The Experts below are selected from a list of 168 Experts worldwide ranked by ideXlab platform
M. V. Garievskii - One of the best experts on this subject based on the ideXlab platform.
-
Estimating the system efficiency of the multifunctional Hydrogen Complex at nuclear power plants
International Journal of Hydrogen Energy, 2020Co-Authors: R. Z. Aminov, A. N. Bairamov, M. V. GarievskiiAbstract:Abstract The paper deals with the primary current frequency regulation in the energy system (ES) as well as the basic requirements for NPP power units (PUs) under the conditions of involvement into the primary regulation. According to these requirements, NPP operation is related to the unloading and corresponding decrease in efficiency. It has been shown in this connection that combining NPP with a Hydrogen Complex (HEC) allows excluding the inefficient unloading mode. This enables the steam turbine and reactor equipment to operate in the basic mode at nominal power level. Besides, the conditions for producing and storing Hydrogen and oxygen during the day as well as additionally during the night-time of off-peak electrical load may be created, which allows using them for generating peak power. In the paper, the systemic economic benefit as a result of involving NPP combined with HEC into primary regulation of the current frequency in ES with allowance for expending resources for the main equipment has been estimated. In this regard, the paper gives grounds for cyclic loadings of HEC main equipment including metal tanks for storing Hydrogen and oxygen, compressors, Hydrogen-oxygen combustion chamber (HOCC) for Hydrogen-steam superheating of the actuating medium in the NPP steam turbine cycle. Methodological grounds for evaluating the equipment endurance under cyclic loading with involving into the primary frequency regulation by the criterion of the fatigue crack growth rate are described. It has been shown that in terms of HEC equipment, the highest load intensity occurs in HOCC due to high thermal stresses. Also, the systemic economic benefit has been estimated, and the impact of the equipment deterioration under conditions of cyclic loading has been demonstrated. It is shown that when combining NPP PUs with HEC, the efficiency of primary regulation may significantly depend on such factors as the cost of equipment exposed to cyclic loads, the frequency and intensity of cyclic loads, and the relation between the peak electricity tariff and the cost price of electric energy produced by NPP. It has been shown on the basis of novel methods for estimating the efficiency of involving NPP with HEC into the primary frequency regulation with allowance for damage to the equipment, that the use of HEC may provide a considerable economic benefit, as compared to the version of NPP unloading when involving directly into frequency regulation.
-
Evaluation of System Effectiveness of Multifunctional Hydrogen Complex at Nuclear Power Plants
Alternative Energy and Ecology (ISJAEE), 2019Co-Authors: R. Z. Aminov, A. N. Bayramov, M. V. GarievskiiAbstract:The paper gives the analysis of the problem of the primary current frequency regulation in the power system, as well as the basic requirements for NPP power units under the conditions of involvement in the primary regulation. According to these requirements, the operation of NPPs is associated with unloading and a corresponding decrease in efficiency. In this regard, the combination of nuclear power plants with a Hydrogen Complex is shown to eliminate the inefficient discharge mode which allows the steam turbine equipment and equipment of the reactor facility to operate in the basic mode at the nominal power level. In addition, conditions are created for the generation and accumulation of Hydrogen and oxygen during the day, as well as additionally during the nighttime failure of the electrical load which allows them to be used to generate peak power. The purpose of the article is to assess the systemic economic effect as a result of the participation of nuclear power plants in combination with the Hydrogen Complex in the primary control of the current frequency in the power sys-tem, taking into account the resource costs of the main equipment. In this regard, the paper gives the justification of cyclic loading of the main equipment of the Hydrogen Complex: metal storage tanks of Hydrogen and oxygen, compressor units, Hydrogen-oxygen combustion chamber of vapor-Hydrogen overheating of the working fluid in the steam turbine cycle of a nuclear power plant. The methodological foundations for evaluating the working life of equipment under cyclic loading with the participation in the primary frequency control by the criterion of the growth rate of a fatigue crack are described. For the equipment of the Hydrogen Complex, the highest intensity of loading is shown to occur in the Hydrogen-oxygen combustion chamber due to high thermal stresses. The system economic effect is estimated and the effect of wear of the main equipment under cyclic loading is shown. Under the conditions of combining NPP power units with a Hydrogen Complex, the efficiency of primary reg-ulation is shown to depend significantly on: the cost of equipment subjected to cyclic loading; frequency and intensity of cyclic loading; the ratio of the tariff for peak electricity, and the cost of electricity of nuclear power plants. Based on the developed methodology for assessing the effectiveness of the participation of nuclear power plants with a Hydrogen Complex in the primary frequency control, taking into account the damage to the equipment, the use of the Hydrogen Complex is shown to provide a tangible economic effect compared with the option of unloading nuclear power plants with direct participation in frequency control.
A Faure - One of the best experts on this subject based on the ideXlab platform.
-
note second virial coefficient of the water Hydrogen Complex from an explicitly correlated potential energy surface
Journal of Chemical Physics, 2011Co-Authors: Yohann Scribano, Omololu Akinojo, A FaureAbstract:The second virial coefficient, B12(T), of the H2O−H2 system has been calculated ab initio over the temperature range 200–700 K. A semi-classical method was employed with two recent accurate potential energy surfaces. The agreement with experimental data is good, although experimental error bars are much larger than the theoretical uncertainties. We show that highly correlated potentials are required for an accuracy better than 30%.
R. Z. Aminov - One of the best experts on this subject based on the ideXlab platform.
-
Estimating the system efficiency of the multifunctional Hydrogen Complex at nuclear power plants
International Journal of Hydrogen Energy, 2020Co-Authors: R. Z. Aminov, A. N. Bairamov, M. V. GarievskiiAbstract:Abstract The paper deals with the primary current frequency regulation in the energy system (ES) as well as the basic requirements for NPP power units (PUs) under the conditions of involvement into the primary regulation. According to these requirements, NPP operation is related to the unloading and corresponding decrease in efficiency. It has been shown in this connection that combining NPP with a Hydrogen Complex (HEC) allows excluding the inefficient unloading mode. This enables the steam turbine and reactor equipment to operate in the basic mode at nominal power level. Besides, the conditions for producing and storing Hydrogen and oxygen during the day as well as additionally during the night-time of off-peak electrical load may be created, which allows using them for generating peak power. In the paper, the systemic economic benefit as a result of involving NPP combined with HEC into primary regulation of the current frequency in ES with allowance for expending resources for the main equipment has been estimated. In this regard, the paper gives grounds for cyclic loadings of HEC main equipment including metal tanks for storing Hydrogen and oxygen, compressors, Hydrogen-oxygen combustion chamber (HOCC) for Hydrogen-steam superheating of the actuating medium in the NPP steam turbine cycle. Methodological grounds for evaluating the equipment endurance under cyclic loading with involving into the primary frequency regulation by the criterion of the fatigue crack growth rate are described. It has been shown that in terms of HEC equipment, the highest load intensity occurs in HOCC due to high thermal stresses. Also, the systemic economic benefit has been estimated, and the impact of the equipment deterioration under conditions of cyclic loading has been demonstrated. It is shown that when combining NPP PUs with HEC, the efficiency of primary regulation may significantly depend on such factors as the cost of equipment exposed to cyclic loads, the frequency and intensity of cyclic loads, and the relation between the peak electricity tariff and the cost price of electric energy produced by NPP. It has been shown on the basis of novel methods for estimating the efficiency of involving NPP with HEC into the primary frequency regulation with allowance for damage to the equipment, that the use of HEC may provide a considerable economic benefit, as compared to the version of NPP unloading when involving directly into frequency regulation.
-
Evaluation of System Effectiveness of Multifunctional Hydrogen Complex at Nuclear Power Plants
Alternative Energy and Ecology (ISJAEE), 2019Co-Authors: R. Z. Aminov, A. N. Bayramov, M. V. GarievskiiAbstract:The paper gives the analysis of the problem of the primary current frequency regulation in the power system, as well as the basic requirements for NPP power units under the conditions of involvement in the primary regulation. According to these requirements, the operation of NPPs is associated with unloading and a corresponding decrease in efficiency. In this regard, the combination of nuclear power plants with a Hydrogen Complex is shown to eliminate the inefficient discharge mode which allows the steam turbine equipment and equipment of the reactor facility to operate in the basic mode at the nominal power level. In addition, conditions are created for the generation and accumulation of Hydrogen and oxygen during the day, as well as additionally during the nighttime failure of the electrical load which allows them to be used to generate peak power. The purpose of the article is to assess the systemic economic effect as a result of the participation of nuclear power plants in combination with the Hydrogen Complex in the primary control of the current frequency in the power sys-tem, taking into account the resource costs of the main equipment. In this regard, the paper gives the justification of cyclic loading of the main equipment of the Hydrogen Complex: metal storage tanks of Hydrogen and oxygen, compressor units, Hydrogen-oxygen combustion chamber of vapor-Hydrogen overheating of the working fluid in the steam turbine cycle of a nuclear power plant. The methodological foundations for evaluating the working life of equipment under cyclic loading with the participation in the primary frequency control by the criterion of the growth rate of a fatigue crack are described. For the equipment of the Hydrogen Complex, the highest intensity of loading is shown to occur in the Hydrogen-oxygen combustion chamber due to high thermal stresses. The system economic effect is estimated and the effect of wear of the main equipment under cyclic loading is shown. Under the conditions of combining NPP power units with a Hydrogen Complex, the efficiency of primary reg-ulation is shown to depend significantly on: the cost of equipment subjected to cyclic loading; frequency and intensity of cyclic loading; the ratio of the tariff for peak electricity, and the cost of electricity of nuclear power plants. Based on the developed methodology for assessing the effectiveness of the participation of nuclear power plants with a Hydrogen Complex in the primary frequency control, taking into account the damage to the equipment, the use of the Hydrogen Complex is shown to provide a tangible economic effect compared with the option of unloading nuclear power plants with direct participation in frequency control.
Yohann Scribano - One of the best experts on this subject based on the ideXlab platform.
-
A quantum study of the water-Hydrogen Complex : from dimer to Hydrogen clathrate hydrate
2014Co-Authors: Yohann ScribanoAbstract:Floppy molecular systems are very challenging since a normal mode description is not possible for the description of large amplitude motion. In this talk, I will present a spectroscopic analysis of the accuracy of the recent ab initio potential of H2O-H2 for which several experimental data are now available. I will also present the efficiency of a reduced dimensional model which can reproduce rovibrational bound states with a good accuracy. In the last part, I will present the application of this two-body potential for the calculation of Translation-Rotation states of Hydrogen in water clathrates.
-
note second virial coefficient of the water Hydrogen Complex from an explicitly correlated potential energy surface
Journal of Chemical Physics, 2011Co-Authors: Yohann Scribano, Omololu Akinojo, A FaureAbstract:The second virial coefficient, B12(T), of the H2O−H2 system has been calculated ab initio over the temperature range 200–700 K. A semi-classical method was employed with two recent accurate potential energy surfaces. The agreement with experimental data is good, although experimental error bars are much larger than the theoretical uncertainties. We show that highly correlated potentials are required for an accuracy better than 30%.
Allan H Harvey - One of the best experts on this subject based on the ideXlab platform.
-
intermolecular potential and second virial coefficient of the water Hydrogen Complex
Journal of Chemical Physics, 2002Co-Authors: Matthew P Hodges, Richard J Wheatley, Gregory K Schenter, Allan H HarveyAbstract:We construct a rigid-body (five-dimensional) potential-energy surface for the water-Hydrogen Complex using scaled perturbation theory (SPT). An analytic fit of this surface is obtained, and, using this, two minima are found. The global minimum has C2v symmetry, with the Hydrogen molecule acting as a proton donor to the oxygen atom on water. A local minimum with Cs symmetry has the Hydrogen molecule acting as a proton acceptor to one of the Hydrogen atoms on water, where the OH bond and H2 are in a T-shaped configuration. The SPT global minimum is bound by 1097 microEh (Eh approximately 4.359744 x 10(-18) J). Our best estimate of the binding energy, from a complete basis set extrapolation of coupled-cluster calculations, is 1076.1 microEh. The fitted surface is used to calculate the second cross virial coefficient over a wide temperature range (100-3000 K). Three complementary methods are used to quantify quantum statistical mechanical effects that become significant at low temperatures. We compare our results with experimental data, which are available over a smaller temperature range (230-700 K). Generally good agreement is found, but the experimental data are subject to larger uncertainties.
