The Experts below are selected from a list of 5751 Experts worldwide ranked by ideXlab platform
Mario Ditaranto - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of a pre-combustion capture cycle based on hydrogen fired gas turbine with exhaust gas recirculation (EGR)
Energy Procedia, 2014Co-Authors: Mario DitarantoAbstract:Abstract Pre-combustion capture technology is a promising route to power generation with CO 2 free emissions, by transforming the Fossil Hydrocarbon fuel into a hydrogen rich fuel with near zero Carbon containing species. This gaseous fuel also allows to use a high efficiency gas turbine into a coal based power plant. The gas turbine combustor however has to meet the challenge of high temperature flame responsible for unacceptable NOx emissions, and a highly reacting fuel impeding the use of conventional dry low NOx combustion technologies. The actual solution to this problem is to dilute the hydrogen fuel with up to 50% Nitrogen. This paper presents a concept where the exhaust gas of the gas turbine is recirculated (EGR) such as to deplete the air of oxygen to produce a low temperature combustion with undiluted hydrogen fuel while flame stability is still ensured by the highly reactive properties of hydrogen. The study compares the concept with a cycle using Selective Catalytic Reduction for NOx control.
Leticia A Albaaldave - One of the best experts on this subject based on the ideXlab platform.
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paleozoic bedded barite deposits from sonora nw mexico evidence for a Hydrocarbon seep environment of formation
Ore Geology Reviews, 2014Co-Authors: Carles Canet, Abdorrahman Rajabi, Pere Anadon, Eduardo Gonzalezpartida, Pura Alfonso, Efren Perezsegura, Leticia A AlbaaldaveAbstract:Abstract The Mazatan barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exhalative (or SEDEX) deposits. A throughout study of the Mazatan barite deposits, based on petrography, fluid inclusions analyses and isotope geochemistry, confirmed the link between bedded barite and Fossil Hydrocarbon seeps, thereby leaving hydrothermal vent-related processes ruled out. Hence, modern cold seeps in continental margins would account for the geological setting and genetic aspects of this type of deposit. The largest barite bodies of Mazatan are hosted within an Upper Carboniferous flysch succession, which formed part of an accretionary wedge related to the subduction of the Rheic Ocean beneath Gondwana. As well, a few barite occurrences are hosted in Upper Devonian, pre-orogenic turbidites. A variety of mineralized structures is displayed by barite, including: septaria nodules, enterolitic structures, rosettes and debris-flow conglomerates. Barite is accompanied by chalcedony, pyrite (framboids) and berthierine. Gas-rich fluid inclusions in barite were analyzed by micro-Raman spectroscopy and methane was identified, suggesting the occurrence of light Hydrocarbons in the environment within which barite precipitated. 13 C-depleted carbonates (δ 13 C: − 24.3 to − 18.7‰) were found in the barite deposits; they likely formed through anaerobic oxidation of methane coupled to sulfate reduction. Besides, these carbonates yield negative δ 18 O values (− 11.9 to − 5.2‰) reflecting the isotopic composition of Devonian–Carboniferous seawater; alternatively, this 18 O-depletion could reflect late diagenetic processes. Methane-derived carbonates occur at modern Hydrocarbon seeps and have been reported from Mesozoic, Cenozoic and even Paleozoic seep sediments, but they have never before been described in Paleozoic bedded barite deposits. δ 34 S values of barite vary from + 17.6 to + 64.1‰, with the lowest values overlapping the range for coeval seawater sulfate; this distribution indicates a process of sulfate reduction. Barite precipitation can be explained by mixing methane- and barium-rich fluids with pore-water (seawater) containing sulfate residual from microbial reduction. Two analyses from barite gave an 87 Sr/ 86 Sr within and slightly above the range for seawater at the time of deposition, with 0.708130 and 0.708588, which would preclude the involvement of hydrothermal fluids in the mineralization process.
Carles Canet - One of the best experts on this subject based on the ideXlab platform.
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paleozoic bedded barite deposits from sonora nw mexico evidence for a Hydrocarbon seep environment of formation
Ore Geology Reviews, 2014Co-Authors: Carles Canet, Abdorrahman Rajabi, Pere Anadon, Eduardo Gonzalezpartida, Pura Alfonso, Efren Perezsegura, Leticia A AlbaaldaveAbstract:Abstract The Mazatan barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exhalative (or SEDEX) deposits. A throughout study of the Mazatan barite deposits, based on petrography, fluid inclusions analyses and isotope geochemistry, confirmed the link between bedded barite and Fossil Hydrocarbon seeps, thereby leaving hydrothermal vent-related processes ruled out. Hence, modern cold seeps in continental margins would account for the geological setting and genetic aspects of this type of deposit. The largest barite bodies of Mazatan are hosted within an Upper Carboniferous flysch succession, which formed part of an accretionary wedge related to the subduction of the Rheic Ocean beneath Gondwana. As well, a few barite occurrences are hosted in Upper Devonian, pre-orogenic turbidites. A variety of mineralized structures is displayed by barite, including: septaria nodules, enterolitic structures, rosettes and debris-flow conglomerates. Barite is accompanied by chalcedony, pyrite (framboids) and berthierine. Gas-rich fluid inclusions in barite were analyzed by micro-Raman spectroscopy and methane was identified, suggesting the occurrence of light Hydrocarbons in the environment within which barite precipitated. 13 C-depleted carbonates (δ 13 C: − 24.3 to − 18.7‰) were found in the barite deposits; they likely formed through anaerobic oxidation of methane coupled to sulfate reduction. Besides, these carbonates yield negative δ 18 O values (− 11.9 to − 5.2‰) reflecting the isotopic composition of Devonian–Carboniferous seawater; alternatively, this 18 O-depletion could reflect late diagenetic processes. Methane-derived carbonates occur at modern Hydrocarbon seeps and have been reported from Mesozoic, Cenozoic and even Paleozoic seep sediments, but they have never before been described in Paleozoic bedded barite deposits. δ 34 S values of barite vary from + 17.6 to + 64.1‰, with the lowest values overlapping the range for coeval seawater sulfate; this distribution indicates a process of sulfate reduction. Barite precipitation can be explained by mixing methane- and barium-rich fluids with pore-water (seawater) containing sulfate residual from microbial reduction. Two analyses from barite gave an 87 Sr/ 86 Sr within and slightly above the range for seawater at the time of deposition, with 0.708130 and 0.708588, which would preclude the involvement of hydrothermal fluids in the mineralization process.
Abdorrahman Rajabi - One of the best experts on this subject based on the ideXlab platform.
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Paleozoic bedded barite deposits from Sonora (NW Mexico): evidence for a Hydrocarbon seep environment of formation
'Elsevier BV', 2014Co-Authors: Canet Miquel Carles, Anadón Pere, González Partida Eduardo, Alfonso Abella, María Pura, Abdorrahman Rajabi, Alba-aldave, Leticia AAbstract:The Mazatán barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exhalative (or SEDEX) deposits. A throughout study of the Mazatán barite deposits, based on petrography, fluid inclusions analyses and isotope geochemistry, confirmed the link between bedded barite and Fossil Hydrocarbon seeps, thereby leaving hydrothermal vent-related processes ruled out. Hence, modern cold seeps in continental margins would account for the geological setting and genetic aspects of this type of deposit. The largest barite bodies of Mazatán are hosted within an Upper Carboniferous flysch succession, which formed part of an accretionary wedge related to the subduction of the Rheic Ocean beneath Gondwana. As well, a few barite occurrences are hosted in Upper Devonian, pre-orogenic turbidites. A variety of mineralized structures is displayed by barite, including: septaria nodules, enterolitic structures, rosettes and debris-flow conglomerates. Barite is accompanied by chalcedony, pyrite (framboids) and berthierine. Gas-rich fluid inclusions in barite were analyzed by micro-Raman spectroscopy and methane was identified, suggesting the occurrence of light Hydrocarbons in the environment within which barite precipitated. 13C-depleted carbonates (δ13C: − 24.3 to − 18.7‰) were found in the barite deposits; they likely formed through anaerobic oxidation of methane coupled to sulfate reduction. Besides, these carbonates yield negative δ18O values (− 11.9 to − 5.2‰) reflecting the isotopic composition of Devonian–Carboniferous seawater; alternatively, this 18O-depletion could reflect late diagenetic processes. Methane-derived carbonates occur at modern Hydrocarbon seeps and have been reported from Mesozoic, Cenozoic and even Paleozoic seep sediments, but they have never before been described in Paleozoic bedded barite deposits. δ34S values of barite vary from + 17.6 to + 64.1‰, with the lowest values overlapping the range for coeval seawater sulfate; this distribution indicates a process of sulfate reduction. Barite precipitation can be explained by mixing methane- and barium-rich fluids with pore-water (seawater) containing sulfate residual from microbial reduction. Two analyses from barite gave an 87Sr/86Sr within and slightly above the range for seawater at the time of deposition, with 0.708130 and 0.708588, which would preclude the involvement of hydrothermal fluids in the mineralization process.Peer ReviewedPostprint (updated version
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Paleozoic bedded barite deposits from Sonora (NW Mexico): evidence for a Hydrocarbon seep environment of formation
'Elsevier BV', 2014Co-Authors: Canet Miquel Carles, Anadón Pere, González Partida Eduardo, Alfonso Abella, María Pura, Abdorrahman Rajabi, Alba-aldave, Leticia AAbstract:The Mazatán barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exhalative (or SEDEX) deposits. A throughout study of the Mazatán barite deposits, based on petrography, fluid inclusions analyses and isotope geochemistry, confirmed the link between bedded barite and Fossil Hydrocarbon seeps, thereby leaving hydrothermal vent-related processes ruled out. Hence, modern cold seeps in continental margins would account for the geological setting and genetic aspects of this type of deposit. The largest barite bodies of Mazatán are hosted within an Upper Carboniferous flysch succession, which formed part of an accretionary wedge related to the subduction of the Rheic Ocean beneath Gondwana. As well, a few barite occurrences are hosted in Upper Devonian, pre-orogenic turbidites. A variety of mineralized structures is displayed by barite, including: septaria nodules, enterolitic structures, rosettes and debris-flow conglomerates. Barite is accompanied by chalcedony, pyrite (framboids) and berthierine. Gas-rich fluid inclusions in barite were analyzed by micro-Raman spectroscopy and methane was identified, suggesting the occurrence of light Hydrocarbons in the environment within which barite precipitated. 13C-depleted carbonates (δ13C: − 24.3 to − 18.7‰) were found in the barite deposits; they likely formed through anaerobic oxidation of methane coupled to sulfate reduction. Besides, these carbonates yield negative δ18O values (− 11.9 to − 5.2‰) reflecting the isotopic composition of Devonian–Carboniferous seawater; alternatively, this 18O-depletion could reflect late diagenetic processes. Methane-derived carbonates occur at modern Hydrocarbon seeps and have been reported from Mesozoic, Cenozoic and even Paleozoic seep sediments, but they have never before been described in Paleozoic bedded barite deposits. δ34S values of barite vary from + 17.6 to + 64.1‰, with the lowest values overlapping the range for coeval seawater sulfate; this distribution indicates a process of sulfate reduction. Barite precipitation can be explained by mixing methane- and barium-rich fluids with pore-water (seawater) containing sulfate residual from microbial reduction. Two analyses from barite gave an 87Sr/86Sr within and slightly above the range for seawater at the time of deposition, with 0.708130 and 0.708588, which would preclude the involvement of hydrothermal fluids in the mineralization process.Peer Reviewe
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paleozoic bedded barite deposits from sonora nw mexico evidence for a Hydrocarbon seep environment of formation
Ore Geology Reviews, 2014Co-Authors: Carles Canet, Abdorrahman Rajabi, Pere Anadon, Eduardo Gonzalezpartida, Pura Alfonso, Efren Perezsegura, Leticia A AlbaaldaveAbstract:Abstract The Mazatan barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exhalative (or SEDEX) deposits. A throughout study of the Mazatan barite deposits, based on petrography, fluid inclusions analyses and isotope geochemistry, confirmed the link between bedded barite and Fossil Hydrocarbon seeps, thereby leaving hydrothermal vent-related processes ruled out. Hence, modern cold seeps in continental margins would account for the geological setting and genetic aspects of this type of deposit. The largest barite bodies of Mazatan are hosted within an Upper Carboniferous flysch succession, which formed part of an accretionary wedge related to the subduction of the Rheic Ocean beneath Gondwana. As well, a few barite occurrences are hosted in Upper Devonian, pre-orogenic turbidites. A variety of mineralized structures is displayed by barite, including: septaria nodules, enterolitic structures, rosettes and debris-flow conglomerates. Barite is accompanied by chalcedony, pyrite (framboids) and berthierine. Gas-rich fluid inclusions in barite were analyzed by micro-Raman spectroscopy and methane was identified, suggesting the occurrence of light Hydrocarbons in the environment within which barite precipitated. 13 C-depleted carbonates (δ 13 C: − 24.3 to − 18.7‰) were found in the barite deposits; they likely formed through anaerobic oxidation of methane coupled to sulfate reduction. Besides, these carbonates yield negative δ 18 O values (− 11.9 to − 5.2‰) reflecting the isotopic composition of Devonian–Carboniferous seawater; alternatively, this 18 O-depletion could reflect late diagenetic processes. Methane-derived carbonates occur at modern Hydrocarbon seeps and have been reported from Mesozoic, Cenozoic and even Paleozoic seep sediments, but they have never before been described in Paleozoic bedded barite deposits. δ 34 S values of barite vary from + 17.6 to + 64.1‰, with the lowest values overlapping the range for coeval seawater sulfate; this distribution indicates a process of sulfate reduction. Barite precipitation can be explained by mixing methane- and barium-rich fluids with pore-water (seawater) containing sulfate residual from microbial reduction. Two analyses from barite gave an 87 Sr/ 86 Sr within and slightly above the range for seawater at the time of deposition, with 0.708130 and 0.708588, which would preclude the involvement of hydrothermal fluids in the mineralization process.
Kjell Erik Lommerud - One of the best experts on this subject based on the ideXlab platform.
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effective climate policy needs non combustion uses for Hydrocarbons
Energy Policy, 2021Co-Authors: Kai A Konrad, Kjell Erik LommerudAbstract:Abstract A central issue that is discussed in climate policy is the fear of owners of stocks of Fossil Hydrocarbon deposits that high CO2 taxes and bans on the combustion use of Hydrocarbons will turn their stocks into stranded assets. They might react by extracting and selling their reserves today: a rush to burn results. We show how the stranded-asset problem could be avoided or strongly moderated. We analyze a simple intertemporal equilibrium with a given stock of Fossil Hydrocarbons. The key variable for a climate-neutral solution to the rush-to-burn problem is to maintain existing and generate new markets for climate-neutral products from Fossil Hydrocarbons in the future. We give examples of such products. In this framework subsidies for such products (or for their innovation) also reduce the rush-to-burn problem. In contrast, the creation of substitutes for Fossil Hydrocarbon-based climate-neutral products, or subsidies for such products reduce the market for products made from Fossil Hydrocarbons. This aggravates the stranded-assets problem and thus has a climate-damaging effect.
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effective climate policy needs non combustion uses for Hydrocarbons
Research Papers in Economics, 2021Co-Authors: Kai A Konrad, Kjell Erik LommerudAbstract:A central issue that is discussed in climate policy is the fear of owners of stocks of Fossil Hydrocarbon deposits that high CO2 taxes and bans on the combustion use of Hydrocarbons will turn their stocks into stranded assets. They might react by extracting and selling their reserves today: a rush to burn results. We show how the stranded-asset problem could be avoided or strongly moderated. We analyze a simple intertemporal equilibrium with a given stock of Fossil Hydrocarbons. In this framework the following properties hold: For a climate-neutral solution to the rush-to-burn problem it is important to maintain existing and generate new markets for climate-neutral products from Fossil Hydrocarbons in the future, where we give examples for such products. Subsidies for such products (or for their innovation) reduce the rush-to-burn problem. In contrast, the creation of substitutes for Fossil Hydrocarbon-based climate-neutral products, or subsidies for such products reduce the market for products made from Fossil Hydrocarbons. This can aggravate the stranded-assets problem and thus can have a climate-damaging effect.