In-reactor water chemical environment material corrosion test system and test method thereof

Abstract

The invention provides an in-reactor water chemical environment material corrosion test system. The in-reactor water chemical environment material corrosion test system comprises a high-temperature environment system, a water quality adjusting system connected with the high-temperature environment system, and a leakage monitoring system connected with the high-temperature environment system. The invention also provides an in-reactor water chemical environment material corrosion test method. According to the in-reactor water chemical environment material corrosion test system and the test method thereof, the thermal power loss of the system is small, the flow resistance of a test section is low, the surface flow velocity of a sample is high, and the fault frequency of a leak detection system is low.

Description

Technical Field

[0001] The invention relates to the technical field of in-pile material corrosion testing, and in particular to an in-pile water chemical environment material corrosion testing system and a testing method thereof. Background Art

[0002] Reactor fuel cladding is the second barrier of nuclear fuel, and its performance is directly related to reactor safety. In order to study the behavior of cladding materials under their service conditions, especially their corrosion resistance, it is necessary to conduct in-core water chemical environment corrosion tests on cladding materials under conditions of high temperature and high pressure, neutron radiation and specific water quality.

[0003] However, the current in-pile water chemical environment material corrosion test system has problems such as complex system structure, large system thermal power loss, large flow resistance in the test section, low sample surface flow velocity, and high failure frequency of the leak detection system.

[0004] Therefore, there is an urgent need for an in-pile water chemical environment material corrosion test system and a test method thereof, which has low system thermal power loss, low test section flow resistance, high sample surface flow velocity, and low leakage detection system failure frequency. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an in-pile water chemical environment material corrosion test system and a test method thereof with low system thermal power loss, low test section flow resistance, high sample surface flow velocity, and low leakage detection system failure frequency.

[0006] In order to solve the above technical problems, the present invention provides an in-pile water chemical environment material corrosion test system, including a high temperature environment system, a water quality adjustment system connected to the high temperature environment system, and a leakage monitoring system connected to the high temperature environment system;

[0007] The high temperature environment system comprises an in-pile irradiation device, the outlet of the in-pile irradiation device is connected to the inlet pipeline of the first heating device, the outlet of the first heating device is connected to the inlet pipeline of the circulation drive device, the outlet of the circulation drive device is connected to the inlet pipeline of the second heating device, the outlet of the second heating device is connected to the inlet pipeline of the in-pile irradiation device, and a voltage regulator is connected in parallel between the first heating device and the second heating device;

[0008] The water quality regulation system comprises an integrated thermostat whose high temperature section inlet is connected to the circulation drive device outlet pipeline, the high temperature section outlet of the integrated thermostat is respectively connected to the sampling device and the ultrafine filtration membrane inlet pipeline, the ultrafine filtration membrane outlet is connected in parallel with multiple ion exchange column inlet pipelines, the ion exchange column outlet is connected to the water quality regulation box inlet pipeline through a pressure reducing valve, the water quality regulation box outlet is connected to the low temperature section inlet pipeline of the integrated thermostat through a water injection pump, and the low temperature section outlet of the integrated thermostat is connected to the circulation drive device inlet pipeline;

[0009] A liquid adding device and a gas adding device are arranged on the upper part of the water quality regulating box, a water quality regulating box heater is arranged on the bottom of the water quality regulating box, and a liquid level monitor, a pressure monitor, a temperature monitor, a pH value monitor, a dissolved oxygen concentration monitor, a dissolved hydrogen solubility monitor, a suspended matter concentration monitor, an impurity ion concentration monitor and a conductivity monitor are arranged on the side of the water quality regulating box;

[0010] The leakage monitoring system comprises a gas buffer tank connected to the in-pile irradiation device through an electric venting valve and a safety valve pipeline in sequence, a high-pressure inert gas bottle connected to the gas buffer tank through a second electric venting valve pipeline, and a vacuum pump connected to the in-pile irradiation device and the pipeline between the safety valve through an isolation valve;

[0011] A temperature monitor, a pressure monitor and a humidity monitor are arranged on the pipeline between the isolation valve and the in-pile irradiation device.

[0012] Furthermore, the circulation drive device includes a first circulation drive device and a second circulation drive device, the inlets of the first circulation drive device and the second circulation drive device are respectively connected to the outlet pipe of the first heating device, and the outlets of the first circulation drive device and the second circulation drive device are respectively connected to the inlet pipe of the second heating device.

[0013] Furthermore, the in-pile irradiation device adopts a low flow resistance in-pile test section design, the test section includes four guide rods and a plurality of test section modules arranged between the four guide rods and interconnected, the test section module includes an outer ring member, end members arranged at both ends of the outer ring member, and a center member arranged at the center of the outer ring member and connected to the end members at both ends, a plurality of test samples are arranged radially from the center in the same plane between the center member and the outer ring member, and both ends of each test sample are respectively connected to the center member and the outer ring member.

[0014] Furthermore, the end parts are of hollow design, the ribs of the end parts correspond to the test samples respectively, the edge strips of the end parts correspond to the end edges of the outer ring parts and are fixedly connected, and the two ends of the center part are fixedly connected to the center holes of the end parts respectively;

[0015] The outer ring is connected to the guide rod through a circular ring structure with concave edges, and a fan-shaped flow channel section on the surface of the test sample is formed between two adjacent test samples, the center piece and the outer ring.

[0016] Furthermore, the first heating device and the second heating device adopt a built-in heating structure, including a cylindrical structure consisting of an upper head, a lower head and a cylinder connected between the upper head and the lower head.

[0017] Furthermore, a water inlet is arranged at the center of the lower head, a water outlet is arranged at the center of the upper head, an electric heater mounting seat extending into the cylinder is fixedly arranged on the circumference around the water outlet of the upper head, and an immersion electric heater is sealedly connected to the electric heater mounting seat;

[0018] A mixing plate with a radius smaller than the inner diameter of the cylinder is arranged inside the cylinder, and circular holes corresponding to the positions of the electric heater mounting seats are arranged on the mixing plate, and the ends of the electric heater mounting seats are respectively fixedly arranged in the corresponding circular hole interfaces;

[0019] The side wall of the upper head is provided with a temperature monitor which can monitor the temperature of the liquid flow in the cylinder.

[0020] Furthermore, an external thread is provided at the end of the electric heater mounting seat extending out of the upper head portion, and an internal thread cover matching the external thread at the end of the electric heater mounting seat is fixedly provided on the electric heater. The electric heater is fixedly connected to the electric heater mounting seat by screwing the internal thread cover on the external thread at the end of the electric heater mounting seat, and a sealing gasket is provided between the internal thread cover of the electric heater and the end of the electric heater mounting seat for sealing.

[0021] Furthermore, the electric heater mounting seats are evenly arranged on the circumference around the water outlet of the upper head, the spacing between two adjacent electric heater mounting seats is 30-50mm, the spacing between the upper end surface of the mixing plate and the inner surface of the upper head is not less than 50mm, and the sealing gasket is a flexible graphite gasket.

[0022] Further, the integrated thermostat comprises a high-temperature section water inlet, a first high-temperature section straight pipe section connected to the high-temperature section water inlet, a high-temperature section water outlet, a second high-temperature section straight pipe section connected to the high-temperature section water outlet, a high-temperature section bent pipe section is connected between the ends of the first high-temperature section straight pipe section and the second high-temperature section straight pipe section, the other ends of the first high-temperature section straight pipe section and the second high-temperature section straight pipe section are fixedly connected to the tube sheet, the high-temperature section water inlet is connected to the outlet pipe of the circulation drive device through a drain valve, and the high-temperature section water outlet is respectively connected to the sampling device and the ultrafine filtration membrane inlet pipe;

[0023] The first high-temperature straight pipe section is sheathed on the outside of the first low-temperature straight pipe section, and the second high-temperature straight pipe section is sheathed on the outside of the second low-temperature straight pipe section. The ends of the first low-temperature straight pipe section and the second low-temperature straight pipe section are sealed and connected to the bottom of the tube sheet. The other ends of the first low-temperature straight pipe section and the second low-temperature straight pipe section are connected to the pipe box, and the high-temperature bent pipe section is arranged in the pipe box with a sufficient gap between the pipe box and the pipe box.

[0024] The side of the straight pipe section of the first low-temperature section is connected to the low-temperature section water outlet, and the low-temperature section water outlet is connected to the inlet of the circulation drive device through an isolation valve. The side of the straight pipe section of the second low-temperature section is connected to the low-temperature section water inlet, and the low-temperature section water inlet is connected to the outlet of the water quality adjustment box through a water injection pump.

[0025] The present invention also provides a method for testing material corrosion in a water chemical environment in a reactor, comprising the following steps:

[0026] Fill the high temperature environment system with water and increase the pressure step by step to detect leaks, ensuring that the pressure drop of each step within 10 minutes does not exceed 2.5%P;

[0027] When operating a high temperature environment system, when the temperature rises to 180℃-220℃, drain the high temperature environment system until the pressure regulator liquid level is in a reasonable range, and maintain the temperature of the high temperature environment system at 180℃-220℃;

[0028] When the temperature of the high temperature environment system rises, the water quality entering the high temperature environment system is monitored and regulated online through the water quality regulation system, so that the water quality obtained by online monitoring and offline sampling analysis meets the standards;

[0029] When the reactor is operated and the temperature rise of the high temperature environment system is observed and regulated to be no more than 40°C / h, the high temperature environment system is switched to automatic tracking control and the operation monitoring parameters are recorded at intervals;

[0030] The reactor is shut down, the high temperature environment system is cooled and reduced in pressure to the rated value, and the high temperature environment system is switched to automatic tracking control, and the operation monitoring parameters are recorded at intervals;

[0031] The corrosion test of the test sample is carried out to a predetermined time, and the corrosion condition of the test sample is checked.

[0032] The present invention provides an in-pile water chemical environment material corrosion test system, which consists of an optimized high-temperature environment system, a water quality adjustment system and a leakage monitoring system, and has the characteristics of simple system structure, high comprehensive performance, strong test reliability, etc.

[0033] Among them, the high temperature environment system of the present invention is a system that provides specific environmental water temperature and specific flow rate conditions for the test sample. It cancels the main heat exchanger of the traditional in-pile test loop. It forms a thermal balance through the reactor nuclear heating, electric heating of the high-efficiency heating device, and natural heat dissipation of the pipeline system, optimizes the system configuration, and reduces the complexity of the system. In addition, the in-pile irradiation device of the high temperature environment system adopts a low flow resistance in-pile test section design scheme. The fan-shaped flow channel section on the surface of the test sample is composed of two adjacent test samples, a center piece, and an outer ring piece. The flow channel section has no resistance loss, so that the surface of the test sample can obtain a higher flow rate during the test, making the test more in line with the in-pile service conditions of the sample, and improving the pertinence of the test. At the same time, the heating device of the high temperature environment system adopts a new built-in heating structure, which improves the traditional pipe outer hoop heater into a built-in high-efficiency heating device, improves the use efficiency of the electric heater, saves operating costs and energy, and improves economic benefits.

[0034] The water quality regulating system of the present invention is used to regulate the water quality in a high temperature environment system, and has the functions of filtering, ion adsorption, gas addition and liquid addition. The water quality regulating system sets its pressure reducing valve at the rear end of the ion exchange column, and can make full use of the pressure head of the high pressure system to overcome the pressure drop of the ultrafine filtration membrane and the ion exchange column. Compared with the method of first reducing the pressure in the traditional system and then using a dedicated driving pump to drive the circulation, the process is simplified and the complexity of the system is reduced. In addition, the pressure reducing valve is set to two in parallel, which overcomes the disadvantage that the system cannot be put into operation normally after the failure of a traditional single unit, and improves the reliability of the system. At the same time, the integrated thermostat of the water quality regulating system integrates the functions of the total cooler and preheater of the existing process system, forming an integrated thermostat with a compact structure, and its high temperature section can directly reduce the fluid temperature from high temperature to room temperature through heat exchange, and can heat the low temperature section to medium temperature through heat exchange. The high temperature section and the low temperature section adopt a single-channel countercurrent arrangement, and there is enough gap between the pipe box and the high temperature section bend pipe section pipeline to absorb the expansion of the high temperature section pipeline, while meeting the system cooling and heating, simplifying the equipment configuration, improving the economy of the system, and saving costs.

[0035] The leakage monitoring system of the present invention monitors whether the in-pile irradiation device leaks and ensures the safety of the reactor through specific parameter monitoring equipment such as temperature monitors, pressure monitors and humidity monitors on the pipeline between the in-pile irradiation device of the high-temperature environment system. In addition, the leakage monitoring system of the present invention cancels the gas circulation pump of the existing system, and forms a static gas system through the gas buffer tank, the electric venting valve, the air cavity of the in-pile irradiation device and the pipeline between them. Moreover, since the temperature, pressure, humidity and other parameters of the air cavity of the in-pile irradiation device under the leakage condition can still be monitored by the temperature monitor, pressure monitor and humidity monitor set on the pipeline, the present invention not only reduces the complexity of the system, but also improves the reliability of the system. During operation, when the pressure of the static gas system is lower than the operating limit, the electric venting valve automatically opens to inflate; when the pressure of the gas buffer tank is monitored to be too low, the second electric venting valve automatically opens to inflate the gas buffer tank, realizing automatic gas replenishment; compared with the manual gas replenishment method of the existing system, it reduces the operating intensity of the operator and improves the automation level of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a system for testing material corrosion in a water chemical environment in a reactor according to an embodiment of the present invention;

[0037] Figure 2 A schematic structural diagram of a low flow resistance in-pile test section of an in-pile irradiation device of an in-pile water chemical environment material corrosion test system provided by an embodiment of the present invention;

[0038] Figure 3A schematic structural diagram of an end component of a low flow resistance in-pile test section of an in-pile irradiation device in an in-pile water chemical environment material corrosion test system provided by an embodiment of the present invention;

[0039] Figure 4 A schematic diagram of the structure of a heating device for a material corrosion test system in a reactor water chemical environment provided by an embodiment of the present invention;

[0040] Figure 5 A schematic diagram of the structure of a mixing plate in a heating device of an in-core water chemical environment material corrosion test system provided by an embodiment of the present invention;

[0041] Figure 6 A schematic diagram of the structure of an integrated thermostat for an in-pile water chemical environment material corrosion test system provided by an embodiment of the present invention.

[0043] 1-1-01 In-pile irradiation device, 1-1-02 First heating device 1, 1-1-03 Voltage stabilizer, 1-1-04A First circulation drive device, 1-1-04B Second circulation drive device, 1-1-05 Second heating device; 1-2-01 Integrated thermostat, 1-2-02 Ultrafine filtration membrane, 1-2-03A First ion exchange column, 1-2-03B Second ion exchange column, 1-2-03C Third ion exchange column, 1-2-04A First pressure reducing valve, 1-2-04B Second pressure reducing valve, 1-2-05 Water quality regulating box, 1-2-06 Water quality regulating box heater, 1-2-07A First liquid adding device, 1-2-07B Second liquid adding device, 1-2-08A First gas adding device, 1-2-08B Second gas adding device, 1-2- 09A first water injection pump, 1-2-09B second water injection pump, 1-2-10 water quality adjustment system, 1-2-11 sampling device, 1-2-12 isolation valve, I-1 liquid level monitor, I-2 first pressure monitor, I-3 first temperature monitor, I-4 pH value monitor, I-5 dissolved oxygen concentration monitor, I-6 dissolved hydrogen solubility monitor, I-7 suspended matter concentration monitor, I-8 impurity ion concentration monitor, I-9 conductivity monitor; 1-3-01 high-pressure inert gas bottle, 1-3-02 gas buffer tank, 1-3-03 first electric air release valve, 1-3-04A / B safety valve, 1-3-05 isolation valve, 1-3-06 vacuum pump, 1-3-07 second electric air release valve, I-10 temperature monitor, I-11 pressure monitor, I-12 humidity monitor.

[0044] 2-1 guide rod, 2-2 sample, 2-3 center piece, 2-3-01 groove of center piece, 2-4 outer ring piece, 2-4-01 groove of outer ring piece, 2-5 end piece, 2-5-01 end piece rib, 2-5-02 end piece edge strip.

[0045] 3-1 upper head, 3-2 lower head, 3-3 cylinder, 3-4 immersion electric heater, 3-5 electric heater mounting base, 3-6 water inlet, 3-7 water outlet, 3-8 temperature monitor, 3-9 mixing plate.

[0046] 4-1 high temperature section water inlet, 4-2 high temperature section water outlet, 4-7 first high temperature section straight pipe section, 4-8 high temperature section curved pipe section, 4-9 second high temperature section straight pipe section, 4-3 low temperature section water inlet, 4-4 low temperature section water outlet, 4-6 first low temperature section straight pipe section, 4-5 tube sheet, 4-10 second low temperature section straight pipe section, 4-11 pipe box, 4-5-01 first interface ring of tube sheet, 4-5-02 second interface ring of tube sheet, 4-11-01 first nozzle of pipe box, 4-11-02 second nozzle of pipe box. DETAILED DESCRIPTION

[0047] See also Figure 1 An embodiment of the present invention provides an in-pile water chemical environment material corrosion test system, including a high-temperature environment system, a water quality adjustment system connected to the high-temperature environment system, and a leakage monitoring system connected to the high-temperature environment system. The high-temperature environment system provides samples with specific environmental water temperature, specific water flow rate and other conditions. The water quality adjustment system is used to adjust the water quality in the high-temperature environment system, and has multiple functions such as filtration, ion adsorption, gas addition, and liquid addition. The leakage monitoring system determines whether there is a leakage problem in the in-pile radiation device by monitoring specific parameters such as pressure of the high-temperature environment system, thereby ensuring the safety of the reactor. It has the characteristics of simple system structure, high comprehensive performance, and strong reliability.

[0048] Among them, the high-temperature environment system includes an in-pile irradiation device 1-1-01, the outlet of the in-pile irradiation device 1-1-01 is connected to the inlet pipe of the first heating device 1-1-02, the outlet of the first heating device 1-1-02 is connected to the inlet pipe of the circulation drive device, the outlet of the circulation drive device is connected to the inlet pipe of the second heating device 1-1-05, the outlet of the second heating device 1-1-05 is connected to the inlet pipe of the in-pile irradiation device 1-1-01, and a parallel stabilizer 1-1-03 is connected between the first heating device 1-1-02 and the second heating device 1-1-05.

[0049] The water quality regulating system includes an integrated thermostat 1-2-01 whose high-temperature section inlet is connected to the circulation drive device outlet pipe, the high-temperature section outlet of the integrated thermostat 1-2-01 is respectively connected to the sampling device 1-2-11 and the ultrafine filtration membrane 1-2-02 inlet pipe, the ultrafine filtration membrane 1-2-02 outlet is connected in parallel with multiple ion exchange column inlet pipes, the ion exchange column outlet is connected to the water quality regulating box 1-2-05 inlet pipe through a pressure reducing valve, the water quality regulating box 1-2-05 outlet is connected to the low-temperature section inlet pipe of the integrated thermostat 1-2-01 through a water injection pump, and the low-temperature section outlet of the integrated thermostat 1-2-01 is connected to the circulation drive device inlet pipe.

[0050] A liquid adding device and a gas adding device are arranged on the upper part of the water quality regulating box 1-2-05, a water quality regulating box heater 1-2-06 is arranged on the bottom of the water quality regulating box 1-2-05, and a liquid level monitor I-1, a pressure monitor I-2, a temperature monitor I-3, a pH value monitor I-4, a dissolved oxygen concentration monitor I-5, a dissolved hydrogen solubility monitor I-6, a suspended matter concentration monitor I-7, an impurity ion concentration monitor I-8 and a conductivity monitor I-9 are arranged on the side of the water quality regulating box 1-2-05.

[0051] The leakage monitoring system includes a gas buffer tank 1-3-02 connected to the in-pile irradiation device 1-1-01 via an electric purge valve 1-3-03 and a safety valve pipeline in sequence, a high-pressure inert gas bottle 1-3-01 connected to the gas buffer tank 1-3-02 via a second electric purge valve 1-3-07 pipeline, and a vacuum pump 1-3-06 connected to the in-pile irradiation device 1-1-01 and the pipeline between the safety valve via an isolation valve 1-3-05.

[0052] A temperature monitor I-10, a pressure monitor I-11 and a humidity monitor I-12 are installed on the pipeline between the isolation valve 1-3-05 and the in-pile irradiation device 1-1-01.

[0053] Among them, at least two circulation drive devices are set. When one circulation drive device is put into operation during system operation, the other circulation drive device is used as a backup. When one circulation drive device suddenly fails, the other backup circulation drive device can be operated in time.

[0054] As a specific embodiment of the present invention, the circulation drive device includes a first circulation drive device 1-1-04A and a second circulation drive device 1-1-04B. The inlets of the first circulation drive device 1-1-04A and the second circulation drive device 1-1-04B are respectively connected to the outlet pipe of the first heating device 1-1-02, and the outlets of the first circulation drive device 1-1-04A and the second circulation drive device 1-1-04B are respectively connected to the inlet pipe of the second heating device 1-1-05.

[0055] There are multiple ion exchange columns, through which impurity ions in water entering the high temperature environment system can be removed. Moreover, when the impurity ion concentration monitor I-8 detects that the impurity ion concentration in the water quality adjustment box 1-2-05 is too high, more ion exchange columns can be started to quickly reduce the impurity ion concentration in the water quality adjustment box 1-2-05 to a predetermined level.

[0056] As a specific embodiment of the present invention, the ion exchange column includes a first ion exchange column 1-2-03A, a second ion exchange column 1-2-03B and a third ion exchange column 1-2-03C, so that the impurity ion concentration in the water quality regulating box 1-2-05 is adjusted by starting one, two or three of the three ion exchange columns, and the impurity ion concentration in the water quality regulating box 1-2-05 is controlled within a predetermined concentration range.

[0057] As a specific embodiment of the present invention, the pressure reducing valve at the outlet of the ion exchange column is set to two, namely the first pressure reducing valve 1-2-04A and the second pressure reducing valve 1-2-04B. The present invention sets the pressure reducing valve of the water quality regulation system at the rear end of the ion exchange column, which can make full use of the pressure head of the high-pressure system to overcome the pressure drop of the ultrafine filtration membrane and the ion exchange column. Compared with the method of first reducing the pressure and then using a special driving pump to drive the circulation in the traditional system, the process is simplified and the complexity of the system is reduced. In addition, the pressure reducing valve is set to two in parallel, which overcomes the disadvantage that the system cannot be put into operation after a single traditional unit fails, and improves the reliability of the system.

[0058] As a specific embodiment of the present invention, two liquid adding devices and two gas adding devices are arranged on the upper part of the water quality regulating tank 1-2-05. Among them, the two liquid adding devices are the first liquid adding device 1-2-07A and the second liquid adding device 1-2-07B. When it is necessary to add liquid solution, liquid is added through the first liquid adding device 1-2-07A and the second liquid adding device 1-2-07B. And, according to the liquid level in the water quality regulating tank 1-2-05 monitored by the liquid level monitor I-1 arranged on the water quality regulating tank 1-2-05, one or both of the first liquid adding device 1-2-07A and the second liquid adding device 1-2-07B can be selected as needed to add liquid.

[0059] At the same time, two gas adding devices are also arranged on the upper part of the water quality regulating tank 1-2-05, namely the first gas adding device 1-2-08A and the second gas adding device 1-2-08B, which are respectively used to add oxygen and hydrogen to the water quality regulating tank 1-2-05. When the dissolved oxygen concentration monitor 1-5 and the dissolved hydrogen solubility monitor 1-6 detect that the dissolved oxygen and dissolved hydrogen need to be increased in the water quality regulating tank 1-2-05, oxygen and hydrogen can be added through the first gas adding device 1-2-08A and the second gas adding device 1-2-08B.

[0060] The cooling water of the high temperature environment system that needs to be regulated is flow-controlled through the drain valve 1-2-10, cooled to below 40°C through the integrated thermostat 1-2-01 (to meet the temperature requirements of the subsequent process), sampled before regulation through the sampling device 1-2-11, and removed from suspended matter and solid impurities through the ultrafine filtration membrane 1-2-02, and passed through the first ion exchange column 1-2-03A, the second ion exchange column 1-2-03B, and the third ion exchange column 1-2-03 C removes impurity ions, reduces the cooling water pressure to low pressure through the first pressure reducing valve 1-2-04A and the second pressure reducing valve 1-2-04B, enters the water quality regulating box 1-2-05 for water quality regulation, and then is pressurized and injected into the low-temperature section of the integrated thermostat 1-2-01 through the first water injection pump 1-2-09A and the second water injection pump 1-2-09B. After being heated to a high temperature (at least 200°C to reduce the thermal stress of the pipeline system) through the low-temperature section of the integrated thermostat 1-2-01, it returns to the high-temperature environment system.

[0061] Various parameter monitoring monitors are arranged on the water quality regulating tank 1-2-05, including a liquid level monitor I-1, a pressure monitor I-2, a temperature monitor I-3, a pH value monitor I-4, a dissolved oxygen concentration monitor I-5, a dissolved hydrogen solubility monitor I-6, a suspended matter concentration monitor I-7, an impurity ion concentration monitor I-8, and a conductivity monitor I-9. The above data can be monitored online in real time. When the temperature needs to be raised, the water quality regulating tank heater 1-2-06 is started. When liquid solution needs to be added, it is added through the first liquid adding device 1-2-07A and the second liquid adding device 1-2-07B. When the content of gas components (dissolved oxygen, dissolved hydrogen) needs to be increased, it is added through the first gas adding device 1-2-08A and the second gas adding device 1-2-08B.

[0062] The first pressure reducing valve 1-2-04A and the second pressure reducing valve 1-2-04B of the water quality regulating system are arranged at the rear ends of the first ion exchange column 1-2-03A, the second ion exchange column 1-2-03B and the third ion exchange column 1-2-03C, and the pressure head of the high pressure system can be fully utilized to overcome the pressure drop of the ultrafine filtration membrane 1-2-02, the first ion exchange column 1-2-03A, the second ion exchange column 1-2-03B and the third ion exchange column 1-2-03C. Compared with the method of first reducing the pressure and then using a special driving pump to drive the circulation in the traditional system, the corrosion test system of the present invention simplifies the process and reduces the complexity of the system. In addition, the pressure reducing valves are set as two in parallel, namely the first pressure reducing valve 1-2-04A and the second pressure reducing valve 1-2-04B, which overcomes the disadvantage that the system cannot be put into operation after the failure of a single traditional pressure reducing valve, and improves the reliability of the system.

[0063] See also Figure 2 The in-pile irradiation device 1-1-01 adopts a low flow resistance in-pile test section design, which includes four guide rods 2-1 and multiple test section modules arranged between the four guide rods 2-1 and connected to each other. Among them, the test section module includes an outer ring 2-4, end parts 2-5 arranged at both ends of the outer ring 2-4, and a center part 2-3 arranged at the center of the outer ring 2-4 and connected to the end parts 2-5 at both ends. A plurality of test samples 2-2 are arranged radially in the same plane between the center part 2-3 and the outer ring 2-4, and the two ends of each test sample 2-2 are connected to the center part 2-3 and the outer ring 2-4 respectively.

[0064] As a specific embodiment of the present invention, there are eight test samples 2-2. In the test section module, the test samples 2-2 are arranged radially from the center, and the angle between two adjacent test samples 2-2 is 45°, so that 8 test samples 2-2 can be arranged in the entire circumference. One side of the test sample 2-2 is inserted into a groove 2-3-01 of the center piece 2-3, and the other side of the test sample 2-2 is inserted into the groove 2-4-01 corresponding to the outer ring piece 2-4. In addition, in order to avoid the test sample 2-2 from being stuck when it is taken out later, the surface of the test sample 2-2 in contact with the groove has at least a certain assembly gap, and at least 0.2mm gap is retained. Of course, according to the test requirements, the number of test samples 2-2 can be further increased, such as ten test samples 2-2 can be arranged, so that the angle between two adjacent test samples 2-2 is 36°.

[0065] See also Figure 3The end part 2-5 is a hollow design, the ribs 2-5-01 of the end part 2-5 correspond to the test sample 2-2, and the edge strips 2-5-02 of the end part 2-5 correspond to the edge of the end of the outer ring part 2-4 and are fixedly connected by welding. That is, the ribs 2-5-01 of the end part 2-5 correspond to the test sample 2-2 one by one, and the projections overlap, and the edge strips 2-5-02 of the end part 2-5 overlap and are fixed on the outer ring part 2-4. The two ends of the center part 2-3 are fixedly connected to the center hole 2-5-03 of the end part 2-5 by welding.

[0066] As a specific embodiment of the present invention, the outer ring 2-4 is provided with a concave annular structure 2-4-02 at the position where it is connected to the guide rod 2-1, and the outer ring 2-4 is connected to the guide rod 2-1 through its concave annular structure 2-4-02. In order to facilitate disassembly and installation, a certain gap is left between the concave annular structure 2-4-02 of the outer ring 2-4 and the guide rod 2-1, and a gap of at least 1 mm is reserved. The fan-shaped flow channel section on the surface of the test sample 2-2 is formed between two adjacent test samples 2-2, the center piece 2-3 and the outer ring 2-4.

[0067] When the water meets the water quality standards after being monitored and regulated by the water quality regulation system, enters the high temperature environment system from the integrated thermostat 1-2-01 through the isolation valve 1-2-12, it first passes through the first circulation drive device 1-1-04A and / or the second circulation drive device 1-1-04B to enter the second heating device 1-1-05, and then enters the in-pile irradiation device 1-1-01 after further heating by the second heating device 1-1-05. In the in-pile irradiation device 1-1-01, the test sample 2-2 is subjected to a corrosion test of the in-pile water chemical environment. After the water of the test sample 2-2 is discharged from the in-pile irradiation device 1-1-01, it is heated by the first heating device 1-1-02, and then driven by the first circulation drive device 1-1-04A or / and the second circulation drive device 1-1-04B to enter the second heating device 1-1-05, and then further heated by the second heating device 1-1-05 to enter the in-pile irradiation device 1-1-01. In this way, the test sample 2-2 can be repeatedly circulated in the in-pile irradiation device 1-1-01 to perform corrosion tests in the in-pile water chemical environment. Since the fan-shaped flow channel section on the surface of the test sample 2-2 formed between two adjacent test samples 2-2, the center piece 2-3 and the outer ring piece 2-4 has no resistance loss, the flow resistance of the test section is low, so that during the test process, the surface of the test sample 2-2 can obtain a higher flow rate, and its surface flow rate can be as high as 10m / s, so that the test can be more in line with the service conditions of the test sample 2-2 in the pile, and the pertinence and accuracy of the test are improved.

[0068] Furthermore, the present invention can not only heat the water used for the corrosion test of the test sample 2-2 by the first heating device 1-1-02 and the second heating device 1-1-05, but also can perform a cyclic corrosion test on the test sample 2-2 by the thermally balanced water formed by the nuclear heating of the reactor and the natural heat dissipation of the piping system, thereby providing a specific ambient water temperature and a specific liquid flow rate condition for the in-core water chemical environment corrosion test of the test sample 2-2, which not only optimizes the system configuration, reduces the complexity of the system, and reduces the system thermal power loss, but also improves the authenticity and accuracy of the in-core water chemical environment corrosion test.

[0069] See also Figure 4 The first heating device 1-1-02 and the second heating device 1-1-05 adopt a built-in heating structure, which includes a cylindrical structure consisting of an upper head 3-1, a lower head 3-2 and a cylinder 3-3 connected between the upper head 3-1 and the lower head 3-2. The upper end of the cylinder (3-3) and the upper head (3-1) are butt-welded together through an upper end weld (3-10) set on the straight cylinder wall, and the lower end of the cylinder (3-3) and the lower head (3-2) are butt-welded together through a lower end weld (3-11) set on the straight cylinder wall.

[0070] The water inlet 3-6 is arranged at the center of the lower end cap 3-2, and the water outlet 3-7 is arranged at the center of the upper end cap 3-1. An electric heater mounting seat 3-5 extending into the cylinder 3-3 is fixedly arranged on the circumference around the water outlet 3-7 of the upper end cap 3-1, and an immersion electric heater 3-4 is connected inside the electric heater mounting seat 3-5. When the electric heater mounting seat 3-5 is assembled with the upper end cap 3-1, it is first installed by cold installation or expansion connection, and then circumferentially welded to the inner and outer surfaces of the upper end cap 3-1 and the electric heater mounting seat 3-5 respectively.

[0071] As a specific embodiment of the present invention, the portion of the electric heater mounting seat 3-5 extending out of the upper head 3-1 is provided with an external thread, and the electric heater 3-4 is fixedly provided with an internal thread cover 3-4-01 matching the external thread at the end of the electric heater mounting seat 3-5. When the electric heater 3-4 is installed, the electric heater 3-4 is screwed onto the external thread at the end of the electric heater mounting seat 3-5 through the internal thread cover 3-4-01, and the electric heater 3-4 is fixedly connected to the electric heater mounting seat 3-5. In addition, in order to ensure the airtightness of the connection between the electric heater 3-4 and the electric heater mounting seat 3-5, a sealing gasket 3-4-02 is provided between the internal thread cover 3-4-01 of the electric heater 3-4 and the end of the electric heater mounting seat 3-5, and the sealing gasket 3-4-02 is pressed by the thread cover 3-4-01 of the electric heater 3-4, and then screwed onto the external thread at the end of the electric heater mounting seat 3-5 for sealing.

[0072] As a specific embodiment of the present invention, the material of the sealing gasket 3-4-02 can be flexible graphite.

[0073] As a specific embodiment of the present invention, the electric heaters 3-4 are arranged uniformly in a circle along with the electric heater mounting base 3-5, and the distance between each two electric heaters 3-4 is not less than the size requirement of the electric heater threaded cover 3-4-01 operating tool, which is generally set to 30-50mm.

[0074] See also Figure 5 A mixing plate 3-9 having a radius smaller than the inner diameter of the cylinder 3-3 is arranged in the cylinder 3-3, and the mixing plate 3-9 is a solid circular plate. A circular hole 3-9-01 corresponding to the assembly position of the electric heater mounting seat 3-5 is arranged on the mixing plate 3-9, and the ends of each electric heater mounting seat 3-5 are fixedly arranged in the corresponding circular hole interface 3-9-01. After the electric heater mounting seat 3-5 is inserted into the circular hole interface 3-9-01, the electric heater mounting seat 3-5 and the circular hole interface 3-9-01 are fixedly connected together by welding.

[0075] In addition, in order to reduce the resistance of liquid flow, a certain distance needs to be maintained between the upper end surface of the mixing plate 3-9 and the inner surface of the upper head 3-1. As a specific embodiment of the present invention, the distance between the upper end surface of the mixing plate 3-9 and the inner surface of the upper head 3-1 should be at least 50 mm.

[0076] Furthermore, in order to monitor the temperature of the liquid flow in the first heating device 1-1-02 and the second heating device 1-1-05 at any time, a temperature monitor 3-8 is provided on the side wall of the upper head 3-1 for monitoring the temperature of the liquid flow in the cylinder 3-3.

[0077] See also Figure 6 The integrated thermostat 1-2-01 includes a high temperature section and a low temperature section. The high temperature section includes a high temperature section water inlet 4-1, a first high temperature section straight pipe section 4-7 connected to the high temperature section water inlet 4-1, a high temperature section water outlet 4-2, a second high temperature section straight pipe section 4-9 connected to the high temperature section water outlet 4-2, a high temperature section elbow section 4-8 connected between the ends of the first high temperature section straight pipe section 4-7 and the second high temperature section straight pipe section 4-9, and the other ends of the first high temperature section straight pipe section 4-7 and the second high temperature section straight pipe section 4-9 are fixedly connected to the tube sheet 4-5. The high temperature section water inlet 4-1, the high temperature section water outlet 4-2, the first high temperature section straight pipe section 4-7, the high temperature section elbow section 4-8, and the second high temperature section straight pipe section 4-9 are all butt-welded together. Among them, the high-temperature section water inlet 4-1 is connected to the outlet pipe of the circulation drive device through the drain valve 1-2-10, and the high-temperature section water outlet 4-2 is connected to the sampling device 1-2-11 and the inlet pipe of the ultrafine filtration membrane 1-2-02 respectively.

[0078] As a specific embodiment of the present invention, when the first high-temperature section straight pipe section 4-7 connected to the high-temperature section water inlet 4-1 and the second high-temperature section straight pipe section 4-9 connected to the high-temperature section water outlet 4-2 are respectively connected and assembled with the tube sheet 4-5, they are first installed by cold installation or expansion connection, and then circumferential welding is performed on the inner and outer surfaces of the tube sheet 4-5 respectively.

[0079] The low temperature section includes a low temperature section water inlet 4-3, a low temperature section water outlet 4-4, a first low temperature section straight pipe section 4-6, a tube sheet 4-5, a second low temperature section straight pipe section 4-10, and a pipe box 4-11. The low temperature section water inlet 4-3 is connected to the second low temperature section straight pipe section 4-10, the low temperature section water outlet 4-4 is connected to the first low temperature section straight pipe section 4-6, and the first high temperature section straight pipe section 4-7 is externally sleeved with the first low temperature section straight pipe section 4-6, and the second high temperature section straight pipe section 4-9 is externally sleeved with the second low temperature section straight pipe section 4-10. One end of the first low-temperature section straight pipe section 4-6 is sealed and connected to the tube sheet 4-5 through the first interface ring position 4-5-01 on the tube sheet 4-5, and the other end of the first low-temperature section straight pipe section 4-6 is sealed and connected to the tube box 4-11 through the first nozzle position 4-11-01 on the tube box 4-11, one end of the second low-temperature section straight pipe section 4-10 is sealed and connected to the tube sheet 4-5 through the second interface ring position 4-5-02 on the tube sheet 4-5, and the other end of the second low-temperature section straight pipe section 4-10 is sealed and connected to the tube box 4-11 through the second nozzle position 4-11-02 on the tube box 4-11.

[0080] At the same time, the high temperature section bend 4-8 is arranged in the pipe box 4-11, and in order to ensure that the pipe box 4-11 absorbs the expansion of the high temperature section bend 4-8 when heated, a sufficient gap is left between the pipe box 4-11 and the high temperature section bend 4-8.

[0081] Among them, the low-temperature section water outlet 4-4 is connected to the inlet of the circulation drive device through the isolation valve 1-2-12, and the low-temperature section water inlet 4-3 is connected to the outlet of the water quality adjustment box 1-2-05 through the water injection pump.

[0082] The high temperature section of the integrated thermostat 1-2-01 provided by the present invention can directly reduce the fluid temperature from high temperature liquid to room temperature, and the low temperature section can heat the low temperature liquid to medium temperature. In addition, the high temperature section and the low temperature section adopt a single-channel countercurrent arrangement, the high temperature section water inlet 4-1 is close to the low temperature section water outlet 4-4, and the high temperature section water outlet 4-2 is close to the low temperature section water inlet 4-3, which is conducive to the heat exchange between the high temperature liquid entering the high temperature section and the low temperature liquid entering the low temperature section.

[0083] Since the traditional leakage monitoring system adopts the gas circulation monitoring method, the failure rate of its gas circulation pump is high, resulting in the system often failing to work properly. Therefore, the leakage monitoring system provided by the present invention cancels the gas circulation pump and adopts a leakage monitoring system consisting of a high-pressure inert gas bottle 1-3-01, a gas buffer tank 1-3-02, an electric vent valve 1-3-03, a first safety valve 1-3-04A, a second safety valve 1-3-04B, an isolation valve 1-3-05, a vacuum pump 1-3-06, a second electric vent valve 1-3-07, a temperature monitor 1-10, a pressure monitor 1-11, and a humidity monitor 1-12.

[0084] A static gas system is formed by the gas buffer tank 1-3-02, the electric vent valve 1-3-03, the air cavity of the in-pile irradiation device 1-1-01 and the pipeline therebetween. However, the temperature, pressure, humidity and other parameters of the air cavity of the in-pile irradiation device 1-1-01 under leakage conditions can still be monitored by the temperature monitor I-10, pressure monitor I-11 and humidity monitor I-12 arranged on the pipeline. Therefore, the present invention not only reduces the complexity of the system, but also reduces the failure frequency of the leak detection system, thereby improving the reliability of the system.

[0085] During operation, first close the first electric air release valve 1-3-03, open the isolation valve 1-3-05, and start the vacuum pump 1-3-06 to evacuate the above-mentioned static gas system. Then close the vacuum pump 1-3-06, close the isolation valve 1-3-05, open the first electric air release valve 1-3-03 to inflate the above-mentioned static gas system. After the inflation pressure meets the requirements, close the first electric air release valve 1-3-03. During operation, when the pressure of the above-mentioned static gas system is lower than the operating limit, the first electric air release valve 1-3-03 automatically opens for inflation; when the pressure of the gas buffer tank 1-3-02 is monitored to be too low, the second electric air release valve 1-3-07 automatically opens to inflate the gas buffer tank 1-3-02, realizing automatic air replenishment. When under leakage conditions, the pressure of the above-mentioned static gas system will rise sharply, and at this time the first safety valve 1-3-04A or / and the second safety valve 1-3-04B automatically opens. Since the present invention provides two safety valves, the first safety valve 1-3-04A and the second safety valve 1-3-04B, when one of the safety valves fails, the other safety valve can be quickly started, thereby ensuring the safety of system operation.

[0086] The present invention provides a method for testing material corrosion in a water chemical environment in a reactor, comprising the following steps:

[0087] 1) Fill the high temperature environment system with water and increase the pressure step by step to detect leaks, ensuring that the pressure drop of each step within 10 minutes does not exceed 2.5%P;

[0088] 2) When the high temperature environment system is operated and the temperature rises to 180℃-220℃, the high temperature environment system is drained to the regulator (1-1-03) so that the liquid level is within a reasonable range and the temperature of the high temperature environment system is maintained at 180℃-220℃;

[0089] 3) When the high temperature environment system is heated up, the water quality entering the high temperature environment system is monitored and regulated online through the water quality regulation system, so that the water quality obtained by online monitoring and offline sampling analysis meets the standards;

[0090] 4) When the reactor is operated and the temperature rise of the high temperature environment system is observed and regulated to be no more than 40°C / h, the high temperature environment system is switched to automatic tracking control and the operation monitoring parameters are recorded at intervals;

[0091] 5) The reactor is shut down, the high temperature environment system is cooled and reduced in pressure to the rated value, and the high temperature environment system is switched to automatic tracking control, and the operation monitoring parameters are recorded at intervals;

[0092] 6) Carry out the corrosion test on the test sample (2-2) until a predetermined time, and check the corrosion condition of the test sample (2-2).

[0093] Specifically, the present invention provides a method for testing the corrosion of materials in a water chemical environment in a reactor, including a system pressure-boosting leak detection operation method, a system temperature-boosting operation method, a system water quality preparation method, a system steady-state operation method, and a system temperature-lowering and pressure-lowering operation method. The test method steps and the working principles involved in the method process are as follows.

[0094] (I) The boost leak detection operation method is as follows:

[0095] Step 1: After the system is assembled, first fill it with water and exhaust it until no gas is discharged from each drain port;

[0096] Step 2: For high-pressure systems, conduct leak detection at least at four pressure levels, such as 50%P, 75%P, 90%P, and 100%P, where P is the system operating pressure.

[0097] Step 3: After the pressure stabilizes, the pressure holding time of each stage shall not be less than 10 minutes, and the qualified standard is that the pressure drop within 10 minutes does not exceed 2.5%P.

[0098] (II) The system heating operation method is as follows:

[0099] Step 1: Put high-efficiency heating device 1 and high-efficiency heating device 2 into use. The input power shall not exceed 50% of the full power. At the same time, it is necessary to ensure that the system heating rate does not exceed 40℃ / h;

[0100] Step 2: When the system temperature rises to about 200℃, open the system drain valve to drain water until the stabilizer liquid level is observed to be within a reasonable range, then stop draining water;

[0101] Step 3: Reduce the power of the high-efficiency heating device 1 and the high-efficiency heating device 2 to maintain the current temperature of the system.

[0102] (III) The system water quality preparation method is as follows:

[0103] Step 1: Start preparing the system water quality when the system starts to heat up;

[0104] Step 2: Use the online monitoring instrument of the water quality regulation system to determine the parameters that need to be adjusted. If the impurity ion concentration is too high, continue to invest in ion exchange columns. If the dissolved hydrogen degree is low, continue to invest in hydrogenation equipment to increase the hydrogen pressure in the water tank of the water quality regulation system. If the suspended matter concentration is too high, continue to invest in filters for filtration.

[0105] Step 3: Further verify water quality indicators through offline sampling at intervals;

[0106] Step 4: Only when the online monitoring instrument and offline sampling analysis results meet the requirements can it be proved that the water quality requirements are met.

[0107] (IV) The system steady-state operation method is as follows:

[0108] Step 1: After the reactor is started, observe the temperature rise of the system. If the temperature rise exceeds 40°C / h, further reduce the power of high-efficiency heating device 1 and high-efficiency heating device 2 until the temperature rise rate does not exceed 40°C / h.

[0109] Step 2: After the system reaches the rated parameters, the electric heating control of the high-efficiency heating device 1 and the high-efficiency heating device 2 is switched to the automatic gear, and the system performs automatic tracking control;

[0110] Step 3: Manually record system operation monitoring parameters at regular intervals.

[0111] (V) The system cooling and pressure reduction operation method is as follows:

[0112] Step 1: Cooling and depressurization operations are allowed only after the reactor is shut down;

[0113] Step 2: After the system reaches the rated parameters, the electric heating control of the high-efficiency heating device 1 and the high-efficiency heating device 2 is switched to the automatic gear, and the system performs automatic tracking control.

[0114] Step 3: Manually record system operation monitoring parameters every 2 hours.

[0115] (VI) After the corrosion test of the test sample reaches the predetermined time, the corrosion test is stopped and the corrosion condition of the test sample can be checked.

[0116] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. An in-pile water chemical environment material corrosion test system, characterized in that: It includes a high temperature environment system, a water quality regulating system connected to the high temperature environment system, and a leakage monitoring system connected to the high temperature environment system; The high temperature environment system comprises an in-pile irradiation device (1-1-01), the outlet of the in-pile irradiation device (1-1-01) is connected to the inlet pipeline of the first heating device (1-1-02), the outlet of the first heating device (1-1-02) is connected to the inlet pipeline of the circulation drive device, the outlet of the circulation drive device is connected to the inlet pipeline of the second heating device (1-1-05), the outlet of the second heating device (1-1-05) is connected to the inlet pipeline of the in-pile irradiation device (1-1-01), and a voltage stabilizer (1-1-03) is connected in parallel between the first heating device (1-1-02) and the second heating device (1-1-05); The water quality regulating system comprises an integrated thermostat (1-2-01) whose high temperature section inlet is connected to an outlet pipeline of a circulation drive device, the high temperature section outlet of the integrated thermostat (1-2-01) is respectively connected to a sampling device (1-2-11) and an inlet pipeline of an ultrafine filtration membrane (1-2-02), the outlet of the ultrafine filtration membrane (1-2-02) is connected in parallel to a plurality of inlet pipelines of ion exchange columns, the outlet of the ion exchange column is connected to an inlet pipeline of a water quality regulating box (1-2-05) via a pressure reducing valve, the outlet of the water quality regulating box (1-2-05) is connected to an inlet pipeline of a low temperature section of the integrated thermostat (1-2-01) via a water injection pump, and the outlet of the low temperature section of the integrated thermostat (1-2-01) is connected to an inlet pipeline of the circulation drive device; The upper part of the water quality regulating box (1-2-05) is provided with a liquid adding device and a gas adding device, the bottom of the water quality regulating box (1-2-05) is provided with a water quality regulating box heater (1-2-06), and the side of the water quality regulating box (1-2-05) is provided with a liquid level monitor (I-1), a pressure monitor (I-2), a temperature monitor (I-3), a pH value monitor (I-4), a dissolved oxygen concentration monitor (I-5), a dissolved hydrogen solubility monitor (I-6), a suspended matter concentration monitor (I-7), an impurity ion concentration monitor (I-8) and a conductivity monitor (I-9); The leakage monitoring system comprises a gas buffer tank (1-3-02) connected to the in-pile irradiation device (1-1-01) via an electric purge valve (1-3-03) and a safety valve pipeline in sequence, a high-pressure inert gas bottle (1-3-01) connected to the gas buffer tank (1-3-02) via a second electric purge valve (1-3-07) pipeline, and a vacuum pump (1-3-06) connected to the in-pile irradiation device (1-1-01) and the pipeline between the safety valve via an isolation valve (1-3-05); A temperature monitor (I-10), a pressure monitor (I-11) and a humidity monitor (I-12) are arranged on the pipeline between the isolation valve (1-3-05) and the in-pile irradiation device (1-1-01).

2. The in-pile water chemical environment material corrosion test system according to claim 1 is characterized by: The circulation drive device comprises a first circulation drive device (1-1-04A) and a second circulation drive device (1-1-04B), wherein the inlets of the first circulation drive device (1-1-04A) and the second circulation drive device (1-1-04B) are respectively connected to the outlet pipe of the first heating device (1-1-02), and the outlets of the first circulation drive device (1-1-04A) and the second circulation drive device (1-1-04B) are respectively connected to the inlet pipe of the second heating device (1-1-05).

3. The in-pile water chemical environment material corrosion test system according to claim 2 is characterized by: The in-pile irradiation device (1-1-01) adopts a low flow resistance in-pile test section design, wherein the test section comprises four guide rods (2-1) and a plurality of test section modules arranged between the four guide rods (2-1) and connected to each other, wherein the test section modules comprise an outer ring member (2-4), end members (2-5) arranged at both ends of the outer ring member (2-4), and a center member (2-3) arranged at the center of the outer ring member (2-4) and connected to the end members (2-5) at both ends, wherein a plurality of test samples (2-2) are arranged radially from the center in the same plane between the center member (2-3) and the outer ring member (2-4), and the two ends of each test sample (2-2) are respectively connected to the center member (2-3) and the outer ring member (2-4).

4. The in-pile water chemical environment material corrosion test system according to claim 3 is characterized by: The end member (2-5) is of hollow design, the ribs (2-5-01) of the end member (2-5) respectively correspond to the test sample (2-2), the edge strip (2-5-02) of the end member (2-5) corresponds to the end edge of the outer ring member (2-4) and is fixedly connected, and the two ends of the center member (2-3) are respectively fixedly connected to the center hole (2-5-03) of the end member (2-5); The outer ring member (2-4) is connected to the guide rod (2-1) via a circular ring structure (2-4-02) with inward concave portions on all sides, and a fan-shaped flow channel section on the surface of the test sample (2-2) is formed between two adjacent test samples (2-2), the center member (2-3) and the outer ring member (2-4).

5. The in-pile water chemical environment material corrosion test system according to claim 2 is characterized by: The first heating device (1-1-02) and the second heating device (1-1-05) adopt a built-in heating structure, including a cylindrical structure consisting of an upper head (3-1), a lower head (3-2) and a cylinder (3-3) connected between the upper head (3-1) and the lower head (3-2).

6. The in-pile water chemical environment material corrosion test system according to claim 5 is characterized by: A water inlet (3-6) is arranged at the center of the lower sealing head (3-2), a water outlet (3-7) is arranged at the center of the upper sealing head (3-1), an electric heater mounting seat (3-5) extending into the cylinder (3-3) is fixedly arranged on the circumference around the water outlet (3-7) of the upper sealing head (3-1), and the electric heater mounting seat (3-5) is sealed and connected to an immersion electric heater (3-4); A mixing plate (3-9) having a radius smaller than the inner diameter of the cylinder (3-3) is arranged in the cylinder (3-3); a circular hole (3-9-01) corresponding to the position of the electric heater mounting seat (3-5) is arranged on the mixing plate (3-9); and the end of each electric heater mounting seat (3-5) is fixedly arranged in the corresponding circular hole interface (3-9-01); The side wall of the upper sealing head (3-1) is provided with a temperature monitor (3-8) capable of monitoring the temperature of the liquid flow in the cylinder (3-3).

7. The in-pile water chemical environment material corrosion test system according to claim 6 is characterized by: The end of the electric heater mounting seat (3-5) extending out of the upper head (3-1) is provided with an external thread, and an internal thread cover (3-4-01) matching the external thread of the end of the electric heater mounting seat (3-5) is fixedly provided on the electric heater (3-4), and the electric heater (3-4) is fixedly connected to the electric heater mounting seat (3-5) by screwing the internal thread cover (3-4-01) on the external thread of the end of the electric heater mounting seat (3-5), and a sealing gasket (3-4-02) is provided between the internal thread cover (3-4-01) of the electric heater (3-4) and the end of the electric heater mounting seat (3-5) for sealing.

8. The in-pile water chemical environment material corrosion test system according to claim 7 is characterized by: The electric heater mounting seats (3-5) are evenly arranged on the circumference around the water outlet (3-7) of the upper head (3-1), the spacing between two adjacent electric heater mounting seats (3-5) is 30-50 mm, the spacing between the upper end surface of the mixing plate (3-9) and the inner surface of the upper head (3-1) is not less than 50 mm, and the sealing gasket (3-4-02) is a flexible graphite gasket.

9. The in-pile water chemical environment material corrosion test system according to claim 1 is characterized by: The integrated thermostat (1-2-01) comprises a high-temperature section water inlet (4-1), a first high-temperature section straight pipe section (4-7) connected to the high-temperature section water inlet (4-1), a high-temperature section water outlet (4-2), and a second high-temperature section straight pipe section (4-9) connected to the high-temperature section water outlet (4-2); a high-temperature section bent pipe section (4-8) is connected between the ends of the first high-temperature section straight pipe section (4-7) and the second high-temperature section straight pipe section (4-9); the other ends of the first high-temperature section straight pipe section (4-7) and the second high-temperature section straight pipe section (4-9) are fixedly connected to the tube sheet (4-5); the high-temperature section water inlet (4-1) is connected to the outlet pipe of the circulation drive device through a drain valve (1-2-10); and the high-temperature section water outlet (4-2) is respectively connected to the sampling device (1-2-11) and the inlet pipe of the ultrafine filtration membrane (1-2-02); The first high-temperature section straight pipe section (4-7) is externally sleeved with the first low-temperature section straight pipe section (4-6), and the second high-temperature section straight pipe section (4-9) is externally sleeved with the second low-temperature section straight pipe section (4-10); the ends of the first low-temperature section straight pipe section (4-6) and the second low-temperature section straight pipe section (4-10) are sealed and connected to the bottom of the tube sheet (4-5); the other ends of the first low-temperature section straight pipe section (4-6) and the second low-temperature section straight pipe section (4-10) are connected to the pipe box (4-11), and the high-temperature section bent pipe section (4-8) is arranged in the pipe box (4-11) with a sufficient gap between the pipe box (4-11); The side of the first low-temperature section straight pipe section (4-6) is connected to the low-temperature section water outlet (4-4), and the low-temperature section water outlet (4-4) is connected to the inlet of the circulation drive device through the isolation valve (1-2-12). The side of the second low-temperature section straight pipe section (4-10) is connected to the low-temperature section water inlet (4-3), and the low-temperature section water inlet (4-3) is connected to the outlet of the water quality adjustment box (1-2-05) through the water injection pump.

10. A method for testing corrosion of materials in a water chemical environment in a reactor, characterized in that: The steps include: Fill the high temperature environment system with water and increase the pressure step by step to detect leaks, ensuring that the pressure drop of each step within 10 minutes does not exceed 2.5%P; When operating the high temperature environment system, when the temperature rises to 180℃-220℃, drain the high temperature environment system to the regulator (1-1-03) so that the liquid level is in a reasonable range, and maintain the temperature of the high temperature environment system at 180℃-220℃; When the temperature of the high temperature environment system rises, the water quality entering the high temperature environment system is monitored and regulated online through the water quality regulation system, so that the water quality obtained by online monitoring and offline sampling analysis meets the standards; When the reactor is operated and the temperature rise of the high temperature environment system is observed and regulated to be no more than 40°C / h, the high temperature environment system is switched to automatic tracking control and the operation monitoring parameters are recorded at intervals; The reactor is shut down, the high temperature environment system is cooled and reduced in pressure to the rated value, and the high temperature environment system is switched to automatic tracking control, and the operation monitoring parameters are recorded at intervals; The corrosion test of the test sample (2-2) is carried out until a predetermined time, and the corrosion condition of the test sample (2-2) is checked.

Images