Numerical and experimental study of La–Ni hydriding kinetics based on the varying-size model

Song, Jing; Wang, Yuqi; Li, Shanshan; He, Ceng; Wang, Di; Yang, Fusheng; Wu, Zhen; Zheng, Lan; Zhang, Zaoxiao

doi:10.1016/j.ces.2017.11.010

Cited by 17 publications

(3 citation statements)

References 31 publications

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“…Because of the constant level of HP power the specific fuel consumption for the production of heat energy is constant for each option of HP (simple HP, HP with RHE, HP with RHE and SC) and refrigerants (R12, R22, R134a) and are 104.12 g/(kW•h) and 117.91 g/(kW•h) for power units with PT-80 and T-250 turbines, respectively. The economic effect of modernization of the heating system (heating of the return network water) was calculated based on the ratio of the proceeds from the operation of the heat pump unit (heat supply) and the corresponding costs of electricity for the compressor's motor (an increase of own needs means an increase of specific fuel consumption for the production of electric energy) [25][26][27][28][29]. Computations were made using energy tariffs (heat and electricity) for PJSC "TGK-1" in 2019 (formula 4).…”

Section: Resultsmentioning

confidence: 99%

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

et al. 2019

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Prospects for increasing the efficiency of heat and electric energy-generation and heat-and-power supply at thermal power plants obviously draw attention to such modern and innovative technologies as heat pumps. Heat pumps allow efficient redistribution of energy flows. The abundance of low-potential heat carriers and heat sources in the cycle arrangement of the thermal power plants operation requires modernization of production and increase of the fuel heat utilization factor, therefore, reduction of specific fuel consumption for the production of heat and electricity. This paper analyzes the influence and practicability of introducing heat pumps into the heating circuit of the return water of the heat network of power units with PT-80 and T-250 turbines. Heat pumps of various configurations provide invariant energy conversion factor and efficiency. To assess energy and economic efficiency, modeling of the operation of power units and calculation of heat pump circuits for various refrigerants are performed. The economic effect is represented in quarterly cash savings of operating costs.

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Section: Resultsmentioning

confidence: 99%

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

et al. 2019

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“…The water strategy of the Russian Federation for the period until 2020 [3][4][5][6][7][8][9][10][11][12] means improving the rationality of the use of water resources. Main aim way to achieve this goal is to reduce water losses during transportation, to decrease specific water consumption in technological processes through the use of more efficient production technologies and to make consumption for household needs less [13][14][15][16][17][18]. The energy sector spends most of the water used in the country by industry (see Fig.…”

Section: Introductionmentioning

confidence: 99%

The potential for reducing TPP water consumption through the use of heat pumps

et al. 2019

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Largest part of consumed water resources in Russian Federation is related to energy sector; accordingly, we need to develop measures to ensure their rational use. This paper analyzes the potential for reducing water consumption of thermal power plants by applying heat pumps in the condenser cooling system of a steam turbine plant. The calculations were performed for two CCGT-450 power units with three main options for technical water supply systems. The greatest environmental and economic effects are provided by the use of heat pumps at TPPs with a once-through water supply system. Utilization of all low-grade heat of the condenser cooling system of a steam turbine plant is irrational due to an increase in energy consumption for TPP own needs. With a further growth of tax rates for water intake from surface water bodies, positive effect of application of heat pumps in the condenser cooling system of a steam turbine plant will increase by an order of magnitude.

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“…Many efforts have been focused on discovering suitable materials with high hydrogen storage capacities to meet the requirements of commercial vehicles powered by proton exchange membrane fuel cells. − Complex light metal hydrides are interesting materials for mobile hydrogen storage because of their high gravimetric and volumetric hydrogen densities. − For example, LiBH 4 contains 18.5 wt % H. − However, the slow dehydriding kinetics and high dissociation temperature of LiBH 4 currently limit its practical applications. , Consequently, many strategies have been employed to improve the dynamic and kinetic properties of LiBH 4 in the last decade.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH₄: A First-Principles Study

Huang

Wang

et al. 2018

J. Phys. Chem. C

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A metal + nonmetal (Mg + N) partial cosubstitution method for improving the dehydrogenation properties of lithium borohydride (LiBH4), which is a potential solid hydrogen storage material, is proposed. A detailed analysis of the electronic structure, charge density redistribution, and dehydrogenation properties reveals that the cosubstitution has a more positive effect on several properties, including the thermal stability, hydrogen dissociation energy, and dehydrogenation temperature, than the single substitution of Mg or N. When Mg and N are codoped into LiBH4, its formation enthalpy increases from −0.332 to −0.293 eV·atom–1 and its thermal stability decreases. Moreover, density functional theory calculations of the Mg + N cosubstituted system show that its hydrogen dissociation energy is the lowest and the onset dehydrogenation temperature is reduced to 160.5 °C, indicating that Mg + N cosubstitution can significantly promote the dehydrogenation thermodynamic performance of LiBH4 materials.

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Numerical and experimental study of La–Ni hydriding kinetics based on the varying-size model

Cited by 17 publications

References 31 publications

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

The potential for reducing TPP water consumption through the use of heat pumps

Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH₄: A First-Principles Study

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Numerical and experimental study of La–Ni hydriding kinetics based on the varying-size model

Cited by 17 publications

References 31 publications

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

Efficiency of using heat pumps with various refrigerants in real steam turbine power units with PT-80 and T-250 turbines

The potential for reducing TPP water consumption through the use of heat pumps

Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH4: A First-Principles Study

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Resources

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Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH₄: A First-Principles Study