A non-powered dosing device

Abstract

This utility model belongs to the field of pipeline commissioning devices, and particularly relates to a non-powered dosing device, including an inlet pipe, a dosing tank, and an outlet pipe. The dosing tank has a first interface, a second interface, and a dosing port. The inlet end of the inlet pipe is adapted to extend into a first position of a secondary loop pipeline, and the outlet end of the inlet pipe is connected to the first interface. The open end face of the inlet end of the inlet pipe intersects with the liquid flow direction of the secondary loop pipeline to guide the liquid of the secondary loop pipeline into the inlet pipe. An inlet valve is provided on the inlet pipe to control the opening and closing of the inlet pipe. The inlet end of the outlet pipe is connected to the second interface, and the outlet end of the outlet pipe is connected to a second position of the secondary loop pipeline. The liquid pressure at the first position is greater than the liquid pressure at the second position. This utility model has the advantage of reducing production costs.

Description

Technical Field

[0001] This utility model belongs to the field of pipeline commissioning devices, and in particular relates to a non-powered chemical dosing device. Background Technology

[0002] During the construction, commissioning, and operation of nuclear power plants, the secondary loop system often employs a high-temperature, high-flow-rate fluid environment, forming a secondary loop circulation. However, secondary loop piping is typically made of carbon steel, which is highly susceptible to corrosion under the influence of high-temperature, high-speed fluids, affecting pipe lifespan and the stable operation of the nuclear power plant. Therefore, it is necessary to add chemicals to the secondary loop piping, such as pH-adjusting liquids, to reduce corrosion and ensure the safe and stable operation of the secondary loop system.

[0003] In nuclear power plants, the saturated steam pressure in the secondary loop is approximately 6-7 MPa. In the secondary loop system, the steam generated by the steam generator typically falls within this pressure range. The steam then enters the turbine to perform work, driving the turbine to rotate and, in turn, powering the generator. The exhaust steam is condensed into water in the condenser and then returned to the steam generator through a series of devices, completing the secondary loop cycle. Given such high pressure within the secondary loop, the external chemical dosing device needs to provide a pressure higher than the secondary loop pressure to create a pressure difference between the dosing device and the secondary loop, allowing the chemical solution to be forced into the secondary loop. Therefore, existing technologies provide high-pressure dosing devices. These devices utilize the high-pressure environment of the dosing tank to force the chemical solution from the tank into the secondary loop, thus achieving chemical dosing in the secondary loop.

[0004] Existing high-pressure dosing systems require pressurization and pressure-maintaining devices as part of the power system. These devices provide sufficient internal pressure to the dosing unit and maintain that pressure, ensuring timely delivery of adequate pressure when needed. Furthermore, high-pressure dosing systems place high demands on the dosing tank. Therefore, high-pressure dosing systems require additional pressure-maintaining devices and impose higher pressure resistance requirements on the tank, posing greater challenges to the safety and cost of nuclear power plants. Consequently, there is a need for a dosing system that is cost-effective, less demanding in terms of pressure resistance, and still provides greater safety. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a non-powered dosing device to address the issue of higher costs associated with existing high-pressure dosing devices.

[0006] To address the aforementioned issues, this utility model provides a non-powered dosing device, comprising an inlet pipe, a dosing tank, an outlet pipe, and a secondary circuit pipe, wherein the dosing tank has a first interface, a second interface, and a dosing port.

[0007] The secondary loop includes a first position located upstream and a second position located downstream. The liquid pressure at the first position is greater than the liquid pressure at the second position, and the liquid in the secondary loop flows from the first position to the second position.

[0008] The inlet end of the inlet pipe extends into the first position, the outlet end of the inlet pipe is connected to the first interface, the inlet end of the inlet pipe opens in the counter-current direction, and the opening plane of the inlet end of the inlet pipe intersects with the liquid flow direction in the secondary circuit pipe; an inlet valve is provided on the inlet pipe, and the inlet valve is used to control the opening and closing of the inlet pipe.

[0009] The inlet end of the outlet pipe is connected to the second interface, and the outlet end of the outlet pipe extends into the second position of the secondary circuit pipe.

[0010] Optionally, the opening face of the inlet end of the inlet pipe is perpendicular to the liquid flow direction of the secondary circuit pipe.

[0011] Optionally, the outlet end of the inlet pipe extends into the dosing tank; along the radial direction of the dosing tank, the outlet end of the inlet pipe is offset from the center of the cross-section of the dosing tank.

[0012] Optionally, the inlet pipe extends obliquely into the dosing tank, and the axis of the outlet end of the inlet pipe forms an angle with the axis of the dosing tank.

[0013] Optionally, the inlet pipe includes a first pipe and a second pipe, wherein the end of the first pipe away from the second pipe constitutes the inlet end of the inlet pipe;

[0014] The length directions of the first pipe and the second pipe are at a non-zero angle, and the end of the second pipe furthest from the first pipe extends into the dosing tank.

[0015] Optionally, the inlet pipe includes a plurality of sequentially connected sub-pipes, the diameter of which gradually increases from the inlet end to the outlet end of the inlet pipe.

[0016] Optionally, the inlet end of the outlet pipe is connected to a first preset position of the dosing tank, and the outlet end of the inlet pipe is connected to a second preset position of the dosing tank. The first preset position and the second preset position are located at different axial heights of the dosing tank.

[0017] Optionally, the outlet pipe is provided with an outlet valve, which is used to control the opening and closing of the outlet pipe.

[0018] Optionally, the dosing port is provided with an inlet pipe, and the inlet pipe is provided with a dosing valve, which is used to control the opening and closing of the inlet pipe.

[0019] Optionally, the outlet pipe extends obliquely into the secondary circuit pipe, such that the opening direction of the outlet end of the outlet pipe faces the direction of liquid flow in the secondary circuit pipe.

[0020] The present invention provides a non-powered dosing device. Compared with the prior art, which uses a high-pressure device to inject liquid medicine into a secondary loop pipeline, this application uses the pressure difference between the first and second positions of the secondary loop pipeline to inject liquid medicine into the secondary loop pipeline. This reduces the investment in high-pressure holding devices, lowers the cost of injecting liquid medicine, and reduces the pressure resistance requirements of the dosing tank, thereby reducing costs. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the non-powered dosing device provided in one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of one structure of the inlet pipe of the non-powered dosing device provided in one embodiment of the present invention.

[0024] The reference numerals in the accompanying drawings are as follows:

[0025] 1. Inlet pipe; 11. Inlet valve; 12. First pipeline; 13. Second pipeline; 14. Sub-pipe; 2. Dosing tank; 21. Adding pipe; 22. Dosing valve; 3. Outlet pipe; 31. Outlet valve; 9. Secondary circuit pipeline. Detailed Implementation

[0026] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figures 1 to 2 As shown, one embodiment of this utility model provides a non-powered dosing device, including an inlet pipe 1, a dosing tank 2, an outlet pipe 3, and a secondary loop pipe 9. The dosing tank 2 has a first interface, a second interface, and a dosing port. The secondary loop pipe includes a first position upstream and a second position downstream. The liquid pressure at the first position is greater than the liquid pressure at the second position, and the liquid in the secondary loop pipe flows from the first position to the second position. The inlet end of the inlet pipe 1 is adapted to extend into the first position of the secondary loop pipe 9, and the outlet end of the inlet pipe 1 is connected to the first interface. The inlet end of the inlet pipe opens in the counter-current direction, and the open end face of the inlet end of the inlet pipe 1 intersects with the liquid flow direction of the secondary loop pipe 9 to guide the liquid in the secondary loop pipe 9 into the inlet pipe 1. An inlet valve 11 is provided on the inlet pipe 1 to control the opening and closing of the inlet pipe 1. The inlet end of the outlet pipe 3 is connected to the second interface, and the outlet end of the outlet pipe 3 is connected to the second position of the secondary loop pipe 9. The liquid pressure at the first position is greater than the liquid pressure at the second position.

[0030] Reference Figure 1 and Figure 2In the diagram, the three parallel arrows in the secondary loop pipe 9 represent the downstream flow direction of the liquid within the secondary loop pipe, while the direction opposite to the downstream flow direction is the upstream flow direction. In this application, the first position is the high-pressure side of the secondary loop pipe 9, and the second position is the low-pressure side. When the dosing tank 2 needs to be filled, the drug is added through the dosing port, for example, a solution to adjust the pH value of the secondary loop pipe 9 is added to the dosing tank 2. At this time, the inlet valve 11 is closed. When the secondary loop pipe 9 needs to be filled with a solution, the inlet valve 11 is opened, and the high-pressure side of the secondary loop pipe 9 enters the dosing tank 2 through the inlet pipe 1, carrying the solution from the dosing tank 2 into the secondary loop pipe 9 through the outlet pipe 3, thus completing the dosing action. When the secondary loop pipe 9 does not need to be filled with a solution, the inlet valve 11 is closed.

[0031] Compared to existing technologies that use high-pressure devices to inject liquid medicine into the secondary loop pipe 9, this embodiment fully utilizes the high-pressure environment and pressure difference between the first and second positions of the secondary loop pipe 9. Specifically, without power, the liquid in the dosing tank is carried into the secondary loop pipe by the pressure difference of the secondary loop pipe. This eliminates the need for other pressurizing devices in the dosing system, reducing the cost of injecting liquid medicine. At the same time, it reduces the pressure resistance requirements of the dosing tank 2, thereby reducing costs.

[0032] Furthermore, to ensure the high-pressure liquid at the first position within the secondary loop pipe 9 can smoothly enter the inlet pipe 1, the inlet end of the inlet pipe 1 is extended into the secondary loop pipe 9, with the inlet end facing the counter-current direction within the secondary loop pipe 9. Additionally, to maximize the connection between the secondary loop pipe 9 and the inlet pipe 1, the inlet end of the inlet pipe 1 is perpendicular to the downstream direction of the liquid at the first position within the secondary loop pipe 9, and the opening of the inlet end of the inlet pipe 1 faces the counter-current direction of the secondary loop pipe 9. Through this arrangement, i.e., the inlet end face of the inlet pipe 1 intersects with the liquid flow direction of the secondary loop pipe 9 in this embodiment, it is more conducive to guiding the liquid from the secondary loop pipe 9 into the inlet pipe 1, thereby facilitating the injection of the drug solution into the secondary loop pipe 9.

[0033] In this embodiment, the first and second interfaces are formed by through holes in the dosing tank 2. The first interface and the inlet pipe 1 are connected by welding, and the second interface and the outlet pipe 3 are connected by welding. In other embodiments, the first and second interfaces can be pipes with flanges at the ends. The first interface and the inlet pipe 1 are connected by flanges, and the second interface and the outlet pipe 3 are connected by flanges.

[0034] More preferably, the opening face of the inlet end of the inlet pipe 1 is perpendicular to the liquid flow direction of the secondary loop pipe 9. In this embodiment, in order to maximize the guidance of the liquid flow direction of the secondary loop pipe 9, the opening face of the inlet end of the inlet pipe 1 is perpendicular to the liquid flow direction of the secondary loop pipe 9, so that the liquid in the secondary loop pipe 9 can more easily enter the inlet pipe 1.

[0035] The inlet end of the outlet pipe 3 is connected to the first preset position of the dosing tank 2, and the outlet end of the inlet pipe 1 is connected to the second preset position of the dosing tank 2. The first and second preset positions are located at different axial heights of the dosing tank 2. In short, the outlet pipe 3 and the inlet pipe 1 are connected to different heights of the dosing tank 2. When the liquid in the secondary loop pipe 9 enters the dosing tank 2, it extends the flow path of the liquid in the secondary loop pipe 9, thereby mixing the liquid and the medicine more effectively. This ensures that the medicine flows into the secondary loop pipe 9 along with the liquid from the outlet pipe 3. Conversely, if the outlet pipe 3 and the inlet pipe 1 are on the same horizontal plane, or even worse, if the inlet end of the outlet pipe 3 is directly opposite the outlet end of the inlet pipe 1, the liquid entering the dosing tank 2 from the inlet pipe 1 will easily flow directly out of the outlet pipe 3, making it difficult to draw the liquid in the dosing tank 2 into the secondary loop pipe 9.

[0036] In one embodiment, the outlet end of the inlet pipe 1 extends into the dosing tank 2; along the radial direction of the dosing tank 2, the outlet end of the inlet pipe 1 is offset from the center of the cross-section of the dosing tank 2. In this embodiment, the outlet end of the inlet pipe 1 is offset from the radial center of the dosing tank 2, so that after the liquid enters the dosing tank 2 from the inlet pipe 1, it is easy to form eddies or turbulence in the radial plane (horizontal plane) of the dosing tank 2, thereby driving the flow of the medicine in the dosing tank 2, thereby accelerating the flow of the medicine in the dosing tank 2 into the secondary loop pipe 9. Furthermore, since the liquid on the high-pressure side of the secondary loop pipe 9 will instantly reach the dosing tank 2 after the inlet valve 11 is opened, it will generate pressure and impact on the inner wall of the dosing tank 2; in addition, when the pressure difference between the high-pressure side and the low-pressure side is too large, it will also put forward higher pressure resistance requirements for the dosing tank 2, and may even damage the tank body. Due to the eddies generated in the dosing tank 2, the adverse effects of the high pressure difference and instantaneous impact on the dosing tank 2 are reduced.

[0037] In one embodiment, the inlet pipe 1 extends obliquely into the dosing tank 2, with the axis of the outlet end of the inlet pipe 1 forming an angle with the axis of the dosing tank 2. This arrangement easily creates eddies or turbulence in the axial direction (height direction) of the dosing tank 2, thereby driving the flow of the liquid medicine within the dosing tank 2 and accelerating the flow of the liquid medicine into the secondary circuit pipe 9. Furthermore, the eddies generated within the dosing tank 2 reduce the adverse effects of high pressure differentials and instantaneous impact forces on the dosing tank 2.

[0038] In other embodiments, the axial direction of the outlet end of the inlet pipe 1 is radially connected to the first interface, parallel to the dosing tank 2.

[0039] Reference Figure 1 In one embodiment, the inlet pipe 1 includes a first pipe 12 and a second pipe 13. The end of the first pipe 12 furthest from the second pipe 13 constitutes the inlet end of the inlet pipe 1. The length direction of the first pipe 12 and the length direction of the second pipe 13 form a non-zero angle, and the end of the second pipe 13 furthest from the first pipe 12 extends into the dosing tank 2. In this embodiment, the inlet pipe 1 is formed by two pipes, the first pipe 12 and the second pipe 13, which form an angle in their length directions, to adapt to different installation environments.

[0040] In other embodiments, the inlet pipe 1 is a straight pipe, with one end extending into the secondary circuit pipe 9 and the other end extending into the dosing tank 2, which has a simple structure and lower cost.

[0041] Reference Figure 2 In one embodiment, the inlet pipe 1 includes a plurality of sequentially connected sub-pipes 14, the diameter of which gradually increases from the inlet end to the outlet end of the inlet pipe 1. In this embodiment, the diameter of the inlet pipe 1 increases in a stepwise manner, so that the liquid flow velocity decreases as the liquid flows from the inlet end to the outlet end of the inlet pipe 1 within the pipe with the continuously increasing inner diameter. This gradually reduces the impact force of the liquid, reduces the adverse effects of the impact force exerted on the dosing tank by the high pressure differential, reduces the strong impact of the high-pressure liquid on the inlet pipe 1, and reduces the probability of damage to the inlet pipe 1.

[0042] In one embodiment, an outlet valve 31 is provided on the outlet pipe 3, which is used to control the opening and closing of the outlet pipe 3. In this embodiment, an outlet valve 31 is installed on the outlet pipe 3 of the dosing tank 2 to control the opening or closing of the outlet pipe 3.

[0043] In one embodiment, an inlet pipe 21 is provided on the inlet, and an inlet valve 22 is provided on the inlet pipe 21. The inlet valve 22 is used to control the opening and closing of the inlet pipe 21.

[0044] In one embodiment, the axis of the outlet pipe 3 is perpendicular to the secondary loop pipe 2, so that the outlet direction of the outlet pipe 3 is perpendicular to the liquid flow direction of the secondary loop pipe 2. This connection method between the outlet pipe 3 and the secondary loop pipe 2 is relatively simple and easy to weld.

[0045] In one embodiment, the outlet pipe 3 extends obliquely into the secondary loop pipe 2, such that the opening of the outlet end of the outlet pipe 3 faces the direction of liquid flow in the secondary loop pipe 2. When the liquid comes out from the outlet end of the outlet pipe 3, the flow direction of the liquid is close to the flow direction of the secondary loop pipe 2, so as to reduce the negative impact of the liquid on the liquid flow in the secondary loop pipe 2.

[0046] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A passive dosing device, characterized in that It includes an inlet pipe, a dosing tank, an outlet pipe, and a secondary circuit pipe, wherein the dosing tank has a first interface, a second interface, and a dosing port; The secondary loop includes a first position located upstream and a second position located downstream. The liquid pressure at the first position is greater than the liquid pressure at the second position, and the liquid in the secondary loop flows from the first position to the second position. The inlet end of the inlet pipe extends into the first position, the outlet end of the inlet pipe is connected to the first interface, the inlet end of the inlet pipe opens in the counter-current direction, and the opening plane of the inlet end of the inlet pipe intersects with the liquid flow direction in the secondary circuit pipe; an inlet valve is provided on the inlet pipe, and the inlet valve is used to control the opening and closing of the inlet pipe. The inlet end of the outlet pipe is connected to the second interface, and the outlet end of the outlet pipe extends into the second position of the secondary circuit pipe.

2. The unpowered dosing apparatus of claim 1, wherein, The opening face of the inlet end of the inlet pipe is perpendicular to the liquid flow direction of the secondary circuit pipe.

3. The unpowered dosing apparatus of claim 1, wherein, The outlet end of the inlet pipe extends into the dosing tank; along the radial direction of the dosing tank, the outlet end of the inlet pipe is offset from the center of the cross-section of the dosing tank.

4. The unpowered dosing apparatus of claim 1, wherein, The inlet pipe extends obliquely into the dosing tank, and the axis of the outlet end of the inlet pipe forms an angle with the axis of the dosing tank.

5. The non-powered dosing device according to claim 1, characterized in that, The inlet pipe includes a first pipe and a second pipe, and the end of the first pipe away from the second pipe constitutes the inlet end of the inlet pipe. The length directions of the first pipe and the second pipe are at a non-zero angle, and the end of the second pipe furthest from the first pipe extends into the dosing tank.

6. The non-powered dosing device according to claim 1, characterized in that, The inlet pipe includes multiple sub-pipes connected in sequence, and the diameter of the sub-pipes gradually increases from the inlet end of the inlet pipe to the outlet end of the inlet pipe.

7. The non-powered dosing device according to claim 1, characterized in that, The inlet end of the liquid outlet pipe is connected to a first preset position of the dosing tank, and the outlet end of the liquid outlet pipe is connected to a second preset position of the dosing tank. The first preset position and the second preset position are located at different axial heights of the dosing tank.

8. The non-powered dosing device according to claim 1, characterized in that, The outlet pipe is equipped with an outlet valve, which is used to control the opening and closing of the outlet pipe.

9. The non-powered dosing device according to claim 1, characterized in that, The dosing port is equipped with an inlet pipe, and the inlet pipe is equipped with a dosing valve, which is used to control the opening and closing of the inlet pipe.

10. The non-powered dosing device according to claim 1, characterized in that, The outlet pipe extends obliquely into the secondary circuit pipe, such that the opening of the outlet end of the outlet pipe faces the direction of liquid flow in the secondary circuit pipe.

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