A high liquefaction temperature mixed gas rapid filling device and filling method

Abstract

The present invention discloses a high liquefaction temperature mixed gas rapid filling device and filling method. The pressurized container applies pressure to the liquid phase environmentally friendly insulating medium by introducing high-pressure background gas, increasing its pressure so that it has sufficient pressure to output to the next link; the heating pipeline heats up the background gas and merges with the high liquefaction temperature insulating medium to accelerate its gasification; the mixed gas cavity has jet holes and stirring particles to make the background gas and the high liquefaction temperature insulating medium fully contact and evenly mix; the buffer gas chamber is equipped with a set of compressors to pressurize the mixed gas in the buffer gas chamber and replenish the target gas chamber. The present invention has the advantages of on-site portability, high gas distribution accuracy, and high filling rate, and solves the inflation and gas replenishment needs of environmentally friendly gas insulation equipment using high liquefaction temperature insulating medium during commissioning and operation and maintenance.

Description

Technical Field

[0001] The invention discloses a high liquefaction temperature mixed gas rapid filling device and filling method, and relates to the field of electrical technology. Background Art

[0002] Sulfur hexafluoride is an insulating gas widely used in gas-insulated equipment due to its outstanding insulation and arc-extinguishing properties. However, its greenhouse effect potential is 23,900 times that of carbon dioxide, which has attracted in-depth attention from relevant environmental protection departments and the power industry. Therefore, in the future use of gas-insulated equipment, new environmentally friendly gases with superior environmental performance will receive further attention. However, due to the high liquefaction temperature of several new environmentally friendly gases currently on the market, they are very likely to liquefy when the temperature is low or the gas pressure is high, especially the two new environmentally friendly gas insulation media C5F10O and C6F12O, whose liquefaction temperatures are 26.9℃ and 49.2℃ respectively, and they are liquid at room temperature, which greatly limits their efficiency of mixing and inflation with background gas.

[0003] At present, the domestic mixing and inflation of liquid environmentally friendly gases and gaseous background gases mainly adopts the partial pressure distribution method based on Dalton's principle. When inflating on site, the efficiency is low and the distribution accuracy is poor. In addition, when replenishing gas insulation equipment that already has a certain pressure, the conventional distribution method cannot add the environmentally friendly gas with a high liquefaction temperature according to the rated ratio. Summary of the invention

[0004] In view of the defects in the above-mentioned background technology, the present invention provides a high liquefaction temperature mixed gas rapid filling device and filling method to solve the technical problem of on-site rapid inflation and replenishment of environmentally friendly gas insulation equipment with high liquefaction temperature as insulating medium.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: a high liquefaction temperature mixed gas rapid filling device, comprising: a background gas container, an environmentally friendly insulating medium container, a boosting container and a mixed gas chamber, the background gas container is used to hold background gas; the environmentally friendly insulating medium container is used to hold environmentally friendly insulating medium that is in liquid phase at room temperature; the air inlet of the boosting container is connected to the air outlet of the background gas container, the liquid inlet of the boosting container is connected to the liquid outlet of the environmentally friendly insulating medium container, the air outlet of the boosting container is connected to a vacuum air pump, the liquid outlet of the boosting container is connected to the liquid inlet of the mixed gas chamber, the air outlet of the background gas container is connected to the air inlet of the mixed gas chamber, the mixed outlet of the mixed gas chamber is connected to the air inlet of the buffer gas chamber, and the mixed outlet of the mixed gas chamber and the air outlet of the buffer gas chamber are both used to connect to the target gas chamber; the boosting container, the buffer gas chamber and the target gas chamber are respectively provided with pressure gauges for observing the air pressure inside the boosting container, the buffer gas chamber and the target gas chamber.

[0006] Furthermore, the bottom of the pressurized container is arc-shaped and funnel-shaped. The pressurized container is arranged at the lower side of the environmentally friendly insulating medium container. Under the action of gravity, the liquid environmentally friendly insulating medium in the environmentally friendly insulating medium container will gather at the bottom of the pressurized container.

[0007] Furthermore, a gas mass flow meter and an oil bath heating pipeline are arranged between the background gas container and the mixed gas chamber. The gas mass flow meter has a large range and is used to measure the instantaneous flow rate and the cumulative flow rate of the background gas. The flow rate of the background gas from the background gas container is controlled by the large range of gas mass flow rate.

[0008] A liquid mass flow meter is arranged between the pressurized container and the mixed gas chamber. The liquid mass flow meter has a micro-range and is used to measure the instantaneous flow and cumulative flow of the environmentally friendly insulating medium. It has communication input and output functions and is used to monitor the flow output ratio in real time.

[0009] A liquid level sensor is arranged in the pressurized container to measure the liquid level of the liquid environmentally friendly insulating medium in the pressurized container and detect the remaining volume of the environmentally friendly insulating medium in the container.

[0010] The oil bath heating pipeline includes: a shell, a metal gas pipeline, a base heater and a temperature control module. The metal gas pipeline is arranged inside the shell. The metal gas pipeline is slender and has a multi-ring annular pipeline structure. The shell is filled with heat conduction oil. A base heater is arranged at the bottom of the shell. The temperature control module is connected to the base heater. A first temperature sensor is arranged on the air inlet side of the metal gas pipeline, and a second temperature sensor is arranged on the air outlet side of the metal gas pipeline. The background gas with a set flow rate is heated through the heating pipeline, and enters the next link after reaching a certain high temperature, which can accelerate the gasification of the liquid environmentally friendly insulating medium.

[0011] Further, the mixed gas chamber comprises: a spherical structure, a liquid inlet is arranged at the top of the mixed gas chamber, an air inlet is arranged at the side of the mixed gas chamber, the direction of the air inlet of the mixed gas chamber is tangential to the inner wall, an air outlet is arranged on the opposite side of the air inlet, a plurality of hollow aluminum balls are arranged inside the mixed gas chamber, and an ejector pin is arranged on the inner wall of the mixed gas chamber on the air outlet side;

[0012] When the high-temperature background gas from the heating pipeline rushes in from the air inlet, its gas flow is towards the injection port of the liquid environmentally friendly insulating medium. When the high-temperature background gas encounters the liquid environmentally friendly insulating medium, it will accelerate its vaporization and flow around the inner wall, and drive the hollow aluminum ball to disturb, so as to fully stir the environmentally friendly insulating medium and the background gas, so that they are evenly mixed and output from the outlet to the next link. A pin structure is specially arranged on the inner wall of the spherical structure, which can be used to prevent the hollow aluminum ball from blocking the outlet.

[0013] Furthermore, the gas outlet of the buffer gas chamber is connected to the inlet of the target gas chamber through a compressor, and the buffer gas chamber is used to store the environmentally friendly mixed gas from the mixed gas cavity; the compressor is used to compress the mixed gas in the buffer gas chamber and replenish it into the target gas chamber.

[0014] Further, the invention comprises: a vacuum pump, wherein the vacuum pump is connected to the pressurized container and the buffer gas chamber, and firstly, the pressurized container, the mixed gas chamber, the buffer gas chamber, the target gas chamber and the gas paths connected thereto are evacuated by the vacuum pump to make them as close to a vacuum state as possible, so as to remove impurity gases;

[0015] Secondly, when the air extraction reaches the limit state, let it stand for a while and observe whether there are any changes in the pressure gauges on the pressurized container, buffer air chamber and target air chamber during this period. If there is no change, it means that the air tightness is good. If the pressure gauge shows an upward trend, it means that there is a leak in the container or gas line, which needs to be identified and repaired.

[0016] A method for quickly filling a high liquefaction temperature mixed gas comprises the following steps:

[0017] Step 1: injecting environmentally friendly insulating medium into the pressurized container and filling it with background gas to increase the pressure so that it is 0.5MPa to 1MPa higher than the rated gas pressure of the target gas chamber of the environmentally friendly gas-insulated equipment;

[0018] Step 2: According to the target mixing ratio of the target gas chamber, the environmentally friendly insulating medium is first introduced into the mixed gas cavity, the flow rate of the background gas is controlled according to the flow rate of the environmentally friendly insulating medium, and the preheated background gas is injected into the mixed gas cavity to mix with the environmentally friendly insulating medium, and the temperature of the preheated background gas is 80-100° C. to form a mixed gas;

[0019] Step 3: If the target air chamber is in a vacuum state, the inflation operation is performed, and the mixed gas is directly filled into the target air chamber in a vacuum state, and then the process proceeds to step 5;

[0020] If the target gas chamber is under-gassing, the gas replenishment operation is performed, and the mixed gas is temporarily filled into the buffer gas chamber. After the gas pressure in the buffer gas chamber is higher than the gas pressure in the target gas chamber, the process goes to step 4;

[0021] Step 4: Start the compressor between the buffer gas chamber and the target gas chamber, compress the mixed gas in the buffer gas chamber and add it to the target gas chamber in the under-gas state, and then proceed to step 5;

[0022] Step 5: Stop filling the target air chamber until the pressure filled into the target air chamber is higher than the required rated pressure, and the difference between the two is 5% to 10%. When the temperature of the mixed gas cools down to room temperature and the pressure is stable and unchanged, release a certain amount of mixed gas in the target air chamber to reduce the mixed gas pressure in the target air chamber to the target pressure.

[0023] Further, in step 1: the volume of the environmentally friendly insulating medium injected into the pressurized container is:

[0024]

[0025] Wherein, n is the ratio of environmentally friendly insulating medium to mixed gas (target mixing ratio); P n V is the rated gas pressure required to be filled; 目标气室 is the volume of the target air chamber; M 环保 is the molar mass of the environmentally friendly insulating medium; R is the gas constant (proportional constant); T is the ambient temperature of the target gas chamber; ρ 环保(气) It is the density of the environmentally friendly insulating medium in gaseous state.

[0026] Furthermore, in step 2: the background gas flow rate is specifically:

[0027]

[0028] Among them, v 背景 is the flow rate of the background gas;

[0029] ρ 环保(液) It is the density of environmentally friendly insulating medium in liquid state; v 环保 It is the flow rate of liquid environmentally friendly insulating medium.

[0030] Furthermore, in step 4, the amount of gas added by the mixed gas compression is specifically:

[0031]

[0032] Among them, P 缓冲气室 The gas pressure required to fill the buffer gas chamber (the amount of gas compressed and filled into the mixed gas); P 目标 is the target gas pressure of the target gas chamber of the environmentally friendly gas-insulated equipment; P 当前 V is the current gas pressure of the target gas chamber of the environmentally friendly gas-insulated equipment; 目标气室 is the volume of the target air chamber; V 缓冲气室 is the volume of the buffer chamber.

[0033] Beneficial effect: The present invention is based on the technical improvement of the dynamic gas distribution method. By installing a pressurized container, a heating pipeline, a mixed gas chamber and a buffer gas chamber, etc., the shortcomings of the dynamic gas distribution method, such as slow inflation rate and inability to replenish gas, are compensated, so that it can adapt to the requirements of light weight, small size, mobility and portability required by field applications. It can sustainably and in large quantities provide a mixed gas with a standard ratio for new environmentally friendly gas insulation equipment, realize a uniform mixture of high liquefaction temperature gas and buffer background gas, solve the filling and replenishment needs of environmentally friendly gas insulation equipment using high liquefaction temperature insulating medium during the commissioning and operation and maintenance process, improve the inflation efficiency, and also realize the gas replenishment needs during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of the device;

[0035] Figure 2 This is a schematic diagram of the process of this device;

[0036] Figure 3 This is the saturated vapor pressure curve of the environmentally friendly gas insulating medium;

[0037] Figure 4 This is a schematic diagram of the heating pipeline structure of the device;

[0038] Figure 5 This is a schematic diagram of the structure of the mixed air chamber of this device. DETAILED DESCRIPTION

[0039] The implementation of the technical solution is further described in detail below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0040] The present invention is conceived as follows: Figure 4 As shown, compared with SF6, new environmentally friendly insulating media such as C4F7N, C5F10O and C6F12O have higher liquefaction temperatures, and C5F10O and C6F12O are both liquid at room temperature and need to be mixed with background gas with low liquefaction temperature according to a rated ratio to form a mixed gas to be used as the insulating medium of environmentally friendly gas-insulated equipment;

[0041] The present invention makes technical improvements based on the dynamic gas distribution method. By installing a pressurized container, a heating pipeline, a mixed gas cavity and a buffer gas chamber and other links, the shortcomings of the dynamic gas distribution method, such as slow inflation rate and inability to replenish gas, are compensated, and a mixed gas with a standard ratio is provided for new environmentally friendly gas insulation equipment, thereby achieving uniform mixing of high liquefaction temperature gas and buffer background gas, improving inflation efficiency, and also meeting the gas replenishment needs during operation.

[0042] Embodiment 1: Figures 1 to 3As shown, a high liquefaction temperature mixed gas rapid filling device comprises: a background gas container 1, an environmentally friendly insulating medium container 2, a pressurized container 3 and a mixed gas chamber 17,

[0043] Background gas container 1, used to contain background gas, such as carbon dioxide, nitrogen, dry air, etc., usually in a large-capacity 40L matching high-pressure steel cylinder with a sufficiently high gas pressure;

[0044] The environmentally friendly insulating medium container 2 is used to hold the environmentally friendly insulating medium which is in liquid phase at room temperature; the interior thereof has an anti-corrosion coating, which can be made of silver plating, chrome plating, aluminum alloy and the like, which is used to prevent the container from being corroded on the one hand, and to prevent the inner wall material of the container from reacting with the environmentally friendly insulating medium, so as to deteriorate the insulating medium components and affect the insulating performance on the other hand;

[0045] The air inlet of the pressurized container 3 is connected to the air outlet of the background gas container 1, the liquid inlet of the pressurized container 3 is connected to the liquid outlet of the environmentally friendly insulating medium container 2, the air outlet of the pressurized container 3 is connected to the vacuum air pump, the liquid outlet of the pressurized container 3 is connected to the liquid inlet of the mixed gas chamber 17, the air outlet of the background gas container 1 is connected to the air inlet of the mixed gas chamber 17, the mixed outlet of the mixed gas chamber 17 is connected to the air inlet of the buffer gas chamber 18, and the mixed outlet of the mixed gas chamber 17 and the air outlet of the buffer gas chamber 18 are both used to connect to the target gas chamber 20;

[0046] The vacuum pump 4 is connected to the pressurized container 3 and the buffer gas chamber 18, and the vacuum pump 4 has an exhaust pipe connected to the pressurized container 3 to evacuate the air in the pressurized container 3 or the residual gas from the last time.

[0047] The pressurized container 3 , the buffer gas chamber 18 and the target gas chamber 20 are provided with pressure gauges 21 , 22 , 25 respectively for observing the gas pressure inside the pressurized container 3 , the buffer gas chamber 18 and the target gas chamber 20 .

[0048] The bottom of the pressurized container 3 is arc-shaped and funnel-shaped. The pressurized container 3 is arranged at the lower side of the environmentally friendly insulating medium container 2. Under the action of gravity, the liquid environmentally friendly insulating medium in the environmentally friendly insulating medium container 2 will gather at the bottom of the pressurized container 3.

[0049] A gas mass flow meter 15 and an oil bath heating pipeline 5 are arranged between the background gas container 1 and the mixed gas chamber 17. The gas mass flow meter 15 has a large range and is used to measure the instantaneous flow rate and the cumulative flow rate of the background gas. The flow rate of the background gas from the background gas container 1 is controlled by the large range of gas mass flow rate.

[0050] A liquid mass flow meter 16 is provided between the pressurized container 3 and the mixed gas chamber 17. The liquid mass flow meter 16 has a micro-range and is used to measure the instantaneous flow and cumulative flow of the environmentally friendly insulating medium. It has communication input and output functions and is used to monitor the flow output ratio in real time.

[0051] A liquid level sensor 23 is provided in the pressurized container 3 for measuring the liquid level of the liquid environmentally friendly insulating medium in the pressurized container 3 and detecting the remaining volume of the environmentally friendly insulating medium in the container.

[0052] A pressure reducing valve 6 is provided at the gas outlet of the background gas container 1, a first valve 7 is provided between the gas mass flowmeter 15 and the pressure reducing valve 6, a second valve 8 is provided between the vacuum pump 4 and the buffer gas chamber 18, a third valve 9 is provided between the gas inlet of the pressurized container 3, a fourth valve 10 is provided between the environmentally friendly insulating medium container 2 and the pressurized container 3, a fifth valve 11 is provided between the pressurized container 3 and the liquid mass flowmeter 16, a sixth valve 12 is provided between the mixed gas chamber 17 and the target gas chamber 20, a seventh valve 13 is provided between the vacuum pump 4 and the pressurized container 3, an eighth valve 14 is provided between the mixed gas chamber 17 and the buffer gas chamber 18, and a ninth valve 24 is provided between the buffer gas chamber 18 and the target gas chamber 20.

[0053] When the buffer air chamber is in the inflation process, the intake valve (eighth valve 14) is in a closed state and the sixth valve 12 is in an open state. When the air replenishment process is in progress, the intake valve (eighth valve 14) is in an open state and the sixth valve 12 is in a closed state, which is used to store the mixed gas from the mixing gas chamber.

[0054] The liquid environmentally friendly insulating medium pressurization output link composed of the background gas container 1, the environmentally friendly insulating medium container 2, the boosting container 3, the vacuum pump 4, etc. first evacuates the boosting container 3 by the vacuum pump 4, and then injects the liquid environmentally friendly insulating medium in the environmentally friendly insulating medium container 2, and then introduces the high-pressure background gas in the background gas container 1 that is in the gas phase at room temperature, so that the liquid environmentally friendly insulating medium has sufficient pressure to pass into the liquid mass flowmeter 16, and enters the next link after flow rate control and flow measurement.

[0055] The oil bath heating pipeline 5 includes: a shell 51, a metal gas pipeline 52, a base heater 53 and a temperature control module. The metal gas pipeline 52 is arranged inside the shell. The metal gas pipeline 52 is slender and has a multi-ring annular pipeline structure. The shell is filled with heat conduction oil 54. The base heater 53 is arranged at the bottom of the shell. The temperature control module is connected to the base heater 53. A first temperature sensor 57 is arranged on the air inlet end 55 side of the metal gas pipeline 52, and a second temperature sensor 58 is arranged on the air outlet end 56 side of the metal gas pipeline. The background gas with a set flow rate is heated through the heating pipeline 5, and enters the next link after reaching a certain high temperature, which can accelerate the gasification of the liquid environmentally friendly insulating medium.

[0056] The heat transfer oil has the advantages of uniform heating, accurate temperature control, high temperature under low vapor pressure, and good heat transfer effect; the air inlet end receives background gas from the gas mass flow, and the annular pipe is used to increase the heating area and time of the circulating background gas so that it is fully heated, and the heated background gas is transported to the mixed gas chamber 17 through the air outlet pipe; the base heater heats the oil as a whole, and the first temperature sensor at the air inlet end and the second temperature sensor at the air outlet end feed back the temperatures of the air inlet end and the air outlet end to the temperature control module, and the temperature control module then controls the power of the base heater through the proportional-integral-differential link to keep it at an appropriate temperature and ensure that the air outlet temperature is the required set value;

[0057] The gaseous background gas heating output link, which is composed of the background gas container 1, the gas mass flowmeter 15, the oil bath heating tube, etc., controls the flow rate of the background gas from the background gas container 1 through the large-range gas mass flowmeter 15. The background gas with a set flow rate is heated through the heating pipeline 5, and enters the next link after reaching a certain high temperature, which can accelerate the gasification of the liquid environmentally friendly insulating medium.

[0058] The mixed gas chamber 17 comprises: a spherical structure, the inner surface of the mixed gas chamber 17 should be made of silver or alumina, a liquid inlet is arranged at the top of the mixed gas chamber 17, an air inlet is arranged at the side of the mixed gas chamber 17, the direction of the air inlet of the mixed gas chamber 17 is tangential to the inner wall, and an air outlet is arranged on the opposite side of the air inlet, and correspondingly, a delivery pipeline nozzle 171 from the environmentally friendly insulating medium container 2 is located at the upper part of the mixed gas chamber 17, and a delivery pipeline nozzle from the background gas container 1 is located at the side of the mixed gas chamber 17 and the nozzle outlet is tangential to the inner wall, and the mixed gas outlet is located on the opposite side of the nozzle of the background gas; a plurality of hollow aluminum balls 172 are arranged inside the mixed gas chamber 17, and an ejector pin 173 is arranged on the inner wall of the mixed gas chamber 17 on the air outlet side;

[0059] The mixed gas chamber 17 and the like constitute a liquid environmentally friendly mixed gas rapid mixing and inflation output link; when the high-temperature background gas from the heating pipeline 5 rushes in from the air inlet, its gas flow is in the direction of the liquid environmentally friendly insulating medium injection port. When the high-temperature background gas encounters the liquid environmentally friendly insulating medium, it will accelerate its gasification, and flow around the inner wall with it, and drive the hollow aluminum ball to disturb, so as to fully stir the environmentally friendly insulating medium and the background gas, so that they are evenly mixed and output from the outlet to the next link. A pin structure is specially arranged on the inner wall of the spherical structure, which can be used to prevent the hollow aluminum ball from blocking the outlet.

[0060] The gas outlet of the buffer gas chamber 18 is connected to the inlet of the target gas chamber 20 through the compressor 19 . The buffer gas chamber 18 is used to store the environmentally friendly mixed gas from the mixed gas chamber 17 . The compressor 19 is used to compress the mixed gas in the buffer gas chamber 18 and add it to the target gas chamber 20 .

[0061] Embodiment 2:

[0062] Filling operation: The background gas with low liquefaction temperature, gaseous at room temperature and certain insulation strength and the environmentally friendly insulating medium with high liquefaction temperature and liquid at room temperature are filled into the pressurized container together, and the environmentally friendly insulating medium is pressurized by the background gas so that it has sufficient pressure to enter the mixed gas chamber of the next link and maintain a sufficient flow rate; the background gas passes through a heating pipeline, and after the temperature is increased, it enters the mixed gas chamber of the next link, where it is evenly mixed with the environmentally friendly insulating medium to produce a rated proportion of environmentally friendly mixed gas, which is quickly filled into the environmentally friendly gas insulation equipment in the target gas chamber in a vacuum state and reaches the rated gas pressure.

[0063] like Figure 5 As shown, a method for quickly filling a high liquefaction temperature mixed gas comprises the following steps:

[0064] Step 1: Vacuuming the gas chamber and gas path: Use a vacuum pump to evacuate the target gas chamber of the booster container, the mixed gas chamber, the buffer gas chamber, the environmentally friendly gas insulation equipment, and the gas paths connected to each other to make them as close to a vacuum state as possible to remove impurity gases;

[0065] Step 2: Check the air tightness of the gas circuit: When the air is pumped to the limit state, let it stand for a while, and observe whether there are changes in the pressure gauges on the booster container, buffer gas chamber and target gas chamber during this period. If there is no change, it means that the air tightness is good. If the pressure gauge shows an upward trend, it means that there is a leak in the container or gas circuit, which needs to be found out. After treatment and repair, start again from step 1;

[0066] Step 3: Inject gaseous background gas for gas washing: Open the pressure reducing valve of the background gas container, set the control flow rate of the gas mass flow meter, and fully clean the gas path and gas chamber in the rear section through continuous ventilation to remove impurities and ensure the purity of the prepared environmentally friendly mixed gas;

[0067] Step 4: Inject liquid environmentally friendly insulating medium: According to the volume V and rated gas pressure P of the target gas chamber of the environmentally friendly gas-insulated equipment n , the rated ratio n of the environmentally friendly mixed gas and other parameters, roughly calculate the volume V required for the environmentally friendly insulating medium 环保 and inject it into a pressurized container under a vacuum state, and obtain the liquid level of the injected liquid environmentally friendly insulating medium through a liquid level sensor;

[0068] The volume of environmentally friendly insulating medium injected into the pressurized container under vacuum is:

[0069]

[0070] Where n is the ratio of environmentally friendly insulating medium to mixed gas; P n is the rated gas pressure required to be filled, in Pa; V 目标气室 is the volume of the target air chamber, in m 3 ;M 环保 is the molar mass of the environmentally friendly insulating medium; R is the gas constant (proportional constant); T is the ambient temperature of the target gas chamber, in K; ρ 环保(气) It is the density of environmentally friendly insulating medium in gaseous state, in kg / m 3 ;

[0071] Step 5: Inject background gas to increase pressure: Fill the pressurized container that has been injected with the environmentally friendly insulating medium with background gas, read the reading on the barometer, and make it 0.5MPa to 1MPa higher than the rated pressure of the target gas chamber of the environmentally friendly gas insulation equipment, to ensure that the liquid environmentally friendly insulating medium in the pressurized container has sufficient pressure to pass into the liquid mass flowmeter and enter the next step;

[0072] Step 6: Preheat the heating pipeline: Set the control temperature of the heating pipeline to ensure that the background gas entering the mixed gas chamber has a sufficient temperature (80-100°C), and when the flow rate of the background gas is stable, the flow rate and the heating power are balanced;

[0073] Step 7: Filling the target gas chamber: According to the target mixing ratio of the environmentally friendly gas insulation equipment, the flow rate of the liquid environmentally friendly insulating medium is controlled by the liquid mass flow meter. After the output remains stable, the flow rate of the background gas is controlled by the gas mass flow meter, so that the liquid environmentally friendly insulating medium and the background gas are mixed in the mixed gas cavity and filled into the target gas chamber;

[0074] The flow rate of the background gas is:

[0075]

[0076] Among them, v 背景 is the flow rate of background gas, in L / min;

[0077] ρ 环保(液) It is the density of environmentally friendly insulating medium in liquid state, in kg / m 3 ;v 环保 It is the flow rate of liquid environmentally friendly insulating medium, in L / min;

[0078] The real-time mixed gas ratio and the accumulated mixed gas ratio can be calculated based on the stabilized readings of the gas mass flow meter and the liquid mass flow meter;

[0079]

[0080]

[0081] Among them, n 瞬时 It is the real-time mixed gas ratio;

[0082] n 累计 is the ratio of the accumulated mixed gas;

[0083] V 环保 It is the cumulative flow rate of liquid environmentally friendly insulating medium, in L.

[0084] V 背景 It is the cumulative flow rate of gaseous background gas charged into the environmentally friendly mixed gas, in L.

[0085] Step 8: Fill the target gas chamber: The gas pressure filled into the environmentally friendly gas insulation equipment is 5% higher than the required rated gas pressure. At this time, stop filling and close all valves;

[0086] Step 9: Wait for equilibrium: The mixed gas filled into the environmentally friendly gas-insulated equipment in step 8 has not reached equilibrium. After the temperature cools down, the air pressure will drop to a certain extent. When the air pressure is stable and unchanged within one hour, slowly release a certain amount of mixed gas in the target air chamber to reduce it to the target pressure to complete the inflation process.

[0087] Embodiment three:

[0088] Gas replenishment operation: collect the rated proportion of the environmentally friendly mixed gas generated in function one into the buffer gas chamber, compress it to a pressure higher than the rated pressure through a compressor, and then fill it into the target gas chamber that already has a certain pressure, so as to realize the gas replenishment function after leakage or maintenance of the environmentally friendly gas insulation equipment.

[0089] like Figure 5 As shown, a method for quickly filling a high liquefaction temperature mixed gas comprises the following steps:

[0090] Step 1: Vacuuming the gas chamber and gas path: Use a vacuum pump to evacuate the target gas chamber of the booster container, the mixed gas chamber, the buffer gas chamber, the environmentally friendly gas insulation equipment, and the gas paths connected to each other to make them as close to a vacuum state as possible to remove impurity gases;

[0091] Step 2: Check the air tightness of the gas circuit: When the air is pumped to the limit state, let it stand for a while, and observe whether there are changes in the pressure gauges on the booster container, buffer gas chamber and target gas chamber during this period. If there is no change, it means that the air tightness is good. If the pressure gauge shows an upward trend, it means that there is a leak in the container or gas circuit, which needs to be found out. After treatment and repair, start again from step 1;

[0092] Step 3: Inject gaseous background gas for gas washing: Open the pressure reducing valve of the background gas container, set the control flow rate of the gas mass flow meter, and fully clean the gas path and gas chamber in the rear section through continuous ventilation to remove impurities and ensure the purity of the prepared environmentally friendly mixed gas;

[0093] Step 4: Inject liquid environmentally friendly insulating medium: According to the volume V and rated gas pressure P of the target gas chamber of the environmentally friendly gas-insulated equipment n , the rated ratio n of the environmentally friendly mixed gas and other parameters, roughly calculate the volume V required for the environmentally friendly insulating medium 环保 and inject it into a pressurized container under a vacuum state, and obtain the liquid level of the injected liquid environmentally friendly insulating medium through a liquid level sensor;

[0094] The volume of environmentally friendly insulating medium injected into the pressurized container under vacuum is:

[0095]

[0096] Where n is the ratio of environmentally friendly insulating medium to mixed gas; P n is the rated gas pressure required to be filled, in Pa; V 目标气室 is the volume of the target air chamber, in m 3 ;M 环保 is the molar mass of the environmentally friendly insulating medium; R is the gas constant (proportional constant); T is the ambient temperature of the target gas chamber, in K; ρ 环保(气) It is the density of environmentally friendly insulating medium in gaseous state, in kg / m 3 ;

[0097] Step 5: Inject background gas to increase pressure: Fill the pressurized container that has been injected with the environmentally friendly insulating medium with background gas, read the reading on the barometer, and make it 0.5MPa to 1MPa higher than the rated pressure of the target gas chamber of the environmentally friendly gas insulation equipment, to ensure that the liquid environmentally friendly insulating medium in the pressurized container has sufficient pressure to pass into the liquid mass flowmeter and enter the next step;

[0098] Step 6: Preheat the heating pipeline: Set the control temperature of the heating pipeline to ensure that the background gas entering the mixed gas chamber has a sufficient temperature, and when the flow rate of the background gas is stable, the flow rate and the heating power are balanced;

[0099] Step 7: Filling the buffer gas chamber: According to the target mixing ratio of the environmentally friendly gas insulation equipment, the flow rate of the liquid environmentally friendly insulation medium is controlled by the liquid mass flow meter. After its output remains stable, the flow rate of the background gas is controlled by the gas mass flow meter to allow the liquid environmentally friendly insulation medium and the background gas to mix in the mixed gas cavity. After the mixed gas output remains stable, it is filled into the buffer gas chamber. The amount of gas filled should be greater than the difference between the target gas amount of the environmentally friendly gas insulation equipment and the current gas amount;

[0100] The air pressure required to fill the buffer air chamber is:

[0101]

[0102] in,

[0103] P 目标 The target gas pressure of the target gas chamber of the environmentally friendly gas-insulated equipment, in MPa;

[0104] P 当前 The current gas pressure of the target gas chamber of the environmentally friendly gas-insulated equipment, in MPa;

[0105] V 目标气室 is the volume of the target gas chamber of the environmentally friendly gas-insulated equipment, in L;

[0106] V 缓冲气室 The volume of the buffer chamber, in L;

[0107] Step 8: Filling the target gas chamber: Start the compressor, compress the environmentally friendly mixed gas in the buffer gas chamber and fill it into the target gas chamber of the environmentally friendly gas insulation equipment. After the gas is added, the pressure should be 5% to 10% higher than the required rated pressure. At this time, stop filling and close all valves;

[0108] Step 9: Wait for equilibrium: In step 8, the mixed gas filled into the environmentally friendly gas-insulated equipment has not reached equilibrium. After the temperature cools down, the air pressure will drop to a certain extent. When the air pressure is stable and unchanged within one hour, slowly release the gas in the target air chamber to reduce it to the target pressure to complete the gas replenishment process.

[0109] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high liquefaction temperature mixed gas rapid filling device, characterized in that: include: A background gas container (1), an environmentally friendly insulating medium container (2), a pressurized container (3) and a mixed gas chamber (17), wherein the air inlet of the pressurized container (3) is connected to the air outlet of the background gas container (1), the liquid inlet of the pressurized container (3) is connected to the liquid outlet of the environmentally friendly insulating medium container (2), the air outlet of the pressurized container is connected to a vacuum air pump, the liquid outlet of the pressurized container (3) is connected to the liquid inlet of the mixed gas chamber (17), the air outlet of the background gas container (1) is connected to the air inlet of the mixed gas chamber (17), the mixed outlet of the mixed gas chamber (17) is connected to the air inlet (18) of the buffer gas chamber, and the mixed outlet and The air outlets of the buffer air chamber (18) are used to connect to the target air chamber (20); the bottom of the booster container (3) is arc-shaped and funnel-shaped; the booster container (3) is arranged at the lower side of the environmentally friendly insulating medium container; the mixed air chamber (17) comprises: a spherical structure; a liquid inlet is arranged at the top of the mixed air chamber (17); an air inlet is arranged at the side of the mixed air chamber (17); the direction of the air inlet of the mixed air chamber (17) is tangential to the inner wall; an air outlet is arranged on the opposite side of the air inlet; a plurality of hollow aluminum balls are arranged inside the mixed air chamber (17); and a thimble is arranged on the inner wall of the mixed air chamber (17) on the air outlet side.

2. A high liquefaction temperature mixed gas rapid filling device according to claim 1, characterized in that: A gas mass flow meter (15) and an oil bath heating pipeline (5) are arranged between the background gas container (1) and the mixed gas chamber (17), a liquid mass flow meter (16) is arranged between the booster container (3) and the mixed gas chamber (17), and a liquid level sensor is arranged in the booster container.

3. A high liquefaction temperature mixed gas rapid filling device according to claim 1, characterized in that: The air outlet of the buffer air chamber (18) is connected to the inlet of the target air chamber through a compressor (19).

4. A high liquefaction temperature mixed gas rapid filling device according to claim 1, characterized in that: It comprises a vacuum pump, wherein the vacuum pump is connected to a pressurized container (3) and a buffer gas chamber (18).

5. A method for rapidly filling a high liquefaction temperature mixed gas based on the high liquefaction temperature mixed gas rapid filling device according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: injecting an environmentally friendly insulating medium into the pressurized container and filling it with background gas for pressurization; Step 2: According to the target mixing ratio of the target gas chamber, the environmentally friendly insulating medium is first introduced into the mixed gas cavity, the flow rate of the background gas is controlled according to the flow rate of the environmentally friendly insulating medium, and the preheated background gas is injected into the mixed gas cavity to mix with the environmentally friendly insulating medium to form a mixed gas; Step 3: If the target air chamber is in a vacuum state, the inflation operation is performed, and the mixed gas is directly filled into the target air chamber in a vacuum state, and then the process proceeds to step 5; If the target gas chamber is under-gassing, the gas replenishment operation is performed, and the mixed gas is temporarily filled into the buffer gas chamber. After the gas pressure in the buffer gas chamber is higher than the gas pressure in the target gas chamber, the process goes to step 4; Step 4: Start the compressor between the buffer gas chamber and the target gas chamber, compress the mixed gas in the buffer gas chamber and add it to the target gas chamber in the under-gas state, and then proceed to step 5; Step 5: Stop filling the target gas chamber until the gas pressure is higher than the required rated pressure. When the mixed gas temperature cools down to room temperature and the pressure is stable and unchanged, release a certain amount of mixed gas in the target gas chamber to reduce the mixed gas pressure in the target gas chamber to the target pressure.

6. A method for rapidly charging a high liquefaction temperature mixed gas according to claim 5, characterized in that: In step 1: the volume of the environmentally friendly insulating medium injected into the pressurized container is: Where n is the ratio of environmentally friendly insulating medium to mixed gas; P n V is the rated gas pressure required to be filled; 目标气室 is the volume of the target air chamber; M 环保 is the molar mass of the environmentally friendly insulating medium; R is the gas constant (proportional constant); T is the ambient temperature of the target gas chamber; ρ 环保(气) It is the density of the environmentally friendly insulating medium in gaseous state.

7. A method for rapidly charging a high liquefaction temperature mixed gas according to claim 5, characterized in that: In step 2: the background gas flow rate is specifically: Among them, v 背景 is the flow rate of the background gas; ρ 环保(液) It is the density of environmentally friendly insulating medium in liquid state; v 环保 It is the flow rate of liquid environmentally friendly insulating medium.

8. A method for rapidly charging a high liquefaction temperature mixed gas according to claim 5, characterized in that: In step 4, the amount of gas compressed and charged into the mixed gas is specifically: Among them, Pbuffer gas chamber is the gas pressure that needs to be filled in the buffer gas chamber; Ptarget is the target gas pressure of the target gas chamber of the environmentally friendly gas insulation equipment; Pcurrent is the current gas pressure of the target gas chamber of the environmentally friendly gas insulation equipment; Vtarget gas chamber is the volume of the target gas chamber; Vbuffer gas chamber is the volume of the buffer gas chamber.

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