Device and method for testing temperature change resistance of flue anticorrosive coating

Abstract

The invention belongs to the technical field of power plant flue anticorrosive coatings, and relates to a flue anticorrosive coating temperature change resistance testing device and method. Comprising a circulating fan; an outlet of the circulating fan is respectively connected with a fifth electromagnetic valve and a sixth electromagnetic valve; the sixth electromagnetic valve is connected with the simulation flue; the simulation flue is connected with the eighth electromagnetic valve; the fifth electromagnetic valve and the seventh electromagnetic valve are both connected with an inlet of the third air heating device; an outlet of the third air heating device is respectively connected with the third electromagnetic valve and the fourth electromagnetic valve; the third electromagnetic valve is connected with an inlet of the second air heating device; an outlet of the second air heating device is connected with an inlet of the first air heating device; an outlet of the first air heating device is connected with the second electromagnetic valve; the fourth electromagnetic valve and the second electromagnetic valve are both connected with the first electromagnetic valve; and the first electromagnetic valve is connected with an inlet of the circulating fan. According to the invention, the performance of the anti-corrosion coating can be evaluated before flue corrosion prevention, so that the failure accident of the anti-corrosion coating is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of flue anticorrosion coatings in power plants, and relates to a device and method for testing the temperature change resistance of flue anticorrosion coatings. Background Art

[0002] As thermal power plants have increasingly stringent environmental protection requirements, harmful substances such as sulfur dioxide, sulfur trioxide, and nitrogen oxides contained in the flue gas of coal-fired units have become key factors affecting the long-term stable operation of equipment. The acidic corrosive gas in the flue gas will cause strong corrosion to the surface of metal equipment, resulting in a shortened service life of the unit equipment and even causing safety hazards. In order to reduce the erosion of flue gas on metal flues and other equipment, anti-corrosion coatings have become one of the important means to ensure the normal operation of the unit.

[0003] However, with the development of new energy power generation technology, especially the 300MW coal-fired units in thermal power plants gradually take on the task of peak load regulation, and the frequent start and stop have brought new challenges to the use of anti-corrosion coatings. During the start-up and shutdown of the peak load regulation units in thermal power plants, the temperature changes in the flue are extremely drastic. The temperature fluctuations and the alternating effects of hot and cold in the flue gas put forward higher requirements on the temperature resistance of the anti-corrosion coating. When the temperature of the flue gas changes, the coating will be affected by thermal expansion and contraction, resulting in cracking, bubbling, and shedding of the coating, which will cause the metal surface to be directly exposed, forming a corrosion channel, and ultimately leading to corrosion damage and leakage of metal equipment. In severe cases, it may even endanger the safe and stable operation of the unit.

[0004] In addition, since coal-fired units in thermal power plants usually face a harsh working environment, the anti-corrosion coating not only needs to withstand the test of high temperature, high humidity and other environments, but also needs to deal with the erosion of the coating by the complex chemical composition of flue gas. This requires the anti-corrosion coating to have stronger resistance to high temperature, acid and alkali corrosion, and long-term stability in design and use, in order to prevent greater maintenance costs, downtime and pollutant emissions caused by coating failure.

[0005] Based on the above background, the temperature change resistance of anti-corrosion coatings has become one of the key indicators for evaluating their reliability and effectiveness. In order to ensure that the anti-corrosion coating can maintain stable performance in a high temperature environment and avoid coating failure and metal corrosion caused by temperature fluctuations, it is urgent to develop a scientific and efficient inspection device and method to conduct strict temperature change resistance testing before the application of the anti-corrosion coating. Summary of the invention

[0006] The purpose of the present invention is to solve the problems in the prior art and to provide a device and method for testing the temperature change resistance of a flue anti-corrosion coating, which can effectively test the temperature change resistance performance of the anti-corrosion coating.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a flue anticorrosive coating temperature change resistance inspection device, comprising a circulating fan; the circulating fan outlet is respectively connected to a fifth solenoid valve and a sixth solenoid valve; the sixth solenoid valve is connected to a simulated flue; the simulated flue is connected to an eighth solenoid valve; the fifth solenoid valve and the seventh solenoid valve are both connected to an inlet of a third air heating device; The outlet of the third air heating device is respectively connected to the third solenoid valve and the fourth solenoid valve; the third solenoid valve is connected to the inlet of the second air heating device; the outlet of the second air heating device is connected to the inlet of the first air heating device; the outlet of the first air heating device is connected to the second solenoid valve; the fourth solenoid valve and the second solenoid valve are both connected to the first solenoid valve; the first solenoid valve is connected to the inlet of the circulating fan.

[0008] Preferably, the circulating fan inlet is provided with an air suction solenoid valve.

[0009] Preferably, an exhaust solenoid valve is provided on the simulated flue.

[0010] Preferably, a first heating rod is disposed inside the first air heating device; a second heating rod is disposed inside the second air heating device; and a third heating rod is disposed inside the third air heating device.

[0011] Preferably, a first temperature sensor is provided at the outlet of the circulating fan; and a second temperature sensor is provided on the simulated flue.

[0012] Preferably, the simulated flue is provided with a hole; and a coating test piece is arranged in the hole.

[0013] Preferably, it also includes an intelligent control device; the circulating fan, the first temperature sensor, the first heating rod, the second temperature sensor, the first solenoid valve, the air intake solenoid valve, the second solenoid valve, the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve, the sixth solenoid valve, the seventh solenoid valve, the exhaust solenoid valve, the second heating rod and the third heating rod are all electrically connected to the intelligent control device.

[0014] In a second aspect, the present invention provides a method for testing the temperature change resistance of a flue anticorrosion coating, comprising the following steps: Single heating mode: air enters the fifth solenoid valve through the outlet of the circulating fan, passes through the fourth solenoid valve after being heated by the third air heating device, and then passes through the first solenoid valve to enter the inlet of the circulating fan; the first thermocouple temperature sensor monitors the circulating temperature, controls the power of the third heating rod, and stabilizes the circulating temperature at 95~105℃; after the circulating temperature reaches the set temperature, the sixth solenoid valve and the seventh solenoid valve are opened, and the fifth solenoid valve is closed; the heated air passes through the simulated flue to heat the coating test piece; the second thermocouple temperature sensor monitors the temperature value of the inner surface of the simulated flue, and when the set temperature value is reached, the air intake solenoid valve and the exhaust solenoid valve are opened, and the seventh solenoid valve is closed at the same time, and the cold air is sucked in from the air intake solenoid valve, passes through the sixth solenoid valve into the simulated flue, cools the coating test piece, and is then discharged from the exhaust solenoid valve, so that the coating test piece completes a hot and cold alternating temperature change; Common heating mode: air enters the fifth solenoid valve through the outlet of the circulating fan, is heated by the third air heating device, and then passes through the second air heating device and the first air heating device in sequence through the third solenoid valve; the air heated by the first air heating device passes through the second solenoid valve and the first solenoid valve to enter the inlet of the circulating fan; the first thermocouple temperature sensor monitors the circulating temperature, controls the power of the first heating rod, the second heating rod and the third heating rod, and stabilizes the circulating temperature at 195~205℃; after the circulating temperature reaches the set temperature, the sixth solenoid valve and the seventh solenoid valve are opened, and the fifth solenoid valve is closed; the heated air passes through the simulated flue to heat the coating test piece; the second thermocouple temperature sensor monitors the temperature value of the inner surface of the simulated flue, and when the set temperature value is reached, the air intake solenoid valve and the exhaust solenoid valve are opened, and the seventh solenoid valve is closed at the same time, and the cold air is sucked in from the air intake solenoid valve, passes through the sixth solenoid valve into the simulated flue, cools the coating test piece, and is then discharged from the exhaust solenoid valve, so that the coating test piece completes a hot and cold alternating temperature change.

[0015] Preferably, the single heating mode is used to test coating specimens in an applicable environment below 80°C.

[0016] Preferably, the common heating mode is used to test coating specimens in an applicable environment below 160°C.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention realizes the circulation of air flow inside the device through a circulating fan, heats the air through an air heating device, and can select different modes to heat the air by controlling the switch of a valve, thereby improving the applicability of the device for testing anti-corrosion coatings with different temperature requirements; by simulating the temperature, airflow and flue gas composition of an actual thermal power plant flue through a simulated flue, a real test environment is provided for the temperature change resistance of the anti-corrosion coating.

[0018] Furthermore, by controlling the opening and closing of the valve, the anti-corrosion coating can be cooled or heated, thereby simulating the thermal stress in the actual working environment, which is helpful to test the performance and stability of the coating under high or low temperature conditions. The present invention can evaluate the performance of the anti-corrosion coating before implementing flue anti-corrosion, avoid the occurrence of anti-corrosion coating failure accidents, and ensure the safe operation of the thermal power generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of a device for testing the temperature change resistance of a flue anticorrosive coating according to the present invention; Among them: 1. circulating fan; 2. first temperature sensor; 3. first air heating device; 4. second air heating device; 5. third air heating device; 6. first heating rod; 7. simulated flue; 8. coating test piece; 9. second temperature sensor; 10. first solenoid valve; 11. air intake solenoid valve; 12. second solenoid valve; 13. third solenoid valve; 14. fourth solenoid valve; 15. fifth solenoid valve; 16. sixth solenoid valve; 17. seventh solenoid valve; 18. exhaust solenoid valve; 19. second heating rod; 20. third heating rod. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0024] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings: The first object of the present invention is to provide a flue anticorrosive coating temperature change test device, such as Figure 1 As shown, it includes a circulating fan 1; the outlet of the circulating fan 1 is respectively connected to the fifth solenoid valve 15 and the sixth solenoid valve 16; the sixth solenoid valve 16 is connected to the simulated flue 7; the simulated flue 7 is connected to the eighth solenoid valve 17; the fifth solenoid valve 15 and the seventh solenoid valve 17 are both connected to the inlet of the third air heating device 5; the outlet of the third air heating device 5 is respectively connected to the third solenoid valve 13 and the fourth solenoid valve 14; the third solenoid valve 13 is connected to the inlet of the second air heating device 4; the outlet of the second air heating device 4 is connected to the inlet of the first air heating device 3; the outlet of the first air heating device 3 is connected to the second solenoid valve 12; the fourth solenoid valve 14 and the second solenoid valve 12 are both connected to the first solenoid valve 10; the first solenoid valve 10 is connected to the inlet of the circulating fan 1.

[0028] The circulating fan 1 is responsible for the circulation of the air flow inside the device, and ensures that the air flows evenly in the device by adjusting the speed of the air flow; the first air heating device 3, the second air heating device 4 and the third air heating device 5 all realize the heating function of the air. By controlling the switch of the valve, different modes can be selected to heat the air, such as heating the air only through the third air heating device 5 or heating the air together through the first air heating device 3, the second air heating device 4 and the third air heating device 5. The simulated flue 7 is used to simulate the temperature, airflow and flue gas composition of the actual flue of a thermal power plant. It simulates the working conditions in the flue and provides a real test environment for the temperature change resistance of the anti-corrosion coating. Secondly, by controlling the switch of the valve, the anti-corrosion coating can be cooled or heated, thereby simulating the thermal stress in the actual working environment, which is helpful to test the performance and stability of the coating under high or low temperature conditions.

[0029] The inlet of the circulating fan 1 is provided with an air suction solenoid valve 11, and the simulated flue 7 is provided with an exhaust solenoid valve 18. The air suction solenoid valve is used to inhale cold air to cool the anti-corrosion coating, and the cold air is then discharged through the exhaust solenoid valve 18.

[0030] The first air heating device 3 is provided with a first heating rod 6; the second air heating device 4 is provided with a second heating rod 19; the third air heating device 5 is provided with a third heating rod 20. The air heating devices are all closed cylinders made of φ108×800mm stainless steel pipes. The heating rod is located in the middle of the closed cylinder, and the top is flood-sealed. The heating rod has a power of 5KW, and the heating rod achieves uniform heating of the air.

[0031] The outlet of the circulating fan 1 is provided with a first temperature sensor 2; the simulated flue 7 is provided with a second temperature sensor 9. The first temperature sensor 2 can detect the gas temperature (i.e., the circulating temperature) at the outlet of the circulating fan 1 in real time, and the second temperature sensor 9 can monitor the gas temperature in the flue, and control the heating power by real-time monitoring the temperature to reach the set test temperature. Preferably, the temperature sensor is a thermocouple temperature sensor.

[0032] The simulated flue 7 is provided with holes; the holes are provided with coating test pieces 8. Specifically, the simulated flue 7 is surrounded by stainless steel plates to form a rectangular barrel shape with dimensions of 150×150×800mm, and three 50×100mm holes are opened on each of the four vertical sides, and the coating test pieces 8 are installed in the holes, that is, three coating test pieces 8 are installed on a single side. Multi-point testing can more comprehensively understand the performance of the coating test pieces 8 at different positions, avoiding test deviation caused by only a single test piece.

[0033] Exemplarily, the number and size of the holes can also be adjusted to achieve more or smaller hole configurations according to experimental requirements to simulate different ventilation, flow rates or material transfer conditions. A temperature and humidity control system is set inside the simulated flue 7 to accurately simulate the effects of different climatic conditions on the coated test piece 8. Through the second temperature sensor 9 and the humidity control system, the simulated environment can be made more dynamic and changeable, and closer to the actual application scenario. In addition, the present invention adds an airflow control system (including a fan, a wind direction adjustment plate, and an airflow control valve, etc.) in the simulated flue 7, which can accurately adjust the airflow speed, direction and turbulence, so as to more accurately simulate the characteristics of smoke flow in different industrial applications. By adjusting the speed of the fan, the wind direction adjustment plate, and the airflow control valve, different flow patterns of smoke in the actual environment can be simulated.

[0034] The flue anticorrosion coating temperature change test device of the present invention also includes an intelligent control device; the circulating fan 1, the first temperature sensor 2, the first heating rod 6, the second temperature sensor 9, the first solenoid valve 10, the air intake solenoid valve 11, the second solenoid valve 12, the third solenoid valve 13, the fourth solenoid valve 14, the fifth solenoid valve 15, the sixth solenoid valve 16, the seventh solenoid valve 17, the exhaust solenoid valve 18, the second heating rod 19 and the third heating rod 20 are all electrically connected to the intelligent control device. The intelligent control device can realize the automatic control of the entire system, improve the automation degree, accuracy, operability and safety of the device, and provide a more efficient, accurate and reliable guarantee for the temperature change resistance performance test of the flue anticorrosion coating.

[0035] The second object of the present invention is to provide a method for testing the temperature change resistance of a flue anticorrosive coating, comprising the following steps: Single heating mode: air enters the fifth solenoid valve 15 through the outlet of the circulating fan 1, passes through the fourth solenoid valve 14 after being heated by the third air heating device 5, and then passes through the first solenoid valve 10 to enter the inlet of the circulating fan 1; the first thermocouple temperature sensor 2 monitors the circulating temperature, controls the power of the third heating rod 20, and stabilizes the circulating temperature at 95~105℃; after the circulating temperature reaches the set temperature, the sixth solenoid valve 16 and the seventh solenoid valve 17 are opened, and the fifth solenoid valve 15 is closed; the heated air passes through the simulated flue 7 to heat the coating test piece 8; the second thermocouple temperature sensor 9 monitors the temperature value of the inner surface of the simulated flue 7, and when the set temperature value is reached, the air intake solenoid valve 11 and the exhaust solenoid valve 18 are opened, and the seventh solenoid valve 17 is closed at the same time, and the cold air is sucked in from the air intake solenoid valve 11, passes through the sixth solenoid valve 16 into the simulated flue 7, cools the coating test piece 8, and then is discharged from the exhaust solenoid valve 18, so that the coating test piece 8 completes a hot and cold alternating temperature change; Common heating mode: air enters the fifth solenoid valve 15 through the outlet of the circulating fan 1, and after being heated by the third air heating device 5, passes through the third solenoid valve 13 and then passes through the second air heating device 4 and the first air heating device 3 in sequence; the air heated by the first air heating device 3 passes through the second solenoid valve 12 and the first solenoid valve 10 and enters the inlet of the circulating fan 1; the first thermocouple temperature sensor 2 monitors the circulating temperature, controls the power of the first heating rod 6, the second heating rod 19 and the third heating rod 20, and stabilizes the circulating temperature at 195~205℃; after the circulating temperature reaches the set temperature, the The sixth solenoid valve 16 and the seventh solenoid valve 17 are opened, and the fifth solenoid valve 15 is closed; the heated air passes through the simulated flue 7 to heat the coating test piece 8; the second thermocouple temperature sensor 9 monitors the temperature value of the inner surface of the simulated flue 7. When the set temperature value is reached, the air intake solenoid valve 11 and the exhaust solenoid valve 18 are opened, and the seventh solenoid valve 17 is closed at the same time. Cold air is sucked in from the air intake solenoid valve 11, enters the simulated flue 7 through the sixth solenoid valve 16, cools the coating test piece 8, and is then discharged from the exhaust solenoid valve 18, so that the coating test piece 8 completes a hot and cold alternating temperature change.

[0036] Among them, when testing the coating test piece 8 with an applicable environment below 80°C, an alternating hot and cold cycle of room temperature and high temperature of 95~105°C is used, and three cycles of tests are carried out, using a single heating mode. When testing the coating test piece 8 with an applicable environment below 160°C, an alternating hot and cold cycle of room temperature and high temperature of 195~205°C is used, and three cycles of tests are carried out, using a common heating mode. Alternating hot and cold cycles can simulate the temperature fluctuations that the coating may experience in the actual use environment, especially the common day and night temperature differences or temperature changes in process operations. Through this test, the coating's tolerance to repeated thermal expansion and contraction can be evaluated.

[0037] Secondly, the device of the present invention can also independently start the second air heating device 4 or the first air heating device 3 and the third air heating device 5 for joint heating, so as to achieve different set temperatures. This on-demand heating design not only reduces the operating cost, but also conforms to the concept of green environmental protection.

[0038] For example, after three cycles of testing, the temperature variation resistance of the coating is evaluated, and the surface state after the test can be observed under a microscope. If the coating has no cracks, discoloration or delamination under the microscope, it means that the coating has good temperature variation resistance. Before implementing flue corrosion protection, testing and evaluating the temperature variation resistance of the coating can detect possible deficiencies in the coating early. Failure of the coating may result in the inability to perform the flue corrosion protection function, and may even cause direct damage to the equipment. By conducting strict temperature variation resistance tests on the coating, it can be ensured that the anti-corrosion coating will not crack, fall off or discolor in a high temperature environment, thereby avoiding the occurrence of coating failure accidents and ensuring the safe operation of thermal power generating units.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flue anticorrosion coating temperature change test device, characterized in that: The air conditioner comprises a circulating fan (1); the outlet of the circulating fan (1) is respectively connected to a fifth solenoid valve (15) and a sixth solenoid valve (16); the sixth solenoid valve (16) is connected to a simulated flue (7); the simulated flue (7) is connected to an eighth solenoid valve (17); the fifth solenoid valve (15) and the seventh solenoid valve (17) are both connected to an inlet of a third air heating device (5); The outlet of the third air heating device (5) is respectively connected to the third solenoid valve (13) and the fourth solenoid valve (14); the third solenoid valve (13) is connected to the inlet of the second air heating device (4); the outlet of the second air heating device (4) is connected to the inlet of the first air heating device (3); the outlet of the first air heating device (3) is connected to the second solenoid valve (12); the fourth solenoid valve (14) and the second solenoid valve (12) are both connected to the first solenoid valve (10); and the first solenoid valve (10) is connected to the inlet of the circulation fan (1).

2. A flue anticorrosion coating temperature change test device according to claim 1, characterized in that: The inlet of the circulating fan (1) is provided with an air suction solenoid valve (11).

3. A flue anticorrosion coating temperature change test device according to claim 1, characterized in that: An exhaust solenoid valve (18) is provided on the simulated flue (7).

4. A flue anticorrosion coating temperature change test device according to claim 1, characterized in that: The first air heating device (3) is provided with a first heating rod (6); the second air heating device (4) is provided with a second heating rod (19); and the third air heating device (5) is provided with a third heating rod (20).

5. The device for testing the temperature change resistance of flue anticorrosion coating according to claim 1 is characterized in that: The outlet of the circulation fan (1) is provided with a first temperature sensor (2); and the simulated flue (7) is provided with a second temperature sensor (9).

6. A flue anticorrosion coating temperature change test device according to claim 1, characterized in that: The simulated flue (7) is provided with a hole; and a coating test piece (8) is arranged in the hole.

7. The device for testing the temperature change resistance of flue anticorrosion coating according to claim 1 is characterized in that: It also includes an intelligent control device; the circulating fan (1), the first temperature sensor (2), the first heating rod (6), the second temperature sensor (9), the first solenoid valve (10), the air intake solenoid valve (11), the second solenoid valve (12), the third solenoid valve (13), the fourth solenoid valve (14), the fifth solenoid valve (15), the sixth solenoid valve (16), the seventh solenoid valve (17), the exhaust solenoid valve (18), the second heating rod (19) and the third heating rod (20) are all electrically connected to the intelligent control device.

8. A method for testing the temperature change resistance of flue anticorrosion coating, characterized in that: The device for testing the temperature change resistance of the flue anticorrosive coating according to any one of claims 1 to 7 is used, comprising the following steps: Single heating mode: air enters the fifth solenoid valve (15) through the outlet of the circulation fan (1), passes through the fourth solenoid valve (14) after being heated by the third air heating device (5), and then passes through the first solenoid valve (10) to enter the inlet of the circulation fan (1); the first thermocouple temperature sensor (2) monitors the circulation temperature and controls the power of the third heating rod (20) to stabilize the circulation temperature at 95-105°C; when the circulation temperature reaches the set temperature, the sixth solenoid valve (16) and the seventh solenoid valve (17) are opened, and the fifth solenoid valve (15) is closed; the heated air passes through The coating test piece (8) is heated through the simulated flue (7); the second thermocouple temperature sensor (9) monitors the temperature value of the inner surface of the simulated flue (7); when the temperature reaches the set temperature value, the air intake solenoid valve (11) and the exhaust solenoid valve (18) are opened, and the seventh solenoid valve (17) is closed at the same time, and cold air is sucked in from the air intake solenoid valve (11), enters the simulated flue (7) through the sixth solenoid valve (16), cools the coating test piece (8), and is then discharged from the exhaust solenoid valve (18), so that the coating test piece (8) completes a hot and cold alternating temperature change; Common heating mode: air enters the fifth solenoid valve (15) through the outlet of the circulation fan (1), is heated by the third air heating device (5), passes through the third solenoid valve (13), and then passes through the second air heating device (4) and the first air heating device (3) in sequence; the air heated by the first air heating device (3) passes through the second solenoid valve (12) and the first solenoid valve (10) to enter the inlet of the circulation fan (1); the first thermocouple temperature sensor (2) monitors the circulation temperature, controls the power of the first heating rod (6), the second heating rod (19) and the third heating rod (20), and stabilizes the circulation temperature at 195-205°C; after the circulation temperature reaches the set temperature, the first solenoid valve (12) is turned on. The sixth solenoid valve (16) and the seventh solenoid valve (17) are opened, and the fifth solenoid valve (15) is closed; the heated air passes through the simulated flue (7) to heat the coating test piece (8); the second thermocouple temperature sensor (9) monitors the temperature value of the inner surface of the simulated flue (7), and when the set temperature value is reached, the air intake solenoid valve (11) and the exhaust solenoid valve (18) are opened, and the seventh solenoid valve (17) is closed at the same time, and cold air is sucked in from the air intake solenoid valve (11), passes through the sixth solenoid valve (16) into the simulated flue (7), cools the coating test piece (8), and is then discharged from the exhaust solenoid valve (18), so that the coating test piece (8) completes a hot and cold alternating temperature change.

9. A method for testing the temperature change resistance of flue anticorrosion coating according to claim 8, characterized in that: The single heating mode is used to test a coating test piece (8) in an applicable environment below 80°C.

10. A method for testing the temperature change resistance of flue anticorrosion coating according to claim 8, characterized in that: The common heating mode is used to test a coating test piece (8) in an applicable environment below 160°C.

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