1af metering tank liquid volume measurement method and application thereof

Abstract

The present application relates to the technical field of spent fuel reprocessing, in particular to a kind of 1AF metering tank material liquid volume measuring method and application thereof, wherein, 1AF metering tank material liquid volume measuring method includes the following steps: first, using piecewise density measurement method, the interval density of each subsection of 1AF metering tank can be accurately measured, so that density measurement is more accurate and effective, so that the state of material liquid in 1AF metering tank can be more truly reacted;Then, using the obtained interval density and pressure value, the corresponding liquid level height is obtained, and the liquid level height is brought into the mathematical model of volume-liquid level height of the corresponding subsection, so that the volume of 1AF metering tank material liquid can be obtained.The measuring method fully considers the influence of the density of material liquid in different subsection intervals in 1AF metering tank on volume, not only makes the density measurement of material liquid in different subsection intervals in 1AF metering tank more accurate, but also assists the accurate measurement of 1AF metering tank material liquid volume.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spent fuel reprocessing, in particular to a 1AF metering tank liquid volume measurement method and application thereof. BACKGROUND

[0002] Spent fuel, also known as irradiated nuclear fuel, is a used nuclear fuel that has been subjected to radiation, usually generated by a nuclear reactor of a nuclear power plant, and contains a large amount of radioactive elements, which is radioactive. If not properly handled, it will seriously affect the environment and the health of people in contact with it. Therefore, spent fuel reprocessing is a key link to realize the closed cycle of nuclear fuel.

[0003] In spent fuel reprocessing, nuclear material accounting is an important basis for nuclear material control, cost accounting, process control and quality assurance. Among them, 1AF liquid is one of the key measurement points of nuclear material accounting in reprocessing, and the precision metering tank is a key equipment for precise measurement of 1AF liquid. The accuracy and structure of the equipment have an important influence on the accuracy and safety of nuclear material accounting in the entire reprocessing process.

[0004] At present, the 1AF metering tank used in domestic test scale and industrial scale reprocessing plants has only one set of density measurement blow pipe line for average density measurement of the 1AF metering tank. However, due to the increase of internal height and cross-sectional area of the 1AF metering tank in the 1:1 scale of the commercial spent fuel reprocessing plant, the number of internal components also increases. At this time, the density measurement in the 1AF metering tank is not only the overall density measurement, but also the segmented density measurement in each section to make the density measurement more accurate and effective. Therefore, the previous simple straight cylinder section volume measurement method is no longer applicable.

[0005] In view of the above problems, the present application provides a density measurement method suitable for each measurement section of the 1AF metering tank of the 1:1 scale of the commercial spent fuel reprocessing plant to assist the accurate measurement of the liquid volume of the 1AF metering tank. SUMMARY

[0006] The purpose of the present application is to provide a 1AF metering tank liquid volume measurement method and application thereof, which can precisely measure the density of each section of the 1AF metering tank, and further realize the accurate measurement of the liquid volume of the 1AF.

[0007] The present application provides a 1AF metering tank liquid volume measurement method, comprising the following steps: using a segmented density measurement method to measure the interval density of each section of the 1AF metering tank, and bringing the interval density into a mathematical model of the volume-liquid level height of each section of the 1AF metering tank to obtain the liquid volume of the 1AF metering tank.

[0008] As a preferred technical solution of the present application, it specifically comprises the following steps:

[0009] S1, a mathematical model of volume-liquid level height of each section of the 1AF metering tank is established;

[0010] S2, interval density and pressure of each section of the 1AF metering tank are measured by using the sectional density measurement method, and the liquid level height is obtained;

[0011] S3, the liquid level height is brought into the mathematical model of volume-liquid level height of the corresponding section, and the volume of the 1AF metering tank is obtained.

[0012] As a preferred technical solution, in step S1, the liquid level height and the calibration volume are obtained by calibration test using the principle of hydrostatic pressure, and after statistical analysis and processing, the mathematical model of volume-liquid level height of each section of the 1AF metering tank is established.

[0013] As a preferred technical solution, in step S2, the sectional density measurement method includes: according to the principle of density blow measurement, the first blow pipe and the second blow pipe for measuring interval density are arranged at the upper and lower liquid level limits of the sectional interval respectively, the first blow pipe and the second blow pipe cooperate with the reference pipe, and the measurement of the interval density of the sectional material liquid is completed by blow measurement. The detection method of blow measurement is used for sectional density measurement of the nuclear material liquid in the 1AF metering tank, which has the characteristics of maintenance-free and easy operation. Compared with the method of opening holes in the side wall of the metering tank, the vertical insertion type measurement pipeline is used, which further ensures the accuracy of the metering of the metering tank.

[0014] As a preferred technical solution, in step S2, the calculation formula of the interval density is as follows:

[0015] ρ 1，2 =(P1-P2) / S×g

[0016] Wherein, P1 is the pressure in the first blow pipe;

[0017] P2 is the pressure in the second blow pipe;

[0018] S is the distance between the pipe orifice of the first blow pipe and the pipe orifice of the second blow pipe;

[0019] g is the acceleration of gravity;

[0020] ρ 1，2 is the interval density of the sectional interval material liquid.

[0021] The reference pipe used in cooperation is used to exclude the influence of the gas phase pressure at the upper part of the metering tank, therefore, the calculation formula of the interval density is as follows:

[0022] ρ 1，2 =(ΔP1-ΔP2) / S×g

[0023] = {(P1-P r )-(P2-P r )} / S×g

[0024] = (P1-P2) / S×g

[0025] As the preferred technical solution, in step S2, the calculation formula of the liquid level height is as follows:

[0026] H = P / ρ×g

[0027] Wherein, P is the pressure corresponding to the liquid level;

[0028] ρ is the interval density of the material liquid in the interval where the liquid level is located;

[0029] g is the acceleration of gravity;

[0030] H is the liquid level height.

[0031] As the preferred technical solution, in step S2, the first blowing pipe is arranged below the upper limit liquid level of the segmented interval, and the second blowing pipe is arranged above the lower limit liquid level of the segmented interval. In order to ensure that the pipe openings of the first blowing pipe and the second blowing pipe are located below the liquid surface.

[0032] When the liquid in the metering tank simultaneously immerses the pipe openings of the density measuring pipelines of each segment, the real-time density measurement of each segment can be realized, therefore, the upper and lower limits of each segmented interval of the 1AF metering tank are respectively provided with blowing pipes.

[0033] As the preferred technical solution, three segmented intervals are arranged in the 1AF metering tank.

[0034] When the above measurement method is applied to the measurement of the liquid volume of the 1AF metering tank of the 1:1 scale of the commercial spent fuel reprocessing plant, the problem that the simple straight cylinder segment full interval volume measurement is not applicable and inaccurate due to the increase of the internal height and cross-sectional area of the 1AF metering tank of the 1:1 scale of the commercial spent fuel reprocessing plant and the increase of the internal components is effectively solved. Therefore, the application of the above 1AF metering tank liquid volume measurement method in the measurement of the liquid volume of the 1AF metering tank of the 1:1 scale of the commercial spent fuel reprocessing plant also belongs to the protection scope of the present application.

[0035] The 1AF metering tank liquid volume measurement method of the present application has at least the following technical effects:

[0036] In the 1AF measuring tank liquid volume measurement method of the present application, first, the segmented density measurement method is used to realize accurate measurement of the interval density of each segment of the 1AF measuring tank, so that the density measurement is more accurate and effective, so that the state of the material liquid in the 1AF measuring tank can be more truly reflected; then, the obtained interval density and pressure value are used to obtain the corresponding liquid level height, which is brought into the volume-liquid level height mathematical model of the corresponding segment, so that the 1AF measuring tank liquid volume can be obtained. The measurement method fully considers the influence of the density of the material liquid in different segmented intervals in the 1AF measuring tank on the volume, not only makes the density measurement of the material liquid in different segmented intervals in the 1AF measuring tank more accurate, but also assists the accurate measurement of the 1AF measuring tank liquid volume. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0038] Figure 1 The measurement schematic diagram of the 1AF measuring tank segmented material liquid interval density of the present application;

[0039] Figure 2 The measurement schematic diagram of the 1AF measuring tank segmented material liquid interval density of the present application;

[0040] Reference signs:

[0041] 1: first blowing pipe; 2: second blowing pipe; 3: A blowing pipe; 4: B blowing pipe; 5: C blowing pipe; 6: D blowing pipe; 7: E blowing pipe; 8: F blowing pipe; 9: G blowing pipe. DETAILED DESCRIPTION

[0042] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0043] It should be noted that the terms used herein are only for the purpose of describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form also includes the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0044] The technical solutions of the present application will be clearly and completely described below in connection with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0045] Embodiment 1

[0046] According to the structure of the metering tank in the post-processing plant of commercial scale, the 1AF metering tank is divided into a first subsection, a second subsection and a third subsection from bottom to top. After determining the measurement interval of the subsection metering, a series of liquid level values obtained through calibration test and the corresponding known calibration volume are standardized, and then subjected to statistical analysis processing, and the mathematical models of the first subsection volume-liquid level height, the second subsection volume-liquid level height and the third subsection volume-liquid level height are respectively established according to the ISO 18213.1-6 standard.

[0047] Embodiment 2

[0048] As shown in Figure 1 , according to the principle of density blow gas measurement, the first blow gas pipe 1 and the second blow gas pipe 2 for measuring the density of the interval are arranged at the upper and lower liquid level limits of the subsection interval, respectively, wherein the first blow gas pipe 1 is arranged below the upper limit liquid level of the subsection interval, the second blow gas pipe 2 is arranged above the lower limit liquid level of the subsection interval, and the first blow gas pipe 1 and the second blow gas pipe 2 cooperate with the reference pipe to complete the measurement of the density of the subsection liquid interval by blow gas measurement method.

[0049] And the calculation formula of the interval density is as follows:

[0050] ρ 1，2 =(P1-P2) / S×g

[0051] Wherein, P1-the pressure in the first blow gas pipe 1;

[0052] P2-the pressure in the second blow gas pipe 2;

[0053] S-the distance between the pipe opening of the first blow gas pipe 1 and the pipe opening of the second blow gas pipe 2;

[0054] g-acceleration of gravity;

[0055] ρ 1，2 -the interval density of the subsection interval liquid.

[0056] Thus, the average density of each subsection interval liquid can be accurately measured.

[0057] Embodiment 3

[0058] The volume of the liquid in the 1AF metering tank of the segmented commercial spent fuel reprocessing plant 1:1 scale is measured.

[0059] According to the structure of the metering tank in the commercial scale reprocessing plant, the 1AF metering tank is divided into the first segment, the second segment and the third segment from bottom to top. After determining the measurement interval of the segmented measurement, the blow pipe for measuring the density of the interval is arranged at the upper and lower liquid level limits of the interval according to the principle of density blow measurement.

[0060] As shown in Figure 2 , the G blow pipe 9 is the reference pipe of the remaining blow pipes, the A blow pipe 3 is located above the lower limit of the liquid level of the first segment, the B blow pipe 4 is located below the upper limit of the liquid level of the first segment, the A blow pipe 3 and the B blow pipe 4 cooperate with the reference pipe, and the real-time measurement of the average density of the liquid between the pipe opening of the A blow pipe 3 and the pipe opening of the B blow pipe 4 is completed by the blow measurement method, that is, ρ A，B .

[0061] The C blow pipe 5 is located above the lower limit of the liquid level of the second segment, the D blow pipe 6 is located below the upper limit of the liquid level of the second segment, the C blow pipe 5 and the D blow pipe 6 cooperate with the reference pipe, and the real-time measurement of the average density of the liquid between the pipe opening of the C blow pipe 5 and the pipe opening of the D blow pipe 6 is completed by the blow measurement method, that is, ρ C，D .

[0062] The E blow pipe 7 is located above the lower limit of the liquid level of the second segment, the F blow pipe 8 is located below the upper limit of the liquid level of the second segment, the E blow pipe 7 and the F blow pipe 8 cooperate with the reference pipe, and the real-time measurement of the average density of the liquid between the pipe opening of the C blow pipe 5 and the pipe opening of the D blow pipe 6 is completed by the blow measurement method, that is, ρ E，F .

[0063] When the liquid level of the liquid in the 1AF metering tank is at the upper limit of the first segment, the following formula is used to calculate the true height of the liquid level in the 1AF metering tank when calculating the liquid level height:

[0064] H=P A / ρ A，B ×g

[0065] Wherein, P is the pressure corresponding to the liquid level, that is, the pressure measured by the A blow pipe 3;

[0066] ρ A，B is the interval density of the liquid in the first segment interval where the liquid level is located;

[0067] g is the acceleration of gravity;

[0068] H is the liquid level height.

[0069] Then, the liquid level height is brought into the mathematical model of the volume-liquid level height of the first segment to obtain the volume of the liquid in the 1AF metering tank.

[0070] When the liquid level in the 1AF metering tank is at the upper limit of the second segment, the true height of the liquid in the 1AF metering tank is calculated using the following formula to calculate the liquid level height:

[0071] H = P A / p A，D x g

[0072] Wherein, P - the pressure corresponding to the liquid level, that is, the pressure measured by the A blow pipe 3;

[0073] p A，D - the interval density of the liquid in the first segment and the second segment interval;

[0074] g - the acceleration of gravity;

[0075] H - liquid level height.

[0076] Then, the liquid level height is brought into the mathematical model of the volume-liquid level height of the second segment, and the volume of the liquid in the 1AF metering tank is obtained.

[0077] When the liquid level in the 1AF metering tank is at the upper limit of the third segment, the true height of the liquid in the 1AF metering tank is calculated using the following formula to calculate the liquid level height:

[0078] H = P A / p A，F x g

[0079] Wherein, P - the pressure corresponding to the liquid level, that is, the pressure measured by the A blow pipe 3;

[0080] p A，F - the interval density of the liquid in the 1AF metering tank;

[0081] g - the acceleration of gravity;

[0082] H - liquid level height.

[0083] Then, the liquid level height is brought into the mathematical model of the volume-liquid level height of the third segment, and the volume of the liquid in the 1AF metering tank is obtained.

[0084] The volume measurement model of the 1AF metering tank of the commercial scale post-treatment plant meeting the design requirements is programmed into the measurement and control system. When the liquid in the 1AF metering tank simultaneously immerses the density measurement pipeline nozzles of each segment, the interval density of each segment can be measured in real time.

[0085] Since the density measurement pipeline is distributed at the upper and lower limits of the measurement interval, the density measurement covers the entire measurement interval as much as possible, so the measured average density is more true and reliable, and each segment density is measured independently, without mutual interference.

[0086] Compare with Example 1

[0087] For the 1AF metering tank as a whole, a mathematical model of volume-liquid level height was established with reference to ISO18213.1-6 standard;

[0088] The interval density ρ of the second-segment feed solution is used. C，D As the average density of any segment of the 1AF metering cell;

[0089] Regardless of whether the liquid level in the 1AF metering tank is at the upper limit of the first, second, or third segment, the following formula is used to calculate the true height of the liquid in the 1AF metering tank when calculating the liquid level height:

[0090] H = P A / ρ C，D ×g

[0091] Wherein, P is the pressure corresponding to the liquid level, which is also the pressure measured by the air blowing pipe 3 (A).

[0092] ρ C，D —The average density between the opening of air pipe 5 (C) and the opening of air pipe 6 (D).

[0093] g—acceleration due to gravity;

[0094] H—Liquid level height.

[0095] Then, the liquid level is substituted into the volume-liquid level mathematical model to obtain the volume of the corresponding liquid in the 1AF metering tank.

[0096] However, regardless of whether the liquid level in the 1AF metering tank is at the upper limit of the first, second, or third segment, ρ is used when calculating the liquid level height. C，D The liquid level height is calculated by using the average density of any segment of the 1AF metering tank. Therefore, the calculated liquid volume has a large deviation.

[0097] In summary, this invention achieves precise measurement of the 1AF liquid volume by measuring the density of each segment of the precision metering 1AF metering tank. Compared with existing technologies, this greatly improves the accuracy of liquid volume measurement in 1AF metering tanks at a 1:1 scale in commercial spent fuel reprocessing plants.

[0098] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for measuring the volume of liquid in a 1AF metering tank, characterized in that, 1. Includes the following steps: S1. Establish a mathematical model of the volume-liquid level height of each segment of the 1AF metering tank; S2. Using the segmented density measurement method, the density and pressure of each segment of the 1AF metering tank are measured to obtain the liquid level height. S3. Substitute the liquid level height into the mathematical model of volume-liquid level height for the corresponding segment to obtain the liquid volume of the 1AF metering tank. In step S2, the segmented density measurement method includes: according to the principle of density blowing measurement, the first blowing pipe and the second blowing pipe for measuring the density of the segment are respectively arranged at the upper and lower liquid level limits of the segmented segment. The first blowing pipe and the second blowing pipe, together with the reference pipe, complete the measurement of the density of the segmented liquid segment by blowing measurement method. Air blowing pipes are respectively arranged at the upper and lower limits of each segment interval of the 1AF metering tank; The 1AF metering tank is divided into three segments.

2. The method for measuring the liquid volume of the 1AF metering tank according to claim 1, characterized in that, In step S1, the liquid level height and calibration volume are obtained through calibration tests using the principle of hydrostatic pressure. After statistical analysis and processing, a mathematical model of the volume-liquid level height of each segment of the 1AF metering tank is established.

3. The method for measuring the liquid volume of the 1AF metering tank according to claim 1, characterized in that, In step S2, the formula for calculating the interval density is as follows: ρ 1，2 =(P1-P2) / S×g Wherein, P1 is the pressure in the first air blowing tube; P2—Pressure in the second air blowing tube; S—the distance between the opening of the first air blowing tube and the opening of the second air blowing tube; g—acceleration due to gravity; ρ 1，2 —The density of the liquid in the segmented intervals.

4. The method for measuring the volume of liquid in the 1AF metering tank according to claim 1, characterized in that, In step S2, the formula for calculating the liquid level height is as follows: H=P / ρ×g Where P is the pressure corresponding to the liquid level; ρ—the density of the liquid within the range where the liquid level is located; g—acceleration due to gravity; H—Liquid level height.

5. The method for measuring the volume of liquid in the 1AF metering tank according to claim 1, characterized in that, In step S2, the first air blowing pipe is positioned below the upper limit liquid level of the segmented section, and the second air blowing pipe is positioned above the lower limit liquid level of the segmented section.

6. The application of the 1AF metering tank liquid volume measurement method according to any one of claims 1-5, characterized in that, The method for measuring the liquid volume of 1AF metering tanks is applied in the measurement of liquid volume of 1AF metering tanks at a 1:1 scale in a commercial spent fuel reprocessing plant.

Images