582 results about "Liquid oxygen" patented technology

The gradually-expanded printed circuit board type heat exchange inner core comprises a cover plate, a bottom plate, a cold side plate layer and a hot side plate layer, a cold side gradually-expanded channel is of a flow channel structure with the width gradually expanded, and the sectional area of a flow channel dynamically adapts to gas-liquid phase change and volume change. And pressure drop fluctuation and bubble aggregation caused by gas phase expansion are reduced, the shunt channels and the divergent channels are arranged in parallel, an inner wall porous structure is combined, medium distribution uniformity is optimized through graded distribution and surface wettability enhancement, and the flow stability is remarkably improved. The turbulent flow ribs are arranged in the heat exchange channel on the heat side, combination of heterogeneous working media such as supercritical CO2-water and liquid hydrogen-liquid oxygen is supported by destroying a heat boundary layer, inducing turbulent flow and strengthening convective heat exchange and phase change heat transfer, the heat exchanger can improve the heat exchange efficiency while reducing pressure drop, compactness, reliability and wide working condition adaptability are considered, and the heat exchange efficiency is improved. Two-phase flow optimization and efficient heat exchange are achieved, and the extreme heat exchange requirements in the fields of aerospace, new energy and the like are met.

The invention discloses an anti-static flexible fracturing rock breaking pipe based on a conductive oxygenating conduit, which comprises a flexible outer sleeve film with two closed ends and filled with an adsorbing material combustion agent, and further comprises the conductive oxygenating conduit penetrating into the flexible outer sleeve film from the top of the flexible outer sleeve film, an excitation wire and an exhaust pipe, the excitation wire is connected with an electric ignition device, and the electric ignition device is positioned in the flexible outer sleeve film and is in contact with the adsorption material combustion agent; the outer wall of the conductive oxygenation conduit is connected with a conductive unit. The invention further discloses a rock breaking method using the anti-static flexible fracturing rock breaking pipe based on the conductive oxygenating guide pipe, the conductive unit is arranged on the conductive oxygenating guide pipe and makes contact with the ground for conduction, static electricity generated in the filling process of liquid oxygen or pressurized high-purity liquid oxygen can be guided out and eliminated, and the anti-static flexible fracturing rock breaking pipe based on the conductive oxygenating guide pipe can be used for breaking rocks. Static electricity generated in the filling process of liquid oxygen or high-purity liquid oxygen with pressure can be conducted away and eliminated more efficiently, timely and continuously, and the risk of safety accidents caused by the static electricity is greatly reduced.

The invention provides a liquid oxygen methane engine test bed composed of a multifunctional test system. The test bed comprises a gas path system, a liquid path system and a test station. Wherein the gas path system and the liquid path system are connected through a pipeline for gas supply, and the liquid path system is connected with the test run station and used for providing liquid fuel needed by testing for the test run station. The liquid path system comprises a low-pressure liquid path module and a high-pressure liquid path module. And the low-pressure liquid path module and the high-pressure liquid path module are respectively connected with a test run station. The test bed is composed of a set of gas path system, two sets of liquid path systems and three test stations. The two sets of liquid path systems jointly adopt one set of gas path system for gas supply, so that medium conveying can be carried out on the three test run stations according to requirements, the test run platform can meet the gas distribution requirements of engines of different models, meanwhile, the resource sharing of test equipment is improved, the total cost of equipment construction and maintenance is greatly reduced, and the working efficiency is improved. And the engine testing efficiency is improved.

The invention discloses a hydrogen low-temperature precooling device and method with oxygen liquefaction, relates to the technical field of low-temperature refrigeration and hydrogen energy liquefaction, and is particularly suitable for cooperative utilization of a hydrogen-oxygen co-production system in green hydrogen production. The device comprises a hydrogen pre-cooling cold box, a liquid oxygen cold box, a mixed refrigerant compression and heat exchange system, a nitrogen circulating refrigeration system and a trace oxygen analyzer arranged in a nitrogen loop. The raw material hydrogen is subjected to purification, precooling, adsorption and ortho-parahydrogen conversion treatment to obtain liquefiable precooled hydrogen; a liquid oxygen product is output after raw material oxygen is purified and liquefied through heat exchange. According to the device, cryogenic heat exchange is achieved through two-stage circulation of mixed refrigerants and nitrogen, a multi-temperature-zone segmented heat exchange network is constructed through multiple separation tanks and a throttling path, and the refrigeration efficiency and the heat recovery capacity are both considered. And liquid oxygen cooling can be dynamically regulated and controlled through a temperature-regulating nitrogen path to adapt to various working conditions of the electrolytic cell. The device is compact in structure, high in safety, excellent in energy efficiency and suitable for the hydrogen-oxygen synergistic liquefaction treatment scene in a water electrolysis hydrogen production device.

The invention discloses a liquid oxygen methane rocket engine fault prediction method and system based on an ARMA model, and the method comprises the steps: constructing a modularized simulation model of a liquid oxygen methane rocket engine, injecting fault factors to simulate typical faults (such as methane pump cavitation, turbine blade ablation and the like), and obtaining normal and fault data containing Gaussian noise; carrying out time sequence modeling on the six key parameters by adopting an ARMA (Autoregressive Moving Average Model), and optimizing model parameters through ACF / PACF order determination and AIC criteria; establishing a self-adaptive residual threshold formula (threshold = residual mean + / -2 times of standard deviation), and realizing early warning of the fault by combining a judgment criterion that the threshold is continuously exceeded for three times and three parameters cooperatively give an alarm; experiments show that the alarm time is 0.1-0.13 seconds earlier than that of a traditional red line threshold method, the false alarm rate is reduced from 18.7% to 0.3%, and the spaceflight-level real-time performance and reliability requirements are met; the method does not need a large number of fault samples, is high in anti-interference capability, and is suitable for online health monitoring of reusable rocket engines.

The invention discloses a liquid air energy storage system based on air separation, which is characterized by comprising an air purification unit, an energy storage unit, an air rectification unit and an LNG (Liquefied Natural Gas) cold supply unit, wherein the air purification unit comprises an air filter, an air compressor, a first cooler, an adsorber and a first heater, and the energy storage unit comprises a first liquid separation tank, a liquid air storage tank, a liquid air pump and an air expansion machine. The air rectification unit comprises a rectification tower, a main cold box, a second liquid separation tank, a second subcooler, a first heat exchanger, a liquid nitrogen storage tank, a liquid oxygen storage tank, a second heat exchanger, an argon rectification system and a liquid argon storage tank; and the LNG cold supply unit comprises a first nitrogen supercharger, a second nitrogen supercharger, an LNG cold box and a first subcooler. The system has the functions of air separation and electric energy storage at the same time, and cold energy of the LNG receiving station is fully utilized for air separation and energy storage to participate in construction of a novel power system of a power grid.

The invention belongs to the technical field of carbon fiber composite materials, and particularly relates to a carbon fiber reinforced composite material for an aerospace low-temperature storage tank and a preparation method of the carbon fiber reinforced composite material. The preparation method of the carbon fiber reinforced composite material for the aerospace low-temperature storage tank comprises the following steps: (1) preparing a polyamide acid prepolymer solution; (2) adding the polyamide acid prepolymer solution, a phosphorus-containing flame-retardant monomer and nano nitrile rubber into a solvent for reaction to prepare a sizing agent; (3) carbon fibers are soaked in the sizing agent, taken out and dried, and sized carbon fibers are obtained; and (4) mixing nano nitrile rubber with a resin matrix, and then carrying out prepolymerization and thermal imidization curing molding on the mixture and the sized carbon fibers to obtain the carbon fiber composite material. The carbon fiber reinforced composite material obtained by the invention not only has excellent liquid oxygen compatibility, but also can maintain excellent leakage resistance and mechanical properties in an extremely high and low temperature cycle environment, and provides technical support for application of aerospace low-temperature storage tanks.

The utility model provides a bamboo joint type oxygen inhalation inner core assembly and a fracturing pipe, relates to the technical field of expansion fracturing, and comprises an inner core, the inner core comprises an infusion tube, liquid outlets are arranged in the circumferential direction of the infusion tube, a first quick connector with a central through hole is arranged at the lower end of the infusion tube, a medium layer is arranged outside the infusion tube, and a second quick connector with a central through hole is arranged outside the medium layer. The dielectric layer is used for absorbing liquid oxygen in the infusion tube; the at least one electronic excitation unit comprises an ignition head and an excitation cartridge bag, the excitation cartridge bag is arranged outside the dielectric layer, and the ignition head is used for igniting the excitation cartridge bag; the inner cores are connected end to end through first quick connectors. The oxygen inhalation inner core assembly is formed by sequentially connecting the multiple inner cores end to end, so that the oxygen inhalation inner core assembly can be flexibly adjusted and assembled in the length direction and the radial direction according to the length and the diameter of the fracturing pipe.

The invention provides a gas phase change rock breaking device and method based on an aluminothermic reaction, and belongs to the technical field of rock blasting. The rock breaking device comprises a graphite excitation pipe, a liquefied air bag and a sealing cover, the excitation pipe is filled with thermite, and thermite reaction can be carried out to release heat; the liquefied air bag is hermetically sleeved outside the excitation tube, is filled with liquid oxygen or liquid nitrogen and is changed into gas under the action of heat released by the excitation tube, and rock mass fracture is realized by volume expansion. By arranging a multi-section excitation pipe serial connection structure, adopting the industrial graphite excitation pipe, designing a liquid oxygen or liquid nitrogen double-medium system and using the polyethylene degradable material bag body, the safety, the economical efficiency and the environmental adaptability of open-air rock mining are remarkably improved.

The invention provides a device and method for exciting liquid oxygen phase change blasting through combustion of a non-static flammable adsorbing material, the device comprises a flexible pipe cavity filled with liquid oxygen, a liquid filling pipe, a flammable medium and a grounding wire are arranged in the flexible pipe cavity, and the flexible pipe cavity is composed of a base material layer, a heat insulation layer and an anti-static layer. Static electricity is eliminated by arranging the grounding wire and the anti-static layer; the heat insulation layer is arranged to reduce heat loss; by using the combustible medium prepared from agricultural and forestry wastes, the cost is reduced, and resource reutilization is realized; and through the special design of the liquid filling pipe, the combustible medium quickly and uniformly absorbs liquid oxygen, and the rock breaking efficiency is improved. The problems of electrostatic potential safety hazards, poor heat insulation performance and high combustible medium cost in an existing liquid oxygen blasting technology are solved, and the method has the comprehensive advantages of being safe, efficient, economical and environmentally friendly.

The invention relates to the technical field of fry transfer, in particular to a land-sea relay high-efficiency low-stress transfer method for mackerel fry. The method comprises the steps of transferring from a nursery pond to a fry collecting pond, intelligently counting fries and transferring in water, conveying the fries to a fry conveying box, conveying the fries to a transport vehicle on a land track, transferring the fries to the transport vehicle through a crane and transferring the fries to a wharf and sea, and finally putting the fries into a net cage through a transport ship. In the transfer process, a buffer discharge pipeline and an underwater conveying system are utilized, and independent circulating water and liquid oxygen supply systems of an intelligent counting machine and a fry conveying box are combined, so that the fries are always in a stable water environment, mechanical damage can be avoided, stress caused by sudden change of the environment is reduced, meanwhile, all links are efficiently and cooperatively operated, and the transfer efficiency of the fries is improved. The problem of high death rate caused by mechanical injury, environmental mutation and stress reaction in the transfer process of the fries is fundamentally solved, so that the survival rate of the fries is increased, and the breeding production is smoothly carried out.

The utility model provides an upper end cover of a liquid oxygen fracturing pipe suitable for underwater rock mass, and relates to the technical field of expansion fracturing, the upper end cover comprises an end cover body, the upper surface of the end cover body is provided with counter-force petals, the counter-force petals are annularly arranged on the upper surface of the end cover body, and the counter-force petals are arranged on the lower surface of the end cover body. The counter-force petals are arranged on the upper end cover, an acute included angle alpha is formed between the counter-force petals and the axial direction of the end cover body, the counter-force petals are made of semi-rigid materials, the end cover body is used for being detachably connected with a fracturing pipe, and the counter-force petals are arranged on the upper end cover, so that the counter-force petals can be clamped to the inner wall of a blast hole, the buoyancy effect of water on the fracturing pipe is counteracted, and the fracturing effect is improved. And therefore, an operator can mount the fracturing pipe at the bottom of the blast hole.

The present disclosure relates to a liquid oxygen vent silencer used in an oxygen production process implemented so as to eliminate potentially explosive elements, and the vent silencer is manufactured using copper plates and stainless (SUS) having no risk of explosions to minimize an edge that collide with oxygen gas, and includes a silencer body that receives cryogenic liquid gas and moves an internal space up and down to reduce noise; and a body support that is installed along an outside of the silencer body and supports the silencer body by raising or lowering the silencer body from a ground.

The invention discloses a liquid oxygen rock breaking system and method, the system comprises an oxygenation system, a gas distribution system, a fracturing rock breaking pipe system, an excitation system and an electrostatic prevention and removal grounding system, a fracturing rock breaking pipe comprises a flexible outer sleeve film, an oxygenation guide pipe in the flexible outer sleeve film extends to the bottom and is filled with an adsorption combustion agent, and the top end of the flexible outer sleeve film is sealed through a hole sealing filling body. The method comprises the steps of manufacturing and installing the fracturing rock breaking pipe, sealing holes through the hole sealing filling body, laying the gas distribution pipeline and the wire, precisely injecting oxygen and synchronously exciting. Through modular integration and structural innovation, the problems that in a traditional liquid oxygen rock breaking technology, oxygenation is not uniform, pressure is unbalanced, excitation is not synchronous and the like are solved. The multi-stage gas distribution system is combined with the flow distributor to achieve dynamic distribution of liquid oxygen according to the drilling depth, the flexible outer sleeve film is matched with the hole sealing filling body to form a pressure self-balancing structure, a wire network is excited in parallel to guarantee millisecond-level synchronous ignition of multiple pipes, and static electricity prevention and removal grounding guarantees construction safety.

A device and a method for producing hydrogen and byproduct oxygen by using green electricity electrolyzed water are provided. The device comprises an oxygen purifying system, a heat exchange system, an air separation compression and expansion system, an air separation rectification system and a liquid oxygen storage system. The method comprises the following steps: first, purifying oxygen prepared by electrolyzing water by green electricity to remove impurities such as hydrogen, carbon monoxide, carbon dioxide and water in the oxygen, then feeding the pure oxygen into the heat exchange system, performing heat exchange liquefaction to obtain liquid oxygen, coupling the liquid oxygen generated by rectification of the air separation rectification system, and obtaining pressurized oxygen through the heat exchange system and the air separation compression and expansion system.

The utility model discloses a system for increasing dissolved oxygen in a water body. The system comprises an air separation oxygen generator, a liquid oxygen storage tank, a gas distributor and an aeration device. The air separation oxygen generator is used for preparing liquid oxygen, the liquid oxygen storage tank is used for storing the liquid oxygen, and the aeration device is used for dissolving pure oxygen in a water body through aeration to increase the dissolved oxygen in the water body so as to restore the dissolved oxygen in the anoxic water body to the normal concentration, and is used for increasing the dissolved oxygen in the anoxic river, lake and reservoir water bodies so as to restore the normal dissolved oxygen concentration.

The invention relates to an adjusting method capable of adjusting flow parameters in a poor krypton tower, and belongs to the technical field of system parameter adjustment or regulation and control. 2, deviation calculation and coupling modeling are carried out, wherein through a poor krypton tower flow-working condition coupling model, the tower inlet air flow adjusting amount, the poor krypton outlet pressure adjusting amount and the liquid oxygen backflow flow adjusting amount are output; 3, multi-actuator cooperative adjustment is carried out; 4, self-adaptive optimization: recording the convergence trend of the adjusted deviation value in real time; step 5, fault redundancy regulation and control: when any sensor fails, automatically switching to a redundancy mode, and evaluating the failed sensor according to the parameter association relationship between the measured data of the other two sensors and the flow-working condition coupling model of the poor krypton tower; the method has the beneficial effect that stable adjustment of flow parameters in the poor krypton tower is realized.

The invention discloses a diving bell air supply system for diving and an air supply method thereof.The air supply system comprises a diving bell body, a diving bell umbilical cord, a diver umbilical cord and a bell-borne air supply unit, the diving bell umbilical cord comprises an air supply pipeline and a breathing air pipeline, and high-pressure environment air is provided for the diving bell body, and breathing air is provided for operators; the clock-borne gas supply unit comprises a helium bottle, a liquid nitrogen Dewar bottle and a liquid oxygen Dewar bottle, high-pressure helium-oxygen mixed gas is stored in the helium bottle, gas outlet pipelines of the liquid nitrogen Dewar bottle and the liquid oxygen Dewar bottle are connected to the breathing gas supplementing pipe in parallel, and supplemented nitrogen and / or oxygen are / is adjusted based on the working depth of the diving clock body. The breathing air supply pipe and the breathing air supplementing pipe are connected to the inlet end of the busbar after being connected in parallel and converged, the inlet end of the busbar is further connected with a breathing air pipeline, and the outlet end of the busbar is connected with multiple diver umbilical cords. The proportion of helium, nitrogen and oxygen can be flexibly adjusted according to the current operation depth of the diving bell, and the breathing requirements of divers at different water depths are effectively met.

The invention provides a manufacturing and assembling process of a tunneling liquid oxygen rock breaking fracturing device, the fracturing device, an exhaust pipe, a liquid injection pipe, an electric ignition head, an ignition wire and a manufacturing tool are included, the assembled fracturing device is safe, reliable and extremely high in operability, drilling is completed on a tunneling section according to design, and the fracturing efficiency is greatly improved. The assembled fracturing device is pushed to a certain position of a blast hole and blocked, and oxygen injection detonation can be completed according to a program; the liquid oxygen rock breaking fracturing device is good in rock breaking effect when being used for tunneling, simple, easy to use, reliable, efficient, economical, applicable and capable of being used in various scenes. Compared with traditional explosive blasting, liquid oxygen rock breaking is small in harmful effect influence range, few in toxic and harmful products, higher in efficiency and lower in cost, and is a novel green, environment-friendly, efficient and safe tunneling construction technology.

The invention discloses a high-power multi-channel independent delay detonation control system which comprises a main controller, the main controller is connected with an integrated cabinet, a battery pack module, an inverter module and a rectifier module are arranged in the integrated cabinet, and a controller module, the battery pack module, the inverter module, the rectifier module and the controller module are connected in sequence; a heat dissipation system is arranged in the integrated cabinet, and the controller module is connected with an ignition device in the blast hole. The invention further discloses a high-power multi-channel independent delay detonating control method, the problems that existing detonating equipment is short in discharging time, small in discharging current, low in discharging power and few in output channel are solved, and the high-power multi-channel independent delay detonating control method can be widely applied to bursting balloons and detonating fireworks and crackers. And the device can also be used as detonating equipment for an explosive blasting technology, a carbon dioxide blasting technology and a liquid oxygen rock breaking technology.

The liquid oxygen storage converter comprises a storage tank, a valve body, a filling pipe, an exhaust pipe, a gasification pipe and an oxygen supply end pipe, a filling hole and an exhaust hole are formed in the valve body, the filling hole and the exhaust hole both penetrate through the valve body, valve element assemblies are arranged in the filling hole and the exhaust hole, a filling opening is formed in the top of the filling hole, and an exhaust opening is formed in the top of the exhaust hole; the storage tank is of a double-layer structure, the valve body is arranged at the top of the storage tank, the top end of the filling pipe is connected with the bottom end of the filling hole, and the bottom end of the filling pipe extends into the storage tank. The liquid oxygen storage device has the advantages that the storage cavity in the storage tank does not make direct contact with the valve body, in the non-use state, the heat exchange area between the storage cavity in the storage tank and the outside is greatly reduced, heat absorption gasification of liquid oxygen in the storage cavity in the non-use state can be effectively reduced, liquid oxygen waste is reduced, and therefore the storage period of the liquid oxygen is greatly prolonged; the whole device can be normally used when being vertically placed and transversely placed, and the liquid oxygen gasification amount is stable in the using process.

The present invention relates to a cold-electricity integrated utilization system based on energy coupling, comprising: an LNG receiving station, wherein LNG is gasified into natural gas after being utilized for cold energy by a cold energy power generation and refrigeration system, a liquid air energy storage system, a cold energy air separation system, and a light hydrocarbon separation system. The natural gas then enters the natural gas pipeline network, the gas-fired power generation system, and the natural gas hydrogen production system; the cold energy power generation and refrigeration system utilizes cold energy to generate electricity for self-use within the plant area, with excess electricity transmitted to the power grid, while also producing refrigerated products; the liquid air energy storage system utilizes cold energy to generate electricity for self-use within the plant area, with excess electricity transmitted to the power grid; the cold energy air separation system utilizes cold energy to produce liquid oxygen, liquid nitrogen, and liquid helium; the light hydrocarbon separation system utilizes cold energy to produce ethane and LPG products; the gas-fired power generation system utilizes natural gas to generate electricity and transmits it directly to the power grid; and the natural gas hydrogen production system utilizes natural gas to produce hydrogen. The present invention can be widely applied to the field of LNG cold energy utilization technology.

The invention provides a conversion system and a conversion process for preparing methanol from coke oven gas, and relates to the technical field of processes for preparing methanol from coke oven gas. The conversion system for preparing methanol from coke oven gas comprises an oxygen supply module at least provided with an air separation oxygen supply unit and an oxygen supply compressor which are communicated with each other; a mixing module having at least a first mixing unit and a second mixing unit; and the conversion module is communicated with the first mixing unit and the second mixing unit. Wherein the oxygen supply compressor is further communicated with a liquid oxygen supply unit, and the liquid oxygen supply unit is used for supplementing supplied oxygen; the first mixing unit is communicated with the oxygen supply compressor, and the first mixing unit is communicated with a steam generator and carbon dioxide supply equipment; the second mixing unit is communicated with the steam generator and the coke-oven gas compressor; the first mixing unit is provided with a first heating device; and the second mixing unit is provided with a second heating device. The conversion rate of methanol synthesized from coke oven gas can be improved.

The invention discloses an intermittent emission online control system of a low-temperature engine. The intermittent emission online control system comprises a control gas cylinder, an electric gas valve and a pre-cooling discharge valve which are sequentially connected through a pipeline, the precooling discharge valve is respectively communicated with the electric gas valve, the liquid oxygen main valve, the rocket liquid oxygen storage tank and a discharge pipeline through pipelines; the system further comprises a rocket-borne computer and a temperature sensor, and the temperature sensor is installed on a low-temperature pipeline connected with the engine. The temperature sensor is connected with the rocket-borne computer through a measuring cable; and the electric air valve is connected with the rocket-borne computer through a control cable. The invention further discloses a low-temperature engine intermittent emission online control method. According to the method, through real-time monitoring and dynamic optimization of the intermittent emission time sequence, the adaptability of an existing emission control method to different flight tasks is improved, the propellant emission consumption is reduced, and the success rate and economical efficiency of the rocket flight tasks are improved.

The utility model relates to the technical field of liquid oxygen preparation, and discloses an air filter for liquid oxygen preparation, which comprises a filter box, an air inlet hole is arranged in the middle of the right side of the filter box, the right side of the filter box is fixedly connected with two limiters, the adjacent sides of the two limiters are fixedly connected with vibrators, and the vibrators are fixedly connected with the air inlet hole. The left sides of the two limiters are fixedly connected with permanent magnets, the right side of the inner wall of the filter box is fixedly connected with a mounting frame, the left side of the inner wall of the mounting frame is fixedly connected with a plurality of springs, the right ends of the springs are fixedly connected with the same push plate, and the right side of the mounting frame is fixedly connected with a differential pressure sensor. After the main filter screen is damaged, the permanent magnet brings the main filter screen out of the air inlet hole, the vibrator separates the main filter screen, the square telescopic stop lever does not limit the standby filter screen, the spring pushes the standby filter screen into the sliding groove, the overall structure is simple, and air filtration is not affected.

The application discloses a TPMS structure micro-channel heat exchanger and a manufacturing method, and belongs to the field of structural design and manufacturing of rocket engine heat exchangers. The heat exchanger core is a plurality of spiral flow channel structures adopting TPMS. The inlet side of a liquid oxygen inlet and outlet collector is connected with the inlet of the core spiral flow channel through a liquid oxygen partition plate, and the outlet side of the liquid oxygen inlet and outlet collector is connected with the outlet of the core spiral flow channel. A fuel gas inlet pipeline is connected with the inlet of the core spiral flow channel through a fuel gas partition plate, and a fuel gas outlet pipeline is connected with the outlet of the core spiral flow channel. The liquid oxygen partition plate and the fuel gas partition plate are each provided with a plurality of through holes, the through holes correspond to the spiral flow channels in the core one by one, and each through hole is connected with the inlet of one spiral flow channel in the core. The application adopts the TPMS spiral flow channel structure to increase the internal heat exchange area of the heat exchanger and improve the heating efficiency of the heat exchanger on fuel in the working process of the engine.

The invention discloses a multifunctional air separation device for preparing liquid oxygen by liquefying air and nitrogen through a liquid oxygen self-pressurization evaporator and pouring liquid nitrogen backwards. Comprising an air filtering and compressing system, a pre-cooling system, an air purifying unit, a main heat exchanger, a liquid oxygen evaporator, a low-pressure expansion machine, a rectifying tower, a liquid air and liquid nitrogen subcooler, a high-purity oxygen tower, an argon extracting system, a medium-pressure nitrogen pipe network, a liquid oxygen pipe network, a nitrogen liquefier, a heat exchanger I and a gas-liquid separator, the output of the liquid oxygen evaporator is provided with a pressure oxygen pipeline, the pressure oxygen pipeline exchanges heat through the main heat exchanger and then is output and stored, the output of the bottom of the liquid oxygen evaporator is provided with a product liquid oxygen pipeline, the medium-pressure nitrogen pipe network is output to the nitrogen liquefier through the heat exchanger I, the input of the liquid oxygen pipe network is connected with the nitrogen liquefier, and the nitrogen liquefier is connected with the gas-liquid separator. The hydrogen-free argon production process and the oxygen external compression mode are adopted, the liquid oxygen self-pressurization function is achieved, air and nitrogen are liquefied, and the multifunctional characteristic is achieved.

The utility model discloses a natural gas melting furnace for melting aluminum ingots, and belongs to the technical field of metal melting equipment. The melting furnace comprises a box body and a furnace body, a liquid oxygen storage tank, a VPSA oxygen generator and a waste gas treatment box are integrated in the box body, and the liquid oxygen storage tank is connected with an oxygen supply pipeline through a vaporizer; the furnace body shell adopts a gradient refractory layer structure; the oxygen supply pipeline is of a Y-shaped parallel structure, a flame arrester and a dynamic pressure balance valve are arranged in the oxygen supply pipeline, and the oxygen flow is adjusted through linkage of a pressure sensor and a controller. A water-cooling observation window is arranged on the inner wall of the furnace body, and a thermal infrared imager is installed on the outer side to monitor the temperature of a molten pool and feed back and control combustion power. According to the utility model, efficient melting, safe oxygen supply and accurate temperature control are realized through structure optimization, and the device is suitable for continuous melting scenes of aluminum ingots.

The invention relates to a facility for cooling a flow of cryogenic fluid comprising a first circuit for fluid to be cooled, for example liquid nitrogen and / or liquid oxygen, a cryogenic refrigerator with a cycle circuit, at least one heat exchanger providing heat exchange with the first circuit for fluid to be cooled and the cycle circuit of the refrigerator, the facility comprising a second circuit for fluid to be liquefied, for example nitrogen gas and / or oxygen gas, the second fluid circuit being in heat exchange with the cycle circuit of the refrigerator in at least one heat exchanger of the facility, the facility being configured so as to be switchable into a first cooling operating mode, in which the facility cools the first fluid circuit in order to cool a liquefied fluid, preferably in order to generate a quasi-isothermal transformation of said fluid, and a second liquefaction operating mode, in which the facility cools the second fluid circuit with a view to liquefying a gas flow.

The invention discloses a liquid oxygen circulation supercooling system, and relates to the technical field of liquid oxygen storage management, liquid oxygen is stored in a liquid oxygen storage tank, the liquid oxygen enters a self-pressurization vaporizer from a vaporization liquid inlet pipe to be vaporized, oxygen generated by vaporization enters the liquid oxygen storage tank from a vaporization steam exhaust pipe, so that the pressure in the liquid oxygen storage tank is increased, and the liquid oxygen is discharged into a pipe needing to be cooled after being increased; the supercooling process is realized when the liquid oxygen in the pipe needing to be cooled flows through the cooler, and the liquid oxygen flows back to the liquid oxygen storage tank again after being supercooled; the device is applied before a launching task starts, liquid oxygen in the liquid oxygen storage tank is supercooled through continuous liquid oxygen circulating flow, compared with supercooling when liquid oxygen is injected into a rocket, supercooling is conducted in advance in the storage stage, injection peak flow does not need to be matched, the size of the device is smaller, and the manufacturing cost is lower.