CN114977723A - Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system - Google Patents

Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system Download PDF

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CN114977723A
CN114977723A CN202210833781.7A CN202210833781A CN114977723A CN 114977723 A CN114977723 A CN 114977723A CN 202210833781 A CN202210833781 A CN 202210833781A CN 114977723 A CN114977723 A CN 114977723A
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alkali metal
inert gas
stainless steel
conveying pipeline
liquid alkali
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朱培奇
彭爱武
刘保林
沙次文
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K44/00—Machines in which the dynamo-electric interaction between a plasma or flow of conductive liquid or of fluid-borne conductive or magnetic particles and a coil system or magnetic field converts energy of mass flow into electrical energy or vice versa
    • H02K44/08—Magnetohydrodynamic [MHD] generators
    • H02K44/18—Magnetohydrodynamic [MHD] generators for generating AC power
    • H02K44/22—Magnetohydrodynamic [MHD] generators for generating AC power by changing the conductivity of the fluid
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
    • C23C14/48—Ion implantation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/10—Nuclear fusion reactors

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Abstract

A multi-path parallel quantitative flow equalization synchronous injection alkali metal seed system comprises a programmable high-pressure injection pump, a multi-path parallel liquid alkali metal conveying pipeline system, a multi-path parallel inert gas supply and conveying pipeline system, a pneumatic atomization seed injection ring, an inert gas heating furnace system and a ferromagnetic shielding cover. The programmable high-pressure injection pump actuating mechanism simultaneously and quantitatively pushes N high-pressure stainless steel injectors filled with liquid alkali metal seeds to output the liquid alkali metal seeds according to a set program, the liquid alkali metal seeds enter N corresponding pneumatic atomizing spray guns of a pneumatic atomizing seed injection ring through N corresponding liquid alkali metal conveying pipelines, directly reach an end mixing chamber of each spray gun, are mixed and atomized with inert gas input into the end mixing chamber of each pneumatic atomizing spray gun from N inert gas supply and conveying pipelines, and are injected into the injection ring. The invention can realize quantitative flow equalization multi-path synchronous injection of alkali metal seeds according to requirements, and further realize uniform mixing and sufficient ionization of the alkali metal seeds and the main airflow.

Description

Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system
Technical Field
The invention relates to an alkali metal seed injection system of a magnetohydrodynamic generator, belonging to the technical field of inert gas plasma magnetohydrodynamic power generation.
Background
The magnetohydrodynamic power generation is a novel power generation mode for directly converting heat energy into electric energy, and the basic working principle is Faraday's law of electromagnetic induction. For the difference of using conducting fluid working medium, the magnetohydrodynamic power generation can be divided into combustion gas plasma magnetopower generation, inert gas plasma magnetopower generation, liquid metal magnetopower generation and the like. When the nuclear energy is used as a heat source, the high heat generated by the nuclear energy can be fully utilized by the inert gas plasma power generation, the total temperature and the total pressure of the inert gas are increased, and pressure difference is formed at two ends of the magnetofluid power generation channel, so that a flow field is formed. The inert gas plasma rapidly flows through the power generation channel to cut the magnetic force line of the magnetic field in the vertical direction, induced electromotive force is generated between the electrodes on the two sides of the channel, and power is generated under the condition of external load.
In the inert gas plasma power generation process, in order to improve the conductivity of the plasma and greatly improve the performance of magnetofluid power generation, a certain amount of alkali metal is required to be added into the inert gas to be used as an ionization seed. The mole fraction of alkali metal to the total gas mixture is referred to as the seed fraction. For a nuclear-driven disk-type magnetohydrodynamic generator, the optimal seed fraction is generally several thousandths to ten-thousandths to realize high conductivity and stable non-equilibrium ionization. In order to enable the main air flow working medium to work within the optimal seed fraction working range, the seed fraction of the main air flow working medium needs to be strictly controlled. For practical experimental research devices, the flow rate of alkali metal can be as low as a few milligrams per minute. Therefore, how to perform quantitative micro-flow injection of alkali metal seeds is a big difficulty. Meanwhile, in order to ionize the alkali metal seeds in the inert gas mixture quickly and sufficiently and obtain a uniform and stable main plasma airflow working medium, the alkali metal seeds and the main airflow need to be mixed uniformly in space, and the injection method of the alkali metal seeds is a key problem.
The existing alkali metal injection is mostly in a mode of carrying out alkali metal steam by carrier gas or driving alkali metal liquid drops by carrier gas, such as a seed injection system adopted by a large disc generator test in east China as shown in figure 1 and an alkali metal seed injection device of Chinese patent ZL201910947699.5 shown in figure 2, wherein a heating furnace is adopted to heat liquid alkali metal to generate alkali metal steam, then carrier gas is introduced to carry out alkali metal steam to form mixed gas of carrier gas and alkali metal steam, and the mixed gas is injected into main gas flow through a water cooling cylinder and a nozzle. The mixed gas of carrier gas and alkali metal steam is required to pass through a slender conveying pipe and a water-cooled main airflow cylinder, the alkali metal steam is condensed into liquid in the process, meanwhile, due to the compressibility of the gas, the flow rate of the mixed gas is also inevitably influenced by the pressure fluctuation of the main airflow, the amount of the alkali metal steam carried in the mixed gas is related to the pressure of the carrier gas and the vaporization process, the flow rate of the mixed gas injected into the main airflow is related to the injection pressure and the main airflow pressure, and is influenced by the pressure fluctuation of the carrier gas and the main airflow, the actually injected flow rate is difficult to control and determine, the ionization of seeds is seriously influenced, so that the conductivity of a power generation working medium is low, and the power output and experimental research of a generator are influenced.
Although the injection system of pure alkali metal seeds of the inert gas plasma magnetohydrodynamic generator shown in fig. 3 refers to the application of an injector to output quantitative alkali metal, the injection system uses a mixer to mix carrier gas with liquid alkali metal sent by the injector to bring alkali metal droplets out, the carrier gas and the alkali metal droplets pass through a long and thin pipeline, the length of the pipeline is generally more than 1.5 meters due to the need of avoiding the influence of a strong magnetic field of the magnetohydrodynamic generator, and then the pipeline passes through a water-cooled main airflow cylinder, and the two-phase flow is also inevitably subjected to gas-liquid separation in a conveying pipe and presents a state of one section of liquid and one section of gas. And because of the compressibility of the gas, the fluctuation of the flow rate of the seeds is also caused when the main air flow fluctuates, and the actual flow rate of the injected seeds is fluctuated and is not equal to the flow rate quantitatively pushed out by the injector.
The chinese patent publication No. CN113346708A shown in fig. 4 solves the problem of stable total flow rate of seed injection in the system, but because the injection system uses a one-way N adapter, it cannot ensure that the alkali metal seed split flow rates in each branch pipeline are equal to each other after the adapter is connected; and because the pneumatic atomizing spray guns on the pneumatic atomizing seed injection ring are different in height, the flow of the alkali metal seeds distributed into each pneumatic atomizing spray gun is not equal to each other due to the action of pressure difference caused by gravity, even if some seeds are not output in the pneumatic atomizing spray guns at the higher positions of the pneumatic atomizing seed injection ring, the alkali metal seeds are cut off, and because the branch pipelines corresponding to the spray guns with different heights are different in length and the difference of the spray gun structures cannot ensure that the seeds in each pneumatic atomizing spray gun are sprayed out simultaneously, the spatial uniform distribution of the alkali metal seeds when the alkali metal seeds are mixed with the main gas flow cannot be ensured, the spatial distribution of the alkali metal seeds is uneven, the optimal seed fraction condition cannot be met, the high conductivity of the inert gas plasma cannot be met in space, and the performance of the generator is greatly reduced. And because only one liquid metal seed pipeline and one inert gas supply and delivery pipeline are provided, if the pipelines are blocked or corresponding valves are in failure, the whole system cannot be operated continuously, which is a defect of the system disclosed in the patent.
In summary, in the above prior art, the total flow of the alkali metal seeds injected into the main gas flow is not accurate and unstable, or the flow of each injection branch of the alkali metal seeds is not accurate and unstable, or each injection branch of the alkali metal seeds cannot realize synchronous injection, so that the real accurate quantitative synchronous delivery and spatial uniform mixing of the micro flow of the alkali metal cannot be realized.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a multi-path parallel quantitative flow equalization synchronous injection alkali metal seed system. The invention adopts a programmable high-pressure stainless steel injection pump to quantitatively output liquid alkali metal seeds, and injects the liquid alkali metal seeds into the main air flow through a liquid alkali metal conveying pipeline system and a pneumatic atomization seed injection ring which are connected in parallel in a multipath way in the whole process. The liquid alkali metal seeds are all kept in a liquid state in the whole process from being output from the injection pump to the mixing chamber at the front end of the nozzle for injecting the main air flow, and due to the quantitative output characteristic of the injection pump and the incompressible characteristic of the liquid, the flow of the liquid alkali metal seeds injected into the main air flow is not influenced by the pressure fluctuation of the main air flow, so that the flow of the liquid alkali metal seeds can be accurately pushed, and the trace quantitative injection is realized. Because the lengths of all the branches of the liquid alkali metal conveying pipeline are the same, the internal and external cross-sectional areas of the pipeline are the same, the inert gas supply is the same as the internal and external cross-sectional areas of the conveying pipeline, on the premise that the seed flow rates of all the branches of the liquid alkali metal conveying pipeline are the same, the flowing time of liquid alkali metal seeds in the pipeline is the same, and the conveying of the liquid alkali metal seeds is synchronous. The system adopts a multi-path parallel mode, each injector corresponds to one spray gun, the flow of each spray gun is the same and the problem of flow interruption does not exist, the seed fraction of the main gas flow gas mixture is kept uniform and stable in space, and the accurate requirements of the unbalanced ionization condition of the disc type magnetohydrodynamic generator on the seed quantity and the seed space distribution are met.
In order to achieve the purpose, the invention adopts the following technical means:
a multi-path parallel quantitative flow-equalizing synchronous injection alkali metal seed system comprises a programmable high-pressure stainless steel injection pump (1), a multi-path parallel liquid alkali metal conveying pipeline system (2), a multi-path parallel inert gas supply and conveying pipeline system (3), a pneumatic atomization seed injection ring (4) and an inert gas heating furnace system (5), wherein the output port of the programmable high-pressure stainless steel injection pump (1), the input port and the output port of the multi-path parallel liquid alkali metal conveying pipeline system (2), the input port and the output port of the multi-path parallel inert gas supply and conveying pipeline system (3), a bypass purging port and the number of pneumatic atomization spray guns of the pneumatic atomization seed injection ring (4) are the same; the inert gas heating furnace system (5) comprises a high-pressure inert gas source (5-1) and an inert gas heating furnace (5-2); the inert gas is conveyed from a high-pressure inert gas source (5-1) to an inert gas heating furnace (5-2) for heating, and then conveyed to a plurality of paths of parallel inert gas supply and conveying pipeline systems (3) for shunting; liquid alkali metal seeds are simultaneously pushed and output from needle cylinders of N high-pressure stainless steel injectors (1-1) of a programmable high-pressure stainless steel injection pump (1), N is an integer larger than 1, the liquid alkali metal seeds enter N pneumatic atomizing spray guns (4-1) of a pneumatic atomizing seed injection ring (4) through N parallel branches of a corresponding multi-path parallel liquid alkali metal conveying pipeline system (2) and reach a spray gun end mixing chamber, the liquid alkali metal seeds are mixed with inert gas which is input into the spray gun end mixing chamber through the multi-path parallel inert gas supply and conveying pipeline system (3), the inert gas rotates, the liquid alkali metal seeds are pneumatically atomized and are sprayed out from a nozzle of the spray gun end mixing chamber, the spraying direction is intersected with main air flow in the injection ring at an angle of 90 degrees, and the liquid alkali metal seeds are injected into the pneumatic atomizing seed injection ring (4); the N pneumatic atomizing spray guns (4-1) correspond to N liquid alkali metal conveying pipelines, N inert gas conveying pipelines and N bypass purging branches, N is an integer larger than 1, each pneumatic atomizing spray gun (4-1) is provided with and only corresponds to only 1 liquid alkali metal conveying pipeline, 1 inert gas supply and conveying pipeline and 1 bypass purging branch, and the liquid alkali metal seed flow of each liquid alkali metal conveying pipeline is the same.
The alkali metal seed system comprises a programmable high-pressure stainless steel injection pump, a multi-path parallel liquid alkali metal conveying pipeline system, a multi-path parallel inert gas supply and conveying pipeline system, a pneumatic atomization seed injection ring, an inert gas heating furnace system and a ferromagnetic shielding cover.
The programmable high-pressure stainless steel injection pump is connected with a multi-path parallel liquid alkali metal conveying pipeline system, and has the functions of liquid alkali metal seed storage and quantitative conveying. The two ends of the multi-path parallel liquid alkali metal conveying pipeline system are respectively connected with the programmable high-pressure stainless steel injection pump and the pneumatic atomization seed injection ring, and the multi-path parallel liquid alkali metal conveying pipeline system has the function of conveying liquid alkali metal seeds. One end of the multi-path parallel inert gas supply and conveying pipeline system is connected with the multi-path parallel liquid alkali metal conveying pipeline system, the other end of the multi-path parallel inert gas supply and conveying pipeline system is connected with the pneumatic atomizing seed injection ring, and the multi-path parallel inert gas supply and conveying pipeline system has the functions of supplying and conveying inert gas carrier gas. The pneumatic atomization seed injection ring is respectively connected with a plurality of paths of liquid alkali metal conveying pipeline systems connected in parallel and a plurality of paths of inert gas supplies connected in parallel and the conveying pipeline systems, is positioned at the tail end of the whole alkali metal seed system, mixes and atomizes liquid alkali metal seeds and inert gas carrier gas, sprays the atomized mixture into the main air flow, and is in right-angle intersection with the high-temperature main air flow to be mixed, and the alkali metal seeds are uniformly distributed in the main air flow.
The programmable high-pressure stainless steel injection pump comprises N high-pressure stainless steel injectors, 1 stepping motor executing mechanism, 1 control transmission line, 1 remote controller and N injector special valves, wherein N is an integer larger than 1. N high-pressure stainless steel injectors are fixed on the stepping motor executing mechanism; the stepping motor actuating mechanism is connected with the remote controller through a control transmission line. The front end of the high-pressure stainless steel injector is a syringe head, the rear end of the high-pressure stainless steel injector is a piston handle, the N injector special distribution valves are arranged at the front ends of the syringe heads of the N high-pressure stainless steel injectors, and each high-pressure stainless steel injector is matched with one injector special distribution valve. The special valve of the injector is a ball valve or an electromagnetic valve driven by a motor. The shell of the needle cylinder of the high-pressure stainless steel injector is heated by a constant-temperature electric tracing band, and the heating temperature is 20-30 ℃ higher than the melting point of alkali metal.
The stepping motor executing mechanism is connected to the remote controller through an RS485 port by a control transmission line, a program instruction preset by the remote controller is transmitted to the stepping motor executing mechanism, the stepping motor executing mechanism pushes N high-pressure stainless steel injector piston handles to move forwards simultaneously, liquid alkali metal seeds in N high-pressure stainless steel injector needle cylinders are pushed to a liquid alkali metal conveying pipeline system connected in parallel in a multi-way mode at a constant speed and in a quantitative mode, and N is an integer larger than 1.
The multi-path parallel liquid alkali metal conveying pipeline system comprises N first tee joints, N one-way valves and a liquid alkali metal conveying pipeline, wherein N is an integer larger than 1. The liquid alkali metal conveying pipeline comprises a plurality of sections of stainless steel pipes. One end of each of the N first three-way joints is connected with a special valve of an injector through a stainless steel pipe, one end of each first three-way joint is connected with a bypass purge valve outlet of the conveying pipeline system through the stainless steel pipe and a plurality of paths of parallel inert gas supplies, and the other end of each first three-way joint is connected with a first one-way valve through the stainless steel pipe. The inlet ends of the N first one-way valves are connected with an upstream first three-way joint through stainless steel pipes, and the outlet ends of the N first one-way valves are connected with N liquid alkali metal inlet joints of the pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring through the stainless steel pipes. The liquid alkali metal conveying pipeline system with multiple parallel circuits is heated by a constant-temperature electric tracing band in the whole process, and the heating temperature is about 20-30 ℃ higher than the melting point of the alkali metal so as to keep the alkali metal in the pipeline in a liquid state. The lengths of all branches of the liquid alkali metal conveying pipeline are the same, and the internal and external cross-sectional areas of the pipeline are the same.
The multi-path parallel inert gas supply and conveying pipeline system comprises 2N-1 second three-way connectors, N bypass purging valves, N inert gas switching electromagnetic valves, a second one-way valve and an inert gas conveying pipeline, wherein N is an integer larger than 1. The inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes. The 2N-1 second three-way joints are connected in series with each other through stainless steel pipes and are sequentially arranged from upstream to downstream according to the sequence of the serial numbers 1 to 2N-1, and the third ends of the 1 st to Nth second three-way joints are respectively connected with inlets of the N bypass purge valves through the stainless steel pipes. And the third ends of the (N + 1) th to the (2N-1) th second three-way joints are respectively connected with inlets of the N inert gas switching electromagnetic valves through stainless steel pipes. The first end of the 1 st second three-way joint is connected with the outlet of the second one-way valve through a stainless steel pipe. And the inlet of the second one-way valve is connected with the inert gas outlet of the inert gas heating furnace. And the second end of the 2N-1 second three-way joint is connected with the inlet of the 1 inert gas switching electromagnetic valve through a stainless steel pipe. And outlets of the N inert gas switch electromagnetic valves are connected with inert gas inlet connectors of the N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring through stainless steel pipes. And outlets of the N bypass purge valves are connected with N first three-way joints of the multi-path parallel liquid alkali metal conveying pipeline system through stainless steel pipes, and the bypass purge valves are ball valves or electromagnetic valves driven by a motor. The whole course of the multi-path parallel inert gas supply and conveying pipeline system is heated by a constant temperature electric tracing band, the heating temperature is 20-30 ℃ higher than the melting point of the alkali metal, the temperature of the inert gas in the inert gas supply and conveying pipeline is kept, and the alkali metal is not solidified and the pipeline is not blocked due to heat exchange when the inert gas is mixed with the alkali metal. The inert gas supply is the same as the internal and external cross-sectional areas of the transfer line.
The pneumatic atomization seed injection ring comprises N pneumatic atomization spray guns and an injection ring flange. N is an integer greater than 1, and N pneumatic atomizing spray guns with the same size and specification are uniformly distributed on the circumference of the injection ring flange and penetrate through the outer wall of the injection ring flange along the radial direction, and the front end face of each pneumatic atomizing spray gun is flush with the inner wall of the injection ring flange or slightly retracts into the inner wall by 1-2 mm. The pneumatic atomization seed injection ring is provided with a sensor for monitoring the temperature of the pneumatic atomization seed injection ring, and the pneumatic atomization seed injection ring is heated by high-temperature main air flow flowing through the injection ring so as to ensure that the temperature of the spray gun works above the melting point temperature of the alkali metal seeds and keep the alkali metal seeds in the spray gun in a liquid state.
The pneumatic atomization spray gun is composed of a liquid alkali metal inlet joint, an atomization gas inlet joint, a pneumatic nozzle front end mixing chamber, an inner pipeline and an outer pipeline. The liquid alkali metal inlet joint is positioned right behind the nozzle of the pneumatic atomizing spray gun, and the atomizing gas inlet joint is positioned at the position, close to the tail end, of the pneumatic atomizing spray gun. The liquid alkali metal is introduced into the mixing chamber at the front end of the pneumatic atomizing spray gun through the inner pipeline of the pneumatic atomizing spray gun, and the inert gas is introduced into the mixing chamber at the front end of the pneumatic atomizing spray gun through the outer pipeline of the pneumatic atomizing spray gun.
The mixing chamber at the front end of the pneumatic nozzle is directly connected with an inner pipeline and an outer pipeline of the pneumatic atomizing spray gun respectively, the inert gas in the outer pipeline flows forwards in a spiral mode, the liquid alkali metal in the mixing chamber at the front end of the pneumatic nozzle is broken, dispersed and atomized under the driving of the inert gas and is uniformly mixed with the inert gas, the liquid alkali metal is sprayed out from a nozzle of the mixing chamber at the front end of the pneumatic nozzle under the driving of high pressure and is sprayed into the main gas flow, the liquid alkali metal and the high-temperature main gas flow are in right-angle intersection and mixed, and alkali metal seeds are uniformly distributed in the main gas flow. Because the whole course of the multi-path parallel liquid alkali metal conveying pipeline system is filled with incompressible alkali metal liquid, the alkali metal liquid is output from the injector, passes through the pipeline and the valve, and keeps liquid state in the whole course of the mixing chamber at the front end of the pneumatic atomization spray gun, the flow of the conveyed alkali metal is stable, the output flow of the injection pump is constantly output according to the programmed sequence as long as the pushing force does not exceed the maximum pushing force of the high-pressure stainless steel injection pump, the pressure fluctuation of the main air flow is irrelevant, the actually injected seed flow is the same as the seed flow pushed by the injection pump, and therefore, the quantitative space-time uniform alkali metal seed injection is realized.
The inert gas heating furnace system comprises a high-pressure inert gas source, an inert gas heating furnace and an inert gas conveying pipeline. The inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes. The high-pressure inert gas source is connected to an inert gas inlet of the inert gas heating furnace through a section of inert gas conveying pipeline, and an inert gas outlet of the inert gas heating furnace is connected to a second one-way valve inlet of the multi-path parallel inert gas supply and conveying pipeline system. The inert gas heating furnace has a working temperature of 300-700 ℃, a working voltage of 220V alternating current, a three-layer design, an outer layer of a stainless steel shell, a middle layer of heat-preservation asbestos and a heating coil, an inner layer of an iron cylindrical container, and an inert gas inlet and an inert gas outlet in the container. The inert gas heating furnace can preheat the inert gas in the furnace before the alkali metal seed system operates, the flowing temperature of the inert gas is higher in the long-time operation process of the system, the liquid alkali metal seeds are prevented from being cooled and solidified and blocking the spray gun when the inert gas and the liquid alkali metal seeds are mixed in a mixing chamber of the pneumatic atomization spray gun, a certain outlet temperature of the spray gun is ensured, and the ionization of the alkali metal seeds is facilitated.
The multiple parallel inert gas supply and delivery pipeline system comprises a bypass purge valve, an inert gas switch electromagnetic valve, a programmable high-pressure stainless steel injection pump actuating mechanism and a special valve which are required to be arranged in a ferromagnetic shielding case. The ferromagnetic shielding cover is a hexahedral iron magnetic conduction cover and has the function of preventing the magnetic leakage field of the magnetohydrodynamic generation magnet from interfering the electric control valve and the stepping motor actuating mechanism.
The alkali metal seeds are cesium, potassium, rubidium and the like. The inert gas carrier gas is argon or helium and the like.
The invention has the following beneficial effects:
the invention adopts the programmable high-pressure stainless steel injection pump to quantitatively push the liquid alkali metal seeds at a constant speed, can set the seed pushing flow rate of the high-pressure stainless steel injection pump in the controller in advance, can give a certain value to the flow rate, and can also give a function which changes along with time, and can debug the influence of various seed quantities on the performance of the generator in one test so as to determine the optimal seed quantity.
The alkali metal seed conveying system adopts constant-temperature electric heating, the heating temperature is 20-30 ℃ higher than the melting point of alkali metal, and the alkali metal seeds are ensured to be in a liquid state in the whole conveying process from the high-pressure stainless steel injector to the front nozzle of the pneumatic atomizing spray gun. Due to the incompressible nature of the liquid, the flow of liquid alkali metal seeds injected into the main gas stream is not affected by fluctuations in the pressure of the main gas stream. The seed injection mode combining the whole-course maintenance of the liquid state conveying condition and the quantitative output performance of the programmable high-pressure stainless steel injection pump ensures the stable flow rate of the liquid alkali metal seed injection, realizes the stability of the seed fraction of the main gas working medium of the generator at a preset value, and meets the requirement that the unbalanced ionization condition and the seed quantity of the disc type magnetohydrodynamic generator are very sensitive.
The invention adopts a seed injection mode that a plurality of pneumatic atomizing spray guns are uniformly distributed on the circumference of an injection ring for multi-point injection, the injection direction is crossed with the main air flow at right angles, and a plurality of injectors are simultaneously driven by one injection pump to inject seeds, thereby realizing the uniform mixing of the seeds and the main air flow and the uniform and stable distribution of the seeds in space.
The invention adopts a pipeline multi-path parallel connection mode, a structure that N high-pressure stainless steel injector needle cylinders and a unique stepping motor actuating mechanism are fixed, N is an integer larger than 1, and the high-pressure stainless steel injector needle cylinders, the pneumatic atomizing spray guns, the liquid alkali metal conveying pipelines, the inert gas supply and conveying pipelines and the bypass purging branches are assembled in a one-to-one correspondence mode, so that the flow of liquid alkali metal seeds of each liquid alkali metal conveying pipeline and each pneumatic atomizing spray gun is ensured to be the same, the seed fraction of a main gas flow gas mixture is kept uniform and stable in space, and the accurate requirements of the unbalanced ionization condition of the disc type magnetofluid generator on the seed quantity and the seed space distribution are met. Because the pipelines are connected in parallel, when a certain branch is blocked or a valve fails, other branches are not affected, and the system can continue to operate normally.
The invention innovatively uses an inert gas heating furnace, the working temperature is 300-700 ℃, the working voltage is 220V alternating current, the heating furnace is designed into three layers, the outer layer is a stainless steel shell, the middle layer is heat-preservation asbestos and a heating coil, and the inner layer is an iron cylindrical container. The inert gas heating furnace can preheat the inert gas in the furnace before the alkali metal seed system operates, the flowing temperature of the inert gas is higher in the long-time operation process of the system, the liquid alkali metal seeds are prevented from being cooled and solidified and blocking the spray gun when the inert gas and the liquid alkali metal seeds are mixed in a mixing chamber of the pneumatic atomization spray gun, a certain outlet temperature of the spray gun is ensured, and the ionization of the alkali metal seeds is facilitated.
The invention provides that the lengths of all branches of the liquid alkali metal conveying pipeline are the same, the internal and external cross-sectional areas of the pipeline are the same, the inert gas supply is the same as the internal and external cross-sectional areas of the conveying pipeline, on the premise that the seed flow of all branches of the liquid alkali metal conveying pipeline is the same, the flow time of liquid alkali metal seeds in the pipeline is the same, the liquid alkali metal seeds are conveyed synchronously, the seeds and the main gas flow are stably and uniformly mixed, and the uniform and stable spatial distribution of the seeds is realized in a short time.
Drawings
FIG. 1 is a schematic view of a seed injection system for the east England disc Generator test in Japan;
FIG. 2 is a schematic view of an alkali metal seed injection device of patent ZL 201910947699.5;
figure 3 patent zl20150572329.x inert gas plasma mhd generator soda metal seed injection system structure diagram;
FIG. 4 is a schematic structural diagram of a quantitative uniform flow injection system for alkali metal seeds with publication number CN 113346708A;
FIG. 5 is a block diagram of the multi-channel parallel quantitative current-sharing synchronous injection alkali metal seed system of the present invention;
FIG. 6 is a schematic diagram showing an embodiment of a multi-channel parallel quantitative uniform flow synchronous injection alkali metal seeding system according to the present invention;
in fig. 5 and 6: 1 programmable high pressure stainless steel syringe pump: 1-1 high-pressure stainless steel syringe, 1-2 step motor actuating mechanism, 1-3RS485 remote control line, 1-4 remote controller, 1-5 special distribution valve, 2 liquid alkali metal conveying pipe system that the multichannel is parallelly connected: 2-1 a first three-way joint, 2-2 a first one-way valve, 3 a plurality of paths of inert gas supply and delivery pipeline systems connected in parallel: 3-1 second three way connection, 3-2 bypass purge valves, 3-3 inert gas switching solenoid valves, 3-4 second check valves, 4 pneumatic atomized seed injection rings: 4-1 pneumatic atomizing spray gun, 4-2 injection ring flange, 5 inert gas heating furnace system: 5-1 high-pressure inert gas source, 5-2 inert gas heating furnace and 6 ferromagnetic shielding cover.
Detailed Description
The invention is further described below with reference to the accompanying drawings and the detailed description.
As shown in fig. 5, the alkali metal seed quantitative injection system of the present invention comprises a programmable high-pressure stainless steel injection pump 1, a multi-path parallel liquid alkali metal delivery pipeline system 2, a multi-path parallel inert gas supply and delivery pipeline system 3, a pneumatic atomized seed injection ring 4, an inert gas heating furnace system 5, and a ferromagnetic shielding case 6.
As shown in fig. 6, the programmable high-pressure stainless steel injection pump 1 includes N high-pressure stainless steel injectors 1-1, a stepping motor actuator 1-2, an RS485 remote control line 1-3, a remote controller 1-4, and N dedicated valves 1-5, where N is an integer greater than 1, and N is equal to 5 in this embodiment. N high-pressure stainless steel injectors 1-1 are fixed on the stepping motor actuating mechanism 1-2; the stepping motor actuating mechanism 1-2 is connected with a remote controller 1-4 through an RS485 remote control line 1-3; the front end of the high-pressure stainless steel injector 1-1 is a syringe head, the rear end of the high-pressure stainless steel injector is a piston handle, N injector special valves 1-5 are arranged at the front ends of the syringe heads of the N high-pressure stainless steel injectors 1-1, and each high-pressure stainless steel injector 1-1 is provided with one injector special valve 1-5. The special valves 1-5 of the injector are ball valves or electromagnetic valves driven by a motor. The shell of the needle cylinder of the high-pressure stainless steel injector 1-1 is tightly attached to the constant-temperature electric tracing band. The stepping motor executing mechanism 1-2 is connected to the remote controller 1-4 through an RS485 port and an RS485 remote control line 1-3, a program instruction preset by the remote controller 1-4 is transmitted to the stepping motor executing mechanism 1-2 through the RS485 remote control line 1-3, the stepping motor executing mechanism 1-2 pushes piston handles of N high-pressure stainless steel injectors 1-1 to move forwards simultaneously, and liquid alkali metal in the high-pressure stainless steel injector cylinders is quantitatively pushed to the multi-path parallel liquid alkali metal conveying pipeline system 2 at a constant speed. And the RS485 remote control line 1-3 is a control transmission line.
The process of loading the high pressure stainless steel syringe with alkali seeds is as follows: the high-pressure stainless steel injector 1-1 is placed in a vacuum or argon-protected constant-temperature glove box, the temperature is raised to be higher than the melting point of alkali metal, the special valve 1-5 is opened, the piston handle of the injector is pulled backwards, liquid alkali metal seeds are sucked in, the special valve 1-5 is closed, then the temperature is reduced, and the alkali metal seeds are stored in the high-pressure stainless steel injector 1-1 in a solid state.
As shown in fig. 6, the multiple parallel liquid alkali metal conveying pipeline system 2 includes N first three-way joints 2-1, N first check valves 2-2, and a liquid alkali metal conveying pipeline, where N is an integer greater than 1, and in this embodiment, N is equal to 5. The liquid alkali metal conveying pipeline comprises a plurality of sections of stainless steel pipes. One end of each of the N first three-way joints 2-1 is connected with a special injector valve 1-5 of a programmable high-pressure stainless steel injection pump through a stainless steel pipe, one end of each first three-way joint is connected with an outlet of a bypass purge valve 3-2 of a multi-path parallel connection inert gas supply and conveying pipeline system through a stainless steel pipe, and the other end of each first three-way joint is connected with a first one-way valve 2-2 through a stainless steel pipe. The inlet ends of the N first one-way valves 2-2 are connected with an upstream first three-way joint 2-1 through stainless steel pipes, and the outlet ends of the N first one-way valves are connected with liquid alkali metal inlet joints of N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring 4 through stainless steel pipes.
The liquid alkali metal seeds sequentially flow to the liquid alkali metal connectors of the N pneumatic atomizing spray guns 4-1 of the first three-way connector 2-1 and the pneumatic atomizing seed injection ring 4 through the branches of the N liquid alkali metal conveying pipelines and the first one-way valve 2-2. The multi-path parallel liquid alkali metal conveying pipeline system 2 is heated by a constant-temperature electric tracing band in the whole process so as to keep the alkali metal seeds in the pipeline in a liquid state, and the heating temperature is about 20-30 ℃ higher than the melting point of the alkali metal.
As shown in fig. 6, the multiple parallel inert gas supply and delivery pipeline system 3 includes 2N-1 second three-way joints 3-1, N bypass purge valves 3-2, N inert gas switching solenoid valves 3-3, a second one-way valve 3-4, and an inert gas delivery pipeline, where N is an integer greater than 1, and in this embodiment, N is equal to 5. The inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes. The 2N-1 second three-way joints 3-1 are connected in series with one another through stainless steel pipes and are sequentially arranged from upstream to downstream according to the sequence of the serial numbers 1 to 2N-1, and the third ends of the 1 st to Nth second three-way joints 3-1 are respectively connected with inlets of the N bypass purge valves 3-2 through the stainless steel pipes. The third ends of the (N + 1) th to (2N-1) th second three-way joints 3-1 are respectively connected with inlets of the N inert gas switching electromagnetic valves 3-3 through stainless steel pipes. The first end of the 1 st second three-way joint 3-1 is connected with the outlet of the second one-way valve 3-4 through a stainless steel pipe. The second end of the 2N-1 second three-way joint 3-1 is connected with the inlet of the 1 inert gas switch electromagnetic valve 3-3 through a stainless steel pipe. The outlets of the N inert gas switch electromagnetic valves 3-3 are connected with the inert gas inlet connectors of the N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring 4 through stainless steel pipes. Outlets of the N bypass purge valves 3-2 are connected with N first three-way joints 2-1 of the multi-path parallel liquid alkali metal conveying pipeline system 2 through stainless steel pipes, and the bypass purge valves 3-2 are ball valves or electromagnetic valves driven by a motor. And the inlet of the second one-way valve 3-4 is connected with the inert gas outlet of the inert gas heating furnace 5-2 of the inert gas heating furnace system 5 through a stainless steel pipe. The whole course of the multi-path parallel inert gas supply and conveying pipeline system 3 is heated by a constant temperature electric tracing band, the heating temperature is 20-30 ℃ higher than the melting point of the alkali metal, the temperature of the inert gas in the inert gas supply and conveying pipeline is kept, and the alkali metal is not solidified and the pipeline is not blocked due to heat exchange when the inert gas is mixed with the alkali metal.
As shown in fig. 6, the pneumatic seed atomizing injection ring 4 includes N pneumatic atomizing spray guns 4-1 and an injection ring flange 4-2, where N is an integer greater than 1, and in this embodiment, N is equal to 5. The injection ring flange 4-2 is assembled and butted with the magnetofluid power generation ionization chamber and the magnetofluid power generation mixing chamber, N pneumatic atomizing spray guns 4-1 are uniformly distributed on the circumference of the injection ring flange 4-2, are vertically embedded into the circumferential side wall of the injection ring flange 4-2, penetrate through the outer side of the wall of the injection ring flange 4-2, and the front end surfaces of the N pneumatic atomizing spray guns 4-1 extend to the inner wall of the injection ring flange 4-2 to be flush. The size and specification of each pneumatic atomization spray gun 4-1 are the same.
The pneumatic atomization spray gun 4-1 is composed of a liquid alkali metal inlet joint, an atomization gas inert gas inlet joint, a pneumatic nozzle front end mixing chamber, an inner pipeline and an outer pipeline. The liquid alkali metal inlet joint is positioned right behind the nozzle of the pneumatic atomizing spray gun 4-1, and liquid alkali metal seeds flow into the mixing chamber at the front end of the pneumatic nozzle through the inner pipeline of the pneumatic atomizing spray gun. The atomized gas inert gas inlet joint is positioned at the tail end of the side wall of the pneumatic atomization spray gun 4-1, and inert gas is introduced into a mixing chamber at the front end of the pneumatic nozzle through an outer pipeline of the pneumatic atomization spray gun. The mixing chamber at the front end of the pneumatic nozzle is directly communicated with the inner pipeline and the outer pipeline of the pneumatic atomizing spray gun, the inert gas airflow in the outer pipeline flows forwards in a spiral mode, liquid alkali metal seeds in the mixing chamber at the front end of the pneumatic nozzle are smashed, dispersed and atomized under the driving of the inert gas and are uniformly mixed with the inert gas, the liquid alkali metal seeds are sprayed out from the nozzle of the mixing chamber at the front end of the pneumatic nozzle under the pushing of high pressure and are injected into the main airflow, and the liquid alkali metal seeds and the high-temperature main airflow in the injection ring are perpendicularly converged and mixed, so that the quantitative injection of the liquid alkali metal seeds is realized, and the liquid alkali metal seeds are uniformly distributed in the main airflow.
As shown in FIG. 6, the inert gas heating furnace system 5 comprises a high-pressure inert gas source 5-1, an inert gas heating furnace 5-2 and an inert gas conveying pipeline; the inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes; a high-pressure inert gas source 5-1 is connected to an inert gas inlet of an inert gas heating furnace 5-2 through an inert gas conveying pipeline, and an inert gas outlet of the inert gas heating furnace 5-2 is connected to inlets of a second one-way valve 3-4 of the multi-path parallel inert gas supply and conveying pipeline system 3; the inert gas heating furnace 5-2 is characterized in that the working temperature is 300-700 ℃, the working voltage is 220V alternating current, the heating furnace is designed into three layers, the outer layer is a stainless steel shell, the middle layer is heat-preservation asbestos and a heating coil, the inner layer is an iron cylindrical container, and the container is provided with an inert gas inlet and an inert gas outlet.
As shown in FIG. 6, a bypass purge valve 3-2, an inert gas switch solenoid valve 3-3, a stepping motor actuator 1-2 and a dedicated valve 1-5 of a programmable high-pressure stainless steel injection pump 1 of a multi-path parallel inert gas supply and delivery pipeline system 3 need to be arranged in a ferromagnetic shielding case 6. The ferromagnetic shielding cover 6 is a hexahedral iron magnetic conduction cover and has the function of preventing the leakage magnetic field of the magnetohydrodynamic generation magnet from interfering with the electric control valve and the stepping motor actuating mechanism.
The embodiment of the invention adopts a programmable high-pressure stainless steel injection pump PHD4400, the maximum thrust is 91 kg, the minimum flow is 3.06pl/min, the maximum flow is 216pl/min, and the precision is 0.35%. The liquid alkali metal seed injection flow rate set by the rated working condition is about 26mL/min to 56mL/min, and the flow rate of each spray gun is set to be 5.2mL/min to 11.2 mL/min.
Before the device works, required parameters are set on a remote controller 1-4 of the injection pump: such as injector material parameters, push-in mode, injection flow and total injection amount of alkali metal seeds; starting a heating power supply of the system for the whole-course constant-temperature electric tracing and inert gas heating furnace 5-2, setting the temperature and waiting until the temperature of each component is confirmed to reach the set temperature. And opening an outlet valve of the high-pressure inert gas source 5-1 and adjusting the output pressure to be 0.2-0.3 MPa higher than the pressure of the main gas flow. And simultaneously opening N bypass purge valves 3-2 of the multi-path parallel inert gas supply and conveying pipeline system 3, and purging the liquid metal pipeline for 5 min. And simultaneously closing N bypass purge valves 3-2 of the multi-path parallel inert gas supply and conveying pipeline system 3, and simultaneously opening N inert gas switching electromagnetic valves 3-3 to purge the inert gas pipeline, wherein N is an integer greater than 1, and is equal to or greater than 5 in the embodiment.
Opening the special valve 1-5, the high-pressure stainless steel injection pump 1 operates, the liquid alkali metal seeds are simultaneously output from the front end of the N high-pressure stainless steel injectors 1-1, pass through the special valve 1-5, the first three-way joint 2-1, the first one-way valve 2-2, the injection ring pneumatic atomization spray gun, reach the mixing chamber at the front end of the spray gun through the flow channel in the spray gun to be mixed with the inert gas, are sprayed out from the nozzle of the mixing chamber at the front end of the pneumatic nozzle, and are injected into the main gas flow in the injection ring, wherein N is an integer greater than 1, and is equal to 5 in the embodiment.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art. The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.

Claims (7)

1. The utility model provides an alkali metal seed system that multichannel parallel connection's ration flow equalizes synchronous injection which characterized in that: the alkali metal seed system comprises a programmable high-pressure stainless steel injection pump (1), a multi-path parallel liquid alkali metal conveying pipeline system (2), a multi-path parallel inert gas supply and conveying pipeline system (3), a pneumatic atomization seed injection ring (4) and an inert gas heating furnace system (5), wherein the output port of the programmable high-pressure stainless steel injection pump (1), the input port and the output port of the multi-path parallel liquid alkali metal conveying pipeline system (2), the input port and the output port of the multi-path parallel inert gas supply and conveying pipeline system (3), the bypass purging port and the pneumatic atomization spray guns of the pneumatic atomization seed injection ring (4) are the same in quantity; the inert gas heating furnace system (5) comprises a high-pressure inert gas source (5-1) and an inert gas heating furnace (5-2); the inert gas is conveyed from a high-pressure inert gas source (5-1) to an inert gas heating furnace (5-2) for heating, and then conveyed to a plurality of paths of parallel inert gas supply and conveying pipeline systems (3) for shunting; liquid alkali metal seeds are simultaneously pushed and output from needle cylinders of N high-pressure stainless steel injectors (1-1) of a programmable high-pressure stainless steel injection pump (1), N is an integer larger than 1, the liquid alkali metal seeds enter N pneumatic atomizing spray guns (4-1) of a pneumatic atomizing seed injection ring (4) through N parallel branches of a corresponding multi-path parallel liquid alkali metal conveying pipeline system (2) and reach a spray gun end mixing chamber, the liquid alkali metal seeds are mixed with inert gas which is input into the spray gun end mixing chamber from the multi-path parallel inert gas supply and conveying pipeline system (3) and rotates, the liquid alkali metal seeds are pneumatically atomized and are sprayed out from a nozzle of the spray gun end mixing chamber, the spraying direction is intersected with the main gas flow in the injection ring at an angle of 90 degrees, and the liquid alkali metal seeds are injected into the pneumatic atomizing seed injection ring (4); the N pneumatic atomizing spray guns (4-1) correspond to N liquid alkali metal conveying pipelines, N inert gas conveying pipelines and N bypass purging branches, N is an integer larger than 1, each pneumatic atomizing spray gun (4-1) is provided with and only corresponds to only 1 liquid alkali metal conveying pipeline, 1 inert gas supply and conveying pipeline and 1 bypass purging branch, and the liquid alkali metal seed flow of each liquid alkali metal conveying pipeline is the same.
2. The alkali metal seed system of claim 1, wherein: the programmable high-pressure stainless steel injection pump (1) comprises N high-pressure stainless steel injectors (1-1) with constant-temperature electric tracing bands, stepping motor execution mechanisms (1-2), control transmission lines, a programmable controller and N injector special valves (1-5), wherein N is an integer larger than 1, needle cylinders of the N high-pressure stainless steel injectors (1-1) are fixed on the unique stepping motor execution mechanisms (1-2), the stepping motor execution mechanisms (1-2) simultaneously push the N high-pressure stainless steel injectors (1-1) to output liquid alkali metal seeds, the liquid alkali metal seeds flow into N liquid alkali metal conveying pipelines connected in parallel through the N injector special valves (1-5), the stepping motor actuating mechanism (1-2) is connected with the programmable controller through a control transmission line; the front end of the high-pressure stainless steel injector (1-1) is a syringe head, and the rear end of the high-pressure stainless steel injector is a piston handle; the injector special valve (1-5) is arranged at the front end of the head of the needle cylinder of the high-pressure stainless steel injector (1-1) and is a ball valve or an electromagnetic valve driven by a motor; the shell of the needle cylinder of the high-pressure stainless steel injector (1-1) is attached with a constant-temperature electric tracing band.
3. The alkali metal seed system of claim 1, wherein: the multi-path parallel liquid alkali metal conveying pipeline system (2) comprises N first three-way joints (2-1), N first one-way valves (2-2) and a liquid alkali metal conveying pipeline, wherein N is an integer greater than 1; the liquid alkali metal conveying pipeline comprises a plurality of sections of stainless steel pipes, the lengths of all branches of the N liquid alkali metal conveying pipelines are the same, and the internal and external cross-sectional areas of the pipelines are the same; one end of each of the N first three-way joints (2-1) is connected with a special distribution valve (1-5) of an injector of a programmable high-pressure stainless steel injection pump through a stainless steel pipe, one end of each first three-way joint is connected with an outlet of a bypass purge valve (3-2) of a multi-path parallel inert gas supply and conveying pipeline system through the stainless steel pipe, and the other end of each first three-way joint is connected with a first one-way valve (2-2) through the stainless steel pipe; the inlet ends of the N first one-way valves (2-2) are connected with an upstream first three-way joint (2-1) through stainless steel pipes, and the outlet ends of the N first one-way valves are connected with liquid alkali metal inlet joints of N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring through stainless steel pipes; the liquid alkali metal seeds sequentially flow to a first three-way joint (2-1) and a first one-way valve (2-2) through branches of N liquid alkali metal conveying pipelines (2) and flow into liquid alkali metal joints of N pneumatic atomizing spray guns (4-1) of a pneumatic atomizing seed injection ring (4); the multi-path parallel liquid alkali metal conveying pipeline system (2) is heated by a constant-temperature electric tracing band in the whole process so as to keep the alkali metal seeds in the pipeline in a liquid state, and the heating temperature is 20-30 ℃ higher than the melting point of the alkali metal.
4. The alkali metal seed system of claim 1, wherein: the multi-path parallel inert gas supply and conveying pipeline system (3) comprises 2N-1 second three-way joints (3-1), N bypass purging valves (3-2), N inert gas switching electromagnetic valves (3-3), a second one-way valve (3-4) and an inert gas conveying pipeline, wherein N is an integer greater than 1; the inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes, the lengths of all branches of the inert gas conveying pipeline are the same, and the internal and external cross-sectional areas of the pipeline are the same; the 2N-1 second three-way joints (3-1) are connected in series with each other through stainless steel pipes and are sequentially arranged from upstream to downstream according to the sequence of the serial numbers from 1 to 2N-1, and the third ends of the 1 st to Nth second three-way joints (3-1) are respectively connected with inlets of the N bypass purge valves (3-2) through the stainless steel pipes; the third ends of the (N + 1) th to (2N-1) th second three-way joints (3-1) are respectively connected with inlets of the N inert gas switching electromagnetic valves (3-3) through stainless steel pipes; the first end of the 1 st second three-way joint (3-1) is connected with the outlet of the second one-way valve (3-4) through a stainless steel pipe; the second end of the 2N-1 second three-way joint (3-1) is connected with the inlet of the 1 inert gas switching electromagnetic valve (3-3) through a stainless steel pipe; outlets of the N inert gas switching electromagnetic valves (3-3) are connected with inert gas inlet connectors of N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring (4) through stainless steel pipes; outlets of the N bypass purge valves (3-2) are connected with N first three-way joints (2-1) of the multi-path parallel liquid alkali metal conveying pipeline system (2) through stainless steel pipes, and the bypass purge valves (3-2) are ball valves or electromagnetic valves driven by a motor; the inlet of the second one-way valve (3-4) is connected with the inert gas outlet of the inert gas heating furnace (5-2) of the inert gas heating furnace system (5) through a stainless steel pipe; the whole course of the multi-path parallel inert gas supply and conveying pipeline system (3) is heated by a constant temperature electric tracing band, the heating temperature is 20-30 ℃ higher than the melting point of the alkali metal, the temperature of the inert gas in the inert gas supply and conveying pipeline is kept, and the alkali metal is not solidified and the pipeline is not blocked due to heat exchange when the inert gas is mixed with the alkali metal.
5. The alkali metal seed system of claim 1, wherein: the pneumatic atomization seed injection ring (4) comprises N pneumatic atomization spray guns (4-1) and an injection ring flange (4-2), wherein N is an integer larger than 1, the N pneumatic atomization spray guns (4-1) with the same size and specification are uniformly distributed on the circumference of the injection ring flange (4-2), the N pneumatic atomization spray guns penetrate through the outer wall of the injection ring flange (4-2) along the radial direction, and the front end face of each pneumatic atomization spray gun (4-1) is flush with the inner wall of the injection ring flange (4-2) or slightly retracts into the inner wall by 1-2 mm; n is an integer greater than 1; the pneumatic atomization seed injection ring (4) is provided with a sensor for monitoring temperature, and the pneumatic atomization seed injection ring (4) is heated by high-temperature main air flow flowing through the pneumatic atomization seed injection ring.
6. The alkali metal seed system of claim 1, wherein: the inert gas heating furnace system (5) comprises a high-pressure inert gas source (5-1), an inert gas heating furnace (5-2) and an inert gas conveying pipeline; the inert gas conveying pipeline comprises a plurality of sections of stainless steel pipes; a high-pressure inert gas source (5-1) is connected to an inert gas inlet of the inert gas heating furnace (5-2) through a section of inert gas conveying pipeline, and an inert gas outlet of the inert gas heating furnace (5-2) is connected to inlets of a second one-way valve (3-4) of the multi-channel parallel inert gas supply and conveying pipeline system (3); the inert gas heating furnace (5-2) has the working temperature of 300-700 ℃, the working voltage of 220V alternating current, the heating furnace is designed into three layers, the outer layer is a stainless steel shell, the middle layer is heat-preservation asbestos and a heating coil, the inner layer is an iron cylindrical container, and the container is provided with an inert gas inlet and an inert gas outlet.
7. The alkali metal seed system of claim 1, wherein: alkali metal seed system still include ferromagnetic shield cover, ferromagnetic shield cover (6) be hexahedral iron magnetic conduction cover, have the effect that prevents magnetic current body electricity generation magnet magnetic leakage field interference electric control valve and step motor actuating mechanism, parallelly connected inert gas of multichannel supplies with N bypass purge valve (3-2) of pipeline system (3), N inert gas switch solenoid valve (3-3), step motor actuating mechanism (1-2) and N of programmable high pressure stainless steel injection pump (1) are special to join in marriage valve (1-5) and need place in ferromagnetic shield cover (6).
CN202210833781.7A 2022-07-15 2022-07-15 Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system Pending CN114977723A (en)

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CN202210833781.7A CN114977723A (en) 2022-07-15 2022-07-15 Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system

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Application Number Priority Date Filing Date Title
CN202210833781.7A CN114977723A (en) 2022-07-15 2022-07-15 Multi-path parallel quantitative flow equalizing synchronous injection alkali metal seed system

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CN114977723A true CN114977723A (en) 2022-08-30

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