energy is acknowledged globally as a renewable resource, which, unlike solar, wind or wave energy, can be continuously exploited. The geothermal fluids usually have some acid gas content, which needs to be precisely taken into account when predicting the actual potential of [...] Read more.
Geothermal energy is acknowledged globally as a renewable resource, which, unlike solar, wind or wave energy, can be continuously exploited. The geothermal fluids usually have some acid gas content, which needs to be precisely taken into account when predicting the actual potential of a power plant in dealing with an effective reinjection. One of the key parameters to assess is the solubility of the acid gas, as it influences the thermodynamic conditions (saturation pressure and temperature) of the fluid. Therefore, an enhanced solubility model for the CO2-H2S-water system is developed in this study, based on the mutual solubility of gases. The model covers a wide range of pressures and temperatures. The genetic algorithm is employed to calculate the correlation constants and corresponding solubility values of both CO2 and H2S as functions of pressure, temperature and the balance of the gas. The results are validated against previously published models and experimental data available in the literature. The proposed model estimates the pure gas solubility, which is also a feature of other models. The more innovative feature of the model is the solubility estimation of each CO2 or H2S in simultaneous presence, such as when the binary gas is injected into the pure water of the geothermal reinjection well. The proposed solubility model fits well with the available experimental data, with a mean deviation lower than 0.2%. Full article
(This article belongs to the Special Issue Towards Geothermal Power Plants with Zero Greenhouse and Pollutant Gases Emissions)
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37 pages, 7522 KiB  
Article
A Contribution to the Geological Characterization of a Potential Caprock-Reservoir System in the Sulcis Coal Basin (South-Western Sardinia)
by Silvana Fais, Giuseppe Casula, Francesco Cuccuru, Paola Ligas, Maria Giovanna Bianchi, Alberto Plaisant and Alberto Pettinau
Energies 2019, 12(23), 4524; https://0-doi-org.brum.beds.ac.uk/10.3390/en12234524 - 27 Nov 2019
Cited by 6 | Viewed by 2470
Abstract
The results provided by this study contribute to the geological characterization of a potential caprock-reservoir system for CO2 storage in the experimental area of the mining district of the Sulcis Coal Basin (south-western Sardinia, Italy). The work is aimed to improve the [...] Read more.
The results provided by this study contribute to the geological characterization of a potential caprock-reservoir system for CO2 storage in the experimental area of the mining district of the Sulcis Coal Basin (south-western Sardinia, Italy). The work is aimed to improve the knowledge of the petrographic and petrophysical characteristics of the siliciclastic and carbonate geological formations that make up the potential caprock-reservoir system. Core samples from a number of wells drilled in the study area for mining purposes were analyzed especially for texture and physical properties (longitudinal velocity, density, porosity, and permeability). The preliminary integrated petrographic and petrophysical characterizations indicate that the Upper Paleocene to Early Eocene potential carbonate reservoir is heterogeneous but presents suitable reservoir zones for CO2. A preliminary analysis of the potential caprock siliciclastic lithologies of the Middle Eocene to Lower Oligocene suggests that they appear suitable for CO2 confinement. Finally, to account for the stability of the investigated area, an accurate geodynamical study of south-western Sardinia was carried out using global navigation satellite system and advanced differential interferometric synthetic aperture radar methodologies in order to estimate vertical and horizontal crustal displacements. The study area results stable, since it is characterized by surface crustal horizontal and vertical velocities smaller than 1 mm/year and few mm/year, respectively. Full article
(This article belongs to the Special Issue Towards Geothermal Power Plants with Zero Greenhouse and Pollutant Gases Emissions)
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