15results about How to "Improve hydrogen production efficiency" patented technology

The application discloses an electrolysis water self-supporting catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: selecting carbonized wood as a substrate, placing the carbonized wood into a metal salt solution, and adopting an electrochemical deposition technology to in-situ electrodeposition of transition metals on the carbonized wood to obtain a precursor of metal and carbonized wood hybrid; and co-pyrolyzing the precursor and melamine, so that metal nanoparticles are coated in nitrogen-doped carbon nanotubes and in-situ grown on the carbonized wood to obtain the electrolysis water self-supporting catalyst, and the whole preparation process is simple and easy to control, and the prepared electrolysis water self-supporting catalyst has a three-dimensional hierarchical porous structure, high conductivity and good catalytic activity and stability, and can be used for industrial current density electrolysis water hydrogen production.

The invention discloses a nano porous nickel electrocatalyst material as well as a preparation method and application thereof. Belongs to the technical field of electrolyzed water hydrogen production catalysts. According to the method, a nickel net substrate is subjected to pretreatment, electrogalvanizing, high-temperature alloying and chemical dealloying, and finally the nano-porous nickel electrocatalyst material growing on the nickel net is obtained. The electrocatalyst material prepared by the method has a uniform three-dimensional nano porous structure, the thickness of a porous layer is 10-70 [mu] m, and the aperture is 100-500 nm. As an alkaline electrolytic water hydrogen evolution reaction cathode catalyst, the material has high specific surface area and rich active sites, and shows lower overpotential and excellent long-term stability. The method is simple in technological process, raw materials are easy to obtain, and the method has large-scale production potential and has wide application prospects in the field of hydrogen production through water electrolysis.

This invention discloses a method and system for hydrogen production using recycled PET waste and wastewater, belonging to the field of hydrogen production technology. The method involves immersing the lower half of a microreactor with a three-dimensional porous structure into an alkaline PET depolymerization solution. The alkaline PET depolymerization solution is made from PET waste, wastewater, and an alkaline catalyst. Utilizing the photothermal conversion capability of the microreactor under illumination, the solution is driven upwards to the high-temperature upper half of the microreactor, where vigorous evaporation occurs, producing water and ethylene glycol. The alkaline catalyst is concentrated, precipitated, and participates in catalysis at the evaporation interface. The mixed steam undergoes a KOH catalytic reforming reaction in the high-temperature zone of the microreactor to produce hydrogen. The water vapor is condensed and recovered, and the alkaline catalyst is directly collected. The alkaline catalyst achieves in-situ regeneration and recycling, and absorbs carbon emissions generated during the reaction, achieving zero pollution and high-purity hydrogen production. This invention achieves green energy hydrogen production and plastic degradation through an integrated design of alkaline degradation, alkaline catalysis, and alkaline recovery.

The application discloses a hydrogen production device, and relates to the technical field of hydrogen production.The hydrogen production device comprises an electrolytic cell, a gas-liquid separation device and a purification device connected in sequence, wherein the separation device comprises a first separation device and a first post-stage separation device; the hydrogen production device further comprises a heat exchange device, the heat exchange device has a first flow channel and a second flow channel arranged in a heat exchange mode, one end of the first flow channel is connected with a gas outlet of the first post-stage separation device, and the other end of the first flow channel is connected with a gas inlet of the purification device; one end of the second flow channel is connected with a gas outlet of the first separation device, and the other end of the second flow channel is connected with a gas inlet of the first post-stage separation device; or one end of the second flow channel is connected with a liquid backflow port of the first separation device, and the other end of the second flow channel is connected with a liquid inlet of the electrolytic cell. The technical problem of long heating time required by the purification device is solved.

The application discloses a system and method for solar oxidation degradation of organic wastewater and hydrogen production, and the whole system comprises a membrane separation subsystem, a solar heat collection subsystem and a multi-electrode reverse electrodialysis subsystem. The system takes solar energy as a driving force, takes high-salt organic wastewater as a working solution, realizes hydrogen production and organic matter degradation by means of a concentration difference of the working solution, separates the high-salt organic wastewater into high-salt wastewater and organic wastewater, and realizes effective utilization and efficient degradation of the high-salt organic wastewater by combining solar energy and reverse electrodialysis. That is, the system can completely mineralize the organic matter in the wastewater and produce high-purity hydrogen, and realizes efficient and high-quality utilization of solar energy.

The application discloses a kind of configuration optimization method, device and system of integrated hydrogen production system, belong to hydrogen production technical field, the integrated hydrogen production system configuration optimization method provided by the present application, the two-stage configuration model of integrated hydrogen production system considering the uncertainty of photovoltaic output and biomass water content is established, the objective function is set as the minimization of investment cost and the operating cost of the worst scenario corresponding to the uncertainty set;Solve the above two-stage configuration model to obtain the optimized configuration scheme, thereby improving the robustness of configuration to ensure smooth hydrogen production.The scheme can ensure smooth hydrogen supply while meeting the system carbon emission requirements under photovoltaic, biomass access, reduce system component investment.In addition, the technical parameters involved therein relate to hydrogen production components and energy storage components, and the key parameters affecting the configuration results of system hydrogen production and energy storage can be subjected to sensitivity analysis.

This invention discloses a low-voltage, high-current electrolytic hydrogen production power supply system and control method based on a SiC and IGBT hybrid half-bridge, belonging to the field of electrolytic hydrogen production technology. The system includes: a hybrid half-bridge power module, used to convert the bus voltage into the total system output voltage and output IGBT branch current and SiC branch current under the control of a drive signal; a drive and isolation module, connected between the digital control and sampling module and the hybrid half-bridge power module, used to generate a drive signal based on a PWM signal and send the drive signal to the hybrid half-bridge power module; and a digital control and sampling module, used to sample key state variables of the system, calculate the PWM signal based on the key state variables, and send the PWM signal to the drive and isolation module. This invention compensates for the ripple of the low-frequency IGBT branch in real time through the high-frequency SiC branch, avoiding the problem of temporary ripple increase in traditional hybrid topologies during transients.

The invention provides a start-stop and scheduling control method for an ALK-PEM hybrid hydrogen production system. The method comprises the following steps: collecting real-time output power and historical power data of a renewable energy power generation end; based on the real-time output power and the historical power data, outputting a power pre-judgment result in a future preset time period through an improved neural network model with electrochemical inertia compensation; according to a power pre-judgment result, combining the performance characteristics of the ALK and PEM electrolytic cells, and according to a rule that the ALK electrolytic cell unit is responsible for relatively smooth steady-state power and the PEM electrolytic cell unit is responsible for a steep rising and falling part, performing dynamic power distribution on the ALK and PEM electrolytic cell units; and according to the power interval where the real-time output power is located, hierarchical optimization control is conducted on the ALK electrolytic cell unit and the PEM electrolytic cell unit. According to the scheme, the problems that power distribution is unbalanced and the hydrogen production efficiency is low due to the fact that existing hybrid system control cannot deal with output intermittency of renewable energy sources are solved.

The application relates to the technical field of electrolytic tanks for hydrogen production by electrolysis of water, in particular to an electrolytic tank for hydrogen production by electrolysis of water, which comprises a first end plate and a bolt arranged in the first end plate, the other end of the bolt is connected with a second end plate in a penetrating mode, an electrolytic tank body is arranged between the first end plate and the second end plate, an electrolyte inlet is arranged in the second end plate in a penetrating mode, the electrolytic tank body is composed of multiple electrolytic cells, each electrolytic cell is composed of a first cylinder frame, a cathode plate, an anode plate, a second cylinder frame and a diaphragm body, and the outer sides of the first cylinder frame and the second cylinder frame are both fixedly provided with a first fixed pipe. The electrolytic tank for hydrogen production by electrolysis of water can well stir the surrounding electrolyte through the cooperation of the stirring block and the stirring plate, the stirring range is increased, the gas bubbles are prevented from being retained on the cathode plate and the anode plate, and therefore the electrolysis efficiency of the electrolytic tank body and the hydrogen production efficiency can be improved.

This invention provides an energy management optimization method, system, device, and storage medium for reducing voltage fluctuations and improving hydrogen production efficiency. The method is based on a wind-solar hydrogen production system, which includes a grid unit, a photovoltaic power generation unit, a wind power generation unit, and an electrolyzer unit. The grid unit is connected to node 1, the photovoltaic power generation unit is connected to node 3, the wind power generation unit is connected to node 4, and the electrolyzer unit is connected to node 5. Nodes 1, 3, 4, and 5 are each connected to node 2. The energy management optimization method provided by this invention does not backcharge reactive power to the grid, avoiding the release of excess reactive power from photovoltaic and wind power. The wind-solar hydrogen production system can improve hydrogen production efficiency by optimizing the voltage at the electrolyzer unit's connection point. The system can improve hydrogen production efficiency while optimizing line losses to avoid energy waste.

The application discloses a kind of solid hydrogen storage materials and preparation method thereof.The material is dense solid composite, by hydrogen production agent, non-noble metal boride catalyst and composite lithium cobalt oxide carrier is formed by pressure molding, and water can be supplied hydrogen.Hydrogen production agent is based on sodium borohydride or potassium borohydride;The carrier is modified composite lithium cobalt oxide, and has carrier and catalytic function.This application eliminates liquid solvent and porous support structure, builds synergistic catalytic system, to improve mass and volume hydrogen storage density, and ensure stable hydrogen production rate.Preparation method only involves solid phase mechanical mixing and pressing molding, and process is simple, suitable for large-scale production.The material has the characteristics of portable, safe, and can be used as an ideal hydrogen source, applied to hydrogen fuel cell and other fields.

The application discloses an extraction method salt lake lithium extraction wastewater treatment system and a treatment method. The extraction method salt lake lithium extraction wastewater treatment system treatment system comprises: a gas floating unit for gas floating treatment of wastewater, outputting dregs and a first liquid; an adsorption unit for adsorbing impurities including at least a surfactant in the first liquid, outputting a second liquid; a filtration unit for filtering the second liquid, outputting a third liquid; a hydrogen production unit for electrolytic hydrogen production and removal of organic matter using the third liquid, outputting hydrogen and a fourth liquid; and a post-treatment unit for extracting lithium resources in the fourth liquid, outputting lithium products. The extraction method salt lake lithium extraction wastewater treatment system of the application has simple structure, low investment and operation cost, can not only realize deep removal of organic matter, but also can recover hydrogen resources and lithium resources, effectively solves the technical problem of high wastewater treatment cost in the prior art, and has strong practicability.

This invention relates to a supported catalyst with low noble metal content, its preparation method, and its application. The supported catalyst comprises a catalyst support and an active component, wherein the content of the active component is 0.2–0.4 wt%, and the relative impregnation depth of the active component is 0.05–0.16. When applied to the dehydrogenation of liquid organic hydrogen storage carriers, compared with high-noble metal-based dehydrogenation catalysts, the low-noble metal content catalyst of this invention can achieve a similar degree of dehydrogenation under the same catalyst loading and reaction conditions, significantly improving the hydrogen production efficiency per unit mass of noble metal and substantially reducing the cost of the dehydrogenation catalyst.

The application discloses a new energy electrolytic hydrogen production rectifier with off-grid adaptability and a control method, and the rectifier comprises an inverter with droop control, a transformer, a non-controlled rectifier, a DC / DC converter and a controller, can adapt to new energy fluctuation power supply environment, and supports off-grid operation.The control method comprises the following steps: S1, rectifying alternating current and inputting to the DC / DC converter; S2, collecting a real-time frequency value and calculating a frequency deviation value; S3, generating a direct current instruction value; S4, collecting an actual output current value; S5, generating a PWM control signal and adjusting the output current; and S6, realizing speed regulation of the output power of the non-controlled rectifier.The application can achieve the function of assisting in stabilizing the frequency of an off-grid micro-grid, can adapt to the working condition of off-grid new energy electrolytic hydrogen production in the scene of off-grid new energy electrolytic hydrogen production, and enables the hydrogen production load end to follow the high fluctuation of new energy power generation, and simultaneously assists in stabilizing the frequency of the off-grid system.

The application discloses a gas-water separation flow field structure and a hydrogen production equipment comprising the same. The gas-water separation flow field structure comprises a bipolar plate. The bipolar plate is provided with a fence at the edge to enclose an enclosed area. The enclosed area is provided with an inlet, an outlet and a flow splitting structure. The flow splitting structure is symmetrical and has two. A main flow channel is reserved between the two flow splitting structures. A branch flow channel is reserved between the flow splitting structure and the fence. The flow splitting structure comprises an inflow flow splitting plate and a plurality of baffle plates. Two adjacent baffle plates form a reaction zone. The two ends of the reaction zone are connected to the main flow channel and the branch flow channel respectively. The electrolyte with a faster moving speed flows in the main flow channel and the branch flow channel. The electrolyte with a slower moving speed is subjected to electrolysis reaction in the reaction zone. The pressure difference is caused by the flow rate difference between the main flow channel, the branch flow channel and the reaction zone. The hydrogen concentration difference exists between the reaction zone and the main flow channel and the branch flow channel. The double power drives the hydrogen in the reaction zone to be discharged quickly.