A probe and device for real-time measurement of collapse liquid level in a core high temperature and high pressure environment

Abstract

The present invention discloses a real-time measurement probe and device for collapse liquid level in a core high-temperature and high-pressure environment. A single liquid level measurement probe is assembled and arranged inside a channel to be measured and does not contact the inner wall of the channel. The liquid level measurement probe includes a bottom support frame, a semi-cylindrical electrode shell, a short cylinder, a straight electrode wire, an inner-cylinder support frame, and a top support frame. The bottom support frame, the semi-cylindrical electrode shell, the short cylinder, the straight electrode wire, the inner-cylinder support frame, and the top support frame are coaxially connected in sequence from bottom to top; the straight electrode wire is located inside the semi-cylindrical electrode shell, and is kept in parallel and non-contact with each other by the bottom support frame, the inner-cylinder support frame, and the top support frame. The semi-cylindrical electrode shell and the straight electrode wire are spaced equally to form a probe body; the straight electrode wire serves as one pole, and the semi-cylindrical electrode shell serves as the other pole, which are led out by wires and connected to a circuit respectively, to form two poles for probe signal transmission, thereby realizing signal transmission and reception.

Description

Technical Field

[0001] The present invention relates to the technical field of multiphase flow parameter measurement, and in particular to a probe and device for real-time measurement of collapse liquid level in a core high-temperature and high-pressure environment. Background Art

[0002] To achieve energy conservation and emission reduction, nuclear energy, as a clean and efficient energy source, has broad potential for development, but its safety is subject to strict requirements. The coolant level in a nuclear reactor is a critical safety parameter, and in the event of a pressure vessel rupture accident, real-time measurement of the collapse level is even more crucial to reflect the cooling status of the core. When a rupture accident occurs, the pressure, temperature, and medium density within the core change dramatically, causing the coolant to flash and form a steam-water two-phase mixture. The medium ejection at the rupture site generates pressure waveform vibrations that can propagate throughout the pressure vessel, making accurate measurement of the coolant collapse level extremely difficult. In addition, the high temperature and high pressure environment within the core and the complex, narrow internal channel structure also limit the use of many measuring instruments.

[0003] In summary, there is an urgent need to develop a measuring device that can measure the collapse liquid level in the core under high temperature and high pressure environment, so as to achieve high-resolution real-time measurement of the coolant level in the core. Summary of the Invention

[0004] In order to overcome the deficiencies in the prior art, the present invention provides a probe and device for real-time measurement of the collapse liquid level in a high-temperature and high-pressure environment of the core, which can achieve high-resolution real-time measurement of the coolant level in the core.

[0005] In order to achieve the above-mentioned purpose of the invention, the technical solutions adopted to solve the technical problems are as follows:

[0006] The present invention discloses a real-time measurement probe for collapse liquid level in a core high-temperature and high-pressure environment. A single liquid level measurement probe is assembled and arranged inside a channel to be measured and does not contact the inner wall of the channel. The liquid level measurement probe includes a bottom support frame, a semi-cylindrical electrode shell, a short cylinder, a straight electrode wire, an inner support frame, and a top support frame, wherein:

[0007] The bottom support frame, the semi-cylindrical electrode shell, the short cylinder, the straight electrode wire, the inner support frame of the cylinder and the top support frame are coaxially connected in sequence from bottom to top;

[0008] The straight electrode wire is located inside the semi-cylindrical electrode shell and is maintained in parallel and non-contact by the bottom support frame, the inner support frame and the top support frame. The semi-cylindrical electrode shell and the straight electrode wire are spaced equidistantly to form a probe body.

[0009] The straight electrode wire serves as one pole, and the semi-cylindrical electrode shell serves as the other pole, which are led out by wires and connected to circuits respectively, to form two poles of probe signal transmission, thereby realizing signal transmission and reception.

[0010] Furthermore, the semi-cylindrical electrode shell comprises N complete short cylinders, where N is an integer not less than 2;

[0011] The spacing between the several complete short cylinders on the semi-cylindrical electrode shell is equal, the short cylinders do not deform during the cutting process, and the cutting line does not deflect.

[0012] Preferably, the semi-cylindrical electrode shell and the straight electrode wire are both made of the same stainless steel 304. The semi-cylindrical electrode shell is made by cutting a complete metal tube from the middle, and the straight electrode wire is a straight rod-shaped metal wire.

[0013] Furthermore, the surface of the semi-cylindrical electrode shell and the straight electrode wire is coated with a layer of high-temperature resistant hydrophobic conductive metal film of uniform thickness using electroplating technology to form a straight electrode wire surface coating and a semi-cylindrical electrode shell surface coating, respectively. The straight electrode wire surface coating and the semi-cylindrical electrode shell surface coating cover the entire probe and will not fall off, and no deformation occurs during the coating process.

[0014] Furthermore, the two ends of the semi-cylindrical electrode shell are not cut to install the bottom support frame and the top support frame.

[0015] Furthermore, the semi-cylindrical electrode shell and the straight electrode wire remain in a straight state during the installation and measurement process and do not bend.

[0016] Furthermore, the bottom support frame, the inner tube support frame and the top support frame are made of high-temperature resistant insulating materials, and the central hole of the inner tube support frame is larger than the diameter of the straight electrode wire.

[0017] Furthermore, the bottom support frame and the semi-cylindrical electrode shell, the short cylinder and the inner support frame, and the top support frame and the semi-cylindrical electrode shell are connected and fixed in sequence by high-temperature resistant glue to achieve structural stability.

[0018] The present invention further discloses a device for real-time measurement of collapse liquid level in a high-temperature and high-pressure environment in a reactor core, comprising the above-mentioned probe for real-time measurement of collapse liquid level in a high-temperature and high-pressure environment in a reactor core.

[0019] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0020] 1. The real-time liquid level measurement probe provided by the present invention is suitable for the harsh conditions of high temperature and high pressure inside a nuclear reactor core. It can realize real-time and accurate measurement of the collapsed liquid level in a narrow space without complicated operations. Only circuit connection is required to realize signal acquisition of the collapsed liquid level.

[0021] 2. The liquid level real-time measurement probe provided by the present invention has a simple structure and can simultaneously meet the real-time measurement requirements of harsh measurement conditions and collapsed liquid levels. It is easy to operate and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a liquid level measurement probe provided by an exemplary embodiment of the present invention;

[0024] Figure 2 1 is a schematic diagram of a calibration curve of a measurement signal of a liquid level measurement probe provided by an exemplary embodiment of the present invention;

[0025] Figure 3 1 is a comparison error curve between the test result and the actual result of the liquid level measurement probe provided by an exemplary embodiment of the present invention.

[0026]

Explanation of main symbols

[0027] 1- bottom support frame;

[0028] 2-semi-cylindrical electrode housing;

[0029] 3- short cylinder;

[0030] 4-straight electrode wire;

[0031] 5-straight electrode wire surface coating;

[0032] 6-support frame inside the cylinder;

[0033] 7- Surface coating of semi-cylindrical electrode shell;

[0034] 8-Top support frame. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1-3 As shown, this embodiment discloses a real-time measurement probe for collapse liquid level in a core high temperature and high pressure environment. A single liquid level measurement probe is assembled and arranged inside a channel to be measured and does not contact the inner wall of the channel. The liquid level measurement probe includes a bottom support frame 1, a semi-cylindrical electrode shell 2, a short cylinder 3, a straight electrode wire 4, an inner support frame 6, and a top support frame 8, wherein:

[0038] The bottom support frame 1, the semi-cylindrical electrode shell 2, the short cylinder 3, the straight electrode wire 4, the inner support frame 6 and the top support frame 8 are coaxially connected in sequence from bottom to top;

[0039] The straight electrode wire 4 is located inside the semi-cylindrical electrode shell 2 and is kept parallel and non-contacting by the bottom support frame 1, the inner support frame 6 and the top support frame 8. The semi-cylindrical electrode shell 2 and the straight electrode wire 4 are spaced equidistantly to form the probe body.

[0040] The straight electrode wire 4 serves as one pole, and the semi-cylindrical electrode shell 2 serves as the other pole, which are led out by wires and connected to the circuit respectively, to form the two poles of the probe signal transmission to achieve signal transmission and reception.

[0041] Furthermore, the semi-cylindrical electrode housing 2 comprises N complete short cylinders 3, where N is an integer not less than 2;

[0042] The spacing between the several complete short cylinders 3 on the semi-cylindrical electrode shell 2 is equal. During the cutting process, the short cylinders 3 do not deform, the cutting line does not deflect, and the length of the short cylinders 3 should not be too long.

[0043] Preferably, the semi-cylindrical electrode shell 2 and the straight electrode wire 4 are both made of the same stainless steel 304. The semi-cylindrical electrode shell 2 is made by cutting a complete metal tube from the middle, and the straight electrode wire 4 is a straight rod-shaped metal wire.

[0044] Furthermore, the surface of the semi-cylindrical electrode shell 2 and the straight electrode wire is plated with a layer of high-temperature resistant hydrophobic conductive metal film of uniform thickness using electroplating technology to form a straight electrode wire surface coating 5 and a semi-cylindrical electrode shell surface coating 7, respectively. The straight electrode wire surface coating 5 and the semi-cylindrical electrode shell surface coating 7 cover the entire probe and will not fall off, and no deformation occurs during the plating process.

[0045] Furthermore, the two ends of the semi-cylindrical electrode shell 2 are not cut so as to mount the bottom support frame 1 and the top support frame 8 .

[0046] Furthermore, the semi-cylindrical electrode housing 2 and the straight electrode wire 4 remain in a straight state during the installation and measurement process and do not bend.

[0047] Furthermore, the bottom support frame 1 , the inner tube support frame 6 and the top support frame 8 are made of high-temperature resistant insulating materials, and the central hole of the inner tube support frame 6 is slightly larger than the diameter of the straight electrode wire 4 .

[0048] Furthermore, the bottom support frame 1 and the semi-cylindrical electrode shell 2, the short cylinder 3 and the inner support frame 6, and the top support frame 8 and the semi-cylindrical electrode shell 2 are connected and fixed in sequence by high-temperature resistant glue to achieve structural stability.

[0049] Preferably, in order to obtain the best measurement data, the diameter of the straight electrode wire 4 is 0.5 mm. The spacing between the short cylinders 3 is 200 mm, and the height is 15 mm. The outer diameter of the semi-cylindrical electrode shell 2 is 4 mm and the length is 1 m.

[0050] Example 2

[0051] The present invention further discloses a device for real-time measurement of collapse liquid level in a high-temperature and high-pressure environment in a reactor core, comprising the above-mentioned probe for real-time measurement of collapse liquid level in a high-temperature and high-pressure environment in a reactor core.

[0052] The present application is further elaborated below in conjunction with the operating principle of the real-time liquid level measurement probe.

[0053] (1) Working principle of the circuit: The semi-cylindrical electrode shell 2 and the straight electrode wire 4 serve as the two poles of the circuit, and together with the liquid in the channel, they form a passage to keep the circuit connected. The semi-cylindrical electrode shell 2, the semi-cylindrical electrode shell surface coating 7, the liquid to be measured, the straight electrode wire surface coating 5, the straight electrode wire 4 and the power supply together form a loop. The coating used is a hydrophobic coating, which is used to keep the wall smooth, reduce the phenomenon of droplets hanging on the wall, and avoid the two electrodes being connected in series by droplets. The liquid level of the liquid to be measured is different, and the corresponding connection length between the electrodes increases, and the resistance value of the liquid part to be measured in the loop changes. Since the change in the output current signal value is linearly related to the change in the resistance value, a linear correlation between the output current signal value and the liquid level height is achieved. In this example, the corresponding linear relationship is fitted through the calibration experiment. Therefore, the working process of the probe measurement is that the power supply outputs an electrical signal, passes through the liquid to be measured, and the output current signal value is stored in the computer, and is substituted into the fitted relationship to obtain the actual liquid level height. According to the specific example, the number of frames of collected data can be specified.

[0054] (2) Calibration of the base value: Before measuring the liquid level in the channel, place the liquid level measurement probe on a calibration model with a known liquid level, and then maintain the acquisition process for a specified number of frames. The average value of the acquired signal is calculated as follows:

[0055]

[0056] Where: I is the initial signal current collected, A; I0 is the average value of the initial signal current; k is the number of collection frames, and n is the total number of frames.

[0057] (3) Based on the sensitivity curve between the current signal received by the liquid level measurement probe and the known height of the liquid to be measured in the channel, an empirical relationship is fitted to obtain the calculation relationship:

[0058] h 坍塌 =0.00088×I 沸腾信号 +10.319

[0059] Where: h 坍塌 is the collapse level height value, mm; I 沸腾信号 is the output current value in boiling state.

[0060] (4) In the actual measurement process, the corresponding collapse liquid level height can be calculated by measuring and recording the current signal under the boiling state.

[0061] The present invention can adapt to the harsh conditions of high temperature and high pressure environment in the core of a nuclear reactor; it realizes real-time and accurate measurement of the collapsed liquid level in the narrow space of the core; it does not require cumbersome operations, and only requires connecting circuits to realize signal acquisition of the collapsed liquid level; the present invention has a simple structure, can simultaneously meet the requirements of harsh measurement conditions and real-time measurement of the collapsed liquid level, is simple to operate, and has strong applicability.

[0062] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A probe for real-time measurement of collapse liquid level in a core under high temperature and high pressure environment, wherein a single liquid level measurement probe is installed inside a channel to be measured and does not contact the inner wall of the channel, characterized in that: The liquid level measurement probe includes a bottom support frame, a semi-cylindrical electrode shell, a short cylinder, a straight electrode wire, an inner support frame, and a top support frame, wherein: The bottom support frame, the semi-cylindrical electrode shell, the short cylinder, the straight electrode wire, the inner support frame of the cylinder and the top support frame are coaxially connected in sequence from bottom to top; The straight electrode wire is located inside the semi-cylindrical electrode shell and is maintained in parallel and non-contact by the bottom support frame, the inner support frame and the top support frame. The semi-cylindrical electrode shell and the straight electrode wire are spaced equidistantly to form a probe body. The straight electrode wire serves as one pole, and the semi-cylindrical electrode shell serves as the other pole, which are led out by wires and connected to circuits respectively, to form two poles of probe signal transmission, thereby realizing signal transmission and reception.

2. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The semi-cylindrical electrode shell comprises N complete short cylinders, where N is an integer not less than 2; The spacing between the several complete short cylinders on the semi-cylindrical electrode shell is equal, the short cylinders do not deform during the cutting process, and the cutting line does not deflect.

3. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The semi-cylindrical electrode shell and the straight electrode wire are both made of the same 304 stainless steel. The semi-cylindrical electrode shell is made by cutting a complete metal tube from the middle, and the straight electrode wire is a straight rod-shaped metal wire.

4. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The surface of the semi-cylindrical electrode shell and the straight electrode wire is coated with a layer of high-temperature resistant hydrophobic conductive metal film of uniform thickness using electroplating technology to form a surface coating of the straight electrode wire and a surface coating of the semi-cylindrical electrode shell, respectively. The surface coating of the straight electrode wire and the surface coating of the semi-cylindrical electrode shell cover the entire probe and will not fall off, and no deformation occurs during the coating process.

5. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The two ends of the semi-cylindrical electrode shell are not cut for mounting the bottom support frame and the top support frame.

6. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The semi-cylindrical electrode shell and the straight electrode wire are kept in a straight state during the installation and measurement process and are not bent.

7. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The bottom support frame, the inner tube support frame and the top support frame are made of high-temperature resistant insulating materials, and the central hole of the inner tube support frame is larger than the diameter of the straight electrode wire.

8. The probe for real-time measurement of collapse liquid level in a core high temperature and high pressure environment according to claim 1, characterized in that: The bottom support frame and the semi-cylindrical electrode shell, the short cylinder and the inner support frame, and the top support frame and the semi-cylindrical electrode shell are connected and fixed in sequence by high-temperature resistant glue to achieve structural stability.

9. A device for real-time measurement of collapse liquid level in a high temperature and high pressure environment in a reactor core, characterized in that: The invention comprises the probe for real-time measurement of collapse liquid level in a high temperature and high pressure environment in a reactor core as described in any one of claims 1 to 8.

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