13results about How to "Reduce hydrogen concentration" patented technology

This invention relates to the field of hydrogen embrittlement resistant workpieces, and provides a workpiece utilizing pores to resist hydrogen embrittlement and its preparation method. The preparation method includes a workpiece forming step: forming the workpiece and making the surface and / or interior of the workpiece have pores that act as hydrogen traps. The surface and / or interior of the workpiece have pores that act as hydrogen traps. The workpiece and its preparation method provided by this invention utilize pores to resist hydrogen embrittlement, by pre-setting pores within the workpiece as hydrogen traps. The pores that exist inside the workpiece beforehand have a higher binding energy with hydrogen, so hydrogen will preferentially diffuse into the internal pores during diffusion, thereby reducing the hydrogen concentration inside the workpiece and effectively alleviating hydrogen embrittlement. It does not require the addition of specific microalloying elements to improve the material's resistance to hydrogen embrittlement, and it does not need to consider the compatibility of the added elements with the material matrix, thus not being limited to one or a few fixed materials, greatly reducing application costs and having broad promotion and application value.

The invention discloses a gasified hydrogen recovery and pressure relief coupling system for liquid hydrogen storage. The secondary heat exchanger and the primary heat exchanger are respectively provided with a cold side inlet, a cold side outlet, a hot side inlet and a hot side outlet; a hydrogen and air inlet and a tail gas outlet are formed in the auxiliary power device; a hydrogen and diluent gas inlet and a mixed gas outlet are formed in the mixed gas cylinder; a first liquid hydrogen pump in the liquid hydrogen storage tank is connected with the power device through a first one-way valve; a gas hydrogen outlet of the liquid hydrogen storage tank is connected with a hydrogen inlet of the mixed gas cylinder and an inlet of the hydrogen compressor, an outlet of the hydrogen compressor is connected with a cold side inlet of the secondary heat exchanger, and a cold side outlet of the secondary heat exchanger is connected with a hydrogen inlet of the auxiliary power device. An outlet of the air compressor is connected with a cold side inlet of the primary heat exchanger, and a cold side outlet of the primary heat exchanger is connected with an air inlet of the auxiliary power device. According to the liquid hydrogen storage tank, the situation that evaporation gas hydrogen in the liquid hydrogen storage tank is directly discharged to cause aircraft energy waste can be avoided, and meanwhile redundant evaporation gas hydrogen can be safely and reliably discharged to the external environment.

A metal paste for bonding includes metal particles, a dispersion medium, a reducing agent, and a reduction aid, in which the metal particles contain copper particles, the reduction aid includes a coordinating compound having electron back-donation properties, the coordinating compound is at least one selected from the group consisting of an organic phosphorus compound and an organic sulfur compound, and the metal paste for bonding contains, as a reducing agent, 1.6 parts by mass or more and 10 parts by mass or less of a polyol-based compound with respect to 100 parts by mass of the total mass of the copper particles.

According to the control method for the standard exceeding of the hydrogen concentration in the fuel cell stack shell and the matched control system, whether the hydrogen concentration exceeds the standard or not is actively diagnosed by detecting the hydrogen concentration in the fuel cell stack shell, and when the hydrogen concentration exceeds the standard, corresponding emergency treatment measures are taken to maintain system operation or normal starting, so that the safety of the fuel cell stack shell is ensured. The problem that the fuel cell is directly shut down or cannot be started when the hydrogen exceeds the standard and is inconvenient for a user to use is solved, and meanwhile, the running safety of a fuel cell system is improved.

The utility model discloses a pipeline system and a hydrogen fuel cell. The pipeline system comprises an inner pipeline, an outer pipeline, a driving device and a box body, a first flow channel is arranged in the inner pipeline and is used for conveying hydrogen; the inner pipeline is sleeved with the outer pipeline, a second flow channel is defined by the inner wall face of the outer pipeline and the outer wall face of the inner pipeline, the second flow channel is isolated from the first flow channel and the external atmospheric environment, and the second flow channel is filled with nitrogen; an inner cavity of the box body is isolated from the external atmospheric environment and communicates with the outer pipeline, and the driving device is used for driving nitrogen to flow. When the hydrogen is conveyed in the first flow channel, if leakage or permeation occurs, the hydrogen can be leaked into the second flow channel, and because nitrogen in the second flow channel is in a circulating state, the leaked hydrogen enters the box body along with the circulating nitrogen, so that the hydrogen in the inner pipeline is prevented from being leaked into the external environment to generate explosion, suffocation and other dangers; and leaked and permeated hydrogen is automatically treated, so that the safety and reliability of the system are enhanced.

A hydrogen generator with hydrogen leakage self-aware function comprises an electrolytic module, an integrated passageway device, a condensate filter, a humidification cup, a housing, an internal hydrogen sensing component, and a monitoring device. The electrolytic module is configured to electrolyze an electrolyzed water to generate a gas comprising hydrogen. The integrated passageway device comprises gas inlet passageway and a gas outlet passageway. The condensate filter is configured for filtering the gas comprising hydrogen. The humidification cup is configured for humidifying the gas comprising hydrogen. The gas comprising hydrogen flows through the condensate filter and the humidification cup by the way of the integrated passageway device. The internal hydrogen sensing component is configured in the housing for sensing the hydrogen concentration in the housing to generate an internal sensing result. The monitoring device is coupled to the internal hydrogen sensing component. The monitoring device controls the operation of the hydrogen generator according to the internal sensing result to avoid the hydrogen generator from the problem caused by hydrogen.

An exhaust gas treatment device including an outer housing including a first inflow part and a second inflow part, an inner housing provided in the outer housing and having a gas inflow part, a guide channel defined between the outer housing and the inner housing and configured to guide a part of the first exhaust gas to the gas inflow part, and a spiral member including a barrel part provided in the inner housing and configured to define a passage flow path, a spiral protrusion provided on an outer surface of the barrel part and configured to define a spiral flow path between the barrel part and the inner housing, and a gas discharge part provided in the barrel part and configured to discharge the first exhaust gas and the second exhaust gas, which have passed through the spiral flow path, to the passage flow path.

This invention belongs to the field of automotive manufacturing technology and discloses a hydrogen engine and its control method, as well as a vehicle. The engine includes a crankcase ventilation system, a hydrogen scavenging system, and an ECU. An air filter is installed in the engine intake pipe. The crankcase injection pipe is connected to the engine intake pipe and the crankcase. Both a low-load outlet branch and a high-load outlet branch are connected in parallel to the crankcase outlet pipe and the engine intake pipe. A vacuum pump is installed on the high-load outlet branch. Hydrogen concentration sensors are respectively installed in the crankcase, on the crankcase outlet pipe, and on the intake manifold. A scavenging pipe is equipped with a scavenging pump and is connected to the hydrogen rail and the intake manifold. The low-load outlet branch is connected to the scavenging pipe. The crankcase ventilation system and the hydrogen scavenging system are electrically connected to the ECU. This invention monitors the engine hydrogen concentration. The vacuum pump delivers hydrogen from the crankcase and pipes into the cylinders for combustion. When the engine is stopped, it effectively scavenges and burns the hydrogen in the hydrogen rail, improving engine safety.

The present invention relates to the technical field of hydrogen engines, and in particular to a hydrogen concentration control system, an engine and a hydrogen concentration control method for a hydrogen internal combustion engine. The hydrogen concentration control system for a hydrogen internal combustion engine includes an air intake, at least two air storage units, at least two detection components, an air outlet and a control device, wherein the air intake includes a gas diverter, the gas diverter includes an air inlet and at least two diverter ports, and the inlets of at least two air storage units are connected to the at least two diverter ports in a one-to-one correspondence, each air storage unit is connected to a detection component, and the detection component is used to detect the storage capacity of the air storage unit, the air outlet includes an oxidation catalyst, and the outlets of at least two air storage units are connected to the inlet of the oxidation catalyst, and the control device is electrically connected to the gas diverter and the detection component, respectively. In this embodiment, the control device automatically adjusts the opening of the gas diverter according to the detection results, so that the gas distribution is more accurate, thereby achieving efficient control of the hydrogen concentration.

A fuel cell engine comprises a box body, a containing cavity is formed in the box body, an air outlet and an air inlet are formed in the top face of the box body, a purging channel is formed in the box body, and a plurality of air inlet communicating holes penetrating to the purging channel are formed in the cavity wall, relative to the second direction, of the containing cavity in the first direction and the vertical direction in an array mode. The purging channel comprises a main channel and a plurality of branch channels, the main channel extends in the vertical direction and communicates with the air inlet, the plurality of branch channels are arranged at intervals in the vertical direction, the branch channels comprise first channels and a plurality of second channels, the first channels extend in the first direction, and the plurality of second channels are arranged at intervals in the first direction; the first channel extends in the first direction and is spaced from the main channel in the first direction, the second channel extends in the vertical direction, and the first channel communicates with the main channel and communicates with the second channel; according to the utility model, the accommodating cavity can be uniformly purged, and the condition that the local hydrogen concentration in the accommodating cavity is relatively high is prevented.

The invention discloses a multi-dimensional removal method for hydrogen damage of a nickel-based superalloy. The multi-dimensional removal method comprises the following steps: carrying out a creep test on a nickel-based superalloy sample according to design requirements; a nickel-based high-temperature alloy sample is put into an acetone solution to be cleaned; the nickel-based high-temperature alloy sample is subjected to ultrasonic cleaning; the nickel-based superalloy sample is put into an electrolyte to be subjected to electrolytic treatment, so that the hydrogen damage defect on the surface of the nickel-based superalloy sample is removed; taking out a test block from the surface of the nickel-based superalloy sample, grinding the test block, putting the test block into a thermal desorption instrument, and carrying out a thermal desorption test to obtain a curve of the thermal desorption rate of the nickel-based superalloy test block along with the temperature change; and the nickel-based superalloy sample is put into a vacuum heat treatment furnace to be subjected to cyclic heating treatment, so that the average hydrogen concentration of the nickel-based superalloy sample is reduced. According to the method, the internal hydrogen damage defect and the surface hydrogen damage defect caused by service of the nickel-based superalloy in the hydrogen-rich environment can be removed at the same time, and therefore the mechanical property of the nickel-based superalloy is recovered.

The present invention discloses an exhaust silencer and a car. One end of the inner tube of the exhaust silencer is an air inlet, and the other end is an air outlet. The inner tube is provided with a plurality of inner vents. The middle tube is sleeved on the outer side of the inner tube, and the two ends of the middle tube are connected to the outer wall of the inner tube. A first cavity is defined between the middle tube and the inner tube, and there is an inner vent leading to the first cavity. A silencer structure is provided in the first cavity. The middle tube is also provided with a plurality of middle vents. The outer tube is sleeved on the outer side of the middle tube, and one end of the outer tube is connected to the outer wall of the middle tube or the inner tube, and the other end is connected to the outer wall of the inner tube. A second cavity is defined between the outer tube, the middle tube and the inner tube, and all the middle vents and a part of the inner vents lead to the second cavity. A hydrogen inlet leading to the second cavity is also provided on the tube wall of the outer tube. The exhaust silencer and the car can dilute the hydrogen concentration at the exhaust port while reducing exhaust noise, thereby reducing safety hazards.

The application discloses a hydrogen removal unit for a battery, a preparation method of the hydrogen removal unit and an aluminum shell battery, and relates to the technical field of sodium battery safety. The hydrogen removal unit is used for being integrated on the inner side of a battery cover plate pressure relief valve. In a normal state, trace hydrogen is adsorbed by a physical adsorption material in a physical adsorption section. When thermal runaway occurs, the hydrogen is forced to flow through an irreversible catalytic hydrogenation reaction of a chemical hydrogen fixation section by using the heat and pressure of high-temperature gas, so that the hydrogen concentration is greatly reduced, and then the battery cell is discharged, thereby reducing the risk of combustion and explosion of the outflow gas from the source.