A dynamic water device simulating the high temperature and high pressure of a nuclear power plant and its control method

Abstract

This application discloses a dynamic water device and its control method for simulating the high temperature and high pressure of a nuclear power plant, including a water storage tank, an aeration assembly, a circulation pump, a first branch, a second branch, and an ion control assembly. The water storage tank is used to hold experimental water; the aeration assembly is used to supply gas to the water storage tank; the circulation pump is used to output the aqueous solution from the water storage tank to the first and second branches to form a water circulation; both the first and second branches are equipped with ion control assemblies, which are used to control the concentration of various ions in the aqueous solution to more closely resemble the conditions of the aqueous solution during actual operation. This application uses the first branch to heat and pressurize the aqueous solution to simulate a real high temperature and high pressure environment, and uses the second branch to detect dissolved oxygen, pH, and conductivity of the aqueous solution; both the first and second branches are equipped with ion control assemblies, which can absorb various impurity ions in the aqueous solution and retain and release OH-. ‑ By regulating OH ‑ The concentration is used to adjust the pH of the aqueous solution.

Description

Technical Field

[0001] This application relates to the field of nuclear power plant simulation equipment technology, and in particular to a dynamic water device and its control method for simulating the high temperature and high pressure of a nuclear power plant. Background Technology

[0002] The secondary loop system of a nuclear power plant is a system for condensing and circulating the plant's water. It consists of equipment such as steam turbine generator sets, condensers, condensate pumps, feedwater heaters, deaerators, feedwater pumps, the secondary side of the steam generator, and steam-water separator reheaters. Because the secondary loop system involves water recycling, and the water used in nuclear power plants often contains various acidic ions, long-term operation can easily lead to corrosion of equipment or deposition on the heat transfer tubes of the steam generator. This not only disrupts the stability of the power plant's output power but also reduces the service life of the steam generator. Currently, most nuclear power units in China use fully volatile water treatment, injecting ammonia and hydrazine into the secondary loop system to maintain a relatively high pH value and reducing properties of the solution, while controlling the dissolved oxygen content in the loop and inhibiting corrosion of structural materials.

[0003] In laboratory simulations, to simulate the actual working environment of a nuclear power plant as closely as possible, it is necessary to control the temperature, pressure, and various ions in the aqueous solution. However, in practice, it was found that when dissolved oxygen is introduced, a small amount of CO2 is introduced, which forms carbonic acid upon entering the system. This causes instability in the system's pH value, especially in weakly alkaline environments, where it fluctuates drastically, causing the system's water chemical parameters to deviate from the set values.

[0004] Meanwhile, during the operation of a nuclear power plant, degradation of insulators and sealing materials, as well as coolant leaks, can lead to the presence of Cl in the system. - The cumulative effect. Therefore, Cl also needs to be added when simulating the water chemical environment system of a nuclear power plant in the laboratory. - And control its content. However, the probe that detects pH will continuously release Cl. - This leads to Cl in the system - The cumulative deviation from the set value continues, sometimes exceeding the set value by several orders of magnitude. Summary of the Invention

[0005] The purpose of this application is to at least solve one of the technical problems existing in the prior art, and to provide a dynamic water device and its control method for simulating the high temperature and high pressure of a nuclear power plant, capable of controlling dissolved oxygen, pH, conductivity, and Cl in the system. - The concentration was used to study the corrosion of secondary loop materials in nuclear power plants under conditions that more closely resemble actual service environments.

[0006] According to a first aspect of this application, a dynamic water device simulating the high temperature and high pressure of a nuclear power plant is provided, comprising:

[0007] Water storage tank;

[0008] An inflation assembly, comprising a mixed gas cylinder and a nitrogen cylinder, both of which are connected to the water storage tank for filling the water storage tank with gas to adjust the dissolved oxygen concentration;

[0009] A circulating pump has an inlet and two outlets that are interconnected. The inlet is connected to the water storage tank, and the two outlets are respectively connected to the first branch and the second branch.

[0010] The first branch includes a high-pressure pump, a preheater, a high-pressure vessel, a condenser, a back pressure valve, and an ion control assembly connected in sequence, wherein the high-pressure pump is connected to the circulation pump;

[0011] The second branch includes a first flow cell, a second flow cell, a third flow cell, and an ion control component connected in sequence. A dissolved oxygen probe is installed in the first flow cell, a pH probe is installed in the second flow cell, and a conductivity probe is installed in the third flow cell. The first flow cell is connected to the circulation pump.

[0012] The ion control component includes a third branch and a fourth branch connected in parallel. The third branch includes a mixed-type ion exchange resin and a first direct valve connected in sequence. The mixed-type ion exchange resin is used to absorb ions in the aqueous solution to make the aqueous solution neutral pure water. The fourth branch includes an OH-type anion exchange resin and a second direct valve connected in sequence. The OH-type anion exchange resin is used to absorb ions in the aqueous solution except for OH- ions. - Other anions and release OH- - .

[0013] According to a first aspect embodiment of this application, the first branch further includes C1 - Adjustment component, the Cl - The regulating components include interconnected high-pressure constant flow pumps and Cl - The injection bottle, the high-pressure constant flow pump, delivers the Cl... - Cl in the injection bottle - Input to the preheater.

[0014] According to the first aspect of the embodiment of this application, further, the Cl - The injection bottle was replaced with Zn. 2+ The injection bottle, the high-pressure constant flow pump, delivers the Zn... 2+ Zn in the injection bottle 2+The input is fed into the preheater; in the ion regulation component of the first branch, the fourth branch further includes a cation exchange resin, which is connected to the OH-type anion exchange resin for absorbing Zn in the aqueous solution. 2+ .

[0015] According to a first aspect of the present application, the first branch further includes a heat exchanger connected to the preheater, wherein the aqueous solution first undergoes heat exchange in the heat exchanger and then undergoes further heating in the heat exchanger.

[0016] According to a first aspect of the present application, the first branch further includes a chiller connected to the condenser for supplying condensate to the condenser.

[0017] According to a first aspect of the present application, the second branch further includes a third straight valve and a bypass branch. The third straight valve is disposed between the first flow pool and the water storage tank. One end of the bypass branch is disposed between the third straight valve and the water storage tank, and the other end of the bypass branch is disposed between the ion control component of the second branch and the water storage tank. A fourth straight valve is disposed on the bypass branch.

[0018] According to a first aspect embodiment of this application, further, in the ion control component, the third branch further includes a first flow meter connected to the first straight valve; the fourth branch further includes a second flow meter connected to the second straight valve.

[0019] According to a first aspect embodiment of this application, further, in the ion control component, the third branch and the fourth branch converge into an output pipeline, and a third flow meter is installed on the output pipeline.

[0020] According to a second aspect of this application, a control method for a dynamic water device under simulated high temperature and high pressure conditions in a nuclear power plant is proposed, comprising:

[0021] Water is injected into the water storage tank, and the mixed gas cylinder and / or nitrogen cylinder are opened; when the oxygen content in the water storage tank is high, the nitrogen cylinder is opened to introduce nitrogen to remove oxygen; when the oxygen content in the water storage tank is low, the mixed gas cylinder is opened to introduce mixed gas to introduce oxygen.

[0022] When the circulation pump is turned on, the aqueous solution in the water storage tank flows into the first branch and the second branch respectively.

[0023] The aqueous solution flowing into the first branch sequentially enters the high-pressure pump to increase the water pressure, enters the heat exchanger and preheater to increase the temperature, enters the autoclave to maintain a high temperature and high pressure state, enters the condenser to cool down the high temperature water, and enters the back pressure valve to precisely control the output water pressure.

[0024] The aqueous solution enters the ion control component of the first branch, where the mixed-type ion exchange resin absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin absorbs ions from the aqueous solution to remove OH-. - Other anions and release OH- - The neutral pure water and the OH-containing solution are adjusted by regulating the opening of the first and second straight valves. - The proportion of the aqueous solution;

[0025] The aqueous solution flowing into the second branch sequentially enters the first flow cell to detect the dissolved oxygen concentration of the aqueous solution, enters the second flow cell to detect the pH value of the aqueous solution, and enters the third flow cell to detect the conductivity of the aqueous solution.

[0026] The aqueous solution enters the ion control component of the second branch, where the mixed-type ion exchange resin absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin absorbs anions from the aqueous solution and retains OH-. - The neutral pure water and the OH-containing solution are adjusted by regulating the opening of the first and second straight valves. - The proportion of the aqueous solution;

[0027] The above operation is repeated cyclically to ensure that the aqueous solution in the water storage tank has stable dissolved oxygen, pH, conductivity, and Cl-. - concentration.

[0028] The beneficial effects of this application's embodiments include at least the following: this application heats and pressurizes the aqueous solution through a first branch to simulate a real high-temperature and high-pressure environment, and detects dissolved oxygen, pH, and conductivity of the aqueous solution through a second branch; both the first and second branches are equipped with ion control components, which can absorb various impurity ions in the aqueous solution and retain and release OH- ions. - By regulating OH - The concentration is used to adjust the pH of the aqueous solution. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this application, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0030] Figure 1 This is a layout diagram of a dynamic water device simulating a high-temperature and high-pressure nuclear power plant, according to the first aspect of this application.

[0031] Figure 2 This is a connection diagram of a dynamic water device simulating a high-temperature and high-pressure nuclear power plant according to the first aspect of this application;

[0032] Figure 3 This is a schematic diagram of the connection of the ion control component 600 in the dynamic water device simulating the high temperature and high pressure of a nuclear power plant, according to the first aspect of this application.

[0033] Figure reference numerals: 100-Water storage tank, 200-Inflation assembly, 210-Mixed gas cylinder, 220-Nitrogen cylinder, 300-Circulating pump, 400-First branch, 410-High-pressure pump, 420-Preheater, 430-High-pressure vessel, 440-Condenser, 450-Back pressure valve, 460-Cl - Adjustment components, 461-high pressure constant flow pump, 462-Cl - Injection bottle, 470-Heat exchanger, 480-Chiller, 490-Buffer tank, 500-Second branch, 510-First flow cell, 511-Dissolved oxygen probe, 520-Second flow cell, 521-pH probe, 530-Third flow cell, 531-Conductivity probe, 540-Third straight valve, 550-Bypass branch, 551-Fourth straight valve, 600-Ion control component, 610-Third branch, 611-Mixed ion exchange resin, 612-First straight valve, 613-First flow meter, 620-Fourth branch, 621-OH type anion exchange resin, 622-Second straight valve, 623-Second flow meter, 630-Third flow meter. Detailed Implementation

[0034] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0035] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0036] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0038] In simulation experiments of the secondary loop system of a nuclear power plant, in order to simulate the actual working environment of the nuclear power plant as closely as possible, it is necessary to control the temperature, pressure, and various ions in the aqueous solution. However, in actual operation, it was found that when dissolved oxygen is introduced, a small amount of CO2 is introduced, which forms carbonic acid after entering the system. This causes the pH value of the system to be unstable, especially in a weakly alkaline environment, where it fluctuates drastically, causing the water chemical parameters in the system to deviate from the set values.

[0039] Meanwhile, during the operation of a nuclear power plant, degradation of insulators and sealing materials, as well as coolant leaks, can lead to the presence of Cl in the system. - The cumulative effect. Therefore, Cl also needs to be added when simulating the water chemical environment system of a nuclear power plant in the laboratory. - And control its content. However, the probe that detects pH will continuously release Cl. - This leads to Cl in the system - The cumulative deviation from the set value continues, sometimes exceeding the set value by several orders of magnitude.

[0040] To address this issue, this application proposes a dynamic water device and its control method that simulates the high temperature and high pressure of a nuclear power plant. The device heats and pressurizes the aqueous solution via a first branch 400 to simulate a real high temperature and high pressure environment, while a second branch 500 detects dissolved oxygen, pH, and conductivity of the aqueous solution. Both the first branch 400 and the second branch 500 are equipped with ion control components 600, capable of absorbing various impurity ions in the aqueous solution and retaining OH- ions. - By regulating OH - The concentration is used to adjust the pH of the aqueous solution.

[0041] Reference Figure 1The dynamic water device simulating the high temperature and high pressure of a nuclear power plant in the first aspect of this application includes a water storage tank 100, an aeration component 200, a circulation pump 300, a first branch 400, a second branch 500, and an ion control component 600. The water storage tank 100 is used to hold experimental water; the aeration component 200 is used to supply gas to the water storage tank 100 and adjust the dissolved oxygen concentration; the circulation pump 300 is used to output the aqueous solution in the water storage tank 100 to the first branch 400 and the second branch 500 to form a water circulation; and the first branch 400 and the second branch 500 are both equipped with ion control components 600, which are used to control the concentration of various ions in the aqueous solution to more closely resemble the conditions of the aqueous solution during actual operation.

[0042] Specifically, refer to Figure 2 The inflation assembly 200 includes a mixing gas cylinder 210 and a nitrogen cylinder 220, both of which are connected to the water storage tank 100 and their opening is controlled by corresponding gas valves, thereby controlling the volume of gas added. When the oxygen content in the water storage tank 100 is high, the nitrogen cylinder 220 is opened to introduce nitrogen to remove oxygen; when the oxygen content in the water storage tank 100 is low, the mixing gas cylinder 210 is opened to introduce a mixed gas to introduce oxygen.

[0043] The circulating pump 300 has one inlet and two outlets that are interconnected. The inlet is connected to the water storage tank 100, and the two outlets are connected to the first branch 400 and the second branch 500, respectively.

[0044] The first branch 400 is a high-temperature, high-pressure branch used to raise the temperature and pressure of the aqueous solution to achieve a state similar to that of a real working environment. The first branch 400 includes, in sequence, a high-pressure pump 410, a preheater 420, an autoclave 430, a condenser 440, a back-pressure valve 450, and an ion control component 600. The high-pressure pump 410 is connected to the circulation pump 300. After entering the first branch 400, the aqueous solution undergoes sequential pressure raising by the high-pressure pump 410, temperature raising by the preheater 420, pressure stabilization by the autoclave 430, condensation of high-temperature steam by the condenser 440, and water pressure adjustment by the back-pressure valve 450 before being output to the ion control component 600. The ion control component 600 then adjusts the specific concentrations of various ions in the aqueous solution.

[0045] The second branch 500 is a detection branch used to detect dissolved oxygen, pH, and conductivity of the aqueous solution. Since various probes are difficult to operate under high temperature and pressure, they are not included in the first branch 400. The second branch 500 includes a first flow cell 510, a second flow cell 520, a third flow cell 530, and an ion control component 600 connected in sequence. A dissolved oxygen probe 511 is installed in the first flow cell 510, a pH probe 521 is installed in the second flow cell 520, and a conductivity probe 531 is installed in the third flow cell 530. The first flow cell 510 is connected to a circulation pump 300. After the aqueous solution enters the second branch 500, the dissolved oxygen concentration is detected in the first flow cell 510, the pH value is detected in the second flow cell 520, and the conductivity is detected in the third flow cell 530. Because the probes may cause some ions in the aqueous solution (such as Cl-) to be detected, the second branch 500 is not included in the first branch 400. - As the concentration increases, the aqueous solution needs to be introduced into the ion control component 600 for further control of the ion concentration.

[0046] For the ion control component 600, refer to Figure 3 The ion regulation component 600 includes a third branch 610 and a fourth branch 620 connected in parallel. The third branch 610 includes a mixed-type ion exchange resin 611 and a first direct valve 612 connected in sequence. The mixed-type ion exchange resin 611 is used to absorb ions in the aqueous solution to make the aqueous solution neutral pure water. The fourth branch 620 includes an OH-type anion exchange resin 621 and a second direct valve 622 connected in sequence. The OH-type anion exchange resin 621 is used to absorb ions in the aqueous solution except for OH-. - Other anions and release OH- - By adjusting the opening degree of the first straight valve 612 and the second straight valve 622, the neutral pure water and OH- ions output to the water storage tank 100 can be adjusted. - The proportion of aqueous solution can be adjusted to precisely control the pH value of the solution, thereby improving the simulation and accuracy of the experiment.

[0047] Furthermore, the first branch road 400 also includes Cl - Adjustment component 460, Cl - The regulating assembly 460 includes a high-pressure constant flow pump 461 and a Cl connected to each other. - Injection bottle 462, high-pressure constant flow pump 461 delivers Cl... - Cl in injection bottle 462 - The input is fed to heat exchanger 470, thereby creating a Cl between high-pressure pump 410 and back pressure valve 450. - This simulates actual working conditions. Based on the flow rate of the flow meter 630 in the ion control component 600 of the first branch 400, the flow rate of the high-pressure constant flow pump 461 can be set to match the Cl flow rate. - Cl in injection bottle 462- The concentration of Cl is precisely controlled and output to the water storage tank 100. - concentration.

[0048] Furthermore, the first branch can also meet the Zn requirements of the corresponding experimental conditions under the simulated primary-loop zinc injection technology. 2+ Concentration precision control. Cl... - The injection bottle 462 was replaced with Zn. 2+ The injection bottle and high-pressure constant flow pump 461 deliver Zn... 2+ Zn in the injection bottle 2+ The input is fed into the preheater 420; in the ion regulation component 600 of the first branch 400, the fourth branch 620 also includes a cation exchange resin, which is connected to an OH-type anion exchange resin 621 for absorbing Zn in the aqueous solution. 2+ .

[0049] Furthermore, the first branch 400 also includes a heat exchanger 470, which is connected to the preheater 420. The aqueous solution first undergoes heat exchange in the heat exchanger 470 and then undergoes further heating in the preheater 420.

[0050] Furthermore, the first branch 400 also includes a chiller 480, which is connected to the condenser 440 and is used to supply condensate to the condenser 440.

[0051] Furthermore, the second branch 500 also includes a third direct valve 540 and a bypass branch 550. The third direct valve 540 is located between the first flow cell 510 and the water storage tank 100. One end of the bypass branch 550 is located between the third direct valve 540 and the water storage tank 100, and the other end of the bypass branch 550 is located between the ion control component 600 of the second branch 500 and the water storage tank 100. A fourth direct valve 551 is also provided on the bypass branch 550. When online maintenance of the probes on the second branch 500 is required, the fourth direct valve 551 can be opened while the third direct valve 540 is closed, allowing the water flowing out of the water storage tank 100 to flow back through the bypass branch 550. At this time, no aqueous solution flows into the flow cells, allowing for probe maintenance and repair.

[0052] Furthermore, in the ion control component 600, the third branch 610 further includes a first flow meter 613 connected to a first straight valve 612; the fourth branch 620 further includes a second flow meter 623 connected to a second straight valve 622. The flow rates of the third branch 610 and the fourth branch 620 can be detected by the first flow meter 613 and the second flow meter 623, thereby precisely controlling the opening degree of the first straight valve 612 and the second straight valve 622, resulting in higher accuracy in ion concentration regulation.

[0053] Furthermore, in the ion control component 600, the third branch 610 and the fourth branch 620 converge into an output pipeline, and a third flow meter 630 is installed on the output pipeline, which can detect the total flow rate flowing out of the ion control component 600.

[0054] A control method for a dynamic water device under high temperature and high pressure in a simulated nuclear power plant, according to a second aspect of this application, includes the following steps:

[0055] S100. Fill the water tank 100 with water and open the mixing gas cylinder 210 and / or the nitrogen cylinder 220; when the oxygen content in the water tank 100 is high, open the nitrogen cylinder 220 to introduce nitrogen to remove oxygen; when the oxygen content in the water tank 100 is low, open the mixing gas cylinder 210 to introduce mixed gas to introduce oxygen.

[0056] S200. Start the circulation pump 300, and the aqueous solution in the water storage tank 100 flows into the first branch 400 and the second branch 500 respectively;

[0057] S310. The aqueous solution flowing into the first branch 400 sequentially enters the high-pressure pump 410 to increase the water pressure, enters the heat exchanger 470 and the preheater 420 to increase the temperature, enters the autoclave 430 to maintain the high pressure, enters the condenser 440 to cool and condense the steam, and enters the back pressure valve 450 to precisely control the output water pressure.

[0058] S320. The aqueous solution enters the ion control component 600 of the first branch 400. The mixed-type ion exchange resin 611 absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin 621 absorbs OH- ions from the aqueous solution. - Other anions and release OH- - The neutral pure water and the OH-containing solution are adjusted by regulating the opening of the first straight valve 612 and the second straight valve 622. - The proportion of the aqueous solution;

[0059] S410. The aqueous solution flowing into the second branch 500 sequentially enters the first flow cell 510 to detect the dissolved oxygen concentration of the aqueous solution, enters the second flow cell 520 to detect the pH value of the aqueous solution, and enters the third flow cell 530 to detect the conductivity of the aqueous solution.

[0060] S420. The aqueous solution enters the ion control component 600 of the second branch 500. The mixed-type ion exchange resin 611 absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin 621 absorbs OH- ions from the aqueous solution. - Other anions and release OH- - The neutral pure water and the OH-containing solution are adjusted by regulating the opening of the first straight valve 612 and the second straight valve 622.- The proportion of the aqueous solution;

[0061] S500. Repeat the above operation to ensure that the aqueous solution in the water storage tank 100 has stable dissolved oxygen, pH, conductivity, and Cl-. - concentration.

[0062] The above is a detailed description of the preferred embodiments of this application. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A dynamic water device simulating the high temperature and high pressure of a nuclear power plant, characterized in that, include: Water storage tank (100); An inflation assembly (200) includes a mixed gas cylinder (210) and a nitrogen cylinder (220), both of which are connected to the water storage tank (100) for filling the water storage tank (100) with gas to adjust the dissolved oxygen concentration. A circulating pump (300) has an inlet and two outlets that are interconnected. The inlet is connected to the water storage tank (100), and the two outlets are respectively connected to the first branch (400) and the second branch (500). The first branch (400) includes a high-pressure pump (410), a preheater (420), a high-pressure vessel (430), a condenser (440), a back pressure valve (450), and a first ion control assembly connected in sequence. The high-pressure pump (410) is connected to the circulating pump (300). The second branch (500) includes a first flow cell (510), a second flow cell (520), a third flow cell (530), and a second ion control component connected in sequence. A dissolved oxygen probe (511) is installed in the first flow cell (510), a pH probe (521) is installed in the second flow cell (520), and a conductivity probe (531) is installed in the third flow cell (530). The first flow cell (510) is connected to the circulation pump (300). The ion control component includes a third branch (610) and a fourth branch (620) connected in parallel. The third branch (610) includes a mixed-type ion exchange resin (611) and a first direct valve (612) connected in sequence. The mixed-type ion exchange resin (611) is used to absorb ions in the aqueous solution to make the aqueous solution neutral pure water. The fourth branch (620) includes an OH-type anion exchange resin (621) and a second direct valve (622) connected in sequence. The OH-type anion exchange resin (621) is used to absorb ions in the aqueous solution except for OH-. - Other anions and release OH- - ; The second branch (500) further includes a third straight valve (540) and a bypass branch (550). The third straight valve (540) is disposed between the first flow pool (510) and the water storage tank (100). One end of the bypass branch (550) is disposed between the third straight valve (540) and the water storage tank (100), and the other end of the bypass branch (550) is disposed between the second ion control component of the second branch (500) and the water storage tank (100). A fourth straight valve (551) is disposed on the bypass branch (550).

2. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 1, characterized in that: The first branch (400) also includes Cl - Adjustment component (460), the Cl - The regulating assembly (460) includes an interconnected high-pressure constant flow pump (461) and Cl - The injection bottle (462), the high-pressure constant flow pump (461) delivers the Cl... - Cl in injection bottle (462) - Input to the preheater (420).

3. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 2, characterized in that: The Cl - The injection bottle (462) was replaced with Zn. 2+ The injection bottle, the high-pressure constant flow pump (461) delivers the Zn 2+ Zn in the injection bottle 2+ The input is sent to the preheater (420); in the first ion control component of the first branch (400), the fourth branch (620) further includes a cation exchange resin, which is connected to the OH-type anion exchange resin (621) for absorbing Zn in the aqueous solution. 2+ .

4. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 1, characterized in that: The first branch (400) also includes a heat exchanger (470), which is connected to the preheater (420). The aqueous solution first undergoes heat exchange in the heat exchanger (470) and then undergoes further heating in the preheater (420).

5. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 1, characterized in that: The first branch (400) also includes a chiller (480), which is connected to the condenser (440) and is used to supply condensate to the condenser (440).

6. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 1, characterized in that: In the ion control assembly, the third branch (610) further includes a first flow meter (613), which is connected to the first straight valve (612); the fourth branch (620) further includes a second flow meter (623), which is connected to the second straight valve (622).

7. The dynamic water device simulating high temperature and high pressure in a nuclear power plant according to claim 1, characterized in that: In the ion control component, the third branch (610) and the fourth branch (620) converge into an output pipe, and a third flow meter (630) is installed on the output pipe.

8. A control method for a dynamic water device simulating a high-temperature and high-pressure nuclear power plant as described in any one of claims 1 to 7, characterized in that, include: Water is injected into the water storage tank (100), and the mixing gas cylinder (210) and / or nitrogen cylinder (220) are opened; when the oxygen content in the water storage tank (100) is high, the nitrogen cylinder (220) is opened to introduce nitrogen to remove oxygen; when the oxygen content in the water storage tank (100) is low, the mixing gas cylinder (210) is opened to introduce mixed gas to introduce oxygen. When the circulation pump (300) is turned on, the aqueous solution in the water storage tank (100) flows into the first branch (400) and the second branch (500) respectively. The aqueous solution flowing into the first branch (400) sequentially enters the high-pressure pump (410) to increase the water pressure, enters the preheater (420) to increase the temperature, enters the autoclave (430) to maintain the high temperature and high pressure state, enters the condenser (440) to cool down the high temperature water, and enters the back pressure valve (450) to precisely control the output water pressure. The aqueous solution enters the first ion control component of the first branch (400), where the mixed-type ion exchange resin (611) absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin (621) absorbs ions from the aqueous solution except for OH-. - Other anions and release OH- - The neutral pure water and the mixture containing OH groups are adjusted by regulating the opening of the first straight valve (612) and the second straight valve (622). - The proportion of the aqueous solution; The aqueous solution flowing into the second branch (500) sequentially enters the first flow cell (510) to detect the dissolved oxygen concentration of the aqueous solution, enters the second flow cell (520) to detect the pH value of the aqueous solution, and enters the third flow cell (530) to detect the conductivity of the aqueous solution. The aqueous solution enters the second ion control component of the second branch (500), where the mixed-type ion exchange resin (611) absorbs ions from the aqueous solution to produce neutral pure water, and the OH-type anion exchange resin (621) absorbs anions from the aqueous solution and retains OH-. - The neutral pure water and the mixture containing OH groups are adjusted by regulating the opening of the first straight valve (612) and the second straight valve (622). - The proportion of the aqueous solution; The above operation is repeated cyclically to ensure that the aqueous solution in the water storage tank (100) has stable dissolved oxygen, pH, conductivity, and Cl- content. - concentration.

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