Device for removing non-condensable gases and water conduit for nuclear power plants

Abstract

The application provides a device for removing non-condensable gas and a water delivery pipeline of a nuclear power plant. The device comprises an inlet pipe section, a diffusion section and an outlet pipe section connected in sequence, the axial diameter of the diffusion section is smaller than that of the inlet pipe section and the outlet pipe section; at least one air guide pipe, one end of the air guide pipe is communicated with the diffusion section and extends upwards away from the diffusion section; further comprising a separation mechanism, the separation mechanism comprises a separation chamber, the top of the separation chamber is provided with an exhaust pipe, the bottom of the separation chamber is provided with a liquid discharge pipe, the other end of the air guide pipe is communicated with the separation chamber, one end of the liquid discharge pipe is communicated with the outlet pipe section; wherein the separation chamber is in a continuous negative pressure state. The device for removing non-condensable gas reduces the oxygen content in water by using a physical method, and makes the desalted water meet the water chemistry requirements by repeatedly circulating and discharging air, thereby greatly reducing the chemical pollution risk of using chemical agents to remove oxygen, and being beneficial to ensuring the safety of equipment and the health of maintenance personnel.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant water supply technology, specifically to a device for removing non-condensable gases and a nuclear power plant water supply pipeline. Background Technology

[0002] The stable and safe operation of a nuclear power plant requires water chemistry support that meets certain requirements, specifically desalination and deoxygenation water as a supplementary water source for operation.

[0003] Currently, nuclear power plants typically use chemical agents to remove dissolved oxygen and other non-condensable gases, or suppress oxygen content by adding hydrogen or other means.

[0004] Using chemical deoxygenation agents requires specialized, corrosion-resistant dosing devices and interfaces, a dedicated storage area, and management by designated personnel. The chemicals themselves are chemical pollutants and pose a potential hazard to personnel. If non-condensable gases are continuously removed and oxygen content reduced using physical methods during operation, ensuring the demineralized water meets water chemistry requirements, the amount of chemical agents needed will be significantly reduced, minimizing the risk of chemical pollution and protecting personnel health.

[0005] Based on this, the inventors of this application propose a device for removing non-condensable gases and a water supply pipeline for nuclear power plants, in order to solve the above-mentioned technical problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the defects of the existing technology of removing non-condensable gases from water pipelines in nuclear power plants, which are prone to chemical pollution and are troublesome to arrange and manage. The present invention provides a device for removing non-condensable gases and a water pipeline for nuclear power plants.

[0007] The present invention solves the above-mentioned technical problems through the following technical solution:

[0008] The present invention provides an apparatus for removing non-condensable gases, characterized in that it comprises: an inlet pipe section, a diffuser section, and an outlet pipe section connected in sequence, wherein the axial diameter of the diffuser section is smaller than that of the inlet pipe section and the outlet pipe section;

[0009] At least one air intake tube, one end of which is connected to the diffuser section and extends upward away from the diffuser section;

[0010] A separation mechanism includes a separation chamber, an exhaust pipe at the top of the separation chamber, a drain pipe at the bottom of the separation chamber, a vent pipe connected to the separation chamber at one end, and a drain pipe connected to an outlet pipe section at one end.

[0011] The separation chamber is under continuous negative pressure.

[0012] According to one embodiment of the present invention, the axial diameter of the inlet pipe section gradually decreases near the diffuser section;

[0013] The diameter of the outlet pipe section gradually decreases towards the diffuser section.

[0014] According to one embodiment of the present invention, the number of air intake tubes is at least two, and the at least two air intake tubes are arranged at axial intervals along the diffuser section.

[0015] According to one embodiment of the present invention, the axial direction of the air intake tube is set at an angle to the axial direction of the diffuser section.

[0016] According to one embodiment of the present invention, at least two of the air intake tubes converge at one end away from the diffuser section and flow together into the separation chamber.

[0017] According to one embodiment of the present invention, the diameter of each of the air intake tubes is smaller than the diameter of the diffuser section.

[0018] According to one embodiment of the present invention, the top of the separation chamber is provided with a plurality of gas guide vanes, and the plurality of gas guide vanes are arranged spirally upward along the axial direction of the separation chamber;

[0019] The bottom of the separation chamber is provided with multiple liquid guide vanes, which are arranged spirally downward along the axial direction of the separation chamber.

[0020] According to one embodiment of the present invention, a liquid guiding hole is formed between adjacent gas guiding blades.

[0021] According to one embodiment of the present invention, an exhaust pump is provided on the exhaust pipe;

[0022] A drain pump is installed on the drain pipe, which is used to extract the water collected at the bottom of the separation chamber; a drain valve is also installed downstream of the drain pump, which is used to control the connection and disconnection between the separation chamber and the outlet pipe section.

[0023] The present invention also provides a nuclear power plant water transmission pipeline, characterized in that it includes:

[0024] Water pipeline;

[0025] At least two devices for removing non-condensable gases as described above are installed along the water delivery path of the water pipeline, such that water in the water pipeline flows through the devices for removing non-condensable gases.

[0026] The positive and progressive effects of this invention are as follows:

[0027] This invention relates to a device for removing non-condensable gases. Utilizing principles of fluid mechanics and thermodynamics, the device accelerates and depressurizes the fluid through a constriction mechanism. Non-condensable gases in the water continuously precipitate under low pressure. Then, the gas is introduced into the separation chamber through an air inlet pipe. By using physical means to continuously remove non-condensable gases, the oxygen content in the water is reduced. Through repeated circulation and exhaust, the demineralized water meets the water chemistry requirements, greatly reducing the chemical pollution risk associated with using chemical deoxygenation agents. This is beneficial for ensuring equipment safety and the health of maintenance personnel. Attached Figure Description

[0028] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein:

[0029] Figure 1 This is a schematic diagram of the structure of an exemplary device for removing non-condensable gases according to the present invention;

[0030] Figure 2 This is a simplified structural diagram of one embodiment of the nuclear power plant water supply pipeline of the present invention;

[0031] Figure 3 This is a simplified structural diagram of another embodiment of the nuclear power plant water pipeline of the present invention.

[0032] 1. Water supply pipeline;

[0033] 2. Inlet pipe section;

[0034] 3. Diffusion section;

[0035] 4. Outlet pipe section;

[0036] 5. Breathing tube;

[0037] 6. Separation mechanism; 61. Separation chamber; 62. Exhaust pipe; 621. Exhaust pump; 63. Drain pipe; 631. Drain pump; 632. Drain valve; 64. Gas guide vane; 641. Liquid guide hole; 65. Liquid guide vane;

[0038] 7. Apparatus for removing non-condensable gases. Detailed Implementation

[0039] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] Reference Figure 1 The present invention proposes a device 7 for removing non-condensable gases, which is installed on a nuclear power plant water pipeline 1. The device 7 for removing non-condensable gases includes an inlet pipe section 2, a diffusion section 3 and an outlet pipe section 4 connected in sequence. The axial diameter of the diffusion section 3 is smaller than that of the inlet pipe section 2 and the outlet pipe section 4.

[0042] At least one air intake pipe 5 is provided on the diffuser section 3. One end of the air intake pipe 5 is connected to the diffuser section 3 and extends upward away from the diffuser section 3. The other end of the air intake pipe 5 is also provided with a separation mechanism 6. The separation mechanism 6 includes a separation chamber 61. The top of the separation chamber 61 is provided with an exhaust pipe 62, and the bottom of the separation chamber 61 is provided with a drain pipe 63. The other end of the air intake pipe 5 is connected to the separation chamber 61, and one end of the drain pipe 63 is connected to the outlet pipe section 4. The separation chamber 61 is in a continuous negative pressure state.

[0043] Compared to the traditional method of removing dissolved oxygen from water using chemical agents, this application uses the principles of fluid mechanics and thermodynamics to accelerate the depressurization of the fluid through a gradual contraction and expansion method. Non-condensable gases in the water are continuously released under low pressure. By setting an air intake pipe 5 in the low-pressure zone corresponding to the diffusion section 3, the released gas is introduced into the separation chamber 61.

[0044] The separation chamber 61 is divided into an exhaust pipe 62 and a drain pipe 63. The exhaust pipe 62 can continuously discharge the collected gas, and the drain pipe 63 can return the liquid contained in the gas back to the water supply pipe 1 to avoid water waste.

[0045] Moreover, because the separation chamber 61 is under continuous negative pressure due to the exhaust pipe 62, it is beneficial to continuously introduce the non-condensable gas released from the diffusion section 3 into the separation chamber 61 through the air intake pipe 5.

[0046] In one embodiment, the diameter of the inlet pipe section 2 gradually decreases towards the diffuser section 3; the diameter of the outlet pipe section 4 gradually decreases towards the diffuser section 3.

[0047] That is, the ends of the inlet pipe section 2 and the outlet pipe section 4 facing the diffuser section 3 are both arranged in a tapering structure. This is conducive to the gradual increase of flow velocity and decrease of pressure of water in the water conveyance pipeline 1 through the inlet pipe section 2, and the corresponding deceleration and increase of pressure through the diffuser section 3 to the outlet pipe section 4, so as to avoid changes in the flow velocity and pressure of water in the water conveyance pipeline 1.

[0048] Preferably, there are at least two air intake pipes 5, and at least two air intake pipes 5 are arranged at intervals along the axial direction of the diffuser section 3.

[0049] Multiple air intake pipes 5 are arranged at intervals along the axial direction of the diffusion section 3 to improve the absorption efficiency of non-condensable gases. The specific number of air intake pipes 5 is not limited here.

[0050] Specifically, the axial angle between the air intake tube 5 and the diffuser section 3 is set.

[0051] Arranging the gas inlet pipe 5 at an angle relative to the diffuser section 3 allows the gas, which has a lower density, to move upwards, thereby improving the gas delivery efficiency.

[0052] In one embodiment, at least two air intake tubes 5 converge at one end away from the diffuser section 3 and flow together into the separation chamber 61.

[0053] To avoid having multiple openings outside the separation chamber 61, multiple air intake pipes 5 are converged before reaching the separation chamber 61, so that only one pipeline is needed to connect to the separation chamber 61, simplifying the structure of the separation mechanism 6.

[0054] Furthermore, the diameter of each air intake tube 5 is smaller than the diameter of the diffuser section 3.

[0055] The diameter of the air intake pipe 5 is set to be smaller than that of the diffuser section 3 in order to avoid excessive water entering the air intake pipe 5 due to an excessively large diameter, which would affect the degassing efficiency.

[0056] In one embodiment, the top of the separation chamber 61 is provided with a plurality of gas guide vanes 64, which are arranged spirally upward along the axial direction of the separation chamber 61. The bottom of the separation chamber 61 is provided with a plurality of liquid guide vanes 65, which are arranged spirally downward along the axial direction of the separation chamber 61.

[0057] The gas is absorbed by the exhaust pipe 62 and continuously transported upward by the gas guide vane 64. Under the action of centrifugal force, the gas-liquid separation is completed. The separated liquid flows into the drain pipe 63 through the liquid guide vane 65 and then into the water supply pipe 1.

[0058] In one embodiment, a liquid guiding hole 641 is formed between adjacent gas guide vanes 64.

[0059] That is, when the gas is conveyed along the gas guide vane 64 toward the exhaust pipe 62, the liquid contained in the gas will flow through the liquid guide hole 641 to the side of the liquid guide vane 65.

[0060] An exhaust pump 621 is installed on the exhaust pipe 62, and a drain pump 631 is installed on the drain pipe. The drain pump 631 is used to extract the water collected at the bottom of the separation chamber 61. A drain valve 632 is also installed downstream of the drain pump 631. The drain valve 632 is used to control the opening and closing between the separation chamber 61 and the outlet pipe section 4.

[0061] Before removing non-condensable gases, the exhaust pump 621 can be turned on to draw air out of the separation chamber 61 to create a negative pressure environment. This makes it easier for the non-condensable gases precipitated in the diffusion section 3 to be transported to the exhaust pipe 62 for discharge, thus improving the removal efficiency of non-condensable gases.

[0062] This invention utilizes fluid mechanics and thermodynamics principles to accelerate and depressurize the fluid. Non-condensable gases in the water continuously precipitate under low pressure. These precipitated gases are introduced into a separation chamber 61 via a gas inlet pipe 5. The separation chamber 61 further separates the gas and liquid. The gas is extracted by an exhaust pump 621, while the liquid flows back into the water supply pipeline 1 via a drain pump 631. This application continuously removes non-condensable gases through physical means, reducing the oxygen content in the water. Repeated evacuation helps ensure that the demineralized water meets the water chemistry requirements.

[0063] Under normal operating conditions, the fluid enters the diffuser section 3 through the inlet pipe section 2. In the diffuser section 3, the fluid velocity increases while the pressure decreases. As the pressure decreases, non-condensable gases dissolved in the water continuously precipitate out in the diffuser section 3. At least one gas inlet pipe 5 is installed in the diffuser section 3 to transport the precipitated gas upwards, carrying liquid along with it. After reaching the separation chamber 61, the gas in the gas inlet pipe 5 continuously rises and is discharged to the outside of the separation chamber 61 under the drive of the gas guide vanes 64 and the exhaust pump 621. The trace amounts of liquid carried in the gas gradually adhere to the upper inner wall of the separation chamber 61 under the action of centrifugal force during the upward flow, and finally flow into the lower part of the separation chamber 61 from the liquid guide hole 641.

[0064] The drain pipe 63 can discharge the collected liquid to the outside of the separation chamber 61 under the drive of the drain pump 631.

[0065] It should be noted that a level gauge can also be installed in the separation chamber 61. The level gauge is used to monitor the liquid level at the bottom of the separation chamber 61. When the level gauge reaches the high set value, the drain pump 631 is turned on, and the liquid enters the outlet pipe section 4 through the drain pipe 63.

[0066] When the level gauge reaches the low set value, the drain pump 631 and the drain valve 632 are closed.

[0067] The present invention also proposes a nuclear power plant water pipeline, comprising: a water pipeline 1 and at least two devices 7 for removing non-condensable gases as described above, which are arranged along the transport path of the water pipeline 1. The devices 7 for removing non-condensable gases are installed in the water pipeline 1 so that water in the water pipeline 1 flows through the devices 7 for removing non-condensable gases.

[0068] Please refer to Figure 2 and Figure 3 The present invention can install multiple of the above-mentioned devices 7 for removing non-condensable gases at intervals on the water pipeline 1 (see reference). Figure 3 This also allows the water in the water supply pipe 1 to flow multiple times through the device 7 for removing non-condensable gases (see reference). Figure 2 This process removes non-condensable gases from the water, ensuring that the demineralized water meets the water chemistry requirements. This significantly reduces the risk of chemical pollution from using chemical deoxygenation agents, and helps protect equipment safety and the health of maintenance personnel.

[0069] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "joining", and "fixing" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can also refer to mechanical connections. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] This application uses specific terms to describe embodiments of the application. Terms such as "an embodiment," "one embodiment," and / or "some embodiments" refer to a particular feature, structure, or characteristic associated with at least one embodiment of the application. Therefore, it should be emphasized and noted that references to "an embodiment," "one embodiment," or "an alternative embodiment" in different locations throughout this specification do not necessarily refer to the same embodiment. Furthermore, certain features, structures, or characteristics in one or more embodiments of the application can be appropriately combined.

[0072] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for removing non-condensable gases, installed on a water supply pipeline of a nuclear power plant, characterized in that, include: An inlet pipe section, a diffuser section, and an outlet pipe section are connected in sequence, wherein the axial diameter of the diffuser section is smaller than that of the inlet pipe section and the outlet pipe section; At least one air intake tube, one end of which is connected to the diffuser section and extends upward away from the diffuser section; A separation mechanism includes a separation chamber, an exhaust pipe at the top of the separation chamber, a drain pipe at the bottom of the separation chamber, one end of an air intake pipe connected to the separation chamber, and one end of the drain pipe connected to an outlet pipe section; wherein... The separation chamber is under continuous negative pressure. The diameter of the inlet pipe section gradually decreases near the diffuser section. The diameter of the outlet pipe section gradually decreases towards one end of the diffuser section; The axial direction of the air intake pipe is set at an angle to the axial direction of the diffuser section; An exhaust pump is installed on the exhaust pipe; A drainage pump is installed on the drainage pipe, which is used to extract the water collected at the bottom of the separation chamber; a drainage valve is also installed downstream of the drainage pump, which is used to control the connection and disconnection between the separation chamber and the outlet pipe section.

2. The apparatus for removing non-condensable gases according to claim 1, characterized in that, The number of air intake tubes is at least two, and the at least two air intake tubes are arranged at an axial interval along the diffuser section.

3. The apparatus for removing non-condensable gases according to claim 2, characterized in that, At least two of the air intake tubes converge at the end opposite to the diffuser section and flow together into the separation chamber.

4. The apparatus for removing non-condensable gases according to claim 1, characterized in that, The diameter of each of the air intake tubes is smaller than the diameter of the diffuser section.

5. The apparatus for removing non-condensable gases according to claim 1, characterized in that, The top of the separation chamber is provided with multiple gas guide vanes, which are arranged spirally upward along the axial direction of the separation chamber. The bottom of the separation chamber is provided with multiple liquid guide vanes, which are arranged spirally downward along the axial direction of the separation chamber.

6. The apparatus for removing non-condensable gases according to claim 5, characterized in that, Liquid guiding holes are formed between adjacent gas guide vanes.

7. A water transmission pipeline for a nuclear power plant, characterized in that, include: Water pipeline; At least two devices for removing non-condensable gases as described in any one of claims 1-6 are arranged along the water delivery path of the water pipeline, the devices for removing non-condensable gases being installed in the water pipeline such that water in the water pipeline flows through the devices for removing non-condensable gases.

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