Large-flow high-pressure nitrogen production and supply integrated automation system and method

Abstract

The invention relates to a gas production and supply system and method, in particular to a high-flow high-pressure nitrogen production and supply integrated automatic system and method, and aims to solve the problems that an existing nitrogen supply method cannot meet the nitrogen consumption in a short test time, cannot perform classified storage and cannot meet different nitrogen requirements of multiple systems. The system comprises a nitrogen production unit and a nitrogen storage and supply unit which are arranged on a main pipeline, the nitrogen production unit comprises a liquid nitrogen storage tank, a liquid nitrogen pump inlet valve, a liquid nitrogen pump inlet discharge valve, a liquid nitrogen pump, a liquid nitrogen pump outlet discharge valve, a liquid nitrogen pump outlet valve, a second vaporizer, a nitrogen heater, a nitrogen filter and a nitrogen stop valve; the nitrogen storage and supply unit comprises a plurality of high-pressure gas cylinders and a plurality of gas cylinder valves, wherein the input ends of the high-pressure gas cylinders are connected with the downstream of the nitrogen stop valve, and the gas cylinder valves are arranged between the high-pressure gas cylinders and the nitrogen stop valve.

Description

Technical Field

[0001] The present invention relates to a gas production and supply system and method, and in particular to a large-flow high-pressure nitrogen production and supply integrated automated system and method. Background Art

[0002] Some existing large-thrust liquid oxygen-kerosene engine test benches need to be tested during the development of liquid rocket engines (hereinafter referred to as "engines"). The tests usually include test preparation, test and post-test processing, etc. The engine needs a large amount of nitrogen supply during these test stages. The functions of test nitrogen usually include providing the boost gas required for propellant (liquid oxygen or kerosene) pressurization, fire-fighting nitrogen, process gas required for engine precooling and blowing during the test, strong blowing process gas required for generator head blowing, high-pressure control gas required for engine valve movement, control gas required for engine cylinder inflation and kerosene valve movement, control gas required for valve movement of each system of the test bench, and various temporary gases, etc. Nitrogen with different functions needs to be supplied in different categories.

[0003] Currently in the field of rocket engine testing, the nitrogen supply method usually adopts the method of real-time nitrogen generation, but this method usually cannot meet the nitrogen consumption in a short period of time during the test, and cannot be classified and stored, and cannot meet the different nitrogen needs of multiple systems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the existing nitrogen supply method cannot meet the nitrogen consumption in a short period of engine test, cannot be classified and stored, and cannot meet the different nitrogen needs of multiple systems, and to provide a large-flow high-pressure nitrogen production and supply integrated automated system and method.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] An integrated automated system for the production and supply of high-flow, high-pressure nitrogen, which is special in that:

[0007] It includes a nitrogen production unit and a nitrogen storage and supply unit;

[0008] The nitrogen production unit comprises a liquid nitrogen storage tank, a liquid nitrogen pump, a second vaporizer, and a nitrogen heater which are sequentially connected through a main pipe; a liquid nitrogen pump inlet discharge valve is provided at the inlet of the liquid nitrogen pump, a liquid nitrogen pump outlet discharge valve is provided at the outlet of the liquid nitrogen pump, and a nitrogen stop valve is provided on the main pipe at the outlet of the nitrogen heater;

[0009] The nitrogen storage and supply unit comprises a plurality of high-pressure gas cylinders whose input ends are sequentially connected to the downstream pipeline of the nitrogen stop valve and a plurality of gas cylinder valves arranged between the high-pressure gas cylinders and the nitrogen stop valve;

[0010] The liquid nitrogen storage tank is provided with three output ends and one input end, a liquid nitrogen pump inlet valve is provided between the first output end of the liquid nitrogen storage tank and the liquid nitrogen pump, and a liquid nitrogen pump outlet valve is provided between the liquid nitrogen pump and the second vaporizer;

[0011] The second output end of the liquid nitrogen storage tank is provided with a first vaporizer, an automatic booster valve for the liquid nitrogen storage tank is provided between the output end of the first vaporizer and the input end of the liquid nitrogen storage tank, and a gas release valve for the liquid nitrogen storage tank is provided at the input end of the liquid nitrogen storage tank; the third output end of the liquid nitrogen storage tank is connected to the inlet pipeline of the liquid nitrogen pump, and the gas return valve of the liquid nitrogen pump is provided on the pipeline between the third output end of the liquid nitrogen storage tank and the liquid nitrogen pump; the liquid nitrogen storage tank is also provided with a liquid nitrogen storage tank pressure and liquid level monitoring sensor for monitoring the internal pressure and liquid level information thereof;

[0012] Sensors for monitoring pressure are provided in front of the outlet discharge valve of the liquid nitrogen pump and in the main pipe between the first high-pressure gas cylinder and the second high-pressure gas cylinder and after the nitrogen stop valve; sensors for monitoring temperature are provided in front of the inlet discharge valve of the liquid nitrogen pump and on the nitrogen heater.

[0013] Furthermore, the number of the high-pressure gas cylinders is four, namely, a first high-pressure gas cylinder, a second high-pressure gas cylinder, a third high-pressure gas cylinder and a fourth high-pressure gas cylinder; the gas cylinder valves include a first high-pressure gas cylinder charging valve, a second high-pressure gas cylinder charging valve, a third high-pressure gas cylinder charging valve and a first high-pressure gas cylinder charging valve, which are respectively arranged between the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder and the nitrogen shut-off valve;

[0014] Sensors for monitoring pressure are arranged behind the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve and the first charging valve of the fourth high-pressure gas cylinder.

[0015] Furthermore, the pressure sensors after the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve and the first charging valve of the fourth high-pressure gas cylinder, and before the liquid nitrogen pump outlet discharge valve and after the nitrogen shut-off valve are respectively the first high-pressure gas cylinder pressure monitoring sensor, the second high-pressure gas cylinder pressure monitoring sensor, the third high-pressure gas cylinder pressure monitoring sensor, the fourth high-pressure gas cylinder pressure monitoring sensor, the liquid nitrogen pump outlet pressure monitoring sensor and the nitrogen charging pipeline pressure monitoring sensor; the temperature sensors before the valve of the liquid nitrogen pump inlet discharge valve and on the nitrogen heater are respectively the liquid nitrogen pump inlet temperature monitoring sensor and the nitrogen heater temperature monitoring sensor.

[0016] Furthermore, the liquid nitrogen storage tank, the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder are each provided with a main board, the main board is provided with a memory for storing pressure, temperature and liquid level information in the container and a wireless communication module, the outer walls of the liquid nitrogen storage tank, the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder are each provided with a QR code that can be scanned by a terminal device, the QR code is used to store ID information of the corresponding container; the wireless communication module is used to push the pressure, temperature and liquid level information in the container stored in the memory to the terminal device when the operator scans the QR code.

[0017] Furthermore, a fourth high-pressure gas cylinder regulating valve and a fourth high-pressure gas cylinder second charging valve are sequentially arranged in front of the first charging valve of the fourth high-pressure gas cylinder;

[0018] The volume of the liquid nitrogen storage tank is 30m 3 ; The main pipe is made of stainless steel;

[0019] A nitrogen filter is arranged between the nitrogen heater temperature monitoring sensor and the nitrogen stop valve.

[0020] Furthermore, the liquid nitrogen pump inlet discharge valve, the liquid nitrogen pump inlet valve, the liquid nitrogen pump outlet discharge valve, the liquid nitrogen pump outlet valve, the nitrogen stop valve, the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve, the fourth high-pressure gas cylinder second charging valve, the liquid nitrogen pump return valve, the liquid nitrogen storage tank automatic boosting valve and the liquid nitrogen storage tank deflation valve are all electric control valves.

[0021] At the same time, the present invention also provides a method for integrating the production and supply of high-flow high-pressure nitrogen gas. Based on the above-mentioned integrated automation system for the production and supply of high-flow high-pressure nitrogen gas, the method is special in that it includes the following steps:

[0022] Step 1, filling a preset amount of liquid nitrogen into a liquid nitrogen storage tank;

[0023] Step 2: Set the first preset temperature value, the second preset temperature value, the third preset temperature value, the first preset pressure value, the second preset pressure value, and the minimum pressure P of the liquid nitrogen storage tank. x and the maximum pressure of the liquid nitrogen tank P y , and then start the large-flow high-pressure nitrogen production and supply integrated automation system;

[0024] Step 3: Use the liquid nitrogen storage tank pressure and liquid level monitoring sensor to monitor the pressure P0 and liquid level status information of the liquid nitrogen in the liquid nitrogen storage tank in real time. x When the liquid nitrogen storage tank vent valve is closed and the automatic booster valve of the liquid nitrogen storage tank is opened, part of the nitrogen is vaporized through the first vaporizer, causing P0 to increase until P0 ≥ Py , close the automatic pressure boosting valve of the liquid nitrogen storage tank;

[0025] Step 4, open the liquid nitrogen pump inlet valve, the liquid nitrogen pump return valve and the liquid nitrogen pump inlet discharge valve, and monitor the valve front temperature of the liquid nitrogen pump inlet discharge valve, pre-cool the liquid nitrogen pump and the pipeline between the liquid nitrogen pump and the liquid nitrogen storage tank, and when the valve front temperature of the liquid nitrogen pump inlet discharge valve reaches the first preset temperature value, close the liquid nitrogen pump inlet discharge valve, and the pre-cooling of the liquid nitrogen pump and the pipeline between the liquid nitrogen pump and the liquid nitrogen storage tank is completed by default;

[0026] Step 5, open the liquid nitrogen pump outlet valve and the liquid nitrogen pump;

[0027] Step 6, turning on the vaporizer, the liquid nitrogen is pressurized by the liquid nitrogen pump and flows into the vaporizer first, and then into the nitrogen heater, while monitoring the temperature T0 in the nitrogen heater, if T0 is lower than the second preset temperature value, the nitrogen heater is started, if T0 is greater than or equal to the third preset temperature value, the nitrogen heater is turned off;

[0028] Step 7, open the nitrogen stop valve, start supplying nitrogen, and monitor the pressure P1 before the liquid nitrogen pump outlet discharge valve and the pressure P2 after the nitrogen stop valve at the same time. When P1=the first preset pressure value, turn off the liquid nitrogen pump; when P2=the second preset pressure value, close the nitrogen stop valve, then turn off the vaporizer and open the liquid nitrogen pump outlet discharge valve to discharge the remaining nitrogen, and finally close the liquid nitrogen pump inlet valve and the liquid nitrogen pump outlet valve;

[0029] Step 8. Several high-pressure gas cylinders begin to balance the nitrogen pressure and deliver nitrogen to the target device. The nitrogen delivery method is ordinary supply or constant pressure supply. During the nitrogen delivery process, the nitrogen pressure in each high-pressure gas cylinder is maintained to meet the preset demand pressure, thereby realizing the automated production and supply of large-flow high-pressure nitrogen.

[0030] Furthermore, when the nitrogen is delivered by ordinary supply, step 8 is specifically as follows:

[0031] Step 8.1, open the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve and the fourth high-pressure gas cylinder second charging valve, and simultaneously monitor the valve back pressures of the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve and the fourth high-pressure gas cylinder first charging valve, which are P3, P4, P5 and P6 respectively; set the preset nitrogen collection amounts of the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder, which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount respectively; set the first critical pressure value, the second critical pressure value and the third critical pressure;

[0032] Step 8.2, the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder start to collect nitrogen. When the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder reach their respective preset nitrogen collection amounts, close the corresponding first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, or the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve and the fourth high-pressure gas cylinder second charging valve;

[0033] Step 8.3, after the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, the first charging valve of the fourth high-pressure gas cylinder, the fourth high-pressure gas cylinder regulating valve and the second charging valve of the fourth high-pressure gas cylinder are all closed, the first high-pressure gas cylinder starts to transport nitrogen to the target device;

[0034] Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P4. If P4 is greater than or equal to the second critical pressure value, open the first high-pressure gas cylinder charging valve and the second high-pressure gas cylinder charging valve to allow the nitrogen in the second high-pressure gas cylinder to flow into the first high-pressure gas cylinder until P3 is greater than the first critical pressure value, and then close the first high-pressure gas cylinder charging valve and the second high-pressure gas cylinder charging valve; if P4 is less than or equal to the second critical pressure value, execute step 8.5;

[0035] Step 8.5, determine the value of P5. If P5 is greater than or equal to the third critical pressure, open the first high-pressure gas cylinder charging valve and the third high-pressure gas cylinder charging valve to allow the nitrogen in the third high-pressure gas cylinder to flow into the first high-pressure gas cylinder until P3 is greater than the first critical pressure value, and then; if P5 is less than or equal to the third critical pressure, restart the large-flow high-pressure nitrogen production and supply integrated automation system, return to step 3, until P3, P4, and P5 are respectively greater than the corresponding critical pressure values, to achieve automated production and supply of large-flow high-pressure nitrogen.

[0036] Furthermore, when the nitrogen is delivered at a constant pressure, step 8 is specifically as follows:

[0037] Step 8.1, open the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve and the fourth high-pressure gas cylinder second charging valve, and simultaneously monitor the valve back pressures of the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve and the fourth high-pressure gas cylinder first charging valve, which are P3, P4, P5 and P6 respectively; set the preset nitrogen collection amounts of the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder, which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount respectively; set the first critical pressure value and the fourth critical pressure value;

[0038] Step 8.2, the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder start to collect nitrogen. When the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder reach their respective preset nitrogen collection amounts, close the corresponding first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, or the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve and the fourth high-pressure gas cylinder second charging valve;

[0039] Step 8.3, after the first high-pressure gas cylinder charging valve, the second high-pressure gas cylinder charging valve, the third high-pressure gas cylinder charging valve, the first charging valve of the fourth high-pressure gas cylinder, the fourth high-pressure gas cylinder regulating valve and the second charging valve of the fourth high-pressure gas cylinder are all closed, the first high-pressure gas cylinder starts to transport nitrogen to the target device;

[0040] Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P6. If P6 is greater than or equal to the fourth critical pressure value, open the first high-pressure gas cylinder charging valve, the fourth high-pressure gas cylinder first charging valve, the fourth high-pressure gas cylinder regulating valve and the fourth high-pressure gas cylinder second charging valve to allow the nitrogen in the fourth high-pressure gas cylinder to flow into the first high-pressure gas cylinder at a constant pressure until P3 is greater than the first critical pressure value; if P6 is less than or equal to the fourth critical pressure value, restart the large-flow high-pressure nitrogen production and supply integrated automation system, and return to step 3 until P3 and P6 are respectively greater than the corresponding critical pressure values ​​to achieve automated production and supply of large-flow high-pressure nitrogen.

[0041] Further, in step 3, the P x =0.15MPa, P y =0.3MPa;

[0042] In step 4, the first preset temperature value is -180°C;

[0043] In step 6, the second preset temperature value is -40°C, and the third preset temperature value is 20°C.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The large-flow high-pressure nitrogen production and supply integrated automation system provided by the present invention can produce nitrogen quantitatively and automatically according to the test requirements, and is provided with multiple temperature sensors and pressure sensors, which can realize remote warning of overpressure; the system can realize the zoned and pressure-controlled storage and supply of nitrogen, use nitrogen more efficiently and reasonably, and can meet the different nitrogen requirements of multiple systems;

[0046] 2. The integrated automated system for producing and supplying high-pressure nitrogen with large flow rate provided by the present invention includes a plurality of high-pressure gas cylinders for classified storage of nitrogen. Each valve in the system realizes intelligent remote control to achieve human-machine isolation, which can improve the safety of the system. Through pressure closed-loop monitoring and automatic valve adjustment, the various functional gases output by the high-pressure gas cylinders can be automatically adjusted to each other, and finally a stable gas supply can be achieved during the engine test run.

[0047] 3. The large-flow high-pressure nitrogen production and supply integrated automation system provided by the present invention can enable operators to view the pressure, temperature and liquid level data information in the liquid nitrogen storage tank, the first high-pressure gas cylinder, the second high-pressure gas cylinder, the third high-pressure gas cylinder and the fourth high-pressure gas cylinder at any time and anywhere through the Internet of Things, thereby increasing safety and scalability;

[0048] 4. The integrated automated method for the production and supply of high-flow high-pressure nitrogen provided by the present invention can realize unattended, fully automated production, supply and utilization of nitrogen, making the rocket engine test process more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a structural schematic diagram of an embodiment of a large-flow high-pressure nitrogen production and supply integrated automation system of the present invention;

[0050] Description of reference numerals:

[0051] 1-Liquid nitrogen storage tank vent valve, 2-Liquid nitrogen storage tank automatic booster valve, 3-First vaporizer, 4-Liquid nitrogen storage tank, 5-Liquid nitrogen storage tank pressure and liquid level monitoring sensor, 6-Liquid nitrogen pump inlet valve, 7-Liquid nitrogen pump return valve, 8-Liquid nitrogen pump inlet discharge valve, 9-Liquid nitrogen pump inlet temperature monitoring sensor, 10-Liquid nitrogen pump, 11-Liquid nitrogen pump outlet discharge valve, 12-Liquid nitrogen pump outlet pressure monitoring sensor, 13-Liquid nitrogen pump outlet valve, 14-Second vaporizer, 15-Nitrogen heater temperature monitoring sensor, 16-Nitrogen heater, 17-Nitrogen filter, 18-Nitrogen stop valve, 19-Nitrogen charging pipeline Pressure monitoring sensor, 20-first high-pressure gas cylinder charging valve, 21-first high-pressure gas cylinder pressure monitoring sensor, 22-first high-pressure gas cylinder, 23-second high-pressure gas cylinder, 24-second high-pressure gas cylinder pressure monitoring sensor, 25-second high-pressure gas cylinder charging valve, 26-third high-pressure gas cylinder charging valve, 27-third high-pressure gas cylinder pressure monitoring sensor, 28-third high-pressure gas cylinder, 29-fourth high-pressure gas cylinder, 30-fourth high-pressure gas cylinder pressure monitoring sensor, 31-fourth high-pressure gas cylinder first charging valve, 32-fourth high-pressure gas cylinder regulating valve, 33-fourth high-pressure gas cylinder second charging valve, 34-main line. DETAILED DESCRIPTION

[0052] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] An integrated automated system for the production and supply of high-flow, high-pressure nitrogen, see Figure 1 ;

[0054] It includes a nitrogen production unit and a nitrogen storage and supply unit arranged on a main pipeline 34 made of stainless steel;

[0055] The nitrogen production unit includes 30m 3 Liquid nitrogen storage tank 4, liquid nitrogen pump 10, second vaporizer 14, nitrogen heater 16; the inlet of liquid nitrogen pump 10 is provided with liquid nitrogen pump inlet discharge valve 8, the outlet of liquid nitrogen pump 10 is provided with liquid nitrogen pump outlet discharge valve 11, and the main pipe 34 of the outlet of nitrogen heater 16 is provided with nitrogen stop valve 18;

[0056] The nitrogen storage and supply unit includes four high-pressure gas cylinders whose input ends are sequentially connected to the downstream pipeline of the nitrogen stop valve 18, namely the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29, and a plurality of gas cylinder valves arranged between the high-pressure gas cylinders and the nitrogen stop valve 18; the gas cylinder valves include the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26 and the fourth high-pressure gas cylinder first charging valve 31 which are respectively arranged between the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 and the nitrogen stop valve 18; sensors for monitoring pressure are arranged behind the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26 and the fourth high-pressure gas cylinder first charging valve 31.

[0057] The liquid nitrogen storage tank 4 is provided with three output ends and one input end, a liquid nitrogen pump inlet valve 6 is provided between the first output end of the liquid nitrogen storage tank 4 and the liquid nitrogen pump 10, and a liquid nitrogen pump outlet valve 13 is provided between the liquid nitrogen pump 10 and the second vaporizer 14;

[0058] The second output end of the liquid nitrogen storage tank 4 is provided with a first vaporizer 3, a liquid nitrogen storage tank automatic booster valve 2 is provided between the output end of the first vaporizer 3 and the input end of the liquid nitrogen storage tank 4, and a liquid nitrogen storage tank air release valve 1 is provided at the input end of the liquid nitrogen storage tank 4; the third output end of the liquid nitrogen storage tank 4 is connected to the inlet pipeline of the liquid nitrogen pump 10, and the liquid nitrogen pump return valve 7 is provided on the pipeline between the third output end of the liquid nitrogen storage tank 4 and the liquid nitrogen pump 10; the liquid nitrogen storage tank 4 is also provided with a liquid nitrogen storage tank pressure and liquid level monitoring sensor 5 for monitoring the internal pressure and liquid level information thereof;

[0059] A fourth high-pressure gas cylinder regulating valve 32 and a fourth high-pressure gas cylinder second charging valve 33 are sequentially arranged in front of the first charging valve 31 of the fourth high-pressure gas cylinder;

[0060] Sensors for monitoring pressure are provided before the valve of the discharge valve 11 at the outlet of the liquid nitrogen pump and after the valve of the nitrogen stop valve 18 on the main pipeline 34 between the first high-pressure gas cylinder and the second high-pressure gas cylinder; sensors for monitoring temperature are provided before the valve of the discharge valve 8 at the inlet of the liquid nitrogen pump and on the nitrogen heater 16. The pressure sensors after the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26 and the first charging valve 31 of the fourth high-pressure gas cylinder, and before the discharge valve 11 at the outlet of the liquid nitrogen pump and after the nitrogen stop valve 18 are the first high-pressure gas cylinder pressure monitoring sensor 21, the second high-pressure gas cylinder pressure monitoring sensor 24, the third high-pressure gas cylinder pressure monitoring sensor 27, the fourth high-pressure gas cylinder pressure monitoring sensor 30, the liquid nitrogen pump outlet pressure monitoring sensor 12 and the nitrogen charging pipeline pressure monitoring sensor 19; the temperature sensors before the valve of the discharge valve 8 at the inlet of the liquid nitrogen pump and on the nitrogen heater 16 are the liquid nitrogen pump inlet temperature monitoring sensor 9 and the nitrogen heater temperature monitoring sensor 15.

[0061] In order to facilitate the operator to obtain status information, a main board is provided in the liquid nitrogen storage tank 4, the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29, and a memory and a wireless communication module are provided on the main board for storing the pressure, temperature and liquid level information in the container. The outer walls of the liquid nitrogen storage tank 4, the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 are provided with a QR code that can be scanned by the terminal device, and the QR code is used to store the ID information of the corresponding container; the wireless communication module is used to push the pressure, temperature and liquid level information in the container stored in the memory to the terminal device when the operator scans the QR code.

[0062] The liquid nitrogen pump inlet discharge valve 8, the liquid nitrogen pump inlet valve 6, the liquid nitrogen pump outlet discharge valve 11, the liquid nitrogen pump outlet valve 13, the nitrogen stop valve 18, the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32, the fourth high-pressure gas cylinder second charging valve 33, the liquid nitrogen pump return valve 7, the liquid nitrogen storage tank automatic booster valve 2 and the liquid nitrogen storage tank deflation valve 1 are all electric control valves.

[0063] In order to increase the purity of nitrogen, a nitrogen filter 17 is provided between the nitrogen heater temperature monitoring sensor 15 and the nitrogen shut-off valve 18 .

[0064] At the same time, this embodiment also provides a large-flow high-pressure nitrogen production and supply integrated automation method, based on the above-mentioned large-flow high-pressure nitrogen production and supply integrated automation system, including the following steps:

[0065] Step 1, filling a preset amount of liquid nitrogen into the liquid nitrogen storage tank 4;

[0066] Step 2: Set the first preset temperature value, the second preset temperature value, the third preset temperature value, the first preset pressure value, the second preset pressure value, and the minimum pressure P of the liquid nitrogen storage tank. x =0.15MPa and the maximum pressure of the liquid nitrogen storage tank P y =0.3MPa, and then start the large-flow high-pressure nitrogen production and supply integrated automation system;

[0067] Step 3: Use the liquid nitrogen storage tank pressure and liquid level monitoring sensor 5 to monitor the pressure P0 and liquid level status information of the liquid nitrogen in the liquid nitrogen storage tank 4 in real time. x When the liquid nitrogen storage tank vent valve 1 is closed and the liquid nitrogen storage tank automatic pressure boosting valve 2 is opened, part of the nitrogen is vaporized through the first vaporizer 3, causing P0 to increase until P0 ≥ P y , close the automatic booster valve 2 of the liquid nitrogen storage tank;

[0068] Step 4, open the liquid nitrogen pump inlet valve 6, the liquid nitrogen pump return valve 7 and the liquid nitrogen pump inlet discharge valve 8, and monitor the valve front temperature of the liquid nitrogen pump inlet discharge valve 8, pre-cool the liquid nitrogen pump 10 and the pipeline between the liquid nitrogen pump 10 and the liquid nitrogen storage tank 4, and when the valve front temperature of the liquid nitrogen pump inlet discharge valve 8 reaches the first preset temperature value -180°C, close the liquid nitrogen pump inlet discharge valve 8, and the pre-cooling of the liquid nitrogen pump 10 and the pipeline between the liquid nitrogen pump 10 and the liquid nitrogen storage tank 4 is completed by default;

[0069] Step 5, opening the liquid nitrogen pump outlet valve 13 and the liquid nitrogen pump 10;

[0070] Step 6, the vaporizer 14 is turned on, and the liquid nitrogen is pressurized by the liquid nitrogen pump 10 and flows into the vaporizer 14 first, and then enters the nitrogen heater 16, and the temperature T0 in the nitrogen heater 16 is monitored at the same time. If T0 is lower than the second preset temperature value -40°C, the nitrogen heater 16 is started, and if T0 is greater than or equal to the third preset temperature value 20°C, the nitrogen heater 16 is turned off;

[0071] Step 7, open the nitrogen stop valve 18, start supplying nitrogen, and monitor the valve pressure P1 before the liquid nitrogen pump outlet discharge valve 11 and the valve pressure P2 after the nitrogen stop valve 18 at the same time. When P1=the first preset pressure value, close the liquid nitrogen pump 10; when P2=the second preset pressure value, close the nitrogen stop valve 18, then close the vaporizer 14 and open the liquid nitrogen pump outlet discharge valve 11 to discharge the remaining nitrogen, and finally close the liquid nitrogen pump inlet valve 6 and the liquid nitrogen pump outlet valve 13;

[0072] If the normal nitrogen supply method is adopted, step 8 is as follows:

[0073] Step 8.1, open the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33, and monitor the valve back pressures of the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26 and the fourth high-pressure gas cylinder first charging valve 31, which are P3, P4, P5 and P6 respectively; set the preset nitrogen collection amounts of the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29, which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount respectively; set the first critical pressure value, the second critical pressure value and the third critical pressure;

[0074] Step 8.2, the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 start to collect nitrogen. When the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 reach their respective preset nitrogen collection amounts, close the corresponding first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, or the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33;

[0075] Step 8.3, after the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33 are all closed, the first high-pressure gas cylinder 22 starts to deliver nitrogen to the target device;

[0076] Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P4. If P4 is greater than or equal to the second critical pressure value, open the first high-pressure gas cylinder charging valve 20 and the second high-pressure gas cylinder charging valve 25 to allow the nitrogen in the second high-pressure gas cylinder 23 to flow into the first high-pressure gas cylinder 22 until P3 is greater than the first critical pressure value, and then close the first high-pressure gas cylinder charging valve 20 and the second high-pressure gas cylinder charging valve 25; if P4 is less than or equal to the second critical pressure value, execute step 8.5;

[0077] Step 8.5, determine the value of P5. If P5 is greater than or equal to the third critical pressure, open the first high-pressure gas cylinder charging valve 20 and the third high-pressure gas cylinder charging valve 26 to allow the nitrogen in the third high-pressure gas cylinder 28 to flow into the first high-pressure gas cylinder 22 until P3 is greater than the first critical pressure value, and then; if P5 is less than or equal to the third critical pressure, restart the large-flow high-pressure nitrogen production and supply integrated automation system, return to step 3, until P3, P4, and P5 are respectively greater than the corresponding critical pressure values, to achieve automated production and supply of large-flow high-pressure nitrogen.

[0078] If the constant pressure nitrogen supply method is adopted, step 8 is as follows:

[0079] Step 8.1, open the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33, and simultaneously monitor the valve back pressures of the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26 and the fourth high-pressure gas cylinder first charging valve 31, which are P3, P4, P5 and P6 in sequence; set the preset nitrogen collection amounts of the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29, which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount in sequence; set the first critical pressure value and the fourth critical pressure value;

[0080] Step 8.2, the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 start to collect nitrogen. When the first high-pressure gas cylinder 22, the second high-pressure gas cylinder 23, the third high-pressure gas cylinder 28 and the fourth high-pressure gas cylinder 29 reach their respective preset nitrogen collection amounts, close the corresponding first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, or the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33;

[0081] Step 8.3, after the first high-pressure gas cylinder charging valve 20, the second high-pressure gas cylinder charging valve 25, the third high-pressure gas cylinder charging valve 26, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33 are all closed, the first high-pressure gas cylinder 22 starts to deliver nitrogen to the target device;

[0082] Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P6. If P6 is greater than or equal to the fourth critical pressure value, open the first high-pressure gas cylinder charging valve 20, the fourth high-pressure gas cylinder first charging valve 31, the fourth high-pressure gas cylinder regulating valve 32 and the fourth high-pressure gas cylinder second charging valve 33, so that the nitrogen in the fourth high-pressure gas cylinder 29 flows into the first high-pressure gas cylinder 22 at a constant pressure until P3 is greater than the first critical pressure value; if P6 is less than or equal to the fourth critical pressure value, restart the large-flow high-pressure nitrogen production and supply integrated automation system, and return to step 3 until P3 and P6 are respectively greater than the corresponding critical pressure values, so as to realize the automated production and supply of large-flow high-pressure nitrogen.

[0083] The two modes of "normal nitrogen supply" and "constant pressure nitrogen supply" can be switched during operation as needed.

Claims

1. An integrated automated system for the production and supply of high-flow high-pressure nitrogen, characterized in that: It includes a nitrogen production unit and a nitrogen storage and supply unit; The nitrogen production unit comprises a liquid nitrogen storage tank (4), a liquid nitrogen pump (10), a second vaporizer (14), and a nitrogen heater (16) which are sequentially connected via a main pipe (34); a liquid nitrogen pump inlet discharge valve (8) is provided at the inlet of the liquid nitrogen pump (10), a liquid nitrogen pump outlet discharge valve (11) is provided at the outlet of the liquid nitrogen pump (10), and a nitrogen stop valve (18) is provided on the main pipe (34) at the outlet of the nitrogen heater (16); The nitrogen storage and supply unit comprises a plurality of high-pressure gas cylinders whose input ends are sequentially connected to the downstream pipeline of the nitrogen stop valve (18) and a plurality of gas cylinder valves arranged between the high-pressure gas cylinders and the nitrogen stop valve (18); The liquid nitrogen storage tank (4) is provided with three output ends and one input end, a liquid nitrogen pump inlet valve (6) is provided between the first output end of the liquid nitrogen storage tank (4) and the liquid nitrogen pump (10), and a liquid nitrogen pump outlet valve (13) is provided between the liquid nitrogen pump (10) and the second vaporizer (14); The second output end of the liquid nitrogen storage tank (4) is provided with a first vaporizer (3), a liquid nitrogen storage tank automatic pressure boosting valve (2) is provided between the output end of the first vaporizer (3) and the input end of the liquid nitrogen storage tank (4), and a liquid nitrogen storage tank air release valve (1) is provided at the input end of the liquid nitrogen storage tank (4); the third output end of the liquid nitrogen storage tank (4) is connected to the inlet pipeline of the liquid nitrogen pump (10), and the liquid nitrogen pump air return valve (7) is provided on the pipeline between the third output end of the liquid nitrogen storage tank (4) and the liquid nitrogen pump (10); the liquid nitrogen storage tank (4) is also provided with a liquid nitrogen storage tank pressure and liquid level monitoring sensor (5) for monitoring the internal pressure and liquid level information thereof; Sensors for monitoring pressure are provided before the valve of the liquid nitrogen pump outlet discharge valve (11) and after the valve of the nitrogen stop valve (18) on the main pipeline (34) between the first high-pressure gas cylinder and the second high-pressure gas cylinder; sensors for monitoring temperature are provided before the valve of the liquid nitrogen pump inlet discharge valve (8) and on the nitrogen heater (16).

2. The large-flow high-pressure nitrogen production and supply integrated automation system according to claim 1 is characterized by: The number of the high-pressure gas cylinders is four, namely a first high-pressure gas cylinder (22), a second high-pressure gas cylinder (23), a third high-pressure gas cylinder (28) and a fourth high-pressure gas cylinder (29); the gas cylinder valves include a first high-pressure gas cylinder charging valve (20), a second high-pressure gas cylinder charging valve (25), a third high-pressure gas cylinder charging valve (26) and a first high-pressure gas cylinder charging valve (31) which are respectively arranged between the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) and the nitrogen stop valve (18); Sensors for monitoring pressure are arranged behind the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26) and the first charging valve (31) of the fourth high-pressure gas cylinder.

3. The large-flow high-pressure nitrogen production and supply integrated automation system according to claim 2 is characterized in that: The pressure sensors after the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26) and the first high-pressure gas cylinder charging valve (31), and before the liquid nitrogen pump outlet discharge valve (11) and after the nitrogen shut-off valve (18) are, in sequence, the first high-pressure gas cylinder pressure monitoring sensor (21), the second high-pressure gas cylinder pressure monitoring sensor (24), the third high-pressure gas cylinder pressure monitoring sensor (27), the fourth high-pressure gas cylinder pressure monitoring sensor (30), the liquid nitrogen pump outlet pressure monitoring sensor (12) and the nitrogen charging pipeline pressure monitoring sensor (19); the temperature sensors before the liquid nitrogen pump inlet discharge valve (8) and on the nitrogen heater (16) are, in sequence, the liquid nitrogen pump inlet temperature monitoring sensor (9) and the nitrogen heater temperature monitoring sensor (15).

4. The large-flow high-pressure nitrogen production and supply integrated automation system according to claim 3 is characterized by: The liquid nitrogen storage tank (4), the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) are all provided with a main board, and a memory and a wireless communication module are provided on the main board for storing information on pressure, temperature and liquid level in the container; the outer walls of the liquid nitrogen storage tank (4), the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) are all provided with a two-dimensional code that can be scanned by a terminal device, and the two-dimensional code is used to store ID information of the corresponding container; the wireless communication module is used to push the information on pressure, temperature and liquid level in the container stored in the memory to the terminal device when an operator scans the two-dimensional code.

5. The large-flow high-pressure nitrogen production and supply integrated automation system according to claim 4 is characterized in that: A fourth high-pressure gas cylinder regulating valve (32) and a fourth high-pressure gas cylinder second charging valve (33) are sequentially arranged in front of the first charging valve (31) of the fourth high-pressure gas cylinder; The volume of the liquid nitrogen storage tank (4) is 30m 3 ; The main pipe (34) is made of stainless steel; A nitrogen filter (17) is provided between the nitrogen heater temperature monitoring sensor (15) and the nitrogen stop valve (18).

6. The large-flow high-pressure nitrogen production and supply integrated automation system according to claim 5 is characterized in that: The liquid nitrogen pump inlet discharge valve (8), the liquid nitrogen pump inlet valve (6), the liquid nitrogen pump outlet discharge valve (11), the liquid nitrogen pump outlet valve (13), the nitrogen stop valve (18), the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32), the fourth high-pressure gas cylinder second charging valve (33), the liquid nitrogen pump return valve (7), the liquid nitrogen storage tank automatic pressure boosting valve (2) and the liquid nitrogen storage tank deflation valve (1) are all electrically controlled valves.

7. An integrated automated method for producing and supplying high-flow high-pressure nitrogen, based on the integrated automated system for producing and supplying high-flow high-pressure nitrogen according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1, charging a preset amount of liquid nitrogen into a liquid nitrogen storage tank (4); Step 2: Set the first preset temperature value, the second preset temperature value, the third preset temperature value, the first preset pressure value, the second preset pressure value, and the minimum pressure P of the liquid nitrogen storage tank. x and the maximum pressure of the liquid nitrogen tank P y , and then start the large-flow high-pressure nitrogen production and supply integrated automation system; Step 3: Use the liquid nitrogen storage tank pressure and liquid level monitoring sensor (5) to monitor the pressure P0 and liquid level status information of the liquid nitrogen in the liquid nitrogen storage tank (4) in real time. x When the liquid nitrogen storage tank vent valve (1) is closed and the liquid nitrogen storage tank automatic pressure boosting valve (2) is opened, part of the nitrogen is vaporized through the first vaporizer (3), so that P0 increases until P0 ≥ P y , close the automatic pressure boosting valve (2) of the liquid nitrogen storage tank; Step 4, opening the liquid nitrogen pump inlet valve (6), the liquid nitrogen pump return valve (7) and the liquid nitrogen pump inlet discharge valve (8), and monitoring the valve front temperature of the liquid nitrogen pump inlet discharge valve (8), precooling the liquid nitrogen pump (10) and the pipeline between the liquid nitrogen pump (10) and the liquid nitrogen storage tank (4), and when the valve front temperature of the liquid nitrogen pump inlet discharge valve (8) reaches a first preset temperature value, closing the liquid nitrogen pump inlet discharge valve (8), and assuming that the liquid nitrogen pump (10) and the pipeline between the liquid nitrogen pump (10) and the liquid nitrogen storage tank (4) are precooled; Step 5, opening the liquid nitrogen pump outlet valve (13) and the liquid nitrogen pump (10); Step 6, the vaporizer (14) is turned on, and the liquid nitrogen is pressurized by the liquid nitrogen pump (10) and flows into the vaporizer (14) first, and then enters the nitrogen heater (16), and the temperature T0 in the nitrogen heater (16) is monitored at the same time. If T0 is lower than the second preset temperature value, the nitrogen heater (16) is started; if T0 is greater than or equal to the third preset temperature value, the nitrogen heater (16) is turned off; Step 7, open the nitrogen stop valve (18), start supplying nitrogen, and monitor the pressure P1 before the liquid nitrogen pump outlet discharge valve (11) and the pressure P2 after the nitrogen stop valve (18). When P1=the first preset pressure value, close the liquid nitrogen pump (10); when P2=the second preset pressure value, close the nitrogen stop valve (18), then close the vaporizer (14) and open the liquid nitrogen pump outlet discharge valve (11) to discharge the remaining nitrogen, and finally close the liquid nitrogen pump inlet valve (6) and the liquid nitrogen pump outlet valve (13); Step 8. Several high-pressure gas cylinders begin to balance the nitrogen pressure and deliver nitrogen to the target device. The nitrogen delivery method is ordinary supply or constant pressure supply. During the nitrogen delivery process, the nitrogen pressure in each high-pressure gas cylinder is maintained to meet the preset demand pressure, thereby realizing the automated production and supply of large-flow high-pressure nitrogen.

8. The integrated automated method for producing and supplying high-flow high-pressure nitrogen according to claim 7, characterized in that: When the nitrogen is delivered by ordinary supply, step 8 is specifically as follows: Step 8.1, open the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33), and simultaneously monitor the valve back pressures of the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26) and the fourth high-pressure gas cylinder first charging valve (31), which are P3, P4, P5 and P6 in sequence; set the preset nitrogen collection amounts of the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29), which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount in sequence; Setting a first critical pressure value, a second critical pressure value, and a third critical pressure; Step 8.2, the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) begin to collect nitrogen. When the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) reach their respective preset nitrogen collection amounts, the corresponding first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), or the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33) are closed; Step 8.3, after the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33) are all closed, the first high-pressure gas cylinder (22) starts to deliver nitrogen to the target device; Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P4. If P4 is greater than or equal to the second critical pressure value, open the first high-pressure gas cylinder charging valve (20) and the second high-pressure gas cylinder charging valve (25) to allow the nitrogen in the second high-pressure gas cylinder (23) to flow into the first high-pressure gas cylinder (22) until P3 is greater than the first critical pressure value, and then close the first high-pressure gas cylinder charging valve (20) and the second high-pressure gas cylinder charging valve (25); if P4 is less than or equal to the second critical pressure value, execute step 8.5; Step 8.5, determine the value of P5. If P5 is greater than or equal to the third critical pressure, open the first high-pressure gas cylinder charging valve (20) and the third high-pressure gas cylinder charging valve (26), so that the nitrogen in the third high-pressure gas cylinder (28) flows into the first high-pressure gas cylinder (22) until P3 is greater than the first critical pressure value, and then; if P5 is less than or equal to the third critical pressure, restart the large-flow high-pressure nitrogen production and supply integrated automation system, return to step 3, until P3, P4, and P5 are respectively greater than the corresponding critical pressure values, to achieve the automated production and supply of large-flow high-pressure nitrogen.

9. The integrated automated method for producing and supplying high-flow high-pressure nitrogen according to claim 7, characterized in that: When the nitrogen is delivered in a constant pressure supply mode, step 8 is specifically as follows: Step 8.1, open the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33), and simultaneously monitor the valve back pressures of the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26) and the fourth high-pressure gas cylinder first charging valve (31), which are P3, P4, P5 and P6 in sequence; set the preset nitrogen collection amounts of the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29), which are the first preset nitrogen collection amount, the second preset nitrogen collection amount, the third preset nitrogen collection amount and the fourth preset nitrogen collection amount in sequence; Setting a first critical pressure value and a fourth critical pressure value; Step 8.2, the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) begin to collect nitrogen. When the first high-pressure gas cylinder (22), the second high-pressure gas cylinder (23), the third high-pressure gas cylinder (28) and the fourth high-pressure gas cylinder (29) reach their respective preset nitrogen collection amounts, the corresponding first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), or the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33) are closed; Step 8.3, after the first high-pressure gas cylinder charging valve (20), the second high-pressure gas cylinder charging valve (25), the third high-pressure gas cylinder charging valve (26), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33) are all closed, the first high-pressure gas cylinder (22) starts to deliver nitrogen to the target device; Step 8.4, when P3 is less than or equal to the first critical pressure value, determine the value of P6. If P6 is greater than or equal to the fourth critical pressure value, open the first high-pressure gas cylinder charging valve (20), the fourth high-pressure gas cylinder first charging valve (31), the fourth high-pressure gas cylinder regulating valve (32) and the fourth high-pressure gas cylinder second charging valve (33), so that the nitrogen in the fourth high-pressure gas cylinder (29) flows into the first high-pressure gas cylinder (22) at a constant pressure until P3 is greater than the first critical pressure value; if P6 is less than or equal to the fourth critical pressure value, restart the large-flow high-pressure nitrogen production and supply integrated automation system, and return to step 3 until P3 and P6 are respectively greater than the corresponding critical pressure values, thereby realizing the automated production and supply of large-flow high-pressure nitrogen.

10. The integrated automated method for producing and supplying high-flow high-pressure nitrogen according to claim 8 or 9, characterized in that: In step 3, the P x =0.15MPa, P y =0.3MPa; In step 4, the first preset temperature value is -180°C; In step 6, the second preset temperature value is -40°C, and the third preset temperature value is 20°C.

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