A simulation device for studying corrosion during shutdown of a heating network system and its usage method

Abstract

This invention discloses a simulation device and its method for studying corrosion during the shutdown of a heating network system. The simulation device is designed with top, middle, and bottom sample hanging rods at different heights within a container. By suspending the sample in different environments, it can simulate material corrosion under full-water, semi-submerged, and emptied conditions during the shutdown of the heating network system. The simulation device employs a closed structure and is designed with top and bottom vent pipes to adjust the dissolved oxygen concentration in the gas and liquid phases, respectively, thus simulating different shutdown stages. This device allows for real-time observation of the corrosion condition of the sample during the shutdown corrosion simulation experiment, facilitating the analysis of the test results.

Description

Technical Field

[0001] This invention belongs to the field of material corrosion behavior research in heating pipe network systems, specifically involving a laboratory device for studying corrosion of a heating network system during shutdown and its usage method. Background Technology

[0002] Heating networks are crucial facilities for ensuring residential heating. Corrosion problems in heating network systems account for over 70% of heating network accidents, making corrosion prevention a key focus for operators. Heating network systems operate for 4-6 months annually, remaining shut down for the rest of the year, resulting in prolonged periods of corrosion. This shutdown corrosion not only damages pipelines during downtime but also affects the quality of the heating network water, leading to high turbidity during the initial startup phase. High turbidity reduces the effectiveness of scale and corrosion inhibitors and easily causes heat exchanger fouling, impacting heat exchange efficiency. Therefore, implementing proactive and effective corrosion prevention measures to mitigate downtime corrosion is essential for heating systems. However, various types of corrosion often occur during heating network downtime, and currently, there are no mature corrosion prevention solutions. Therefore, conducting relevant research in the laboratory is of significant importance.

[0003] Heating network systems are vast and influenced by complex factors, making systematic scientific research impossible. Therefore, simulating the corrosion process during heating network shutdown in a laboratory setting is more practically meaningful. During the shutdown corrosion process, three states can be identified based on the actual shutdown conditions: most areas are in a full-water maintenance state; some maintenance areas are drained and placed in an atmospheric corrosion environment; and some areas that are not completely drained are in a semi-immersed state. Currently, there are no commercially available devices or methods for simulating heating network system shutdown corrosion in a laboratory setting. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention aims to provide an apparatus and method for using it to study the corrosion of a heating network system during shutdown in a laboratory setting. This apparatus can simulate various types of shutdown corrosion in a heating network system in the laboratory, and is used for research on shutdown corrosion.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A simulation device for studying corrosion during shutdown of a heating network system includes a shutdown corrosion simulation container. The bottom of the shutdown corrosion simulation container has a heater, a bottom vent pipe, and a dissolved oxygen and temperature testing probe. The top of the shutdown corrosion simulation container has a solution inlet.

[0007] The decommissioned corrosion simulation container is also equipped with an exhaust port on the top, and an exhaust valve is installed on the exhaust port; temperature, dissolved oxygen and humidity probes are also installed on the top.

[0008] The decommissioned corrosion simulation container is equipped with a top sample hanging rod, a middle sample hanging rod, and a bottom sample hanging rod from top to bottom.

[0009] The specimens used to study the emptied state are suspended on the top hanging rod; the specimens used to study the partially immersed state are suspended on the middle hanging rod; and the specimens used to study the fully immersed state are suspended on the bottom hanging rod.

[0010] As a further improvement of the present invention, a top vent pipe is also provided on the upper side inside the decommissioned corrosion simulation container, the air inlet end of the top vent pipe extends to the outside of the decommissioned corrosion simulation container, and a first air inlet valve is provided on the air inlet end of the top vent pipe.

[0011] The decommissioned corrosion simulation container is provided with a bottom vent pipe on the lower side inside, and the air inlet end of the bottom vent pipe extends to the outside of the decommissioned corrosion simulation container. A second air inlet valve is provided on the air inlet end of the bottom vent pipe.

[0012] As a further improvement of the present invention, the top hanging rod, the middle hanging rod and the bottom hanging rod are all placed horizontally.

[0013] As a further improvement of the present invention, the probe includes a temperature probe, a dissolved oxygen probe, and a humidity probe.

[0014] As a further improvement of the present invention, the decommissioned corrosion simulation container is made entirely of stainless steel, with one side made of tempered glass to form a corrosion observation window.

[0015] As a further improvement of the present invention, a lighting device is provided on the top of the decommissioned corrosion simulation container.

[0016] As a further improvement of the present invention, the bottom of the corrosion simulation container is designed with a water outlet, and a water outlet valve is provided on the water outlet. The water outlet valve is connected to a circulating water pump, and the water outlet of the circulating water pump is connected to a drain valve.

[0017] As a further improvement of the present invention, the bottom of the corrosion simulation container is designed with a return water inlet, and a return water valve is provided on the return water inlet, which is connected to the outlet of the circulating water pump.

[0018] A method for using a simulation device to study corrosion during the shutdown of a heating network system includes the following steps:

[0019] The specimens used to study the emptied state are suspended on the top hanging rod, the specimens used to study the partially immersed state are suspended on the middle hanging rod, and the specimens used to study the fully immersed state are suspended on the bottom hanging rod.

[0020] Add simulated heating network circulating water solution through the solution inlet, turn on the heater, and heat to the target temperature; adjust the simulated heating network circulating water solution so that the sample on the top hanging rod is above the liquid surface, immerse part of the sample on the middle hanging rod in the simulated heating network circulating water solution, and keep the sample on the bottom hanging rod fully submerged in the simulated heating network solution to simulate the material corrosion during full water maintenance when the heating network system is shut down; observe the corrosion morphology of the sample in real time.

[0021] As a further improvement of the present invention, an inert gas or oxygen is introduced into the top space of the container through the top vent pipe to change the corrosiveness of the environment in which the test piece is located in the study of the vented state; nitrogen or oxygen is introduced into the simulated liquid through the bottom vent pipe to change the dissolved oxygen content in the simulated heat network liquid.

[0022] The outlet valve is opened periodically, and after passing through the circulating water pump, the water flows into two internal branches. One branch flows through the return water valve and back to the corrosion simulation container through the return water outlet; this simulates the pump start-up and circulation process during shutdown.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] This device is designed with top hanging rod, middle hanging rod and bottom hanging rod at different heights of the container to suspend the sample in different environments, which can simulate the material corrosion in the full water state, half submerged state and empty state during the shutdown of the heating network system.

[0025] Furthermore, the simulation device of the present invention adopts a closed structure and is designed with a top vent pipe and a bottom vent pipe to adjust the concentration of dissolved oxygen in the gas phase and liquid phase respectively, thereby simulating different shutdown stages.

[0026] Furthermore, the device features an observation port made of tempered glass on the side and is equipped with an auxiliary lighting device, which allows for real-time observation of the corrosion status of the test specimens during the shutdown corrosion simulation test, facilitating the analysis of test results. Attached Figure Description

[0027] Figure 1 This is a front view of a simulation device for studying corrosion during shutdown of a heating network system according to the present invention;

[0028] Figure 2 This is a left view of a simulation device for studying corrosion during shutdown of a heating network system according to the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0030] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, a laboratory apparatus for studying corrosion during shutdown of a heating network system includes a shutdown corrosion simulation container 19. The container 19 has a heater 6, a bottom vent pipe 20, and dissolved oxygen and temperature testing probes 7 at its bottom. The top of the container 19 has a solution inlet 10 for adding a simulated heating network solution. The top of the container 19 also has an exhaust port 9 with an exhaust valve 21 for venting gas from the container. Temperature, dissolved oxygen, and humidity probes 8 are also installed at the top. From top to bottom, the container 19 has a top sample hanging rod 1, a middle sample hanging rod 2, and a bottom sample hanging rod 3, all placed horizontally. A sample 11 for studying the emptied state is suspended on the top sample hanging rod 1. A sample 12 for studying the partially immersed state is suspended on the middle sample hanging rod 2. A sample for studying the fully immersed state is suspended on the bottom sample hanging rod 3.

[0032] This simulation device features top, middle, and bottom sample hanging rods at different heights within the container, suspending the sample in various environments to simulate material corrosion during the shutdown of a heating network system under full water, semi-submerged, and emptied conditions. The device employs a closed structure and includes top and bottom vent pipes to adjust the dissolved oxygen concentrations in the gas and liquid phases, respectively, thus simulating different shutdown stages. The device has tempered glass observation ports on the sides and is equipped with auxiliary lighting, allowing real-time observation of the sample's corrosion during the shutdown corrosion simulation test, facilitating result analysis.

[0033] Preferably, a top vent pipe 26 is provided on the upper side inside the deactivated corrosion simulation container 19, with the air inlet end of the top vent pipe 26 extending to the outside of the deactivated corrosion simulation container 19, and a first air inlet valve 5 is provided on the air inlet end of the top vent pipe 26; a bottom vent pipe 20 is provided on the lower side inside the deactivated corrosion simulation container 19, with the air inlet end of the bottom vent pipe 20 extending to the outside of the deactivated corrosion simulation container 19, and a second air inlet valve 4 is provided on the air inlet end of the bottom vent pipe 20.

[0034] Inert gas or oxygen can be introduced into the top space of the container through the top vent pipe 26 to change the corrosiveness of the environment in which the test piece 11 is located under venting conditions. Nitrogen or oxygen can be introduced into the simulated liquid through the bottom vent pipe 20 to change the dissolved oxygen content in the simulated heating network liquid.

[0035] Among them, the decommissioned corrosion simulation container 19 is made of 316L stainless steel, and one side is made of tempered glass, which serves as the corrosion observation window 22.

[0036] As a preferred option, the top of the corrosion simulation container 19 is equipped with a lighting device 23 to enhance the lighting when observing the corrosion test piece.

[0037] The corrosion simulation container 19 is designed with an outlet 24 at the bottom. The corrosion simulation liquid can flow out of the simulation container through the outlet 23, pass through the outlet valve 15, and after passing through the circulating water pump 16, it splits into two branches. One branch flows through the return water valve 17 and returns to the corrosion simulation container through the return water outlet 25. The other branch flows through the drain valve 18 and can be discharged from the system.

[0038] This invention also provides a method for using an apparatus for laboratory research on corrosion during shutdown of a heating network system, comprising the following steps:

[0039] The specimen 11, used to study the emptied state, is suspended on the top hanging rod 1; the specimen 12, used to study the semi-immersed state, is suspended on the middle hanging rod 2; and the specimen 12, used to study the fully immersed state, is suspended on the bottom hanging rod 3. Simulated heating network circulating water solution is added through the solution inlet 10. This solution can be taken from the heating network circulating water or prepared according to indicators such as hardness, pH, chloride ion concentration, and sulfate ion concentration. The heater 6 is turned on and heated to the target temperature. After opening the outlet valve 15, the circulating water pump 16, and the drain valve 18, some of the simulated heating network solution can be discharged from the corrosion simulation container 19, so that the specimen on the top hanging rod 1 is above the liquid surface. At this time, the specimen suspended on the top hanging rod 1 can simulate the corrosion of materials when the pipeline water is drained during the shutdown of the heating network system.

[0040] Continuing to discharge some circulating water through circulating water pump 16, the sample piece on the middle hanging rod 2 is partially immersed in the simulated circulating water solution of the heating network, which can simulate the corrosion of materials when the pipeline water is partially drained during the shutdown of the heating network system. During the test, the sample piece suspended on the bottom hanging rod 3 is always immersed in the simulated heating network solution, which can simulate the corrosion of materials during the full water maintenance during the shutdown of the heating network system.

[0041] Inert gas or oxygen can be introduced into the top space of the container through the top vent pipe 26 to change the corrosiveness of the environment in which the test piece 11 is located under venting conditions. Nitrogen or oxygen can be introduced into the simulated liquid through the bottom vent pipe 20 to change the dissolved oxygen content in the simulated heating network liquid.

[0042] The outlet valve 15 can be opened periodically, and after passing through the circulating water pump 16, the water splits into two branches. One branch flows through the return water valve 17 and back to the corrosion simulation container via the return water inlet 25. This simulates the pump start-up and circulation process during shutdown. During the test, the corrosion morphology of the specimen can be observed in real time through the observation window 22. The lighting device 23 can be turned on during the observation process to increase lighting.

[0043] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of using a simulated device for studying deactivation corrosion in a heating network system, characterized in that, The simulation device comprises a deactivation corrosion simulation container (19), a heater (6) at the bottom of the deactivation corrosion simulation container (19), an air inlet pipe (20) at the bottom, a dissolved oxygen and temperature testing probe (7); a solution adding port (10) at the top of the deactivation corrosion simulation container (19); An air outlet (9) is further arranged at the top of the deactivation corrosion simulation container (19), and an air outlet valve (21) is arranged on the air outlet (9); a temperature, dissolved oxygen and humidity probe is further arranged at the top; The deactivation corrosion simulation container (19) is sequentially provided with a top sample hanging rod (1), a middle sample hanging rod (2) and a bottom sample hanging rod (3) from top to bottom; A test piece (11) for studying the emptying state is hung on the top sample hanging rod (1); a test piece (12) for studying the half-immersed state is hung on the middle sample hanging rod (2); and a test piece for studying the fully immersed state is hung on the bottom sample hanging rod (3); The inside of the deactivation corrosion simulation container (19) is further provided with a top air inlet pipe (26), and the air inlet end of the top air inlet pipe (26) extends to the outside of the deactivation corrosion simulation container (19); a first air inlet valve (5) is arranged on the air inlet end of the top air inlet pipe (26); The inside of the deactivation corrosion simulation container (19) is further provided with a bottom air inlet pipe (20), and the air inlet end of the bottom air inlet pipe (20) extends to the outside of the deactivation corrosion simulation container (19); a second air inlet valve (4) is arranged on the air inlet end of the bottom air inlet pipe (20); The top sample hanging rod (1), the middle sample hanging rod (2) and the bottom sample hanging rod (3) are all horizontally placed; The probe (8) comprises a temperature probe, a dissolved oxygen probe and a humidity probe; The use method of the simulation device for studying the deactivation corrosion of the heat supply network system comprises the following steps: A test piece (11) for studying the emptying state is hung on the top sample hanging rod (1); a test piece (12) for studying the half-immersed state is hung on the middle sample hanging rod (2); and a test piece for studying the fully immersed state is hung on the bottom sample hanging rod (3); The heat supply network circulating water simulation liquid is added through the solution adding port (10), the heater (6) is turned on, and the temperature is heated to the target temperature; the heat supply network circulating water simulation liquid is adjusted so that the test piece on the top sample hanging rod (1) is above the liquid level, the test piece on the middle sample hanging rod (2) is partially immersed in the heat supply network circulating water simulation liquid, and the test piece hung on the bottom sample hanging rod (3) is always immersed in the heat supply network simulation liquid, thereby simulating the material corrosion condition during the full water maintenance in the deactivation process of the heat supply network system; and the corrosion morphology of the test piece is observed in real time; Inert gas or oxygen is introduced into the top space of the container through the top air inlet pipe (26), so as to change the corrosiveness of the environment of the test piece (11) in the emptying state; nitrogen or oxygen is introduced into the simulation liquid through the bottom air inlet pipe (20), so as to change the dissolved oxygen content in the heat supply network simulation liquid; The water outlet valve (15) is opened regularly, and after the circulating water pump (16), the water is divided into two branches, one branch flows through the backwater valve (17) and flows back to the corrosion simulation container through the backwater port (25); the pump circulation process during the deactivation period is simulated.

2. A method of using a simulated device for studying deactivation corrosion in a heating network system according to claim 1, characterized in that: The whole of the inactivity corrosion simulation container (19) is made of stainless steel, and one side is made of tempered glass to form a corrosion observation window (22).

3. The method of using a simulated device for studying thermal system shutdown corrosion according to claim 1, wherein: The inactivity corrosion simulation container (19) is provided with an illumination device (23) on the top.

4. The method of using a simulated device for studying thermal system shutdown corrosion according to claim 1, wherein: The inactivity corrosion simulation container (19) is designed with a water outlet (24) on the bottom, and the water outlet (24) is provided with a water outlet valve (15) in communication with a circulating water pump (16), and the water outlet of the circulating water pump (16) is connected with a drain valve (18).

5. The method of using a simulated device for studying thermal system shutdown corrosion according to claim 1, wherein: The inactivity corrosion simulation container (19) is designed with a water return port (25) on the bottom, and the water return port (25) is provided with a water return valve (17) in communication with the water outlet of the circulating water pump (16).

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