Corrosion simulation test device for outer wall of heat supply pipe network and use method thereof

Abstract

The application discloses a kind of heat supply pipe network outer wall corrosion simulation test device and its using method, the device includes corrosion simulation container;The corrosion simulation container is transversely provided with tube heater;Tube heater is separately provided with top sample hanging rod and bottom sample hanging rod above and below;Top sample hanging rod and bottom sample hanging rod are used to hang corrosion test piece, top sample hanging rod is electrically connected with top sample hanging rod temperature control device being arranged outside corrosion simulation container;Bottom sample hanging rod is electrically connected with bottom sample hanging rod temperature control device being arranged outside corrosion simulation container;Top sample hanging rod is provided with top liquid feeding pipeline above, and bottom sample hanging rod is provided with bottom liquid feeding pipe below;Top liquid feeding pipeline and bottom liquid feeding pipe surface are evenly distributed with hole.Therefore the device can be more accurate in laboratory simulation heat supply pipe network outer wall corrosion, for heat supply buried pipeline outer corrosion research work.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of material corrosion research in heat supply pipe network system, and particularly relates to a heat supply pipe network outer wall corrosion simulation test device and a use method thereof. BACKGROUND

[0002] Centralized heat supply can provide stable and reliable heat source for cities, improve people's life, save energy and reduce urban pollution, and has significant economic and social benefits. Heat supply pipe network is an important facility for guaranteeing centralized heat supply for residents. With the continuous expansion of centralized heat supply, the heat transfer distance of heat supply pipe network is continuously increasing, and the geological working conditions of pipe crossing are more complex and diverse, so the pipe is facing more severe risks of soil corrosion and groundwater corrosion. According to statistics, the corrosion problem of heat supply pipe network system accounts for more than 70% of heat network accidents, so the anti-corrosion problem of heat supply pipe network has been one of the focuses of the operation personnel.

[0003] The outer protective layer of the heat supply pipe network is composed of a polyurethane insulation layer, a waterproof layer and an anti-corrosion layer. Generally, the outer protective layer of the whole heat supply pipe network is prefabricated and is not easy to be damaged, and has good corrosion protection effect. However, the outer protective layer at the pipe joint is made on the construction site and is relatively easy to be damaged. After the outer waterproof layer of the pipe is damaged, the groundwater near the pipe can penetrate into the insulation layer. The polyurethane insulation layer carbonizes after being contacted with water, loses the insulation effect, and the groundwater heated by the pipe becomes steam, which further damages the insulation layer. At this time, steam will come out of the soil above the pipe and form a steam emission point. During the operation of the heat supply pipe network, the pipe temperature is high, and the groundwater continuously evaporates on the surface of the pipe, which may form deposited salt near the pipe. The heat network system is operated for 4-6 months every year, and the rest of the time is in a shutdown state. During the shutdown of the heat network, the pipe temperature decreases, and the pipe is immersed in groundwater. These factors make the outer wall of the buried heat supply pipe network have a high risk of soil corrosion. In addition, the valves in the heat supply pipe network are generally arranged in valve wells, and the pipes in the valve wells have no outer insulation layer. Due to the infiltration of groundwater, the water in some valve wells is serious, and the pipe section in the valve well also has a high corrosion risk.

[0004] Since the heat supply pipe network is covered with soil, its corrosion rate and corrosion condition are difficult to monitor in the field; site test needs earth excavation, and cannot carry out systematic scientific research. Once the outer wall of the heat supply pipe network corrodes and leaks, not only the heat source will be lost, but also scalding accidents may occur. The soil corrosion environment and the groundwater quality of the heat supply pipe network are different, so it is more practical to build a simulation device for experimental research according to the corrosion characteristics of the buried heat supply pipe network in the laboratory. The buried heat supply pipe network system is large, and the pipe outside involves two working conditions of soil corrosion and valve well corrosion, and the influencing factors are complex. The conventional laboratory simulation experiment cannot simulate the actual characteristics of this environment. At present, there is no simulation device and use method for the outer wall corrosion of the heat supply pipe network on the market. SUMMARY

[0005] In order to solve the above problems existing in the prior art, the purpose of the present application is to provide a heating pipe network outer wall corrosion simulation test device and a use method thereof. The device can simulate the corrosion condition of the outer wall of the heating pipe network in the laboratory, and is used for the outer corrosion research work of the buried heating pipeline.

[0006] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0007] A heating pipe network outer wall corrosion simulation test device, comprising a corrosion simulation container;

[0008] A pipe-mounted heater is horizontally arranged in the corrosion simulation container; a top sample hanging rod and a bottom sample hanging rod are respectively arranged above and below the pipe-mounted heater; the top sample hanging rod and the bottom sample hanging rod are used for suspending corrosion test pieces, the top sample hanging rod is electrically connected with a top sample hanging rod temperature control device arranged outside the corrosion simulation container; and the bottom sample hanging rod is electrically connected with a bottom sample hanging rod temperature control device arranged outside the corrosion simulation container.

[0009] A top liquid adding pipeline is arranged above the top sample hanging rod, and a bottom liquid adding pipe is arranged below the bottom sample hanging rod; the surfaces of the top liquid adding pipeline and the bottom liquid adding pipe are uniformly distributed with holes.

[0010] As a further improvement of the present application, the pipe-mounted heater is electrically connected with a heating temperature arranged outside the corrosion simulation container through a temperature controller.

[0011] As a further improvement of the present application, the bottom liquid adding pipe is connected with a bottom liquid adding pump, and a bottom liquid adding valve is arranged between the bottom liquid adding pump and the bottom liquid adding pipe.

[0012] The top liquid adding pipeline is connected with a top liquid adding pump, and a top liquid adding valve is arranged between the top liquid adding pump and the top liquid adding pipeline.

[0013] As a further improvement of the present application, the top liquid adding pump and the bottom liquid adding pump are connected with a test solution storage tank through pipelines, and the test solution storage tank stores a test solution; the test solution is underground water or underground water simulation liquid near a test target pipeline.

[0014] As a further improvement of the present application, the top sample hanging rod is connected with the corrosion simulation container through a first fixing flange;

[0015] The bottom sample hanging rod is connected with the corrosion simulation container through a second fixing flange;

[0016] The first fixing flange and the second fixing flange are arranged on the side wall of the corrosion simulation container.

[0017] As a further improvement of the present application, a first test probe is arranged above the first fixed flange, and a second test probe is arranged below the second fixed flange.

[0018] As a further improvement of the present application, a drainage pipe is arranged at the bottom of the corrosion simulation container, and a drainage valve is arranged on the drainage pipe; a liquid level sensor is arranged in the middle of the corrosion simulation container.

[0019] As a further improvement of the present application, a soil discharge device is arranged at the bottom of the corrosion simulation container.

[0020] A method for using a heat supply pipe network outer wall corrosion simulation test device, including a pipe soil corrosion simulation test method; the pipe soil corrosion simulation test method includes:

[0021] The corrosion test pieces are hung on the top and bottom sample hanging rods, the soil samples near the test target pipe are evenly spread in the corrosion simulation container, and the corrosion simulation container is filled; the temperature of the pipe-mounted heater is set, and the temperature of the top and bottom sample hanging rods is controlled through the top and bottom sample hanging rod temperature control devices;

[0022] After the temperature is stabilized, the test solution is added to the corrosion simulation container through the top and bottom liquid adding pipes, and the temperature, humidity and soil resistivity in the test environment are monitored in real time;

[0023] After the test is completed, the top and bottom sample hanging rods are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated.

[0024] A method for using a heat supply pipe network outer wall corrosion simulation test device, including a valve well pipe corrosion simulation test method; the valve well pipe corrosion simulation test method includes:

[0025] The corrosion test pieces are hung on the top and bottom sample hanging rods; the temperature of the pipe-mounted heater is set, and the temperature of the top and bottom sample hanging rods is controlled through the top and bottom sample hanging rod temperature control devices;

[0026] After the temperature controller is stabilized, the test solution is added to the corrosion simulation container through the top and bottom liquid adding pipes, and when the liquid level reaches the set height, the simulation liquid is stopped; the temperature in the test environment is monitored in real time during the test process;

[0027] After the test is completed, the top and bottom sample hanging rods are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated.

[0028] Compared with the prior art, the present application has the following advantages:

[0029] The device of the present application simulates the soil corrosion behavior of the buried pipeline by adding the soil near the pipeline into the container; the underground water near the pipeline can also be added alone to simulate the corrosion behavior of the pipeline in the valve well, the sample hanging rod is connected with a temperature control device, the sample can be heated during the sample hanging process, the temperature of the sample is controlled to simulate the corrosion behavior under high temperature conditions during the operation of the heat supply pipeline network. In addition, a pipe heater is arranged in the middle of the simulator, which can heat the corrosion medium, control the temperature or form steam to simulate different corrosion types of the heat supply pipeline network. Through the opening at the bottom of the simulation device, the two corrosion simulation media can be conveniently switched. The top liquid adding pipe and the bottom liquid adding pipe can simulate the underground water or underground water simulation liquid near the target pipeline. Therefore, the device can accurately simulate the corrosion of the outer wall of the heat supply pipeline network in the laboratory, and is used for the research of the outer corrosion of the buried pipeline of the heat supply pipeline network.

[0030] Further, the device simulates the corrosion of the buried pipeline in the container, and the sample hanging rod is arranged in two heights, which can simulate the corrosion of the steam section and the water accumulation section of the buried pipeline, respectively. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a front view of the heat supply pipeline network buried pipeline corrosion simulation test device of the present application.

[0032] Figure 2 It is a left view of the heat supply pipeline network buried pipeline corrosion simulation test device of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0034] Embodiment 1

[0035] As shown in Figure 1 and Figure 2 , the first object of the present application is to provide a simulation test device for laboratory research on the corrosion of the buried heat supply pipeline network,

[0036] including a corrosion simulation container 21;

[0037] The pipe heater 5 is arranged transversely in the corrosion simulation container 21; the pipe heater 5 is electrically connected with the heating temperature arranged outside the corrosion simulation container 21 through the temperature controller 6.

[0038] The tube heater 5 is provided with a top sample hanging rod 3 and a bottom sample hanging rod 4 respectively at the top and bottom of the tube heater 5; the top sample hanging rod 3 and the bottom sample hanging rod 4 are used for hanging corrosion test pieces, the top sample hanging rod 3 is electrically connected with a top sample hanging rod temperature control device 19 arranged outside the corrosion simulation container 21; the bottom sample hanging rod 4 is electrically connected with a bottom sample hanging rod temperature control device 20 arranged outside the corrosion simulation container 21;

[0039] The top of the top sample hanging rod 3 is provided with a top liquid adding pipeline 8, and the bottom of the bottom sample hanging rod 4 is provided with a bottom liquid adding pipeline 7; the surfaces of the top liquid adding pipeline 8 and the bottom liquid adding pipeline 7 are uniformly provided with holes.

[0040] The bottom liquid adding pipeline 7 is connected with a bottom liquid adding pump 12, and a bottom liquid adding valve 10 is arranged between the bottom liquid adding pump 12 and the bottom liquid adding pipeline 7; the top liquid adding pipeline 8 is connected with a top liquid adding pump 11, and a top liquid adding valve 9 is arranged between the top liquid adding pump 11 and the top liquid adding pipeline 8. The top liquid adding pump 11 and the bottom liquid adding pump 12 are connected with a test solution storage tank 13 through pipelines, and the test solution storage tank 13 stores a test solution 16; the test solution 16 is underground water or underground water simulation liquid near a test target pipeline.

[0041] The corrosion simulation container 21 is provided with a soil discharging device 24 at the bottom, and solid substances in the corrosion simulation container 21 can be discharged.

[0042] The sample hanging rod of the present application is connected with a temperature control device, the test pieces can be heated during the sample hanging process, the temperature of the test pieces is controlled, and the corrosion behavior under high temperature conditions in the operation process of the heat supply pipeline network is simulated. In addition, a tube heater is arranged in the middle of the simulator, the corrosion medium can be heated, the temperature is controlled or steam is formed, and different corrosion types of the heat supply pipeline network are simulated. Through the opening at the bottom of the simulation device, the two kinds of corrosion simulation media can be conveniently switched. The top liquid adding pipeline and the bottom liquid adding pipeline can simulate the underground water or underground water simulation liquid near the test target pipeline.

[0043] In order to fix the sample hanging rod, a flange is used, the top sample hanging rod 3 is connected with the corrosion simulation container 21 through a first fixing flange 1; the bottom sample hanging rod 4 is connected with the corrosion simulation container 21 through a second fixing flange 2; the first fixing flange 1 and the second fixing flange 2 are arranged on the side wall of the corrosion simulation container 21.

[0044] Some test sensors are further included, a first test probe 14 is arranged above the first fixing flange 1, and a second test probe 15 is arranged below the second fixing flange 2. The corrosion simulation container 21 is provided with a liquid discharging pipeline 25 at the bottom, and a water valve 22 is arranged on the liquid discharging pipeline 25; a liquid level sensor 23 is arranged in the middle of the corrosion simulation container 21.

[0045] Specifically, the device comprises a corrosion simulation container 21, a tube heater 5 is arranged in the middle of the corrosion simulation container 21; the heating temperature of the tube heater 5 is controlled by a temperature controller 6, and the temperature can be controlled within ±1℃. The bottom of the corrosion simulation container 21 is provided with a bottom liquid adding pipe 7, and the surface of the bottom liquid adding pipe 7 is uniformly provided with holes for adding test solution from the bottom of the simulation container. The bottom liquid adding pipe 7 is connected with a bottom liquid adding pump 12, and a bottom liquid adding valve 10 is arranged between the bottom liquid adding pipe 7 and the bottom liquid adding pump 12.

[0046] The top of the corrosion simulation container 21 is provided with a top liquid adding pipe 8, and the surface of the top liquid adding pipe 8 is uniformly provided with holes for adding test solution from the top of the simulation container. The top liquid adding pipe 8 is connected with a top liquid adding pump 11, and a top liquid adding valve 9 is arranged between the top liquid adding pipe 8 and the top liquid adding pump 11. The top liquid adding pump 11 and the bottom liquid adding pump 12 are both connected with a test solution storage tank 13 through pipes, and the test solution storage tank 13 stores test solution 16. The test solution 16 is underground water or underground water simulation liquid near the target pipeline.

[0047] The top of the corrosion simulation container 21 is provided with a top liquid adding pipe 8, and the surface of the top liquid adding pipe 8 is uniformly provided with holes for adding test solution from the top of the simulation container. The top liquid adding pipe 8 is connected with a top liquid adding pump 11, and a top liquid adding valve 9 is arranged between the top liquid adding pipe 8 and the top liquid adding pump 11. The top liquid adding pump 11 and the bottom liquid adding pump 12 are both connected with a test solution storage tank 13 through pipes, and the test solution storage tank 13 stores test solution 16. The test solution 16 is underground water or underground water simulation liquid near the target pipeline.

[0048] The device can add soil near the pipeline in the simulation container to simulate the soil corrosion behavior of the buried pipeline; or can separately add underground water near the pipeline to simulate the corrosion behavior of the valve well pipeline. Through the bottom opening of the simulation device, the two kinds of corrosion simulation media can be conveniently switched. The simulation container of the device is provided with two kinds of sample hanging rods with different heights, which can simulate the corrosion conditions of the steam section and the water accumulation section of the buried pipeline, respectively.

[0049] As shown in Figure 2 The first test probe 14 is arranged above the first fixed flange 1, and the second test probe 15 is arranged below the second fixed flange 2, which can measure the temperature, humidity and soil resistivity data in the soil environment. The corrosion simulation container 21 is provided with a drainage pipe 25, and the drainage pipe is provided with a drainage valve 22. The corrosion simulation container 21 is provided with a soil discharge device 24. The corrosion simulation container 21 is provided with a liquid level sensor 23.

[0050] The temperature control device is connected with the sample hanging rod, the sample can be heated during the sample hanging process, the temperature of the sample is controlled, and the corrosion behavior under the high-temperature condition in the operation process of the heat supply pipe network is simulated. In addition, a heating pipe is arranged in the middle of the simulator, the corrosion medium can be heated, the temperature is controlled or steam is formed, and different corrosion types of the heat supply pipe network are simulated.

[0051] Embodiment 2

[0052] A second object of the present application is to provide a use method of the heat supply pipe network buried pipeline corrosion simulation test device, which comprises the following steps:

[0053] The device has two test modes: a pipeline soil corrosion simulation test method and a valve well pipeline corrosion simulation test method.

[0054] The pipeline soil corrosion simulation test method comprises the following steps:

[0055] The corrosion test pieces are hung on the top sample hanging rod 3 and the bottom sample hanging rod 4, the soil sample near the target pipeline is uniformly spread in the corrosion simulation container 21, and the corrosion simulation container 21 is filled; the temperature of the pipe-mounted heater 5 is set, and the temperature of the top sample hanging rod 3 and the bottom sample hanging rod 4 is controlled through the top sample hanging rod temperature control device 19 and the bottom sample hanging rod temperature control device 20.

[0056] After the temperature is stabilized, the test solution 16 is added to the corrosion simulation container 21 through the top liquid adding pipeline 8 and the bottom liquid adding pipeline 7, and the temperature, humidity and soil resistivity in the test environment are monitored in real time.

[0057] After the test is completed, the top sample hanging rod 3 and the bottom sample hanging rod 4 are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated.

[0058] The valve well pipeline corrosion simulation test method comprises the following steps:

[0059] The corrosion test pieces are hung on the top sample hanging rod 3 and the bottom sample hanging rod 4; the temperature of the pipe-mounted heater 5 is set, and the temperature of the top sample hanging rod and the bottom sample hanging rod is controlled through the top sample hanging rod temperature control device 19 and the bottom sample hanging rod temperature control device 20.

[0060] After the temperature controller is stabilized, the test solution 16 is added to the corrosion simulation container 21 through the top liquid adding pipeline 8 and the bottom liquid adding pipeline 7, and when the liquid level reaches the set height, the simulation liquid is stopped; the temperature in the test environment is monitored in real time during the test process.

[0061] After the test is completed, the top sample hanging rod 3 and the bottom sample hanging rod 4 are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated.

[0062] The following will be described in detail.

[0063] In the study of the soil corrosion of buried pipelines, corrosion test pieces are first hung on the top sample hanging rod 3 and the bottom sample hanging rod 4, the sample hanging rods are placed in the corrosion simulation container 21, and the first fixing flange 1 and the second fixing flange 2 are tightened. The soil samples near the test target pipeline are evenly spread in the corrosion simulation container 21, and the corrosion simulation container 21 is filled with soil. The total amount of soil filled can refer to the soil density measured during the on-site soil taking process. The underground water or underground water simulation liquid near the test target pipeline is added to the test solution storage tank 13. The temperature of the tube heater 5 is set by the temperature controller 6, and the temperature of the top sample hanging rod and the bottom sample hanging rod is controlled by the top sample hanging rod temperature control device 19 and the bottom sample hanging rod temperature control device 20. After the temperature of the temperature controller stabilizes, the top liquid adding valve 9 and the bottom liquid adding valve 10 are opened, and the test solution 16 is added to the corrosion simulation container 21 through the top liquid adding pump 11 and the bottom liquid adding pump 12. During the simulation test process, the temperature, humidity and soil resistivity in the test environment can be monitored in real time through the first test probe 14 and the second test probe 15. After the test is completed, the soil discharge device is opened, and if necessary, the test solution can be added through the top liquid adding pipeline 8 and the bottom liquid adding pipeline 7 to facilitate soil discharge. The top sample hanging rod 3 and the bottom sample hanging rod 4 are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated. In the accelerated test, the concentration of corrosion factors in the test solution 16 can be adjusted, such as increasing the concentration of chloride ions in proportion.

[0064] In the study of the corrosion of buried pipelines in valve wells, corrosion test pieces are first hung on the top sample hanging rod 3 and the bottom sample hanging rod 4, the sample hanging rods are placed in the corrosion simulation container 21, and the first fixing flange 1 and the second fixing flange 2 are tightened. The underground water or underground water simulation liquid near the test target pipeline is added to the test solution storage tank 13. The temperature of the tube heater 5 is set by the temperature controller 6, and the temperature of the top sample hanging rod and the bottom sample hanging rod is controlled by the top sample hanging rod temperature control device 19 and the bottom sample hanging rod temperature control device 20. After the temperature of the temperature controller stabilizes, the bottom liquid adding valve 10 is opened, and the test solution 16 is added to the corrosion simulation container 21 by the bottom liquid adding pump 12. The liquid level of the solution during the test process is measured by the liquid level sensor 23, and when the liquid level is higher than the upper limit of the liquid level sensor, the addition of the simulation liquid is stopped. During the simulation test process, the temperature in the test environment can be monitored in real time through the first test probe 14 and the second test probe 15. After the test is completed, the drain pipe 25 is opened to drain the solution in the corrosion simulation container 21. The top sample hanging rod 3 and the bottom sample hanging rod 4 are taken out, and the corrosion morphology and corrosion rate of the test pieces are calculated.

[0065] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed by the present application, which can be easily thought by those skilled in the art, should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A simulation test device for corrosion of the outer wall of a heating pipe network, characterized in that, Including corrosion simulation containers (21); A tubular heater (5) is horizontally arranged inside the corrosion simulation container (21); a top sample hanging rod (3) and a bottom sample hanging rod (4) are respectively arranged above and below the tubular heater (5); the top sample hanging rod (3) and the bottom sample hanging rod (4) are used to suspend corrosion test pieces; the top sample hanging rod (3) is electrically connected to the top sample hanging rod temperature control device (19) set outside the corrosion simulation container (21); the bottom sample hanging rod (4) is electrically connected to the bottom sample hanging rod temperature control device (20) set outside the corrosion simulation container (21); A top liquid addition pipe (8) is provided above the top sample hanging rod (3), and a bottom liquid addition pipe (7) is provided below the bottom sample hanging rod (4); the top liquid addition pipe (8) and the bottom liquid addition pipe (7) have holes evenly distributed on their surfaces; The bottom liquid filling pipe (7) is connected to the bottom liquid filling pump (12), and a bottom liquid filling valve (10) is provided between the bottom liquid filling pump (12) and the bottom liquid filling pipe (7). The top liquid filling pipe (8) is connected to the top liquid filling pump (11), and a top liquid filling valve (9) is provided between the top liquid filling pump (11) and the top liquid filling pipe (8). The top liquid pump (11) and the bottom liquid pump (12) are connected to the test solution storage tank (13) through pipes. The test solution storage tank (13) stores the test solution (16). The test solution (16) is groundwater or groundwater simulation liquid near the test target pipeline. The top sample hanging rod (3) is connected to the corrosion simulation container (21) through the first fixed flange (1); The bottom sample hanging rod (4) is connected to the corrosion simulation container (21) through the second fixed flange (2); The first fixed flange (1) and the second fixed flange (2) are both installed on the side wall of the corrosion simulation container (21); A first test probe (14) is provided above the first fixed flange (1), and a second test probe (15) is provided below the second fixed flange (2). The corrosion simulation container (21) is provided with a drain pipe (25) at the bottom, and a drain valve (22) is installed on the drain pipe (25); a liquid level sensor (23) is installed in the middle of the corrosion simulation container (21).

2. The heating pipe network external wall corrosion simulation test device according to claim 1, characterized in that, The tubular heater (5) is electrically connected to the heating temperature located outside the corrosion simulation container (21) via a temperature controller (6).

3. The heating pipe network external wall corrosion simulation test device according to claim 1, characterized in that: The corrosion simulation container (21) is equipped with a soil discharge device (24) at the bottom.

4. The method of using the heating pipe network external wall corrosion simulation test device according to any one of claims 1 to 3, characterized in that, This includes methods for simulating pipeline soil corrosion; these methods include: Corrosion test pieces are suspended on the top hanging rod (3) and the bottom hanging rod (4). Soil samples near the test target pipeline are evenly spread in the corrosion simulation container (21) to fill the corrosion simulation container (21). The temperature of the pipe heater (5) is set and the temperature of the top hanging rod (3) and the bottom hanging rod (4) is controlled by the temperature control device (19) of the top hanging rod and the temperature control device (20) of the bottom hanging rod. After the temperature stabilizes, the test solution (16) is added to the corrosion simulation container (21) through the top liquid addition pipe (8) and the bottom liquid addition pipe (7), and the temperature, humidity and soil resistivity in the test environment are monitored in real time. After the test, the top hanging rod (3) and the bottom hanging rod (4) were removed, and the corrosion morphology and corrosion rate of the specimen were calculated.

5. The method of using the heating pipe network external wall corrosion simulation test device according to any one of claims 1 to 3, characterized in that, This includes methods for simulating corrosion in valve wells and pipelines; these methods include: Corrosion test pieces are suspended on the top hanging rod (3) and the bottom hanging rod (4); the temperature of the tube heater (5) is set, and the temperature of the top hanging rod and the bottom hanging rod is controlled by the top hanging rod temperature control device (19) and the bottom hanging rod temperature control device (20); After the temperature controller temperature stabilizes, the test solution (16) is added to the corrosion simulation container (21) through the top liquid addition pipe (8) and the bottom liquid addition pipe (7). When the liquid level reaches the set height, the addition of the simulation liquid is stopped. The temperature in the test environment is monitored in real time during the test. After the test, the top hanging rod (3) and the bottom hanging rod (4) were removed, and the corrosion morphology and corrosion rate of the specimen were calculated.

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