A desalting device for secondary circuit make-up water of small and medium-sized nuclear power plants

Abstract

The utility model relates to nuclear power device technical field provides a kind of medium and small nuclear power plant secondary loop make-up water's desalting device, including hydrate raw material input end, with the communication of hydrate raw material input end hydrate generation decomposition component, with the communication of hydrate generation decomposition component product output end;Hydrate raw material input end includes CO2 gas station, cyclopentane container;Hydrate generation decomposition component includes with the communication of hydrate raw material input end hydrate generation reactor, with the communication of hydrate generation reactor's output end separator, with the communication of separator hydrate decomposition reactor;The input end of hydrate generation reactor is connected with feed water container;The first port input of hydrate decomposition reactor has heat medium import, and the second port output of hydrate decomposition reactor has heat medium export;Heat medium comes from the steam waste heat of nuclear power plant secondary loop.The desalting device provided by the utility model is for the demand of medium and small nuclear power plant secondary loop make-up water of comprehensive energy supply, and the secondary loop make-up water is desalted using hydrate method, so as to reach the advantages of simple and efficient, low energy consumption.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power plant technology, and more specifically, to a desalination device for the secondary loop makeup water of a small to medium-sized nuclear power plant. Background Technology

[0002] Currently, the main desalination methods widely used in the secondary loop of commercial nuclear power plants are multi-stage flash evaporation, multi-effect distillation, and reverse osmosis membrane methods. In practical applications, the specific desalination method is determined based on factors such as system output, unit capacity, equipment price, and site conditions. These desalination methods also face problems such as low separation efficiency and high energy consumption. Compared to commercial nuclear power plants, the scale of desalination water supply for the secondary loop of small and medium-sized nuclear power plants used for integrated energy supply is smaller. If traditional, inefficient, and high-energy desalination methods are still used, it will seriously affect the overall economic efficiency of the plant. Utility Model Content

[0003] This utility model provides a desalination device for the secondary loop makeup water of small and medium-sized nuclear power plants, which solves the problems of low separation efficiency and high energy consumption in existing makeup water desalination methods.

[0004] The specific implementation plan is as follows: A desalination device for secondary loop makeup water in a small to medium-sized nuclear power plant includes... Hydrate feedstock input end, hydrate generation and decomposition component connected to the hydrate feedstock input end, and product output end connected to the hydrate generation and decomposition component; The hydrate feedstock input includes a CO2 gas station and a cyclopentane container; The hydrate generation and decomposition assembly includes a hydrate generation reactor connected to the hydrate feedstock input end, a separator connected to the output end of the hydrate generation reactor, and a hydrate decomposition reactor connected to the separator. The input end of the hydrate generation reactor is connected to a water supply container; The first port of the hydrate decomposition reactor has a heat medium inlet, and the second port of the hydrate decomposition reactor has a heat medium outlet; the heat medium comes from the waste heat of steam in the secondary loop of the nuclear power plant.

[0005] According to some preferred embodiments, a booster pump is provided in the transport line between the CO2 gas station and the hydrate generation and decomposition component.

[0006] According to some preferred embodiments, a first delivery pump is provided in the transport line between the cyclopentane container and the hydrate formation and decomposition component.

[0007] According to some preferred embodiments, a second delivery pump is provided in the transport route between the water supply container and the hydrate generation reactor.

[0008] According to some preferred embodiments, the hydrate generation reactor is connected to a cooler.

[0009] According to some preferred embodiments, the separator is a cyclone separator.

[0010] According to some preferred embodiments, the output of the separator is connected to a brine collection container.

[0011] According to some preferred embodiments, the product output end includes a separator, and a first output end and a second output end respectively connected to the separator. The first output end is connected to the cyclopentane container at the hydrate feedstock input end, and the second output end is connected to the secondary loop makeup water system and the water supply container respectively.

[0012] According to some preferred embodiments, the second output end of the conveying line is provided with a detection unit and a branch pipeline in sequence. The branch pipeline is equipped with a solenoid valve and is connected to the secondary circuit water supply system and the water supply container respectively.

[0013] According to some preferred embodiments, the detection unit is equipped with a conductivity meter.

[0014] The technical solution of this utility model embodiment has at least the following advantages and beneficial effects: (1) The desalination device provided by this utility model is designed for the needs of the secondary loop makeup water of small and medium-sized nuclear power plants with integrated energy supply. It uses the hydrate method to desalinate the secondary loop makeup water, thereby achieving the advantages of simplicity, high efficiency and low energy consumption.

[0015] (2) The desalination device provided by this utility model uses the process heat of the nuclear power plant to pyrolyze the generated solid hydrate, making full use of the heat source of the nuclear power plant, thereby achieving the purpose of making full use of the heat source. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a desalination device for the secondary loop makeup water of a small-to-medium-sized nuclear power plant, provided as an example.

[0018] Figure reference numerals: 1-CO2 gas station, 2-cyclopentane container, 3-boost pump, 4-first transfer pump, 5-hydrate generation reactor, 6-separator, 7-hydrate decomposition reactor, 8-water supply container, 9-second transfer pump, 10-cooler, 11-brine collection container, 12-separator, 13-detection unit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be noted that if terms such as "middle," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they 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, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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.

[0023] Example 1 like Figure 1 As shown, this utility model provides a desalination device for the secondary loop makeup water of a small to medium-sized nuclear power plant, including... Hydrate feedstock input end, hydrate generation and decomposition component connected to the hydrate feedstock input end, and product output end connected to the hydrate generation and decomposition component.

[0024] The hydrate feedstock input includes a CO2 gas station 1 and a cyclopentane container 2. A booster pump 3 is installed in the conveying line between the CO2 gas station 1 and the hydrate formation and decomposition assembly. A first conveying pump 4 (cyclopentane pump) is installed in the conveying line between the cyclopentane container 2 and the hydrate formation and decomposition assembly.

[0025] The hydrate generation and decomposition assembly includes a hydrate generation reactor 5 connected to the hydrate raw material input end, a separator 6 connected to the output end of the hydrate generation reactor 5, and a hydrate decomposition reactor 7 connected to the separator 6.

[0026] The input end of the hydrate generation reactor 5 is connected to a feedwater container 8, and a second transfer pump 9 (feedwater pump) is installed along the transport route between the feedwater container 8 and the hydrate generation reactor 5. As mentioned above, the water source in the feedwater container 8 can come from a pool within the power plant or be introduced from seawater.

[0027] The hydrate formation reactor 5 is connected to a cooler 10. Specifically, the cooler 10 is a refrigerator used to meet the reaction temperature required for hydrate formation.

[0028] The hydrate generation reactor 5 and the hydrate decomposition reactor 7 can be existing hydrate reactors. The hydrate generation reactor 5 is a pressure-resistant reactor, and the hydrate reactor 7 is an atmospheric pressure reactor. The atmospheric pressure reactor can be a jacketed reactor.

[0029] Separator 6 is specifically selected as a hydrocyclone separator, which facilitates the separation of solid hydrates and liquids.

[0030] The output of separator 6 is connected to brine collection container 11.

[0031] The first port of the hydrate decomposition reactor 7 has a heat transfer medium inlet, and the second port of the hydrate decomposition reactor 7 has a heat transfer medium outlet. The aforementioned heat transfer medium comes from the waste heat of the secondary loop of the nuclear power plant. The waste heat of the secondary loop steam comes from the low-pressure, low-temperature steam after the main steam drives the turbine and is discharged through the condenser. The temperature is about 30~60℃, which is sufficient for the decomposition of solid hydrates.

[0032] The product output end includes a separator 12, and a first output end and a second output end connected to the separator 12. The first output end is connected to the cyclopentane container 2 at the hydrate feedstock input end, and the second output end is connected to the secondary loop makeup water system and the feedwater container 8. The separator 12 is a gravity separator.

[0033] The second output end's delivery line is sequentially equipped with a detection unit 13 and branch lines. The branch lines are equipped with solenoid valves and are connected to the secondary loop makeup water system and the water supply container 8, respectively. The detection unit 13 is equipped with a conductivity meter to detect the total concentration of dissolved ions in the demineralized water. If the secondary loop makeup water requirement is met, the demineralized water is delivered to the secondary loop makeup water system; if the requirement is not met, the demineralized water is delivered to the water supply container 8, or further processed through ion exchange resin to remove anions and cations from the demineralized water. After conductivity measurement to ensure the makeup water requirement is met, it is then delivered to the secondary loop makeup water system.

[0034] A contact conductivity sensor can be specifically selected for the conductivity meter to continuously measure the conductivity of demineralized water. Regular calibration is important during use.

[0035] The aforementioned booster pump 3, first delivery pump 4, second delivery pump 9, electric valve, conductivity meter, etc., can all be automatically controlled using existing PLC programs.

[0036] The working process of the desalination device for secondary loop makeup water in small and medium-sized nuclear power plants provided by this utility model is as follows: CO2 from CO2 gas station 1 and cyclopentane from cyclopentane container 2 are respectively fed into hydrate generation reactor 5, and water from feedwater container 8 is fed into hydrate generation reactor 5. The temperature of hydrate generation reactor 5 is maintained at approximately 2-4°C under the control of a chiller. Hydrate is generated by the stirring action of a stirring device installed in hydrate generation reactor 5. The hydrate enters a hydrocyclone separator, where the solid hydrate is transported to hydrate decomposition reactor 7, and the brine is transported to brine collection container 11. In hydrate decomposition reactor 7, the solid hydrate is decomposed by heat under the action of a heat medium to obtain CO2, cyclopentane, and demineralized water. CO2 is transported to CO2 gas station 1 via a pipeline. Cyclopentane and demineralized water are separated by a gravity separator. Cyclopentane is transported to cyclopentane container 2 via a pipeline, and demineralized water is transported to the secondary loop makeup water system or reused in feedwater container 8 via a pipeline.

[0037] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A desalination device for the secondary loop makeup water of a small to medium-sized nuclear power plant, characterized in that: include Hydrate feedstock input end, hydrate generation and decomposition component connected to the hydrate feedstock input end, and product output end connected to the hydrate generation and decomposition component; The hydrate feedstock input includes a CO2 gas station and a cyclopentane container; The hydrate generation and decomposition assembly includes a hydrate generation reactor connected to the hydrate feedstock input end, a separator connected to the output end of the hydrate generation reactor, and a hydrate decomposition reactor connected to the separator. The input end of the hydrate generation reactor is connected to a water supply container; The first port of the hydrate decomposition reactor has a heat medium inlet, and the second port of the hydrate decomposition reactor has a heat medium outlet; the heat medium comes from the waste heat of steam in the secondary loop of the nuclear power plant.

2. The desalination device for secondary loop makeup water in small and medium-sized nuclear power plants according to claim 1, characterized in that: A booster pump is installed on the conveying line between the CO2 gas station and the hydrate generation and decomposition component.

3. The desalination device for secondary loop makeup water in small and medium-sized nuclear power plants according to claim 1, characterized in that: A first transfer pump is installed in the transport line between the cyclopentane container and the hydrate formation and decomposition component.

4. The desalination device for the secondary loop makeup water of a small-to-medium-sized nuclear power plant according to claim 1, characterized in that: A second delivery pump is installed along the transport route between the water supply container and the hydrate generation reactor.

5. The desalination device for the secondary loop makeup water of a small-to-medium-sized nuclear power plant according to claim 1, characterized in that: The hydrate generation reactor is connected to a refrigeration unit.

6. The desalination device for secondary loop makeup water in small and medium-sized nuclear power plants according to claim 1, characterized in that: The separator is a cyclone separator.

7. The desalination device for secondary loop makeup water in small and medium-sized nuclear power plants according to claim 1, characterized in that: The output of the separator is connected to a brine collection container.

8. The desalination device for secondary loop makeup water in small and medium-sized nuclear power plants according to any one of claims 1 to 7, characterized in that: The product output end includes a separator, and a first output end and a second output end connected to the separator respectively. The first output end is connected to the cyclopentane container at the hydrate feedstock input end, and the second output end is connected to the secondary loop makeup water system and the feed water container respectively.

9. The desalination device for the secondary loop makeup water of a small-to-medium-sized nuclear power plant according to claim 8, characterized in that: The second output end's transmission line is equipped with a detection unit and branch lines in sequence. The branch lines are equipped with solenoid valves and are connected to the secondary circuit water supply system and the water supply container, respectively.

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