67 results about "Gaseous nitrogen" patented technology

The invention provides an intelligent gamete and embryo storage management system for a reproductive center, which comprises a heat preservation module, a liquid nitrogen storage module, a liquid nitrogen storage module, a liquid nitrogen storage module and a liquid nitrogen storage module which are connected with one another, the liquid nitrogen recycling module is used for recycling, separating and purifying gaseous nitrogen by utilizing a condenser and a closed-loop pipeline; the intelligent monitoring module is used for monitoring the liquid nitrogen tank in real time by using various sensors, processing and analyzing monitoring data, and calculating and judging whether the current state is a safe state or not; the analysis and prediction module is used for calculating the fault probability of the liquid nitrogen tank by utilizing a machine learning model; according to the high-density storage module, a multi-layer storage frame, a single-tube container and a multi-tube container are installed in the liquid nitrogen tank; and the centralized management module is used for constructing a sample file and remotely monitoring the real-time state and abnormity of the liquid nitrogen tank. Liquid nitrogen volatilization can be reduced to the maximum extent, the sample safety is guaranteed, the storage efficiency is improved, and the increasing requirements of test tube babies are met.

The invention provides a method for synthesizing low-oxygen high-alpha-phase silicon nitride powder through direct nitridation of silicon sawdust, and belongs to the technical field of silicon nitride preparation. The method comprises the following steps: carrying out acid pickling, impurity removal and purification treatment on silicon sawdust to obtain a silicon raw material of which the main metal impurities are less than 10ppm and the oxygen content is less than 2%; the silicon raw material and a regulator are mixed according to a preset proportion and subjected to ball milling treatment, a mixed material is obtained, and the regulator comprises sodium chloride and carbon powder; introducing a gaseous nitrogen source, and carrying out vacuum gradient heating nitridation treatment on the mixed material to obtain a silicon nitride crude product; and sequentially carrying out acid pickling, solid-liquid separation, cleaning and drying post-treatment on the silicon nitride crude product to obtain the low-oxygen high-alpha-phase silicon nitride powder. According to the invention, the silicon sawdust is subjected to pickling purification, and the obtained silicon sawdust is directly nitrided at low temperature under the assistance of sodium chloride and carbon powder to synthesize alpha-phase silicon nitride; and then the high-dispersion and high-purity alpha-phase silicon nitride powder can be obtained through an acid pickling-water washing-drying process. The silicon nitride product prepared by the method can be used as a raw material of silicon nitride ceramic.

The application discloses a kind of organic waste composting methods for reducing nitrogen loss, belong to the technical field of organic waste resource utilization, in different stages of organic waste fermentation, calcium peroxide is added, on the one hand, can maintain the oxygen environment of heap system, inhibit denitrification;On the other hand, by regulating the pH environment in system, reduce ammonia volatilization.This double synergistic effect, continue to increase efficiency in the whole composting fermentation process, oxygen regulation breaks down the gaseous nitrogen loss caused by denitrification from the root, pH regulation effectively inhibits free ammonia volatilization, the two effects cooperate with each other, throughout the whole process, can realize the efficient nitrogen conservation of organic waste raw materials from fermentation start to stable decomposition, effectively solve the problems that existing nitrogen conservation technology is not good, cost is high, easy to cause secondary pollution and affect composting maturity etc..

The invention discloses a method for reactive sputtering of a metal nitride diffusion coating based on a plasma technology, and belongs to the field of metal surface treatment. The method comprises the following steps: (1) placing a metal substrate material on a sample table, and placing a hollow conductive mesh enclosure around the sample table as an active screen cathode; (2) forming a multi-layer hollow cathode system by using a hollow target material composed of target metal elements, and placing the multi-layer hollow cathode system on a hollow conductive mesh enclosure; and (3) the ionization atmosphere serves as the reaction atmosphere, a chemical diffusion coating is formed through gaseous nitrogen source reactive sputtering, and the target element forms the metal nitride diffusion coating on the surface of the base body through ionization and reactive sputtering. According to the method, the utilization rate of sputtering particles is increased through the hollow cathode effect, diffusion and permeation of the nitrogen element are promoted, the reaction sputtering activity is improved by adding a gas nitrogen source, the reaction with a matrix is facilitated, a more compact and uniform TiN coating is generated, the metal nitride diffusion coating is successfully prepared on the surface of the substrate, and the service life of the substrate is prolonged. And excellent high bearing capacity, corrosion resistance and wear resistance are achieved.

This process for cryogenic air separation and the respective air separation plant use a high-pressure column (101), high-pressure column (101) and low-pressure column (102), a usual main condenser (103) and a crude argon column (107a / b / c) connected to the low-pressure column (102) at a first intermediate position, the argon transition. A second nitrogen top gas (40) is withdrawn from the top of the low-pressure column (102) and used as recycle nitrogen (41, 42, 44,47,48), recycled nitrogen (48) being introduced in gaseous form (48) into the high-pressure column (101) and / or into the main condenser (103) and / or into a bottom reboiler of a separation column (81,77). The air separation plant further comprises a medium-pressure column (104) being operated at intermediate pressure and fed by a first oxygen-enriched fraction (33, 34) from the high-pressure column (101) is introduced as feed into the medium-pressure column (104). A portion (38) of the argon transition fraction is introduced as heating medium into a bottom evaporator (106) of the medium-pressure column (104). A first portion (362) of the third nitrogen top gas (361) from the medium-pressure column (104) in gaseous form, warmed in the main heat exchanger (9) und finally withdrawn as gaseous nitrogen product (UHPGAN). A second portion (53) of the third nitrogen top gas (361) is liquefied in the top condenser (105) of the medium-pressure column (104) and used as reflux in the medium-pressure column (104). A second oxygen-enriched fraction is withdrawn from the medium-pressure column (104) and introduced into the top condenser (105) of the medium-pressure column (104) as cooling medium (38). At least a portion of the oxygen-enriched gas (36) produced in the top condenser (10) is introduced into the low-pressure column (102) at a second intermediate position at least 25 theoretical trays above the first intermediate position.

A method of controlling nitrogen and oxygen content of synthetic air is disclosed. The method may include decomposing nitrous in a decomposition system by expanding liquid nitrous into gaseous nitrous in a decomposition chamber. A gaseous mixture of oxygen gas (O2), transient oxygen atoms (O), nitrogen gas (N2), and / or transient nitrogen atoms (N) may be obtained from the decomposition. The gaseous mixture may be provided to a test chamber that is at least initially devoid of receiving an additional nitrogen gas (N2) from either an N2 supply or a reservoir of air and / or at least initially devoid of receiving additional oxygen gas (O2) from the reservoir of air. The test material may be exposed to the gaseous mixture in the test chamber. A response of the test material to the gaseous mixture may be determined.

The utility model provides a cold energy recovery system, which comprises a gasification device, a cold energy recovery device and a cold energy recovery device, the cooling capacity storage device is connected with the gasification device and used for recycling the cooling capacity in the gaseous nitrogen, and a water supply pipe and a water return pipe are arranged on the cooling capacity storage device; the at least one terminal device is communicated with the cooling capacity storage device, the water supply pipe provides low-temperature water required by use for the terminal device, and the terminal device conveys the used water to the cooling capacity storage device through the water return pipe; the monitoring control device is connected with the cooling capacity storage device and the water supply pipe and used for monitoring the water temperature of the water supply pipe and controlling the flow of the gaseous nitrogen in the cooling capacity storage device; the temperature control valve is located on the water supply pipe and used for automatically adjusting water flow in the water supply pipe according to the monitored water temperature of the water supply pipe so as to maintain the water temperature in the water supply pipe within a preset range; and the cold energy is recycled and utilized in the liquid nitrogen gasification process, the effects of energy conservation and consumption reduction are achieved, and the application range is wide.

A simpler and lower-cost method and associated hardware are described for recovering biopharmaceutical products from cell factories in higher yields by a liquid nitrogen-based pre-treatment of cell factories followed by gentler disintegration of cellular factories by tunable, pressurizing and de-pressurizing cycle with gaseous nitrogen. The cell factories are heterologous expression systems and could be based on plant cells, mammalian cells, algal cells, yeast cells or even bacterial cells. The pre-treatment step with liquid nitrogen softens the tougher cell wall structures thus enabling cells to be disrupted relatively easily during the gaseous nitrogen-based pressurizing / depressurizing cycle. This invention can enhance the yield of biopharmaceutical products from expression systems and reduce the overall cycle-time and further down-stream processing and polishing cost of biopharmaceutical products.

A method and apparatus for obtaining pressurized nitrogen by cryogenic separation of air in a distillation column system. The distillation column system comprises a high-pressure column (4), a low-pressure column (6), a main condenser (5), and a top condenser (7) of the low-pressure column. The evaporation space of the top condenser (7) is in the form of a forced-flow evaporator. The high-pressure column (4) has a baffle section (8) arranged directly above the point where the feed air (3) is introduced, and has 1 to 5 theoretical or actual plates. The oxygen-enriched liquid stream (11) introduced into the low-pressure column (6) is withdrawn from the high-pressure column (4) above the baffle section (8). The purified stream (9A) is withdrawn below the baffle section (8) and removed from the distillation column system (9B). The gaseous nitrogen streams (26A, 26B) are heated in a counter-current subcooler (12) by indirect heat exchange with the oxygen-enriched liquid stream (11) from the high-pressure column (4) before being heated in the main heat exchanger (2).

A metal or ceramic layer may be deposited on nuclear materials by chemical vapor deposition using a non-halogenated liquid organometallic metal precursor. The chemical vapor deposition is carried out by a method including steps of introducing nuclear fuel particles into a fluidized bed reactor, and heating the fluidized bed reactor to a desired operating temperature T1. A flow of a carrier gas is initiated through a vaporizer, and the non-halogenated liquid organometallic metal precursor is injected into the vaporizer and vaporized. A first mixture of the carrier gas and the vaporized non-halogenated liquid organometallic metal precursor may be mixed with a gaseous carbon source, a gaseous nitrogen source, a gaseous oxygen source, or a mixture thereof to produce a second mixture; and the second mixture flows into the fluidized bed reactor at operating temperature T1, allowing deposition of a desired ceramic coating on the particles. The non-halogenated liquid organometallic metal precursor may be a compound of Zr, Hf, Nb, Ta, W, V, Ti, or a mixture thereof.

Use of microalgae extracts to inhibit nitrification or denitrification in soil The present invention finds application in the agricultural field and relates to the use of microalgae extracts to control nitrification in soils and reduce losses of gaseous nitrogen in the form of N2O. The invention also relates to a product for agricultural use comprising a microalgae extract and a method for fertilizing a soil. Figure for abstract: Fig. 1.

A process for supplying subcooled liquid CO2 to a site comprising a user station of this liquid CO2, from a liquid CO2 storage tank, site where there is a source of liquid nitrogen suitable for supplying gaseous nitrogen to a user station of this gaseous nitrogen, according to which: a first cooling of liquid CO2 taken from said CO2 storage is organized by heat exchange in an exchanger with liquid nitrogen taken from said nitrogen storage, and the CO2 thus subcooled to a first temperature is returned to the CO2 storage, the taking and the exchange being carried out when there is a demand for consumption of gaseous nitrogen by said nitrogen user station;the consumption of CO2 and nitrogen by said user stations may be synchronized or not, and in that when they are not synchronized, when there is a demand for consumption by the subcooled CO2 consuming station, liquid CO2 is taken from said CO2 storage and this taken CO2 is subjected to a second cooling, by heat exchange in said exchanger with liquid nitrogen taken from said nitrogen storage, to lower the temperature of the taken liquid CO2 to a second temperature, lower than the first temperature; then the liquid CO2 thus subcooled at this second temperature is directed to the user station of this CO2.;

The present application relates to the field of low temperature biological preservation technology, and particularly relates to a low temperature biological sample transportation storage tank, which comprises an inner tank body provided with a vacuum interlayer and a double-layer structure, an inner tank body is internally provided with a placing rack for fixing biological sample storage equipment, and further comprises an outer tank body provided outside the inner tank body and provided with a heat preservation layer between the inner tank body and the outer tank body; a placing pipe is provided on the inner tank body and used for leading to the inside of the inner tank body. A normally closed sealing mechanism is arranged at the bottom of the placing pipe, the opening operation of the mechanism is driven by a gear and a rack, and a cooling mechanism is synchronously driven. When the disadvantageous operation of opening the placing pipe to access the sample occurs, the higher temperature nitrogen gas in the upper part of the gas phase zone can be automatically drawn back into the liquid nitrogen to be cooled and condensed, the temperature of the gas phase zone is effectively reduced, and the thermal shock of the sample exposure is reduced. Meanwhile, the gaseous nitrogen gas is pressed back into the liquid nitrogen, the partial liquefaction of the gaseous nitrogen gas is promoted, and the loss of the liquid nitrogen caused by the opening operation is reduced.

A device for testing gas tightness of a cryogenic thermal insulation module and gas fluidity therein includes a gas / liquid inlet module, a gas / liquid discharge module and a thermal insulation module. The gas / liquid inlet module includes an inner-space liquid nitrogen inlet valve, an outer-space liquid nitrogen inlet valve, a low-pressure pressure control module, an inner-space high-pressure pressure control module, an outer-space high-pressure pressure control module, a buffer tank, a pressure relief valve and a filter, which are connected by a pipe. The gas / liquid discharge module includes a liquid / gaseous nitrogen discharge valve, an inner-space vent valve and an outer-space vent valve, which are connected by a pipe. An outlet of the gas / liquid inlet module is connected to an inlet of the thermal insulation module, and inlet of the gas / liquid discharge module is connected to an outlet of the thermal insulation module. The present invention can be used to inspect and investigate the tightness of a thermal insulation module under cryogenic and ambient conditions and to test and investigate gas fluidity therein.

A process for supplying sub-cooled liquid CO2 to a site comprising a user station for the liquid CO2, from a liquid CO2 storage tank, which site contains a source of liquid nitrogen that is able to supply gaseous nitrogen to a user station for the gaseous nitrogen.

The utility model provides a rapid nitrogen liquefying device which comprises a PSA (Pressure Swing Adsorption) nitrogen making machine, a cold insulation box, a liquefying module arranged in the cold insulation box and used for liquefying gaseous nitrogen, and a circulating cooling module communicated with the liquefying module and used for receiving nitrogen generated by the PSA nitrogen making machine. The non-liquefied nitrogen is conveyed and cooled; wherein nitrogen produced by the PSA nitrogen making machine is conveyed into the circulating cooling module, after being cooled by the circulating cooling module, the nitrogen is conveyed into the liquefying module to be liquefied, part of the nitrogen is liquefied by the liquefying module, part of the nitrogen returns to the circulating cooling module to be circularly cooled, and the liquefied nitrogen is discharged through the liquefying module to be stored. Nitrogen can be rapidly generated through the PSA nitrogen making machine, and part of cooled nitrogen is liquefied into liquid nitrogen to be discharged and stored through the arrangement of the liquefaction module and the circulating cooling module, so that the nitrogen is conveniently stored while the nitrogen is rapidly obtained.

The application discloses a heterotrophic nitrification-aerobic denitrification bacterium and application thereof in sewage denitrification treatment, and belongs to the technical field of microorganisms. Enterobacter asburiae The heterotrophic nitrification-aerobic denitrification bacterium is Enterobacter asburiae WZCH (WZCH), which was preserved in the China Center for Type Culture Collection on June 16, 2025, and the preservation number is CCTCC NO: M 2025272. The strain has high reduction capacity, can convert ammonia nitrogen, nitrate nitrogen and the like in sewage into gaseous nitrogen, has no nitro nitrogen accumulation, is green and environment-friendly, and has high practical application value.

A method for extracting copper from sulphide mineral ore, comprising the following steps: stacking the ore to form a pile (heap), a leaching step, irrigating the pile with a first irrigating solution containing an acidic nitrate solution and nitrite, thereby causing the oxidation of sulfide minerals inside the pile, oxidation of gaseous nitrogen oxide released during the oxidation of sulfide minerals inside the pile with oxygen to form nitrogen dioxide, and hydrolysis of nitrogen dioxide to form nitric acid and / or nitrous acid in the first irrigating solution inside the pile, to continue the leaching stage and reduce nitrogen oxide losses from the pile.

The invention generally relates to nitrogen fixation using reactions in water containing microdroplets. In certain aspects, the invention provides methods of producing ammonia that involve generating a water containing microdroplet in presence of gaseous nitrogen from a gas source, wherein the water containing microdroplet comprises a metal catalyst and the metal catalyst reacts with the gaseous nitrogen to produce ammonia, optionally including in situ derivatization.

The invention relates to a method for cryogenic air separation and a corresponding device. The distillation system has a high-pressure column (12, 13), a low-pressure column (24, 25) and a main condenser (26) operating as a condenser-evaporator. In the nitrogen recycle, a nitrogen-rich gas (27) is withdrawn from the low-pressure column and used as a recycle fraction, which is compressed in a recycle compressor and introduced (34) into the high-pressure column (13) at a first intermediate height (H1). A nitrogen fraction (17) from a second intermediate height (H2) higher than the first intermediate height (H1) is withdrawn from the high-pressure column and recovered as a medium-pressure nitrogen product (18). The high-pressure column is divided into a first portion (12) and a second portion (13) placed in two closely spaced containers. The compressed recycle fraction (34) is introduced into the second portion (13), and the medium pressure nitrogen product (17, 18) is withdrawn from the second portion (13). A gaseous nitrogen transfer fraction (15) is withdrawn from the top of the first portion (12) and introduced into the second portion (13) at a third intermediate height (H3) higher than the second intermediate height (H2). The liquid nitrogen transfer fraction (39) is withdrawn from a fourth intermediate height (H4) of the second stage, wherein the fourth intermediate height (H4) is equal to or slightly higher than the third intermediate height (H3). The liquid nitrogen transfer fraction is introduced into the first section at the top of the first section. The gaseous fraction is separated from a two-phase fraction produced by partial condensation of the nitrogen-rich overhead gas in the main condenser and used as a He-Ne pre-concentrate intermediate.

The embodiment of the present application provides a gas treatment system and a gas treatment method, the gas treatment system is used for treating byproduct gas containing nitric oxide; the gas treatment system comprises: a flow guide device used for guiding the flow of the byproduct gas; a first spraying device used for spraying an acidic denitration liquid to the byproduct gas in the process that the byproduct gas flows in the flow guide device; wherein the denitration liquid contains hydrogen ions and an oxidizing agent. Through the embodiment of the present application, the removal effect of nitric oxide in the byproduct gas is improved, and the content of gaseous nitrogen oxides in the byproduct gas is reduced.

The utility model discloses an air uniformizing structure capable of enhancing the air uniformizing effect in a cavity of a liquid nitrogen instant freezer. The air uniformizing structure comprises a food liquid nitrogen instant freezer body. Food conveyed through the conveying chain enters the liquid nitrogen instant freezer body, liquid nitrogen is preferentially sprayed into the liquid nitrogen vaporization layer through the liquid nitrogen spray head, and the exhaust fan sucks part of gaseous nitrogen to be discharged at the position of the feeding port in the device from the head of the tunnel and discharges the gaseous nitrogen to the liquid nitrogen vaporization layer. Mixed high-pressure gas in the liquid nitrogen vaporization layer is blown into the cold energy exchange layer at a high speed through the circulation holes, food materials in the cold energy exchange layer are evenly and quickly frozen, the effect of evenly discharging cold air of liquid nitrogen is achieved, and due to the fact that some food materials are small in size and cannot occupy too much space on the conveying chain, the food materials can be quickly and quickly frozen. And the arrangement distance of the food materials is large, at the moment, part of the circulation holes need to be blocked through the adjusting assembly, and therefore the effects that the gas exchange flow speed is increased, and the food materials are precisely frozen are achieved.

The invention belongs to the technical field of water treatment, and particularly relates to a low-carbon denitrification method for purifying and repairing an aquaculture water body. According to the method disclosed by the invention, a biological nitrogen removal system taking synchronous nitrification and denitrification as a core is constructed by directionally cultivating indigenous nitrogen removal flora in a water body and combining a special slow-release carbon source and a nitrogen removal catalyst, so that the conversion efficiency of harmful nitrogen forms such as ammonia nitrogen and nitrite into gaseous nitrogen is effectively improved; therefore, in-situ purification and resource utilization of nitrogen pollution are achieved in the breeding process. An ion balance environment beneficial to symbiosis of beneficial microorganisms and algae is constructed, so that cultured organisms are in a continuous and healthy growth environment, the disease occurrence rate is remarkably reduced, a green production mode that antibiotics, disinfectants and insecticides are rarely used in the whole culture process is achieved, and meanwhile the quality and safety of aquatic products are guaranteed. According to the method, a closed-loop culture mode of simultaneously culturing, purifying and repairing is realized, and the non-point source pollution pressure of aquaculture on the environment is effectively relieved.

The utility model relates to the technical field of heat exchangers, and discloses an electronic silicon low-temperature extraction heat exchanger which comprises a heat exchange tube, pull rods are fixedly connected to the right ends of the front side and the rear side of the outer wall of the heat exchange tube, the left side of the outer wall of the heat exchange tube is communicated with a barrel, and a tube plate is fixedly connected to the middle of the left side of the barrel. The left side and the right side of the bottom end of the outer wall of the heat exchange tube are fixedly connected with saddle type supports, the middle of the left side of the tube plate is fixedly connected with a tube box shell ring, and a sealing head is arranged in the middle of the left side of the tube box shell ring. In the utility model, the working condition of the heat exchanger is that silane is condensed by liquid nitrogen, and due to low temperature and high pressure, the tube plate is independently designed to be welded with the heat exchange tube in a groove welding manner, and the outer part of the heat exchange tube is reserved for 3mm to be welded with the tube head of the heat exchange tube, so that low-temperature gaseous nitrogen of the first-stage condenser enters the second-stage condenser to precool the silane, and the use amount of the liquid nitrogen is saved; the liquid nitrogen usage amount is reduced by 30% by using feedback data, the requirements of users are met, and the practicability of the heat exchanger is improved.

This invention discloses a silicon-based composite material, the general chemical formula of which is: Li x SiO y N z The parameters are: 0 < x < 20, 0 < y < 5, 0 < z < 10; lithium accounts for 2%–20% of the mass of the silicon-based composite material; nitrogen accounts for 0.1%–20% of the mass of the silicon-based composite material. Scanning electron microscopy of particle cross-sections shows that the microstructure of the silicon-based composite material is a multiphase dispersed structure, obtained by mixing gaseous raw materials, including gaseous silicon source material, gaseous lithium source material, and gaseous nitrogen source material. The average particle size D of the silicon-based composite material particles is... 50 Within the range of 1nm-100μm, the specific surface area is 0.5m². 2 / g-40m 2 The silicon-based anode material disclosed in this invention exhibits high initial coulombic efficiency and good cycle performance.

The invention discloses a heterotrophic nitrification-aerobic denitrification bacterium and application thereof in sewage denitrification treatment, and belongs to the technical field of microorganisms. The heterotrophic nitrification-aerobic denitrification bacterium is Enterobacter asbriae WZCH, is preserved in the China Center for Type Culture Collection on June 16, 2025, and has a preservation number of CCTCC (China Center for Type Culture Collection) NO: M 2025272. The invention further discloses a preparation method of the heterotrophic nitrification-aerobic denitrification bacterium. The strain has relatively high reducing capacity, can convert ammoniacal nitrogen, nitrate nitrogen and the like in sewage into gaseous nitrogen, is free of nitro nitrogen accumulation, is green and environment-friendly, and has relatively high practical application value.

The invention relates to the technical field of biological sample deep hypothermia automatic storage, in particular to a multi-channel automatic deep hypothermia biological sample storage device and system which comprises a liquid nitrogen tank, a rotating cage assembly, a lifting mechanism and an air curtain protection device. The liquid nitrogen tank adopts an inclined opening design, and the rotating cage is controlled by a driving system to rotate, so that the lifting basket reaches a target station. The lifting mechanism is provided with double lifting towers which correspond to independent access windows respectively, and double-channel synchronous lifting is achieved through a motor lifting module. The air curtain protection device gasifies nitrogen through liquid nitrogen to form an air curtain barrier covering the window. The control device receives an instruction through the data acquisition module, the processing module analyzes the instruction to generate a control signal, and the execution module adopts a PLC controller to synchronously operate the driving system and the lifting mechanism, so that sequential coupling of rotation of the rotating cage and lifting of the lifting basket is realized. According to the system, through a spatially isolated dual-channel architecture and a parallel control algorithm, the biological sample in-out warehouse efficiency is remarkably improved, and meanwhile, the stability of a deep hypothermia environment is maintained.

The invention relates to the field of Coriolis principle mass flow meters, in particular to a micro flow verification method of a Coriolis principle mass flow meter, which comprises the following steps of: changing a standard detected medium from water into high-purity nitrogen, and firstly measuring the mass flow of gaseous nitrogen in a standard state; measuring the temperature and the pressure of the nitrogen in the verification state, and obtaining the nitrogen density in the verification state and the nitrogen density in the standard state through table look-up; according to an ideal gas state equation, a nitrogen mass flow value in a verification state is obtained, and the flow value serves as a standard flow parameter and is compared with a flow value of the micro mass flow meter. According to the utility model, the volatilization influence during water medium verification is completely avoided, the wall-hanging delay phenomenon of water is also avoided, the flow verification time is greatly shortened, and the verification efficiency is improved.

A method of supplying subcooled liquid CO2 from a liquid CO2 storage tank to a venue of a subscriber station containing this liquid CO2, the venue containing a source of liquid nitrogen capable of supplying gaseous nitrogen to the subscriber station of the gaseous nitrogen:-arranging a first cooling of liquid CO2 extracted from the CO2 storage tank by heat exchange in an exchanger with liquid nitrogen extracted from the nitrogen storage tank, the CO2 which is supercooled to the first temperature is sent back to the CO2 storage tank, and the extraction and exchange are carried out when the requirement of the nitrogen user station for gaseous nitrogen consumption exists; -the consumption of CO2 and nitrogen by the subscriber station can or cannot be synchronized, and when they are not synchronized, when there is a need for consumption of supercooled CO2 by a consumption station, liquid CO2 is extracted from the CO2 storage tank and the extracted CO2 is secondarily cooled by heat exchange in the exchanger with liquid nitrogen extracted from the nitrogen storage tank, and when there is a need for consumption of supercooled CO2 by a consumption station. Cooling the extracted liquid CO2 to a second temperature lower than the first temperature; and then guiding the liquid CO2 cooled to the second temperature in this way to the consumer station of the CO2.

The invention relates to a method for recycling used batteries, in particular used lithium-ion storage batteries, comprising at least the following steps: - deep-freezing the used batteries in a deep-freezing step at temperatures of between -200 °C and -100 °C by supplying the used batteries with a liquid and / or gaseous fluid, in particular with liquid and / or gaseous nitrogen and / or CO2; - comminuting the used batteries in a deep-frozen state in a comminuting step; - vaporizing electrolyte liquid from the used batteries in a drying step; and - separating and sorting the parts of the comminuted used batteries into different classes in a separating step. The deep-freezing step takes place in a cooling vessel into which liquid and / or gaseous nitrogen is continuously supplied and from which gaseous nitrogen is continuously removed during the deep-freezing step.