Journal of Nuclear Energy Science and Power Generation Technology最新文献

{"title":"Effect of Mineral Additives on Fusion Behavior of Agricultural Residue Ashes during Combustion or Co-combustion with Lignite","authors":"D. Vamvuka, M. Deli, A. Stratakis","doi":"10.21926/jept.2104047","DOIUrl":"https://doi.org/10.21926/jept.2104047","url":null,"abstract":"In this work, the ash fusibility behaviour of selected agricultural residues and their blends with lignite was studied, by carrying out chemical, mineralogical, fusibility and thermogravimetric analyses and calculating slagging/fouling indicators for predicting deposition tendencies in boilers. Two additives, bauxite, and clinochlore, were used at varying amounts to reduce ash melting, followed by examining their anti-fusion mechanisms. Initial deformation and softening temperatures of biomass materials were low for combustion processes operating above 900 °C due to their high concentration in K, Na, and P compounds. When the additives were mixed with raw fuels or lignite/biomass blends, the initial deformation of ashes started at temperatures up to 340 °C higher, whereas the fluid temperature in most cases exceeded 1500 °C. Bauxite was more effective than clinochlore. The positive impact of additives was attributed to the mineralogical transformations during ashing to phases with a high melting point through reactions with K, Na-bearing minerals, or CaO of fuel ashes.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81974578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using SIRES to Enhance Resilience in Remote & Rural Communities","authors":"Zeel Maheshwari, R. Ramakumar","doi":"10.21926/jept.2201006","DOIUrl":"https://doi.org/10.21926/jept.2201006","url":null,"abstract":"Rural and remote communities are more vulnerable to damage caused by extreme events as compared to urban areas. Natural disasters can disrupt basic supplies such as domestic water supply and cooking needs in addition to electricity outages. The recognition of the interlinked nature of food, water and energy has gained momentum over the past few years. Smart Integrated Renewable Energy System (SIRES) has been proposed to handle basic needs such as cooking, domestic and irrigation water supply, and electricity to remote rural areas in an efficient and sustainable manner. Critical needs and non-critical needs for a typical rural community are discussed. The proposed approach is studied for two different scenarios: wind subsystem is inoperable and hydropower is inoperable due to the destruction caused by a natural disaster. In this paper, it is shown that employing SIRES could improve overall resiliency as compared to microgrids.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82865363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variable Speed Diesel Electric Generators: Technologies, Benefits, Limitations, Impact on Greenhouse Gases Emissions and Fuel Efficiency","authors":"Raisa Barbosa, M. Issa, S. Silva, A. Ilinca","doi":"10.21926/jept.2201003","DOIUrl":"https://doi.org/10.21926/jept.2201003","url":null,"abstract":"A substantial share of the electric energy is generated with synchronous generators that provide sustained alternating current (AC) voltage and frequency energy to regional and national power systems, which subsequently transport and distribute it to diverse users. In an attempt to reduce environmental effects, electric energy markets have recently become more open, resulting in more flexible distributed electric power systems. In such distributed systems, stability, quick and efficient delivery, and control of electric power require some degree of power electronics control to allow for lower power in the electric generators to tap the primary fuel energy potential better and increase efficiency and stability. This is how variable-speed electric generators (VSEG) recently came into play, up to the 400-megavolt ampere (MVA)/ unit size, and which have been at work since 1996. This paper provides coverage of variable-speed electric diesel generators (VSDEG) in distributed generation and their impacts on fuel efficiency and greenhouse gases (GHG). It discusses permanent-magnet-(PM) synchronous generators, solutions based on power electronics such as diesel-driven wound-rotor-induction generator, doubly-fed-induction generator (DFIG), rotating stator generator, and the application of continuously variable transmission to a VSEG. The benefits and limitations of the selected technologies are also presented. The list of references given at the end of the paper should offer aids for students and researchers working in this field.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"107 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74218880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Potential of Coupling Heavy Metal (HM) Phytoremediation by Bioenergy Plants and Their Associated HM-Adapted Rhizosphere Microbiota (Arbuscular Mycorrhizal Fungi and Plant Growth Promoting Microbes) for Bioenergy Production","authors":"A. G. Khan","doi":"10.21926/jept.2104049","DOIUrl":"https://doi.org/10.21926/jept.2104049","url":null,"abstract":"There is growing concern for the contamination of our soils and waters worldwide with heavy metals (HMs), as a result of indiscriminate use of agrochemicals for feeding growing population which require optimal use of resources and sustainable agricultural strategies. This can be simultaneously achieved by using microbes as bio-fertilizers, bio-protectants, and bio-stimulants, and suitable phytoremediation- plant capable of removing heavy metals contaminants from contaminated sites. There is a growing need to adopt such environmentally safe, attractive, and economical techniques that can remove most HMs contaminants as well as yield high biomass for bioenergy production. Phytoremediation and the microbes associated with the roots and inhabiting rhizospheres of the plants used for this purpose, has emerged as an alternative strategy. This article reviews the principles and application of this strategy, and provides an overview of the use of fast growing, non-food bioenergy plants, like Vetiver grass and industrial hemp, and their root-associated microbiota such as Arbuscular Mycorrhizal Fungi (AMF), Mycorrhiza Helping Bacteria (MHB), and Plant–Growth–Promoting-Rhizobia (PGPR) that can both tolerate and immobilize HMs in the roots, i.e. sequestrate contaminant HMs thereby protecting plants from metal toxicity. This mini-review also focuses on other phytoextraction strategies involving rhizosphere microbes, such as (1) inoculating plants used for phytoremediation of HMs contaminated soil and water with rhizobial microflora, and (2) managing their population in the rhizospheres by using a consortium of site specific AMF, PGPR, and MHB, and N-fixing rhizobia as biofertilizers to Phyto-remediate derelict contaminated sites. Various crop management strategies such as Crop Sequencing and Intercropping or Co-cropping of, for example, mycorrhizal and non-mycorrhizal crops, or leguminous and non-leguminous crops, etc., can be employed for improved plant growth. Another possible strategy to exploit soil microbes is to employ pre-cropping with mycotrophic crops to exploit AMF for mycorrhizo-remediation strategy.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85546702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advances in Wind Farm Layout Optimization: Wind Direction Robustness and Wake Induced Asymmetric Thrust Load","authors":"Carsten Croonenbroeck, David Hennecke","doi":"10.21926/jept.2104044","DOIUrl":"https://doi.org/10.21926/jept.2104044","url":null,"abstract":"In this study, we address the wind farm layout optimization (WFLO) problem and tackle the issue of optimal turbine placement by incorporating additional aspects of an economically driven target function. Firstly, we have analyzed the effect of wind direction on a given turbine arrangement. Based on the direction-dependent wake pattern, practitioners sometimes shut down certain turbines on their farms. Our method computes which turbines should be shut down in which wake situation. On this basis, we have developed a method of finding new turbine setups that rarely require shutdowns and are, in a certain sense, “robust” against changes to the wind direction. Secondly, we have presented a partial coverage Jensen wake model in three-dimensional space and have provided the tools for reducing or avoiding wake-induced asymmetric thrust on the rotor disc of the turbine, which leads to reduced energy yield and accelerated wear. This aspect can also be used for finding new turbine setups that take partial coverage into account and avoid it if necessary. Overall, the application of the refinements suggested in this study will result in an increased yearly profit achieved from the produced energy in a wind farm. This is an aspect that decision-makers, such as farm planners/operators, might depend on in a market that typically possesses narrow profit margins. Our methods find entrance into the open-source research framework that comes as the package wflo for the statistical software R.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91162194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Review on High-Capacity and High-Voltage Cathodes for Next-Generation Lithium-ion Batteries","authors":"Shuvajith Ghosh, Udita Bhatta charjee, Subhajit Bhowmik, S. Martha","doi":"10.21926/jept.2201002","DOIUrl":"https://doi.org/10.21926/jept.2201002","url":null,"abstract":"lithium-ion battery (LIB) is at the forefront of energy research. Over four decades of research and development have led electric mobility to a reality. Numerous materials capable of storing lithium reversibly, either as an anode or as a cathode, are reported on a daily basis. But very few among them, such as LiCoO2, lithium nickel manganese cobalt oxide (Li-NMC) variants (LiNi0.33Mn0.33Co0.33O2, LiNi0.5Mn0.3Co0.2O2, LiNi0.6Mn0.2Co0.2O2, and LiNi0.8Mn0.1Co0.1O2), LiNi0.8Co0.15Al0.05O2, LiFePO4, graphite, and Li4Ti5O12 are successful at commercial scale. Future energy requirements demand a push in the energy density of LIBs to meet the criteria of electric aviation, power trains, stationary grids, etc. All these applications have different needs which cannot be satisfied by a particular set of materials. Therefore, various materials need to be utilized in widespread fields of battery applications in the near future. This review discusses potential cathode materials that show a capacity of ≥ 250 mAh g-1 (Li-rich oxides, conversion materials, etc.) or average voltage of ≥ 4 V vs. Li+/Li (polyanionic materials, spinel oxides, etc.). Failure mechanisms, challenges, and way-outs to overcome all the issues are put forward to determine commercial viability.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"52 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90820748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Aqueous Lithium--Air Batteries with High Power Density at Room Temperature under Air Atmosphere","authors":"Hironari Minami, Hiroaki Izumi, Takumi Hasegawa, Fan Bai, Daisuke Mori, S. Taminato, Y. Takeda, O. Yamamoto, N. Imanishi","doi":"10.21926/jept.2103041","DOIUrl":"https://doi.org/10.21926/jept.2103041","url":null,"abstract":"Rechargeable batteries with higher energy and power density exceeding the performance of the currently available lithium-ion batteries are suitable for application as the power source in electric vehicles (EVs). Aqueous lithium-air batteries are candidates for various EV applications due to their high energy density of 1910 Wh kg-1. The present study reports a rechargeable aqueous lithium-air battery with high power density at room temperature. The battery cell comprised a lithium anode, a non-aqueous anode electrolyte, a water-stable lithium-ion-conducting NASICON type separator, an aqueous catholyte, and an air electrode. The non-aqueous electrolyte served as an interlayer between the lithium anode and the solid electrolyte because the solid electrolyte in contact with lithium was unstable. The mixed separator comprised a Kimwipe paper and a Celgard polypropylene membrane for the interlayer electrolyte, which was used for preventing the formation of lithium dendrites at a high current density. The proposed aqueous lithium-air battery was successfully cycled at 2 mA cm-2 for 6 h at room temperature under an air atmosphere.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88785092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of the Flash Ironmaking Technology (FIT) for Green Ironmaking with Low Energy Consumption","authors":"H. Sohn, M. Elzohiery, D. Fan","doi":"10.21926/jept.2103042","DOIUrl":"https://doi.org/10.21926/jept.2103042","url":null,"abstract":"This article describes the development of a novel ironmaking technology based on flash reduction. The development started with the proof of the kinetic feasibility, considering that a typical flash reactor provides only a few seconds of residence time. This was followed by tests in a laboratory flash reactor and finally a pilot plant operation. The rate equations formulated in this work were developed considering the optimum combination of temperature, residence time, and reducing gas partial pressure to achieve > 95% reduction degree. Experiments in the intermediate-scale laboratory flash reactor indicated that more than 90% reduction degree could be obtained in a few second residence time at temperature as low as 1175 °C. A pilot reactor operating at 1200–1550 °C was installed and run to collect data necessary for scaling up the process. The tests in this large reactor validated the design concept in terms of heat supply and residence time, and identified technical hurdles. This investigation proved the technical feasibility of the flash ironmaking technology. The results of this work will facilitate the design for the industrial flash ironmaking reactor. The novel technology is expected to decrease the energy consumption in ironmaking by up to 44% compared with the average blast furnace process, and will reduce CO2 emissions by up to 51%. When hydrogen is used, the proposed process would use up to 60% less energy with little carbon dioxide emissions. However, it is noted that the energy requirements and CO2 emissions during the production of natural gas, hydrogen or coal must be added for a comprehensive comparison.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91026113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrogen Storage in Cryogenic, Cybernetic, and Catalytic Vessels for Transport Vehicles","authors":"E. Ilisca","doi":"10.21926/jept.2104045","DOIUrl":"https://doi.org/10.21926/jept.2104045","url":null,"abstract":"Most of the hydrogen storage vessels meant for vehicles to run the electric motor via a fuel cell during transport are designed for drives of only a few tenths of kilometers per day. The present report, however, describes a vessel model that is conceived to hold the hydrogen energy only for short periods during transport, such as a few hours. This would include transport via a light-duty vehicle, a taxi, or a bus, which would load liquid hydrogen at a station every morning for the day. This is a simple model based on the novel concept of Double Open Vessel (DOV), in which the liquid H2 is loaded inside an open container inserted inside another open container. The walls of this DOV are constituted of simplified linings that allow the entry of thermal heat nearly a hundred times greater than that allowed by the cryo-compressed vessels with higher insulation. After loading, the liquid evaporates, while the gas flows around its initial container into which it was loaded, passes through a few porous plugs, and is gradually released towards the Fuel Cell (or toward an ignition motor). Such a counter-flow of the gas creates a retroaction effect that insulates the inner container, thereby delaying the increases in temperature and pressure. The successive porous plugs installed in the space between the two containers form a system of barrages that regulate the gas flow through successive expansions of decreasing pressures. In addition, these catalytic plugs convert a portion of the loaded hydrogen into its ortho variety, acting as a heat pump, while temporarily storing the other portion. Collectively, these effects maintain the internal pressures below 150 bar. The proposed design for the DOV models is convenient to manufacture and has a lighter weight, and consequently, a low cost.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"183 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72392287","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variation of CO2-Brine Contact Angles on Natural Rocks of Different Compositions","authors":"Foad Haeri, Deepak Tapriyal, Christopher Matranga, D. Crandall, A. Goodman","doi":"10.21926/jept.2104046","DOIUrl":"https://doi.org/10.21926/jept.2104046","url":null,"abstract":"Contact angles were measured for CO2-brine interactions on 20 different rocks that represent the properties of various CO2 storage depositional environments to characterize the wettability during geologic carbon storage. Three different CO2 phases (gaseous, liquid, and supercritical) were considered to investigate the effect of pressure and temperature. Bubbles were studied in two groups of larger and smaller than 500 μm, the latter being more relevant to pore scale. Variation was observed among contact angle measurements, even while controlling the sample preparation and cleanliness. The contact angle variations could mainly be attributed to natural sample heterogeneity, as shown by an increased range of measured values for the smallest bubbles studied. Despite these variations, the analysis of 1139 contact angle measurements on 20 samples under 3 different experimental conditions showed that 92.8% of the angles were below 40°, meaning that the samples were primarily strongly-to-moderately water-wet with the average contact angle of 22°. 10% of the angles under supercritical conditions were between 40° and 60°. This range of angles constitutes 5% and 4% of the measurements under liquid and gaseous conditions, respectively. Therefore, supercritical CO2 was observed to be more wetting than liquid or gaseous CO2.","PeriodicalId":53427,"journal":{"name":"Journal of Nuclear Energy Science and Power Generation Technology","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89206518","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}