A multi-channel parallel quantitative equal-current synchronous injection alkali metal seed system

Abstract

A multi-channel, parallel, quantitative, equal-flow, and synchronous injection system for alkali metal seeds comprises a programmable high-pressure injection pump, a multi-channel, parallel liquid alkali metal delivery pipeline system, a multi-channel, parallel inert gas supply and delivery pipeline system, a pneumatic atomization seed injection ring, an inert gas heating furnace system, and a ferromagnetic shield. The programmable high-pressure injection pump actuator simultaneously and quantitatively pushes liquid alkali metal seeds from N high-pressure stainless steel syringes according to a set program. The liquid alkali metal seeds then enter N corresponding pneumatic atomization spray guns of the pneumatic atomization seed injection ring through N corresponding liquid alkali metal delivery pipelines and directly into the mixing chamber at the end of the spray guns. There, the liquid seeds are mixed with inert gas fed into the mixing chamber at the end of the pneumatic atomization spray guns through N inert gas supply and delivery pipelines, atomized, and injected into the injection ring. This invention enables on-demand, quantitative, equal-flow, and synchronous multi-channel injection of alkali metal seeds, thereby achieving uniform mixing and sufficient ionization of the alkali metal seeds with the main airflow.

Description

Technical Field

[0001] 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 Art

[0002] Magnetohydrodynamic power generation (MHD) is a novel power generation method that directly converts thermal energy into electrical energy. Its basic operating principle is Faraday's law of electromagnetic induction. Depending on the conductive fluid used, MHD power generation can be categorized as combustion gas plasma MHD power generation, inert gas plasma power generation, and liquid metal MHD power generation. When utilizing nuclear energy as a heat source, inert gas plasma power generation fully utilizes the high heat generated by nuclear energy. This increases the total temperature and pressure of the inert gas, creating a pressure differential across the MHD power generation channel and, in turn, a flow field. The inert gas plasma rapidly flows through the power generation channel, cutting through the perpendicular magnetic field lines. This generates an induced electromotive force between the electrodes on either side of the channel, generating electricity under an applied load.

[0003] During inert gas plasma power generation, a certain amount of alkali metals must be added to the inert gas as ionization seeds to enhance the conductivity of the plasma and significantly improve the performance of magnetohydrodynamic power generation. The mole fraction of the alkali metal in the total gas mixture is called the seed fraction. For nuclear-powered disk magnetohydrodynamic generators, the optimal seed fraction to achieve high conductivity and stable non-equilibrium ionization is generally between a few thousandths and a few ten-thousandths. To ensure that the main gas flow fluid operates within the optimal seed fraction operating range, the seed fraction of the main gas flow fluid must be strictly controlled. In actual experimental research equipment, the flow rate of the alkali metal can be as low as a few milligrams per minute. Therefore, quantitative microstream injection of alkali metal seeds is a major challenge. Furthermore, to quickly and fully ionize the alkali metal seeds in the inert gas mixture and obtain a uniform and stable main plasma gas flow working medium, the alkali metal seed crystals must be spatially uniformly mixed with the main gas flow. The method of injecting the alkali metal seeds is a key issue.

[0004] Existing alkali metal injection methods are mostly carried out by carrier gas to carry out alkali metal vapor or by carrier gas to carry alkali metal droplets, such as Figure 1 The seed injection system used in the Tokyo University of Technology's disk generator test, as shown, and Figure 2The alkali metal seed injection device disclosed in Chinese patent ZL201910947699.5 uses a furnace to heat liquid alkali metal to produce alkali metal vapor. A carrier gas is then introduced to carry the alkali metal vapor, forming a mixture of the carrier gas and the alkali metal vapor. The mixture is then injected into the main gas stream through a water-cooled cylinder and nozzle. This mixture of carrier gas and alkali metal vapor passes through an elongated delivery pipe and a water-cooled main gas stream cylinder. During this process, the alkali metal vapor condenses into a liquid. Due to the compressibility of the gas, its flow rate is inevitably affected by fluctuations in the main gas stream pressure. The amount of alkali metal vapor carried in the mixture is related to the pressure and vaporization process of the carrier gas. The flow rate of the mixed gas injected into the main gas stream is related to the injection pressure and the main gas stream pressure. Due to these pressure fluctuations, the actual injection flow rate is difficult to control and determine, severely affecting the ionization of the seed and resulting in low conductivity of the power generation medium, which in turn affects the power output of the generator and experimental research.

[0005] Figure 3 The pure alkali metal seed injection system for an inert gas plasma magnetohydrodynamic generator (MHDG) shown in Chinese patent ZL20150572329.X mentions the use of a syringe to output a fixed amount of alkali metal. However, its injection system uses a mixer to mix a carrier gas with the liquid alkali metal delivered by the syringe, bringing out droplets of alkali metal. The carrier gas and the alkali metal droplets pass through a slender pipe. To avoid the influence of the strong magnetic field of the MHDG, the pipe length generally needs to exceed 1.5 meters. The pipe then passes through a water-cooled main air flow cylinder. This two-phase flow is also inevitably separated into gas and liquid in the delivery pipe, presenting a state of liquid and gas. Moreover, due to the compressibility of the gas, when the main air flow pressure fluctuates, the seed flow rate also fluctuates. In fact, the seed injection flow rate fluctuates and is not equal to the flow rate quantitatively introduced by the syringe.

[0006] Figure 4The Chinese patent publication number CN113346708A solves the problem of stabilizing the total flow rate of seed injection in the system. However, since the injection system uses a one-way N-type adapter, it cannot guarantee that the alkali metal seed flow rates in each branch pipe are equal after the adapter. Moreover, since the pneumatic atomizing spray guns on the pneumatic atomizing seed injection ring are at different heights, the pressure difference caused by gravity causes the alkali metal seed flow rates distributed to each pneumatic atomizing spray gun to be unequal. There is even no seed output from some pneumatic atomizing spray guns at higher positions in the pneumatic atomizing seed injection ring, resulting in a cut-off of the alkali metal seed flow. Moreover, since the branch pipe lengths corresponding to the spray guns at different heights are different, as well as the differences in the spray gun structure, it cannot be guaranteed that the seeds in each pneumatic atomizing spray gun are ejected simultaneously. It is also impossible to ensure that the alkali metal seeds are spatially uniformly distributed when mixing with the main airflow. The spatial distribution of the alkali metal seed fraction is uneven and cannot meet the optimal seed fraction condition. The high conductivity of the inert gas plasma cannot be met in space, and the generator performance is greatly reduced. And because there is only one liquid metal seed pipeline and one inert gas supply and delivery pipeline, if the pipeline is blocked or the corresponding valve fails, the entire system cannot continue to operate. This is a defect of the system described in the patent.

[0007] To sum up, in the above-mentioned prior art, the total flow rate of the alkali metal seeds injected into the main airflow is inaccurate and unstable, or the flow rate of each injection branch of the alkali metal seeds is inaccurate and unstable, or the injection branches of the alkali metal seeds cannot be injected synchronously, and it is impossible to achieve true alkali metal micro-flow precise quantitative synchronous delivery and spatially uniform mixing. Summary of the Invention

[0008] In order to solve the problems of the above-mentioned prior art, the present invention proposes a multi-channel parallel quantitative equal flow synchronous injection alkali metal seed system. The present 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 airflow through a full multi-channel parallel liquid alkali metal delivery pipeline system and a pneumatic atomization seed injection ring. The liquid alkali metal seeds remain in liquid form throughout the entire process from the output of the injection pump to the mixing chamber at the front end of the nozzle injected into the main airflow. Due to the quantitative output characteristics of the injection pump and the incompressible characteristics of the liquid, the flow rate of the liquid alkali metal seeds injected into the main airflow is not affected by the pressure fluctuations of the main airflow, and the flow rate of the liquid alkali metal seeds can be accurately pushed to achieve trace quantitative injection. Since the lengths of the branches of the liquid alkali metal delivery pipeline are the same, the inner and outer cross-sectional areas of the pipelines are the same, and the inner and outer cross-sectional areas of the inert gas supply and delivery pipelines are the same, under the premise that the seed flow rates of the branches of the liquid alkali metal delivery pipeline are the same, the flow time of the liquid alkali metal seeds in the pipeline is the same, and the delivery of the liquid alkali metal seeds is synchronized. The system adopts a multi-channel parallel mode, each syringe corresponds to a spray gun, the flow rate of each spray gun is the same and there is no interruption problem. The seed fraction of the main air flow gas mixture remains uniform and stable in space, meeting the precise requirements of the non-equilibrium ionization conditions of the disk magnetohydrodynamic generator on seed quantity and seed spatial distribution.

[0009] To achieve the above objectives, the present invention adopts the following technical means:

[0010] A multi-channel parallel quantitative equal flow synchronous injection alkali metal seed system, the alkali metal seed system comprising a programmable high-pressure stainless steel injection pump (1), a multi-channel parallel liquid alkali metal delivery pipeline system (2), a multi-channel parallel inert gas supply and delivery pipeline system (3), a pneumatic atomization seed injection ring (4) and an inert gas heating furnace system (5), the output port of the programmable high-pressure stainless steel injection pump (1), the input port and output port of the multi-channel parallel liquid alkali metal delivery pipeline system (2), the multi-channel parallel inert gas supply and delivery pipeline system (3), a pneumatic atomization seed injection ring (4) and an inert gas heating furnace system (5), The input port and output port of the liquid supply and delivery pipeline system (3), the bypass purge port, and the number of pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring (4) are all the same; the inert gas heating furnace system (5) includes a high-pressure inert gas source (5-1) and an inert gas heating furnace (5-2); the inert gas is transported from the high-pressure inert gas source (5-1) to the inert gas heating furnace (5-2) for heating, and then transported to the multi-path parallel inert gas supply and delivery pipeline system (3) for diversion; the liquid alkali metal seeds are simultaneously discharged from the programmable high-pressure inert gas source (5-1) to the inert gas heating furnace (5-2) for diversion; The N high-pressure stainless steel syringes (1-1) of the stainless steel injection pump (1) push out the liquid, where N is an integer greater than 1, and enter the N pneumatic atomizing spray guns (4-1) of the pneumatic atomizing seed injection ring (4) through the N parallel branches of the corresponding multi-way parallel liquid alkali metal delivery pipeline system (2), and directly reach the mixing chamber at the end of the spray gun, where they are mixed with the rotating inert gas input into the mixing chamber at the end of the spray gun from the multi-way parallel inert gas supply and delivery pipeline system (3). The liquid alkali metal seeds are pneumatically atomized and sprayed from the nozzle of the mixing chamber at the end of the spray gun. The liquid alkali metal is injected into the pneumatic atomizing seed injection ring (4) with the injection direction intersecting the main airflow in the injection ring at a 90-degree angle; the liquid alkali metal is injected into the pneumatic atomizing seed injection ring (4); the N pneumatic atomizing spray guns (4-1) correspond to N liquid alkali metal delivery pipelines, N inert gas delivery pipelines and N bypass purge branches, N is an integer greater than 1, and each pneumatic atomizing spray gun (4-1) has and only corresponds to one liquid alkali metal delivery pipeline, one inert gas supply and delivery pipeline and one bypass purge branch, and the liquid alkali metal seed flow rate of each liquid alkali metal delivery pipeline is the same.

[0011] The alkali metal seed system of the present invention comprises a programmable high-pressure stainless steel injection pump, a multi-channel parallel liquid alkali metal delivery pipeline system, a multi-channel parallel inert gas supply and delivery pipeline system, a pneumatic atomization seed injection ring, an inert gas heating furnace system and a ferromagnetic shielding cover.

[0012] The programmable high-pressure stainless steel injection pump is connected to a multi-way parallel liquid alkali metal delivery pipeline system, and the programmable high-pressure stainless steel injection pump has the function of storing and quantitatively delivering liquid alkali metal seeds. The two ends of the multi-way parallel liquid alkali metal delivery pipeline system are respectively connected to the programmable high-pressure stainless steel injection pump and the pneumatic atomization seed injection ring, and the multi-way parallel liquid alkali metal delivery pipeline system has the function of transporting liquid alkali metal seeds. One end of the multi-way parallel inert gas supply and delivery pipeline system is connected to the multi-way parallel liquid alkali metal delivery pipeline system, and the other end is connected to the pneumatic atomization seed injection ring, and the multi-way parallel inert gas supply and delivery pipeline system has the function of supplying and transporting inert gas carrier gas. The pneumatic atomization seed injection ring is respectively connected to a multi-way parallel liquid alkali metal delivery pipeline system and a multi-way parallel inert gas supply and delivery pipeline system, and is located at the end of the overall alkali metal seed system. The liquid alkali metal seeds are mixed and atomized with the inert gas carrier gas, and the atomized mixture is sprayed into the main airflow, intersecting and mixing with the high-temperature main airflow at right angles, so that the alkali metal seeds are evenly distributed in the main airflow.

[0013] The programmable high-pressure stainless steel syringe pump includes N high-pressure stainless steel syringes, a stepper motor actuator, a control transmission line, a remote controller, and N syringe-specific valves, where N is an integer greater than 1. The N high-pressure stainless steel syringes are fixed to the stepper motor actuator; the stepper motor actuator is connected to the remote controller via the control transmission line. The front end of the high-pressure stainless steel syringe is the syringe head, and the rear end of the high-pressure stainless steel syringe is the piston handle. N syringe-specific valves are installed at the front end of the syringe heads of the N high-pressure stainless steel syringes, and each high-pressure stainless steel syringe is equipped with a syringe-specific valve. The syringe-specific valve is a ball valve or solenoid valve driven by a motor. The syringe barrel housing of the high-pressure stainless steel syringe is heated by a constant temperature electric heating tape, and the heating temperature is 20°C to 30°C higher than the melting point of the alkali metal.

[0014] The stepper motor actuator is connected to the remote controller via an RS485 port via a control transmission line, and transmits the program instructions preset by the remote controller to the stepper motor actuator. The stepper motor actuator pushes the piston handles of N high-pressure stainless steel syringes forward at the same time, pushing the liquid alkali metal seeds in the syringes of the N high-pressure stainless steel syringes into the multi-parallel liquid alkali metal delivery pipeline system at a uniform speed and in a quantitative manner, where N is an integer greater than 1.

[0015] The multi-way parallel liquid alkali metal delivery pipeline system includes N first three-way connectors, N one-way valves, and liquid alkali metal delivery pipelines, where N is an integer greater than 1. The liquid alkali metal delivery pipelines comprise several sections of stainless steel tubing. Each of the N first three-way connectors is connected at one end to a syringe-specific valve via stainless steel tubing, at one end to the outlet of a bypass purge valve in the multi-way parallel inert gas supply and delivery pipeline system via stainless steel tubing, and at the other end to a first one-way valve via stainless steel tubing. The inlet ends of the N first one-way valves are connected to the upstream first three-way connector via stainless steel tubing, and the outlet ends are connected via stainless steel tubing to the liquid alkali metal inlet connectors of N pneumatic atomizing spray guns in a pneumatic atomizing seed injection ring. The multi-way parallel liquid alkali metal delivery pipeline system is heated throughout by a constant-temperature electric heating cable, at a temperature approximately 20°C to 30°C above the melting point of the alkali metal to maintain the alkali metal in the pipelines in a liquid state. The lengths of the branches of the liquid alkali metal conveying pipeline are the same, and the inner and outer cross-sectional areas of the pipeline are the same.

[0016] The multi-way parallel inert gas supply and delivery pipeline system includes 2N-1 second three-way connectors, N bypass purge valves, N inert gas on / off solenoid valves, a second one-way valve, and an inert gas delivery pipeline, where N is an integer greater than 1. The inert gas delivery pipeline comprises several sections of stainless steel pipe. The 2N-1 second three-way connectors are connected in series via stainless steel pipes and are arranged in order from upstream to downstream, numbered 1 to 2N-1. The third ends of the first through Nth second three-way connectors are connected to the inlets of the N bypass purge valves via stainless steel pipes. The third ends of the N+1 through 2N-1th second three-way connectors are connected to the inlets of the N inert gas on / off solenoid valves via stainless steel pipes. The first end of the first second three-way connector is connected to the outlet of the second one-way valve via stainless steel pipe. The inlet of the second one-way valve is connected to the inert gas outlet of the inert gas heating furnace. The second end of the 2N-1th second three-way connector is connected to the inlet of an inert gas on / off solenoid valve via stainless steel pipes. The outlets of the N inert gas switch solenoid valves are connected to the inert gas inlet connectors of the N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring via stainless steel pipes. The outlets of the N bypass purge valves are connected to the N first three-way connectors of the multi-way parallel liquid alkali metal delivery pipeline system via stainless steel pipes. The bypass purge valve is a ball valve or solenoid valve driven by a motor. The multi-way parallel inert gas supply and delivery pipeline system is heated throughout by a constant temperature electric heating tape. The heating temperature is 20°C to 30°C higher than the melting point of the alkali metal, maintaining the inert gas temperature in the inert gas supply and delivery pipelines. When mixed with the alkali metal, the alkali metal will not solidify due to heat exchange and block the pipeline. The inner and outer cross-sectional areas of the inert gas supply and delivery pipelines are the same.

[0017] The pneumatic atomization seed injection ring comprises N pneumatic atomization lances and an injection ring flange. N is an integer greater than 1. The N pneumatic atomization lances of identical dimensions are evenly distributed around the circumference of the injection ring flange, radially penetrating the outer wall of the injection ring flange. The front ends of the pneumatic atomization lances are flush with the inner wall of the injection ring flange or slightly recessed by 1-2 mm. The pneumatic atomization seed injection ring is equipped with a temperature sensor. The pneumatic atomization seed injection ring is heated by the high-temperature primary airflow flowing through the injection ring to ensure that the lance temperature operates above the melting point of the alkali metal seeds, maintaining the alkali metal seeds within the lances in a liquid state.

[0018] The pneumatic atomizing spray gun consists of a liquid alkali metal inlet connector, an atomizing gas inlet connector, a mixing chamber at the front end of the pneumatic nozzle, internal piping, and external piping. The liquid alkali metal inlet connector is located directly behind the pneumatic atomizing spray gun nozzle, while the atomizing gas inlet connector is located near the rear end of the pneumatic atomizing spray gun. Liquid alkali metal is introduced into the mixing chamber at the front end of the pneumatic atomizing spray gun through the internal piping, while inert gas is introduced into the mixing chamber at the front end of the pneumatic atomizing spray gun through the external piping.

[0019] The pneumatic nozzle front end mixing chamber is directly connected to the inner and outer pipelines of the pneumatic atomizing spray gun, respectively. The inert gas in the outer pipeline flows in a forward spiral. The liquid alkali metal in the pneumatic nozzle front end mixing chamber is broken up, dispersed and atomized by the inert gas, uniformly mixed with the inert gas, and ejected from the nozzle of the pneumatic nozzle front end mixing chamber under high pressure into the main airflow, intersecting and mixing with the high-temperature main airflow at right angles, so that the alkali metal seeds are evenly distributed in the main airflow. Because the multi-channel parallel liquid alkali metal delivery pipeline system is filled with incompressible alkali metal liquid throughout the entire process, the alkali metal liquid is output from the syringe, passes through the pipeline and valve, and remains liquid throughout the entire process until it reaches the mixing chamber at the front end of the pneumatic atomizing spray gun. Therefore, the alkali metal flow rate delivered is stable. As long as the pushing force does not exceed the maximum thrust of the high-pressure stainless steel syringe pump, the syringe pump output flow rate is constant according to the programmed output, regardless of the main airflow pressure fluctuation. The actual injected seed flow rate is the same as the seed flow rate pushed by the syringe pump, thus achieving quantitative and temporally uniform alkali metal seed injection.

[0020] The inert gas heating furnace system includes a high-pressure inert gas source, an inert gas heating furnace, and an inert gas delivery pipeline. The inert gas delivery pipeline comprises several sections of stainless steel pipe. The high-pressure inert gas source is connected to the inert gas inlet of the inert gas heating furnace via a section of inert gas delivery pipeline. The inert gas outlet of the inert gas heating furnace is connected to the second one-way valve inlet of the multi-way parallel inert gas supply and delivery pipeline system. The inert gas heating furnace has an operating temperature of 300 to 700 degrees Celsius and an operating voltage of 220V AC. The heating furnace has a three-layer design, with an outer stainless steel shell, a middle layer of insulating asbestos and heating coils, and an inner iron cylindrical container with an inert gas inlet and an inert gas outlet. The inert gas heating furnace can preheat the inert gas in the furnace before the alkali metal seed system is put into operation, and keep the inert gas flow temperature high during the long-term operation of the system, so as to avoid the liquid alkali metal seeds from cooling and solidifying and clogging the spray gun when the inert gas and liquid alkali metal seeds are mixed in the mixing chamber of the pneumatic atomizing spray gun, and ensure a certain spray gun outlet temperature, which is conducive to the ionization of the alkali metal seeds.

[0021] The bypass purge valves, inert gas on / off solenoid valves, programmable high-pressure stainless steel syringe pump actuators, and specialized valves in the multi-way parallel inert gas supply and delivery pipeline system must be placed in a ferromagnetic shield. This hexahedral, iron-based magnetic shield prevents magnetic field leakage from the magnetohydrodynamic electromagnets from interfering with the electronically controlled valves and stepper motor actuators.

[0022] The alkali metal seed is cesium, potassium, rubidium, etc. The inert gas carrier gas is argon or helium, etc.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention adopts a programmable high-pressure stainless steel injection pump to push liquid alkali metal seeds at a constant speed and in a constant quantity. The seed pushing flow rate of the high-pressure stainless steel syringe can be set in advance in the controller. The flow rate can be given as a fixed value or as a function that changes with time. In one test, the influence of various seed quantities on the performance of the generator can be debugged to determine the optimal seed quantity.

[0025] The alkali metal seed delivery system of the present invention uses constant-temperature electric heating, with the heating temperature being 20°C to 30°C higher than the melting point of the alkali metal, to ensure that the alkali metal seeds remain in a liquid state throughout the entire delivery process from the high-pressure stainless steel syringe to the front nozzle of the pneumatic atomizing spray gun. Due to the incompressible nature of the liquid, the flow rate of the liquid alkali metal seeds injected into the main airflow is not affected by fluctuations in the pressure of the main airflow. This seed injection method, which combines liquid delivery conditions throughout the entire process with the quantitative output performance of a programmable high-pressure stainless steel injection pump, ensures a stable flow rate of liquid alkali metal seed injection, stabilizes the seed fraction of the generator's main airflow working fluid at a preset value, and meets the requirements of the disc-type magnetohydrodynamic generator, which is very sensitive to non-equilibrium ionization conditions and seed quantity.

[0026] The present invention adopts a seed injection method of using multiple pneumatic atomizing spray guns to evenly distribute multiple points of injection injection around the circumference of the injection ring. The injection direction intersects the main airflow at right angles, and a syringe pump drives multiple syringes to inject seeds at the same time, which can achieve uniform mixing of seeds and the main airflow and uniform and stable distribution of seeds in space.

[0027] The present invention employs a multi-channel parallel connection of pipelines, with N high-pressure stainless steel syringe barrels fixed to a single stepper motor actuator, where N is an integer greater than 1. Furthermore, each high-pressure stainless steel syringe barrel, pneumatic atomizing spray gun, liquid alkali metal delivery pipeline, inert gas supply and delivery pipeline, and bypass purge branch are assembled in a one-to-one correspondence. This ensures that the flow rates of liquid alkali metal seeds in each liquid alkali metal delivery pipeline and each pneumatic atomizing spray gun are the same, achieving spatially uniform and stable seed fractions in the main gas flow mixture, thus meeting the precise seed quantity and spatial distribution requirements of the disk-type magnetohydrodynamic generator under non-equilibrium ionization conditions. Because the pipelines are connected in parallel, if a branch is blocked or a valve malfunctions, the other branches are unaffected, and the system can continue to operate normally.

[0028] The present invention innovatively utilizes an inert gas heating furnace with an operating temperature of 300 to 700 degrees Celsius and an operating voltage of 220V AC. The furnace features a three-layer design, with an outer stainless steel shell, a middle layer of insulating asbestos and heating coils, and an inner iron cylindrical container. This inert gas heating furnace preheats the inert gas within the alkali metal seed system before operation, maintaining a high inert gas flow temperature during extended system operation. This prevents the liquid alkali metal seeds from cooling and solidifying in the mixing chamber of the pneumatic atomizing spray gun, potentially clogging the spray gun. Furthermore, the system maintains a constant spray gun outlet temperature, which is beneficial for ionization of the alkali metal seeds.

[0029] The present invention stipulates that the lengths of the branches of the liquid alkali metal delivery pipeline are the same, the inner and outer cross-sectional areas of the pipeline are the same, and the inner and outer cross-sectional areas of the inert gas supply and delivery pipeline are the same. Under the premise that the seed flow rates of the branches of the liquid alkali metal delivery pipeline are the same, the flow time of the liquid alkali metal seeds in the pipeline is the same, the liquid alkali metal seeds are delivered synchronously, stable and uniform mixing of the seeds with the main airflow is achieved, and uniform and stable spatial distribution of the seeds is achieved in a short time. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the seed injection system for the Toko University disk generator test in Japan;

[0031] Figure 2 Schematic diagram of the alkali metal seed injection device in patent ZL201910947699.5;

[0032] Figure 3 Patent ZL20150572329.X: Structural diagram of the pure alkali metal seed injection system for the inert gas plasma magnetohydrodynamic generator;

[0033] Figure 4 Publication No. CN113346708A schematic diagram of the structure of the alkali metal seed quantitative uniform flow injection system;

[0034] Figure 5 This is a structural block diagram of the alkali metal seed system with multiple parallel quantitative equal-current synchronous injection according to the present invention;

[0035] Figure 6 FIG1 is a schematic diagram showing a specific embodiment of the present invention, i.e., a system for quantitatively equalizing and synchronously injecting alkali metal seeds in multiple parallel channels;

[0036] Figure 5 、 Figure 6 Chinese: 1 Programmable high-pressure stainless steel syringe pump: 1-1 High-pressure stainless steel syringe, 1-2 Stepper motor actuator, 1-3 RS485 remote control line, 1-4 Remote controller, 1-5 Special valve, 2 Multi-way parallel liquid alkali metal delivery pipeline system: 2-1 First three-way connector, 2-2 First one-way valve, 3 Multi-way parallel inert gas supply and delivery pipeline system: 3-1 Second three-way connector, 3-2 Bypass purge valve, 3-3 Inert gas switch solenoid valve, 3-4 Second one-way valve, 4 Pneumatic atomization seed injection ring: 4-1 Pneumatic atomization 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, 6 Ferromagnetic shielding cover. DETAILED DESCRIPTION

[0037] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 5 As shown, the alkali metal seed quantitative injection system of the present invention includes a programmable high-pressure stainless steel injection pump 1, a multi-way parallel liquid alkali metal delivery pipeline system 2, a multi-way parallel inert gas supply and delivery pipeline system 3, a pneumatic atomization seed injection ring 4, an inert gas heating furnace system 5, and a ferromagnetic shielding cover 6.

[0039] like Figure 6As shown, the programmable high-pressure stainless steel syringe pump 1 includes N high-pressure stainless steel syringes 1-1, a stepper 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, in this embodiment, is 5. The N high-pressure stainless steel syringes 1-1 are fixed to the stepper motor actuator 1-2; the stepper motor actuator 1-2 is connected to the remote controller 1-4 via the RS485 remote control line 1-3. The front end of the high-pressure stainless steel syringe 1-1 is the syringe head, and the rear end of the high-pressure stainless steel syringe is the piston handle. N dedicated valves 1-5 are installed at the front end of the syringe heads of the N high-pressure stainless steel syringes 1-1, with each high-pressure stainless steel syringe 1-1 equipped with a dedicated valve 1-5. The dedicated valves 1-5 are motor-driven ball valves or solenoid valves. The syringe housing of the high-pressure stainless steel syringe 1-1 is in close contact with the constant temperature electric heating cable. The stepper motor actuator 1-2 is connected to the remote controller 1-4 via an RS485 port and an RS485 remote control line 1-3. Program instructions pre-set in the remote controller 1-4 are transmitted to the stepper motor actuator 1-2 via the RS485 remote control line 1-3. The stepper motor actuator 1-2 simultaneously pushes the piston handles of N high-pressure stainless steel syringes 1-1 forward, pushing the liquid alkali metal in the syringe barrels at a constant speed and in a fixed amount into the multi-parallel liquid alkali metal delivery pipeline system 2. The RS485 remote control line 1-3 serves as the control transmission line.

[0040] The process of loading the alkali metal seeds into the high-pressure stainless steel syringe is as follows: the high-pressure stainless steel syringe 1-1 is placed in a constant temperature glove box protected by vacuum or argon, the temperature is raised to above the melting point of the alkali metal, the special valve 1-5 is opened, the syringe piston handle is pulled backward, the liquid alkali metal seeds are sucked in, the special valve 1-5 is closed, and then the temperature is lowered. The alkali metal seeds are stored in the high-pressure stainless steel syringe 1-1 in a solid state.

[0041] like Figure 6As shown, the multi-way parallel liquid alkali metal delivery pipeline system 2 includes N first three-way connectors 2-1, N first one-way valves 2-2 and liquid alkali metal delivery pipelines, where N is an integer greater than 1, and in this embodiment, N is equal to 5. The liquid alkali metal delivery pipeline includes several sections of stainless steel pipes. One end of each of the N first three-way connectors 2-1 is connected to a syringe-specific valve 1-5 of a programmable high-pressure stainless steel injection pump through a stainless steel pipe, one end is connected to the outlet of a bypass purge valve 3-2 of the multi-way parallel inert gas supply and delivery pipeline system through a stainless steel pipe, and the other end is connected to 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 to the upstream first three-way connector 2-1 through a stainless steel pipe, and the outlet ends are connected to the liquid alkali metal inlet connectors of N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring 4 through a stainless steel pipe.

[0042] The liquid alkali metal seeds flow through the branches of the N liquid alkali metal delivery pipelines, sequentially to the first three-way connector 2-1, the first one-way valve 2-2, and then into the liquid alkali metal connectors of the N pneumatic atomizing spray guns 4-1 of the pneumatic atomizing seed injection ring 4. The multi-channel parallel liquid alkali metal delivery pipeline system 2 is heated throughout by a constant-temperature electric heating cable to maintain the alkali metal seeds in a liquid state. The heating temperature is approximately 20°C to 30°C above the melting point of the alkali metal.

[0043] like Figure 6As shown, the multi-way parallel inert gas supply and delivery pipeline system 3 includes 2N-1 second three-way connectors 3-1, N bypass purge valves 3-2, N inert gas on / off 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, is 5. The inert gas delivery pipeline comprises several sections of stainless steel pipe. The 2N-1 second three-way connectors 3-1 are connected in series via stainless steel pipes and are arranged in order from upstream to downstream, numbered 1 to 2N-1. The third ends of the first to Nth second three-way connectors 3-1 are respectively connected to the inlets of the N bypass purge valves 3-2 via stainless steel pipes. The third ends of the N+1th to 2N-1th second three-way connectors 3-1 are respectively connected to the inlets of the N inert gas on / off solenoid valves 3-3 via stainless steel pipes. The first end of the first second three-way connector 3-1 is connected to the outlet of the second one-way valve 3-4 via stainless steel pipes. The second end of the 2N-1 second three-way connector 3-1 is connected to the inlet of an inert gas switch solenoid valve 3-3 via a stainless steel tube. The outlets of the N inert gas switch solenoid valves 3-3 are connected to the inert gas inlet connectors of the N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring 4 via stainless steel tubes. The outlets of the N bypass purge valves 3-2 are connected to the N first three-way connectors 2-1 of the multi-way parallel liquid alkali metal delivery pipeline system 2 via stainless steel tubes. The bypass purge valve 3-2 is a ball valve or solenoid valve driven by a motor. The inlet of the second one-way valve 3-4 is connected to the inert gas outlet of the inert gas heating furnace 5-2 of the inert gas heating furnace system 5 via a stainless steel tube. The multi-channel parallel inert gas supply and delivery pipeline system 3 is heated by a constant temperature electric heating tape throughout the entire process. The heating temperature is 20℃ to 30℃ higher than the melting point of the alkali metal, which maintains the inert gas temperature in the inert gas supply and delivery pipeline. When mixed with the alkali metal, the alkali metal will not solidify due to heat exchange and block the pipeline.

[0044] like Figure 6 As shown, the pneumatic atomization seed injection ring 4 includes N pneumatic atomization lances 4-1 and an injection ring flange 4-2, where N is an integer greater than 1 and, in this embodiment, is equal to 5. The injection ring flange 4-2 is assembled and docked with the magnetohydrodynamic power generation ionization chamber and the magnetohydrodynamic power generation mixing chamber. The N pneumatic atomization lances 4-1 are evenly distributed around the circumference of the injection ring flange 4-2 and are vertically embedded in the circumferential sidewall of the injection ring flange 4-2, penetrating from the outside of the injection ring flange 4-2. The front ends of the N pneumatic atomization lances 4-1 extend flush with the inner wall of the injection ring flange 4-2. Each pneumatic atomization lance 4-1 has the same dimensions.

[0045] The pneumatic atomizing spray gun 4-1 consists of a liquid alkali metal inlet connector, an inert gas inlet connector for atomizing gas, a mixing chamber at the front end of the pneumatic nozzle, internal piping, and external piping. The liquid alkali metal inlet connector is located directly behind the nozzle of the pneumatic atomizing spray gun 4-1. Liquid alkali metal seeds flow into the mixing chamber at the front end of the pneumatic nozzle through the internal piping of the pneumatic atomizing spray gun. The inert gas inlet connector for atomizing gas is located at the rear end of the side wall of the pneumatic atomizing spray gun 4-1. Inert gas flows into the mixing chamber at the front end of the pneumatic nozzle through the external piping of the pneumatic atomizing spray gun. The mixing chamber at the front end of the pneumatic nozzle is directly connected to the inner pipeline and the outer pipeline of the pneumatic atomizing spray gun. The inert gas flow in the outer pipeline flows forward in a spiral manner. Driven by the inert gas, the liquid alkali metal seeds in the mixing chamber at the front end of the pneumatic nozzle are broken up, dispersed and atomized, and evenly mixed with the inert gas. Under the push of high pressure, they are ejected from the nozzle of the mixing chamber at the front end of the pneumatic nozzle and injected into the main airflow. They intersect and mix with the high-temperature main airflow in the injection ring at right angles, thereby achieving quantitative injection of the liquid alkali metal seeds and evenly distributing them in the main airflow.

[0046] like Figure 6 As shown, the inert gas heating furnace system 5 includes a high-pressure inert gas source 5-1, an inert gas heating furnace 5-2 and an inert gas delivery pipeline; the inert gas delivery pipeline includes several sections of stainless steel pipes; the high-pressure inert gas source 5-1 is connected to the inert gas inlet of the inert gas heating furnace 5-2 through a section of inert gas delivery pipeline, and the inert gas outlet of the inert gas heating furnace 5-2 is connected to the inlet of the second one-way valve 3-4 of the multi-way parallel inert gas supply and delivery pipeline system 3; the inert gas heating furnace 5-2 has an operating temperature of 300 degrees Celsius to 700 degrees Celsius and an operating voltage of 220V AC. The heating furnace is a three-layer design, with an outer layer of a stainless steel shell, a middle layer of insulating asbestos and a heating coil, and an inner layer of an iron cylindrical container. The container has an inert gas inlet and an inert gas outlet.

[0047] like Figure 6 As shown, the bypass purge valve 3-2 and inert gas switch solenoid valve 3-3 of the multi-way parallel inert gas supply and delivery pipeline system 3, the stepper motor actuator 1-2 of the programmable high-pressure stainless steel injection pump 1, and the dedicated valve 1-5 need to be placed in a ferromagnetic shield 6. The ferromagnetic shield 6 is a hexahedral iron magnetic shield that prevents the leakage magnetic field of the magnetohydrodynamic electromagnet from interfering with the electronically controlled valve and stepper motor actuator.

[0048] The present invention utilizes a programmable high-pressure stainless steel syringe pump, the PHD4400, with a maximum thrust of 91 kg, a minimum flow rate of 3.06 pl / min, a maximum flow rate of 216 pl / min, and an accuracy of 0.35%. The liquid alkali metal seed injection rate under rated operating conditions is approximately 26 mL / min to 56 mL / min, and the flow rate per spray gun is set at 5.2 mL / min to 11.2 mL / min.

[0049] Before operating the device of the present invention, the required parameters are first set on the syringe pump remote controller 1-4, including syringe material parameters, push mode, injection flow rate of the alkali metal seed, and total injection volume. The system's fully constant-temperature electric heating and the heating power supply of the inert gas heating furnace 5-2 are activated, the temperature is set, and the system waits until all components have reached the set temperature. The outlet valve of the high-pressure inert gas source 5-1 is opened, and the output pressure is adjusted to 0.2 to 0.3 MPa above the main gas pressure. Simultaneously, the N bypass purge valves 3-2 of the multi-way parallel inert gas supply and delivery pipeline system 3 are opened to purge the liquid metal pipeline for 5 minutes. Simultaneously, the N bypass purge valves 3-2 of the multi-way parallel inert gas supply and delivery pipeline system 3 are closed, and the N inert gas switch solenoid valves 3-3 are opened to purge the inert gas pipeline. N is an integer greater than 1, and in this embodiment, N is 5.

[0050] The dedicated valve 1-5 is opened, the high-pressure stainless steel injection pump 1 is in operation, and the liquid alkali metal seeds are simultaneously output from the front ends of N high-pressure stainless steel syringes 1-1, through the dedicated valve 1-5, the first three-way connector 2-1, the first one-way valve 2-2, and the injection ring pneumatic atomizing spray gun. After passing through the flow channel inside the spray gun, the seeds reach the mixing chamber at the front end of the spray gun and mix with the inert gas. The seeds are ejected from the nozzle of the mixing chamber at the front end of the pneumatic nozzle and injected into the main airflow in the injection ring. N is an integer greater than 1. In this embodiment, N is equal to 5.

[0051] The present invention does not describe in detail parts that belong to the common knowledge of those skilled in the art. The above-described embodiments are merely descriptions of preferred embodiments of the present invention. The preferred embodiments do not describe all details in detail, nor do they limit the invention to the specific embodiments described. Without departing from the spirit of the present invention, various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A multi-channel parallel quantitative equal flow synchronous injection alkali metal seed system, characterized by: The alkali metal seed system comprises a programmable high-pressure stainless steel injection pump (1), a multi-channel parallel liquid alkali metal delivery pipeline system (2), a multi-channel parallel inert gas supply and delivery 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 output port of the multi-channel parallel liquid alkali metal delivery pipeline system (2), the input port and output port of the multi-channel parallel inert gas supply and delivery pipeline system (3) and the bypass purge port, and the pneumatic atomization spray gun of the pneumatic atomization seed injection ring (4) are all 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 transported from the high-pressure inert gas source (5-1) to the inert gas heating furnace (5-2) for heating, and then transported to a multi-channel parallel inert gas supply and delivery pipeline system (3) for diversion; liquid alkali metal seeds are simultaneously pushed out from the N high-pressure stainless steel syringes (1-1) of a programmable high-pressure stainless steel injection pump (1), where N is an integer greater than 1, and enter the N pneumatic atomizing spray guns (4-1) of a pneumatic atomizing seed injection ring (4) through the corresponding N parallel branches of the multi-channel parallel liquid alkali metal delivery pipeline system (2), directly reaching the mixing chamber at the end of the spray gun, and mixing with the inert gas from the multi-channel parallel inert gas supply. The liquid alkali metal seeds are mixed with the inert gas rotating in the mixing chamber at the end of the spray gun input by the delivery pipeline system (3), and are pneumatically atomized and ejected from the nozzle of the mixing chamber at the end of the spray gun, with the ejection direction intersecting the main air flow in the injection ring at a 90-degree angle, and are injected into the pneumatic atomization seed injection ring (4); the N pneumatic atomization spray guns (4-1) correspond to N liquid alkali metal delivery pipelines, N inert gas delivery pipelines and N bypass purge branches, N being an integer greater than 1, and each pneumatic atomization spray gun (4-1) has and only corresponds to one liquid alkali metal delivery pipeline, one inert gas supply and delivery pipeline and one bypass purge branch, and the liquid alkali metal seed flow rate of each liquid alkali metal delivery pipeline is are all the same; the liquid alkali metal seeds remain in liquid form throughout the entire process from output by the injection pump to the mixing chamber at the front end of the nozzle where they are injected into the main airflow. Due to the quantitative output characteristics of the injection pump and the incompressible characteristics of the liquid, the flow rate of the liquid alkali metal seeds injected into the main airflow is not affected by the pressure fluctuations of the main airflow, and the flow rate of the liquid alkali metal seeds can be accurately pushed to achieve trace quantitative injection; since the lengths of the branches of the liquid alkali metal delivery pipeline are the same, the internal and external cross-sectional areas of the pipelines are the same, and the internal and external cross-sectional areas of the inert gas supply and delivery pipelines are the same, under the premise that the seed flow rates of the branches of the liquid alkali metal delivery pipeline are the same, the flow time of the liquid alkali metal seeds in the pipelines is the same, and the delivery of the liquid alkali metal seeds is synchronized;The system uses a multi-channel parallel connection method, with each syringe corresponding to a spray gun. The flow rate of each spray gun is the same and there is no flow interruption problem. The seed fraction of the main gas mixture remains uniform and stable in space, meeting the precise requirements of the non-equilibrium ionization conditions of the disk magnetohydrodynamic generator for seed quantity and seed spatial distribution.

2. The alkali metal seed system according to claim 1, characterized in that: The programmable high-pressure stainless steel injection pump (1) includes N high-pressure stainless steel syringes (1-1) with constant temperature electric heating cables, a stepper motor actuator (1-2), a control transmission line, a programmable controller and N syringe-specific valves (1-5), where N is an integer greater than 1. The syringes of the N high-pressure stainless steel syringes (1-1) are fixed on a single stepper motor actuator (1-2). The stepper motor actuator (1-2) simultaneously pushes the N high-pressure stainless steel syringes (1-1) to output liquid alkali metal seeds. The liquid alkali metal seeds The liquid flows into N parallel liquid alkali metal delivery pipelines through N syringe-specific valves (1-5), and the stepper motor actuator (1-2) is connected to the programmable controller through a control transmission line; the front end of the high-pressure stainless steel syringe (1-1) is the syringe head, and the rear end of the high-pressure stainless steel syringe is the piston handle; the syringe-specific valve (1-5) is installed at the front end of the syringe head of the high-pressure stainless steel syringe (1-1), and is a ball valve or solenoid valve driven by a motor; the syringe shell of the high-pressure stainless steel syringe (1-1) is attached with a constant temperature electric heating tape.

3. The alkali metal seed system according to claim 1, characterized in that: The multi-way parallel liquid alkali metal delivery pipeline system (2) comprises N first three-way connectors (2-1), N first one-way valves (2-2) and liquid alkali metal delivery pipelines, where N is an integer greater than 1; the liquid alkali metal delivery pipeline comprises a plurality of sections of stainless steel pipes, and the lengths of the branches of the N liquid alkali metal delivery pipelines are the same, and the inner and outer cross-sectional areas of the pipelines are the same; one end of each of the N first three-way connectors (2-1) is connected to a syringe-specific valve (1-5) of a programmable high-pressure stainless steel injection pump through a stainless steel pipe, one end is connected to the outlet of a bypass purge valve (3-2) of the multi-way parallel inert gas supply and delivery pipeline system through a stainless steel pipe, and the other end is connected to a first one-way valve ( 2-2); the inlet ends of the N first one-way valves (2-2) are connected to the upstream first three-way joint (2-1) through stainless steel pipes, and the outlet ends are connected to the 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 flow in sequence through the branches of the N liquid alkali metal delivery pipelines (2) to the first three-way joint (2-1), the first one-way valve (2-2), and then flow into the liquid alkali metal joints of the N pneumatic atomizing spray guns (4-1) of the pneumatic atomizing seed injection ring (4); the multi-way parallel liquid alkali metal delivery pipeline system (2) is heated by a constant temperature electric heating tape throughout the process to keep the alkali metal seeds in the pipeline in a liquid state, and the heating temperature is 20°C to 30°C higher than the melting point of the alkali metal.

4. The alkali metal seed system according to claim 1, wherein: The multi-way parallel inert gas supply and delivery pipeline system (3) comprises 2N-1 second three-way joints (3-1), N bypass purge valves (3-2), N inert gas switch solenoid valves (3-3), a second one-way valve (3-4) and an inert gas delivery pipeline, wherein N is an integer greater than 1; the inert gas delivery pipeline comprises a plurality of sections of stainless steel pipes, the lengths of the branches of the inert gas delivery pipelines are the same, and the inner and outer cross-sectional areas of the pipelines are the same; the 2N-1 second three-way joints (3-1) are connected by non- The stainless steel pipes are connected in series and arranged in sequence from upstream to downstream in the order of serial numbers 1 to 2N-1. The third ends of the first to Nth second three-way joints (3-1) are respectively connected to the inlets of N bypass purge valves (3-2) through stainless steel pipes; the third ends of the N+1th to 2N-1th second three-way joints (3-1) are respectively connected to the inlets of N inert gas switch solenoid valves (3-3) through stainless steel pipes; the first end of the first second three-way joint (3-1) is connected to 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 connector (3-1) is connected to the inlet of an inert gas switch solenoid valve (3-3) through a stainless steel pipe; the outlets of the N inert gas switch solenoid valves (3-3) are connected to the inert gas inlet connectors of the N pneumatic atomizing spray guns of the pneumatic atomizing seed injection ring (4) through stainless steel pipes; the outlets of the N bypass purge valves (3-2) are connected to the N first three-way connectors (2-1) of the multi-way parallel liquid alkali metal delivery pipeline system (2) through stainless steel pipes, and the bypass purge valves (3-2) is a ball valve or solenoid valve driven by a motor; the inlet of the second one-way valve (3-4) is connected to 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 multi-way parallel inert gas supply and delivery pipeline system (3) is heated by a constant temperature electric heating tape throughout the entire process, and the heating temperature is 20°C to 30°C higher than the melting point of the alkali metal, so as to maintain the inert gas temperature in the inert gas supply and delivery pipeline, so that the alkali metal will not solidify due to heat exchange when mixed with the alkali metal, thereby clogging the pipeline.

5. The alkali metal seed system according to claim 1, characterized in that: 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 greater than 1, and the N pneumatic atomization spray guns (4-1) of the same size are evenly distributed around the circumference of the injection ring flange (4-2), penetrate radially from the outer wall of the injection ring flange (4-2), and the front end faces of the pneumatic atomization spray guns (4-1) are flush with the inner wall of the injection ring flange (4-2) or slightly retracted into the inner wall by 1 to 2 mm; N is an integer greater than 1; the pneumatic atomization seed injection ring (4) is equipped with a sensor for monitoring temperature, and the pneumatic atomization seed injection ring (4) is heated by a high-temperature main airflow flowing therethrough.

6. The alkali metal seed system according to claim 1, characterized in that: The inert gas heating furnace system (5) includes a high-pressure inert gas source (5-1), an inert gas heating furnace (5-2) and an inert gas delivery pipeline; the inert gas delivery pipeline includes several sections of stainless steel pipes; the high-pressure inert gas source (5-1) is connected to the inert gas inlet of the inert gas heating furnace (5-2) through a section of inert gas delivery pipeline, and the inert gas outlet of the inert gas heating furnace (5-2) is connected to the inlet of the second one-way valve (3-4) of the multi-way parallel inert gas supply and delivery pipeline system (3); the inert gas heating furnace (5-2) has an operating temperature of 300 degrees Celsius to 700 degrees Celsius and an operating voltage of 220V AC. The heating furnace is a three-layer design, with an outer layer of a stainless steel shell, a middle layer of insulating asbestos and a heating coil, and an inner layer of an iron cylindrical container. The container has an inert gas inlet and an inert gas outlet.

7. The alkali metal seed system according to claim 1, characterized in that: The alkali metal seed system further comprises a ferromagnetic shielding cover, wherein the ferromagnetic shielding cover (6) is a hexahedral iron magnetic conductive cover, which has the function of preventing the leakage magnetic field of the magnetic fluid generating electromagnet from interfering with the electric control valve and the stepper motor actuator. The N bypass purge valves (3-2) of the multi-way parallel inert gas supply and delivery pipeline system (3), the N inert gas switch solenoid valves (3-3), the stepper motor actuator (1-2) of the programmable high-pressure stainless steel injection pump (1) and the N specially matched valves (1-5) need to be placed in the ferromagnetic shielding cover (6).

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