Calculation method for argon product extraction rate of air separation device and argon product extraction process

Abstract

The invention relates to the technical field of argon product extraction, in particular to a method for calculating the argon product extraction rate of an air separation device and an argon product extraction process, and the argon loss of the air separation device in the corresponding load state is determined according to the theoretical process argon extraction amount and the actual process argon extraction amount of the air separation device in different load states. Meanwhile, the extraction rates of the process argon in different load states when the air separation device meets the purity requirement of an argon product are determined by using the air consumption, and the extraction amount of the process argon in the air separation device is changed by calculating and adjusting the optimal extraction rate of the process argon, so that the optimal amount of the process argon extracted by the air separation device in different load states is determined; on one hand, the situation that the purity of the process argon does not meet the requirement due to excessive extraction of the process argon is avoided, and on the other hand, the extraction amount of the process argon is maximized while the purity requirement is guaranteed, so that the production requirement is met, the extraction amount of an argon product of the air separation device is increased, the argon content in exhaust gas is reduced, waste is reduced, and production benefits are improved; the actual production requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of argon product extraction, and in particular to a method for calculating the argon product extraction rate of an air separation device and an argon product extraction process. Background Art

[0002] An air separation unit is a set of industrial equipment used to separate the various gas components in the air and obtain oxygen, nitrogen, argon and other gases.

[0003] When extracting argon products, it is usually necessary to roughly separate argon after completing the extraction of liquid oxygen, and then obtain liquid argon with purity that meets the requirements through distillation (according to GB / T8482-2017, the purity volume fraction of high-purity argon is ≥99.999%); for example, the Chinese invention patent with application number 201310179510.5 provides a system and method for increasing the production of liquid argon, which separates nitrogen and argon from argon gas through a refined argon tower to obtain a pure argon product.

[0004] When separating nitrogen and argon from argon gas, the amount of recovered argon is usually adjusted by controlling the opening and closing time of the flow control valve. For example, the Chinese invention patent with application number 202111300398.7 provides a method for preparing liquefied argon by optimizing the start-up time of the argon system. By adjusting the flow in the crude argon tower, the argon fraction content in the crude argon tower can be increased as much as possible while ensuring the oxygen purity.

[0005] However, in actual operation, since the workload of the air separation unit is not constant and the extraction rate of the argon product varies under different workloads, the amount of crude argon obtained when the air separation unit works under different load conditions is different. Argon is extracted from the crude argon by fixing the opening of the flow control valve, which will cause the extraction flow rate to be too large or too small, causing the oxygen content in the argon product to exceed the standard or too much argon to be wasted without being extracted, reducing the extraction amount of the argon product and the quality of the argon product, further reducing the production efficiency, and therefore cannot meet the actual argon product production needs. Summary of the invention

[0006] The purpose of the present invention is to provide a method for calculating the extraction rate of argon products in an air separation unit and an argon product extraction process, so as to solve the current technical problem of low efficiency of argon product extraction due to different working loads of air separation units.

[0007] The present invention solves the above-mentioned technical problems by:

[0008] A method for calculating the extraction rate of argon product of an air separation unit comprises the following steps:

[0009] S1. Determine the load range N of the air separation unit;

[0010] S2. Under any load state of the air separation unit, obtain the process argon extraction flow rate C of the air separation unit;

[0011] S3, setting the collection time T, and obtaining the actual argon extraction amount P in the liquid argon storage tank under the collection time T;

[0012] S4, according to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, obtain the argon extraction deviation coefficient J under the corresponding load state of the air separation unit;

[0013] S5. Determine the actual argon extraction rate K of the air separation unit under the corresponding load state according to the process argon extraction flow rate C, the argon extraction deviation coefficient J and the air flow rate A consumed by the air separation unit under the corresponding load state;

[0014] S6. Adjust the actual argon extraction rate K step by step to obtain multiple argon correction extraction rates K u , according to different argon correction extraction rate K u Determine the purity of argon in the extraction process of the air separation unit, and take the maximum value of all argon corrected extraction rates corresponding to the argon purity of the extraction process as the argon product extraction rate L under the current load state of the air separation unit;

[0015] S7, executing steps S2 to S7 until the argon product extraction rates corresponding to different loads of the air separation unit are obtained.

[0016] It is further defined that step S2 comprises the following steps:

[0017] S2.1. Divide the load range N of the air separation unit into S parts to obtain the load range N of the air separation unit. s , s = 1 ~ S;

[0018] S2.2. Set the load range of the air separation unit to N s Any value in the range is taken as the test load n of the air separation unit s , s = 1 ~ S;

[0019] S2.3. Select an air separation unit test load in order as the current load of the air separation unit;

[0020] S2.4. Obtain the process argon extraction flow C under the current load state of the air separation unit through the gas phase flow meter.

[0021] It is further defined that step S3 comprises the following steps:

[0022] S3.1, set the collection time T;

[0023] S3.2. According to the bottom area f of the liquid argon storage tank and the liquid level rise height H of the liquid argon storage tank under the collection time T T , and obtain the actual argon extraction amount P in the liquid argon storage tank, P = H T f液 , ρ 液 is the density of liquid argon.

[0024] It is further defined that step S4 comprises the following steps:

[0025] S4.1, determine whether the process argon extracted by the air separation unit is in gas phase or liquid phase, if it is in gas phase, execute step S4.2, if it is in liquid phase, execute step S4.3;

[0026] S4.2. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained:

[0027]

[0028] Among them, ρ 气 is the density of gaseous argon;

[0029] S4.3. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained:

[0030]

[0031] Among them, ρ 液 is the density of liquid argon, and E is the volume ratio constant of gaseous argon and liquid argon.

[0032] Further defined, the step S5 is specifically as follows:

[0033] According to the process argon extraction flow C, argon extraction deviation coefficient J and the air flow A consumed by the air separation unit under the corresponding load state, the actual argon extraction rate K of the air separation unit under the corresponding load state is determined:

[0034]

[0035] Where I is the purity of argon in the extraction process, and G is the proportion of argon in the air.

[0036] It is further defined that step S6 comprises the following steps:

[0037] S6.1, Order K u =K+ku, and the argon correction extraction rate K is obtained u , where k is the adjustment amount and u is the number of adjustments;

[0038] S6.2. Correction of extraction rate K based on argon u , calculate the process argon correction extraction flow c of the air separation unit under the corresponding load state u ,

[0039]

[0040] S6.3, the air separation unit corrects the extraction amount c according to the process argon per unit time u Extraction is performed to determine whether the purity of the extracted process argon meets the requirements. If so, u=u+1 is set and steps S6.1 to S6.3 are executed; if not, u=u-1 is set and the obtained argon correction extraction rate K is calculated. u As the argon product extraction rate L under the current load state of the air separation unit.

[0041] It is further defined that step S7 comprises the following steps:

[0042] S7.1, determine whether s is equal to S, if so, execute step S7.2; if not, execute step S7.3;

[0043] S7.2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit;

[0044] S7.3. Let s=s+1, and re-execute steps S2.4 to S7.1.

[0045] It is further defined that step S7 comprises the following steps:

[0046] S7.1, determine whether s is equal to 1, if so, execute step S7.2; if not, execute step S7.3;

[0047] S7.2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit;

[0048] S7.3. Let s=s-1, and re-execute steps S2.4 to S7.1.

[0049] A process for extracting argon products from an air separation unit, based on the above-mentioned method for calculating the extraction rate of argon products from an air separation unit, comprises the following steps:

[0050] Sa, according to the calculation method of the argon product extraction rate of the air separation unit, the argon product extraction rate L corresponding to different load ranges of the air separation unit is obtained;

[0051] Sb, according to the current load state of the air separation unit, determine the load range of the air separation unit and the argon product extraction rate L corresponding to the load range;

[0052] Sc, extracting a corresponding amount of process argon according to the argon product extraction rate L obtained in step Sb;

[0053] Sd. Store the extracted process argon in a liquid argon storage tank to complete the extraction of argon products.

[0054] The beneficial effects of the present invention are:

[0055] The present invention determines the argon loss of the air separation device under the corresponding load state according to the theoretical extraction amount and the actual extraction amount of process argon under different load states of the air separation device, and uses the air consumption to determine the extraction rate of process argon under different load states of the air separation device when the purity requirement of the argon product is met. The extraction amount of process argon of the air separation device is changed by calculating and adjusting the optimal extraction rate of process argon, thereby determining the optimal amount of process argon extracted under different load states of the air separation device; on the one hand, it is avoided that the process argon is over-extracted to cause its purity not meeting the requirement; on the other hand, the extraction amount of process argon is maximized while ensuring the purity requirement, thereby increasing the extraction amount of argon products of the air separation device while meeting the production demand, reducing the argon content in the exhaust gas, reducing waste, improving production efficiency, and meeting the actual production demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 The figure is a step diagram of the method for calculating the argon product extraction rate of the air separation unit of the present invention;

[0057] Figure 2 This is a process diagram of extracting argon products from an air separation unit according to the present invention. DETAILED DESCRIPTION

[0058] Usually, the working load range of the air separation unit is between 70% and 105% of the rated load. When the air separation unit works under different load conditions, the output of the argon product (gas phase argon and liquid phase argon) produced will also change accordingly. At the same time, it is found in actual operation that there is no linear relationship between the load of the air separation unit and the output of argon products. Therefore, after the load of the air separation unit changes, the amount of extracted process argon becomes the key parameter for the output of argon products. Under the same load condition, if the amount of process argon extracted is too large, it will cause the presence of nitrogen, oxygen and other waste gases in the extracted process argon, which will cause the purity of the process argon to fail to meet the requirements (according to GB / T8482-2017, the volume fraction of oxygen (O2) in high-purity argon is ≤1.5*10 -6 , the purity I of the argon product is usually 99.999%), making the product unqualified; therefore, during operation, the extraction rate of process argon is usually set to a relatively low value to ensure the qualified production of argon products under different load conditions, but this will result in some argon not being extracted and discharged with other waste gases such as nitrogen, reducing production and causing energy waste; and when the air separation unit is operated under a higher load state, the set process argon extraction rate is too low to extract the argon in the crude argon in time, which can easily lead to abnormal conditions such as argon aggregation, resulting in problems such as unqualified purity of the oxygen product.

[0059] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in 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.

[0060] Example 1

[0061] refer to Figure 1 This embodiment provides a method for calculating the argon product extraction rate of an air separation unit, comprising the following steps:

[0062] S1. Determine the load range N of the air separation unit;

[0063] S2. Under any load state of the air separation unit, obtain the process argon extraction flow rate C of the air separation unit;

[0064] S3, setting the collection time T, and obtaining the actual argon extraction amount P in the liquid argon storage tank under the collection time T;

[0065] S4, according to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, obtain the argon extraction deviation coefficient J under the corresponding load state of the air separation unit;

[0066] S5. Determine the actual argon extraction rate K of the air separation unit under the corresponding load state according to the process argon extraction flow rate C, the argon extraction deviation coefficient J and the air flow rate A consumed by the air separation unit under the corresponding load state;

[0067] S6. Adjust the actual argon extraction rate K step by step to obtain multiple argon correction extraction rates K u , according to different argon correction extraction rate K u Determine the purity of argon in the extraction process of the air separation unit, and take the maximum value of all argon corrected extraction rates corresponding to the argon purity of the extraction process as the argon product extraction rate L under the current load state of the air separation unit;

[0068] S7, executing steps S2 to S7 until the argon product extraction rates corresponding to different loads of the air separation unit are obtained.

[0069] Further explanation, step S2 includes the following steps:

[0070] S2.1. Divide the load range N of the air separation unit into S parts to obtain the load range N of the air separation unit. s , s = 1 ~ S;

[0071] Specifically, N=[70%, 105%]. The load range N can be divided into multiple parts, such as S=5 or 7. Taking S=5 as an example, the equal division is explained, and the load ranges are N1=[70%, 77%), N2=[77%, 84%), N3=[84%, 91%), N4=[91%, 98%), and N5=[98%, 105%].

[0072] In actual production, multiple load ranges that the air separation unit is often in can be selected as test ranges according to the actual operating status of the air separation unit to adapt to actual production conditions.

[0073] S2.2. Set the load range of the air separation unit to N s Any value in the range is taken as the test load n of the air separation unit s , s = 1 ~ S;

[0074] Specifically, in order to reduce the workload, a load value can be selected in each load range after division for testing. The test value can be selected as the middle value of each load range or a common value in the range. Taking the selection of the middle value as an example, 5 air separation unit test loads n1=73.5%, n2=80.5%, n3=87.5%, n4=94.5%, n5=101.5% are obtained; two test loads can also be selected in the same load range to improve control accuracy.

[0075] S2.3. Select an air separation unit test load in order as the current load of the air separation unit;

[0076] Specifically, for the convenience of testing and also for the convenience of the equipment to smoothly adjust the load state, the test load is usually tested one by one from the highest value to the lowest value, or from the lowest value to the highest value. This embodiment is described by taking n1 as an example.

[0077] S2.4. Obtain the process argon extraction flow C under the current load state of the air separation unit through the gas phase flow meter.

[0078] Specifically, the rated load of the air separation unit is 59000Nm 3 / h(O2) as an example, that is, when the air separation unit is 100% loaded, the extraction flow rate of oxygen product is 59000Nm 3 / h, the extraction flow is collected through the gas phase flow meter, and the process argon extraction flow C (unit: Nm 3 / h) and consumed air flow A (in Nm 3 ).

[0079] To further illustrate, step S3 includes the following steps:

[0080] S3.1, set the collection time T;

[0081] Specifically, after obtaining the process argon extraction flow C, it is necessary to obtain the process argon volume obtained by the air separation unit running for a period of time under the current load state. At this time, T can be selected as 1h, 8h or 24h, and T=24h is taken as an example for explanation.

[0082] S3.2. According to the bottom area f of the liquid argon storage tank and the liquid level rise height H of the liquid argon storage tank under the collection time T T , and obtain the actual argon extraction amount P in the liquid argon storage tank, P = H T f 液 , ρ 液 is the density of liquid argon.

[0083] Specifically, the process argon needs to be stored after extraction. Usually, the process argon is stored in a liquid argon storage tank in the form of liquid argon. The liquid argon storage tank is a cylindrical structure. Therefore, the volume of liquid argon storage needs to be obtained. The volume can be calculated by the bottom area f (in m2) of the liquid argon storage tank. 2 ) and the air separation unit under load condition n1, the liquid level height change H in the liquid argon storage tank during 24h operation T (unit: m), and the actual argon extraction amount P (unit: t (ton)), P = H T f 液 , the density of liquid argon is selected as 1.4t / m 3 .

[0084] The amount of liquid argon extracted during the corresponding collection time can also be obtained by obtaining the percentage change of the liquid level in the liquid argon storage tank according to the actual operating status; at this time, the liquid argon volume corresponding to each 1% liquid level in the liquid argon storage tank and the percentage change of the liquid argon liquid level during the collection time are determined, and the actual argon extraction amount P is obtained in combination with the density of liquid argon.

[0085] Further explanation, step S4 includes the following steps:

[0086] S4.1, determine whether the process argon extracted by the air separation unit is in gas phase or liquid phase, if it is in gas phase, execute step S4.2, if it is in liquid phase, execute step S4.3;

[0087] Specifically, due to different processes, process argon can be in the form of liquid or gas when it is extracted, so its form is judged.

[0088] S4.2. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained:

[0089]

[0090] Among them, ρ 气 is the density of argon in gas phase.

[0091] Specifically, the process argon extraction flow rate C is the gas phase argon flow rate. Therefore, by comparing the process argon extraction amount with the actual amount of stored liquid argon, the argon extraction deviation coefficient J formed by the vaporization of liquid argon and other forms of argon loss in the actual storage process can be obtained; for example, the process argon extraction flow rate C under the n1 load state is 1280.35Nm 3 / h,ρ 气 The value is 1.784kg / m 3 Under the n1 load state, the actual argon extraction amount P in 24 hours is 49.67t, and the argon extraction deviation coefficient J under the n1 load state is 0.906.

[0092] S4.3. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained:

[0093]

[0094] Among them, ρ 液 is the density of liquid argon, and E is the volume ratio constant of gaseous argon and liquid argon.

[0095] Specifically, since the process argon extraction flow C is measured by a gas phase flow meter, it is necessary to convert argon gas to liquid argon during calculation. At this time, the value of E can be 784.75.

[0096] Further defined, step S5 is specifically as follows:

[0097] According to the process argon extraction flow C, argon extraction deviation coefficient J and the air flow A consumed by the air separation unit under the corresponding load state, the actual argon extraction rate K of the air separation unit under the corresponding load state is determined:

[0098]

[0099] Wherein, I is the purity of argon in the extraction process, G is the proportion of argon in the air, and G is 0.934%.

[0100] Specifically, the actual argon extraction rate K of the air separation unit under the n1 load state is calculated by the ratio of the actual argon product amount to the argon in the consumed air at the same time. The actual argon extraction rate K calculated is usually an empirical value, which is conservative and easily causes more argon exhaust waste; at this time, the air flow rate consumed under the current load state A = 206992.8Nm 3 / h, the actual argon extraction rate K is calculated to be 60%.

[0101] To further illustrate, step S6 includes the following steps:

[0102] S6.1, Order K u =K+ku, and the argon correction extraction rate K is obtained u , where k is the adjustment amount and u is the number of adjustments;

[0103] Specifically, in order to avoid waste and increase the argon extraction amount to increase production, the actual argon extraction rate K can be increased step by step to obtain the argon correction extraction rate K u , k can be selected according to actual needs, k can be selected from 0.05% to 0.15%. The smaller the k value, the higher the number of tests, but the more accurate the result. Take k = 0.1% as an example, starting with u = 1, and the argon correction extraction rate K1 = 60.1%. At this time, u is a positive integer.

[0104] S6.2. Correction of extraction rate K based on argon u , calculate the process argon correction extraction flow c of the air separation unit under the corresponding load state u ,

[0105]

[0106] Specifically, the extraction flow rate of process argon in the air separation unit is calculated according to the argon correction extraction rate of 60.1% while maintaining the load of n1. Since the operating load remains unchanged, when the extraction rate is increased, the extraction flow rate of process argon is increased, and the output of argon products is increased in the same time. At this time, c1=1282.49Nm3 / h is obtained, which is compared with the process argon extraction flow rate C=1280.35Nm3 / h under the load of n1. 3 / h increased.

[0107] S6.3, the air separation unit corrects the extraction amount c according to the process argon per unit time u Extraction is performed to determine whether the purity of the extracted process argon meets the requirements. If so, u=u+1 is set and steps S6.1 to S6.3 are executed; if not, u=u-1 is set and the obtained argon correction extraction rate K is calculated. u As the argon product extraction rate L under the current load state of the air separation unit.

[0108] Specifically, since increasing the extraction flow rate of process argon too much will reduce the purity of the argon product, it is necessary to conduct purity testing on the process argon obtained after readjustment. If the purity meets the requirements, it means that the argon correction extraction rate K1 meets the production requirements. At this time, the argon correction extraction rate K can be further increased. u Then, the test is performed, i.e., u=u+1=2, and then the process argon purity corresponding to the argon correction extraction rate of 60.2% is tested, and this process is repeated until the process argon purity does not meet the requirements when u=U; at this time, u=u-1=U-1, for example, U=121, at this time u=120, and the argon correction extraction rate K is obtained. u =K120 =72%, the argon correction extraction rate K 120 As the argon product extraction rate L.

[0109] At this time, calculate the process argon correction extraction flow c of the air separation unit under the corresponding load state 120 =1536.42Nm3 / h. When the air separation unit is under the load condition of n1=73.5%, the process argon extraction is carried out at the argon product extraction rate L, that is, while meeting the purity requirements of the argon product, the argon product output is maximized. Under the current load condition, the process argon extraction flow rate is increased by 20%, and the argon product produced by a single air separation unit increases by 9.9t / day, thereby improving production efficiency.

[0110] Further explanation, step S7 includes the following steps:

[0111] S7.1, determine whether s is equal to S, if so, execute step S7.2; if not, execute step S7.3;

[0112] S7.2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit;

[0113] S7.3. Let s=s+1, and re-execute steps S2.4 to S7.1.

[0114] Alternatively, step S7 includes the following steps:

[0115] S7.1, determine whether s is equal to 1, if so, execute step S7.2; if not, execute step S7.3;

[0116] S7.2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit;

[0117] S7.3. Let s=s-1, and re-execute steps S2.4 to S7.1.

[0118] Specifically, after completing the test under the load state n1, it is determined whether s is equal to S to complete the test of n1~n S or s ~n S All load tests; by judging whether s is equal to 1, it is used to complete n S ~n1 or n s ~n1 Test of all loads.

[0119] Example 2

[0120] refer to Figure 2 Based on the calculation method of the argon product extraction rate of the air separation unit provided in Example 1, this embodiment provides an argon product extraction process for an air separation unit, the purpose of which is to increase the extraction amount of the argon product, including the following steps:

[0121] Sa, according to the calculation method of the argon product extraction rate of the air separation unit, the argon product extraction rate L corresponding to different load ranges of the air separation unit is obtained;

[0122] Sb, according to the current load state of the air separation unit, determine the load range of the air separation unit and the argon product extraction rate L corresponding to the load range;

[0123] Sc, extracting a corresponding amount of process argon according to the argon product extraction rate L obtained in step Sb;

[0124] Sd. Store the extracted process argon in a liquid argon storage tank to complete the extraction of argon products.

[0125] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the present invention.

Claims

1. A method for calculating the argon product extraction rate of an air separation unit, characterized in that: The following steps are involved: S1. Determine the load range N of the air separation unit; S2. Under any load state of the air separation unit, obtain the process argon extraction flow rate C of the air separation unit; S3, setting the collection time T, and obtaining the actual argon extraction amount P in the liquid argon storage tank under the collection time T; S4, according to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, obtain the argon extraction deviation coefficient J under the corresponding load state of the air separation unit; S5. Determine the actual argon extraction rate K of the air separation unit under the corresponding load state according to the process argon extraction flow rate C, the argon extraction deviation coefficient J and the air flow rate A consumed by the air separation unit under the corresponding load state; S6. Adjust the actual argon extraction rate K step by step to obtain multiple argon correction extraction rates K u , according to different argon correction extraction rate K u Determine the purity of argon in the extraction process of the air separation unit, and take the maximum value of all argon corrected extraction rates corresponding to the argon purity of the extraction process as the argon product extraction rate L under the current load state of the air separation unit; S7, executing steps S2 to S7 until the argon product extraction rates corresponding to different loads of the air separation unit are obtained.

2. The method for calculating the argon product extraction rate of an air separation unit according to claim 1, characterized in that: The step S2 comprises the following steps: S2.

1. Divide the load range N of the air separation unit into S parts to obtain the load range N of the air separation unit. s , s = 1 ~ S; S2.

2. Set the load range of the air separation unit to N s Any value in the range is taken as the test load n of the air separation unit s , s = 1 ~ S; S2.

3. Select an air separation unit test load in order as the current load of the air separation unit; S2.

4. Obtain the process argon extraction flow C under the current load state of the air separation unit through the gas phase flow meter.

3. The method for calculating the argon product extraction rate of an air separation unit according to claim 2, characterized in that: The step S3 comprises the following steps: S3.1, set the collection time T; S3.

2. According to the bottom area f of the liquid argon storage tank and the liquid level rise height H of the liquid argon storage tank under the collection time T T , and obtain the actual argon extraction amount P in the liquid argon storage tank, P = H T f 液 , ρ 液 is the density of liquid argon.

4. The method for calculating the argon product extraction rate of an air separation unit according to claim 3, characterized in that: The step S4 comprises the following steps: S4.1, determine whether the process argon extracted by the air separation unit is in gas phase or liquid phase, if it is in gas phase, execute step S4.2, if it is in liquid phase, execute step S4.3; S4.

2. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained: Among them, ρ 气 is the density of gaseous argon; S4.

3. According to the acquisition time T, the process argon extraction flow rate C and the actual argon extraction amount P under the corresponding time, the argon extraction deviation coefficient J under the corresponding load state of the air separation unit is obtained: Among them, ρ 液 is the density of liquid argon, and E is the volume ratio constant of gaseous argon and liquid argon.

5. The method for calculating the argon product extraction rate of an air separation unit according to claim 4, characterized in that: The step S5 is specifically as follows: According to the process argon extraction flow C, argon extraction deviation coefficient J and the air flow A consumed by the air separation unit under the corresponding load state, the actual argon extraction rate K of the air separation unit under the corresponding load state is determined: Where I is the purity of argon in the extraction process, and G is the proportion of argon in the air.

6. The method for calculating the argon product extraction rate of an air separation unit according to claim 5, characterized in that: The step S6 comprises the following steps: S6.1, let K u =K+ku, and the argon correction extraction rate K is obtained u , where k is the adjustment amount and u is the number of adjustments; S6.

2. Correction of extraction rate K based on argon u , calculate the process argon correction extraction flow c of the air separation unit under the corresponding load state u , S6.3, the air separation unit corrects the extraction amount c according to the process argon per unit time u Extraction is performed to determine whether the purity of the extracted process argon meets the requirements. If so, u=u+1 is set and steps S6.1 to S6.3 are executed; if not, u=u-1 is set and the obtained argon correction extraction rate K is calculated. u As the argon product extraction rate L under the current load state of the air separation unit.

7. The method for calculating the argon product extraction rate of an air separation unit according to claim 6, characterized in that: The step S7 comprises the following steps: S7.1, determine whether s is equal to S, if so, execute step S7.2; if not, execute step S7.3; S7.

2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit; S7.

3. Let s=s+1, and re-execute steps S2.4 to S7.

1.

8. The method for calculating the argon product extraction rate of an air separation unit according to claim 6, characterized in that: The step S7 comprises the following steps: S7.1, determine whether s is equal to 1, if so, execute step S7.2; if not, execute step S7.3; S7.

2. Complete the calculation of argon product extraction rate under different load conditions of the air separation unit; S7.

3. Let s=s-1, and re-execute steps S2.4 to S7.

1.

9. A process for extracting argon product from an air separation unit, characterized in that: The method for calculating the argon product extraction rate of the air separation unit according to claim 7 or 8 comprises the following steps: Sa, according to the calculation method of the argon product extraction rate of the air separation unit, the argon product extraction rate L corresponding to different load ranges of the air separation unit is obtained; Sb, according to the current load state of the air separation unit, determine the load range of the air separation unit and the argon product extraction rate L corresponding to the load range; Sc, extracting a corresponding amount of process argon according to the argon product extraction rate L obtained in step Sb; Sd. Store the extracted process argon in a liquid argon storage tank to complete the extraction of argon products.

Images