CN110848565A - Xenon filling system and method - Google Patents

Abstract

The invention discloses a xenon gas filling system and method, belonging to the technical field of propellant filling of space propulsion systems. The xenon gas filling system includes a xenon gas storage tank, an electric heater, a gas source valve, an on-board gas cylinder, a filling valve, a weighing device for on-board gas cylinders, a vacuum pump, a vacuum valve, a helium gas valve, a helium gas cylinder, and a deflation. Valves, recovery devices, recovery valves, absolute pressure gauges, purity analyzers and incubators are used to cool the xenon storage tank through the incubator, so that the xenon in the xenon storage tank is in a gas-liquid two-phase saturation state, so that under the action of gravity The liquid xenon is in the lower part of the xenon storage tank, and the gaseous xenon is in the upper part of the xenon storage tank. The electric heater is arranged on the top of the xenon storage tank to heat the gaseous xenon in the upper part of the xenon storage tank to increase the pressure of the xenon storage tank. By increasing the pressure of the xenon storage tank, the liquid xenon in the lower part of the xenon storage tank is squeezed to In the gas bottle on the star, the xenon gas filling is completed at one time. The above-mentioned xenon gas filling system has a simple structure, which improves the filling speed and filling density.

Description

A xenon gas filling system and method

technical field

The invention belongs to the technical field of propellant filling of space propulsion systems, and in particular relates to a xenon gas filling system and method, which are suitable for filling processes of all propulsion systems using high-purity xenon gas as propellant.

Background technique

The electric propulsion system has a high specific impulse, which can effectively reduce the total mass of the spacecraft, increase the payload, and prolong the on-orbit life. Electric propulsion systems can be used on almost all types of spacecraft, such as orbit transfer, position maintenance and de-orbit processing of synchronous communication satellites. Among them, the most commonly used working medium for electric propulsion systems is xenon. In the electric propulsion system, the purity of xenon gas is very high, and the content of water and oxygen must not exceed 2ppm. Once this requirement is exceeded, it is easy to cause cathodic oxidation of the electric thruster, resulting in loss of life.

In addition, in order to reduce the volume of the gas cylinders on the star, it is also necessary to require a high filling density of xenon gas, such as the density of xenon gas filling of the American Deep Space 1 detector is 1660kg/m ³ , and the density of xenon gas filling of the Swedish SMART-1 detector is 1700kg /m ³ , the ground xenon source density is generally below 1100kg/m ³ . Therefore, in electric propulsion systems, the high-purity and high-density filling of xenon gas is an urgent problem to be solved in practical applications.

In order to solve the high-purity and high-density filling problems of the above-mentioned xenon gas, the invention patent (CN104075104A) discloses a hot pressurizing xenon gas filling method for a satellite electric propulsion system, which includes first passing liquid nitrogen into the hot pressurizing device to make the heat increase The temperature of the high-pressure container in the pressure device decreases, so that the pressure of the xenon gas in the high-pressure container decreases with the decrease of the temperature. When the pressure of the xenon gas in the high-pressure container is lower than the pressure in the xenon gas storage tank, under the action of the pressure difference, the xenon gas storage tank The xenon in the high-pressure container will continuously flow into the high-pressure container; when the amount of xenon in the high-pressure container reaches the required value, the liquid nitrogen will be stopped, and the heating device in the thermal pressurization device will be activated to increase the temperature of the high-pressure container, so that the inside of the high-pressure container will be increased. The pressure of the xenon gas increases with the increase of temperature, which is higher than the pressure of the xenon gas in the gas cylinder on the satellite. Under the action of the pressure difference, the xenon gas in the high-pressure container will continuously flow into the gas cylinder on the satellite, so as to complete the filling process of the xenon gas . The above process is repeated until the filling amount meets the task requirements. However, the system in the hot pressurized xenon gas filling method of the satellite electric propulsion system is relatively complex, the filling amount per cycle is small, the filling speed is slow, and the filling density is low.

SUMMARY OF THE INVENTION

The invention provides a xenon gas filling system and method, so as to solve the problems of complicated system, small cyclic filling amount, slow filling speed and low filling density in the hot pressurized xenon gas filling method of the satellite electric propulsion system in the prior art The problem.

The technical solution of the present invention is:

A xenon gas filling system, comprising: a xenon gas storage tank, an electric heater, a gas source valve, an on-board gas cylinder, a filling valve, a on-board gas cylinder weighing device, a vacuum pump, a vacuum valve, a helium gas valve, and a helium gas cylinder , vent valve, recovery device, recovery valve, absolute pressure gauge, purity analyzer and incubator;

Among them, the electric heater is arranged on the top of the xenon gas storage tank, and the xenon gas storage tank is connected with the gas cylinder on the satellite through the gas source valve and the filling valve;

The vacuum pump is connected to the on-board gas cylinder through a vacuum valve, an absolute pressure gauge, a purity analyzer and a filling valve;

The helium cylinder is connected to the on-board cylinder through a helium valve, an absolute pressure gauge, a purity analyzer and a filling valve;

The recovery device is connected to the on-board gas cylinder through a recovery valve, an absolute pressure gauge, a purity analyzer and a filling valve;

The on-board gas cylinder weighing device is connected to the lower part of the on-board gas cylinder;

The air release valve is connected with the gas cylinder on the star through the filling valve;

The xenon storage tank, electric heater, gas source valve, on-board gas cylinder, filling valve and on-board gas cylinder weighing device are placed in the thermostat.

The electric heater is arranged on the top of the xenon gas storage tank to heat the gaseous xenon in the upper part of the xenon gas storage tank and increase the pressure of the xenon gas storage tank, so as to realize the liquid xenon in the lower part of the xenon gas storage tank by increasing the pressure of the xenon gas storage tank. Squeeze into the gas cylinder on the star to complete the filling in one go.

Place the xenon gas storage tank, electric heater, gas source valve, on-board gas cylinder, filling valve and on-board gas cylinder weighing device in the incubator to cool the xenon gas storage tank through the incubator, so that the xenon gas storage tank can be cooled down. The xenon is in a gas-liquid two-phase saturated state, so that under the action of gravity, the liquid xenon is located in the lower part of the xenon storage tank, and the gaseous xenon is located in the upper part of the xenon storage tank.

The beneficial effects of this system are:

1. By setting the electric heater on the top of the xenon gas storage tank, the gaseous xenon in the upper part of the xenon gas storage tank is heated, and the pressure of the xenon gas storage tank is increased, so that by increasing the pressure of the xenon gas storage tank, it will be in the lower part of the xenon gas storage tank. The liquid xenon is squeezed into the gas cylinder on the star, and the filling is completed at one time. It is not necessary to first flow the xenon gas in the xenon gas storage tank into the high-pressure container through the pressure difference, and then make the xenon gas in the high-pressure container flow into the on-board gas cylinder through the pressure difference, and so on to complete the filling of the xenon gas.

2. By increasing the pressure of the xenon gas storage tank, the liquid xenon in the lower part of the xenon gas storage tank is squeezed into the gas cylinder on the star, which simplifies the xenon gas filling system and improves the filling speed and filling density.

Preferably, in the xenon gas filling system, the xenon gas storage tank, gas source valve, on-board gas cylinder, filling valve, vacuum pump, vacuum valve, helium gas valve, helium gas cylinder, air release valve, recovery device, recovery valve , Absolute pressure gauge and purity analyzer are connected by connecting pipes.

The beneficial effect of the preferred solution is: connect the xenon gas storage tank, the gas source valve, the on-board gas cylinder, the filling valve, the vacuum pump, the vacuum valve, the helium gas valve, the helium gas cylinder, the gas discharge valve, the recovery device, and the recovery valve through the connecting pipeline , absolute pressure gauge and purity analyzer to realize the process of evacuation, helium replacement and xenon filling of the xenon filling system.

Preferably, the length of the connecting pipe is l.

Preferably, the outlet position of the xenon gas storage tank is arranged below the xenon gas storage tank, and the outlet position is higher than the on-board gas cylinder in the vertical direction.

The beneficial effect of the preferred solution is: by setting the outlet position of the xenon gas storage tank below the xenon gas storage tank, the outlet position is higher than the gas cylinder on the star in the vertical direction, so as to realize the use of gravity to squeeze the liquid xenon on the star. gas cylinder.

Preferably, the displayed number of the absolute pressure gauge is smaller than that of the xenon gas storage tank, the gas source valve, the on-board gas cylinder, the filling valve, the vacuum valve, the helium gas valve, The minimum withstand pressure value in the helium cylinder, the air release valve, the recovery device, the recovery valve, the purity analyzer and the connecting pipeline.

The beneficial effect of the preferred solution is: by setting the displayed number to be less than the minimum withstand pressure value, to ensure the safe operation of the xenon gas filling system.

A xenon gas filling method, comprising the following steps:

a. The xenon gas storage tank is cooled by an incubator. When the temperature of the xenon gas storage tank matches the target filling density, the xenon gas storage tank is thermostatically controlled based on the first preset time. For a preset time, the thermostatic control of the xenon gas storage tank is stopped;

b. Start the vacuum pump, open the filling valve, the vacuum valve and the recovery valve, and evacuate the on-board gas cylinder, the recovery device and the first connecting pipeline through the vacuum pump. When the on-board gas cylinder, the recovery device and all the When the vacuum degree of the first connecting pipeline all reaches the preset standard pressure, close the respective valves of the filling valve, the vacuum valve and the recovery valve, close the vacuum pump, and stop the on-board gas The bottle, the recovery device and the first connecting pipe are evacuated;

c. Open the incubator, and control the temperature of the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the filling valve through the incubator. When the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the When the temperature of the filling valve is all 0°C, thermostatic control is performed on the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the filling valve based on the second preset time. For the second preset time, the thermostatic control of the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the filling valve is stopped;

d. Open the helium valve and filling valve, and fill the on-board gas cylinder with helium gas through the helium gas cylinder. When the absolute pressure gauge shows a stable number, close the helium gas valve; Whether the helium purity of the on-board gas cylinder satisfies the preset helium purity, if the helium purity of the on-board gas cylinder does not meet the preset helium purity, open the vent valve, and when the absolute pressure gauge When the displayed number drops to the preset air pressure, close the air release valve;

d'. Repeat step d, if the helium purity of the gas cylinder on the star meets the preset helium purity, then close the air release valve;

e. Start the vacuum pump, open the filling valve, the vacuum valve and the recovery valve, and evacuate the on-board gas cylinder, the recovery device and the second connecting pipeline through the vacuum pump. When the vacuum degrees of the two connecting pipes all reach the preset standard pressure, close the respective valves of the filling valve, the vacuum valve and the recovery valve, close the vacuum pump, stop the on-board gas cylinder, The recovery device and the second connecting pipeline are evacuated;

f. Open the filling valve, open the gas source valve according to the preset opening time and interval time, when the pressure of the third connecting pipeline reaches the preset range and the display of the absolute pressure gauge is stable, analyze by the purity analyzer Whether the xenon gas purity of the on-board gas cylinder meets the preset xenon gas purity, if the xenon gas purity of the third connecting pipeline does not meet the preset xenon gas purity, open the recovery valve, and when the absolute pressure gauge shows a drop When the preset recovery pressure is reached, close the recovery valve;

f'. Repeat step f, if the xenon gas purity of the gas cylinder on the star meets the preset xenon gas purity, then close the recovery valve;

g. Open the gas source valve and the filling valve, and start the electric heater to heat the gaseous xenon in the xenon gas storage tank, so that the liquid xenon in the xenon gas storage tank is filled into the on-board gas cylinder, and the on-board gas cylinder is passed through. The weighing device weighs the on-board gas cylinder, and when the weight of the on-board gas cylinder reaches the preset weight, the gas source valve and the filling valve are closed;

h. Open the recovery valve to recover the xenon gas in the third connecting pipeline connecting the gas source valve, the filling valve and the recovery valve. When the indication of the absolute pressure gauge drops to the preset recovery pressure, Close the recovery valve.

Preferably, the first connecting pipeline is a connecting pipeline for connecting a vacuum pump, a filling valve, a vacuum valve, a recovery valve, an onboard gas cylinder and a recovery device;

The second connecting pipeline is a connecting pipeline for connecting a vacuum pump, a filling valve, a vacuum valve, a recovery valve, an on-board gas cylinder and a recovery device;

The third connecting pipeline is the connecting pipeline between the xenon gas storage tank, the gas source valve, the filling valve and the gas cylinder on the star.

Preferably, the preset standard pressure is a value used for judging whether the vacuum pump completes the evacuation of the xenon gas filling system.

Preferably, the preset deflation pressure is a value used for judging whether the gas of the xenon gas filling system has been discharged;

The preset recovery pressure is a value used for judging whether the gas of the xenon gas filling system has been recovered.

Preferably, the first preset time is the time when the preset incubator cools the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the filling valve for the first time;

The second preset time refers to the preset time for the incubator to cool down the xenon gas storage tank, the gas source valve, the on-board gas cylinder and the filling valve for the second time.

The beneficial effect of this method is: firstly, the temperature of the xenon gas storage tank is cooled by the thermostat, so that the xenon in the xenon gas storage tank is in a gas-liquid two-phase saturated state, so that the liquid xenon is placed in the lower part of the xenon gas storage tank under the action of gravity, and the gaseous xenon gas is in the lower part of the xenon gas storage tank. At the upper part of the xenon storage tank; then directly through the electric heater on the top of the xenon storage tank to heat the gaseous xenon on the upper part of the xenon storage tank to increase the pressure of the xenon storage tank, by increasing the pressure of the xenon storage tank will be in the xenon storage tank The liquid xenon in the lower part is squeezed into the gas cylinder on the star, and the filling is completed at one time. It is not necessary to first flow the xenon in the xenon storage tank into the high-pressure container through the pressure difference, and then make the xenon in the high-pressure container flow into the gas cylinder on the star through the pressure difference. This cycle completes the entire filling process and simplifies the xenon filling system. , and does not need to be limited by the amount of xenon gas in the high-pressure container, which improves the filling speed and filling density.

Description of drawings

1 is a schematic diagram of a system composition based on the method of the present invention;

Figure 2 is a schematic flow chart of the method of the present invention.

In the accompanying drawings, the parts represented by each label are as follows: 1, xenon gas storage tank, 2, electric heater, 3, gas source valve, 4, on-board gas cylinder, 5, filling valve, 6, on-board gas cylinder scale Heavy equipment, 7, vacuum pump, 8, vacuum valve, 9, helium valve, 10, helium gas cylinder, 11, bleed valve, 12, recovery device, 13, recovery valve, 14, absolute pressure gauge, 15, purity Analyzer, 16, incubator.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

As shown in Figure 1, the xenon gas filling system includes a xenon gas storage tank 1, an electric heater 2, a gas source valve 3, an on-board gas cylinder 4, a filling valve 5, a on-board gas cylinder weighing device 6, a vacuum pump 7, a vacuum Valve 8, helium valve 9, helium cylinder 10, vent valve 11, recovery device 12, recovery valve 13, absolute pressure gauge 14, purity analyzer 15 and incubator 16;

Wherein, the electric heater 2 is arranged on the top of the xenon gas storage tank 1, and the xenon gas storage tank 1 is connected with the gas cylinder 4 on the satellite through the gas source valve 3 and the filling valve 5;

The vacuum pump 7 is connected to the on-board gas cylinder 4 through the vacuum valve 8, the absolute pressure gauge 14, the purity analyzer 15 and the filling valve 5;

The helium gas cylinder 10 is connected to the on-board gas cylinder 4 through a helium gas valve 9, an absolute pressure gauge 14, a purity analyzer 15 and a filling valve 5;

The recovery device 12 is connected to the on-board gas cylinder 4 through the recovery valve 13, the absolute pressure gauge 14, the purity analyzer 15 and the filling valve 5;

The on-board gas cylinder weighing device 6 is arranged below the on-board gas cylinder 4;

The air release valve 11 is connected with the gas cylinder 4 on the satellite through the filling valve 5;

The xenon gas storage tank 1 , the electric heater 2 , the gas source valve 3 , the on-board gas cylinder 4 , the filling valve 5 and the on-board gas cylinder weighing device 6 are placed in the incubator 16 .

Specifically, first, the temperature of the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4 and the filling valve 5 are pre-cooled by the thermostatic box 16. When the temperature of the xenon gas storage tank 1 is 0°C, based on the first preset The xenon storage tank 1 is thermostatically controlled over time. The first preset time refers to the preset time when the thermostat 16 cools the xenon gas storage tank 1 , the gas source valve 3 , the on-board gas cylinder 4 and the filling valve 5 for the first time. The first preset time in this embodiment is set to 4 hours, and may also be set to a longer time. Setting the first preset time to 4 hours can make the temperature of the xenon gas storage tank reach equilibrium, and can also shorten the pre-processing time and improve the work efficiency.

Since the critical temperature of the xenon gas is 16.6°C, when the temperature of the xenon gas storage tank 1 is 0°C, the xenon in the xenon gas storage tank 1 is in a gas-liquid two-phase saturation state. The temperature can be adjusted according to the filling density. In this paper, the filling target is 1500kg/m ³ , so 0°C is selected. If the filling density is higher, a lower temperature can be selected. It can be understood that when xenon is in a gas-liquid two-phase saturation state, the liquid xenon is located in the lower part of the xenon gas storage tank 1 under the action of gravity, and the gaseous xenon is located in the upper part of the xenon gas storage tank 1 . Placing the electric heater 2 on the top of the xenon storage tank 1 can only heat the gaseous xenon without heating the liquid xenon, so that the liquid xenon in the lower part of the xenon storage tank 1 can be filled by increasing the pressure of the xenon storage tank 1 into the star tank.

After the thermostatic control of the xenon gas storage tank is completed based on the first preset time, the vacuum pump 7 is started, the filling valve 5, the vacuum valve 8 and the recovery valve 13 are opened, and the on-board gas cylinder 4, the recovery device 12 and the first connecting pipeline are pumped. Vacuum, when the above-mentioned filling valve 5, vacuum valve 8 and recovery valve 13, the vacuum degree of the gas cylinder 4, the recovery device 12 and the first connecting pipeline on the satellite all reach the preset standard pressure, close the above-mentioned filling valve 5, The valves corresponding to the vacuum valve 8 and the recovery valve 13 are closed, and the vacuum pump is turned off to stop the vacuuming of the on-board gas cylinder 4, the recovery device 12 and the first connecting pipeline. Among them, the first connecting pipeline refers to the connecting pipeline used to connect the vacuum pump 7 , the filling valve 5 , the vacuum valve 8 , the recovery valve 13 , the onboard gas cylinder 4 and the recovery device 12 . The preset standard pressure refers to a value used to judge whether the vacuum pump completes the evacuation of the xenon gas filling system. The preset standard pressure can be set by the staff according to the actual situation. The preset standard pressure in this embodiment is set to 5Pa. , the effect is better.

When the vacuuming of the on-board gas cylinder 4, the recovery device 12 and the first connecting pipeline is stopped, the incubator 16 is opened, and the temperature of the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4 and the filling valve 5 is controlled. , when the temperature of the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4 and the filling valve 5 are all 0°C, the xenon gas storage tank 1, the gas source valve 3, the on-board gas The bottle 4 and the filling valve 5 are thermostatically controlled. When the second preset time is reached, the thermostatic control of the xenon gas storage tank 1 , the gas source valve 3 , the on-board gas cylinder 4 and the filling valve 5 is stopped. The second preset time refers to the preset time when the thermostat 16 cools the xenon gas storage tank 1 , the gas source valve 3 , the on-board gas cylinder 4 and the filling valve 5 for the second time. In this embodiment, the second preset time is set to 0.5 hours, which can meet the cooling demand without wasting time and improve work efficiency.

After completing the temperature control of the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4, and the filling valve 5, open the helium gas valve 9 and the filling valve 5, and fill the on-board gas cylinder 4 with helium gas, After the pressure is 0.5MPa and the indication of the absolute pressure gauge 14 is stable, the helium valve 9 is closed. In this embodiment, the displayed indication of the absolute pressure gauge is within the preset fluctuation range (for example, the fluctuation does not exceed ±0.03MPa) within the preset stable time (for example, 1 min), which means that the displayed indication is stable. Then use the purity analyzer 15 to analyze the purity of the helium in the above-mentioned connecting pipeline. When the purity of the helium does not meet the preset helium purity, the vent valve 11 is opened. When the air pressure is set, it means that the helium in the xenon gas filling system is out of air, and the air release valve 11 is closed. The preset helium gas purity refers to a value used to judge whether the helium gas in the xenon gas filling system meets the requirements. The preset helium purity in this embodiment is O ₂ ≤2ppm, and H ₂ O≤2ppm. The preset discharge pressure refers to the value used to judge whether the gas of the xenon filling system has been discharged. The preset decompression pressure in this embodiment is set to 0.1 MPa.

After closing the air release valve 11, start the vacuum pump 7, open the filling valve 5, the vacuum valve 8 and the recovery valve 13, and use the vacuum pump 7 to evacuate the gas cylinder 4, the recovery device 12 and the second connecting pipeline on the satellite. When the vacuum degrees of the gas cylinder 4, the recovery device 12 and the second connecting pipeline all reach the preset standard pressure (such as 5Pa), close the valves corresponding to the filling valve 5, the vacuum valve 8 and the recovery valve 1, and close the vacuum pump 7, stop Evacuate the on-board gas cylinder 4, the recovery device 12 and the connecting pipeline. Among them, the second connecting pipeline refers to the connecting pipeline used to connect the vacuum pump 7 , the filling valve 5 , the vacuum valve 8 , the recovery valve 13 , the on-board gas cylinder 4 and the recovery device 12 .

When the vacuuming of the on-board gas cylinder 4, the recovery device 12 and the second connecting pipe is stopped, the purity of the xenon gas in the third connecting pipe needs to be analyzed. Since the xenon gas storage tank 1 in this embodiment is liquid xenon when it enters the third connecting pipe, so much liquid xenon cannot enter into the third connecting pipe, and only a small amount of liquid xenon can enter. When a small amount of liquid xenon enters the third connecting pipe, the liquid xenon will be vaporized due to the reduced pressure, and xenon gas can be obtained, so that the purity analyzer 15 can complete the analysis of the purity of the xenon gas in the third connecting pipe. The specific operation process is as follows: Step 1: Open the filling valve 5, open the gas source valve 3 according to the preset opening time (such as 0.25s) and interval time (such as 1s), and fill the third connecting pipe with xenon gas. After the pressure of the connecting pipe reaches the preset filling range, and the absolute pressure gauge 14 shows stable numbers, the purity analyzer 15 is used to analyze the purity of xenon gas on the third connecting pipe. If the purity of xenon gas is set, the recovery valve 13 is opened, and when the indication of the absolute pressure gauge 14 drops to the preset recovery pressure, the recovery valve 13 is closed. Step 2: Repeat Step 1. When the purity of the xenon gas in the third connecting pipeline meets the preset xenon gas purity, the recovery valve 13 is closed. Among them, the third connecting pipeline refers to the connecting pipeline between the xenon gas storage tank 1, the gas source valve 3, the filling valve 5 and the gas cylinder 4 on the satellite. The preset pressure range for the xenon gas purity analysis refers to the numerical range of the liquid xenon that is filled in the third connecting pipeline for performing the xenon gas purity analysis. The preset pressure range of xenon gas purity analysis in this embodiment is set to 0.4MPa-0.6MPa. The preset xenon gas purity refers to a value used to judge whether the xenon gas purity in the xenon gas filling system meets the requirements. The preset xenon gas purity set in this embodiment is O ₂ ≤2ppm, and H ₂ O≤2ppm. The preset recovery pressure refers to the value used to judge whether the gas of the xenon gas filling system has been recovered. The preset recovery pressure in this embodiment is set to 0.2MPa.

When the xenon gas purity of the third connecting pipeline meets the preset xenon gas purity, after closing the recovery valve 13, open the gas source valve 3 and the filling valve 5, and fill the liquid xenon in the xenon gas storage tank 1 into the on-board gas cylinder 4 . During the continuous filling of liquid xenon into the on-board gas cylinder 4, due to the continuous decrease of the pressure in the xenon gas storage tank 1, part of the liquid xenon will be vaporized in the connecting pipeline and the on-board gas cylinder 4, causing the on-board gas cylinder to gasify. The pressure in 4 increases, the pressure difference between the xenon storage tank 1 and the pressure of the gas cylinder 4 on the star decreases, and the filling speed will become slower. After a period of time, the pressure at both ends will be the same, and the filling will stop. At this time, it is necessary to turn on the electric heater 2 to heat the gaseous xenon in the xenon gas storage tank 1, so that the gaseous xenon in the xenon gas storage tank 1 is heated to expand, the pressure rises, and the lower liquid xenon is squeezed into the on-board gas cylinder 4 through the connecting pipe. .

During the filling process, the on-board gas bottle 4 is weighed in real time by the on-board gas bottle weighing device 6. When the weight of the on-board gas bottle 4 reaches the preset weight, it means the liquid xenon in the on-board gas bottle 4 The requirements have been met. At this time, close the air source valve 3 and the filling valve 5. Open the recovery valve 13 to recover the xenon gas in the xenon gas filling system. When the display of the absolute pressure gauge drops to the preset recovery pressure, it means that after the recovery is over, close the recovery valve 13 and the xenon gas filling process is completed.

By placing the xenon storage tank 1, the electric heater 2, the gas source valve 3, the on-board gas cylinder 4, the filling valve 5 and the on-board gas cylinder weighing device 6 in a constant temperature box, the xenon gas storage tank 1, Electric heater 2, gas source valve 3, on-board gas cylinder 4, filling valve 5 and on-board gas cylinder weighing device 6 are temperature controlled.

Further, as shown in FIG. 1 , the absolute pressure gauge 14 and the purity analyzer 15 are connected upstream of the filling valve 5 , and the on-board gas cylinder weighing device 6 is placed below the on-board gas cylinder 4 .

Further, as shown in FIG. 1 , the gas source valve 3 , the filling valve 5 , the vacuum valve 8 , the helium valve 9 , the air release valve 11 and the recovery valve 13 in this embodiment are connected to each other to ensure the filling of the entire xenon gas. The process went smoothly.

Preferably, as shown in FIG. 1 , in the xenon gas filling system, the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4, the filling valve 5, the vacuum pump 7, the vacuum valve 8, the helium gas valve 9, the helium gas The bottle 10, the purge valve 11, the recovery device 12, the recovery valve 13, the absolute pressure gauge 14, and the purity analyzer 15 are connected by connecting pipes.

Specifically, since the pressure of the xenon gas filling system is relatively high, it is necessary to use a connection pipe with strong pressure bearing capacity, so the connection pipe in this embodiment adopts a high-pressure metal hard pipe.

Preferably, the length of the connecting pipe is l.

In order to save xenon gas as much as possible and reduce waste, the length of the connecting pipeline in this embodiment is as short as possible, and the specific length can be determined according to the actual situation.

Specifically, it is used to connect the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4, the filling valve 5, the vacuum pump 7, the vacuum valve 8, the helium gas valve 9, the helium gas cylinder 10, the gas release valve 11, the recovery The length l of the connecting pipes of the device 12, the recovery valve 13, the absolute pressure gauge 14 and the purity analyzer 15 is as short as possible according to the actual situation, which can effectively reduce the amount of xenon gas recovered.

Preferably, the outlet position of the xenon gas storage tank 1 is arranged below the xenon gas storage tank 1 , and the outlet position is higher than the on-board gas cylinder 4 in the vertical direction.

Specifically, the outlet position of the xenon gas storage tank 1 is set below the xenon gas storage tank 1, and the outlet position of the xenon gas storage tank 1 is vertically higher than the on-board gas cylinder 4, so as to realize the use of gravity to remove the liquid xenon gas Discharge to onboard cylinder 4.

Preferably, the absolute pressure gauge 14 has a lower display value than the xenon storage tank 1, the gas source valve 3, the on-board gas cylinder 4, the filling valve 5, the vacuum valve 8, the helium valve 9, the helium cylinder 10, and the gas release valve. The valve 11, the recovery device 12, the recovery valve 13, the purity analyzer 15 and the minimum pressure resistance value in the connecting pipeline.

Specifically, by setting the display number less than the xenon gas storage tank, gas source valve, on-board gas cylinder, filling valve, vacuum valve, helium gas valve, helium gas cylinder, gas release valve, recovery device, recovery valve, absolute pressure The minimum withstand pressure value in the meter, purity analyzer and connecting pipeline to ensure the safe operation of the xenon gas filling system.

Further, in order to protect the safety of the xenon gas filling system, when the displayed number reaches the safety alarm value, the alarm device of the xenon gas filling system is activated to prompt the staff to make adjustments in time. The safety alarm value in this embodiment is set to 80% of the minimum withstand pressure value.

The beneficial effects of the present invention are: first, the temperature of the xenon gas storage tank 1 is cooled by the constant temperature box 16, so that the xenon in the xenon gas storage tank 1 is in a gas-liquid two-phase saturated state, so that the liquid xenon is placed in the lower part of the xenon gas storage tank under the action of gravity , the gaseous xenon is in the upper part of the xenon storage tank. Then start the vacuum pump to vacuumize the on-board gas cylinder 4, the recovery device 12 and the first connecting pipeline, so that the vacuum degree of the on-board gas cylinder 4, the recovery device 12 and the first connecting pipeline reaches the preset standard pressure. The gaseous xenon in the upper part of the xenon storage tank is heated directly by the electric heater on the top of the xenon storage tank to increase the pressure of the xenon storage tank, and the liquid xenon in the lower part of the xenon storage tank is squeezed to the star by increasing the pressure of the xenon storage tank. In the upper cylinder, the filling is completed at one time. It is not necessary to first flow the xenon in the xenon storage tank into the high-pressure container through the pressure difference, and then make the xenon in the high-pressure container flow into the gas cylinder on the star through the pressure difference. This cycle completes the entire filling process and simplifies the xenon filling system. , and does not need to be limited by the amount of xenon gas in the high-pressure container, which improves the filling speed and filling density.

As shown in Figure 2, a xenon filling method includes:

a. The temperature of the xenon gas storage tank 1 is cooled by the constant temperature box 16. When the temperature of the xenon gas storage tank 1 is 0°C (corresponding to the filling density of 1500kg/m ³ in this embodiment), the xenon gas storage tank 1 is stored based on the first preset time. The tank 1 is under constant temperature control, and when the first preset time is reached, the constant temperature control of the xenon gas storage tank 1 is stopped;

b. Start the vacuum pump 7, open the filling valve 5, the vacuum valve 8 and the recovery valve 13, and vacuum the on-board gas cylinder 4, the recovery device 12 and the first connecting pipe through the vacuum pump 7, when the on-board gas cylinder 4, the recovery device When the vacuum degree of 12 and the first connecting pipeline reaches the preset standard pressure, close the corresponding valves of the filling valve 5, the vacuum valve 8 and the recovery valve 13, close the vacuum pump 7, and stop the on-board gas cylinder 4 and the recovery device. 12 and the first connecting pipeline are evacuated;

c. Open the incubator 16, and control the temperature of the xenon gas storage tank 1, the gas source valve 3, the gas cylinder 4 and the filling valve 5 through the incubator 16. When the xenon gas storage tank 1, the gas source valve 3, the gas on the satellite When the temperature of the bottle 4 and the filling valve 5 are both 0°C, the xenon storage tank 1, the gas source valve 3, the gas cylinder 4 and the filling valve 5 are thermostatically controlled based on the second preset time. After the preset time, the thermostatic control of the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4 and the filling valve 5 is stopped;

d. Open the helium valve 9 and the filling valve 5, and fill the on-board gas cylinder 4 with helium gas through the helium gas cylinder 10. When the absolute pressure gauge 14 shows a stable number, close the helium gas valve 9; The analyzer 15 analyzes whether the helium purity of the onboard gas cylinder 4 meets the preset helium purity. If the helium purity of the onboard gas cylinder 4 does not meet the preset helium purity, the vent valve 11 is opened, and when the absolute pressure When the displayed value of Table 14 drops to the preset air pressure, close the air release valve 11;

d'. Repeat step d, if the helium purity of the gas cylinder 4 on the star satisfies the preset helium purity, then close the air release valve 11;

e. Start the vacuum pump 7, open the filling valve 5, the vacuum valve 8 and the recovery valve 13, and vacuum the on-board gas cylinder 4, the recovery device 12 and the second connecting pipeline through the vacuum pump 7, when the on-board gas cylinder 4, the recovery device When the vacuum degree of 12 and the second connecting pipeline reaches the preset standard pressure, close the corresponding valves of the filling valve 5, the vacuum valve 8 and the recovery valve 13, close the vacuum pump 7, and stop the on-board gas cylinder 4 and the recovery device. 12 and the second connecting pipeline are evacuated;

f. Open the filling valve 5, open the gas source valve 3 according to the preset opening time and interval time, when the pressure of the third connecting pipeline reaches the preset pressure range for xenon gas purity analysis, and the display of the absolute pressure gauge 14 is stable At the same time, the purity analyzer 15 is used to analyze whether the xenon gas purity of the gas cylinder 4 on the satellite meets the preset xenon gas purity. When the displayed number of , drops to the preset recovery pressure, close the recovery valve 13;

f'. Repeat step f, if the xenon gas purity of the gas cylinder 4 on the star meets the preset xenon gas purity, then close the recovery valve 13;

g. Open the gas source valve 3 and the filling valve 5, and heat the gaseous xenon in the xenon gas storage tank 1 by starting the electric heater 2, so that the liquid xenon in the xenon gas storage tank 1 is filled into the gas cylinder 4 on the star, through The on-board gas cylinder weighing device 6 weighs the on-board gas cylinder 4, and when the weight of the on-board gas cylinder 4 reaches the preset weight, the gas source valve 3 and the filling valve 5 are closed;

h. Open the recovery valve 13, and recover the xenon gas in the third connecting pipeline connecting the gas source valve 3, the filling valve 5 and the recovery valve 13, when the absolute pressure gauge 14 shows the display value drops to the preset recovery pressure , and close the recovery valve 13.

Preferably, the first connecting pipeline is a connecting pipeline for connecting the vacuum pump 7, the filling valve 5, the vacuum valve 8, the recovery valve 13, the on-board gas cylinder 4 and the recovery device 12;

The second connecting pipeline is a connecting pipeline for connecting the vacuum pump 7, the filling valve 5, the vacuum valve 8, the recovery valve 13, the on-board gas cylinder 4 and the recovery device 12;

The third connecting pipeline is the connecting pipeline between the xenon gas storage tank 1, the gas source valve 3, the filling valve 5 and the gas cylinder 4 on the star.

Preferably, the preset standard pressure is a value for judging whether the vacuum pump completes the evacuation of the xenon gas filling system.

Preferably, the preset deflation pressure is a value for judging whether the gas of the xenon gas filling system is completely discharged;

The preset recovery pressure is a value for judging whether the gas of the xenon gas filling system has been recovered.

Preferably, the first preset time is the time when the preset incubator 16 cools the xenon gas storage tank 1, the gas source valve 3, the on-board gas cylinder 4 and the filling valve 5 for the first time;

The second preset time refers to the preset time during which the thermostat 16 cools the xenon gas storage tank 1 , the gas source valve 3 , the on-board gas cylinder 4 and the filling valve 5 for the second time.

The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims (10)

1. A xenon gas filling system, characterized in that, comprising: a xenon gas storage tank (1), an electric heater (2), a gas source valve (3), an on-board gas cylinder (4), a filling valve (5) , on-board gas cylinder weighing device (6), vacuum pump (7), vacuum valve (8), helium valve (9), helium cylinder (10), air release valve (11), recovery device (12), Recovery valve (13), absolute pressure gauge (14), purity analyzer (15) and thermostat (16); Wherein, the electric heater (2) is arranged on the top of the xenon gas storage tank (1), and the xenon gas storage tank (1) is connected with the on-board gas cylinder (4) through the gas source valve (3) and the filling valve (5); The vacuum pump (7) is connected to the on-board gas cylinder (4) through a vacuum valve (8), an absolute pressure gauge (14), a purity analyzer (15) and a filling valve (5); The helium gas cylinder (10) is connected to the on-board gas cylinder (4) through a helium gas valve (9), an absolute pressure gauge (14), a purity analyzer (15) and a filling valve (5); The recovery device (12) is connected to the on-board gas cylinder (4) via a recovery valve (13), an absolute pressure gauge (14), a purity analyzer (15) and a filling valve (5); The on-board gas cylinder weighing device (6) is arranged below the on-board gas cylinder (4); The air release valve (11) is connected with the on-board gas cylinder (4) through the filling valve (5); The xenon gas storage tank (1), the electric heater (2), the gas source valve (3), the on-board gas cylinder (4), the filling valve (5) and the on-board gas cylinder weighing device (6) are placed in the incubator (16). 2. The xenon gas filling system according to claim 1, characterized in that: the xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4), the Valve (5), vacuum pump (7), vacuum valve (8), helium gas valve (9), helium gas cylinder (10), air release valve (11), recovery device (12), recovery valve (13), absolute The pressure gauge (14) and the purity analyzer (15) are connected by connecting pipes. 3 . The xenon gas filling system according to claim 2 , wherein the length of the connecting pipe is 1. 4 . 4. The xenon gas filling system according to claim 1 or 2, characterized in that: the outlet position of the xenon gas storage tank (1) is arranged below the xenon gas storage tank (1), and the outlet position is vertically Straight above the gas cylinder (4) on the star. 5. The xenon gas filling system according to claim 1 or 2, characterized in that: the display number of the absolute pressure gauge (14) is smaller than that of the xenon gas storage tank (1), the gas source valve (3) ), the on-board gas cylinder (4), the filling valve (5), the vacuum valve (8), the helium valve (9), the helium cylinder (10), the The minimum withstand pressure value in the gas valve (11), the recovery device (12), the recovery valve (13), the purity analyzer (15) and the connecting pipeline. 6. A method for filling xenon, comprising: a. Cool down the xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5) through the incubator (16). When the temperature matches the target filling density, the xenon gas storage tank (1) is thermostatically controlled based on a first preset time, and when the first preset time is reached, the xenon gas storage tank (1) is stopped thermostatic control; b. Start the vacuum pump (7), open the filling valve (5), vacuum valve (8) and recovery valve (13), through the vacuum pump (7), the on-board gas cylinder (4), recovery device (12) and The first connecting pipe is evacuated, and when the vacuum degrees of the on-board gas cylinder (4), the recovery device (12) and the first connecting pipe all reach a preset standard pressure, the filling valve (4) is closed. 5), the corresponding valve of the vacuum valve (8) and the recovery valve (13), and close the vacuum pump (7), stop the on-board gas cylinder (4), the recovery device (12) ) and the first connecting pipeline to be evacuated; c. Open the incubator (16), and use the incubator (16) to control the temperature of the xenon storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5). When the temperature of the xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5) are all 0°C, based on the second preset time The xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5) are thermostatically controlled, and when the second preset time is reached, Then stop the thermostatic control of the xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5); d. Open the helium valve (9) and the filling valve (5), and fill the on-board gas cylinder (4) with helium gas through the helium gas cylinder (10), when the absolute pressure gauge (14) shows a stable number Then, close the helium valve (9); analyze whether the helium purity of the on-board gas cylinder (4) meets the preset helium gas purity by a purity analyzer (15), if the on-board gas cylinder (4) ) of the helium purity does not meet the preset helium purity, then open the vent valve (11), and when the absolute pressure gauge (14) indicates that the displayed value drops to the preset vent pressure, close the vent valve (11). 11); d'. Repeat step d, if the helium purity of the gas cylinder (4) on the star meets the preset helium purity, then close the air release valve (11); e. Start the vacuum pump (7), open the filling valve (5), vacuum valve (8) and recovery valve (13), through the vacuum pump (7), the on-board gas cylinder (4), recovery device (12) and The second connecting pipe is evacuated, and when the vacuum degrees of the on-board gas cylinder (4), the recovery device (12) and the second connecting pipe all reach the preset standard pressure, the filling valve (5) is closed , the corresponding valve of the vacuum valve (8) and the recovery valve (13), and close the vacuum pump (7), stop the on-board gas cylinder (4), the recovery device (12) and The second connecting pipe is evacuated; f. Open the filling valve (5), open the air source valve (3) according to the preset opening time and interval time, when the pressure of the third connecting pipeline reaches the preset range, and the display of the absolute pressure gauge (14) shows When the number is stable, the purity analyzer (15) is used to analyze whether the xenon gas purity of the on-board gas cylinder (4) satisfies the preset xenon gas purity, and if the xenon gas purity of the third connecting pipe does not meet the preset xenon gas purity, open the A recovery valve (13), when the displayed value of the absolute pressure gauge (14) drops to a preset recovery pressure, the recovery valve (13) is closed; f'. Repeat step f, if the xenon gas purity of the on-board gas cylinder (4) satisfies the preset xenon gas purity, then close the recovery valve (13); g. Open the gas source valve (3) and the filling valve (5), and heat the gaseous xenon in the xenon gas storage tank (1) by starting the electric heater (2), so that the liquid xenon in the xenon gas storage tank (1) is heated. Xenon is added to the on-board gas cylinder (4), and the on-board gas cylinder (4) is weighed by the on-board gas cylinder weighing device (6). When the weight of the on-board gas cylinder (4) reaches If the weight is preset, close the air source valve (3) and the filling valve (5); h. Open the recovery valve (13), and recover the xenon gas in the third connecting pipeline connecting the gas source valve (3), the filling valve (5) and the recovery valve (13), when the absolute pressure gauge (14) When the displayed value of ) drops to the preset recovery pressure, close the recovery valve (13). 7 . The xenon gas filling method according to claim 6 , wherein the first connecting pipe is used for connecting a vacuum pump (7), a filling valve (5), a vacuum valve (8), and a recovery valve (13 ). 8 . ), the connecting pipeline of the gas cylinder (4) on the satellite and the recovery device (12); The second connecting pipeline is a connecting pipeline for connecting the vacuum pump (7), the filling valve (5), the vacuum valve (8), the recovery valve (13), the on-board gas cylinder (4) and the recovery device (12) ; The third connecting pipeline is the connecting pipeline between the xenon gas storage tank (1), the gas source valve (3), the filling valve (5) and the on-board gas cylinder (4). 8 . The xenon gas filling method according to claim 6 , wherein the preset standard pressure is a value used for judging whether the vacuum pump completes the evacuation of the xenon gas filling system. 9 . 9 . The xenon gas filling method according to claim 6 , wherein the preset deflation pressure is a value used for judging whether the gas of the xenon gas filling system is completely discharged; 10 . The preset recovery pressure is a value used for judging whether the gas of the xenon gas filling system has been recovered. 10. The xenon gas filling method according to claim 6, characterized in that, the first preset time is the first time that the preset thermostat (16) fills the xenon gas storage tank (1), the gas source valve (3) for the first time ), the cooling time of the on-board gas cylinder (4) and the filling valve (5); The second preset time means that the preset incubator (16) cools the xenon gas storage tank (1), the gas source valve (3), the on-board gas cylinder (4) and the filling valve (5) for the second time time.

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