62 results about "Hydrogen pressure" patented technology

Method for controlling the operation of a fuel cell system, comprising the steps for: Diagnosing, by means of a control system, a water shortage condition in a fuel cell stack based on a decrease in cooling capacity and a deterioration of the fuel cell stack; Determine, by controlling, a diagnostic level of the fuel cell system based on the diagnosed water shortage state of the fuel cell stack; and Performing, by controlling, a regenerative operation by selecting a regenerative operating mode that corresponds to the specified diagnostic level, wherein the regenerative operating mode comprises: a first regenerative operating mode to reduce an operating limit temperature of the fuel cell stack; a second regenerative operating mode to increase an air pressure at the cathode side of the fuel cell stack or to decrease a stoichiometric ratio of air; and a third regenerative operating mode to decrease a hydrogen gas pressure at an anode side of the fuel cell stack or to increase a stoichiometric ratio of hydrogen.

The utility model belongs to valve field, specifically speaking is a kind of hydrogen bottle mouth combination valve equipment including cylinder switch valve;The side of cylinder switch valve is fixed with pressure reducing valve, the side of pressure reducing valve is equipped with hydrogen filter, the side of hydrogen filter is equipped with gas flowmeter, the side of gas flowmeter is fixed with gas pipe, the end of gas pipe away from gas flowmeter is fixed with flange, when using, cylinder switch valve is installed on gas cylinder, it is used to control the switch of gas cylinder bleeds, cylinder switch valve is connected with pressure reducing valve, pressure reducing valve is used to hydrogen pressure reduction, then connected with gas flowmeter to determine the hydrogen amount of filling, rely on above-mentioned combination valve structure, so it can be filled with hydrogen conveniently, and improve the security of filling.

This invention discloses a rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy and its preparation method. The preparation method includes the following steps: mixing FeV80 with Ce and melting it in a vacuum arc melting furnace under an argon protective atmosphere; polishing the surface of the FeV80-yCe master alloy to remove the surface-enriched impurity phases, obtaining a purified master alloy; mixing the purified master alloy with Ti, Zr, Mn, and Cr raw materials and arc melting it under vacuum conditions; after melting, cooling it to room temperature with the furnace to obtain the rare-earth Ce-purified Ti-Mn-based hydrogen storage alloy. This invention pre-treats FeV80 with Ce, and removes impurities enriched on the surface of the metal ingot through melting and then polishing. The process is simple and cost-controllable, fundamentally solving the problem of impurity deterioration in industrial raw materials, improving the hydrogen storage capacity of the hydrogen storage alloy at 5MPa hydrogen pressure, and meeting the comprehensive performance requirements for industrial applications.

This invention pertains to the field of hydrogen energy, specifically a high-carbon, low-hydrogen pressure swing adsorption (PSA) purification process system and method. The system, along the gas flow direction, sequentially includes a carbon-based conversion unit, a heat exchange-cooling-gas-liquid separation unit, a compressor, at least two switchable decarbonization and desulfurization towers, a fine desulfurization tower, a PSA unit, a desorbed gas buffer tank, a desorbed gas compressor, and a fuel gas tank. This invention increases the hydrogen fraction in the feed gas from 30-50% to 50-70% through carbon-based conversion, then removes total sulfur to ≤0.1ppm through multi-stage desulfurization and decarbonization, finally producing fuel cell-grade hydrogen with a purity of ≥99.97% via PSA. Simultaneously, the desorbed gas is pressurized, buffered, and then divided into two stages for reuse. This invention effectively improves hydrogen recovery rate and desorbed gas utilization rate, solving the problems of high energy consumption and adsorbent poisoning in the purification of high-carbon, low-hydrogen by-product gases. It is applicable to various feed gases such as coke oven gas, refinery gas, and methanol tail gas.

A system and method for liquefying a hydrogen gas feed stream uses a high-pressure hydrogen stream from a storage source to provide refrigeration to the system. After providing refrigeration to the system, the hydrogen from the high-pressure storage source is at a pressure not lower than the pressure of a cold box feed stream of the system, where the cold box feed stream includes the hydrogen gas feed stream and at least one recycle stream, and is not recycled back through the system but instead exits the system.

This application provides a method and system for optimizing the layout of hydrogen refueling networks based on big data, relating to the field of hydrogen refueling station planning technology. This application acquires the vehicle-end driving trajectory of hydrogen fuel cell vehicles, the hydrogen pressure reduction at the vehicle end, and the hydrogen production rate of local hydrogen production plants to calculate the node hydrogen consumption equivalent for each road segment node; performs road segment blocking operations on the physical road network according to hazardous chemical prohibition rules to generate a hydrogen transportation road network; takes the local hydrogen production plant as the starting node, performs capacity attenuation calculations outward along the hydrogen transportation road network based on the plant's hydrogen production rate, and outputs the node hydrogen supply equivalent for each road segment node; spatially superimposes and cancels the node hydrogen consumption equivalent with the node hydrogen supply equivalent, locks the target road segment node that meets the first preset condition, performs spatial correction, and outputs the station deployment coordinates. This invention can automatically generate hydrogen refueling station site selection coordinates based on the spatiotemporal matching relationship between actual vehicle-end hydrogen consumption and local hydrogen supply, improving the rationality and operational efficiency of the hydrogen refueling network layout.

The present application relates to a kind of three valve combined intelligent control method based on fuel cell membrane moisture content, it relates to fuel cell control technical field, for the unstable operation phenomenon caused by hydrogen pressure fluctuation, flow mismatch and membrane moisture content imbalance of fuel cell, specifically provide a kind of three valve combined intelligent control method based on fuel cell membrane moisture content, method includes: based on artificial neural network model, membrane moisture content is predicted and valve opening is corrected;Current hydrogen pressure fluctuation value in hydrogen discharge process of hydrogen system is obtained, and valve is again fine-tuned using PID control mode, realizes the self-adaptive regulation of system under all operating conditions and decoupling control under multiple outputs, finally achieves the purpose of hydrogen accurate supply and stack stable operation.

The present application relates to a kind of hydrogenation process fuel cell vehicle control method and system, belong to new energy technology field.Add hydrogen judgment logic is through the hydrogen pressure periodically collected by hydrogen system, the pressure rise rate in specific time period is calculated, and the residual hydrogen mass rise rate is calculated according to temperature and pressure by gas state equation, simultaneously satisfy the condition of exceeding pressure rise rate threshold and residual hydrogen mass rise rate threshold, and vehicle is at safe speed, judge vehicle is in hydrogenation state, and vehicle control is cut off high voltage electricity.Avoid setting independent sensor switch in hydrogenation hatch, reduce cost, while it can avoid the unexpected parking safety risk caused by hydrogenation hatch abnormal opening under the harsh operating condition of fuel cell heavy truck.

The utility model belongs to hydrogen fuel cell technical field especially relates to a hydrogen pressure reducing device with explosion -proof function. The utility model provides a hydrogen pressure reducing device with explosion -proof function, include: hydrogen delivery pipe, nitrogen delivery pipe, hydrogen pressure reducing valve, nitrogen pressure reducing valve, safety valve, nitrogen purging pipe, emptying pipe and multiple ball valves, pressure gauge and safety pipeline, through hydrogen pressure reducing valve and safety valve overpressure automatic pressure relief function, ensure that system pressure is stable, nitrogen purging pipe and emptying pipe constitute purging system, can remove residual hydrogen in pipeline, avoid the risk of explosion, each ball valve realizes gas source quick opening and closing control, and pressure gauge real -time monitoring pressure state, the device is equipped with check valve to prevent gas backflow, and filter guarantees that gas is pure. The utility model passes through multiple safety design, and the explosion -proof performance and operating safety are improved obviously.

This application discloses a safe and efficient hydrogen utilization system for chlor-alkali processes, including a main hydrogen pipeline connected to a hydrogen scrubbing tower, and a hydrogen water seal branch, a boiler hydrogen supply branch, and a hydrogen pressure regulating branch connected in parallel to its output end. The boiler hydrogen supply branch is equipped with a hydrogen cooler and a shut-off valve and flow regulating valve assembly including a bypass pipeline; the hydrogen pressure regulating branch is equipped with a hydrogen regulating valve leading to a hydrogen vent. The nitrogen replacement unit includes a main nitrogen pipeline and branch pipelines, each equipped with shut-off valves, check valves, etc., for nitrogen purging during start-up, shutdown, and emergency conditions. The system offers significant advantages: the addition of a hydrogen cooler stabilizes hydrogen temperature and flow; the addition of a bypass valve and flow meter to the flow regulating valve assembly allows for precise regulation and eliminates hydrogen venting waste; the well-designed nitrogen replacement unit and safety interlock mechanism eliminate the risk of explosion. This system effectively improves the safety and efficiency of hydrogen utilization.

The application of prediction method for diffusion behavior of underground hydrogen in pore scale of water-containing clay mineral belongs to the technical field of underground hydrogen energy storage and unconventional gas migration prediction, and the key point is to fill water molecules and salt ions into the pores according to the target water saturation and salinity; the initial model of the water-containing clay mineral pores is pre-equilibrated by the molecular dynamics method; hydrogen molecules are filled under the given temperature and pressure conditions by the grand canonical Monte Carlo method, and the hydrogen pressure is corrected by the SRK-EOS state equation; the hydrogen diffusion simulation is carried out by the molecular dynamics method with temperature and fugacity as input parameters, the mean square displacement of hydrogen in the pores is calculated, and the self-diffusion coefficient is obtained; the application can quantitatively characterize the diffusion rate change rule of hydrogen in the clay pores under different water film thickness, salinity and temperature and pressure conditions, and reveal the diffusion inflection point, diffusion inhibition stage and migration restriction mechanism caused by the water film or water bridge structure.

This invention discloses a pressurized heat exchange hydrogen supply device and method for a solid-state hydrogen storage system, relating to the field of solid-state hydrogen storage technology. The device includes: a filter for filtering hydrogen output from the solid-state hydrogen storage system; a first hydrogen booster for increasing hydrogen pressure to a target range; a first heat exchanger for reducing the pressurized hydrogen to a preset temperature range; a regulating valve for regulating hydrogen flow rate; and a pressure transmitter, temperature transmitter, and flow meter for measuring hydrogen pressure, temperature, and flow rate, respectively. A PLC dynamically adjusts the operating status of the first hydrogen booster, the opening of the regulating valve, and controls the start and stop of the first heat exchanger. This invention integrates the pretreatment unit, the pressurized heat exchange unit, and the flow regulation unit into a single unit. It employs an automatic control system with a PLC controller at its core, combining the real-time acquisition of outlet parameters by the temperature transmitter, pressure transmitter, and flow meter to dynamically adjust the opening of the flow regulating valve, achieving constant control of the output pressure or flow rate.

This invention discloses a mobile hydrogen booster device, comprising: a chassis; a two-stage booster pump; a hydrogen output module for connecting to a gas cylinder; a hydrogen module including a hydrogen interface, a hydrogen inlet pipe, and a hydrogen outlet pipe; and a compressed air module including a compressed air interface, a compressed air inlet pipe, and a compressed air outlet pipe. The compressed air inlet pipe includes a compressed air three-way valve and a pneumatically controlled three-way valve. A pilot air check valve, a pilot air pressure reducing valve, a pilot air three-way valve, and a pilot valve are sequentially arranged on the first pipe, with the pilot valve connected to the front end of the hydrogen output module. A compressed air pressure reducing valve and a compressed air speed regulating valve are sequentially arranged on the second pipe. This invention, by setting up a multi-functional compressed air module, automatically controls the pilot valve to open when the pressure in the hydrogen outlet pipe reaches the rated pressure, cutting off the flow of driving air into the two-stage booster pump, thus achieving automatic gas supply cut-off. This results in a high degree of automation and high safety.

The utility model discloses a kind of hydrogen pressure regulating station, it is related to hydrogen pressure regulating technical field, including hydrogen pressure regulating pipeline, monitoring system, nitrogen purging system and explosion-proof wall, purging interface and purging replacement diffusion port are provided on hydrogen pressure regulating pipeline, nitrogen purging system and the purging interface of each hydrogen pressure regulating pipeline are communicated, and for when accident occurs, corresponding hydrogen pressure regulating pipeline is inhaled into nitrogen and carries out gas replacement in hydrogen pressure regulating pipeline, improve the security of production, while hydrogen and nitrogen mixture in hydrogen pressure regulating pipeline can be diffused to outside through the purging replacement diffusion port described above.When multiple hydrogen pressure regulating pipeline all appear accident, nitrogen purging system can simultaneously blow gas in each hydrogen pressure regulating pipeline.Hydrogen pressure regulating pipeline is arranged in explosion-proof wall, to protect hydrogen pressure regulating pipeline by explosion-proof wall, and effectively prevent the explosion combustion of hydrogen pressure regulating pipeline and the like from affecting outside, improve the security of hydrogen pressure regulating process.

This invention belongs to the field of pharmaceutical preparation technology and discloses a method for the continuous flow reaction synthesis of nebivolol hydrochloride. The method includes the following steps: filling a packed bed with a catalyst; introducing hydrogen gas into a continuous flow fixed-bed reactor; adding an N-benzylnebivolol hydrochloride solution to carry out a hydrogenation reaction; collecting the hydrogenation solution after the reaction is completed; and obtaining nebivolol hydrochloride through post-processing. This invention achieves the continuous and efficient preparation of nebivolol hydrochloride by controlling the catalyst feed ratio, hydrogen pressure, reaction residence time, and reaction temperature. The synthesis method employed allows for continuous material feeding and reaction, with short reaction time, mild conditions, few side reactions, and high conversion rate.

The present invention relates to methods and compositions for preparing amines. In particular, methods for preparing diamines comprising the step of: (a) contacting a nitrile compound having the formula (I) with an amine compound having the formula RdHN-Rc in the presence of a metal catalyst under a hydrogen pressure. (I)

The application discloses a method for preparing aromatic amine compounds by in-situ generating iridium catalyst to reduce nitro, and belongs to the technical field of chemical synthesis. The method is that aromatic nitro compounds, soluble iridium salt precursors and a solvent are placed in a reaction container, hydrogen is replaced after stirring reaction under the conditions of 60 atm hydrogen pressure and 25-50 DEG C for 24-48 hours, and the aromatic amine compounds are separated after reaction is completed; the molar ratio of iridium element in the soluble iridium salt precursors to the aromatic nitro compounds is 1:1000-100000. The method adopts a one-pot feeding method, generates high-activity heterogeneous iridium particle catalyst in-situ in the reaction system by using the soluble iridium salt precursors, and simultaneously completes hydrogenation reduction of the nitro. The method simplifies the process, reduces the cost, optimizes the post-treatment mode, and the in-situ generated catalyst has high activity, good selectivity, can be used repeatedly, and the noble metal catalyst is convenient to recycle.

The application relates to a hydrogen fuel cell system sealing performance calculation method, which comprises the following steps: firstly, recording a current t0 moment when a fuel cell stack temperature is in a target temperature range, a fuel cell stack membrane electrode wet state is in a target wet state range, and a hydrogen gas pressure value of a hydrogen gas supply manifold inlet of a hydrogen gas cavity of the fuel cell stack reaches a target hydrogen gas pressure value; recording a t1 moment after t time; and recording hydrogen gas pressure PLPH, air pressure PLPA and fuel cell stack temperature TSK of the t0 and t1 moments; calculating gas molar total amount, fuel cell stack gas consumption total amount and fuel cell stack sealing performance indexes of the t0 and t1 moments. Compared with the prior art, the application can improve the calculation precision of the fuel cell stack sealing performance and improve the evaluation precision of the fuel cell stack durability.

The application provides a palladium-cobalt bimetallic catalyst, a preparation method thereof and application thereof in a water-phase hydrogenation reaction, and belongs to the technical field of catalytic synthesis of gamma-butyrolactone. The preparation method comprises the following steps: (1) dissolving a Pd precursor, a Co precursor and an organic ligand citric acid in water to form a metal-citric acid complex, and then obtaining a gel through heating and stirring; (2) drying and grinding the gel, and then performing calcination under an air atmosphere to obtain a Pd / CoO x sample; (3) dispersing the Pd / CoO x sample into an aqueous citric acid solution, evaporating water through heating and stirring, obtaining a solid sample, and then performing drying, grinding, annealing and reduction to obtain the palladium-cobalt bimetallic catalyst. The application fully utilizes non-noble metals to effectively reduce the cost, ensure the stability of the catalyst, improve the activity of the catalyst and the selectivity of gamma-butyrolactone, and the catalyst preparation method is simple, gamma-butyrolactone can be prepared from succinic acid in a water phase under a lower hydrogen pressure, and the yield is up to 83.9%.

This invention relates to a Ti-Fe-Ce-Mn-Zr-Al-Co based hydrogen storage alloy and its preparation method, belonging to the technical field of hydrogen storage alloy materials. It solves at least one of the problems of high activation conditions, long activation cycles, and poor hydrogen absorption / desorption performance in existing TiFe hydrogen storage alloys. This invention provides a Ti-Fe-Ce-Mn-Zr-Al-Co based hydrogen storage alloy, characterized in that: the alloy's specific composition is Ti... 1.05 Ce 0.05 Fe 1.15‑x‑y‑z‑m Mn x Zr y Al z Co m Where x, y, z, and m are atomic ratios, and 0.1≤x≤0.25, 0.05≤y≤0.2, 0.02≤z≤0.1, 0.02≤m≤0.1. The hydrogen storage alloy exhibits excellent activation and hydrogen absorption / desorption properties, with a hydrogen storage capacity ≥1.70 wt.%, a hydrogen absorption plateau pressure ≥0.41 MPa, and a hydrogen desorption plateau pressure ≥0.31 MPa. It can be activated in a single step at 30°C and an initial hydrogen pressure of 3 MPa, making it suitable for widespread application as a solid-state hydrogen storage material in hydrogen fuel cells and other scenarios.

A procedure for verifying a communication link between a motor vehicle (1) and a hydrogen refueling station (8) is specified, comprising the steps: I) Establishment of the communication link between the motor vehicle (1) and the hydrogen filling station (8); II) Starting a refueling process, wherein starting the refueling process includes a hydrogen pressure surge and hydrogen refueling with increasing pressure; III) Measurement of the pressure and / or temperature in a hydrogen tank (2) or refueling line (2A) of the motor vehicle (1) as a result of the hydrogen pressure surge or hydrogen refueling; IV) Determining a correct communication link if the measurement of pressure and / or temperature shows a plausible increase in pressure and / or temperature as a result of the hydrogen pressure surge or hydrogen refueling, or determining a faulty communication link if the measurement does not show a plausible increase in pressure and / or temperature.

The application provides a method for preparing adamantane, which comprises: isomerizing tetrahydrodicyclopentadiene in the presence of a mesoporous mordenite molecular sieve catalyst with acid sites established by an organic acid, in the presence of an optional organic solvent, and in a hydrogen-containing atmosphere; and calculating the NH3-TPD peak area of the catalyst by integration, wherein the peak area of the weak acid center of the catalyst is greater than or equal to 330, the peak area of the strong acid center of the catalyst is less than or equal to 282, and the specific surface area of the catalyst is greater than or equal to 300 m 2 / g. In the synthesis of adamantane by the method, the isomerization reaction of adamantane is carried out in the presence of the above catalyst, at a reaction temperature of 250 DEG C, a hydrogen pressure of 1 Mpa, and in a 100-ml stainless steel autoclave. The product composition is analyzed by gas chromatography, and the chromatographic column is an HP-5 capillary column with a column length of 30 m. The purity of adamantane can reach more than 99%.

This invention discloses a method for the selective hydrogenation of 2,5-dimethyl-3-hexyn-2,5-diol to prepare 2,5-dimethyl-2,5-hexanediol, comprising: using 2,5-dimethyl-3-hexyn-2,5-diol as a raw material and Ru / rGO as a catalyst, carrying out a catalytic reaction in a solvent under hydrogen pressure of 0.5-3 MPa and temperature of 30-120℃ to obtain 2,5-dimethyl-2,5-hexanediol; Ru / rGO comprises reduced graphene oxide support and active component Ru, and the mass ratio of active component Ru to reduced graphene oxide support is 0.9-5:100. The catalyst of this invention can effectively suppress the hydrogenolysis reaction of hydroxyl groups during the hydrogenation process, achieving a conversion rate of up to 100% and a yield of 2,5-dimethyl-2,5-hexanediol of over 99.8%, demonstrating significant industrial application value.

This invention relates to a hydrogen pressurization and storage integrated gas storage and extraction method and a hydrogen refueling station system. The method includes the following steps: receiving transmitted hydrogen gas using a hydrogen storage container, and sealing the gas inlet of the hydrogen storage container after reaching equilibrium; continuously pumping ionic liquid into the hydrogen storage container until the internal hydrogen pressure reaches a set hydrogen storage pressure value, which has multiple pressure levels; when hydrogen needs to be added externally, a low-pressure hydrogen storage container is preferentially selected as the gas source, and ionic liquid is simultaneously pumped into the hydrogen storage container during the extraction process to maintain a constant internal hydrogen pressure; when a pressure switching point is reached, the gas source is automatically switched to a hydrogen storage container of another pressure level until hydrogen refueling is completed. Compared with the prior art, this invention has advantages such as improved hydrogen storage safety and guaranteed hydrogen refueling efficiency.

When supplying hydrogen to a fuel cell from a hydrogen storage alloy tank, the utilization efficiency of the hydrogen stored in the hydrogen storage alloy tank is increased. [Solution] The hydrogen utilization system comprises a hydrogen storage alloy tank, a first fuel cell connected to the hydrogen storage alloy tank and generating electricity using hydrogen supplied from the hydrogen storage alloy tank, a second fuel cell connected to the hydrogen storage alloy tank and generating electricity using hydrogen supplied from the hydrogen storage alloy tank, having a lower hydrogen demand pressure than the first fuel cell, and a control device that switches the fuel cell supplied with hydrogen from the hydrogen storage alloy tank based on the hydrogen pressure in the hydrogen storage alloy tank.

The goal is to stably supply hydrogen to hydrogen consumption facilities even without using a compressor. [Solution] A hydrogen supply system comprising: a hydrogen storage alloy that generates or stores hydrogen; a heating unit that heats or cools the hydrogen storage alloy to generate or store hydrogen in the hydrogen storage alloy; and a control unit that controls the heating unit, adjusts the pressure of the hydrogen supplied from the hydrogen storage alloy to the hydrogen consumption equipment, and controls the amount of hydrogen supplied from the hydrogen storage alloy.

The application belongs to the technical field of emergency treatment, and particularly relates to a gas cylinder high-temperature emergency treatment device and method for a fuel cell vehicle. When a PRD is blown to release hydrogen gas due to local over-temperature of a gas cylinder, a hydrogen gas pressure in a pipeline drives a mechanical trigger mechanism to act, and a high-pressure gas cylinder is opened to release high-pressure inert gas stored in the high-pressure gas cylinder. The inert gas then pushes a piston plate in a water storage and execution unit to extrude a water storage bag storing fire-fighting liquid, and drives a spraying device to perform directional spraying and cooling on a gas cylinder body. The whole process adopts mechanical linkage, and external power is not needed. The response is fast, and the reliability is extremely high. The hydrogen fuel cell vehicle is provided with an ultimate safety barrier that can still work under a power-off working condition.

The present invention relates to a process and compositions for the manufacture of amines. In particular, a process for the manufacture of diamines comprising the steps of (a) contacting a nitrile compound having the formula (I) with an amine compound having the formula RdHN-Rc in the presence of a metal catalyst under hydrogen pressure.

Disclosed is a method and system for coupling sodium slag purification process to prepare calcium-based hydrogen storage material, in which dry sodium slag is sent into a horizontal tube furnace reactor under inert atmosphere protection, the temperature is controlled at 850-950 DEG C, and the system pressure is controlled at 5-20 kPa, so that metallic sodium is volatilized to form a sodium vapor-inert gas mixed gas stream, and calcium and impurities remain in solid form, realizing separation of sodium and calcium; the mixed gas stream is sent into a first condenser and a second condenser in sequence, the condensing temperature difference is controlled at 100-200 DEG C, metallic sodium vapor is gradually condensed into liquid metallic sodium, which is collected into a sodium collection tank by gravity flow for recycling, and the solid-phase calcium and impurities remaining in the horizontal tube furnace reactor are used as calcium-based precursors; hydrogen is introduced into the horizontal tube furnace reactor, the temperature is controlled at 580-680 DEG C, the hydrogen pressure is controlled at 5-20 kPa, and the reaction is carried out for 2-4 hours, so that the solid-phase calcium is subjected to a hydrogenation reaction to obtain calcium-based hydrogen storage material containing CaH2.