322 results about "Hydrogen pressure" patented technology

The invention relates to the technical field of hydrogen storage system testing, and discloses a one-way valve combined hydrogen storage system durability test bench and a test method. A main control computer of the rack is used for configuring test task parameters, coordinating operation of subsystems and processing test data; the high-pressure hydrogen supply subsystem comprises a pressure-adjustable hydrogen source and a pressure closed-loop control module, and can apply accurate and controllable hydrogen pressure to the inlet end of the tested system according to test task parameters; the multi-channel valve state acquisition subsystem acquires the inlet and outlet pressure of the valve, the surface temperature of the valve body and vibration spectrum data in real time through pressure, temperature and vibration sensor arrays arranged at the valves, and transmits the data to the main control computer; the valve action driving subsystem comprises a high-speed electromagnetic actuator array and a displacement feedback module and can drive all valves to execute a preset opening degree sequence and opening and closing frequency. And the durability evaluation subsystem is embedded into the main control computer, calculates the accumulated damage degree of the valve and predicts the residual life cycle.

The invention provides a hydrogen supply control method of a fuel cell system, a controller, a system and a medium, and relates to the technical field of fuel cells. The method comprises the steps that in response to a starting instruction, the opening degree proportion of a first proportional valve is controlled to be adjusted to K11 from K10 through a first PID control parameter, K10 is the opening degree proportion of the first proportional valve which does not allow hydrogen to pass at all, and K11 is the initial opening degree proportion of the first proportional valve at the current environment temperature; obtaining a current actual pile entering pressure value and a hydrogen pile entering pressure set value of the electric pile; the second PID control parameter is used for controlling the opening proportion of the first proportional valve to be adjusted till the deviation between the actual reactor entering pressure value and the hydrogen reactor entering pressure set value is within the allowable error range, and the proportionality coefficient of the first PID control parameter is larger than that of the second PID control parameter. According to the method, the stability of hydrogen pressure is improved, so that the stability and the service life of the fuel cell system are improved.

The invention discloses a magnetically separable reversed-phase catalyst, a preparation method thereof and application of the magnetically separable reversed-phase catalyst in hydrogenation upgrading recovery of aromatic polyester, and belongs to the technical field of reversed-phase catalysts and plastic recovery. The catalyst is formed by loading a metal oxide (MOx) on a metal carrier nickel, and is applied to hydrogenation recovery of aromatic polyester and conversion of aromatic polyester into high value-added aliphatic polyester. After dispersion, carrying out catalytic hydrogenation reaction on the aromatic polyester at a set temperature, a set rotating speed and a set hydrogen pressure, and completing conversion of the aromatic polyester after the reaction reaches a set time; according to the method, the aromatic polyester is completely converted into the fat polyester with high additional value by using the cheap and easily-separated reverse catalyst, so that the upgraded recycling of the polyester waste plastic is realized.

The invention discloses a high-pressure hydrogen pressure reducing valve with a spiral flow channel structure. The high-pressure hydrogen pressure reducing valve comprises a valve body, a sealing end cover, a needle-shaped valve element and an inlet end cover. A through cavity is formed in the center of the valve body in the axial direction. The sealing end cover, the needle-shaped valve element and the inlet end cover are sequentially and coaxially assembled and connected into the cavity of the valve body from top to bottom. A gas outlet channel is arranged on the side wall of the valve body and located between the sealing end cover and the needle-shaped valve element, a gas inlet channel is arranged at the bottom of the inlet end cover, and gas enters from the gas inlet channel and is exhausted through the gas outlet channel. The needle valve has the advantages of being simple in structure and long in service life, and the two spiral flow channel notches are evenly distributed in the outer surface of the needle valve element; due to the design of the spiral flow channel, the hydrodynamic performance is effectively improved, the reliability of the system is enhanced, and meanwhile the energy utilization rate and the impact resistance are improved; in addition, the pressure of hydrogen at the outlet of the valve body can be effectively controlled through the design of the adjusting channel, and the pressure is still kept relatively stable under extreme conditions.

The invention relates to the technical field of high-pressure hydrogen storage of hydrogen fuel cell automobiles, and provides a high-pressure hydrogen storage bottle opening combination valve with a streamline runner and a control method. The combination valve integrates a high-pressure stop valve, a two-way flow regulating valve, a filter and a pressure / temperature / flow sensor, an air supply channel, an air inflation channel, a discharge channel and a cooling channel are designed, and the air supply channel and the air inflation channel are provided with a common rail type channel. A pilot-operated pressure reducing valve and a main runner bidirectional flow regulating valve are additionally arranged on the gas supply channel to form a two-stage pressure reducing system, so that the pressure and flow of hydrogen at an outlet are effectively limited, and the hydrogen is safely conveyed to a fuel cell; a redundant one-way valve is additionally arranged on an inflation channel to achieve rapid filling. Flow resistance and turbulent flow dissipation are remarkably reduced through a streamline channel, a sealing interface is reduced through modular integration, actuation response and power density are improved, and safety and stability of pressure reduction gas supply and high-pressure filling working conditions, intrinsic safety of the system and reliability of the whole life cycle are ensured.

The invention relates to a rare earth modified AB2 type solid hydrogen storage alloy and a batch preparation method thereof, belongs to the technical field of hydrogen storage alloy materials, and solves the problems of high activation condition, long activation period, overhigh hydrogen absorption platform pressure, high batch preparation smelting difficulty, low yield, unstable product quality and the like of the traditional Ti-Mn series hydrogen storage alloy in the prior art. The specific composition of the hydrogen storage alloy is Ti < 1.1-x-y > Y < x > Zr < y > Mn < 2.0-y-z-m > Cr < z > Ni < m > Co < n >, x, y, z, m and n in the formula are atomic ratios, x is larger than or equal to 0.01 and smaller than or equal to 0.04, y is larger than or equal to 0.10 and smaller than or equal to 0.35, z is larger than or equal to 0.45 and smaller than or equal to 0.70, m is larger than or equal to 0.1 and smaller than or equal to 0.2, and n is larger than or equal to 0.05 and smaller than or equal to 0.15. The hydrogen storage alloy has good activation performance and hydrogen absorption and desorption performance, the hydrogen storage capacity is larger than or equal to 1.86 wt.%, and the hydrogen absorption and desorption platform pressure can be adjusted according to application requirements; under the conditions that the temperature is 20 DEG C and the initial hydrogen pressure is 3 MPa, activation can be completed through one-time hydrogen absorption and desorption circulation; after 200 times of hydrogen absorption and desorption cycles, the capacity retention ratio of the alloy is gt; and 98%. The invention further provides a preparation method of the hydrogen storage alloy, the method has the advantages of being simple and easy to operate, high in yield, stable in product quality and the like, and the problem of component segregation of a casting process is fundamentally solved.

A hydrogen pressure reducer for a hydrogen supply system of a hydrogen fuel automobile relates to the technical field of hydrogen pressure reducers and comprises a valve body, a diaphragm type pressure reducing mechanism, a pilot-operated electromagnetic valve, a gas inlet and a gas outlet. The interior of the valve body is divided into a high-pressure cavity and a low-pressure cavity through the valve The diaphragm type pressure reducing mechanism is composed of a valve element assembly, a diaphragm assembly and a pressure adjusting assembly which cooperate to enable the output pressure of the air outlet to be kept stable, and assembly errors are eliminated. The valve element assembly is provided with a necking part to adjust the opening degree of a throttling hole, and accurate control is achieved. The base provides guiding constraint, and reliable sealing is ensured. The diaphragm assembly adopts a supporting disc, a diaphragm, a pressing disc and a locking nut fixing structure, so that the diaphragm is prevented from deforming, and the service life is prolonged. The pressure adjusting assembly comprises an upper cover, a pressure adjusting spring, a pressure adjusting spring seat and a pressure adjusting stud, and the pressure adjusting accuracy and stability are guaranteed. The overall reliability, sensitivity and safety of the hydrogen pressure reducer are improved.

The utility model discloses a hydrogenation ball valve with a self-locking function, which belongs to the technical field of valves, and comprises a valve body, a valve core, a valve cover, a filling pressure detection self-locking mechanism, a valve rod and a valve cover positioning mechanism, the upper end of the valve element is connected with a valve rod used for enabling the valve element to rotate to open and close the ball valve. The valve body is provided with a filling pressure detection self-locking mechanism used for locking the ball valve when the hydrogen pressure of the hydrogen inlet end is larger than the safety range. And a valve cover positioning mechanism for positioning and locking the valve cover is mounted on the outer side wall of the valve body. By means of the mode, when the hydrogen pressure on the hydrogen inlet side is too large and a hydrogen pipe on the hydrogen outlet side is damaged, the valve element can be locked, and the ball valve cannot be communicated; and when the valve cover is mounted, bolts of the flange on the valve cover do not need to be symmetrically screwed one by one through the valve cover positioning mechanism and are screwed in sequence, so that the time of an operator is saved.

The invention discloses a control method and equipment for a hydrogen subsystem of a fuel cell and a storage medium, and relates to the field of hydrogen fuel application. The method comprises the following steps: estimating a system state of the hydrogen subsystem according to a model of the hydrogen subsystem and actual measurement information of the hydrogen subsystem; predicting future output of the hydrogen subsystem according to the model of the hydrogen subsystem and the system state of the hydrogen subsystem; according to the designed performance indexes and future output of the hydrogen subsystem, the rotating speed of a hydrogen circulating pump and the opening degree of a proportional valve are determined, and feedforward compensation is conducted on the determined rotating speed of the hydrogen circulating pump. According to the invention, multi-input and multi-output control from hydrogen pressure feedback and hydrogen in-and-out reactor pressure difference feedback to target hydrogen pressure and target hydrogen in-and-out reactor pressure difference can be realized, so that the control precision is remarkably improved.

The invention belongs to the technical field of PEM electrolytic cells, and particularly relates to a PEM electrolytic cell electrochemical performance detection device which comprises an electrolytic cell, a first test mechanism and a second test mechanism. The electrolytic bath comprises a base body, a hydrogen discharge pipe, a tee joint and a hydrogen storage tank connecting pipeline; the hydrogen discharging pipe is arranged on the base body, one end of the hydrogen discharging pipe is communicated with the tee joint, one opening of the tee joint is connected with the hydrogen storage tank connecting pipeline, the other opening of the tee joint is connected with the first testing mechanism, and the first testing mechanism is connected with the second testing mechanism; the first testing mechanism is used for testing the air pressure in the hydrogen storage tank connecting pipeline; and the second testing mechanism is used for testing the water content of the hydrogen. The first test mechanism and the second test mechanism are sequentially arranged on the hydrogen discharge passage of the electrolytic bath, so that the centralized detection of the hydrogen pressure and the water content is realized, and the problem of complex structure caused by multi-point arrangement of detection devices is avoided.

The invention provides a quantitative detection method for the average pressure of hydrogen in a PEM electrolyzed water cathode catalyst layer, and relates to the technical field of hydrogen production by electrolyzed water. The quantitative detection method comprises the following steps: carrying out a hydrolysis reaction in a PEM electrolytic cell, and calculating a hydrogen permeation flux N1 and a corresponding back pressure P1 under an electrolysis working condition; in another PEM electrolytic cell with the same structure, hydrogen is introduced into the cathode side, back pressure is applied to a cathode opening, meanwhile, inert gas is introduced into the anode side, an anode product channel is continuously purged, and the hydrogen permeation flux N2 under the hydrogen introduction working condition is calculated; gradually adjusting the back pressure under the hydrogen feeding working condition, repeating the step of testing the permeation flux under the hydrogen feeding working condition to obtain the hydrogen permeation flux under different back pressures, and drawing an N2-P2 curve; and determining a corresponding hydrogen back pressure value P2 when N1 is equal to N2, and calculating according to a formula deltaP = P2-P1 to obtain the average hydrogen pressure deltaP.

The invention discloses a PID control apparatus and method of a fuel cell system. The PID control device comprises a hydrogen pressure sensing unit which collects an actual hydrogen pressure value at an outlet of a hydrogen proportional valve arranged between the hydrogen supply device and the fuel cell stack and generates a collected value representing the actual hydrogen pressure value; the PID controller is used for carrying out a preset PID control algorithm on a hydrogen pressure deviation value between the acquisition value and target hydrogen pressure of the fuel cell system, the variable quantity of the hydrogen pressure deviation value and the cumulant of the hydrogen pressure deviation value so as to obtain a coefficient of the PID controller; and calculating a control amount for the opening degree of the hydrogen proportional valve according to the coefficient.

Provided is an alkane production method wherein a continuous reaction of an alcohol and hydrogen proceeds at a low reaction pressure, carbon reduction from the alcohol can be suppressed, and the conversion rate is excellent. This alkane production method for producing an alkane from a C8-22 alcohol comprises a step in which the alcohol and hydrogen are continuously reacted under the following conditions. (i) The reaction is carried out in the presence of a zeolite carrier supporting palladium, the reaction temperature is 180°C or higher, and the hydrogen pressure is 0 MPa to 0.7 MPa in terms of gauge pressure. (ii) The space velocity (SV) of the hydrogen relative to the volume of a catalyst in which the palladium is supported on the zeolite carrier is 1200 h–1 to 2400 h–1. (iii) The space velocity (SV) of the alcohol relative to the volume of the catalyst in which the palladium is supported on the zeolite carrier is 8 h–1. (iv) The zeolite carrier is of an H-beta type or an H-ZSM-5 type, has a molar ratio (SiO2 / AL2O3) between silica (SiO2) and alumina (AL2O3) of 23 to 27, and has a palladium support quantity of 0.1 mass% to 5 mass%.

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.

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.

The invention discloses a method for preparing chiral succinimide through asymmetric hydrogenation of alpha-alkylene succinimide under the catalysis of nickel. The method comprises the following steps: in a solvent, under certain hydrogen pressure and temperature, alpha-alkylene succinimide represented by a general formula (1) is hydrogenated into a chiral succinimide compound represented by a general formula (2) by a nickel chiral catalyst; the structural formulas of the general formulas (1) and (2) are shown in the specification. The method is mild in reaction condition, simple and convenient to operate, capable of achieving good yield and efficiency and wide in application prospect.

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

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.

The application provides a hydrogen storage cylinder gas outlet assembly structure and belongs to the technical field of hydrogen storage cylinders. The hydrogen storage cylinder body is characterized in that a gas outlet is reserved on the hydrogen storage cylinder body, a conveying passage is arranged on the right side of the gas outlet, and the gas outlet and the conveying passage are connected through an assembly module. The application solves the problem that the assembly between the existing hydrogen storage cylinder gas outlet and the conveying passage is generally achieved through the cooperation of bolts and two discs to realize the butt joint between the hydrogen storage cylinder gas outlet and the conveying passage. During the conveying of hydrogen, the increased hydrogen pressure impulse may cause the overflow of hydrogen between the two discs, which not only causes the pollution of the surrounding environment, but also greatly reduces the safety and causes the damage of the two discs.

The invention discloses a hydrogenated lecithin synthesis method based on a nickel catalysis continuous flow strategy, relates to the technical field of preparation of hydrogenated lecithin, and aims to solve the problem that the cost of preparing the hydrogenated lecithin is greatly increased due to the fact that the hydrogen pressure is relatively high and recycling of a catalyst is not considered in an existing method. The preparation method is technically characterized by comprising the following steps: (1) performing heat treatment on moso bamboo powder in a protective gas atmosphere to obtain a carbon carrier; dipping the carbon carrier in an alkali solution, and then carrying out a high-temperature activation reaction in a protective gas atmosphere; an activated carbon carrier is obtained; the preparation method comprises the following steps: loading a nickel source, an auxiliary agent and a structure stabilizer into an activated carbon carrier by dipping to obtain a catalyst precursor, and pyrolyzing the catalyst precursor in a protective gas atmosphere to obtain a Ni / C catalyst, and (2) preparation of hydrogenated lecithin: dissolving lecithin in a mixed solution of dichloromethane and methanol, taking a Ni / C catalyst, filling a catalytic pipeline with the Ni / C catalyst, and carrying out a hydrogenation reaction under hydrogen flow to obtain the hydrogenated lecithin.

The application relates to the technical field of hydrogen storage system testing, and discloses a one-way valve combined hydrogen storage system durability test bench and a testing method. A main control computer of the bench is used for configuring test task parameters, coordinating operation of each subsystem, and processing test data; a high-pressure hydrogen gas supply subsystem contains an adjustable pressure hydrogen gas source and a pressure closed-loop control module, can apply accurate controllable hydrogen gas pressure to an inlet end of a measured system according to test task parameters; a multichannel valve state acquisition subsystem acquires valve inlet and outlet pressure, valve body surface temperature and vibration spectrum data in real time through a pressure, temperature and vibration sensor array arranged at each valve, and transmits the data to the main control computer; a valve action driving subsystem contains a high-speed electromagnetic actuator array and a displacement feedback module, and can drive each valve to execute a preset opening degree sequence and opening and closing frequency; and a durability evaluation subsystem is embedded in the main control computer, calculates valve cumulative damage degree, and predicts a remaining service life.

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.

The utility model discloses a hydrogen supply system of a hydrogen internal combustion engine, which relates to the field of hydrogen internal combustion engines, and comprises a main hydrogen supply tank communicated with the first end of an electric control three-way valve through a first pipeline, a main electric control pressure regulating valve deployed in the first pipeline, and an auxiliary hydrogen supply tank communicated with the second end of the electric control three-way valve through a second pipeline, the auxiliary pressure regulating valve is arranged in the second pipeline, the third end of the electric control three-way valve is communicated with the hydrogen internal combustion engine, in the normal operation state, the first end and the third end of the electric control three-way valve are communicated, and the second end and the third end of the electric control three-way valve are not communicated, and in the abnormal operation state, the first end and the third end of the electric control three-way valve are not communicated, and the second end and the third end of the electric control three-way valve are communicated. On the basis of the electronic control three-way valve, the auxiliary hydrogen supply tank is used for replacing the main hydrogen supply tank to supply hydrogen to the hydrogen internal combustion engine in the abnormal operation state, the main electronic control pressure adjusting valve and the auxiliary pressure adjusting valve are arranged to adjust the hydrogen output pressure of the corresponding hydrogen supply tank, and the operation reliability of the hydrogen supply system and the hydrogen internal combustion engine is improved.

The invention discloses a toluene hydrogenation catalyst used at room temperature and normal pressure as well as a preparation method and application thereof, oxidation modified carbon nanofibers are adopted as a carrier, and face-centered cubic Ru is loaded on the oxidation modified carbon nanofibers in the form of nanoparticles through solvothermal reaction to obtain the toluene hydrogenation catalyst. The catalyst provided by the invention can efficiently catalyze toluene hydrogenation to generate methylcyclohexane under the conditions of room temperature and normal hydrogen pressure. Compared with a traditional catalyst, the carbon oxide nanofiber supported ruthenium catalyst not only can work under relatively mild conditions, but also can keep relatively high activity in long-time use, and provides a key support for low cost of an organic liquid hydrogen storage technology.

A method for coordinating an evaporation process of hydrogen from a hydrogen tank of a motor vehicle by an assistance system includes initiating the evaporation process of hydrogen from the hydrogen tank of the motor vehicle into an area surrounding the motor vehicle by an electronic computing device of the assistance system in accordance with a hydrogen pressure in the hydrogen tank. Evaporation information regarding an additional motor vehicle having an additional hydrogen tank is received by a communication device of the assistance system. The evaporation process of hydrogen from the hydrogen tank of the motor vehicle is coordinated in accordance with the evaporation information regarding the additional motor vehicle.

This invention proposes a diagnostic method for hydrogen exhaust valves used in fuel cells, specifically for diagnosing faults in the fuel cell power system's power generation process where the hydrogen exhaust valve cannot be opened. During power generation, it was observed that when the hydrogen exhaust valve fails to open, the pressure at the fuel cell hydrogen inlet deviates very little from the actual set pressure, remaining essentially consistent with the set pressure. It was also found that after the hydrogen exhaust valve fails to open, and the fuel cell power generation system continues to operate, impurities such as water and nitrogen accumulate at the anode, leading to performance degradation. Based on this phenomenon, this invention uses a comprehensive diagnostic approach, considering the deviation between the set hydrogen pressure and the target pressure, as well as whether the fuel cell power system experiences a voltage undervoltage fault, to comprehensively diagnose the hydrogen exhaust valve's inability to open. This method is independent of changes in fuel cell performance, is simple, convenient, and provides a more accurate diagnosis of whether the hydrogen exhaust valve is unable to open.

The invention discloses a drainage control method and device of a fuel cell and a nonvolatile storage medium. The method comprises the following steps: obtaining a current control combination of a drain valve in the fuel cell, the current control combination comprising an opening time length and a closing time length; under the condition that the drain valve is in the open state, based on the actual hydrogen pressure value in the fuel cell, adjusting the total duration corresponding to the current control combination to obtain a first total duration; under the condition that the opening state of the drainage valve continues to be opened for the duration, the drainage valve is closed; under the condition that the drain valve is in a closed state, adjusting the first total time length based on the current of a hydrogen circulating pump in the fuel cell to obtain a second total time length; and determining the next control combination of the drain valve according to the second total duration. According to the invention, the technical problem that too high or too low accumulated water in the fuel cell has adverse effects on the operation of the fuel cell is solved.

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 application relates to a supported NiSn-ReO x / TiO2 catalyst and a preparation method thereof and application thereof in selective hydrogenation of furfural. In the preparation method, a continuous impregnation method is used to load NiSn alloy and ReO x on a titanium dioxide carrier, formation of the NiSn alloy effectively inhibits deep hydrogenation of a furan ring by a Ni-based catalyst, and ReO x doping greatly improves hydrogenation activity of the catalyst for a C=O bond and a rearrangement rate of furfuryl alcohol. The prepared catalyst is used for catalyzing water-phase hydrogenation of furfural to prepare cyclopentanone, and at a lower reaction temperature and hydrogen pressure, the catalyst has higher catalytic conversion efficiency and cyclopentanone selectivity, furfural conversion rate is close to 100%, and cyclopentanone yield is as high as 92.5%. The prepared NiSn-ReO x / TiO2 catalyst has high dispersion of active components, good stability and is easy to recover.