In-pile control oxygen ultra-pure water preparation device

Abstract

This invention discloses an in-reactor oxygen-controlled ultrapure water preparation device, relating to the field of nuclear science and engineering technology. It includes a gas supply assembly, an oxygen-controlled ultrapure water preparation assembly, and a deoxygenated water storage assembly. The gas inlet is equipped with a gas flow control solenoid valve; the liquid inlet employs a high-flow peristaltic pump with a solenoid valve controller, connected in conjunction with a level gauge in the heating vessel to control the inlet volume of ultrapure water; a drive pump is located at the steam outlet of the heating vessel; the stainless steel tubular heat exchanger is lined with polytetrafluoroethylene; the outlet water detection end is equipped with an oxygen probe and a conductivity sensor; and the deoxygenated water storage tank is equipped with a level gauge connected to the solenoid valve controller at the inlet end. The advantage of this in-reactor oxygen-controlled ultrapure water preparation device, employing the above structure, is that it achieves automated preparation of oxygen-controlled ultrapure water through the control of solenoid valves at the gas inlet, liquid inlet, and storage tank.

Description

Technical Field

[0001] This invention relates to the field of nuclear science and engineering technology, and in particular to an apparatus and method for preparing oxygen-controlled ultrapure water in a reactor. Background Technology

[0002] During reactor operation, the reactor interior is a high-temperature, high-pressure environment. Pressurized water reactors and similar types require large quantities of water as coolant and for use in sealed water tanks. This water not only has very high requirements for water quality indicators but also requires strict control of its oxygen content. Excessive oxygen content accelerates the corrosion of internal metal components, affecting the lifespan of the equipment. Therefore, reactor operation requires ultrapure water with stable effluent quality indicators and controllable oxygen content. Currently used deoxygenated ultrapure water preparation devices suffer from insufficient oxygen control precision, lack of automation, and high water production costs for high-throughput water production needs. By selecting different gases, the oxygen content in ultrapure water can be controlled, offering advantages such as precise oxygen concentration adjustment and efficient oxygen-controlled ultrapure water preparation rates, providing higher accuracy compared to oxygen control using reducing agents. Summary of the Invention

[0003] The purpose of this invention is to provide an in-reactor oxygen-controlled ultrapure water preparation device to solve the problems of incomplete oxygen content reduction and slow oxygen-controlled ultrapure water preparation rate when using high-flux deoxygenated water in existing reactors.

[0004] To achieve the above objectives, the present invention provides an in-pile oxygen-controlled ultrapure water preparation device, comprising a gas supply component, an oxygen-controlled ultrapure water preparation component, and a deoxygenated water storage component, wherein the gas supply component and the oxygen-controlled ultrapure water preparation component are connected, and the ultrapure water component and the deoxygenated water storage component are connected.

[0005] Preferably, the gas supply assembly includes two gas cylinders, each with a pressure-dividing valve at its top. The pressure-dividing valve is connected to one end of a gas delivery pipeline, and the gas delivery pipeline is equipped with a gas flow control valve.

[0006] Preferably, the gas cylinder is a nitrogen cylinder, an argon cylinder, or an argon-hydrogen mixed gas cylinder.

[0007] Preferably, the oxygen-controlled ultrapure water preparation assembly includes an ultrapure water heating vessel connected to the other end of the gas delivery pipeline. A first level gauge is provided on one side of the ultrapure water heating vessel, and the bottom of the other side of the ultrapure water heating vessel is connected to one end of a PTFE-lined stainless steel tube. The other end of the PTFE-lined stainless steel tube is connected to a peristaltic pump, which is controlled by a solenoid valve controller.

[0008] The peristaltic pump is equipped with an ultrapure water inlet.

[0009] Preferably, a steam electromagnetic drive pump is provided above the steam outlet of the ultrapure water heating vessel. The steam electromagnetic drive pump is connected to the tubular heat exchanger through a PTFE-lined stainless steel tube 2. A pressure relief valve is provided on the PTFE-lined stainless steel tube 2.

[0010] The ultrapure water heating vessel, the steam electromagnetic drive pump, the pressure relief valve, and the tubular heat exchanger are all housed within the enclosure.

[0011] Preferably, one end of the gas delivery pipe extending into the ultrapure water heating vessel is provided with an air inlet, and the air inlet is lower than the liquid level in the ultrapure water heating vessel; one end of the PTFE-lined stainless steel tube extending into the ultrapure water heating vessel is provided with a water inlet.

[0012] Preferably, the deoxygenated water storage assembly includes an outlet water detection end and a deoxygenated water storage tank. The deoxygenated water storage tank and the outlet water detection end are respectively connected to one end of the PTFE-lined stainless steel tube three through a first water inlet valve and a second water inlet valve. The other end of the PTFE-lined stainless steel tube three is connected to the outlet water end of the tubular heat exchanger.

[0013] A second level gauge is provided on one side of the deoxygenated water storage tank, and a deoxygenated water outlet is provided on the other side of the deoxygenated water storage tank. A water outlet valve is provided on the deoxygenated water outlet.

[0014] Preferably, the water outlet detection end includes a detachable water tank, on which an oxygen probe and a conductivity sensor are installed. Both the conductivity sensor and the oxygen probe are connected to a monitoring display, which is installed on the detachable water tank.

[0015] The detachable water tank is equipped with a normal operation light and an alarm light.

[0016] Therefore, the present invention provides an in-reactor oxygen-controlled ultrapure water preparation device with the above-described structure, which has a high deoxygenated water preparation throughput, is easy to automate, reduces the inaccuracy of oxygen content control, and provides a method for preparing high-throughput oxygen-controlled ultrapure water for reactors.

[0017] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an embodiment of an in-pile oxygen-controlled ultrapure water preparation device according to the present invention;

[0019] Figure 2 This is a diagram showing the dissolved oxygen concentration in deoxygenated water in an embodiment of an in-pile oxygen-controlled ultrapure water preparation device of the present invention;

[0020] Reference numerals: 1. Gas cylinder; 2. Pressure divider valve; 3. Gas delivery pipeline; 4. Gas flow control valve; 5. Ultrapure water heating vessel; 6. First level gauge; 7. PTFE-lined stainless steel tube one; 8. Peristaltic pump; 9. Solenoid valve controller; 10. Ultrapure water inlet; 11. Steam electromagnetic drive pump; 12. PTFE-lined stainless steel tube two; 13. Tubular heat exchanger; 14. Pressure relief valve; 15. Box body; 16. Air inlet; 17. Water inlet; 18. Deoxygenated water storage tank; 19. First water inlet valve; 20. PTFE-lined stainless steel tube three; 21. Second level gauge; 22. Deoxygenated water outlet; 23. Water outlet valve; 24. Removable water tank; 25. Oxygen probe; 26. Conductivity sensor; 27. Monitoring indicator; 28. Normal operation light; 29. ​​Alarm light; 30. Second water inlet valve. Detailed Implementation

[0021] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Example

[0024] Please see Figure 1-2 The present invention provides an in-pile oxygen-controlled ultrapure water preparation device, including a gas supply component, an oxygen-controlled ultrapure water preparation component, and a deoxygenated water storage component. The gas supply component and the oxygen-controlled ultrapure water preparation component are connected, and the ultrapure water component and the deoxygenated water storage component are connected.

[0025] The gas supply assembly includes two gas cylinders 1, which are either nitrogen cylinders, argon cylinders, or argon-hydrogen mixture cylinders. The function of gas cylinders 1 is to introduce inert gas into the device to remove oxygen and provide an inert (or inert and reducing) gas atmosphere. Each gas cylinder 1 is equipped with a pressure-dividing valve 2 at its top, which is connected to one end of a gas delivery pipeline 3. A gas flow control valve 4 is installed on the gas delivery pipeline 3. The pressure-dividing valve 2 regulates the gas flow rate and monitors the gas content in gas cylinder 1. The gas flow control valve 4 directs the gas from gas cylinder 1 into the device according to a set ratio and flow rate.

[0026] The oxygen-controlled ultrapure water preparation assembly includes an ultrapure water heating vessel 5 connected to the other end of the gas delivery pipeline 3. The function of the ultrapure water heating vessel 5 is to heat the ultrapure water injected by the peristaltic pump 8 to generate water vapor. A first level gauge 6 is installed on one side of the ultrapure water heating vessel 5. Figure 1 As shown, the upper part is the max scale of the first liquid level gauge 6, and the lower part is the min scale of the first liquid level gauge 6. When the liquid level is lower than min, the solenoid valve controller 9 controls the peristaltic pump 8 to work and introduce water into the ultrapure water heating vessel 5. When the liquid level is higher than max, the solenoid valve controller 9 controls the peristaltic pump 8 to stop working. The liquid level is always higher than the air inlet 16.

[0027] Whether the ultrapure water heating vessel 5 works depends on the second level gauge 21 of the deoxygenated water storage tank 18. When the liquid level is higher than max, the ultrapure water heating vessel 5 stops working. When the liquid level is lower than min, the ultrapure water heating vessel 5 works.

[0028] The bottom of the other side of the ultrapure water heating vessel 5 is connected to one end of the PTFE-lined stainless steel tube 7, and the other end of the PTFE-lined stainless steel tube 7 is connected to the peristaltic pump 8, which is controlled by a solenoid valve controller 9. The peristaltic pump 8 is equipped with an ultrapure water inlet 10.

[0029] A steam electromagnetic drive pump 11 is installed above the steam outlet of the ultrapure water heating vessel 5. The function of the steam electromagnetic drive pump 11 is to drive the water vapor generated by the operation of the ultrapure water heating vessel 5 into the tubular heat exchanger 13. The steam electromagnetic drive pump 11 is connected to the tubular heat exchanger 13 through a PTFE-lined stainless steel tube 2 12. A pressure relief valve 14 is installed on the PTFE-lined stainless steel tube 2 12. The PTFE-lined stainless steel tube 2 12 has an insulation layer on the outside. The function of the pressure relief valve 14 is to release pressure when the pressure inside the device is higher than the set value.

[0030] The ultrapure water heating vessel 5, the steam electromagnetic drive pump 11, the pressure relief valve 14, and the tubular heat exchanger 13 are all housed inside the enclosure 15. The enclosure 15 is made of stainless steel and is located between the gas cylinder 1 and the deoxygenated water storage tank 18. The enclosure 15 serves to integrate the ultrapure water heating vessel 5 and the tubular heat exchanger 13.

[0031] The gas delivery pipeline 3 extends into the ultrapure water heating vessel 5 and is provided with an air inlet 16. When the ultrapure water heating vessel 5 is working, the air inlet 16 is lower than the liquid level inside the ultrapure water heating vessel 5. The PTFE-lined stainless steel tube 7 extends into the ultrapure water heating vessel 5 and is provided with a water inlet 17.

[0032] The deoxygenated water storage assembly includes an outlet water detection end and a deoxygenated water storage tank 18. The deoxygenated water storage tank 18 and the outlet water detection end are respectively connected to one end of the PTFE-lined stainless steel tube 20 through the first inlet valve 19. The other end of the PTFE-lined stainless steel tube 20 is connected to the outlet of the tubular heat exchanger 13.

[0033] A second level gauge 21 is installed on one side of the deoxygenated water storage tank 18, such as... Figure 1 As shown, the upper part is the max scale of the second level gauge 21, and the lower part is the min scale of the second level gauge 21. When the liquid level is below min, the ultrapure water heating vessel 5 starts to operate and begins to generate water vapor; when the liquid level is above max, the ultrapure water heating vessel 5 stops operating. A deoxygenated water outlet 22 is provided on the other side of the deoxygenated water storage tank 18. An outlet valve 23 is provided on the deoxygenated water outlet 22. The outlet valve 23 is a normally closed one-way valve.

[0034] The outlet water detection end includes a removable water tank 24, on which an oxygen probe 25 and a conductivity sensor 26 are installed. The oxygen probe 25 monitors the oxygen content of the outlet water from the tubular heat exchanger 13, and the conductivity sensor 26 monitors the conductivity of the outlet water from the tubular heat exchanger 13. Both the conductivity sensor 26 and the oxygen probe 25 are connected to a monitoring indicator 27, which is located on the removable water tank 24. The removable water tank 24 is equipped with a normal operation light 28 and an alarm light 29. When both the oxygen content and conductivity are below the set values ​​(e.g., 0.01 mg / L and 18.2 MΩ·cm), the normal operation light 28 remains constantly lit. When either the oxygen content or conductivity is above the set value, the alarm light 29 flashes.

[0035] In practical use, open the first inlet valve 19 and the second inlet valve 30. Open the pressure divider valve 2 and the gas flow control valve 4 to introduce inert gas into the device and replace the air inside. Close the first inlet valve 19, open the solenoid valve controller 9, and the peristaltic pump 8 starts working. Ultrapure water enters the ultrapure water heating vessel 5 from the ultrapure water inlet 10 through the inlet 17. The liquid level in the ultrapure water heating vessel 5 is controlled by the first level gauge 6. When the liquid level is below min, the solenoid valve controller 9 controls the peristaltic pump 8 to work and introduce water into the ultrapure water heating vessel 5. When the liquid level is above max, the solenoid valve controller 9 controls the peristaltic pump 8 to stop working, and the liquid level is always higher than the air inlet 16. The water vapor generated by the operation of the ultrapure water heating vessel 5 is quickly drawn into the tubular heat exchanger 13 by the steam electromagnetic drive pump 11. In the tubular heat exchanger 13, it is condensed into liquid deoxygenated water, which enters the detachable water tank 24 at the outlet detection end through the PTFE-lined stainless steel tube 20 and the second inlet valve 30. Oxygen content and conductivity monitoring values ​​are set on the monitoring indicator 27. When both oxygen content and conductivity are lower than or equal to the set monitoring values ​​(e.g., 0.01 mg / L and 18.2 MΩ·cm), the normal operation indicator 28 remains constantly lit, and the first inlet valve 19 is opened, allowing deoxygenated water to enter the deoxygenated water storage tank 18. When either oxygen content or conductivity exceeds the set value, the alarm indicator 29 flashes. After eliminating factors that cause the value to exceed the set value, the normal operation indicator 28 remains constantly lit, and the first inlet valve 19 is opened, allowing deoxygenated water to enter the deoxygenated water storage tank 18. When the liquid level in the deoxygenated water storage tank 18 is higher than the maximum level of the second level gauge 21, the ultrapure water heating vessel 5 stops working; when it is lower than the minimum level of the second level gauge 21, the ultrapure water heating vessel 5 starts producing water vapor.

[0036] Through experiments on dissolved oxygen content and heating time, the following results were obtained. Figure 2 The specific process of dissolved oxygen levels changing over time is as follows:

[0037] Time period A: The device is in the heating state and the air inside is vented by gas. No deoxygenated water is produced in the deoxygenated water storage tank 18. At this time, the dissolved oxygen content is 0.03 mg / L.

[0038] Time period B: Deoxygenated water is produced in deoxygenated water storage tank 18. At this time, the dissolved oxygen level gradually increases and eventually reaches a peak of 0.12 mg / L.

[0039] Time period C: The dissolved oxygen content in the deoxygenated water is at its highest value. Subsequently, the condensate flow rate of tubular heat exchanger 13 is adjusted to 3.42 mL / s, and the pressure of the pressure divider valve 2 is set to 0.05 MPa. At this time, the dissolved oxygen content is maintained at 0.12 mg / L, and after 1 minute, it begins to decrease rapidly.

[0040] Time period D: The dissolved oxygen content of the deoxygenated water gradually decreases to the dissolved oxygen content value during time period A.

[0041] Time period EG: After the dissolved oxygen content of the deoxygenated water is maintained in equilibrium for a period of time, it begins to gradually decrease, eventually dropping to 0 mg / L and remaining stable.

[0042] Therefore, the present invention provides an in-reactor oxygen-controlled ultrapure water preparation device with the above-described structure, which has a high deoxygenated water preparation throughput, is easy to automate, reduces the inaccuracy of oxygen content control, and provides a method for preparing high-throughput oxygen-controlled ultrapure water for reactors.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. An in-pile oxygen-controlled ultrapure water preparation device, characterized in that: It includes a gas supply component, an oxygen-controlled ultrapure water preparation component, and a deoxygenated water storage component. The gas supply component and the oxygen-controlled ultrapure water preparation component are connected, and the oxygen-controlled ultrapure water preparation component and the deoxygenated water storage component are connected. The gas supply assembly includes two gas cylinders, each with a pressure-dividing valve on its top. The pressure-dividing valve is connected to one end of a gas delivery pipeline, and a gas flow control valve is provided on the gas delivery pipeline. The gas cylinder is a nitrogen cylinder, an argon cylinder, or an argon-hydrogen mixed gas cylinder; The oxygen-controlled ultrapure water preparation assembly includes an ultrapure water heating vessel connected to the other end of the gas delivery pipeline. A first level gauge is provided on one side of the ultrapure water heating vessel. The bottom of the other side of the ultrapure water heating vessel is connected to one end of a PTFE-lined stainless steel tube. The other end of the PTFE-lined stainless steel tube is connected to a peristaltic pump, which is controlled by a solenoid valve controller. The peristaltic pump is equipped with an ultrapure water inlet; A steam electromagnetic drive pump is installed above the steam outlet of the ultrapure water heating vessel. The steam electromagnetic drive pump is connected to the tubular heat exchanger through a PTFE-lined stainless steel tube 2. A pressure relief valve is installed on the PTFE-lined stainless steel tube 2. The ultrapure water heating vessel, the steam electromagnetic drive pump, the pressure relief valve, and the tubular heat exchanger are all housed within the enclosure.

2. The in-pile oxygen-controlled ultrapure water preparation device according to claim 1, characterized in that: The gas delivery pipeline has an air inlet at one end that extends into the ultrapure water heating vessel, and the air inlet is lower than the liquid level in the ultrapure water heating vessel; the PTFE-lined stainless steel tube has a water inlet at one end that extends into the ultrapure water heating vessel.

3. The in-pile oxygen-controlled ultrapure water preparation device according to claim 1, characterized in that: The deoxygenated water storage assembly includes an outlet detection end and a deoxygenated water storage tank. The deoxygenated water storage tank and the outlet detection end are respectively connected to one end of the PTFE-lined stainless steel tube 3 through a first inlet valve and a second inlet valve. The other end of the PTFE-lined stainless steel tube 3 is connected to the outlet end of the tubular heat exchanger. A second level gauge is provided on one side of the deoxygenated water storage tank, and a deoxygenated water outlet is provided on the other side of the deoxygenated water storage tank. A water outlet valve is provided on the deoxygenated water outlet.

4. The in-pile oxygen-controlled ultrapure water preparation device according to claim 3, characterized in that: The water outlet detection end includes a detachable water tank, on which an oxygen probe and a conductivity sensor are installed. Both the conductivity sensor and the oxygen probe are connected to a monitoring display, which is installed on the detachable water tank. The detachable water tank is equipped with a normal operation light and an alarm light.

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