Method for adjusting raw material flow in poor krypton tower by using crude argon condenser

Abstract

The invention relates to a method for adjusting raw material flow in a poor krypton tower by using a crude argon condenser, which belongs to the technical field of flow measurement, and comprises the following steps of: 1) filling the crude argon condenser with oxygen and nitrogen, adjusting the temperature in the crude argon condenser, and reducing the temperature in the crude argon condenser according to a mode of 1 DEG C / s; (2) in the process that the temperature in the crude argon condenser is reduced, poor krypton tower raw materials are input into the crude argon condenser, and the flow of the poor krypton tower raw materials added into the crude argon condenser is adjusted; (3) after oxygen and nitrogen in the crude argon condenser are liquid oxygen and liquid nitrogen respectively, input of the poor krypton tower raw materials is stopped, and the temperature in the crude argon condenser is kept; (4) the temperature in the crude argon condenser is adjusted, and the liquid oxygen and the liquid nitrogen are kept in the liquid state; the method has the beneficial effects that in the process of reducing the temperature in the crude argon condenser, the poor krypton tower raw material is input into the crude argon condenser, and the flow of the poor krypton tower raw material is adjusted by adopting a temperature mass metering method.

Description

Technical Field

[0001] The invention belongs to the technical field of flow measurement, and in particular relates to a method for regulating the flow of raw materials in a krypton-depleted tower by using a crude argon condenser. Background Art

[0002] Crude argon tower or crude argon condenser is an industrial equipment mainly used to separate argon. In the separation process, it needs to cooperate with a variety of technical measures and equipment, among which the condenser is an important component. Crude argon tower condenser is a device that can reduce the temperature of gas and condense it into liquid, which reduces the risk of gas escape and helps to improve the efficiency of argon collection. It is a vital component of crude argon tower.

[0003] The gas produced by the crude argon tower is cooled by the condenser and condensed into liquid on the surface, so that the gas can be better controlled when flowing through the condenser. In addition, the function of the crude argon condenser is to cool the gas and turn it into liquid, thereby improving the collection efficiency. The function of the crude argon tower condenser is to protect the normal operation of downstream equipment by reducing the gas temperature and pressure, and extend the service life of downstream equipment.

[0004] Since the crude argon condenser can cool the gas and turn it into liquid, the oxygen-nitrogen mixed gas can become liquid after entering the crude argon condenser. After the krypton-depleted tower raw material enters the crude argon condenser, the krypton-depleted tower raw material can efficiently extract oxygen and nitrogen products when oxygen and nitrogen are in liquid state. Therefore, flow control is required after the krypton-depleted tower raw material enters the crude argon condenser. Summary of the invention

[0005] The technical problem to be solved by the present invention is how to control the flow rate of the raw material of the krypton-depleted tower after entering the crude argon condenser. The present invention provides a method for regulating the flow rate of the raw material in the krypton-depleted tower by using the crude argon condenser. In the process of lowering the temperature in the crude argon condenser, the raw material of the krypton-depleted tower is input into the crude argon condenser, and the flow rate of the raw material of the krypton-depleted tower added into the crude argon condenser is adjusted. After the oxygen and nitrogen in the crude argon condenser are respectively converted into liquid oxygen and liquid nitrogen, the krypton-depleted xenon in the liquid oxygen is extracted.

[0006] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0007] A method for regulating the flow rate of raw materials in a krypton-depleted tower by using a crude argon condenser comprises the following steps:

[0008] Step 1: Fill the crude argon condenser with oxygen and nitrogen, and adjust the temperature in the crude argon condenser so that the temperature in the crude argon condenser decreases at a rate of 1°C / s;

[0009] Step 2: During the process of lowering the temperature in the crude argon condenser, the krypton-depleted tower raw material is input into the crude argon condenser, and the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted;

[0010] Step 3: After the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature in the crude argon condenser;

[0011] Step 4: Adjust the temperature in the crude argon condenser to keep the liquid oxygen and liquid nitrogen in liquid state.

[0012] Optionally, in step 1, the temperature in the crude argon condenser is adjusted using a time-temperature adjustment method, and the time-temperature method is the following formula:

[0013] ;

[0014] in, is the unit time, is a unit temperature that can be raised or lowered. is the unit temperature increased or decreased in unit time;

[0015] To increase or decrease the unit temperature per unit time, It is the operation of increasing or decreasing the unit temperature within the unit time;

[0016] To adjust the unit temperature according to the unit time, is the unit time and unit temperature, is the execution function for adjusting the unit temperature within the unit time;

[0017] is the recorded temperature, For the recorded time, is the recorded temperature and the recorded time.

[0018] Optionally, in step 2, during the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted by the following steps:

[0019] Step S1: inputting krypton-depleted tower raw materials into the crude argon condenser as the temperature in the crude argon condenser decreases by 1°C;

[0020] Step S2: inputting the krypton-depleted tower raw material into the crude argon condenser until the oxygen and nitrogen in the crude argon condenser become liquid.

[0021] Furthermore, in step S2, in the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the quality of the input krypton-depleted tower raw material is adjusted by the following steps:

[0022] Step 00: Calculate the mass of the raw material for the krypton-depleted tower input into the crude argon condenser per second, and adjust the mass of the raw material for the krypton-depleted tower according to the temperature in the crude argon condenser;

[0023] Step 01: The lower the temperature in the crude argon condenser, the less mass of the krypton-depleted tower raw material is input into the crude argon condenser.

[0024] Furthermore, in step S2, during the process of inputting the krypton-depleted tower raw material into the crude argon condenser per second, the mass of the krypton-depleted tower raw material is adjusted by using a temperature-mass metering method, and the temperature-mass metering method uses the following formula:

[0025] ;

[0026] in, is the i-th moment, From the 1st moment to the Nth moment, To select a moment from the 1st moment to the Nth moment;

[0027] is the temperature in the crude argon condenser at the i-th moment, To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is ; To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is The operation function of

[0028] For the i-th moment The temperature in the crude argon condenser is , at a temperature of At the same time, the measured value of the raw material mass of the krypton-depleted tower is input into the crude argon condenser.

[0029] Optionally, in step 3, after the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature below the boiling point of liquid nitrogen.

[0030] Furthermore, krypton-depleted xenon in the oxygen-nitrogen mixed liquid in the crude argon condenser is extracted, wherein krypton-depleted xenon in the liquid oxygen is extracted.

[0031] Furthermore, the temperature in the crude argon condenser is adjusted to the boiling point of liquid nitrogen, and then the krypton-depleted xenon in the liquid oxygen is extracted.

[0032] Further, the temperature in the crude argon condenser is adjusted to the boiling point of liquid oxygen, and after the liquid oxygen and liquid nitrogen are respectively oxygen and nitrogen, it is detected whether there is krypton-depleted xenon in the crude argon condenser.

[0033] Optionally, in step 4, the temperature in the crude argon condenser is adjusted again until the oxygen and nitrogen are in liquid state.

[0034] Beneficial effects of the present invention:

[0035] 1. The present invention adjusts the flow rate of the krypton-depleted tower raw material in the crude argon condenser. During the temperature reduction process in the crude argon condenser, the krypton-depleted tower raw material is input into the crude argon condenser, and the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted, thereby avoiding the reduction of the extraction rate of oxygen and nitrogen products. Since the temperature in the crude argon condenser can be adjusted, the temperature is adjusted and maintained in a low-temperature environment, and the low-temperature temperature in the crude argon condenser is adjusted to extract liquid oxygen and liquid nitrogen (because the liquid temperatures of liquid oxygen and liquid nitrogen are different). In the liquid oxygen environment, the flow rate of the krypton-depleted tower raw material entering the crude argon condenser is adjusted according to proportion and time, and the krypton-depleted tower raw material extracts krypton-depleted xenon in the liquid oxygen.

[0036] 2. The present invention adopts a time-temperature regulation method to regulate the temperature in the crude argon condenser, and adopts a time-temperature regulation method to regulate the temperature in the crude argon condenser, so that the temperature in the crude argon condenser is reduced by 1°C / s.

[0037] 3. In the process of inputting krypton-depleted tower raw materials into the crude argon condenser per second, the present invention adjusts the mass of the krypton-depleted tower raw materials input. Specifically, the mass of the krypton-depleted tower raw materials input into the crude argon condenser per second is calculated, and the mass of the krypton-depleted tower raw materials is adjusted according to the temperature in the crude argon condenser. The lower the temperature in the crude argon condenser, the less the mass of the krypton-depleted tower raw materials input into the crude argon condenser.

[0038] 4. After the oxygen and nitrogen in the crude argon condenser of the present invention are respectively converted into liquid oxygen and liquid nitrogen, the krypton-depleted xenon in the liquid oxygen of the oxygen-nitrogen mixed liquid is extracted by maintaining the temperature below the boiling point of the liquid nitrogen; then, the temperature in the crude argon condenser is raised to the boiling point of the liquid nitrogen, and the krypton-depleted xenon in the liquid oxygen is extracted again. In this way, the krypton-depleted xenon in the liquid oxygen of the oxygen-nitrogen mixed liquid and the krypton-depleted xenon in the pure liquid oxygen are extracted, and the krypton-depleted xenon is extracted in two steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the workflow of the present invention;

[0041] Figure 2 This is a flow chart of the flow rate regulation of adding the raw material of the depleted krypton tower into the crude argon condenser of the present invention;

[0042] Figure 3 The mass regulation flow chart of adding the raw material of the depleted krypton tower into the crude argon condenser of the present invention;

[0043] Figure 4 It is a schematic diagram of the system structure of the present invention.

[0044] Icons: 1-crude argon condenser, 2-flow regulating device, 3-temperature detection controller, 4-refrigeration plate, 5-switch valve, 6-temperature sensor, 01-first pipeline, 02-second pipeline, 03-third pipeline. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0046] Embodiment 1;

[0047] like Figure 4 As shown, this embodiment provides a regulating system for regulating the raw material flow in the krypton-depleted tower by using a crude argon condenser. The crude argon condenser 1 is connected to a first pipeline 01, a second pipeline 02 and a third pipeline 03. The first pipeline 01 passes oxygen into the crude argon condenser 1, the second pipeline 02 passes nitrogen into the crude argon condenser 1, and the third pipeline 03 inputs the raw material for the krypton-depleted tower into the crude argon condenser 1.

[0048] On the first pipeline 01 , the second pipeline 02 and the third pipeline 03 , a switch valve 5 is installed respectively, and the switch valve 5 is used to open and close each pipeline of the first pipeline 01 , the second pipeline 02 and the third pipeline 03 .

[0049] A flow regulating device 2 is installed on the third pipeline 03. The flow regulating device 2 is installed between the switch valve 5 and the crude argon condenser 1. The flow regulating device 2 is an electronically controlled device. The flow regulating device 2 is used to control or regulate the flow of the krypton-depleted tower raw material added to the interior of the crude argon condenser 1.

[0050] A refrigeration plate 4 and a temperature sensor 6 are installed in the crude argon condenser 1. The refrigeration plate 4 can cool the interior of the crude argon condenser 1. The refrigeration plate 4 is connected to the temperature detection controller 3 outside the crude argon condenser 1 through a circuit. The temperature sensor 6 is used to detect the temperature inside the crude argon condenser 1. The temperature sensor 6 is connected to the temperature detection controller 3 outside the crude argon condenser 1 through a circuit. The temperature detection controller 3 is used to control the temperature of the refrigeration plate 4 and to detect the temperature inside the crude argon condenser 1. The temperature inside the crude argon condenser 1 is detected by the temperature sensor 6, and the temperature detection controller 3 then adjusts the refrigeration temperature of the refrigeration plate 4, and the refrigeration plate 4 cools the interior of the crude argon condenser 1.

[0051] Embodiment 2;

[0052] Based on Example 1, Figure 1 As shown, this embodiment provides a method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser, comprising the following steps:

[0053] Step 1: Fill the crude argon condenser with oxygen and nitrogen, and adjust the temperature in the crude argon condenser so that the temperature in the crude argon condenser decreases at a rate of 1°C / s;

[0054] Step 2: During the process of lowering the temperature in the crude argon condenser, the krypton-depleted tower raw material is input into the crude argon condenser, and the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted;

[0055] Step 3: After the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature in the crude argon condenser;

[0056] Step 4: Adjust the temperature in the crude argon condenser to keep the liquid oxygen and liquid nitrogen in liquid state.

[0057] Embodiment 3;

[0058] Based on Example 2, in step 1, the temperature in the crude argon condenser is adjusted by a time-temperature adjustment method. The temperature in the crude argon condenser is adjusted by a time-temperature adjustment method so that the temperature in the crude argon condenser is reduced by 1°C / s. The time-temperature method is as follows:

[0059] ;

[0060] in, is the unit time, is a unit temperature that can be raised or lowered. is the unit temperature increased or decreased in unit time; It can be seen that in each unit time, the unit temperature increases or decreases, or the temperature increases or decreases at 1℃ / s;

[0061] To increase or decrease the unit temperature per unit time, It is the operation of increasing or decreasing the unit temperature within the unit time;

[0062] To adjust the unit temperature according to the unit time, is the unit time and unit temperature, Measuring the temperature rise or fall by 1°C per second, is the execution function for adjusting the unit temperature within the unit time;

[0063] is the recorded temperature, For the recorded time, is the recorded temperature and the recorded time. That is, the temperature in the crude argon condenser is adjusted during the process. Record a moment. Record the temperature at a certain moment. What is recorded is short-term data, because the temperature in the crude argon condenser is adjusted over time, and time and temperature are changing. As long as the temperature in the crude argon condenser no longer changes, Keep final time and temperature.

[0064] like Figure 2 As shown, in step 2, in the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted, and the following steps are adopted:

[0065] Step S1: inputting krypton-depleted tower raw materials into the crude argon condenser as the temperature in the crude argon condenser decreases by 1°C;

[0066] Step S2: Input the krypton-depleted tower raw material into the crude argon condenser every second until the oxygen and nitrogen in the crude argon condenser become liquid.

[0067] Further, such as Figure 3 As shown, in step S2, during the process of inputting the krypton-depleted tower raw material into the crude argon condenser per second, the quality of the input krypton-depleted tower raw material is adjusted by the following steps:

[0068] Step 00: Calculate the mass of the raw material for the krypton-depleted tower input into the crude argon condenser per second, and adjust the mass of the raw material for the krypton-depleted tower according to the temperature in the crude argon condenser;

[0069] Step 01: The lower the temperature in the crude argon condenser, the less mass of the krypton-depleted tower raw material is input into the crude argon condenser.

[0070] Furthermore, in step S2, during the process of inputting the krypton-depleted tower raw material into the crude argon condenser per second, the mass of the krypton-depleted tower raw material is adjusted by using a temperature-mass metering method, and the temperature-mass metering method uses the following formula:

[0071] ;

[0072] in, is the i-th moment, From the 1st moment to the Nth moment, To select a moment from the 1st moment to the Nth moment;

[0073] is the temperature in the crude argon condenser at the i-th moment, To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is ; To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is The operation function of

[0074] For the i-th moment The temperature in the crude argon condenser is , at a temperature of At the same time, the measured value of the raw material mass of the krypton-depleted tower is input into the crude argon condenser.

[0075] In the formula, record At each moment, select a moment from the 1st moment to the Nth moment, such as: select the i-th moment , the selected i-th moment The corresponding temperature in the crude argon condenser is , at a temperature of When the mass of raw material input to the crude argon condenser is .

[0076] In step 3, after the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature below the boiling point of liquid nitrogen.

[0077] Furthermore, krypton-depleted xenon in the oxygen-nitrogen mixed liquid in the crude argon condenser is extracted, wherein krypton-depleted xenon in the liquid oxygen is extracted.

[0078] The temperature in the crude argon condenser is adjusted to the boiling point of liquid nitrogen, and then the krypton-depleted xenon in the liquid oxygen is extracted.

[0079] Adjust the temperature in the crude argon condenser until it reaches the boiling point of liquid oxygen. After the liquid oxygen and liquid nitrogen are converted into oxygen and nitrogen respectively, check whether there is krypton-depleted xenon in the crude argon condenser. If there is krypton-depleted xenon in the crude argon condenser, the oxygen and nitrogen are in liquid state again, and then extract the krypton-depleted xenon.

[0080] In step 4, the temperature in the crude argon condenser is adjusted again until the oxygen and nitrogen are in liquid state.

[0081] Embodiment 4;

[0082] Based on Example 3, in step 3, after the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the temperature is maintained below the boiling point of liquid nitrogen (the boiling point of liquid nitrogen is -196°C) to extract the depleted krypton and xenon in the liquid oxygen of the oxygen-nitrogen mixed liquid; then, the temperature in the crude argon condenser is raised to the boiling point of liquid nitrogen, and the depleted krypton and xenon in the liquid oxygen (the boiling point of liquid oxygen is -183°C) are extracted. In this way, the depleted krypton and xenon in the liquid oxygen of the oxygen-nitrogen mixed liquid and the depleted krypton and xenon in the pure liquid oxygen are extracted, and the depleted krypton and xenon are extracted in two steps.

[0083] The present invention avoids the reduction of the extraction rate of oxygen and nitrogen products by adjusting the flow rate of the krypton-depleted tower raw material in the crude argon condenser. Since the temperature in the crude argon condenser can be adjusted and the temperature is adjusted and maintained in a low-temperature environment, the low-temperature temperature in the crude argon condenser is adjusted to extract liquid oxygen and liquid nitrogen (because the liquid temperatures of liquid oxygen and liquid nitrogen are different). In the liquid oxygen environment, the flow rate of the krypton-depleted tower raw material entering the crude argon condenser is adjusted according to proportion and time, and the krypton-depleted tower raw material extracts krypton-depleted xenon in the liquid oxygen.

[0084] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for regulating the flow rate of raw materials in a krypton-depleted tower using a crude argon condenser, characterized in that: The steps include: Step 1: Fill the crude argon condenser with oxygen and nitrogen, and adjust the temperature in the crude argon condenser so that the temperature in the crude argon condenser decreases at a rate of 1°C / s; Step 2: During the process of lowering the temperature in the crude argon condenser, the krypton-depleted tower raw material is input into the crude argon condenser, and the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted; Wherein, in the step 2, in the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the flow rate of the krypton-depleted tower raw material added into the crude argon condenser is adjusted by the following steps: Step S1: inputting krypton-depleted tower raw materials into the crude argon condenser as the temperature in the crude argon condenser decreases by 1°C; Step S2: inputting the krypton-depleted tower raw material into the crude argon condenser until the oxygen and nitrogen in the crude argon condenser become liquid; Furthermore, in the step S2, in the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the quality of the input krypton-depleted tower raw material is adjusted by the following steps: Step 00: Calculate the mass of the raw material for the krypton-depleted tower input into the crude argon condenser per second, and adjust the mass of the raw material for the krypton-depleted tower according to the temperature in the crude argon condenser; Step 01: The lower the temperature in the crude argon condenser, the less mass of the raw material for the depleted krypton tower is input into the crude argon condenser; Step 3: After the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature in the crude argon condenser; Step 4: Adjust the temperature in the crude argon condenser to keep the liquid oxygen and liquid nitrogen in liquid state.

2. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 1, characterized in that: In step 1, the temperature in the crude argon condenser is adjusted by a time-temperature adjustment method, and the time-temperature method is the following formula: ； in, is the unit time, is a unit temperature that can be raised or lowered. is the unit temperature increased or decreased in unit time; To increase or decrease the unit temperature per unit time, It is the operation of increasing or decreasing the unit temperature within the unit time; To adjust the unit temperature according to the unit time, is the unit time and unit temperature, is the execution function for adjusting the unit temperature within the unit time; is the recorded temperature, For the recorded time, is the recorded temperature and the recorded time.

3. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 1, characterized in that: In the step S2, in the process of inputting the krypton-depleted tower raw material into the crude argon condenser, the quality of the krypton-depleted tower raw material is adjusted by using a temperature-mass metering method, and the temperature-mass metering method uses the following formula: ； in, is the i-th moment, From the 1st moment to the Nth moment, To select a moment from the 1st moment to the Nth moment; is the temperature in the crude argon condenser at the i-th moment, To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is ; To select the i-th moment from the 1st moment to the Nth moment The temperature in the crude argon condenser is The operation function of For the i-th moment The temperature in the crude argon condenser is , at a temperature of At the same time, the measured value of the raw material mass of the krypton-depleted tower is input into the crude argon condenser.

4. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 1, characterized in that: In the step 3, after the oxygen and nitrogen in the crude argon condenser are respectively liquid oxygen and liquid nitrogen, the input of raw materials to the krypton-depleted tower is stopped to maintain the temperature below the boiling point of liquid nitrogen.

5. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 4, characterized in that: Extracting krypton-depleted xenon from the oxygen-nitrogen mixed liquid in the crude argon condenser, wherein the krypton-depleted xenon from the liquid oxygen is extracted.

6. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 4, characterized in that: The temperature in the crude argon condenser is adjusted to the boiling point of liquid nitrogen, and then the krypton-depleted xenon in the liquid oxygen is extracted.

7. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 6, characterized in that: The temperature in the crude argon condenser is adjusted to the boiling point of liquid oxygen. After the liquid oxygen and liquid nitrogen are oxygen and nitrogen respectively, it is detected whether there is krypton-depleted xenon in the crude argon condenser.

8. The method for regulating the flow rate of raw materials in the krypton-depleted tower by using a crude argon condenser according to claim 1, characterized in that: In step 4, the temperature in the crude argon condenser is adjusted again until the oxygen and nitrogen are in liquid state.

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