Device for inhibiting carbonation and tritium rising of cooling water of nuclear power station equipment

Abstract

The utility model discloses a nuclear power station equipment cooling water carbonation and tritium rising inhibiting device which comprises an overflow pipe with an inlet arranged at a preset position in a head box, a drainage collecting device, a drainage pipeline and a water supplementing pipeline, and an outlet of the overflow pipe extends into the drainage collecting device and goes deep below the liquid level of the drainage collecting device. The drainage pipeline and the water replenishing pipeline respectively extend into the drainage collecting device or respectively communicate with the drainage collecting device; the outlet of the overflow pipe is closer to the bottom of the drainage collecting device than the front end of the drainage pipeline. The nuclear power station equipment cooling water carbonation and tritium rising inhibiting device can be used in a nuclear power station equipment cooling water system, the inlet of the overflow pipe always goes deep below the liquid level, gas is prevented from flowing into the head box through the overflow pipe, and cooling water carbonation and tritium rising can be inhibited.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling water for nuclear power plant equipment, in particular to a device for suppressing carbonation and tritium rise of cooling water for nuclear power plant equipment. Background Art

[0002] The pH value is the "OTS (nuclear safety related)" parameter of the RRI (equipment cooling water) system. Generally, it fluctuates and needs to be adjusted and controlled by adding alkaline substances such as trisodium phosphate.

[0003] At present, the water quality of RRI is affected by carbonation. When the phosphate content remains unchanged, the pH value slowly decreases. In order to ensure that the pH value of the system is within the expected range, trisodium phosphate is added to RRI from time to time. However, as the operation time of the random group increases, the phosphate and pH show a two-level differentiation phenomenon, the phosphate gradually approaches the upper limit, and the pH gradually decreases.

[0004] In addition, when the RRI water is carbonated, the tritium content in the system will also increase. The expected value of tritium in the RRI system is 0.4MBq / t in the technical specifications, which will be an important indicator for judging whether the primary circuit is leaking into the cooling water. Therefore, the impact of water carbonation and tritium content on the OTS of the RRI system is extremely important. How to suppress water carbonation and the increase of tritium content is an urgent problem to be solved. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment.

[0006] The utility model solves the technical problem by adopting the following technical solution: a device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment, comprising an overflow pipe with an inlet arranged at a preset position in a head box, a drainage collection device, a drainage pipeline and a water supply pipeline, the outlet of the overflow pipe extends into the drainage collection device and penetrates below the liquid level of the drainage collection device, the drainage pipeline and the water supply pipeline respectively extend into the drainage collection device or are respectively connected with the drainage collection device;

[0007] Wherein, the outlet of the overflow pipe is closer to the bottom of the drainage collection device than the front end of the drainage pipeline.

[0008] Preferably, in the device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment described in the utility model, the drainage pipeline includes a drainage pipe, a drainage valve of an external power supply, and a drainage pump, the drainage valve and the drainage pump are respectively connected to the drainage pipe, and the drainage valve is arranged at the front end of the drainage pump.

[0009] Preferably, in the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment described in the utility model, the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment also includes a liquid level gauge, which is arranged inside the drainage collection device and detects the water level thereof.

[0010] Preferably, in the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment described in the utility model, the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment also includes a controller, and the controller is electrically connected to the liquid level meter, the drain valve and the drain pump respectively.

[0011] Preferably, in the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment described in the utility model, the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment also includes an alarm, and the alarm is electrically connected to the controller.

[0012] Preferably, in the device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment described in the utility model, the outlet of the overflow pipe is 15 mm to 25 mm away from the bottom of the drainage collection device.

[0013] Preferably, in the device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment described in the utility model, the front end of the drain pipe is 25 mm to 35 mm away from the bottom of the drain collection device.

[0014] Preferably, in the device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment described in the utility model, the water supply pipeline includes a water supply pipe and a water supply valve arranged at the front end of the water supply pipe.

[0015] Preferably, in the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment described in the utility model, the water supply valve is a manual valve; or the water supply valve is an automatic valve, and the automatic valve is electrically connected to the controller.

[0016] Preferably, in the device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment described in the utility model, the drainage collection device is a pit or a water storage tank.

[0017] By implementing the utility model, the following beneficial effects are achieved:

[0018] The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment of the utility model can be used in the cooling water system of nuclear power plant equipment. The inlet of the overflow pipe is always deep below the liquid surface to prevent gas from flowing into the header box through the overflow pipe, thereby suppressing carbonation and tritium rise of cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1 The utility model is a schematic diagram of the structure of a device for suppressing carbonation and tritium rise of cooling water in nuclear power plant equipment according to an embodiment of the utility model. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0022] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0023] In the description of the utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, "multiple" means two or more.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or a chemical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0025] See also Figure 1One embodiment of the utility model discloses a device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment. The device is used in the cooling water system of nuclear power plant equipment, referred to as RRI system, to prevent carbonation of cooling water and rise of tritium content in cooling water, which threatens nuclear safety. Among them, the cooling water system of nuclear power plant equipment includes a header box 100, a cooling pipeline (not shown in the figure) and a negative pressure exhaust device 200. The inlet and outlet of the cooling pipeline are connected to the header box 100. The position of the header box 100 is higher than the ground. The negative pressure exhaust device 200 is used to regulate the internal air pressure of the header box 100. The relevant settings of the cooling water system of nuclear power plant equipment are prior art and will not be elaborated here.

[0026] The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment of the utility model comprises an overflow pipe 1, a drainage collection device 2, a drainage pipeline 3 and a water supply pipeline 4, the outlet of the overflow pipe 1 extends into the drainage collection device 2 and penetrates below the liquid level of the drainage collection device 2, and the drainage pipeline 3 and the water supply pipeline 4 extend into the drainage collection device 2 or are connected to the drainage collection device 2 respectively. Among them, the outlet of the overflow pipe 1 is closer to the bottom of the drainage collection device 2 than the front end of the drainage pipeline 3. The drainage collection device 2 can also be used to collect tritium-containing water from other radioactive systems. After the tritium-containing water evaporates, the tritium will also be dissolved into the air with the evaporation. When the water inside the drainage collection device 2 is extracted through the drainage pipeline 3, the water level can be physically prevented from being lower than the outlet of the overflow pipe 1, so as to achieve the purpose of the outlet of the overflow pipe 1 always being below the water surface, isolating the outside air from forming convection with the air in the header box 100 through the overflow pipe 1.

[0027] The preset position can be set according to actual needs, for example, lower than the outlet position of the cooling pipeline and higher than the inlet position of the cooling pipeline. The drainage collection device 2 is a pit or a water storage tank, and the water storage tank can be a semi-enclosed or fully enclosed type. Preferably, the outlet of the overflow pipe 1 is 15mm to 25mm away from the bottom of the drainage collection device 2.

[0028] The device for suppressing carbonation and tritium rise of cooling water in nuclear power plant equipment of the utility model isolates the outside air from forming convection with the air in the header box 100 through the overflow pipe 1, preventing CO2 in the air from entering the header box 100 due to suction by the negative pressure exhaust device 200, and then entering the RRI system to cause carbonation. It also prevents tritium-containing water from evaporating from other radioactive systems and air from entering the header box 100 by the negative pressure exhaust device 200, and then entering the RRI system to cause tritium rise in the RRI system. Compared with the existing related technologies, the carbonation of RRI can be greatly alleviated, and phosphate and pH show better synergy, and will not decrease over time.

[0029] Further, in some embodiments, in order to facilitate drainage of the drainage collection device 2, the drainage pipeline 3 includes a drainage pipe 31, a drainage valve (not shown) of an external power supply, and a drainage pump 32. The drainage valve and the drainage pump 32 are respectively connected to the drainage pipe 31. The drainage valve is arranged at the front end of the drainage pump 32. The drainage pipe 31 extends into the drainage collection device 2 or is connected to the drainage collection device 2. The drainage valve is opened and the drainage pump 32 is started to pump out the water stored in the drainage collection device 2. Preferably, the front end of the drainage pipe 31 is 25 mm to 35 mm away from the bottom of the drainage collection device 2 to prevent the water level from being lower than the 25 mm to 35 mm water storage height in the drainage collection device 2 when pumping water.

[0030] Further, in some embodiments, in order to monitor the water level and prevent the water level from being too low, the device for suppressing the carbonation of cooling water and the rise of tritium in nuclear power plant equipment also includes a liquid level meter 5, a controller and an alarm. The controller and the alarm are not shown in the figure. The liquid level meter 5 is arranged inside the drainage collection device 2 and detects its water level. The controller is electrically connected to the liquid level meter 5, the drainage valve, the drainage pump 32 and the alarm respectively. The liquid level meter 5 can be a trigger type liquid level meter 5 or a through-and-closed type liquid level meter 5. When the water stored in the drainage collection device 2 reaches a certain height, the liquid level meter 5 uploads a signal to the controller, and the drainage pump 32 will automatically start the drainage pump 32 according to the liquid level arrival instruction given by the liquid level meter 5 until the drainage stops at 25mm to 35mm from the bottom of the pit. When the liquid level meter 5 detects that the water level is too low, the controller controls the alarm to sound an alarm, reminding the staff to replenish water through the water replenishment pipeline 4, and further preventing the outlet of the overflow pipe 1 from being higher than the water surface.

[0031] Further, in some embodiments, the water replenishment pipeline 4 includes a water replenishment pipe 41 and a water replenishment valve 42 provided at the front end of the water replenishment pipe 41. The water replenishment valve 42 is a manual valve or an automatic valve, and can perform manual water replenishment or automatic water replenishment according to actual needs. Preferably, when the water replenishment valve 42 is an automatic valve, the automatic valve can be electrically connected to the controller. When the liquid level meter 5 detects that the water level is too low, the liquid level meter 5 uploads a signal to the controller, and the automatic valve opens the automatic valve according to the liquid level arrival instruction given by the liquid level meter 5 to replenish water for the drainage collection device 2.

[0032] By implementing the utility model, the following beneficial effects are achieved:

[0033] The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment of the utility model can be used in the cooling water system of nuclear power plant equipment. The inlet of the overflow pipe 1 is always deep below the liquid surface to prevent gas from flowing into the header box 100 through the overflow pipe 1, thereby suppressing carbonation and tritium rise of cooling water.

[0034] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the utility model; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the utility model, the above embodiments or technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model, that is, the embodiments described in "some embodiments" can be freely combined with any of the above and below embodiments; therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should fall within the scope of the claims of the utility model.

Claims

1. A device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment, characterized in that: It comprises an overflow pipe (1) whose inlet is arranged at a preset position in a head box (100), a drainage collection device (2), a drainage pipeline (3) and a water replenishment pipeline (4), wherein the outlet of the overflow pipe (1) extends into the drainage collection device (2) and penetrates below the liquid level of the drainage collection device (2), and the drainage pipeline (3) and the water replenishment pipeline (4) respectively extend into the drainage collection device (2) or are respectively connected to the drainage collection device (2); Wherein, the outlet of the overflow pipe (1) is closer to the bottom of the drainage collection device (2) than the front end of the drainage pipeline (3).

2. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 1, characterized in that: The drainage pipeline (3) comprises a drainage pipe (31), a drainage valve connected to an external power source, and a drainage pump (32); the drainage valve and the drainage pump (32) are respectively connected to the drainage pipe (31); and the drainage valve is arranged at the front end of the drainage pump (32).

3. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 2, characterized in that: The device for suppressing carbonation and tritium rise in cooling water of nuclear power plant equipment also includes a liquid level meter (5), which is arranged inside the drainage collection device (2) and detects the water level thereof.

4. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 3, characterized in that: The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment also includes a controller, which is electrically connected to the liquid level meter (5), the drainage valve and the drainage pump (32) respectively.

5. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 4, characterized in that: The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment also includes an alarm, and the alarm is electrically connected to the controller.

6. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 1, characterized in that: The outlet of the overflow pipe (1) is 15 mm to 25 mm away from the bottom of the drainage collection device (2).

7. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 2, characterized in that: The front end of the drainage pipe (31) is 25 mm to 35 mm away from the bottom of the drainage collection device (2).

8. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 4, characterized in that: The water replenishment pipeline (4) comprises a water replenishment pipe (41) and a water replenishment valve (42) arranged at the front end of the water replenishment pipe (41).

9. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 8, characterized in that: The water supply valve (42) is a manual valve; or the water supply valve (42) is an automatic valve, and the automatic valve is electrically connected to the controller.

10. The device for suppressing carbonation and tritium rise of cooling water of nuclear power plant equipment according to claim 1, characterized in that: The drainage collection device (2) is a pit or a water storage tank.

Images