8 results about "Hydrogen density" patented technology

This invention discloses a high-hydrogen-density liquid organic hydrogen carrier and its applications, belonging to the field of hydrogen energy storage and utilization technology. The liquid organic hydrogen carrier is a composite system of a functionalized nitrogen-containing heterocyclic compound and a metal-organic framework material supported on a non-precious metal catalyst. The nitrogen-containing heterocyclic framework is connected with electron-donating and electron-withdrawing groups, constructing an intramolecular electron push-pull system. The non-precious metal catalyst is supported inside the pores or on the surface of the metal-organic framework material. Through molecular structure design and catalyst system optimization, this invention achieves a hydrogen storage density of not less than 7.0 wt%, a dehydrogenation onset temperature of not more than 150℃, and a dehydrogenated hydrogen purity of not less than 99.99%, with excellent cycle stability and low catalyst cost. This liquid organic hydrogen carrier can be widely used in renewable energy storage, long-distance hydrogen transportation, vehicle-mounted hydrogen sources, and distributed energy supply systems.

The invention discloses a supercritical hydrogen energy storage system which comprises a supercritical hydrogen storage bottle and a liquid nitrogen tank, the liquid nitrogen tank is composed of an inner barrel and an outer barrel, the inner barrel is installed in the outer barrel, a vacuum interlayer is arranged between the inner barrel and the outer barrel, liquid nitrogen is stored in the inner barrel, the supercritical hydrogen storage bottle is installed in the inner barrel through a supporting structure, and the supercritical hydrogen storage bottle is installed in the outer barrel through the supporting structure. And a gap is reserved between the supercritical hydrogen storage bottle and the inner barrel. According to the supercritical hydrogen energy storage system, the supercritical hydrogen storage bottle is soaked in liquid nitrogen, a stable low-temperature environment is formed through liquid nitrogen soaking, heat invasion is effectively restrained, and the evaporation rate of hydrogen approaches zero under static storage. The temperature of the liquid nitrogen is-196 DEG C, the temperature of the liquid hydrogen is-253 DEG C, the energy consumption of refrigerating to-196 DEG C is far lower than that of liquefying to-253 DEG C, and the liquid nitrogen is low in cost and easy to obtain; under the composite storage condition of 70MPa and-196 DEG C, the hydrogen can be easily maintained in a supercritical state, and the hydrogen density can exceed 70kg / m, is superior to normal-temperature high-pressure gaseous hydrogen storage, and reaches or exceeds the normal-pressure liquid hydrogen level.

A sensitive detection device for hydrogen leakage of a hydrogen-containing medium pipeline flange comprises a pinnacle gas-collecting hood arranged right above the pipeline flange, and the inner wall of the pinnacle gas-collecting hood forms a flow guide space converging towards the top and is used for collecting hydrogen leaked from the pipeline flange and guiding the hydrogen to the top; the hydrogen detection sensor mounted at the top detects the hydrogen concentration of the collected gas in real time; the discharge pipeline is communicated with the pinnacle gas-collecting hood, and the detected gas is safely discharged to avoid local accumulation; the control system is electrically connected with the sensor through a cable and receives concentration signals in real time. According to the device, leaked gas is naturally converged through the pinnacle gas collection structure by using hydrogen density difference, the gas concentration of a sensor detection area is improved, the gas is safely discharged through a discharge pipeline after being detected by a sensor, and a control system can quickly give an early warning when the hydrogen concentration exceeds a threshold value. The device solves the problem of insufficient hydrogen detection sensitivity in an open environment, has the advantages of simple structure, quick response, safety and reliability, is suitable for hydrogen leakage monitoring in industrial fields such as synthesis ammonia and the like, and effectively guarantees the production safety.

The application discloses a hydrogenation and dehydrogenation system and a control method thereof, wherein the hydrogenation and dehydrogenation system comprises a hydrogen / oil combination chamber, a hydrogen oil tank, a reaction chamber, a hydrogen purification chamber, a purification chamber, an impurity storage chamber and a hydrogen-using equipment; wherein the power P of the hydrogen-using equipment and the hydrogen oil liquid level height h in the reaction chamber have the following relationship: h=Pt / (ρS*Wt%*ηQ), wherein ρ is the hydrogen density, S is the cross-sectional area of the reaction chamber, Wt% is the mass ratio of hydrogen to hydrogen oil in the hydrogen oil mixture, η is the effective conversion efficiency of hydrogen, Q is the heat value of hydrogen, and t is the time for hydrogen flowing from the reaction chamber to the hydrogen-using equipment. The application purifies hydrogen oil and hydrogen generated by storage, improves hydrogenation and hydrogen utilization efficiency, adjusts the actual height of the hydrogen oil liquid level in the reaction chamber according to the mathematical relationship between the hydrogen-using equipment power and the hydrogen oil liquid level height in the reaction chamber, and realizes automatic adjustment of the hydrogen-using equipment power and the hydrogen oil amount in the reaction chamber of the hydrogenation and dehydrogenation system.

This invention relates to a method and system for calculating and compensating the State of Charge (SOC) of a hydrogen storage system. The invention includes: real-time acquisition of the pressure and temperature of hydrogen gas within the storage container; correction of the pressure based on the pressure and temperature to obtain a standard pressure at 20°C; calculation of the initial SOC value using the pressure-temperature method based on the 20°C standard pressure; acquisition of the heat transfer coefficient, heat exchange area, real-time hydrogen storage mass, and hydrogen specific heat capacity at constant pressure within the storage container, and calculation of a thermal effect compensation coefficient based on the pressure change rate and temperature change rate; thermal effect compensation of the initial SOC value based on the thermal effect compensation coefficient to obtain a thermally compensated SOC value; correction of the hydrogen density based on the second virial coefficient of hydrogen, the real-time absolute pressure within the storage cylinder, and the real-time thermodynamic temperature to obtain a density correction coefficient; and correction of the thermally compensated SOC value based on the density correction coefficient to obtain the final SOC value. This invention improves the accuracy and stability of SOC calculation for hydrogen storage systems.

The application discloses a hydrogen and electricity system with multiple solid-state hydrogen storage materials coupling for super-high quality hydrogen storage density, and belongs to the technical field of hydrogen and electricity. The hydrogen and electricity system comprises a solid-state hydrogen storage system, a fuel cell stack and a modular solid-state hydrogen storage unit which are arranged in the solid-state hydrogen storage system, the modular solid-state hydrogen storage unit comprises a first hydrogen storage unit (a solid-state hydrogen storage material pyrolysis unit) and a second hydrogen storage unit (a solid-state hydrogen storage material hydrolysis unit) which are arranged in the first hydrogen storage unit; hydrogen outlets of the first hydrogen storage unit and the second hydrogen storage unit are connected to a hydrogen inlet of the fuel cell stack through a pipeline and a third hydrogen storage unit; and an anode tail gas outlet of the fuel cell stack is connected to a water inlet of the second hydrogen storage unit through a pipeline. The application adopts a coupling method to realize integrated design of hydrogen production by pyrolysis of solid-state hydrogen storage material, hydrogen production by hydrolysis and a fuel cell power generation system, realizes efficient utilization and release of water, heat and electricity, and realizes a hydrogen and electricity system solution with super-high energy density.

The application belongs to the technical field of hydrogen energy, and particularly relates to a hydrogen supply system applied to a hydrogen refueling station, comprising: a cascade buffer storage system, comprising at least one cascade buffer storage tank and a hydrogen refueling machine corresponding to the cascade buffer storage tank; and an upstream gaseous hydrogen supply link and a liquid hydrogen supply link. The capacity of the cascade buffer storage tank is calculated according to the hydrogen density at the maximum and minimum pressures obtained by fitting a non-ideal gas model according to a preset maximum hydrogen refueling demand amount for a single time; and the compressor in the gaseous hydrogen supply link and the vaporizer in the liquid hydrogen supply link are both calculated according to the equivalent hydrogen peak flow calculated according to the preset maximum hydrogen refueling demand amount for a single time. The application effectively improves the hydrogen supply stability, equipment utilization rate and operation economy of the hydrogen refueling station in multiple scenarios by constructing a redundant architecture for parallel supply of gaseous hydrogen and liquid hydrogen and reasonably configuring the key components.

The utility model relates to the technical field of solid hydrogen storage and transportation, in particular to a magnesium-based metal solid hydrogen storage device. In order to solve the technical problems in the prior art, the utility model provides a magnesium-based metal solid hydrogen storage device which is high in mass hydrogen storage density, large in hydrogen storage capacity, high in heat exchange efficiency and good in safety. The hydrogen storage device comprises a tank body and a hydrogen supply pipe, wherein one end of the hydrogen supply pipe is inserted into the tank body, a hole is formed in the pipe wall, and the other end of the hydrogen supply pipe extends out of the tank body; a plurality of U-shaped heat exchange tubes are arranged in the tank body, the vertical parts of all the U-shaped heat exchange tubes are uniformly distributed at intervals in the circumferential direction, the central points of the horizontal parts are located on the axis of the tank body, and two ports of each U-shaped heat exchange tube extend out of the tank body; the U-shaped heat exchange tube is used for adjusting the temperature in the tank body; a plurality of layers of heat exchange fin groups are distributed in the tank body along the axis direction; magnesium-based hydrogen storage alloy is filled in the tank body to serve as a solid hydrogen storage material.