Defoaming device for nuclear power station

Abstract

The utility model is suitable for the technical field of water treatment, and provides a nuclear power station defoaming device which comprises a chemical mixing water tank and a first pipeline, the chemical mixing water tank is provided with a water inlet, a chemical feeding port and a first water outlet, the water inlet is used for being communicated with a water source, and the water inlet end of the first pipeline is communicated with the first water outlet; the water outlet end of the first pipeline is used for being communicated with a siphon wellhead, and a first switch is arranged on the first pipeline. The defoaming device for the nuclear power station is arranged between a water source and a siphon wellhead instead of being arranged in a circulating water defoaming and dosing plant in the prior art, is simple in structure and short in manufacturing and mounting period, and is convenient to use during construction, debugging and maintenance of the defoaming and dosing device in the circulating water defoaming and dosing plant. The defoaming function can be quickly provided for cooling water for unit operation, and the quality and the cooling function of the cooling water are ensured.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a defoaming device for nuclear power plants. Background Technology

[0002] Currently, all megawatt-class pressurized water reactor nuclear power plants in China use direct seawater cooling for their circulating cooling water. To reduce the impact of marine organisms in the circulating cooling water on the safe operation of the nuclear power plant, chlorination is required when the cooling water enters the circulating water pump room for sterilization and disinfection, inhibiting microbial growth. After the circulating cooling water comes into contact with air, bubbles mix with marine organism remains, debris, and suspended solids in the seawater through mixing, coagulation, and flotation to form a white or grayish-white mixture floating on the water surface, i.e., foam. The siphon well drainage outlets of nuclear power plants are designed with physical defoaming measures, which can largely suppress foam generation. However, the physical defoaming ability is affected by multiple factors such as seawater quality, water temperature, and tide level. Therefore, nuclear power plants also need to add chemical agents for defoaming, i.e., by adding defoaming agents to the circulating water system to change the physicochemical properties of the water to eliminate foam.

[0003] The defoaming dosing equipment in nuclear power plants is located in the circulating water defoaming dosing plant. However, due to factors such as the layout of the nuclear power plant site, civil engineering and installation progress, the commissioning time of the formal defoaming system usually does not meet the defoaming schedule requirements of the nuclear power plant. Furthermore, once the defoaming dosing equipment in the defoaming dosing plant needs to be inspected, repaired, or cleaned, it will result in a long period of time without defoaming, affecting the subsequent use of cooling water, and in severe cases, even affecting the normal operation of the unit. Utility Model Content

[0004] The purpose of this application is to provide a nuclear power plant defoaming device, which aims to solve the technical problem that existing defoaming dosing devices cannot meet defoaming requirements due to long construction or maintenance times.

[0005] The embodiments of this application are implemented as follows: a nuclear power plant defoaming device includes:

[0006] A mixing tank for chemical preparation includes an inlet, a dosing port, and a first outlet, wherein the inlet is used to connect to a water source; and

[0007] The first pipeline has an inlet end connected to the first outlet end, and an outlet end connected to the siphon well opening. A first switch is provided on the first pipeline.

[0008] In one embodiment, the first pipeline further includes a first mixer and a second switch, the first mixer being disposed between the first switch and the first outlet, and the second switch being disposed between the first mixer and the water source.

[0009] In one embodiment, the first mixer is a mixed-flow injector, which includes a nozzle, an intake chamber, a mixing chamber, and a diffuser connected in sequence, and the first switch and the second switch are connected in parallel to the nozzle.

[0010] In one embodiment, the mixing tank further includes a second outlet, and the nuclear power plant defoaming device further includes a second pipeline. The inlet end of the second pipeline is connected to the second outlet, and the outlet end of the second pipeline is used to connect to the siphon wellhead. A fourth switch is provided on the second pipeline.

[0011] In one embodiment, the second pipeline further includes a second mixer and a fifth switch, the second mixer being disposed between the fourth switch and the second outlet, and the fifth switch being disposed between the second mixer and the water source.

[0012] In one embodiment, the second mixer is a mixed-flow injector, which includes a nozzle, an intake chamber, a mixing chamber, and a diffuser connected in sequence, and the fourth switch and the fifth switch are connected in parallel to the nozzle.

[0013] In one embodiment, the first water outlet and the second water outlet are located at the bottom of the mixing tank, and the first pipeline and the second pipeline are located below the mixing tank.

[0014] In one embodiment, the nuclear power plant defoaming device further includes a fixed base, and the mixing tank, the first pipeline, and the second pipeline are all fixed on the fixed base.

[0015] In one embodiment, the water inlet is located at the bottom or top of the mixing tank, and the dosing port is located at the top of the mixing tank.

[0016] In one embodiment, the nuclear power plant defoaming device further includes a seventh switch, which is disposed between the water source and the water inlet, and the seventh switch is a manual switch.

[0017] The nuclear power plant defoaming device provided in this application has the following advantages:

[0018] The nuclear power plant defoaming device provided in this application embodiment is installed between the water source and the siphon wellhead, instead of being installed in the circulating water defoaming and dosing plant as in the prior art. It has a simple structure and a short manufacturing and installation cycle. During the construction, commissioning and maintenance of the defoaming and dosing device in the circulating water defoaming and dosing plant, it can quickly provide defoaming function for the cooling water used in unit operation, ensuring the quality and cooling function of the cooling water. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the nuclear power plant defoaming device provided in the first embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the structure of the nuclear power plant defoaming device provided in the second embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the nuclear power plant defoaming device provided in the third embodiment of this application.

[0023] The markings in the diagram mean:

[0024] 100 - Defoaming device for nuclear power plants;

[0025] 4-Water source;

[0026] 5-Mixing tank, 51-Inlet, 52-Dosing port, 53-First outlet, 54-Second outlet;

[0027] 6-First pipeline, 61-First switch, 62-Second switch, 63-Third switch, 64-First mixer;

[0028] 7-Second pipeline, 71-Fourth switch, 72-Fifth switch, 73-Sixth switch, 74-Second mixer;

[0029] 8-Seventh Switch;

[0030] 90 - Fixed base, 91 - Siphon wellhead. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly fixed to or set on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the purpose of 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 patent. The terms "first" and "second" are used only for the purpose of description and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly specified.

[0033] To illustrate the technical solutions described in this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0034] Please see Figure 1 As shown, a nuclear power plant defoaming device 100 includes a chemical mixing tank 5 and a first pipeline 6. The chemical mixing tank 5 is a hollow container with an inlet 51, a dosing port 52, and a first outlet 53. The inlet 51 is used to connect to a water source 4, and the dosing port 52 is used for technicians to add defoaming chemicals to the chemical mixing tank 5. The inlet end of the first pipeline 6 is used to connect to the first outlet 53, and the outlet end of the first pipeline 6 is used to connect to a siphon well 91. A first switch 61 is provided on the first pipeline 6.

[0035] The defoaming device 100 of the nuclear power plant is located between the water source 4 and the siphon wellhead 91, instead of being located in the circulating water defoaming and chemical dosing plant as in existing technologies. It has a simple structure and a short manufacturing and installation cycle. During the construction, commissioning and maintenance of the defoaming and chemical dosing device in the circulating water defoaming and chemical dosing plant, it can quickly provide defoaming function for the cooling water used in unit operation, ensuring the quality and cooling function of the cooling water.

[0036] When using the nuclear power plant defoaming device 100, technicians add a certain amount of defoaming chemicals to the mixing tank 5 through the dosing port 52, and add a certain amount of water to the mixing tank 5 through the water source 4. The defoaming chemicals are dissolved and mixed to obtain a defoaming solution. Then, by opening the first switch 61, the defoaming solution is supplied to the siphon wellhead 91 through the first pipeline 6 to chemically defoam the cooling water.

[0037] like Figure 1As shown, the nuclear power plant defoaming device 100 also includes a fixed base 90 for fixing and supporting the above-mentioned mixing tank 5 and the first pipeline 6, so as to ensure that the mixing tank 5 and the first pipeline 6 remain stationary at all points, and that the connection at each point is stable and airtight, so as to avoid problems such as shaking and leakage at the connection points during the trial period.

[0038] The fixed base 90 can be a support frame made of metal and / or plastic materials. The bottom of the support frame is fixed to the ground or tabletop.

[0039] The fixed base 90 can be a concrete foundation, and the mixing tank 5 and the first pipeline 6 are fixed on the concrete foundation.

[0040] The material of the mixing tank 5 should be chosen to avoid chemical reactions with the aforementioned defoaming solutions. For example, commonly used defoaming chemicals include alcohols, ethers, fatty acids, and their esters. The pressurized tank can be made of stainless steel, ensuring sufficient strength.

[0041] The defoaming chemicals can be added to the mixing tank 5 in the form of a undiluted solution. In one embodiment, such as... Figure 1 As shown, the nuclear power plant defoaming device 100 also includes a chemical pump (not shown), whose inlet is used to connect to a container of the chemical concentrate, and whose outlet is connected to the dosing port 52.

[0042] The pharmaceutical pump can be an electric pump or a manual pump.

[0043] In one optional embodiment, the chemical pump is designed to be detachably connected to the dosing port 52. For example, the chemical pump can be directly inserted into the dosing port 52, and when it needs to be disassembled, simply raise the outlet of the chemical pump away from the dosing port 52. The purpose of this design is that the mixing tank 5 can be configured to store a large amount of defoaming solution, and the container of the concentrate does not need to be constantly connected to the dosing port 52. When it is necessary to prepare the defoaming solution in the mixing tank 5, the chemical pump can be connected to the dosing port 52.

[0044] Please see Figure 1 As shown, in one embodiment, the first outlet 53 is located at the bottom of the mixing tank 5, which is positioned above the first pipeline 6. This arrangement ensures that when the first switch 61 is turned on, the defoaming solution in the mixing tank 5 can automatically flow downwards under gravity. This saves power consumption, eliminating the need for an additional power source to introduce the defoaming solution into the first pipeline 6.

[0045] Optionally, the water inlet 51 can be located at the bottom of the mixing tank 5 or at the top of the mixing tank 5.

[0046] Among them, such as Figure 2As shown, the water inlet 51 is located at the bottom of the mixing tank 5. Water from the water source 4 enters the mixing tank 5 and flows fully from bottom to top, which is beneficial for the dissolution of defoaming chemicals.

[0047] like Figure 1 As shown, the water inlet 51 is located at the top of the mixing tank 5, which facilitates a simpler connection between the water inlet 51 and the water source 4.

[0048] Optionally, the dosing port 52 is located at the top of the mixing tank 5, which facilitates connection and operation with the chemical pump.

[0049] Please see Figure 1 As shown, in one embodiment, the first pipeline 6 further includes a first mixer 64 and a second switch 62. The first mixer 64 is disposed between the first switch 61 and the first outlet 53, and the second switch 62 is disposed between the first mixer 64 and the water source 4. The purpose of placing the first mixer 64 before the first switch 61 and after the first outlet 53 is to further mix and dissolve the defoaming agent using water from the water source 4, thereby reducing the risk of incomplete dissolution and mixing of the defoaming chemicals in the mixing tank 5, and thus improving the utilization rate and defoaming effect of the defoaming agent.

[0050] In this embodiment, the second switch 62 is located between the first mixer 64 and the water source 4. By opening the second switch 62, water from the water source 4 enters the first mixer 64. When the water from the water source 4 enters the first mixer 64, it has a certain flow rate. Compared with the mixing tank 5, it can form a partial negative pressure space in the first mixer 64. This negative pressure causes some of the defoaming liquid in the mixing tank 5 to enter the first mixer 64 and mix with the water again.

[0051] In this way, the remixing of the defoaming solution does not require additional power, which can save energy consumption and simplify the structure of the device.

[0052] In one specific embodiment, the first mixer 64 is a mixed-flow injector, which includes a nozzle, a suction chamber, a mixing chamber, and a diffuser connected in sequence. A first switch 61 and a second switch 62 are connected in parallel to the nozzle. Water from the water source 4 is ejected from the nozzle at a relatively high velocity, creating a negative pressure in the suction chamber, where some of the defoaming agent is drawn in. The defoaming agent and water are further mixed in the mixing chamber. Finally, the diffuser, with its gradually expanding flow area, reduces the fluid velocity and increases the pressure of the mixed fluid. Finally, the mixed defoaming agent enters the siphon wellhead 91.

[0053] Please see Figure 1As shown, in one embodiment, the first pipeline 6 further includes a third switch 63, which is disposed between the first mixer 64 and the siphon wellhead 91. This allows for final control over the connection and disconnection between the first pipeline 6 and the siphon wellhead 91.

[0054] The first switch 61, the second switch 62, and the third switch 63 described above can all be manual switches. That is, all components on the first pipeline 6 are manually operated mechanical structures, without electrical structures, and are suitable for outdoor use. Alternatively, in other optional embodiments, if necessary, at least one of the first switch 61, the second switch 62, and the third switch 63 described above can be an electrically controlled switch.

[0055] Please continue reading Figure 1 As shown, in one embodiment, the nuclear power plant defoaming device 100 further includes a seventh switch 8, which is disposed between the water source 4 pipe and the water inlet 51. The connection between the water source 4 and the mixing tank 5 can be conveniently controlled through the seventh switch 8.

[0056] Optionally, the seventh switch 8 is a manual switch. This also makes the nuclear power plant's defoaming device 100 suitable for outdoor use.

[0057] Please see Figure 3 As shown in one embodiment of this application, the nuclear power plant defoaming device 100 further includes a second pipeline 7, which is connected in parallel with the first pipeline 6 to provide another pathway for supplying defoaming solution to the siphon wellhead 91.

[0058] Specifically, please refer to Figure 3 As shown, the mixing tank 5 also includes a second outlet 54, and the nuclear power plant defoaming device 100 also includes a second pipeline 7. The inlet end of the second pipeline 7 is used to connect to the second outlet 54, and the outlet end of the second pipeline 7 is used to connect to the siphon well 91. A fourth switch 71 is provided on the second pipeline 7.

[0059] After obtaining the defoaming solution in the mixing tank 5, the defoaming solution is supplied to the siphon wellhead 91 via the second pipeline 7 by opening the fourth switch 7, so as to chemically defoam the cooling water.

[0060] The fourth switch 71 and the first switch 61 are independently configured. That is, the first switch 61 and the fourth switch 71 can be opened or closed independently. When a large amount of defoaming solution is needed in the siphon wellhead 91, both the first switch 61 and the fourth switch 71 can be opened simultaneously to connect both the first pipeline 6 and the second pipeline 7 to the siphon wellhead 91. When a small amount of defoaming solution is needed in the siphon wellhead 91, one of the first switch 61 and the fourth switch 71 can be opened to connect one of the first pipeline 6 and the second pipeline 7 to the siphon wellhead 91. If one of the first pipeline 6 or the second pipeline 7 malfunctions, the other can be used to supply defoaming solution to the siphon wellhead 91.

[0061] Thus, the installation of the second pipeline 7 provides more pathways for supplying defoaming solution to the siphon wellhead 91, meets various usage requirements, and further ensures the quality of cooling water.

[0062] like Figure 3 As shown, in one optional embodiment, the second outlet 54 is located at the bottom of the water tank, and the mixing tank 5 is located above the second pipeline 7. When the fourth switch 71 is turned on, the defoaming solution in the mixing tank 5 can automatically flow downwards under the action of gravity. This saves power consumption, eliminating the need for an additional power structure to introduce the defoaming solution into the second pipeline 7.

[0063] Please see Figure 3 As shown, in one embodiment of this application, the second pipeline 7 further includes a second mixer 74 and a fifth switch 72. The second mixer 74 is disposed between the fourth switch 71 and the second outlet 54, and the fifth switch 72 is disposed between the second mixer 74 and the water source 4.

[0064] A second mixer 74 is installed before the fourth switch 71 and after the second outlet 54. This mixer, using water from the water source 4, further mixes and dissolves the defoaming solution, reducing the risk of incomplete dissolution and mixing of the defoaming chemicals in the mixing tank 5, and improving the utilization rate and defoaming effect of the solution. This re-mixing of the defoaming solution requires no additional power, saving energy and simplifying the device structure.

[0065] In one specific embodiment, the second mixer 74 is a mixed-flow injector, which includes a nozzle, a suction chamber, a mixing chamber, and a diffuser connected in sequence. The fourth switch 71 and the fifth switch 72 are connected in parallel to the nozzle. Water from the water source 4 is ejected from the nozzle at a relatively high velocity, creating a negative pressure in the suction chamber, where some of the defoaming agent is drawn in. The defoaming agent and water are further mixed in the mixing chamber. Finally, the diffuser, with its gradually expanding flow area, reduces the fluid velocity and increases the pressure of the mixed fluid. Finally, the mixed defoaming agent enters the siphon wellhead 91.

[0066] Please see Figure 3 As shown, in one embodiment of this application, the second pipeline 7 further includes a sixth switch 73, which is disposed between the second mixer 74 and the siphon wellhead 91.

[0067] The aforementioned fourth switch 71, fifth switch 72, and sixth switch 73 can all be manual switches. That is, all components on the first pipeline 6 are manually operated mechanical structures, without electrical structures, suitable for outdoor use. Alternatively, in other optional embodiments, if necessary, at least one of the aforementioned fourth switch 71, fifth switch 72, and sixth switch 73 can be an electrically controlled switch.

[0068] Existing defoaming dosing devices installed in circulating water defoaming dosing plants have long procurement cycles, high procurement costs, stringent installation requirements, demanding operating environment requirements, and long commissioning periods. The nuclear power plant defoaming device 100 provided in this application embodiment has the following advantages:

[0069] 1. The defoaming solution in the mixing tank 5 can be fully mixed by the upward flow of water;

[0070] 2. The defoaming solution in the mixing tank 5 can automatically flow to the first switch 61 and the fourth switch 71 by gravity, without the need for additional power structure and energy consumption;

[0071] 3. The defoaming agent is further mixed with water by using the water pressure of water source 4 and the mixing jet, without the need for additional power structure and energy consumption;

[0072] 4. It can be made without electrical structure, with short manufacturing and debugging cycles, low installation requirements, and is suitable for outdoor use;

[0073] 5. It can achieve uninterrupted defoaming of cooling water, making up for the long-term unavailability of the defoaming dosing device set in the circulating water defoaming dosing plant, which is conducive to ensuring the operation of the unit.

[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A defoaming device for nuclear power plants, characterized in that, include: A mixing tank has an inlet, a dosing port, and a first outlet, wherein the inlet is used to connect to a water source; as well as The first pipeline has an inlet end connected to the first outlet end, and an outlet end connected to the siphon well opening. A first switch is provided on the first pipeline.

2. The nuclear power plant defoaming device as described in claim 1, characterized in that, The first pipeline also includes a first mixer and a second switch. The first mixer is disposed between the first switch and the first outlet, and the second switch is disposed between the first mixer and the water source.

3. The nuclear power plant defoaming device as described in claim 2, characterized in that, The first mixer is a mixed-flow injector, which includes a nozzle, a suction chamber, a mixing chamber and a diffuser connected in sequence, and the first switch and the second switch are connected in parallel to the nozzle.

4. The nuclear power plant defoaming device as described in claim 1, characterized in that, The mixing tank also includes a second outlet, and the nuclear power plant defoaming device also includes a second pipeline. The inlet of the second pipeline is connected to the second outlet, and the outlet of the second pipeline is used to connect to the siphon wellhead. A fourth switch is provided on the second pipeline.

5. The nuclear power plant defoaming device as described in claim 4, characterized in that, The second pipeline also includes a second mixer and a fifth switch. The second mixer is disposed between the fourth switch and the second outlet, and the fifth switch is disposed between the second mixer and the water source.

6. The nuclear power plant defoaming device as described in claim 5, characterized in that, The second mixer is a mixed-flow injector, which includes a nozzle, a suction chamber, a mixing chamber and a diffuser connected in sequence, and the fourth switch and the fifth switch are connected in parallel to the nozzle.

7. The nuclear power plant defoaming device as described in claim 5, characterized in that, The first water outlet and the second water outlet are located at the bottom of the mixing tank, and the first pipeline and the second pipeline are located below the mixing tank.

8. The nuclear power plant defoaming device as described in claim 5, characterized in that, The nuclear power plant defoaming device also includes a fixed base, and the mixing tank, the first pipeline, and the second pipeline are all fixed on the fixed base.

9. The nuclear power plant defoaming device according to any one of claims 1 to 8, characterized in that, The water inlet is located at the bottom or top of the mixing tank, and the dosing port is located at the top of the mixing tank.

10. The nuclear power plant defoaming device according to any one of claims 1 to 8, characterized in that, The nuclear power plant defoaming device also includes a seventh switch, which is located between the water source and the water inlet, and the seventh switch is a manual switch.

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