Study On Conceptual Design And Thermal Management Of Coupling Hydrogen Energy Storage In Hydropower Station

Energy security is related to the national economic and social overall situation and strategy,and the global energy pattern is developing towards clean and efficient energy.Clean and renewable energy is becoming an important force in the China's energy supply structure reform.The issue of photovoltaic curtailment,wind curtailment,and water curtailment?three curtailments?has become increasingly prominent.The loss of disposed water and electricity from hydropower stations has reached trillions.Energy storage technology breakthroughs have led global disruption performance source pattern adjustment.The large-scale energy storage coupled power station can solve the issue of"three curtailments",hydrogen energy storage has high density and no pollution.This paper proposes the innovative hydropower station coupled hydrogen energy storage energy system to break through the issue of disposed water consumption,studies the conceptual design of the hydropower station coupled hydropower generation Mg-based solid hydrogen energy storage system,proposes the concept of a coupled hydropower-hydrogen energy storage energy system,and constructs a coupled energy system evaluation methods:it studies the thermal management of the key solid-state energy storage system in the coupled system,design the structure of the solid-state hydrogen storage device,and provide new ideas and technologies for the disposal of disposed water in hydropower stations.Conceptual design of coupled hydrogen energy storage system for hydropower station disposed water power generation.This paper studies the hydropower generation system.This paper studies the hydropower station power generation system.It superimposes the hydrogen energy storage system,and proposes the concept of coupled hydrogen energy storage energy system for hydro power generation disposed hydropower generation,AC/DC conversion subsystem and regulation control system.It studies and designs the working mechanism of the coupled energy system,studies the design model of the coupled energy subsystem components.Based on the characteristics of disposed water in the hydropower station,this paper constructs the coupled disposed water power generation with different capacity configurations.The structure model of the hydrogen energy storage power system is proposed,and the system energy scheduling optimization strategy taking into account the hydrogen energy storage is proposed.The performance evaluation index of the coupled energy system is studied and designed,and the evaluation index calculation method is constructed.Taking the system power constraints,technical constraints and economic constraints as constrained conditions,combined with a multi-faceted and executable benefit evaluation system,a multi-objective collaborative optimization evaluation calculation method is proposed.Research on thermal management system of high-density solid-state hydrogen storage device.The key for the coupled energy system is the hydrogen energy storage system.In order to meet the high operating temperature requirements of the high-density solid-state hydrogen storage device,a thermal management system for the solid-state hydrogen storage device has not been constructed this year,and the H₂ process constraints for the solid-state hydrogen storage device have been considered.Under the conditions,a related mathematical model is established,and the thermal management performance of the working process of the hydrogen absorption and release characteristics of the solid-state hydrogen storage device is analyzed to ensure that the heat exchange system is safe,reliable,and efficient.In this paper,based on the finite element method numerical simulation,the influence of hydrogen storage temperature on Mg-based solid hydrogen storage materials is studied.It is found that due to the thermal conductivity of the hydrogen storage materials,the reaction rate at the site far from the heat exchange fluid zone is slow and discontinuous,and the reaction rate near the heat exchange fluid zone is fast and sustainable.During the hydrogen release process,with the release of high-pressure hydrogen,the ambient pressure drops below the equilibrium hydrogen pressure,the hydrogen storage material begins to react and evolve hydrogen,and the initial bed temperature and reaction driving force have a certain effect on the hydrogen release performance.As the temperature rises,the temperature of the bed body increases rapidly after experiencing a sudden decline and can quickly return to the initial value.The reaction rate is significantly increased and the hydrogen release cycle is significantly shortened.Increasing the reaction driving force can increase the reaction rate to a certain extent.As the hydrogen content of the hydrogen storage device decreases,the reaction driving force has little effect on the reaction.Design and performance test and optimization of hydrogen storage heat exchange device.This paper has designed a three-dimensional model with embedded multi-U tube bundle heat transfer structure with light weight and high operability.In terms of heat and mass transfer:given the effective thermal conductivity and hydrogen permeability of the hydrogen storage material bed,the heat transfer behavior of the bed has a significant effect on the hydrogen release performance.With the increase of the effective thermal conductivity,the hydrogen release rate significantly increases,and the hydrogen release cycle is shortened significantly.The mass transfer behavior of the bed has little effect on the hydrogen release performance,and the reaction rate does not increase significantly.In terms of structural parameter design:increasing the heat exchange strength between the hydrogen storage material and the external heat exchange fluid can increase the heat exchange between the bed and the outside,enhance the heat transfer performance of the bed,and increase the hydrogen release rate.As the heat transfer intensity is further increased,the effect of the reaction decreases.Increasing the aspect ratio of the hydrogen storage device can shorten the radial interval of the bed body,increase the heat exchange area,reduce the temperature drop of the bed body,and shorten the hydrogen discharge cycle at a constant flow rate.The embedded fins of the hydrogen storage material bed can improve the uneven temperature distribution of the reaction temperature in bed,significantly enhance the heat transfer effect of the bed body away from the heat exchange fluid,and improve the overall hydrogen release rate.When the aspect ratio and the amounts of fins of the hydrogen storage device are further increased,the reaction effect is weakened,and at the same time,the hydrogen energy storage density is reduced.The above factors should be considered in the design of the aspect ratio and embedded fin parameters.