31 results about "Cryogenic technology" patented technology

According to the direct-expansion cryogenic pre-dehumidification and heat pump regeneration combined low-dew-point double-rotating-wheel dehumidification system, the control method and the terminal, accurate regulation and control of all devices in the rotating-wheel dehumidification system are achieved according to data collected by the sensor module in real time, and therefore the stability of the air supply dew-point temperature is ensured. By adopting the direct expansion cryogenic technology, the dehumidification burden of the rotating wheel is effectively relieved, and the regeneration temperature is reduced, so that the energy consumption in the regeneration process is remarkably reduced. The regeneration heat pump condenser is installed at the inlet of the rotating wheel, part of regeneration heat can be borne, and regeneration energy consumption is further reduced. A regeneration heat pump evaporator is further installed at an exhaust outlet of the rotating wheel, heat in regeneration exhaust can be recycled, and the purpose of saving energy is achieved. According to the rotating wheel dehumidification system, dual optimization of dehumidification performance and energy consumption performance is achieved, the dehumidification efficiency is remarkably improved, and the energy consumption of the system is reduced.

The utility model discloses an atmospheric pressure liquid nitrogen storage tank emptying low-temperature nitrogen cooling capacity recovery system, which relates to the technical field of deep cooling and comprises a liquid nitrogen storage tank, a standby regulating valve on the liquid nitrogen storage tank is connected with a low-temperature supercharger through a pipeline, and the outlet end of the low-temperature supercharger is connected with a vacuum heat preservation pipeline. The outlet end of the vacuum heat preservation pipeline is connected with an emptying pipeline and a conveying pipeline used for being connected with a nitrogen pipeline in an air separation device, and the output end of the nitrogen pipeline is further connected with a heat exchanger. The supercharged low-temperature nitrogen is conveyed to a nitrogen pipeline in the air separation device through a vacuum heat preservation pipeline and a conveying pipeline, so that the supercharged low-temperature nitrogen is converged with nitrogen produced by the air separation device, then enters the heat exchanger, is subjected to heat exchange with positive flow air in the heat exchanger, is reheated and then is discharged out of the cold box, and therefore the purpose of recycling cold energy is achieved.

The invention relates to the technical field of extremely low temperature, in particular to a gas adsorption type rapid cooling system and method for an extremely low temperature system. The system comprises a refrigeration mechanism, the refrigeration mechanism comprises a refrigeration unit, and the gas adsorption type rapid cooling system for the extremely low temperature system further comprises an inner shell arranged outside the refrigeration unit in a covering mode, a middle shell arranged outside the inner shell in a covering mode and an adsorber arranged in the inner shell. The adsorber is internally provided with activated carbon or an MOFs (Metal-Organic Frameworks) adsorption material; liquid helium is arranged between the inner shell and the middle shell, and the inner shell is filled with helium with the pressure ranging from 0.1 Pa to 10 Pa. The cooling time of the ultra-low-temperature refrigerating system is shortened by more than half compared with that of a traditional cooling method, and meanwhile extra heat leakage is not caused at the ultra-low temperature.

The invention relates to the technical field of extremely low temperature, in particular to a passive thermal switch, a rapid cooling dilution refrigerator and a rapid cooling method.The passive thermal switch comprises a graphite rod body, a hot end connecting piece and a cold end connecting piece, and the graphite rod body is of a solid rod-shaped structure; the hot end connecting piece is arranged at one end of the graphite rod body and used for being connected with a hot end flange. The cold end connecting piece is arranged at the other end of the graphite rod body and used for being connected with a cold end flange. According to the passive thermal switch, the graphite material has very high thermal conductivity in a high-temperature area and very low thermal conductivity in an extremely low-temperature area, so that rapid cooling in a low-temperature area and good thermal isolation at extremely low temperature can be realized, and compared with a traditional active thermal switch, the passive thermal switch has the advantages that the graphite material is directly used as the thermal switch due to the thermophysical property of the graphite material; compared with the prior art, a complex structure and a complex technological process are avoided, the switch ratio is higher, the thermal response speed is higher, and meanwhile the risk of heat leakage at extremely low temperature is smaller.

The invention relates to the field of industrial waste gas purification, environmental protection and energy, and discloses a device for deeply recovering escaped ammonia. According to the device, through respective independent double-channel design of'heating medium conduction and composite cooling ', high-temperature flue gas (100-120 DEG C) is rapidly cooled to a temperature below a dew point (45-95 DEG C), escaped ammonia is dissolved in water separated from the flue gas by utilizing the characteristic that ammonia gas is easily dissolved in water, the ammonia escape concentration is reduced to be below 10 mg / m from 800-15 mg / m, and the environmental protection requirement is met. The composite cooling technology comprises three stages of air cooling, water cooling and phase change heat transfer, and the cooling efficiency per unit water volume is improved by 3-5 times. Meanwhile, an intelligent control system is arranged, the dew point temperature (+ / -0.5 DEG C precision) is dynamically tracked, the spraying amount (the flow control precision is + / -2%) is adaptively adjusted, and stable operation of the device is ensured. The problems that a traditional low-temperature SCR technology is high in investment, large in energy consumption, insufficient in ammonia recovery rate under complex working conditions and the like are solved.

The application provides a controllable nuclear fusion helium cryogenic system coupled with liquid air energy storage, belonging to the cross field of controllable nuclear fusion device cryogenic technology and large-scale energy storage technology, comprising an energy storage subsystem, an energy release subsystem, an 80K helium gas circulation subsystem, a cooling oil subsystem and a cold supplementing subsystem; the energy storage subsystem is used for liquefying ambient air and storing the ambient air in a liquid air storage tank, and shares multiple heat exchangers with the 80K helium gas circulation subsystem; the energy release subsystem takes liquid from the liquid air storage tank and exchanges heat with the 80K helium gas circulation subsystem; the 80K helium gas circulation subsystem drives helium gas through a cold compressor to ensure continuous cooling of a superconducting magnet cold shield; the cooling oil subsystem is used for cooling compressed air of the energy storage subsystem; and the cold supplementing subsystem is a closed inverse Brayton cycle, and cold energy of the cold supplementing subsystem is used for re-liquefying main air flow to compensate for system cold energy loss. The application provides a passive cold energy backup structure for the 80K cryogenic system, which does not depend on power grid power supply.

The present application relates to the technical field of low temperature, disclose a kind of fault early warning diagnosis method, device and program product of hydrogen liquefaction system, the present application is by obtaining the operating characteristic parameter set of hydrogen liquefaction system, the first parameter set of helium compressor equipment and the second parameter set of helium oil separation and circulating cooling system, realize the comprehensive monitoring of hydrogen liquefaction system and its key subsystem.Further, the representative urgency, sudden accident prediction is combined with the risk causing accident prediction with accumulation effect, both pay attention to the sudden accident scene in system debugging process, also consider the risk accumulation in long-term operation, can more comprehensive, accurate, effectively assess the operating condition of hydrogen liquefaction system, fill the blank of lack of comprehensive fault early warning diagnosis in prior art.

This invention discloses a sodium-ion battery cathode material prepared using cryogenic technology and its preparation method, relating to the field of sodium-ion battery technology. The cathode material, prepared using cryogenic technology, comprises a substrate and a coating covering the surface of the substrate. The substrate comprises the following components: 70-80 parts of positive electrode active material, 1-5 parts of conductive agent, 5-15 parts of binder A, and 30-45 parts of solvent A. The coating comprises the following components: 5-8 parts of conductive agent, 3-5 parts of binder B, 2-5 parts of corrosion inhibitor, 1-2 parts of transition metal salt compound, and 15-20 parts of solvent B. By introducing a corrosion inhibitor with a specific chemical structure combined with the coating design, a uniform and dense protective layer is formed on the electrode surface, effectively isolating it from electrolyte corrosion. The corrosion inhibitor core consumes corrosive substances through passivation and reversible redox reactions, significantly slowing down the interfacial corrosion rate, especially under long-term cycling and harsh environments.

To provide a carbon dioxide solidification system capable of continuous processing in short time using cold at a cryogenic temperature.SOLUTION: A carbon dioxide solidification system 1 comprises: an air liquefaction device 30 which generates liquefied nitrogen containing gas by cooling gas containing nitrogen; a carbon dioxide solidification drum 70 which solidifies carbon dioxide in a gas phase by mixing the liquefied nitrogen containing gas and carbon dioxide containing gas; a liquefied nitrogen gas containing gas supply line which supplies the liquefied nitrogen containing gas generated by the air liquefaction device 30 to the carbon dioxide solidification drum 70; a carbon dioxide containing gas supply line which supplies the carbon dioxide containing gas to the carbon dioxide solidification drum 70; a dry ice discharge line 181 which externally discharges solidified carbon dioxide generated in the carbon dioxide solidification drum 70; and a surplus cold gas discharge line 182 which externally discharges surplus cold gas that has not undergone solidification in the carbon dioxide solidification drum 70.SELECTED DRAWING: Figure 1

The utility model belongs to the technical field of separation, and particularly relates to a multistage membrane separation device for helium extraction, which comprises a primary membrane separator and a gas inlet pipe, and a separation mechanism and a mixing mechanism are arranged on the side edge of the primary membrane separator. According to the multistage membrane separation device for helium extraction, the separation mechanism is arranged, so that the membrane separation working pressure reaches a proper degree, the raw material natural gas does not need to be decompressed, the pressure of the natural gas is reduced in the helium extraction process, the natural gas is not consumed, the output of the natural gas is not influenced, the investment is greatly reduced, and the operation cost is lower; the problems that in the extraction process of a device provided in the background art, due to the fact that the helium content in helium-containing natural gas is low, helium is extracted from helium purely through a cryogenic technology, and the energy consumption of non-helium components such as methane is huge are solved, by arranging a mixing mechanism, in the catalytic dehydrogenation process, a dehydrogenation agent and helium can be fully mixed, and the energy consumption is greatly reduced. The dehydrogenation efficiency is improved, and the mixing mechanism is simple in structure and easy to operate.

The utility model relates to the technical field of refrigeration and low temperature, and provides a combined type thermal switch and a refrigerator, the combined type thermal switch comprises a thermal switch body and a plurality of superconductive layers, and the thermal switch body is provided with a hot end and a cold end which are oppositely arranged; the first superconducting layer is arranged on the end face of the hot end and tightly attached to the end face of the hot end. The second superconducting layer is arranged on the side, away from the hot end, of the first superconducting layer, and the first superconducting layer and the second superconducting layer are arranged in a stacked mode; wherein the superconducting transition temperature of the first superconducting layer is lower than that of the second superconducting layer. According to the refrigerator, heat leakage generated when the heat switch is switched off is reduced, the refrigerating capacity of the refrigerator is greatly reduced, the refrigerator can obtain the lower refrigerating temperature, and the refrigerating capacity is also improved at the same temperature.

The invention relates to a method for treating a used or defective photovoltaic panel (1) comprising: a) supplying a panel (1) comprising: a protective glass layer (2), a first cohesive layer (5) of a first polymer material, a layer (3) having a plurality of photovoltaic cells, a second cohesive layer (6) of a second thermoplastic polymer material having a glass transition temperature Tg, and a support plate (4) comprising at least a third polymer material; b) separating the support plate from a first assembly (7) by cryogenics, consisting of the stack of the remaining layers; c) separating the protective glass layer (2) from the first assembly (7) of step b), forming a second assembly (8); d) heat-treating the second assembly (8), forming a residue comprising components from the photovoltaic cells. Figure to be published with the abstract: Fig. 1

The present invention discloses a hydrogen or helium throttling liquefaction system using direct current (DC) flow from the cold and hot ends of the regenerative cryocoolers, which belongs to the technical field of refrigeration and cryogenics. It includes a regenerative cryocooler module, a hot-end DC flow module, a cold-end DC flow module, a throttling liquefaction module, and a gas-phase circulation module. The modules are interconnected to form a closed loop for the flow of hydrogen or helium working fluid. DC flow is introduced from the cold and hot ends of the regenerative cryocooler through the DC flow pipelines and DC flow valves. The hot-end DC flow exchanges heat with the reflowing low-temperature working fluid and is cooled down. After that, it mixes with the cold-end DC flow and enters the throttling liquefaction module to generate liquid phase through throttling and liquefaction. After the liquid phase has output cooling capacity, it flows through the gas-phase circulation module and then enters the back-pressure chamber of the compressor to complete the cycle. Compared with the existing small-scale hydrogen and helium liquefaction technology using regenerative cryocoolers, the present invention has the advantages of simple structure, easy installation, high heat transfer efficiency and liquefaction efficiency of the system.

The present application belongs to the field of aerodynamic cryogenic technology, and particularly relates to a method for manufacturing fluorescent microfilaments for low-temperature high Reynolds number transonic wind tunnels. The method comprises the following steps: soaking silk soaked in warm water in a fluorescent solution with a set proportion; soaking the silk in a color fixing solution for color fixing; rinsing the fluorescent silk after color fixing; soaking the fluorescent silk in a softener and an anti-static liquid; rinsing the fluorescent silk after anti-static treatment; and naturally ventilating and drying the fluorescent silk to obtain fluorescent microfilaments. The fluorescent microfilaments manufactured by the method have high luminous efficiency and strong flow field following property, are suitable for low-temperature high Reynolds number high-speed wind tunnels with wide temperature range and high and low speed environment, and have strong engineering application prospect, thus providing strong support for surface dynamic flow structure display of advanced aircrafts in deep low-temperature environment.

The invention relates to the technical field of low temperature, and discloses a fault early warning diagnosis method and device for a hydrogen liquefaction system and a program product. The fault early warning diagnosis method comprises the steps that an operation characteristic parameter set of the hydrogen liquefaction system, a first parameter set of helium compressor equipment and a second parameter set of a helium oil separation and circulation cooling system are obtained; and comprehensive monitoring of the hydrogen liquefaction system and key subsystems thereof is realized. Furthermore, representative urgent and sudden accident prediction and risk cause accident prediction with an accumulation effect are combined, an accident scene in the system debugging process is concerned, risk accumulation in long-term operation is considered, the operation condition of the hydrogen liquefaction system can be evaluated more comprehensively, accurately and effectively, and the system debugging efficiency is improved. And the blank of lack of comprehensive fault early warning diagnosis in the prior art is filled.

The invention relates to the technical field of low temperature, and discloses an evaporation safety assessment method for a liquid hydrogen storage tank, which comprises the following steps of: establishing safety judgment standards from two core dimensions of pressure and temperature, focusing a rate upper limit and a frequency spectrum energy characteristic on the pressure dimension, and considering an amplitude upper limit and evolution coordination on the temperature dimension; furthermore, the characteristic difference of fast pressure transient response and thermal inertia of temperature in the evaporation process of the liquid hydrogen storage tank can be accurately captured, and the pertinence and comprehensiveness of safety evaluation are improved. Furthermore, through safe judgment logic of two dimensions of pressure and temperature, no omission risk of the evaporation state of the liquid hydrogen storage tank is ensured, and stable operation of the storage system is ensured. Furthermore, through cooperative monitoring and judgment of pressure and temperature indexes, the abnormal evaporation trend caused by the Taxnius oscillation effect can be recognized in the early stage of the self-pressurization stage, sufficient time is reserved for safety intervention such as pressure release valve operation, sudden overpressure release is effectively avoided, and economic losses and potential safety hazards are reduced.

The invention relates to the technical field of refrigeration and low temperature, in particular to an AI energy-saving intelligent control method and system, and provides the AI energy-saving intelligent control method in order to solve the problems of how to start and stop a defrosting device according to needs through AI vision and how to achieve energy conservation and consumption reduction through peak and valley electricity prices. Comprising the steps of obtaining historical operation data of a target refrigeration house, monitoring the internal environment of the target refrigeration house in real time, and calculating the frosting rate of the target refrigeration house according to the historical operation data and the internal environment; the external environment of the target refrigeration house is monitored in real time, a door opening event of the refrigeration house is obtained, the frosting rate is corrected according to the door opening event and the external environment, and the correction rate is obtained; the real-time frosting degree of the target refrigeration house is obtained according to the real-time image; and defrosting threshold values corresponding to different electricity price time periods are set according to the historical operation data and the historical electricity price data, and the defrosting state is determined according to the comparison result of the frosting threshold values and the real-time frosting degree.

The invention relates to the technical field of low temperature, and provides a mechanical thermal switch and a low-temperature system. The screw rod is static relative to the fixing assembly in the first direction; the movable block is provided with a threaded hole, the periphery of the screw rod is sleeved with the movable block, and the movable block is in threaded connection with the screw rod; the pair of multi-connecting-rod mechanisms is hinged to the two sides of the moving block respectively, and the multi-connecting-rod mechanisms are hinged to the fixing assembly; the clamping blocks are correspondingly hinged to the multi-connecting-rod mechanisms respectively; under the rotating action of the screw rod, the moving block moves in the first direction, and the moving block can drive the pair of clamping blocks to be opened and closed in parallel in the second direction through the multi-connecting-rod mechanism. According to the mechanical thermal switch and the low-temperature system provided by the invention, through parallel opening and closing of the clamping blocks, uniform stress on the contact surface is ensured, the clamping blocks are driven by the screw, the clamping torque is increased, and the heat conduction efficiency can also be improved.

The utility model relates to the technical field of profound hypothermia, and provides a precooling device and a whole pulse tube refrigerator, the precooling device comprises a first cooling module used for cooling a compressor, the first cooling module comprises a first support base and a plurality of cooling blocks, the plurality of cooling blocks wrap the periphery of the compressor, and liquid nitrogen is stored in the cooling blocks; the first supporting base is arranged at the bottom of the cold block and used for fixing the cold block and insulating the cold block and the vacuum box. The second cooling module is used for cooling the hot end flange and the phase modulation mechanism, the second cooling module comprises a liquid nitrogen tank and a second supporting base, the liquid nitrogen tank is used for cooling the hot end flange and the phase modulation mechanism, and the second supporting base is used for insulating heat of the liquid nitrogen tank and the vacuum box. According to the utility model, the whole pulse tube refrigerator can be pre-cooled to a liquid nitrogen temperature zone, and the laser displacement sensor can monitor the running state of the compressor.

The present application relates to the field of low temperature technology, and discloses a sloshing effect alleviation control method for a low-temperature working medium buffer storage tank, wherein different sloshing effect identification indexes of the buffer storage tank in passive evaporation state and disturbance evaporation state are determined by different potential working medium categories facing the buffer storage tank, and further, different sloshing effect identification indexes and different cold insulation layer categories are combined to control and alleviate the sloshing effect of the buffer storage tank in passive evaporation state and disturbance evaporation state respectively. Therefore, by implementing the present application, different identification indexes for measuring the sloshing effect are formulated differently by considering different potential working media, different evaporation states, and dynamic processes of evaporation and liquid introduction and discharge operation of the hydrogen liquefaction station, and then the sloshing effect of the buffer storage tank can be evaluated and alleviated in a clear and targeted manner, and the operation efficiency and safety benefits of potential working medium buffer storage of the hydrogen liquefaction station are improved to a certain extent.

The present application relates to aerospace or vacuum cryogenic technology field, especially to a kind of parallel robot temperature control device for under vacuum cryogenic environment, including upper platform heat preservation cover, lower platform heat preservation cover, multilayer heat insulation component, temperature sensor, heating sheet and heat insulation pad;Upper platform heat preservation cover is installed on upper platform, and lower platform heat preservation cover is installed on lower platform;By the setting of parallel robot temperature control device, several heating zones are formed in parallel robot, and temperature sensor is arranged in each heating zone;Telescopic rod is connected with upper platform through the joint of upper hinge, and telescopic rod and motor are fixed on motor support, and motor support is connected with lower platform through the joint of lower hinge;Provided temperature control device can effectively solve the technical problems of large stroke, large angle fast motion of parallel robot under vacuum cryogenic environment, many movable joints, unfixing position of bare position, unable to be covered by multilayer heat insulation component, and further cause serious heat leakage, and high temperature control difficulty.

The invention provides a low-temperature leakage detection method, device and system for a 2K negative-pressure heat exchanger, belongs to the technical field of refrigeration and low temperature, and aims to solve the problems that leakage rate performance of the 2K negative-pressure heat exchanger in a deep low-temperature environment cannot be accurately evaluated and the leakage rate of the heat exchanger under design pressure cannot be measured by normal-temperature helium mass spectrum leakage detection. According to the low-temperature leakage detection method, device and system for the 2K negative-pressure heat exchanger, the leakage rate performance of the 2K negative-pressure heat exchanger in a deep low-temperature environment can be accurately evaluated, and the influence of rapid cooling on the sealing performance of equipment is analyzed and tested. And meanwhile, automatic loading and unloading of the 2K negative pressure heat exchangers are supported, online synchronous detection of multiple heat exchangers can be realized, and the processing efficiency and the yield of the heat exchangers are greatly improved.

This invention pertains to superconducting cryogenic technology and relates to a liquid helium Dewar micro-perturbation zero-evaporation cooling system. Liquid helium is selected as the cooling medium, and utilizing the siphon principle, a closed-loop circulation system is formed by the main installation chamber for the cryogenic instruments, the secondary installation chamber for the refrigerator, the liquid helium connecting pipe, and the evaporated helium recovery pipe. This system is used to cool the coil of the superconducting cryogenic current comparator and the superconducting quantum interference device (QFID). The circulation system is placed within an outer cylinder. The main installation chamber contains an equipment passage, and a well-like structure is located on the western side of the equipment passage. The superconducting cryogenic current comparator coil and the superconducting QFID are installed in a shielded box and embedded in the well-like structure. The top of the well-like structure has a through-hole connecting the liquid phase space and the gas phase space of the equipment passage. The lower surface of the refrigerator's cold head is located above the liquid helium surface, and the vertical distance between it and the upper surface of the well-like structure is at least 100 mm. This invention features low cost and high liquid helium utilization.

The utility model belongs to the technical field of petrifaction and coal chemical industry, and particularly relates to a refrigerant refrigeration VOC (volatile organic compound) purifying, recycling and recycling device which comprises a drying and cooling unit and a separating unit, and the drying and cooling unit comprises a mixed refrigerant compressor, a VOC compressor, a dryer, a main heat exchanger, a normal-temperature purified nitrogen pipe network and a normal-temperature recycled oil pipeline. According to the VOC characteristics of atmospheric storage tanks of petroleum and petrochemical industry and coal chemical industry, low-temperature condensation purification VOC treatment is carried out by using a cryogenic technology, the atmospheric storage tanks comprise an oil product storage tank or a methanol storage tank and the like, so that purification recovery and cyclic utilization of VOC are realized, and zero emission of VOC is realized. Components of the mixed refrigerant can be adjusted according to actual conditions, so that the device adapts to changes of production conditions and flexibly deals with different VOC treatment, and good purification and recovery effects can be achieved.

The application relates to an ultra-low-temperature refrigeration system and a refrigeration method thereof, which comprises a Stirling refrigeration unit and an adiabatic demagnetization refrigeration unit coupled with the Stirling refrigeration unit; the Stirling refrigeration unit comprises a pulse tube cold finger unit connected with the adiabatic demagnetization refrigeration unit and a pulse tube compressor unit connected with the pulse tube cold finger unit, wherein the pulse tube compressor unit is used for driving the pulse tube cold finger unit to refrigerate, the pulse tube cold finger unit is used for refrigerating to provide pre-cooling refrigeration capacity for the adiabatic demagnetization refrigeration unit, and the adiabatic demagnetization refrigeration unit is used for realizing refrigeration based on a magnetocaloric effect; the ultra-low-temperature refrigeration system directly combines a long-life Stirling type architecture with the adiabatic demagnetization refrigeration, fully utilizes the advantages of the Stirling type refrigeration machine and the adiabatic demagnetization refrigeration system, can greatly reduce the complexity of space ultra-low-temperature technology, and further improves the efficiency of the whole system.

This invention discloses a liquid nitrogen and liquid oxygen / liquid argon coupled power generation and cryogenic technology, belonging to the fields of new energy power generation and cryogenic refrigeration. Based on the prior patent application CN202410774560.6 (a temperature difference and pressure difference coupled power generation and refrigeration technology), the working fluid and equipment are further optimized. Utilizing the different physical properties of liquid nitrogen and liquid oxygen / liquid argon in their saturated states—different pressures at the same temperature and different temperatures at the same pressure—a temperature gradient and a pressure gradient always exist. Under the action of the heat exchange coil, the two working fluids maintain a low temperature difference and a large pressure difference. Using the pressure difference potential energy, octafluoropropane liquid flows, driving a cryogenic turbine to generate electricity, while the temperature of both working fluids gradually decreases. Then, using a room temperature heat source or cryogenic waste heat, the low-pressure working fluid (liquid oxygen / liquid argon) is heated, the pressure difference reverses, and octafluoropropane flows in the opposite direction, driving an axial-flow turbine to continue generating electricity (rotation unchanged), while the medium returns, completing the cycle of power generation. Simultaneously, the liquid oxygen / liquid argon cools or condenses the external heat source, supplying cold energy to the outside world or being used for liquefied natural gas, liquefied air, etc.

This invention provides a method, apparatus, and system for cryogenic leak detection of 2K negative pressure heat exchangers, belonging to the field of refrigeration and cryogenic technology. It aims to solve the problems that room-temperature helium mass spectrometry leak detection cannot accurately assess the leakage rate performance of 2K negative pressure heat exchangers in deep cryogenic environments, and cannot measure the leakage rate of heat exchangers under design pressure. The cryogenic leak detection method, apparatus, and system provided by this invention can accurately assess the leakage rate performance of 2K negative pressure heat exchangers in deep cryogenic environments and analyze the impact of rapid cooling on the sealing performance of the equipment. Simultaneously, it supports automatic loading and unloading of 2K negative pressure heat exchangers and enables online synchronous testing of multiple heat exchangers, significantly improving the processing efficiency and yield of heat exchangers.

The application discloses a hydration treatment method of low-creeping anode foil, and belongs to the technical field of aluminum electrolytic capacitor anode foil. The method adopts the way of grading water boiling and adding low-concentration citric acid to improve the quality of the hydration film, and introduces an ultralow-temperature technology treatment between two-stage water boiling, so that the problem of increased power consumption of products caused by the citric acid water boiling technology can be effectively solved. Compared with the existing mixed acid formation process in the industry, the power consumption is similar, the capacity is 3% lower, and the leakage current is reduced by 50%. The application provides a method which can combine the liquid nitrogen ultralow-temperature technology with the citric acid grading water boiling, so that the leakage current of the anode aluminum foil is lower under the premise of ensuring normal production, and the service life is prolonged.

The invention relates to the technical field of low temperature, in particular to a low-temperature pipeline heat leakage testing system and method. The embodiment of the invention provides a low-temperature pipeline heat leakage testing system which comprises a phase separator, a to-be-tested pipeline and a phase change pipeline. The phase separator is used for separating a low-temperature medium into a liquid phase and a gas phase, an inlet of the to-be-detected pipeline is connected with a liquid phase outlet of the phase separator, the phase change pipeline is connected to an outlet of the to-be-detected pipeline, and the phase change pipeline is provided with at least one heating device. The phase change pipeline is provided with at least one ribbon-shaped superconducting material along the axial direction, and the superconducting material is connected with a resistance testing device. The embodiment of the invention provides a system and a method for testing heat leakage of a low-temperature pipeline, which can improve the accuracy of testing a heat leakage value by an enthalpy difference method.

The present invention discloses a helium-3 gas purification device, which relates to the fields of cryogenic technology, energy, and safety detection technology. The helium-3 gas purification device includes a main body, a gas processing unit, a primary cooling unit, and a secondary cooling unit. The main body defines a vacuum chamber. The two ends of the gas processing unit are arranged outside the main body, and the middle part of the gas processing unit is arranged in the vacuum chamber. The gas processing unit is used to purify the helium-3 gas mixture. The primary cooling unit is arranged in the vacuum chamber, and the primary cooling unit is used to cool the helium-3 gas mixture to a first preset temperature. The secondary cooling unit is arranged in the vacuum chamber, and the secondary cooling unit is used to cool the helium-3 gas mixture to a second preset temperature, which is lower than the first preset temperature, and the second preset temperature is not greater than 10K. The helium-3 gas purification device of the present invention can achieve multiple and efficient helium-3 purifications, and the device is simpler, requires fewer supporting auxiliary equipment, and the working process is less time-consuming, thereby saving manpower and equipment costs.