10 results about "Hydrogen cycle" patented technology

The hydrogen recycling unit recovers hydrogen from the generator via a hydrogen recovery pipeline and stores it in the first storage tank. The hydrogen stored in the first storage tank is compressed by a compressor and stored in the second storage tank. The hydrogen stored in the second storage tank is supplied to the generator via a hydrogen supply pipeline.

This invention relates to the field of hydrogen storage technology and discloses a micro / nano spherical CoMn2O4 hydrogen storage material catalyst. The catalyst is characterized by: dissolving cobalt and manganese sources in an ethylene glycol solution at a molar ratio of 1:2 to 2.5; adding urea and glucose and stirring until homogeneous to obtain a mixed solution; subjecting the mixture to a hydrothermal reaction at 180-220°C; centrifuging, washing, and drying to obtain a powder; and finally heating the powder in a muffle furnace at 450-850°C until oxidation is complete. The molar ratio of ethylene glycol, urea, glucose, and cobalt source is 140-150:9-11:0.2-0.3:1. When this catalyst is combined with magnesium hydride, the dehydrogenation capacity reaches 6.04 wt.% within 9 minutes at 300°C, and the hydrogen absorption capacity is 5.01 wt.% within 3 minutes at 150°C. In comparison, even with ball milling of MgH2 for 20 minutes, the hydrogen absorption capacity only reaches 4.55 wt.%. Furthermore, the composite material exhibits a high cycle life: after 100 hydrogen adsorption / desorption cycles at 300°C, the hydrogen storage capacity shows no significant change, with a capacity retention rate of 99.95%. The catalyst preparation method is simple, and the raw materials are readily available, making it suitable for large-scale production.

This invention discloses a nitrogen-doped two-dimensional layered material supported on cobalt hydrogen storage catalyst, a hydrogen storage material containing the catalyst, and a preparation method thereof, belonging to the field of hydrogen storage technology. The hydrogen storage catalyst is an N-doped Ti3C2T catalyst. x MXene-supported Co, when combined with magnesium hydride, exhibits excellent catalytic performance: in terms of hydrogen desorption kinetics, MgH2-N-doped Ti3C2T... x The MXene-supported Co composite hydrogen storage material exhibited a hydrogen dehydrogenation rate of 6.50 wt.% within 12 minutes at 300℃; when the dehydrogenation temperature decreased to 260℃, the composite hydrogen storage material released 6.01 wt.% hydrogen within 50 minutes. Furthermore, the initial hydrogen release temperature of this composite hydrogen storage material was 110.8℃ lower than that of pure MgH2. Regarding hydrogen absorption kinetics, MgH2-N doped Ti3C2T... x The MXene-supported Co composite hydrogen storage material exhibited a hydrogen absorption capacity of 6.14 wt.% at 150 °C for 30 min. Additionally, the MgH₂-N-doped Ti₃C₂T₅... x The MXene-supported Co composite hydrogen storage material exhibits a high cycle life, retaining 95.38% of its capacity after 50 hydrogen adsorption / desorption cycles. The catalyst is simple to prepare, and the raw materials are readily available, making it suitable for large-scale production.

The application discloses a hydrogen liquefaction system adopting cascade refrigeration and a separated continuous converter, and belongs to the technical field of refrigeration and cryogenics. The system comprises a normal-pressure precooling cold box, a vacuum deep cooling cold box, a low-temperature adsorber, a compressor set and an expander set. Propylene / carbon dioxide cascade refrigeration is adopted in the precooling section to assist nitrogen cycle refrigeration, and improved double-pressure hydrogen cycle refrigeration is adopted in the deep cooling section. After being cooled by a plurality of heat exchangers and throttled by a terminal throttle valve, raw hydrogen is liquefied. In the product hydrogen passage of the plate-fin heat exchanger in the vacuum deep cooling cold box, normal and secondary hydrogen conversion catalysts are filled and separated from the main heat exchanger, so that the content of secondary hydrogen in the liquid hydrogen product is not less than 98%, 13-25 tons of liquefied hydrogen can be produced per day, and the specific energy consumption of the system is not more than 9.5 kWh / kg of liquid hydrogen. The hydrogen liquefaction system has low energy consumption, the precooling cold box and the deep cooling cold box adopt different design schemes, the continuous converter is separated from the main heat exchanger, and the operation cost, equipment cost and maintenance cost are reduced.

This invention relates to a circulating methanol purification system and process. The system includes at least one distillation-hydrogenation loop, which comprises a methanol distillation column and a hydrogenation reactor connected in a loop. The feed inlet of the hydrogenation reactor is connected to the top outlet of the methanol distillation column, and the feed inlet of the hydrogenation reactor is connected to a hydrogen source. The process includes the following steps: passing an aqueous methanol solution containing impurities into the methanol distillation column, removing impurities such as aldehydes and ketones from the top of the column; removing the concentrated impurities through the hydrogenation reactor, and returning the hydrogenation product to the methanol distillation column for fusel oil separation; collecting high-purity methanol from the side stream of the methanol distillation column, further removing remaining trace impurities, especially aldehydes, through an ion exchanger; the purified methanol can be recycled. Using the purification process of this invention, impurities in the circulating methanol are concentrated, the process is simple with low investment, the impurity conversion rate is high, the service life of the epoxidation catalyst can be significantly extended, and product quality can be improved.

This invention discloses a method and apparatus for calculating carbon deposition in an H-C-O system, relating to the fields of thermodynamic modeling of metallurgical processes and gas reaction engineering technology. It achieves accurate and efficient calculation of carbon deposition in H-C-O systems. The method includes: obtaining the gas-phase conversion reaction and carbon deposition reaction of an H-C-O system constructed from a hydrogen-rich circulating gas system; determining independent reaction groups based on the evaluation function value of the carbon deposition reaction and the gas-phase conversion reaction; calculating the pre-equilibrium moles of substances at an initial temperature point based on the initial mole number of gases in the hydrogen-rich circulating gas system and the reaction amounts of the independent reactions; calculating the equilibrium moles of the corresponding substances at the initial temperature point based on the Gibbs free energy minimum method; using the equilibrium moles of each substance at the previous temperature point as the initial value for the corresponding substance at the current temperature point; calculating the equilibrium moles of each substance at the current temperature point; and so on, until the current temperature point is the final temperature point. The substances include gaseous and solid carbon.

This invention discloses a gas turbine self-blending hydrogen cycle power generation system and method based on chemical regeneration, including a compressor, combustion chamber, turbine, generator, methane diversion valve, steam generator, preheater, reforming reactor, condenser, gas-liquid separator, hydrogen membrane separator, hydrogen storage tank, and hydrogen blending control valve. Through hydrogen membrane separation, hydrogen storage buffering, and precise control of the hydrogen blending ratio, the actual hydrogen content in the combustion chamber is actively adjusted to a safe range, fundamentally eliminating the risks of backfire and combustion oscillation, and ensuring long-term stable operation of the system. Secondly, by condensing, separating, and recirculating unreacted water vapor from the syngas to the reforming reactor, the water-to-carbon ratio is significantly improved, enhancing the methane reforming conversion efficiency under medium- and low-temperature flue gas heating conditions. Finally, the aforementioned water recirculation mechanism forms a closed loop of water resources within the system, significantly reducing dependence on external water replenishment and achieving synergistic and efficient utilization of energy and resources.

This invention relates to an MXene hydrogen storage catalyst, a hydrogen storage material containing the catalyst, and a preparation method thereof, belonging to the field of hydrogen storage technology. The MXene hydrogen storage catalyst has a surface functional group density of 25–39 at.%, which not only facilitates the adsorption and dissociation of hydrogen molecules by the transition metal in MXene but also promotes the diffusion of hydrogen atoms, achieving a good match between the hydrogen dissociation and diffusion processes. This catalyst exhibits higher catalytic activity and has significant advantages in improving the performance of magnesium-based hydrogen storage. When combined with MgH2, the composite hydrogen storage material releases 6.10 wt.% hydrogen within 4 minutes at 280°C and absorbs 5.26 wt.% hydrogen within 60 seconds at 100°C. Furthermore, after 50 hydrogen absorption / desorption cycles, the composite hydrogen storage material still retains a hydrogen storage capacity of over 4.8 wt.%. The catalyst exhibits good stability, a simple preparation process, and readily available raw materials, making it suitable for large-scale production.

This application relates to the field of development and application technology of metal hydrogen storage materials, and provides a system for producing liquid hydrogen and liquid oxygen using metal hydrogen storage materials, including a hydrogen absorption / desorption cycle unit, a helium circulation unit, and a liquid hydrogen / liquid oxygen preparation unit. The system for producing liquid hydrogen and liquid oxygen using metal hydrogen storage materials provided in this application utilizes the low temperature generated during the hydrogen absorption / desorption cycle of the metal hydrogen storage material to achieve air separation and hydrogen liquefaction. It fully utilizes natural energy, including solar energy, and the chemical energy of hydrogen absorption / desorption by the metal hydrogen storage material. It effectively utilizes the heat generated by hydrogen absorption and the cold energy generated by hydrogen desorption, achieving efficient utilization of hydrogen energy.