245 results about "Nitrogen flow" patented technology

The invention discloses a component real-time control method and system for vacuum glow coating, and relates to the technical field of vacuum coating, firstly, in a holographic component collection stage, a sensor and monitoring equipment are used for collecting multi-dimensional data in a coating process in real time, and secondly, in a self-adaptive component adjustment stage, a chromium-nitrogen component prediction value in a vacuum cavity is calculated to obtain a chromium-nitrogen component prediction value; the concentration is compared with the target concentration to judge whether component adjustment is needed or not, then in the real-time strategy adjustment stage, when the components deviate from the target value, the nitrogen flow, bias voltage and target current are automatically adjusted through the equipment management platform to ensure the stability of the coating process, and finally, in the real-time film quality correction stage, the film quality is corrected. The film layer quality is quantified through an innovative calculation formula, the stability and consistency of chromium-nitrogen film coating are improved through closed-loop control, and the film coating process can be dynamically optimized so as to ensure that the final film layer quality meets the design requirement.

The invention discloses a low-smoke flame-retardant cable outer layer material, and a preparation method of key components and a high-entropy alloy nano material comprises the following steps: grinding cerous nitrate, ferric nitrate, manganous nitrate, sodium hexahydroxyplatinate and copper nitrate into particles according to a ratio of 2: 1: 1: 1: 1; then adding 10-20 times by mass of a 32% tannic acid solution and 5-8 times by mass of a 10% glutaraldehyde solution, carrying out an oil bath at 65-70 DEG C for a reaction for 4-8 h, then carrying out overnight vacuum freeze drying to obtain mixed powder, placing the mixed powder in a crucible of a muffle furnace, then calcining the mixed powder at 1000-1200 DEG C under the protection of nitrogen flow for 4-10 h, and finally cooling the calcined mixed powder to room temperature. And cooling. The prepared outer layer material for the cable overcomes the defects that a conventional cable easily releases a large amount of toxic smoke during combustion, is poor in flame retardant property and contains halogen to pollute the environment.

The invention relates to the technical field of vertical furnaces, in particular to a wafer loading and unloading chamber and a vertical furnace, which comprise a wafer boat, a filter, a heat exchanger, a return pipe, a fan and a heat energy absorption part, and in the process that the wafer descends into the wafer loading and unloading chamber along with the wafer boat, the low-temperature nitrogen flows out from the nitrogen outflow hole of the filter and flows to the wafer boat and the wafer. And carrying out cooling treatment on the wafer boat and the wafer by means of low-temperature nitrogen. And then the high-temperature nitrogen flows into the heat exchanger through the nitrogen recovery hole for cooling treatment. And the cooled nitrogen flows to the filter again through the return pipe under the action of the fan to be reused. By additionally arranging the heat energy absorption part, the heat energy absorption part can quickly absorb heat energy from the wafer boat, the wafer and the environment in the wafer loading and unloading chamber, so that the cooling rate of the wafer boat and the wafer is improved, the rising amplitude of the environment temperature in the wafer loading and unloading chamber is reduced, and the service life of other equipment in the wafer loading and unloading chamber is prolonged; and potential safety hazards are reduced.

The invention provides a refining method for increasing nitrogen in the vacuum process of a VD vacuum furnace, and relates to the technical field of ferrous metallurgy, the refining method comprises the following steps: S1, refining molten steel in an LF steel ladle by adopting nitrogen as bottom blowing gas; and S2, the molten steel obtained after LF ladle refining is placed in a VD vacuum furnace, nitrogen serves as bottom blowing gas, the nitrogen flow and the vacuum degree are adjusted in a multi-stage mode, and the nitrogen increasing operation is completed. A multi-stage adjustment mode is adopted, and the nitrogen content in the molten steel is controlled by controlling the nitrogen flow, the vacuum degree and the retention time.

The utility model relates to a gas diffusion cascade device for preparing high-abundance nitrogen-15 isotopes by taking nitrogen as a medium. The gas diffusion cascade device comprises a first gas diffusion cascade, a second gas diffusion cascade, a photocatalysis / electro-catalysis device and a high-speed magnetic suspension gas compressor, the first gas diffusion cascade and the second gas diffusion cascade are ladder cascade and respectively comprise a plurality of gas diffusion separation devices; the photocatalysis / electrocatalysis device is positioned between the first gas diffusion cascade and the second gas diffusion cascade; the high-speed magnetic suspension gas compressor is positioned in front of each gas diffusion and separation device in the nitrogen flowing direction; and obtaining the high-abundance nitrogen-15 isotope prepared by taking nitrogen as a medium from the heavy fraction end of the second gas diffusion cascade. The gas diffusion cascade device is high in separation coefficient, large in flow and high in efficiency, the prepared nitrogen-15 isotope abundance is high, and the gas diffusion cascade device is suitable for industrial application.

The invention provides a small biological sample library control method and system capable of being freely selected and matched, and relates to the technical field of control, and the method comprises the steps: detecting nitrogen concentration data, gas pressure data and temperature data in a sample library, building a temperature field distribution model, dividing a plurality of temperature independent control regions, and distributing a temperature number and a storage coordinate for each region; and establishing a coordinate database and a path database. And determining a target area according to the identification information and the temperature distribution map, and selecting an optimal transfer path. And the mechanical arm is controlled to transfer the sample along the optimal path, the clamping force is dynamically adjusted based on force feedback, the nitrogen flow is adjusted in real time according to the temperature gradient, and finally the sample storage position, temperature and sample identification information are recorded. Precise storage and efficient management of the samples are achieved, the safety and reliability of sample storage are improved, the operation cost of the sample library is reduced, in addition, the storage areas can be increased according to urban bureau requirements, and the conveying areas can also be correspondingly increased.

The invention discloses a solid-phase tackifying, cooling and humidifying system and a solid-phase tackifying, cooling and humidifying process for nylon. The cooling and humidifying of a slice are realized while a high-viscosity nylon slice is produced; on the basis of the prior art, a cooling function and a humidifying function are innovatively combined, and remarkable technical progress is achieved. According to the system, an interlocking control system of a cooling circulation nitrogen flow meter, a regulating valve and a temperature and dew point detector is additionally arranged on a cooling unit, so that dynamic regulation of the gas-solid ratio (0.05-0.5) of supplied gas and graded dew point control are realized, and the water content control precision is improved to + / -50ppm from + / -100ppm of a traditional process. By optimizing the nitrogen circulation path and the retention time (1.5-6 hours), a single set of system can be compatible with production modes with different water content requirements of 400-1000 ppm, the investment is saved by 40% and the energy consumption is reduced by 20% compared with a mode of additionally arranging humidifying equipment, the remarkable technical advantages are shown, and the industrial application prospect is good.

The invention discloses an oil-water separation filter element of an air compressor and a filter, and relates to the technical field of air compressor after-treatment, the oil-water separation filter element comprises an outer shell, a filtering assembly for filtering compressed air and an anti-blocking assembly for preventing a filtering medium from being blocked, the anti-blocking assembly is arranged at the top of a partition plate, and a positioning assembly is arranged on the partition plate; through the effect of the filtering assembly, compressed gas generated by the air compressor is filtered, an oil-water mixture in the compressed gas is efficiently separated, through the effect of the air pressure assembly, nitrogen is conveyed into the spiral pipe in a flowing mode and is obliquely sprayed out through the spraying opening, and backwashing treatment is conducted on the filtering assembly; nitrogen cannot chemically react with a filter element material in the backwashing process, the filter element can be effectively protected, the service life of the filter element can be effectively prolonged, nitrogen is usually dry and extremely low in water content, the filter element can be prevented from being affected with damp due to introduction of water in the backwashing process, and then blockage of a filtering medium is avoided.

The invention relates to the technical field of steelmaking dust removal fan frequency adjustment, in particular to a steelmaking dust removal fan frequency conversion adjustment method which comprises the steps that target steel grade information and information of the current smelting stage of molten steel are obtained; and obtaining the initial carbon content and the initial nitrogen content of the molten steel. And setting the target carbon content and the target nitrogen content of the molten steel according to the smelting stage information. And according to the initial carbon content and the target carbon content of the molten steel, the oxygen flow required by smelting is obtained. And obtaining the nitrogen flow required by smelting according to the initial nitrogen content and the target nitrogen content of the molten steel. And the argon flow required by smelting is obtained according to the oxygen flow. And according to the oxygen flow, the nitrogen flow and the argon flow, the flue gas flow in the smelting period is obtained. And controlling the frequency of the dust removal fan based on the flue gas flow. The power consumption of the dust removal fan can be reduced, the production cost is reduced, the influence on the environment and the health of workers is reduced, and the problem that the overall efficiency is low due to local optimum of the dust removal fan can be solved.

The invention discloses a method for determining antibiotics in environmental soil, which comprises the following steps: S1, collecting fresh soil, crushing, sieving with a 0.1 mm-0. 2mm sieve, weighing 3 g-5 g of sample, and placing in a centrifuge tube; s2, adding 50-80 mL of a methanol-acetic acid-aqueous solution into the centrifuge tube, oscillating for 3-5 min, then carrying out normal-temperature ultrasonic treatment for 25-30 min, carrying out high-speed centrifugation for 10-15 min at a low temperature of 4-6 DEG C, taking a supernatant, repeatedly extracting residues twice, merging the obtained extract and the supernatant, and concentrating to 10-15 mL to obtain a concentrated solution A; s3, adding 20-25 mL of dichloromethane into the concentrated solution, repeating the extraction operation in the S2 to obtain a concentrated solution B, and adding ultrapure water into the concentrated solution B to dilute the concentrated solution B to 200 mL; and S4, adding 1-1.5 g of disodium ethylene diamine tetraacetate into the diluent obtained in S3, adjusting the pH value to 3.5, enabling the diluent to pass through a small solid-phase extraction column, eluting the small solid-phase extraction column with methanol, blow-drying under nitrogen flow, fixing the volume, passing through a filter membrane, and transferring into a sample bottle for UPLC-MS / MS determination. According to the method, the antibiotic extraction rate and the content determination accuracy are improved.

The utility model belongs to a gas distribution system for liquid nitrogen. Comprising a liquid nitrogen storage tank connected with a liquid nitrogen pipeline, the liquid nitrogen storage tank is connected with a vaporizer through a booster pump, and an outlet of the vaporizer is connected with an IG541 fire extinguishing agent filling system and a standard gas distribution system through a first tee joint; the standard gas distribution system comprises a nitrogen circulation part, and the tail end of the nitrogen circulation part is respectively connected with the high-end gas distribution part and the standard gas distribution system through a second tee joint; the high-end gas distribution part comprises a nitrogen purification system, and the tail end of the nitrogen purification system is connected with a high-end standard gas distribution system; the method has the characteristics of reducing investment, being convenient to control, saving energy consumption and ensuring stable operation of the system.

The invention provides a method for detecting related substances of bromo-n-butane, which adopts a gas chromatography detection method, and the chromatographic conditions are as follows: a chromatographic column is a DB-624 quartz capillary column, and the specification is 30m * 0.32 mm * 1.8 [mu] m; the column temperature is 40 DEG C; the stationary phase is 6% of cyanopropyl phenyl-94% of dimethyl polysiloxane; the temperature of a sample injector is 250 DEG C; the sample size is 1 [mu] L; the split ratio is 20: 1; the carrier gas is nitrogen; the flow rate of nitrogen is 2.1 mL / min; a detector is a hydrogen ion spark detector, and the temperature of the detector is 250 DEG C. The invention further provides application of the method. The method can be used for rapidly and accurately detecting the related substances of the n-butyl bromide, realizes effective separation of the n-butyl bromide and impurities thereof, and is of great significance in improving the effective quality of the n-butyl bromide, controlling the content of the impurities brought into the synthesis reaction of the bupivacaine hydrochloride by the starting material and improving the quality stability of the bupivacaine hydrochloride.

The invention belongs to the technical field of laser processing, and particularly relates to a laser marking production device for iron tower steel part processing, which comprises a laser marking equipment main body, a laser head is arranged on the laser marking equipment main body, and the outer side of the laser head is movably sleeved with an annular outer pipe with the same circle center; the annular outer pipe is fixed to the outer side of the laser head through a height adjusting assembly, the position, facing the center of the annular outer pipe, of the bottom end of the annular outer pipe is fixedly connected and communicated with a plurality of inner nozzles arranged in an annular array, and the middle of the bottom end of the annular outer pipe is fixedly connected and communicated with a plurality of middle nozzles arranged in an annular array. And a plurality of outer nozzles which are arranged in an annular array are fixedly connected and communicated to the position, far away from the center of the annular outer pipe, of the bottom end of the annular outer pipe. When the air curtain form is switched, the nitrogen flow is synchronously adjusted through the manual switching structure, the smaller the marking range is, the smaller the flow is, gas waste is avoided, and it is guaranteed that the air curtain protection strength is matched with the marking range.

The invention discloses an AlTiN coating, a cutter and a preparation method. The AlTiN coating is deposited on the surface of the cutter. The AlTiN coating has a molecular formula of Al < m > Ti < 1-m > N < n >, m ranges from 0.5 to 0.7, n ranges from 0.8 to 1.1, and the ratio is an atomic ratio. The preparation method adopts a high-power pulse sputtering technology to deposit the AlTiN coating, and comprises the following process steps: vacuumizing a coating chamber to 5 * 10 <-3 > Pa, and heating to 450-600 DEG C; inert gas is introduced, the air pressure of the coating chamber is adjusted to be 0.5-1 Pa, an ion source is started, the bias voltage is adjusted to be-400--800 V, the frequency is adjusted to be 40-80 kHz, the temperature of the coating chamber is reduced to 300-400 DEG C, and plasma cleaning is conducted on the substrate; a nitrogen flow valve is opened, the flow of the inert gas and the flow of the nitrogen are adjusted respectively, the introduction flow of the inert gas ranges from 100 sccm to 200 sccm, the partial pressure of the inert gas ranges from 0.1 Pa to 0.3 Pa, and the air pressure of the coating chamber is adjusted and controlled to range from 0.6 Pa to 1.0 Pa by introducing the nitrogen; and setting the average power density of the AlTi alloy target material to be 15-20W / cm < 2 >, the peak current to be 400-800A and the substrate bias voltage to be-40--100V, and depositing the coating.

The invention discloses a method for solving scaling of a steelmaking dry dust removal system, which comprises the following steps of: forming 0.8-1.2 MPa dynamic medium-pressure nitrogen flow by utilizing surplus high-purity nitrogen of an oxygen making unit through a graded pulse depressurization technology, and enhancing scaling stripping; a self-adaptive pressure compensation special pipe conveying system is adopted, it is ensured that the terminal pressure ranges from 0.6 MPa to 1.0 MPa, and distribution is optimized; a steam spray gun is replaced by a self-spinning nitrogen vortex spray gun, composite spray is formed by the self-spinning nitrogen vortex spray gun and 5%-10% of deionized water through the vortex effect, and the pressure of a nozzle is 0.6-0.8 MPa; the nitrogen pulse frequency and the spray gun rotating speed are fed back and regulated through the ultrasonic sensor, the scaling speed is smaller than or equal to 80 mm / 6 months, and steam consumption is reduced to zero. According to the invention, the scaling speed is reduced by more than 30%, the service life of the spray gun is prolonged to be more than or equal to 1.5 years, the proportion of coarse ash is increased to 25-30%, the steam cost is saved per year by 13500,000 yuan, the nitrogen sales income is increased by about 2365,000 yuan, and the total benefit is remarkable. The method is energy-saving, environment-friendly and high in resource utilization rate, and an efficient solution is provided for the steelmaking industry.

The invention discloses a long drill hole nitrogen injection flow increasing and extraction promoting device, system and method for a coal seam gas area, and belongs to the field of coal mine gas extraction. The multiple nitrogen injection pipes of the device are sequentially arranged in a sleeving mode from small to large according to the diameters. The two nitrogen injection sub-pipes of the nitrogen injection pipe on the innermost layer are fixed by arranging a ventilation sleeve, a mining flexible inflation plugging air bag is arranged at the ventilation sleeve in a surrounding mode, and the mining flexible inflation plugging air bag expands till the outer wall is attached to the hole wall of the nitrogen injection long drill hole, so that N sections of independent sub-drill holes are formed in the nitrogen injection long drill hole. The nitrogen injection long drill hole is segmented into a plurality of sub drill holes to form a plurality of sections of independent nitrogen injection spaces, so that the nitrogen injection time of the nitrogen injection long drill hole can be effectively reduced; the problem that nitrogen injection pressure is remarkably attenuated in the length direction of the long nitrogen injection drill hole due to the fact that nitrogen is influenced by self compressibility, hole wall friction of the drill hole, hole surface pore structure dynamic change of the drill hole and the hole sealing effect is solved, the desorption and migration efficiency of gas is effectively improved, and the nitrogen injection displacement effect and the coal seam gas extraction efficiency are improved.

The utility model relates to the technical field of rehabilitation medical treatment, and discloses a high-low oxygen training system which comprises an air compressor, a heat exchanger, a filtering device, an air separation device, an air storage bag and an exhalation valve assembly used for being connected with a breathing mask, and the air compressor, the heat exchanger, the filtering device, the air separation device, the air storage bag and the exhalation valve assembly are sequentially connected. The exhalation valve assembly is provided with an oxygen concentration sensor used for detecting the real-time oxygen concentration in the exhalation valve assembly, the oxygen concentration sensor is in signal connection with the flow control valve so as to send the measured real-time oxygen concentration to the flow control valve, and the flow control valve is used for adjusting the flow of oxygen and nitrogen entering the air storage bag. The flow control valve and the oxygen concentration sensor achieve closed-loop control, the flow of oxygen and the flow of nitrogen entering the gas storage bag can be adjusted according to the real-time oxygen concentration in the exhalation valve assembly, and therefore the oxygen concentration of gas in the gas storage bag is adjusted, namely the oxygen concentration of gas output by the exhalation valve assembly is adjusted. Accurate adjustment of low oxygen concentration and high oxygen concentration is achieved, and adaptability is higher.

A crystal pulling method for reducing microdefects in a large-size crystal bar relates to the field of crystal bar pulling and comprises the steps of feeding, melting, necking growth, shouldering growth, equal-diameter growth and tail growth. Wherein after charging is completed, high-purity nitrogen with the purity being 99% or above is firstly charged, the pressure of the nitrogen is 0.08-0.6 MPa, and then the high-purity nitrogen is heated to 1500 DEG C or above to melt the monocrystalline silicon raw material; in the equal-diameter growth process, the furnace pressure of the single crystal furnace is adjusted to be 16 kPa to 38 kPa, and the nitrogen flow is adjusted to be 59 slpm to 101 slpm. By optimizing process parameters, particularly replacing argon with high-purity nitrogen, and accurately controlling conditions such as furnace pressure, nitrogen flow, magnetic field intensity and the like, microdefects in the crystal are remarkably reduced, and the mechanical strength and the yield of the crystal are improved.

The present application relates to the technical field of flue gas purification, and discloses a nitrogen flow determination method and device, computer equipment and a storage medium, the method comprising: obtaining flue gas data in the flue gas purification process, calculating the sulfur removal mass according to the flue gas data; obtaining active coke data in the active coke resolution process, and obtaining the required safe nitrogen flow in the active coke resolution process under a preset standard according to the sulfur removal mass and the active coke data; determining whether the system full load negative pressure meets the safe nitrogen flow, and if so, determining the resolution nitrogen flow range according to the active coke data and the current sulfur removal mass; and determining the target nitrogen flow according to the safe nitrogen flow and the resolution nitrogen flow range. The present application increases the consideration of nitrogen flow during the active coke resolution process, improves the resolution effect in the active coke resolution process, and reduces the sulfur content in the resolved active coke.

The utility model discloses a nitrogen purging assembly which comprises a three-way control valve set connected to the liquid outlet end of a crane pipe and a corrugated hose installed on a tank car quick connector, a main liquid conveying pipe is installed at the end, away from the crane pipe, of the three-way control valve set, and a Y-shaped three-way pipe is installed at the end, away from the three-way control valve set, of the main liquid conveying pipe. Opposite ports of the Y-shaped three-way pipe and the corrugated hose are connected through flanges, and a one-way air inlet valve is installed at the top end of the Y-shaped three-way pipe. The three-way control valve group is utilized to accurately control the flow and direction of nitrogen, so that the nitrogen can be shunted according to a preset path, the nitrogen can be cleaned to each dead corner and turning of a pipeline, the residual liquid cleaning efficiency is improved, and the Y-shaped three-way pipe is designed to ensure that a part of residual liquid directly enters a tank car, so that the residual liquid cleaning efficiency is improved. Therefore, the pollution risk to other areas is reduced.

The utility model relates to the technical field of pipeline blockage prevention, and provides a pipeline blockage prevention device which comprises a reactor, a nozzle is arranged on the side face of the reactor, a hydrogen pipeline fixedly penetrates through the side face of the reactor, a pneumatic valve is arranged on the circumferential face of the hydrogen pipeline, and a supporting plate is arranged on the side face of the reactor. According to the utility model, components such as an electric telescopic rod, an air pressure bin and a nitrogen bin of the nitrogen cleaning mechanism are matched with one another, so that when a worker finds that a nozzle on the side surface of the reactor is blocked, nitrogen is added into the nitrogen bin through an inflation hole of the nitrogen bin, and then the electric telescopic rod is started to enable the nitrogen to be subjected to thrust of an extrusion plate to increase pressure; the nitrogen flows into the hydrogen pipeline through the nitrogen pipeline, the flow speed of the gas in the hydrogen pipeline is increased, the nozzle is cleaned, the effect of cleaning the nozzle by increasing the flow speed through the nitrogen is achieved through the design, and then nozzle scaling is reduced.

The invention provides a gas diffusion electrode device for electrochemical lithium-mediated ammonia synthesis and an electrochemical ammonia synthesis method, and belongs to the technical field of electrochemical ammonia synthesis. The gas diffusion electrode device comprises a nitrogen runner, a sealing gasket, a working electrode, a catholyte chamber, a diaphragm, an anolyte chamber, an anode catalyst, a hydrogen runner and an electrolyte, the electrolyte comprises a lithium salt, an organic solvent, a proton shuttling agent and an interface additive. According to the invention, high nitrogen transmission is realized by adopting a circulating type gas diffusion electrode device, and a three-phase interface chemical environment of gas, electrolyte and the gas diffusion electrode is regulated and controlled by an interface additive, so that the ammonia production rate and the Faraday efficiency are remarkably improved, and continuous and efficient nitrogen reduction reaction is realized at normal temperature and normal pressure.

The application discloses a kind of laser cutting device based on metal nanometer plate production and processing, it is related to metal nanometer plate laser cutting technical field.In the present application, nitrogen inlet side of guide platform component is equipped with nitrogen input pipe, and nitrogen outlet side of guide platform component is equipped with nitrogen output pipe;Two sides of lower passage plate are attached with airtight part;Pushing module is used to push metal nanometer plate to lower passage plate and airtight part top;Cutting power component includes U-shaped passage plate for covering outside airtight part;Laser cutting assembly is slidably installed on corresponding lateral airtight assembly and includes laser cutter in airtight part.The present application can realize closed laser cutting in nitrogen flow environment through the synergistic effect of lower flue, upper flue, flow guide smoke cavity one and flow guide smoke cavity two, effectively realize that smoke and debris generated in cutting process are blown away, to avoid the influence of smoke and debris on metal nanometer plate cutting quality.

The invention discloses a liquid hydrogen heat exchange experimental device, which relates to the field of aero-engines and comprises a liquid hydrogen loop, a nitrogen heating loop, a test section, a measurement and control module and a safety protection module, wherein the liquid hydrogen loop is used for providing supercritical hydrogen meeting a preset working condition; the nitrogen heating loop is used for heating nitrogen to a target working condition temperature and providing a convection heating environment for the test section; the test section comprises a straight pipe type sealing sleeve, supercritical hydrogen circulates in an inner pipe of the straight pipe type sealing sleeve, and high-temperature nitrogen circulates in an outer pipe of the straight pipe type sealing sleeve; the measurement and control module comprises a controller, and the controller and the heater are configured to dynamically adjust the flow of hydrogen and nitrogen and the heating power of nitrogen so as to simulate transient working conditions; the safety protection module is used for conducting steady state judgment and safety monitoring according to data collected by the liquid hydrogen side sensor and the nitrogen side sensor. According to the invention, the convective heat transfer performance of supercritical hydrogen can be accurately measured under low-temperature, high-pressure and safe conditions, and reliable experimental support is provided for thermal management of a hydrogen fuel aero-engine.

The invention discloses an emptying natural gas recovery system and method. The natural gas recovery subsystem comprises a natural gas inlet, a natural gas pre-cooling device, a pretreatment device, a moderate cooling device, a light hydrocarbon separation device, a natural gas cryogenic liquefaction device, a non-condensable gas separation device and a liquefied natural gas outlet which are communicated in sequence; the liquid nitrogen gasification subsystem comprises a liquid nitrogen inlet, a nitrogen outlet and pipelines which are sequentially connected among the liquid nitrogen inlet, the natural gas cryogenic liquefaction device, the natural gas moderate cooling device, the natural gas precooling device and the nitrogen outlet; and the nitrogen replacement subsystem is used for injecting nitrogen collected from the nitrogen outlet into an emptying pipeline after decompressing and heating the nitrogen. The system gasifies liquid nitrogen by using heat energy released by natural gas liquefaction, and liquefies natural gas by using cold energy released by liquid nitrogen gasification; nitrogen flowing out after being used for cooling natural gas is injected into the emptying pipeline to replace low-pressure natural gas, the pressure in the natural gas pipeline is kept stable, low energy consumption is achieved, and the low-pressure natural gas is effectively recycled.

The invention belongs to the technical field of nuclear power, and discloses a degassing system and a degassing method for a nuclear reactor coolant. The degassing system of the nuclear reactor coolant comprises a hollow fiber membrane degassing device, a coolant storage device connected with a coolant input end of the hollow fiber membrane degassing device, and a vacuum device connected with a nitrogen output end of the hollow fiber membrane degassing device, the hollow fiber membrane degassing device comprises at least one vertically arranged degasser; the degasser comprises a coolant channel and a membrane wire channel which are arranged in the vertical direction; coolant flows in the coolant channel from bottom to top, and nitrogen flows in the membrane filament channel from top to bottom. The hydrophobic characteristic of the hollow fiber membrane is utilized, and the membrane degassing technology is combined with vacuum suction and nitrogen purging to achieve the deep degassing target. According to the degassing system for the nuclear reactor coolant, the coolant flows from bottom to top in cooperation with nitrogen flowing from top to bottom, so that the whole system operates reliably for a long time, and energy consumption is optimized.

The present invention relates to a method for effectively solving the problem of coal rock cracks, and a technical solution thereof is to use inorganic grouting reinforcement materials for mining as a plugging liquid for repair. In the absence of human interference, when cracks occur in the coal rock, nitrogen flows out through the cracks, causing the air pressure valve to change. The changed data is transmitted to the control device and displayed on the display screen at the same time. Relevant personnel can analyze the process of data change. After analysis, the controller triggers the gas-liquid separation switch to work, opens the plugging liquid and closes the nitrogen. The plugging liquid is sprayed onto the coal rock cracks through the gas-liquid coexistence grouting pipeline. After the cracks are filled, the controller triggers the gas-liquid separation switch again. This high-efficiency circulating crack filling method can repair the harmful cracks generated in the coal rock to the greatest extent and for the longest time, and is an innovation in the self-repair method of coal rock cracks.

The present invention relates to the field of research on the flow and heat transfer characteristics of supercritical nitrogen in pipelines, and more particularly to a multifunctional experimental system for studying the flow and heat transfer of supercritical low-temperature nitrogen. The outdoor portion of the supercritical low-temperature nitrogen experimental system includes a liquid nitrogen storage tank for storing liquid nitrogen, a cryogenic pump for pressurizing, a high-pressure vaporizer for vaporizing the liquid nitrogen, a liquid nitrogen thermostat for cooling the nitrogen, a buffer tank for stabilizing pressure and flow, and gas-liquid separation, and a cryogenic and high-pressure pressure reducing valve for regulating outlet pressure, all interconnected by pipelines. The system also includes an automatic control box for controlling electrical components. The indoor portion includes a main regulating valve, a flow meter, a third pressure transmitter, and a third temperature transmitter, all interconnected by pipelines. The experimental system itself can directly provide medium- and low-pressure liquid nitrogen as a cold source for cooling the vaporized nitrogen pipeline, providing a large amount of experimental data support for the development of efficient and compact pre-cooling heat exchangers, and is suitable for widespread promotion.

The invention discloses a method for directly regenerating germanium and bismuth from a BGO waste target material, which belongs to the technical field of resource regeneration, and has the beneficial effects that through a self-made reduction-vacuum integrated furnace, through the processes of ball milling, charging, nitrogen feeding and oxygen discharging, reduction and ingot casting, nitrogen feeding and hydrogen discharging, furnace shutdown and discharging and the like, the germanium and bismuth can be directly regenerated; according to the method, germanium and bismuth metals can be directly regenerated from the BGO waste target material; and the method has the advantages of high direct recovery rate of germanium and bismuth, simple process operation, low production cost, no secondary pollution and the like.

The utility model relates to a nitrogen gas heating device, including: intermediate pipe body, internal pipe body, heating pipe and gas inlet interface, intermediate pipe body is sleeved outside internal pipe body and is fixed relative to internal pipe body position, intermediate pipe body and internal pipe body form a second cavity, gas inlet interface and second cavity are communicated, heating pipe is located in second cavity, and gas inlet interface is located in the second cavity. The second cavity communicates with the interior of the inner pipe body through the third channel. The heating pipe is used for heating the nitrogen, the heated nitrogen heats the process waste gas and the inner wall of the pipeline through which the process waste gas flows, the number of the process waste gas deposited on the inner wall of the pipeline is small at the high temperature, and therefore blockage of the inner wall of the pipeline is relieved, and the maintenance period of the pipeline is prolonged. The waste heat of the outer wall of the middle pipe body is used for heating a small part of nitrogen in the first cavity, and the residual heat is utilized, so that the consumption of the heating pipe is reduced; nitrogen flowing in the first cavity takes away most waste heat, the temperature of the external pipe body is reduced, and workers are prevented from being scalded.