@article{Romanov2020314,

title = {Use of Carbon Nano Fibers in the Production of Metal Hydride Compacts},

author = {I. A. Romanov and V. I. Borzenko and A. N. Kazakov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85098231935&doi=10.1134%2fS1995078020030118&partnerID=40&md5=67202b1941db1320e515f3922ddeb09d},

doi = {10.1134/S1995078020030118},

year  = {2020},

date = {2020-01-01},

journal = {Nanotechnologies in Russia},

volume = {15},

number = {3-6},

pages = {314-318},

abstract = {Carbon nanomaterials are being actively implemented in various energy fields, including hydrogen. One of the main problems for the development and implementation of metal hydride technologies is the low thermal conductivity of fine powders of hydride-forming materials. This feature, given the rather high values of the heat of reaction of intermetallic compounds with hydrogen, leads to an increase in the cost of the design of reactors with metal hydrides and heat exchangers, which reduces the competitiveness of hydrogen-based technologies. One of the most promising ways of solving this problem today is the formation of compacts from powders of metal hydrides with additives that increase thermal conductivity by pressing. We investigated compacts based on intermetallic compounds AB5-type composition LaNi4.4Al0.3Fe0.3 prepared using various techniques, and a comparison of their properties with the free filling of this metal hydride was carried out. Carbon nanofibers and nickel-based foam were used as additives to improve the thermal conductivity of the compacts. The main methods for studying the properties of samples were the measurement of the absorption and desorption isotherms of hydrogen in the pressure-composition-temperature coordinates and the temperature inside the samples during their heating and interaction with hydrogen. The compacts showed a noticeable improvement in thermal conductivity, with a slight deterioration in hydrogen sorption properties. © 2020, Pleiades Publishing, Ltd.},

note = {cited By 1},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kazakov20204685,

title = {Experimental investigations of AB5-type alloys for hydrogen separation from biological gas streams},

author = {A. N. Kazakov and I. A. Romanov and S. V. Mitrokhin and E. A. Kiseleva},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076855670&doi=10.1016%2fj.ijhydene.2019.11.207&partnerID=40&md5=b47f4df1ee47f46ce6f3977e1b975796},

doi = {10.1016/j.ijhydene.2019.11.207},

year  = {2020},

date = {2020-01-01},

journal = {International Journal of Hydrogen Energy},

volume = {45},

number = {7},

pages = {4685-4692},

abstract = {AB5-type intermetallic compounds are suitable materials for hydrogen separation due to their ability selectively absorb hydrogen from different gas streams, including biologically produced ones. Recent studies show that metal hydride-based purification systems can effectively extract hydrogen from biogas with high CO2 concentration. Alloys LaNi5-xMx (M = Fe, Al, Mn, Sn) are prepared and activated during several cycles of H2 sorption/desorption and their PCT properties are measured in Sievert's type apparatus. Two compositions LaNi4.4Fe0.3Al0.3 and LaNi4.6Mn0.2Al0.2 are chosen for further investigations because they meet the requirements for biohydrogen separation system. After PCT measurements of 50-g samples, metal hydride powders are investigated by means of Quantochrome Nova 1200 and scanning electron microscopy to determine porosity, average particle size, specific surface area and permeability of metal hydride bed. Powder bed permeabilities are defined as 9.08 × 10−13 m2 for LaNi4.4Fe0.3Al0.3 and 6.86 × 10−13 m2 for LaNi4.6Mn0.2Al0.2 by Kozeny-Carman equation. AB5 type LaNi4.4Fe0.3Al0.3 and LaNi4.6Mn0.2Al0.2 alloys show good characteristics: low equilibrium pressures 0.025–0.03 MPa and acceptable reversible hydrogen capacity 1.1 %wt. for stationary hydrogen separation system. © 2019 Hydrogen Energy Publications LLC},

note = {cited By 6},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aminov2020410,

title = {Experimental Evaluation of the Composition of the Steam Generated during Hydrogen Combustion in Oxygen},

author = {R. Z. Aminov and A. I. Schastlivtsev and A. N. Bayramov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85090121082&doi=10.1134%2fS0018151X20030013&partnerID=40&md5=c98e60e4b4097bba93ebe7e382368be8},

doi = {10.1134/S0018151X20030013},

year  = {2020},

date = {2020-01-01},

journal = {High Temperature},

volume = {58},

number = {3},

pages = {410-416},

abstract = {Abstract: The existing experiments on hydrogen combustion with a mixture of the resulting steam and a cooling component (steam or water) are analyzed. The results of an experimental test on a hydrogen–oxygen combustion chamber without mixing of the resulting water vapor and a cooling component are presented. The methodology and results of the determination of the degree of hydrogen underburning in the composition of the resulting steam are presented. Tests were carried out for stoichiometric combustion conditions and with an excess of oxidizing agent. It is shown that the hydrogen underburn is 0.32 vol % during stoichiometric combustion and at an oxygen excess of 1.4 the hydrogen underburn is 0.27 vol %. © 2020, Pleiades Publishing, Ltd.},

note = {cited By 4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Schastlivtsev20199450,

title = {Experimental study of the processes in hydrogen-oxygen gas generator},

author = {A. Schastlivtsev and D. Dunikov and V. Borzenko},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85062636252&doi=10.1016%2fj.ijhydene.2019.02.126&partnerID=40&md5=f90ef441c2d5d3f4af26c64f457ef9c7},

doi = {10.1016/j.ijhydene.2019.02.126},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Hydrogen Energy},

volume = {44},

number = {18},

pages = {9450-9455},

abstract = {The paper presents a hydrogen-oxygen gas generator, which could be a key element of a novel scheme of hybrid hydrogen-air energy storage system, which proposes to store energy in both compressed air and hydrogen. At a power generation mode, hydrogen is combusted in oxygen, the produced steam is mixed with air and the gas mixture is used in a conventional gas turbine. The experimental hydrogen-oxygen gas generator has produced gas with temperatures 953–1163 K at pressures 2–4 MPa and has reached the thermal capacity up to 210 kW and thermal efficiency up to 95–99%. Separation of the combustion zone and air injection has helped to reduce NOx content in the product gas to 11 mg/st.m3. © 2019 Hydrogen Energy Publications LLC},

note = {cited By 9},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Dunikov20197422,

title = {Pressure artifacts at isothermal operation of a metal hydride tank},

author = {D. O. Dunikov and D. V. Blinov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85061728702&doi=10.1016%2fj.ijhydene.2019.01.278&partnerID=40&md5=70934f18995ad0042113681c8a9948cd},

doi = {10.1016/j.ijhydene.2019.01.278},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Hydrogen Energy},

volume = {44},

number = {14},

pages = {7422-7427},

abstract = {The paper presents the results of experimental investigations on hydrogen absorption and desorption in the metal hydride reactor RS-1 containing 81 kg of La 0.5 Nd 0.5 Al 0.1 Fe 0.4 Co 0.2 Ni 4.3 intermetallic compound at 60 °C isothermal conditions. During the reactor-scale measurements of pressure-composition isotherms we observe pressure artifacts; pressures for absorption are higher and for desorption are lower than equilibrium pressures obtained after cooling down and reheating of the reactor. This thermal relaxation procedure removes the pressure artifacts. The observed effect is similar to the large aliquot effect, and mostly affects the desorption isotherm. The highest measured pressure difference is 0.7 bar (11%). © 2019 Hydrogen Energy Publications LLC},

note = {cited By 5},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Borzenko20196086,

title = {Hydrogen sorption properties of metal hydride beds: Effect of internal stresses caused by reactor geometry},

author = {V. I. Borzenko and I. A. Romanov and D. O. Dunikov and A. N. Kazakov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85060769034&doi=10.1016%2fj.ijhydene.2019.01.052&partnerID=40&md5=27c6ea1d651918ce4dcc14dbdc83df8a},

doi = {10.1016/j.ijhydene.2019.01.052},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Hydrogen Energy},

volume = {44},

number = {12},

pages = {6086-6092},

abstract = {A number of peculiarities in sorption behavior of metal hydride beds depending on the reactor geometry have been discovered. Comparison of PCT absorption and desorption isotherms was conducted for the same 500 g sample of La 0·9 Ce 0·1 Ni 5 -alloy and two different geometries: horizontal half-cylinder and vertical annular. This approach gives the way to directly investigate the influence of the bed geometry on the hydrogen sorption properties excluding the effect of other factors. The influence of the internal stresses in the fine dispersed beds of intermetallic compounds on their sorption properties is discussed in the present study. The occurrence of internal stresses in the vertical annular metal hydride bed results in the decrease of the hydrogen equilibrium pressure, increase of the enthalpy and entropy of hydrogen absorption and decrease of pressure hysteresis due to significantly stronger decrease of absorption pressure compared to desorption. The analysis of SEM images of the sample taken from the bottom of the working autoclave showed the presence of a macro particle which avoided the dispersion due to the agglomerated particles around. © 2019 Hydrogen Energy Publications LLC},

note = {cited By 13},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tomarov2019760,

title = {Optimization Investigations of a Combined Binary-Cycle Geothermal Power Plant with Two Separation Pressures and Flashed Steam Superheating Using a Hydrogen–Oxygen Steam Generator},

author = {G. V. Tomarov and V. I. Borzenko and A. A. Shipkov},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85073361720&doi=10.1134%2fS0040601519100069&partnerID=40&md5=e90ef08421708f5f7d3c97fbee0a20ff},

doi = {10.1134/S0040601519100069},

year  = {2019},

date = {2019-01-01},

journal = {Thermal Engineering},

volume = {66},

number = {10},

pages = {760-768},

abstract = {Abstract—: The article considers the specific features of and prospects for improving the efficiency of geothermal power plants (GeoPPs) that use a steam–water mixture from geothermal fields and steam superheating as an energy source. The process flow diagram of a combined binary-cycle GeoPP with two separation pressures and flashed steam superheating with the use of a hydrogen–oxygen steam generator is proposed. The advisability of using a separator downstream of the high-pressure section for decreasing the steam moisture at the turbine condenser inlet is substantiated. The article also presents the results from numerical optimization investigations of the effect that the choice of organic working fluid has on the efficiency, safety, and environmental characteristics of the binary installation used as part of a combined-cycle GeoPP. The following groups of organic substances as possible candidates for use as working fluid are considered: nontoxic, nonflammable, and nonexplosive ones (group I); low-toxic, nonflammable, and nonexplosive ones (group II); nontoxic inflammable ones (group III); and low-toxic, inflammable, and explosive ones (group IV). Typical dependences characterizing the effect that the pressure in the expander and the saturation pressure in the evaporator have on the binary turbine net power output, on the specific flowrate of separated geothermal brine per unit power capacity, on the binary cycle efficiency, and on the GeoPP efficiency as a whole are shown taking as examples the use of cyclobutane and octafluoropropane as a working fluid. For a few working fluids, the existence of extremes in the above-mentioned dependences is established, which determine the binary installation optimal power values and the minimal geothermal brine specific flowrate. Based on the numerical analysis results, limitations are imposed on the admissible maximum and minimum pressure values in the binary circuit. Bar charts of calculated process characteristics influencing the binary turbine flow path’s design and efficiency are plotted. A priority (according to the maximum net power output criterion) list of working fluids relating to the group of environmentally friendly organic substances for the combined-cycle GeoPP binary installation with flashed steam superheating taking into account process-related limitations is drawn up. © 2019, Pleiades Publishing, Inc.},

note = {cited By 4},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Khayrullina20191244,

title = {Novel kW scale hydrogen energy storage system utilizing fuel cell exhaust air for hydrogen desorption process from metal hydride reactor},

author = {A. G. Khayrullina and D. Blinov and V. Borzenko},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85068554494&doi=10.1016%2fj.energy.2019.07.021&partnerID=40&md5=a64feac4bcc7dc403e69c29fb52636ce},

doi = {10.1016/j.energy.2019.07.021},

year  = {2019},

date = {2019-01-01},

journal = {Energy},

volume = {183},

pages = {1244-1252},

abstract = {In the narrative of changing energy production environment, renewable sources of energy provide a fundamental basis for the growth of energy storage technologies. In particular, many settlements in Russia and other countries are located outside the centralized grids. With the goal of replacing diesel engines, a pilot project with solar panels produced 30 000 kWh. However, a support of energy storage systems is needed to ensure higher replacement percentage. The present paper introduces the development of a novel kW-scale power production unit that utilizes metal-hydride (MH) energy storage and 1 kW PEM fuel cell (FC). In the effort to enable the technology for autonomous applications, the novel concept of using FC exhaust air for hydrogen desorption process replacing an external heating agent was successfully proved. In the first two experiments, the limitations of the initial stage of the MH reactor were formulated. Warming up speed of the MH reactor was not sufficient to support the necessary hydrogen pressure level output. Third and fourth experiments provide possible solutions to this limitation: (i) higher load on the FC enable satisfactory warm-up speed of the MH reactor, (ii) higher initial pressure of MH reactor charge mitigates an initial pressure drop during the FC startup procedures. © 2019 Elsevier Ltd},

note = {cited By 14},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Khayrullina201919168,

title = {Air heated metal hydride energy storage system design and experiments for microgrid applications},

author = {A. Khayrullina and D. Blinov and V. Borzenko},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049092898&doi=10.1016%2fj.ijhydene.2018.05.145&partnerID=40&md5=36a54cfc658c4e3084262482a35b6c93},

doi = {10.1016/j.ijhydene.2018.05.145},

year  = {2019},

date = {2019-01-01},

journal = {International Journal of Hydrogen Energy},

pages = {19168-19176},

abstract = {Emerging technologies of the 21st Century introduced bi-directional flows between a big number of uncontrollable and unpredictable generators together with a need for energy storage (ES) capable of solving instability issues. With the aim of developing new control methodologies, Skoltech developed a Smart Grid laboratory that includes a variety of energy generators, and storage systems. The capabilities of the grid were expanded with a metal hydride (MH) ES and 1 kW fuel cell. MH ES performs at the near ambient temperatures and relatively low pressure, it has adjustable properties, satisfactory gravimetric H2 density, and a simple thermal management. However, existing technologies require an external heat source, which cannot serve the purpose of autonomous microgrid applications. The aim of this research was to develop and test an air heated metal hydride energy storage system that utilizes the internal waste heat of the system. Based on low power MH ES system experiments [1] and waste heat investigations [2], an air heated system with 1 m3 H2 MH reactor was developed and tested. The experiments were performed in the system that also includes 1 kW fuel cell and an electrolyzer. Obtained results show higher efficiency rate of the system due to waste heat utilization from the air-cooled polymer electrolyte membrane (PEM) FC, ensure mobility for autonomous applications, and open the opportunity for further research in the field of power system control. © 2018 Hydrogen Energy Publications LLC},

note = {cited By 8},

keywords = {},

pubstate = {published},

tppubtype = {article}

}