Device and method for preparing low-temperature liquid oxygen-containing nitrous oxide

Abstract

The invention provides a device and a method for preparing low-temperature liquid oxygen-containing nitrous oxide, and relates to the technical field of preparation of low-temperature liquid oxygen-containing nitrous oxide. The device comprises a low-temperature liquid nitrous oxide storage tank, a liquid oxygen storage tank and an Nytrox storage tank used for storing liquid oxygen-containing nitrous oxide, the liquid oxygen storage tank is connected with the low-temperature liquid nitrous oxide storage tank in parallel through a conveying mechanism and then is communicated with the Nytrox storage tank through a liquid inlet hose, and the Nytrox storage tank is placed on a balance for weight monitoring; the conveying mechanism is any one of an extrusion conveying mechanism and a pumping pressure conveying mechanism; the extrusion conveying mechanism comprises a liquid oxygen temporary storage tank communicated with the liquid oxygen storage tank and a high-pressure oxygen bottle communicated with the liquid oxygen temporary storage tank; and the pumping pressure conveying mechanism comprises an electric liquid oxygen pump communicated with the liquid oxygen storage tank. The invention overcomes the defects of the prior art, can effectively reduce the production and storage and transportation cost, and is suitable for batch preparation and use in multiple sites.

Description

Technical Field

[0001] The invention relates to the technical field of preparing cryogenic liquid oxygen-containing nitrous oxide, and in particular to a device and a method for preparing cryogenic liquid oxygen-containing nitrous oxide. Background Art

[0002] In 2009, Arif Karabeyoglu of the American Space Propulsion Group, Inc. proposed the use of nitrous oxide (N 2 O, also known as nitrous oxide, laughing gas) and oxygen (O 2 Arif Karabeyoglu has proposed a method for preparing a mixture of oxygen-containing nitrous oxide (hereinafter referred to as Nytrox) as an oxidant for aerospace propulsion, and named it Nytrox, which is believed to have better overall performance. However, Arif Karabeyoglu did not specify a specific method for preparing oxygen-containing nitrous oxide (hereinafter referred to as Nytrox).

[0003] In 2019, Professor Stephen A. Witmore of Utah State University in the United States used the gas-phase mixed condensation method to prepare 0°C liquid Nytrox containing 87% by mass fraction of nitrous oxide, but failed to achieve large-scale production and the preparation of low-temperature (<-10°C) liquid Nytrox.

[0004] On July 15, 2020, Shandong Baiyan Chemical Co., Ltd. disclosed the technical standards for preparing medical-grade oxygen-containing nitrous oxide with a nitrous oxide mole fraction of 50% in the enterprise standard Q / 0305SDBY023-2020 "Oxygen and Nitrous Oxide Mixture". The preparation methods involved include the weight method and the pressure method, but no more specific preparation methods are described.

[0005] In general, the mass fraction of nitrous oxide required when Nytrox is actually used as a propellant is usually above 65%, and it needs to be stored in a low-temperature and high-pressure liquid state. The existing methods have the problems of small preparation amounts and insufficiently low temperatures, and are not yet sufficient in scale and economy to meet the needs of preparing low-temperature and high-pressure liquid Nytrox. Summary of the invention

[0006] In view of the shortcomings of the prior art, the present invention provides a device and method for preparing cryogenic liquid oxygen-containing nitrous oxide. The device is easy to modify and convenient for use in multiple scenarios. The overall production effect is safe and efficient.

[0007] To achieve the above objectives, the technical solution of the present invention is implemented through the following technical solutions:

[0008] A device for preparing cryogenic liquid oxygen-containing nitrous oxide comprises a cryogenic liquid nitrous oxide storage tank, a liquid oxygen storage tank and a Nytrox storage tank for storing liquid oxygen-containing nitrous oxide. The liquid oxygen storage tank is connected in parallel with the cryogenic liquid nitrous oxide storage tank through a conveying mechanism and then connected to the Nytrox storage tank through a liquid inlet hose. The Nytrox storage tank is placed on a balance for weight monitoring. The conveying mechanism is any one of an extrusion conveying mechanism and a pump pressure conveying mechanism. The extrusion conveying mechanism comprises a liquid oxygen temporary storage tank connected to the liquid oxygen storage tank and a liquid oxygen temporary storage tank connected to the liquid oxygen temporary storage tank. High-pressure oxygen cylinder; the pumping and conveying mechanism includes an electric liquid oxygen pump connected to the liquid oxygen storage tank; the liquid inlet hose is provided with a Nytrox tank liquid inlet valve; the low-temperature liquid nitrous oxide storage tank adopts a nitrous oxide liquid outlet valve to control the nitrous oxide liquid outlet, and the liquid oxygen storage tank is provided with a liquid oxygen liquid outlet valve to control the liquid oxygen; the Nytrox tank is provided with a Nytrox tank pressure sensor, and a Nytrox tank air outlet valve and a Nytrox tank safety valve are provided in parallel between the Nytrox tank and the Nytrox tank pressure sensor.

[0009] Preferably, the high-pressure oxygen cylinder is provided with an oxygen cylinder valve.

[0010] Preferably, when the conveying mechanism is an extrusion conveying mechanism, the liquid oxygen temporary storage tank is connected to a liquid inlet pipeline precooling exhaust valve.

[0011] Preferably, when the delivery mechanism is a pump pressure delivery mechanism, the electric liquid oxygen pump is connected to a liquid inlet pipeline precooling exhaust valve.

[0012] Preferably, the Nytrox tank is connected to a Nytrox tank liquid temperature sensor.

[0013] The method for preparing low-temperature liquid oxygen-containing nitrous oxide is to use any device of claims 1 to 5 to prepare it, and the specific preparation method comprises the following steps:

[0014] S1. Prepare sufficient amounts of cryogenic liquid nitrous oxide, cryogenic liquid oxygen and normal temperature high pressure oxygen according to the given formula and total mass;

[0015] S2, using N 2 OO 2 The state equation is used to calculate the total volume, pressure and final temperature of the mixture, and the Nytrox tank is set to store the mixed liquid oxygen-containing nitrous oxide according to these parameters;

[0016] S3, opening the nitrous oxide outlet valve and the Nytrox tank inlet valve, and filling the Nytrox tank with nitrous oxide to the required weight ratio;

[0017] S4. Recalculate the required liquid oxygen filling mass and volume based on the actual filling weight of nitrous oxide measured by the balance;

[0018] S5, then open the liquid oxygen outlet valve, use the conveying mechanism to convey the liquid oxygen to the Nytrox tank through the Nytrox tank inlet valve, reduce the opening of the Nytrox tank inlet valve when approaching the expected weight, and completely close the Nytrox tank inlet valve when reaching the expected weight;

[0019] S6. Wait for the mixture to stand and be evenly mixed. When the tank temperature and tank pressure of the Nytrox storage tank are basically stable, the preparation is completed.

[0020] Preferably, during the operation of step S3, the Nytrox tank outlet valve may be briefly opened to reduce the pressure of the Nytrox tank so that the liquid in the nitrous oxide tank can flow out rapidly by its own vapor pressure, and then the nitrous oxide liquid outlet valve is closed.

[0021] Preferably, when the conveying mechanism is an extrusion conveying mechanism, the specific operation in step S5 is: open the liquid oxygen outlet valve, fill the liquid oxygen slightly exceeding the required filling volume into the liquid oxygen temporary storage tank, close the liquid oxygen outlet valve, open the oxygen cylinder valve, gradually open the Nytrox tank inlet valve, and fill the Nytrox tank with liquid oxygen at an appropriate flow rate.

[0022] Preferably, when the delivery mechanism is a pump delivery mechanism, the specific operation in step S5 is: opening the liquid oxygen outlet valve and the Nytrox tank inlet valve, and directly controlling the liquid oxygen to be poured into the Nytrox tank through the electric liquid oxygen pump.

[0023] Preferably, during the operation, if the cryogenic liquid nitrous oxide or liquid oxygen charged into the Nytrox tank at a single time is insufficient to reach the expected weight, the above process can be repeated multiple times, and during the operation, sufficient cryogenic liquid nitrous oxide is charged first and then liquid oxygen is charged.

[0024] The present invention provides a device and method for preparing low-temperature liquid oxygen-containing nitrous oxide, which has the following advantages over the prior art:

[0025] The present invention can solve the problem that the prior art cannot be economically scaled up for large flow (>=100g / s), large batch (>=100kg / time) and accurate configuration of low temperature (<=50℃) containing high nitrous oxide mass fraction (Y_N 2In order to solve the problem of liquid oxygen-containing nitrous oxide (Nytrox) with a concentration of O>=65%, a Nytrox storage tank is used to store liquid oxygen and liquid nitrous oxide to prepare Nytrox, which has low cost, convenient storage and transportation, high safety, and is suitable for batch preparation. When an extrusion conveying mechanism is used, it can be operated without an external power supply, and is suitable for preparation in an outdoor environment. At the same time, the entire device is relatively simple and can be applied to production in multiple sites and modification of existing production lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Flow chart of the present invention using liquid oxygen and cryogenic liquid nitrous oxide to prepare oxygen-containing nitrous oxide

[0027] Figure 2 This is a schematic diagram of the Nytrox preparation device in Example 1 of the present invention;

[0028] Figure 3 This is a schematic diagram of a Nytrox preparation device in Example 2 of the present invention;

[0029] In the figure: 1. Nytrox storage tank; 2. Cryogenic liquid nitrous oxide storage tank; 3. Liquid oxygen storage tank; 4. Nitrous oxide outlet valve; 5. Liquid oxygen outlet valve; 6. Nytrox tank inlet valve; 7. Nytrox tank outlet valve; 8. Nytrox tank safety valve; 9. Nytrox tank liquid temperature sensor; 10. Nytrox tank pressure sensor; 11. Liquid inlet hose; 12. Liquid inlet pipeline pre-cooling exhaust valve; 13. Liquid oxygen temporary storage tank; 14. High-pressure oxygen cylinder; 15. Oxygen cylinder valve; 16. Balance; 17. Electric liquid oxygen pump. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] The test requires 100 kg of liquid Nytrox with a 70% nitrous oxide mass fraction, -50°C, and 10 MPa (absolute pressure). Figure 2 The device shown (extrusion conveying mechanism);

[0033] A cryogenic liquid nitrous oxide storage tank (2), a liquid oxygen storage tank (3) and a Nytrox storage tank (1) for storing liquid oxygen-containing nitrous oxide are provided. The liquid oxygen storage tank (3) is connected to a liquid oxygen temporary storage tank 13 via a liquid oxygen outlet valve 5, and the liquid oxygen temporary storage tank 13 is connected to a high-pressure oxygen cylinder 14. An oxygen cylinder valve 15 is provided between the high-pressure oxygen cylinder and the liquid oxygen temporary storage tank 13. A liquid inlet pipeline precooling exhaust valve 12 is provided on the liquid oxygen temporary storage tank 13. In addition, the liquid oxygen temporary storage tank 13 is connected to the Nytrox storage tank 1 via a liquid inlet hose. A nitrous oxide liquid outlet valve 4 is provided on the nitrous oxide storage tank 2 and is connected to the Nytrox storage tank 1 through a liquid inlet hose 11, and a Nytrox storage tank liquid inlet valve 6 is provided on the liquid inlet hose 11. The Nytrox storage tank 1 is placed on a balance 16, a Nytrox storage tank 1 is connected to a Nytrox storage tank pressure sensor 10, and a Nytrox storage tank air outlet valve 7 and a Nytrox storage tank safety valve 8 are connected in parallel to the Nytrox storage tank 1, and the Nytrox storage tank 1 is also connected to a Nytrox storage tank liquid temperature sensor 9.

[0034] When designing an experiment:

[0035] (1) First, according to the mixture state equation in the refprop v10 software, it can be calculated that the density of liquid Nytrox with a nitrous oxide mass fraction of 70% (referred to as Nytrox70L) at 10MPa is 948.7g / L, and the effective volume of Nytrox tank 1 needs to be more than 105.41L. Assuming that the air pillow volume is 10%, the required volume of Nytrox tank 1 needs to be greater than 117.12L;

[0036] (2) Assuming that the raw materials are saturated liquid N2O (-38.2°C, density 1068.3 g / L) and liquid oxygen (-153.5°C, density 976.3 g / L) at 1 MPa (absolute pressure), they are mixed in proportion and filled into the above-mentioned Nytrox storage tank 1. Assuming adiabatic isobaric mixing, the temperature will drop to -82°C and the pressure will reach about 4.84 MPa (absolute pressure). Therefore, the operating temperature of the Nytrox storage tank 1 needs to reach -82°C and the operating pressure needs to reach 10 MPa (absolute pressure). The prepared liquid oxygen temporary storage tank 13 needs to have an operating temperature that reaches the liquid oxygen temperature zone and an operating pressure that reaches 10 MPa (absolute pressure). If a single squeeze filling is required, the volume needs to be no less than 32 L;

[0037] (3) According to the 10% surplus, 33kg of liquid oxygen and 77kg of cryogenic liquid nitrous oxide need to be prepared. The containers specified in GB / T24159-2022 "Welded Insulated Gas Cylinders" can be used for storage and transportation. In addition, a bottle of high-pressure oxygen (40L) in a high-pressure seamless gas cylinder is required, and the residual pressure of the cylinder is greater than or equal to 10MPa;

[0038] (4) The 16-meter range of the balance must cover the total weight of the required Nytrox tank 1, the liquid contained, and the accessories;

[0039] (5) Press Figure 2 Build the piping system, conduct pressure testing and debugging to ensure normal and reliable operation;

[0040] (6) Open the cryogenic liquid nitrous oxide storage tank 2, the nitrous oxide liquid outlet valve 4 and the Nytrox storage tank gas outlet valve 7, slightly open the Nytrox storage tank liquid inlet valve 6 on the Nytrox storage tank 1, pre-charge a small amount of cryogenic liquid nitrous oxide into the Nytrox storage tank 1, vaporize it to pre-cool the pipeline and the Nytrox storage tank 1 and remove the gas in the tank, peel the scale 6, then close the Nytrox storage tank gas outlet valve 7, open the Nytrox storage tank liquid inlet valve 6 on the Nytrox storage tank 1 and charge nitrous oxide to the required weight of 70 kg. If the weight increases slowly during the charging process, the Nytrox storage tank gas outlet valve 7 can be briefly opened to reduce the pressure of the Nytrox storage tank 1 so that the liquid in the cryogenic liquid nitrous oxide storage tank 2 can flow out rapidly by its own vapor pressure. After the reading of the scale 16 reaches 70 kg, close the nitrous oxide liquid outlet valve 4 and the Nytrox tank liquid inlet valve 6 on the Nytrox storage tank 1;

[0041] (7) Based on the measured actual filling weight of nitrous oxide, assuming it is 69.3 kg, the required filling weight of liquid oxygen is recalculated to be 29.7 kg;

[0042] (8) Slightly open the precooling exhaust valve 12 of the liquid inlet pipeline of the liquid oxygen temporary storage tank 13, and after the residual nitrous oxide in the pipeline is vaporized and discharged, first briefly slightly open the liquid oxygen outlet valve 5 of the liquid oxygen storage tank 3 to flush a trace amount of liquid oxygen into the liquid oxygen temporary storage tank 13, so that the nitrous oxide gas in the liquid oxygen temporary storage tank 13 is blown away after the liquid oxygen is vaporized, and then open the liquid oxygen outlet valve 5 of the liquid oxygen storage tank 3 to fill the liquid oxygen temporary storage tank 13 with liquid oxygen exceeding the required filling volume, and finally close the liquid oxygen outlet valve 5 and the precooling exhaust valve 12 of the liquid inlet pipeline;

[0043] (9) Open the oxygen cylinder valve 15 of the normal temperature high pressure oxygen cylinder 14, gradually open the Nytrox tank liquid inlet valve 6 on the Nytrox tank 1, and pour liquid oxygen into the Nytrox tank 1 at an appropriate flow rate;

[0044] (10) When approaching the expected final weight, reduce the opening of the Nytrox tank inlet valve 6, and completely close the Nytrox tank inlet valve 6 when reaching the expected final weight;

[0045] (11) Wait for the mixture to be uniform and confirm the total filling amount after the tank temperature and tank pressure of Nytrox storage tank 1 are basically stable. Record and calculate the actual filling amount and components, and provide them for the next stage of work.

[0046] Embodiment 2:

[0047] The test requires 100 kg of liquid Nytrox with a 70% nitrous oxide mass fraction, -50°C, and 10 MPa (absolute pressure). Figure 3 The device shown (pumping delivery mechanism);

[0048] A cryogenic liquid nitrous oxide storage tank (2), a liquid oxygen storage tank (3) and a Nytrox storage tank (1) for storing liquid oxygen-containing nitrous oxide are provided. The liquid oxygen storage tank (3) is connected to an electric liquid oxygen pump 17 via a liquid oxygen outlet valve 5, and the electric liquid oxygen pump 17 is provided with a liquid inlet pipeline precooling exhaust valve 12. In addition, the electric liquid oxygen pump 17 is connected to the Nytrox storage tank 1 via a liquid inlet hose. The cryogenic liquid nitrous oxide storage tank 2 is provided with a nitrous oxide outlet valve 4 and connected to the Nytrox storage tank 1. The x storage tank 1 is connected through a liquid inlet hose 11, and a Nytrox storage tank liquid inlet valve 6 is provided on the liquid inlet hose 11. The Nytrox storage tank 1 is placed on a balance 16. The Nytrox storage tank 1 is connected to a Nytrox storage tank pressure sensor 10, and the Nytrox storage tank 1 is connected in parallel with a Nytrox storage tank air outlet valve 7 and a Nytrox storage tank safety valve 8, and the Nytrox storage tank 1 is also connected to a Nytrox storage tank liquid temperature sensor 9.

[0049] When designing an experiment:

[0050] (1) First, according to the mixture state equation in the refprop v10 software, it can be calculated that the density of liquid Nytrox with a nitrous oxide mass fraction of 70% (referred to as Nytrox70L) at 10MPa is 948.7g / L. The effective volume of the Nytrox tank needs to be more than 105.41L. Assuming that the air pillow volume is 10%, the required tank volume needs to be greater than 117.12L;

[0051] (2) Assuming that the raw materials are saturated liquid N2O (-38.2°C, density 1068.3 g / L) and liquid oxygen (-153.5°C, density 976.3 g / L) at 1 MPa (absolute pressure), they are mixed in proportion and filled into the above-mentioned Nytrox storage tank 1. Assuming adiabatic isobaric mixing, the temperature will drop to -82°C and the pressure will reach about 4.84 MPa (absolute pressure). Therefore, the operating temperature of the Nytrox storage tank 1 needs to reach -82°C, the operating pressure needs to reach 10 MPa (absolute pressure), and the pumping pressure of the prepared electric liquid oxygen pump 17 needs to reach 10 MPa. In order to achieve fast and stable filling, the rated pumping flow rate of the electric liquid oxygen pump 17 is not less than 1 kg / min;

[0052] (3) According to the 10% surplus, 77kg of cryogenic liquid nitrous oxide and more liquid oxygen should be prepared. The containers specified in GB / T 24159-2022 "Welded Insulated Gas Cylinders" can be used for storage and transportation. In addition, a bottle of high-pressure oxygen (40L) in a high-pressure seamless gas cylinder should be prepared, and the residual pressure of the cylinder should be greater than or equal to 10MPa;

[0053] (4) The 16-meter range of the balance must cover the total weight of the required Nytrox tank 1, the liquid contained, and the accessories;

[0054] (5) Press Figure 3 Build the piping system, conduct pressure testing and debugging to ensure normal and reliable operation.

[0055] (6) Open the cryogenic liquid nitrous oxide storage tank 2, the nitrous oxide liquid outlet valve 4 and the Nytrox storage tank gas outlet valve 7, slightly open the Nytrox storage tank liquid inlet valve 6 on the Nytrox storage tank 1, pre-charge a small amount of cryogenic liquid nitrous oxide into the Nytrox storage tank 1, vaporize it to pre-cool the pipeline and the Nytrox storage tank 1 and remove the gas in the tank, peel the scale 16, then close the Nytrox storage tank gas outlet valve 7, open the Nytrox storage tank liquid inlet valve 6 on the Nytrox storage tank 1 and charge nitrous oxide to the required weight of 70 kg. If the weight increases slowly during the charging process, the Nytrox storage tank gas outlet valve 7 can be briefly opened to reduce the pressure of the Nytrox storage tank 1 so that the liquid in the cryogenic liquid nitrous oxide storage tank 2 can flow out rapidly by its own vapor pressure. After the reading of the scale 16 reaches 70 kg, close the nitrous oxide liquid outlet valve 4 and the Nytrox tank liquid inlet valve on the Nytrox storage tank 1;

[0056] (7) Based on the measured actual filling weight of nitrous oxide, assuming it is 69.3 kg, the required filling weight of liquid oxygen is recalculated to be 29.7 kg;

[0057] (8) Slightly open the precooling exhaust valve 12 of the liquid inlet pipeline, and after the residual nitrous oxide in the pipeline is vaporized and discharged, first open the liquid oxygen outlet valve 5 of the liquid oxygen storage tank 3 to fill the electric liquid oxygen pump 17 with liquid oxygen for precooling. The precooled liquid oxygen is discharged from the precooling exhaust valve 12 of the liquid inlet pipeline. When the discharged liquid oxygen is in liquid state, open the Nytrox tank inlet valve 6 on the Nytrox tank 1 and start the electric liquid oxygen pump 17 to fill the Nytrox tank 1 with liquid oxygen at an appropriate flow rate;

[0058] (9) When approaching the expected final weight, reduce the flow rate of the electric liquid oxygen pump 17, and completely close the electric liquid oxygen pump 17 and the Nytrox tank inlet valve 6 when reaching the expected weight;

[0059] (10) Wait for the mixture to be evenly mixed. After the tank temperature and tank pressure of the Nytrox storage tank 1 are basically stable, confirm the total filling amount, record and calculate the actual filling amount and components, and provide them for the next stage of work;

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preparing cryogenic liquid oxygen-containing nitrous oxide, comprising a cryogenic liquid nitrous oxide storage tank (2), a liquid oxygen storage tank (3) and a Nytrox storage tank (1) for storing liquid oxygen-containing nitrous oxide, characterized in that: The liquid oxygen storage tank (3) is connected in parallel with the cryogenic liquid nitrous oxide storage tank (2) through a conveying mechanism and then connected to the Nytrox storage tank (1) through a liquid inlet hose (11), and the Nytrox storage tank (1) is placed on a balance (16) for weight monitoring; The conveying mechanism is any one of an extrusion conveying mechanism and a pump pressure conveying mechanism; The extrusion conveying mechanism comprises a temporary liquid oxygen storage tank (13) connected to the liquid oxygen storage tank (3) and a high-pressure oxygen cylinder (14) connected to the temporary liquid oxygen storage tank (13); The pumping and conveying mechanism comprises an electric liquid oxygen pump (17) connected to the liquid oxygen storage tank (3); The liquid inlet hose (11) is provided with a Nytrox tank liquid inlet valve (6); the cryogenic liquid nitrous oxide storage tank (2) uses a nitrous oxide liquid outlet valve (4) to control the nitrous oxide liquid outlet, and the liquid oxygen storage tank (3) is provided with a liquid oxygen liquid outlet valve (5) to control the liquid oxygen; The Nytrox tank (1) is provided with a Nytrox tank pressure sensor (10), and a Nytrox tank air outlet valve (7) and a Nytrox tank safety valve (8) are provided in parallel between the Nytrox tank (1) and the Nytrox tank pressure sensor (10).

2. The device according to claim 1, characterized in that: The high-pressure oxygen cylinder (14) is provided with an oxygen cylinder valve (15).

3. The device according to claim 1, characterized in that: When the conveying mechanism is an extrusion conveying mechanism, the liquid oxygen temporary storage tank (13) is connected to a liquid inlet pipeline precooling exhaust valve (12).

4. The device according to claim 1, characterized in that: When the delivery mechanism is a pump pressure delivery mechanism, the electric liquid oxygen pump (17) is connected to the liquid inlet pipeline precooling exhaust valve (12).

5. The device according to claim 1, characterized in that: The Nytrox storage tank (1) is connected to a Nytrox storage tank liquid temperature sensor (9).

6. A method for preparing cryogenic liquid oxygen-containing nitrous oxide, characterized in that: The method is to use any device of claims 1-5 to prepare the product, and the specific preparation method comprises the following steps: S1. Prepare sufficient amounts of cryogenic liquid nitrous oxide, cryogenic liquid oxygen and normal temperature high pressure oxygen according to the given formula and total mass; S2. Calculate the total volume, pressure and final temperature of the mixture required by the N2O-O2 state equation, and set the Nytrox storage tank (1) to store the mixed liquid oxygen-containing nitrous oxide according to these parameters; S3, opening the nitrous oxide liquid outlet valve (4) and the Nytrox tank liquid inlet valve (6), and filling the Nytrox tank (1) with nitrous oxide to a desired weight ratio; S4. Recalculate the required liquid oxygen filling mass and volume according to the actual filling weight of nitrous oxide measured by the balance (16); S5, then open the liquid oxygen outlet valve (5), use the conveying mechanism to convey the liquid oxygen to the Nytrox storage tank (1) through the Nytrox storage tank inlet valve (6), and reduce the opening of the Nytrox storage tank inlet valve (6) when approaching the expected weight, and completely close the Nytrox storage tank inlet valve (6) when reaching the expected weight; S6. Wait for the mixture to be uniform and for the tank temperature and tank pressure of the Nytrox storage tank (1) to be basically stable, and the preparation is completed.

7. The method according to claim 6, characterized in that: During the operation of step S3, the Nytrox tank outlet valve (7) may be briefly opened to reduce the pressure of the Nytrox tank (1) so that the liquid in the nitrous oxide tank can flow out rapidly by its own vapor pressure, and then the nitrous oxide liquid outlet valve (4) may be closed.

8. The method according to claim 6, characterized in that: When the conveying mechanism is an extrusion conveying mechanism, the specific operation in step S5 is: opening the liquid oxygen outlet valve (5), filling the liquid oxygen temporary storage tank (13) with liquid oxygen slightly exceeding the required filling volume, closing the liquid oxygen outlet valve (5), opening the oxygen cylinder valve (15), gradually opening the Nytrox storage tank inlet valve (6), and filling the Nytrox storage tank (1) with liquid oxygen at an appropriate flow rate.

9. The method according to claim 6, characterized in that: When the delivery mechanism is a pump delivery mechanism, the specific operation in step S5 is: opening the liquid oxygen outlet valve (5) and the Nytrox tank inlet valve (6), and directly controlling the liquid oxygen to be poured into the Nytrox tank (1) through the electric liquid oxygen pump (17).

10. The method according to claim 6, characterized in that: During the whole operation, if the cryogenic liquid nitrous oxide or liquid oxygen charged into the Nytrox storage tank (1) at a single time is insufficient to reach the expected weight, the above process can be repeated multiple times, and during the operation, sufficient cryogenic liquid nitrous oxide is charged first and then liquid oxygen is charged.

Images