Full-automatic phase separation device

Abstract

The utility model relates to a full-automatic phase separation device which comprises a separation container connected with the output end of a water inlet pipeline and the input end of a water outlet pipeline; the negative pressure container is connected with the separation container through a first pipeline, a first valve is arranged on the first pipeline to control connection and disconnection of the first pipeline, the negative pressure container is connected with the gas chromatograph through a second pipeline, and a second valve is arranged on the second pipeline to control connection or disconnection of the negative pressure container and the gas chromatograph; the negative pressure generating device is connected with the second valve through a third pipeline, and the second valve controls the negative pressure generating device to be connected or disconnected with the negative pressure container; one end of the nitrogen pipeline is connected with the separation container, and a third valve is arranged on the nitrogen pipeline and used for controlling connection and disconnection of the nitrogen pipeline. The dissolved hydrogen concentration measurement process is carried out in a closed pipeline system and a container, the risk that radioactive gas leaks out and makes contact with personnel is eliminated, dissolved hydrogen is fully separated out through negative pressure separation and bubbling separation, and the measurement result is more accurate.

Description

Technical Field

[0001] The utility model relates to the field of reactor primary loop coolant dissolved hydrogen detection technology, in particular to a fully automated phase separation device. Background Art

[0002] The highly oxidizing products produced by the irradiation decomposition of primary coolant are one of the main causes of corrosion in primary coolant structural materials and equipment. To inhibit the radiolysis process and reduce the concentration of strong oxidants produced by radiolysis, hydrogen is commonly added to the primary coolant. However, excessive hydrogen addition can cause hydrogen embrittlement and cracks in the zirconium cladding of nuclear fuel elements. Therefore, in actual operation, the dissolved hydrogen content in the primary coolant of nuclear power plants is generally controlled within a range of 20 to 50 nml H2 / kg H2O.

[0003] To measure the dissolved hydrogen content in the primary coolant, four methods are generally used: online dissolved hydrogen analyzer, phase separator-gas chromatography, thermal conductivity portable hydrogen meter, and empty box theory method. Among them, the key equipment of "phase separation-gas chromatography" is the phase separator, which is generally arranged in the upstream pipeline of the nuclear sampling system.

[0004] Current phase separators typically use a vacuum pump to create negative pressure within a gas sampling bottle. This process releases dissolved hydrogen from the coolant and collects it in the bottle. The bottle is then removed and the collected gas is analyzed using a gas chromatograph to calculate the dissolved hydrogen content in the coolant. This method requires manual installation and removal of the gas sampling bottle, posing the risk of radioactive gas leakage and human exposure. Utility Model Content

[0005] Based on the above description, the present invention provides a fully automated phase separation device to solve the problem in the related art that the phase separator requires manual installation and disassembly of the gas sampling bottle, which poses the risk of radioactive gas leakage and human contact.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] This application provides a fully automated phase separation device, the technical solutions adopted are as follows:

[0008] A fully automated phase separation device comprising:

[0009] A separation container connected to the output end of the primary coolant inlet pipe and to the input end of the primary coolant outlet pipe;

[0010] A negative pressure container connected to the separation container via a first pipeline, the first pipeline being provided with a first valve for controlling the opening and closing of the first pipeline; the negative pressure container being connected to a gas chromatograph via a second pipeline, the second pipeline being provided with a second valve for controlling the connection or disconnection between the negative pressure container and the gas chromatograph;

[0011] a negative pressure generating device connected to the second valve via a third pipeline, the second valve being used to control the connection or disconnection between the negative pressure generating device and the negative pressure container, the negative pressure generating device being used to generate negative pressure in the negative pressure container;

[0012] A nitrogen pipeline, one end of which is used to connect to a nitrogen source, and the other end is connected to the separation container. A third valve is provided on the nitrogen pipeline to control the on-off of the nitrogen pipeline, which is suitable for ventilating the coolant in the separation container through the nitrogen pipeline.

[0013] Preferably, the negative pressure generating device includes a gas injector, a working gas inlet of which is connected to the third valve through a fourth pipeline, and the third valve is used to control the connection or disconnection of the gas injector with the nitrogen pipeline.

[0014] Preferably, a gas sampling bottle is connected to the second pipeline, and the second valve is arranged between the gas sampling bottle and the negative pressure container, and the second valve is used to control the connection or disconnection between the gas sampling bottle and the negative pressure container. A fourth valve is provided on the second pipeline between the gas sampling bottle and the gas chromatograph, and the fourth valve is used to control the connection or disconnection between the gas sampling bottle and the gas chromatograph.

[0015] Preferably, the gas sampling bottle is connected to a pressure gauge for monitoring the gas pressure therein.

[0016] Preferably, the gas sampling bottle, the negative pressure container and the separation container are distributed in sequence from top to bottom.

[0017] Preferably, a bubbler is provided at the bottom of the separation container, and the output end of the nitrogen pipeline is connected to the bubbler.

[0018] Preferably, the first-loop coolant water inlet pipeline includes a one-way section and a two-way section, the one-way section and the two-way section are connected by a fifth valve, the two-way section is connected to a sampling pipeline through the fifth valve, and the fifth valve is used to control the connection or disconnection between the two-way section and the one-way section, as well as the connection or disconnection between the two-way section and the sampling pipeline.

[0019] Preferably, the working gas outlet of the gas injector is connected to the ventilation system through an outlet pipeline, and the outlet pipeline is provided with a sixth valve for controlling the on-off of the outlet pipeline.

[0020] Preferably, the first valve, the second valve and the third valve are all electrically controlled valves.

[0021] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0022] 1. The present application sets a separation container for temporarily storing coolant, the volume of the separation container is determined, a negative pressure container is connected to the separation container through a first pipeline, the negative pressure container is connected to the gas chromatograph through a second pipeline, and the negative pressure generating device is used to form a negative pressure in the negative pressure container. When performing dissolved hydrogen measurement, the first pipeline is disconnected by the first valve, the coolant water inlet pipeline inputs coolant into the separation container, and outputs it through the water outlet pipeline. After the separation container is filled, the water inlet and outlet pipelines are closed, and at the same time, the second valve disconnects the negative pressure container from the gas chromatograph, and connects the negative pressure container to the negative pressure generating device. Negative pressure is generated in the negative pressure container through the negative pressure generating device, and then the negative pressure container, the gas chromatograph and the negative pressure generating device are all disconnected, and the negative pressure container and the separation container are connected through the first valve. The negative pressure container The internal negative pressure generates a negative pressure in the separation container, which is used to precipitate dissolved hydrogen in the coolant. After a period of negative pressure precipitation, the nitrogen pipeline is connected through a third valve, and air is ventilated into the coolant in the separation container through the nitrogen pipeline, so that the coolant is bubbled to further precipitate the dissolved hydrogen. The precipitated dissolved hydrogen enters the negative pressure container. The negative pressure container and the separation container are then disconnected, and the negative pressure container is connected to a gas chromatograph. The precipitated hydrogen is directly transported to the gas chromatograph for analysis, and the dissolved hydrogen concentration in the coolant is calculated to achieve measurement of the dissolved hydrogen concentration of the coolant. The entire process is carried out in a closed piping system and container, without the need for manual operation, eliminating the risk of radioactive gas leakage and human contact. In addition, the negative pressure precipitation and bubbling precipitation methods can fully precipitate the dissolved hydrogen, and the measurement results are more accurate.

[0023] 2. This application uses a gas ejector as a negative pressure generating device to generate negative pressure in the separation container, and uses nitrogen as the working fluid. A fourth pipeline is provided on the nitrogen pipeline to supply gas to the gas ejector, which can reduce manual operations and unnecessary pipeline layout. The entire device has a simple structure and low cost.

[0024] 3. In this application, a gas sampling bottle is set up, and the precipitated gas first enters the gas sampling bottle after passing through the negative pressure container, and then is input into the gas chromatograph by the gas sampling bottle, so that the precipitated hydrogen can completely enter the gas sampling bottle and be transported to the gas chromatograph. The volume of the gas sampling bottle is determined, and the internal air pressure is monitored by a pressure gauge, so that the system can calculate the concentration of dissolved hydrogen in the coolant and ensure the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1This is a schematic structural diagram of a fully automated phase separation device provided in an embodiment of the present utility model.

[0026] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0027] 1. Primary coolant inlet pipe; 2. Primary coolant outlet pipe; 3. Sampling pipe; 4. Separation container; 5. Negative pressure container; 6. Gas ejector; 7. First pipe; 8. First valve; 9. Gas chromatograph; 10. Second pipe; 11. Second valve; 12. Third pipe; 13. Gas sampling bottle; 14. Fourth valve; 15. Pressure gauge; 16. Nitrogen pipe; 17. Third valve; 18. Bubble generator; 19. Fourth pipe; 20. Fifth valve; 21. Gas outlet pipe; 22. Sixth valve. DETAILED DESCRIPTION

[0028] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0030] It will be understood that spatial relational terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be understood that in addition to the orientations shown in the figures, spatial relational terms also include different orientations of the device in use and operation. For example, if the device in the drawings is turned over, the element or feature described as "under" or "beneath" or "beneath" the other elements will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include alternative orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0031] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection" should be understood as "electrical connection", "communication connection", etc., if the connected circuits, modules, units, etc. can transmit electrical signals or data to each other.

[0032] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

[0033] Reference Figure 1 As shown, an embodiment of the present application provides a fully automated phase separation device, which includes a separation container 4, a negative pressure container 5 and a negative pressure generating device. The separation container 4 is connected to the output end of the primary coolant inlet pipeline 1 and to the input end of the primary coolant outlet pipeline 2; the negative pressure container 5 is connected to the separation container 4 through a first pipeline 7, and the first pipeline 7 is provided with a first valve 8 for controlling the on and off of the first pipeline 7, the negative pressure container 5 is connected to the gas chromatograph 9 through a second pipeline 10, and the second pipeline 10 is provided with a second valve 11 for controlling the connection or disconnection of the negative pressure container 5 and the gas chromatograph 9; the negative pressure generating device is connected to the second valve 11 through a third pipeline 12, and the second valve 11 is used to control the connection or disconnection of the negative pressure generating device and the negative pressure container 5, and the negative pressure generating device is used to generate negative pressure in the negative pressure container 5.

[0034] Reference Figure 1 As shown, specifically, the first valve 8 is connected to the primary coolant outlet pipe 2. In addition to controlling the on-off of the first pipe 7, the first valve 8 also controls the connection or disconnection of the primary coolant outlet pipe 2 and the separation container 4. When the separation container 4 is filled with coolant, the first valve 8 disconnects the first pipe 7 and connects the primary coolant outlet pipe 2 and the separation container 4.

[0035] Reference Figure 1As shown, the negative pressure generating device further uses a gas ejector 6, whose negative pressure generating interface is connected to the second valve 11 via a third pipeline 12. The second valve 11 is used to control whether the negative pressure generating device is connected or disconnected from the negative pressure container 5. Specifically, the working gas inlet of the negative pressure generating device is connected to the high-pressure gas source, and the working gas outlet is connected to the ventilation system via an outlet pipeline 21. A sixth valve 22 is provided on the outlet pipeline 21 to control its on / off function, so as to transport the gas extracted from the negative pressure container 5 to the ventilation system for processing. The gas ejector 6 is used to generate negative pressure in the negative pressure container 5. The gas ejector 6 has no moving parts, is less prone to failure than a vacuum pump, and has a long lifespan, eliminating the cost of maintenance and replacement.

[0036] The second valve 11 can control the connection or disconnection of the negative pressure container 5 with the gas injector 6 and the gas chromatograph 9, thereby realizing the function of generating negative pressure in the negative pressure container 5 through the gas injector 6 and connecting the negative pressure container 5 and the gas chromatograph 9 to input gas into the gas chromatograph 9.

[0037] Reference Figure 1 As shown, further, a gas sampling bottle 13 is connected to the second pipeline 10, and a second valve 11 is provided between the gas sampling bottle 13 and the negative pressure container 5. The second valve 11 is used to control the connection or disconnection of the gas sampling bottle 13 and the negative pressure container 5. A fourth valve 14 is provided on the second pipeline 10 between the gas sampling bottle 13 and the gas chromatograph 9. The fourth valve 14 is used to control the connection or disconnection of the gas sampling bottle 13 and the gas chromatograph 9.

[0038] Reference Figure 1As shown, specifically, the second pipeline 10 is divided into two sections, one section connecting the negative pressure container 5 and the gas sampling bottle 13, and the other section connecting the gas sampling bottle 13 and the gas chromatograph 9. The second valve 11 is provided on the second pipeline 10 between the negative pressure container 5 and the gas sampling bottle 13, and the fourth valve 14 is provided on the second pipeline 10 between the gas sampling bottle 13 and the gas chromatograph 9. At the same time, the gas sampling bottle 13, the negative pressure container 5 and the separation container 4 are arranged to be distributed in sequence from top to bottom. After the negative pressure is generated in the negative pressure container 5 by the gas injector 6, the negative pressure container 5 and the gas sampling bottle 13 are connected, and the gas sampling bottle 13 also generates a negative pressure. During negative pressure separation, the negative pressure container 5 and the separation container 4 are connected, and the negative pressure is used to precipitate the dissolved hydrogen in the coolant. Due to the low density of hydrogen, the precipitated dissolved hydrogen enters the gas sampling bottle 13 after passing through the negative pressure container 5. The arrangement of the gas sampling bottle 13 can ensure that the hydrogen completely enters the gas sampling bottle 13. The volume of the gas sampling bottle 13 is determined during the design, and a pressure gauge 15 for detecting the internal air pressure is connected to the gas sampling bottle 13. When analyzing the gas, the gas sampling bottle 13 and the negative pressure container 5 are disconnected, and the mixed gas containing hydrogen in the gas sampling bottle 13 is input into the gas chromatograph 9 for analysis. The computer calculates the dissolved hydrogen concentration in the coolant based on data such as the volume and air pressure of the gas sampling bottle 13 and the volume of the separation container 4, thereby ensuring the accuracy of the measurement data.

[0039] Reference Figure 1 As shown, further, in order to allow the dissolved hydrogen in the coolant in the separation container 4 to be charged and separated, a nitrogen pipeline 16 is also provided. One end of the nitrogen pipeline 16 is used to connect to the nitrogen gas source, and the other end is connected to the separation container 4. A third valve 17 is provided on the nitrogen pipeline 16 for controlling the on-off of the nitrogen pipeline 16, which is suitable for ventilating the coolant in the separation container 4 through the nitrogen pipeline 16.

[0040] Reference Figure 1 As shown, specifically, a bubbler 18 is provided at the bottom of the separation container 4, and the output end of the nitrogen pipeline 16 is connected to the bubbler 18. After the negative pressure container 5 and the separation container 4 are connected to each other for a period of negative pressure separation, the nitrogen pipeline 16 is connected through the third valve 17, and the nitrogen gas source is opened. The coolant in the separation container 4 is ventilated through the nitrogen pipeline 16, and the nitrogen is output through the bubbler 18 to bubble the coolant so that the dissolved hydrogen is fully separated, thereby improving the accuracy of the measured dissolved hydrogen concentration data.

[0041] Reference Figure 1 As shown, further, the nitrogen gas source also serves as the working gas source of the gas injector 6. The working gas inlet of the gas injector 6 is connected to the third valve 17 through the fourth pipeline 19. The third valve 17 also controls the connection or disconnection between the gas injector 6 and the nitrogen pipeline 16, which can reduce unnecessary pipeline settings.

[0042] Furthermore, the primary coolant inlet pipe 1 includes a one-way section and a two-way section, which are connected by a fifth valve 20. The two-way section is connected to the sampling pipe 3 via the fifth valve 20. The fifth valve 20 is used to control the connection or disconnection between the two-way section and the one-way section, as well as the connection or disconnection between the two-way section and the sampling pipe 3. Valves for controlling on / off are installed at the inlet end of the primary coolant inlet pipe 1, the outlet end of the primary coolant outlet pipe 2, and the sampling pipe 3. When the two-way section and the one-way section are connected, coolant can be injected into the separation container 4 through the one-way coolant inlet pipe 1. When the coolant in the separation container 4 needs to be discharged after the negative pressure separation is completed, the sixth valve 22 on the outlet pipe is closed, the third valve 17 controls the nitrogen pipe 16 to be connected to the gas injector 6, and gas is supplied to the gas injector 6 through the nitrogen gas source. The second valve 11 controls the negative pressure container 5 to be connected to the gas injector 6. At the same time, the first valve 8 controls the negative pressure container 5 to be connected to the separation container 4. Since the outlet pipe 21 is open, nitrogen is input into the negative pressure container 5 through the negative pressure interface of the gas injector 6, and further input into the separation container 4. The nitrogen discharges the coolant in the separation container 4 into the two-way section of the one-way coolant inlet pipe 1. The fifth valve 20 controls the two-way section to be connected to the sampling pipe 3. The coolant passes through the two-way section and through the fifth valve 20 and is input into the sampling pipe 3 and is discharged from the sampling pipe 3, thereby discharging the coolant in the separation container 4.

[0043] Specifically, the first valve 8, the second valve 11, the third valve 17, the fourth valve 14, the fifth valve 20 and the sixth valve 22 are all electrically controlled valves, and the first valve 8, the second valve 11 and the third valve 17 are all three-way valves. The on and off of each valve is controlled by a circuit, and no manual operation is required. The entire measurement work is carried out in a closed pipeline and container, eliminating the risk of radioactive gas leakage and human contact.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully automated phase separation device, characterized in that: include: A separation container (4) is connected to the output end of the primary coolant water inlet pipe (1) and to the input end of the primary coolant water outlet pipe (2); A negative pressure container (5) is connected to the separation container (4) via a first pipeline (7), wherein the first pipeline (7) is provided with a first valve (8) for controlling the opening and closing of the first pipeline (7); the negative pressure container (5) is connected to a gas chromatograph (9) via a second pipeline (10), wherein the second pipeline (10) is provided with a second valve (11) for controlling the connection or disconnection between the negative pressure container (5) and the gas chromatograph (9); a negative pressure generating device connected to the second valve (11) via a third pipeline (12); the second valve (11) is used to control the connection or disconnection between the negative pressure generating device and the negative pressure container (5); the negative pressure generating device is used to generate negative pressure in the negative pressure container (5); A nitrogen pipeline (16) is provided at one end for connecting to a nitrogen gas source and at the other end for connecting to the separation container (4). A third valve (17) is provided on the nitrogen pipeline (16) for controlling the on-off of the nitrogen pipeline (16) and is suitable for ventilating the coolant in the separation container (4) through the nitrogen pipeline (16).

2. The fully automated phase separation device according to claim 1, characterized in that: The negative pressure generating device comprises a gas injector (6), a working gas inlet of which is connected to the third valve (17) via a fourth pipeline (19), and the third valve (17) is used to control the connection or disconnection between the gas injector (6) and the nitrogen pipeline (16).

3. The fully automated phase separation device according to claim 1, characterized in that: A gas sampling bottle (13) is connected to the second pipeline (10), and the second valve (11) is provided between the gas sampling bottle (13) and the negative pressure container (5). The second valve (11) is used to control the connection or disconnection between the gas sampling bottle (13) and the negative pressure container (5). A fourth valve (14) is provided on the second pipeline (10) between the gas sampling bottle (13) and the gas chromatograph (9). The fourth valve (14) is used to control the connection or disconnection between the gas sampling bottle (13) and the gas chromatograph (9).

4. The fully automated phase separation device according to claim 3, characterized in that: The gas sampling bottle (13) is connected to a pressure gauge (15) for monitoring the gas pressure therein.

5. The fully automated phase separation device according to claim 3, characterized in that: The gas sampling bottle (13), the negative pressure container (5) and the separation container (4) are distributed in sequence from top to bottom.

6. The fully automated phase separation device according to claim 1, characterized in that: A bubbler (18) is provided at the bottom of the separation container (4), and the output end of the nitrogen pipeline (16) is connected to the bubbler (18).

7. The fully automated phase separation device according to claim 2, characterized in that: The primary coolant water inlet pipeline (1) comprises a one-way section and a two-way section, the one-way section and the two-way section are connected via a fifth valve (20), the two-way section is connected to a sampling pipeline (3) via the fifth valve (20), and the fifth valve (20) is used to control the connection or disconnection between the two-way section and the one-way section, and to control the connection or disconnection between the two-way section and the sampling pipeline (3).

8. The fully automated phase separation device according to claim 7, characterized in that: The working gas outlet of the gas injector (6) is connected to the ventilation system via an outlet pipeline (21), and a sixth valve (22) for controlling the on-off of the outlet pipeline (21) is provided on the outlet pipeline (21).

9. The fully automated phase separation device according to claim 1, characterized in that: The first valve (8), the second valve (11) and the third valve (17) are all electrically controlled valves.

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