20 results about "Liquid methane" patented technology

The utility model provides a full supercooled liquid methane filling system. The full supercooled liquid methane filling system comprises a refrigerant filling module, a supercooled liquid methane module and a liquid methane filling module. Wherein the refrigerant filling module is connected with a liquid methane supercooling storage tank of the supercooling liquid methane module through a filling pipeline and is used for supercooling liquid methane in the liquid methane storage tank. And the supercooled liquid methane module is connected with the liquid methane filling module through a pipeline and is used for filling cooled liquid methane into the rocket storage tank. The liquid methane supercooling storage tank comprises a liquid methane storage tank and a heat preservation layer located outside the liquid methane storage tank, and a refrigerant interlayer is arranged between the liquid methane storage tank and the heat preservation layer and used for containing the refrigerant provided by the refrigerant filling module and cooling liquid methane in the liquid methane storage tank. According to the filling system, the liquid methane supercooling efficiency can be improved, liquid methane crystallization is avoided, the supercooling process is stable and efficient, and the economic benefit of the supercooling filling process is high.

The invention provides a two-component injector based on liquid oxygen and liquid methane and an attitude control engine. The injector at least comprises an injection disc, a spark plug, a liquid oxygen collecting cavity and a liquid methane collecting cavity. The injection disc is of a double-layer panel structure with a closed cavity, a plurality of connecting columns are arranged in the cavity, and the connecting columns are uniformly distributed and connected between the upper-layer panel and the lower-layer panel; at least part of the connecting columns are provided with injection holes penetrating through the upper-layer panel and the lower-layer panel. The liquid oxygen collecting cavity and the liquid methane collecting cavity are arranged on the outer end face of the upper-layer panel and are respectively communicated with the spray pipe through injection holes formed in the connecting columns; cooling holes communicated with the liquid methane collecting cavity, the cavity and the spray pipe are formed in the upper-layer panel and the lower-layer panel. The liquid methane entering the double-layer panel structure is used for cooling the injector.

The application provides a filter pipeline automatic flushing and pressure regulating method, which can automatically identify the blockage of a filter and corresponding pipeline and automatically clean the filter without removing the filter from a pipeline system, thereby avoiding the risk of adding extra substances in the pipeline system, and particularly reducing the risk of water vapor entering a liquid oxygen and liquid methane pipeline system. The filter pipeline automatic flushing and pressure regulating method can also compensate for the pressure loss of fluid after passing through the filter, solve the problem of pressure difference before and after the filter, and meet the test scene with strict requirements on fluid pressure loss. All functions of the method can be automatically controlled, which greatly shortens the operation time, saves the labor cost, and reduces the possibility of adding extra substances in the pipeline system.

A process and apparatus (100) for producing nitrogen-purified liquid methane from a feed gas stream (1) containing at least 98 mol% methane and between 0.1 and 2 mol% nitrogen, wherein the feed gas stream (1) is cooled to a temperature between 110 K and 200 K in a first counter-current heat exchanger (3) with a nitrogen vapor stream (9) to produce a cooled stream (5), a liquid nitrogen bath (21) is in heat exchange with the cooled stream (5) via a second heat exchanger (7) through which the cooled stream (5) passes, the liquid nitrogen bath (21) producing nitrogen vapor (9) supplied to the first heat exchanger (3) to produce the cooled stream, the cooled stream (5) exiting the second heat exchanger (7) is introduced into a distillation column (11) for distillation, and a liquid (13) containing at least 99.5% mol, preferably at least 99.9% mol,Methane is drawn off from the distillation column (11) in the tank as the final product. (Shorthand figure: Fig. 1)

The utility model belongs to the technical field of chemical production equipment, and particularly relates to a device for recycling methane in liquid nitrogen wash feed gas, which comprises a liquid nitrogen wash feed gas system, a feed gas separator, a nitrogen wash tower, a liquid methane pump, a high-pressure nitrogen cooler, a first feed gas cooler, a second feed gas cooler and a methane gas pipe network, the liquid nitrogen wash raw material gas system is connected with a raw material gas separator through a raw material gas pipeline, the raw material gas pipeline penetrates through a first raw material gas cooler and a second raw material gas cooler, and the raw material gas separator is connected to the lower section of a nitrogen wash tower through a first outlet pipeline and connected to the inlet end of a liquid methane pump through a second outlet pipeline. The nitrogen washing tower is connected to the second outlet pipeline through a first methane pipeline, and the outlet end of the liquid methane pump is connected to the methane gas pipe network through a second methane pipeline. The device overcomes the defect of high energy consumption of the original process, can greatly reduce the energy consumption, reduces the production cost, and achieves the purpose of energy conservation.

The application provides a full supercooled liquid methane filling system, which comprises a refrigerant filling module, a supercooled liquid methane module and a liquid methane filling module. The refrigerant filling module is connected with a liquid methane supercooling tank of the supercooled liquid methane module through a filling pipeline, and is used for supercooling the liquid methane in the liquid methane tank. The supercooled liquid methane module is connected with the liquid methane filling module through a pipeline, and is used for filling the rocket tank with the supercooled liquid methane. The liquid methane supercooling tank comprises a liquid methane tank and a heat preservation layer outside the liquid methane tank, and a refrigerant interlayer is arranged between the liquid methane tank and the heat preservation layer, which is used for containing the refrigerant provided by the refrigerant filling module and cooling the liquid methane in the liquid methane tank. The filling system can improve the supercooling efficiency of the liquid methane, and the liquid methane will not crystallize. The supercooling process is stable and efficient, and the supercooling filling process has high economic benefits.

The application provides a full supercooled liquid methane filling method, which comprises the following steps: cold agent transfer filling: a cold agent tank truck fills cold agent into a cold agent filling module through a pipeline; cold agent filling: the cold agent filling module connects a liquid methane supercooling tank of a supercooled liquid methane module through a filling pipeline, and cold agent filling is performed; liquid methane transfer filling: a liquid methane tank truck fills liquid methane into the liquid methane supercooling tank of the supercooled liquid methane module through a pipeline; liquid methane supercooling: liquid methane in the liquid methane supercooling tank is cooled by heat exchange with the cold agent through a spaced metal wall; supercooled liquid methane filling: the supercooled liquid methane module is connected to a liquid methane filling module through a pipeline, and the liquid methane supercooling tank is pressurized to fill the liquid methane cooled in the liquid methane supercooling tank into a rocket tank; the liquid methane supercooling tank comprises a liquid methane tank and a heat preservation layer outside the liquid methane tank, and a cold agent interlayer is arranged between the liquid methane tank and the heat preservation layer to accommodate the cold agent provided by the cold agent filling module and cool the liquid methane in the liquid methane tank. The filling system can improve the liquid methane supercooling efficiency, does not cause liquid methane crystallization, and is stable and efficient in the supercooling process and has high economic benefits in the supercooled filling process.

This invention discloses a system for the integrated utilization of liquid oxygen and liquid methane, comprising a liquid oxygen component, a liquid methane component, a combustion energy component, a second heat exchanger, an oxygen storage tank component, a methane storage tank component, and a CO2 storage tank component. The inlet end of the combustion energy component is connected to the liquid oxygen component and the liquid methane component. CO2 generated after the liquid oxygen and liquid methane are mixed and combusted in the combustion energy component is input to the inlet end of the second heat exchanger via a pipeline. The liquid oxygen component and the liquid methane component are also connected to the inlet end of the second heat exchanger, and the outlet end of the second heat exchanger is connected to the oxygen storage tank component, the methane storage tank component, and the liquid CO2 storage tank component, respectively. This invention also discloses a method for using the integrated utilization system of liquid oxygen and liquid methane. The beneficial effects of this invention are: carbon capture and zero emissions are achieved; the system has multiple products, high comprehensive utilization rate, and good economic benefits.

The application belongs to the technical field of cryogenic propellant filling, and discloses a test system and method for testing liquid methane transient filling of a large-capacity cavity pipeline, wherein the test system for testing liquid methane transient filling of a large-capacity cavity pipeline comprises a liquid methane storage unit, a liquid methane supply unit, a nitrogen supply unit, a liquid methane pressurizing unit, a liquid methane filling unit, a liquid methane recovery unit, a liquid methane PLC control unit, a liquid methane visual observation unit and a data monitoring unit; the application can carry out test and measurement on the process of filling a large-capacity cavity pipeline at room temperature by liquid methane, and obtain the pipeline flow rate and the temperature and pressure values of each section of the pipeline during the filling process, so as to accurately predict the changes of each physical quantity in the pipeline during the starting process of a rocket engine and determine a reasonable ignition timing.

The application discloses a liquid oxygen / liquid methane ground test system satisfying the requirement of co-base zero evaporation storage, which comprises an outer cylinder wall, a large-area cold screen hung in the inner part of the outer cylinder wall, a liquid nitrogen cavity, a hot water cavity arranged outside the outer cylinder wall, a liquid methane cavity and a liquid oxygen cavity hung in the large-area cold screen, and the liquid methane cavity and the liquid oxygen cavity jointly form a liquid oxygen / liquid methane co-base storage tank. The application measures the influence of different materials on the storage state of liquid oxygen / liquid methane propellant by changing the co-base interlayer material between the liquid oxygen / liquid methane cavities; the balance of the liquid oxygen / liquid methane state in the zero evaporation storage process is destroyed by controlling the opening and closing of oxygen / methane exhaust valves, and the state change of the liquid oxygen / liquid methane in the balance recovery process is measured; the liquid oxygen and liquid methane are obtained by in-situ liquefaction of oxygen / methane gas by using liquid nitrogen, the purchase and transportation of dangerous liquid oxygen / liquid methane are omitted, and the safety in the test process is improved; the heat flux density entering the storage tank through the refrigeration system and the multilayer thermal insulation material when the refrigeration machine is turned off is measured according to the low-temperature fluid steady evaporation method. By controlling the thermal boundary temperature simulation screen and the vacuum control valve in the system, the liquid oxygen / liquid methane propellant co-base zero evaporation storage state can be tested under different thermal boundary temperatures and different vacuum degrees.

The invention relates to the technical field of natural gas cryogenic helium extraction, in particular to a natural gas cryogenic helium extraction system and method. The system comprises a heat exchange unit, a helium extraction unit and a pressurization unit, the heat exchange unit comprises a main heat exchanger connected with the helium extraction unit and the pressurization unit, and a supercooling heat exchanger connected with the main heat exchanger and the helium extraction unit. After the helium extraction unit separates the material, a helium material flow is formed at the top, and a liquid methane material flow is formed at the bottom; wherein the helium material flow serves as a cold source, enters the supercooling heat exchanger through the second heat exchange pipeline, enters the main heat exchanger through the second conveying pipeline after heat exchange of the supercooling heat exchanger, and obtains a crude helium material flow after heat exchange of the main heat exchanger; and S3, the liquid methane material flow is divided into a material flow I entering the main heat exchanger and a material flow II entering the supercooling heat exchanger. Helium extraction of natural gas can be achieved, the technological process is simple, and energy consumption is low.

The invention belongs to the technical field of low-temperature propellant filling, and discloses a test system and method for transient filling of a large-cavity pipeline with test liquid methane. The test system for testing the liquid methane transient filling large-cavity pipeline comprises a liquid methane storage unit, a liquid methane supply unit, a nitrogen supply unit, a liquid methane pressurization unit, a liquid methane filling unit, a liquid methane recovery unit, a liquid methane PLC control unit, a liquid methane visual observation unit and a data monitoring unit. According to the invention, the experimental test can be carried out in the process of filling the normal-temperature large-cavity pipeline with liquid methane, and the pipeline flow and the temperature and pressure values of each section of the pipeline in the filling process are obtained, so that the change of each physical quantity in the pipeline in the starting process of a rocket engine is accurately predicted, and a reasonable ignition time sequence is determined.

The application relates to a supercooled liquid methane filling system and a use method, which comprises at least a liquid nitrogen uniform dispersion circulating type liquid methane supercooler. The supercooler comprises a supercooler shell and a heat exchange core arranged in the supercooler shell, the heat exchange core is communicated with a liquid methane entering communication pipe and a liquid methane flowing-out communication pipe, the supercooler shell is communicated with a nitrogen gas flowing-out communication pipe and a liquid nitrogen backflow communication pipe; a spraying mechanism is arranged above the heat exchange core in the supercooler shell, the liquid nitrogen backflow communication pipe is communicated with a backflow pipeline, the backflow pipeline is communicated with a first port of a first three-way pipe at the tail end, a second port of the first three-way pipe is communicated with a liquid nitrogen entering communication pipe, and a third port of the first three-way pipe is communicated with the spraying mechanism; the spraying mechanism is used for spraying liquid nitrogen to the inner wall of the supercooler shell and the heat exchange core; and the inner wall of the supercooler shell is provided with a liquid level meter. The application can avoid liquid methane crystallization, reduce time cost and avoid large waste of liquid methane.

The application discloses a liquid methane rapid subcooling device and a method thereof. In the device, a spiral tapering methane pipeline is divided into multiple parts through open containers with gradually increasing diameters. When the outlet temperature of the methane is regulated, the liquid level in the open containers is adjusted from top to bottom. Since the volume of the liquid nitrogen medium in the upper open container is small, the response is very fast during temperature regulation. Meanwhile, when the liquid level in the open container is lowered to a certain value, the boiling heat transfer coefficient of the pipeline surface will obviously increase with the decrease of the liquid level, that is, there is a critical liquid level in each open container, which can improve the boiling heat transfer coefficient of the liquid nitrogen medium as a whole. The sparse needle ribs arranged at the front end of the spiral tapering methane pipeline can effectively overcome the gas film heat transfer weakening phenomenon caused by strong boiling due to large subcooling degree, and the dense needle ribs at the rear end can increase the bubble generation rate under small subcooling degree.

This invention discloses an apparatus and method for producing hydrogen and co-producing LNG using cryogenic methane washing. The apparatus includes a main heat exchanger, a heavy hydrocarbon separator, a cryogenic flash tank, an MRC cryogenic separator, a cryogenic separator, a methane washing tower, a hydrogen stripping tower, a hydrogen stripping tower reboiler, a carbon monoxide / methane separation tower, a bottom reboiler, a reflux tank, a top condenser, a liquid methane pump, a nitrogen compression system, and a mixed refrigerant compressor system. This invention effectively recovers CO from hydrogen-rich gas, achieving a hydrogen purity of over 97%, effectively reducing the requirements for PSA hydrogen extraction and decreasing investment. Furthermore, the hydrogen stripping tower further recovers hydrogen from the methane-rich gas, achieving a hydrogen yield greater than 98%.

The invention discloses a wide-range reusable scramjet engine and a reusable method, and belongs to the technical field of scramjet engines. The wide-range reusable scramjet engine comprises a supersonic combustion chamber, and regeneration cooling pipelines are arranged on the inner wall of the supersonic combustion chamber and in a center supporting plate; the kerosene fuel system comprises a kerosene fuel tank and a kerosene pump, the kerosene fuel tank is communicated with a kerosene direct injection flow path and a kerosene regeneration cooling flow path through the kerosene pump, the kerosene direct injection flow path is communicated with a kerosene nozzle of the supersonic combustion chamber expansion section, and the kerosene regeneration cooling flow path is communicated with a regeneration cooling pipeline; the liquid methane fuel system comprises a liquid methane fuel tank and a liquid methane fuel pump, the liquid methane fuel tank is communicated with the liquid methane cooling regeneration cooling flow path through the liquid methane fuel pump, and the liquid methane regeneration cooling flow path is communicated with the regeneration cooling pipeline. By the adoption of the wide-range reusable scramjet engine and the reuse method, the problem of reuse of the scramjet engine can be solved.

The invention provides an adjustable cavitation pipe and an aerospace engine system, and belongs to the technical field of aerospace engines. The adjustable cavitation pipe comprises a pushing mechanism, a plug cone, a valve body connector, a valve body and a cavitation pipe body. The plug cone is coaxially arranged in the shell and the cavitation pipe, the head of the plug cone extends into the throat of the cavitation pipe, and the root of the plug cone is connected with the output end of the pushing mechanism and can reciprocate along the axis. The key lies in that the head of the plug cone is a special curved cone, and the radius is linearly increased along with the square root of the axial distance from the top end. By means of the structure, the displacement of the plug cone and the annular throttling area of the throat are in a linear relation, and then linear correspondence between the displacement and the flow of low-temperature media (such as liquid oxygen, liquid nitrogen and liquid methane) is achieved under the cavitation working condition. The linear characteristic remarkably simplifies a control algorithm, so that the system can directly and accurately convert a flow instruction into a displacement action, high-precision continuous or stepped flow regulation is efficiently realized, and the response speed, the control precision and the operation stability of a variable working condition test are greatly improved.

The invention relates to a liquid methane filling system utilizing liquid nitrogen to perform segmented synchronous pre-cooling and a pre-cooling method thereof. The liquid methane filling system comprises a liquid methane storage tank, a liquid methane storage tank, a liquid methane filling pipeline, a liquid nitrogen heat exchanger and a measurement and control system, the liquid methane filling pipeline comprises a lower pipeline, a middle pipeline and an upper pipeline which are connected in sequence, the lower pipeline is connected to the liquid methane storage tank, the upper pipeline is connected to the liquid methane storage tank, and the upper pipeline or the middle pipeline is connected with a nitrogen filling pipeline; the liquid nitrogen heat exchanger is filled with liquid nitrogen; the measurement and control system is used for monitoring the temperature and pressure of the lower pipeline, the middle pipeline, the upper pipeline and the liquid methane storage tank in real time. According to the system, an existing heat exchanger is used for providing liquid nitrogen or low-temperature nitrogen, injection is started from the middle-upper pipeline of the liquid methane injection pipeline, and the system has the advantages of reducing liquid methane emission, improving the pre-cooling efficiency, being high in system integration degree and the like and can be expanded to synchronous pre-cooling of the liquid oxygen injection pipeline; the precooling device is particularly suitable for efficient precooling of a low-temperature propellant filling system using liquid oxygen and liquid methane combination.

This invention provides an engine test bench tank pressure boosting and depressurization system, comprising: a nitrogen source, a pressure regulating and distribution plate, a safety boosting module, a gas distribution control module, an airtightness module, a liquid oxygen / liquid methane tank, and an exhaust gas module. The nitrogen source is connected to the pressure regulating and distribution plate via a gas delivery pipeline from a storage tank for gas distribution and pressure regulation. The pressure regulating and distribution plate is sequentially connected to the safety boosting module, the gas distribution control module, and the liquid oxygen / liquid methane tank along the gas delivery direction via a nitrogen boosting pipeline, achieving boosting and gas distribution. The exhaust gas module is connected to the liquid oxygen / liquid methane tank for the safe discharge of gas from the tank. Before testing, the system can perform airtightness testing on the boosting pipeline using the airtightness module to ensure the accuracy of the boosting process control. The multiple boosting pipelines can be flexibly adjusted according to boosting requirements, ensuring the accuracy and stability of boosting.