Large drainage pipe culvert corrosion condition real-time monitoring device

Abstract

The invention discloses a large drainage pipe culvert corrosion condition real-time monitoring device in the technical field of pipeline corrosion prevention, and the device comprises a water taking assembly, one end of the water taking assembly is communicated with a corrosion monitoring assembly through a pipeline, and the water taking assembly is used for pumping sewage in a large drainage pipe culvert and conveying the sewage to the corrosion monitoring assembly; one end of the corrosion monitoring assembly is in pipeline connection with the gas generation assembly, and the corrosion monitoring assembly comprises a soaking cavity and a test structure mounted in the soaking cavity. According to the method, it can be guaranteed that the flow state of sewage in the corrosion monitoring assembly is kept consistent with that of a pipeline in the newly-built or spray-repaired large drainage pipe culvert, meanwhile, after the newly-built or spray-repaired large drainage pipe culvert is put into operation, water cut-off detection is not needed, the detection flexibility of the large drainage pipe culvert is improved, and the detection efficiency is improved. By collecting and simulating the corrosion condition in the large drainage pipe culvert in real time, the corrosion condition in the pipeline can be observed in real time, and the difficulty of applying countermeasures to the corrosion mechanism of the large drainage pipe culvert is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline anti-corrosion, in particular to a real-time monitoring device for the corrosion condition of a large-scale drainage culvert. Background Art

[0002] Large-scale drainage culverts serve as the main underground drainage channel of the urban drainage system and play an irreplaceable role in ensuring the timely discharge of urban rainwater, sewage and wastewater. Usually, the inner diameter of large-scale drainage culverts is greater than 1.5 meters or the cross-sectional area is greater than 1.766 square meters. During the use of large-scale drainage culverts, they often have the characteristics of large flow rate fluctuations and a large amount of debris in the culverts. Microorganisms are easy to multiply in large numbers and produce corrosive gases. During long-term use, the interior of large-scale drainage culverts is prone to water leakage due to corrosion of the inner wall. Therefore, monitoring the corrosion condition of the inner wall of large-scale drainage culverts is extremely important for the safe discharge of water.

[0003] Traditional corrosion monitoring devices are mostly limited to simulation tests in the laboratory. Both the water pollutant concentration and the gas environment are different from the actual corrosion environment. It is difficult to accurately evaluate the corrosion resistance of pipeline materials, and it is even more difficult to explore the corrosion process of large drainage culverts under the coupling of multiple factors. On the other hand, after the newly built or spray-repaired large drainage culverts are put into operation, water outage detection is often required for on-site inspection. However, large drainage culverts are main pipes and are usually difficult to stop water for inspection, resulting in the inability to effectively observe the internal corrosion of the pipeline, making it more difficult to take countermeasures against the corrosion mechanism of large drainage culverts, which is not conducive to controlling the generation of corrosive substances in large drainage culverts and it is difficult to improve the corrosion resistance of the drainage system. Summary of the invention

[0004] The purpose of the present invention is to provide a real-time monitoring device for the corrosion condition of a large drainage culvert. After a newly built or spray-repaired large drainage culvert is put into operation, there is no need to stop water for detection, which greatly improves the flexibility of large drainage culvert detection. By real-time collection and simulation of the corrosion conditions in the large drainage culvert, the internal corrosion conditions of the pipeline can be observed in real time, reducing the difficulty of applying countermeasures to the corrosion mechanism of the large drainage culvert, which is conducive to controlling the generation of corrosive substances in the large drainage culvert and improving the corrosion resistance of the drainage system.

[0005] To achieve the above object, the present invention provides the following technical solutions: A real-time monitoring device for the corrosion condition of a large drainage culvert comprises a water intake component, one end of which is connected to a corrosion monitoring component through a pipeline. The corrosion monitoring component is a large drainage culvert simulation system. The water intake component is used to extract sewage from the large drainage culvert and transport the sewage to the corrosion monitoring component, so that the sewage in the corrosion monitoring component is consistent with the sewage in the large drainage culvert. One end of the corrosion monitoring component is connected to the gas generating component by a pipeline. The corrosion monitoring component includes an immersion chamber and a test structure installed in the immersion chamber. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data of the location of the test structure; the corrosion monitoring component is designed based on the Froude number similarity criterion, which can ensure that the sewage in the corrosion monitoring component is consistent with the pipeline flow state in the newly built or spray-repaired large drainage culvert; The corrosion monitoring component is installed near the corrosion zone of the large drainage culvert and put into use at the same time as the newly built or spray-repaired large drainage culvert to collect the corrosion conditions of the large drainage culvert in real time; the corrosion monitoring component can perform long-term corrosion resistance tests on local sections of large drainage culverts made of different materials, and can observe and record changes in the corrosion process in real time. At the same time, it can monitor the corrosion behavior of different materials used in large drainage culverts under sewage environment and multi-factor coupling, providing a realistic basis for the operation and maintenance of large drainage culverts and the pipeline inspection cycle. The output water of the corrosion monitoring component is discharged into the large drainage culvert through a pipe connected to the variable frequency sewage pump to prevent pollution overflow.

[0006] The gas generating component is used to input the corrosive gas into the immersion chamber according to the gas environment data to adjust the corrosive gas parameters in the immersion chamber.

[0007] As a further solution of the present invention: the water intake component is a variable frequency sewage pump, the variable frequency sewage pump is immersed in the sewage in the actual large drainage culvert, the input end of the variable frequency sewage pump is electrically connected to the external power supply, the variable frequency sewage pump includes a water pump and a variable frequency speed regulator, the variable frequency speed regulator is used to adjust the motor speed of the water pump, so as to control the amount of sewage transported by the water pump per unit time, and can adapt to the characteristics of large sewage flow velocity and flow fluctuation in the large drainage culvert by adjusting the water pumping flow rate of the water pump; A stainless steel filter is installed at the water inlet of the water pump. The stainless steel filter can prevent the introduction of debris into the sewage flowing into the variable frequency sewage pump. After the sewage is filtered through the stainless steel filter, it is input into the immersion chamber by the variable frequency sewage pump through the electromagnetic flowmeter; The water pump pipeline is connected to the soaking chamber, and an electromagnetic flowmeter is installed on the connecting pipeline between the water pump and the soaking chamber. The electromagnetic flowmeter is used to measure the flow rate of sewage flowing into the soaking chamber.

[0008] As a further solution of the present invention: the corrosion monitoring component includes a controller, a signal input pin of the controller is connected to a first data acquisition module, and the first data acquisition module is used to collect the gas concentration generated by sewage in a large drainage culvert; The signal input pin of the controller is connected to a second data acquisition module, and the second data acquisition module is used to collect the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage; The signal input pin of the controller is connected to a third data acquisition module, and the third data acquisition module is used to collect the pH value, the concentration value of total organic carbon and the chemical oxygen demand value of the sewage in the soaking chamber; The signal input pin of the controller is connected to a fourth data acquisition module, and the fourth data acquisition module is used to detect the flow rate and flow velocity of sewage in the large drainage culvert.

[0009] As a further solution of the present invention: the first data acquisition module includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor and a carbon dioxide gas concentration sensor, the methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage culvert, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage culvert, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage culvert; The second data acquisition module includes a temperature sensor and a humidity sensor, wherein the temperature sensor is used to collect temperature data of sewage in the large drainage culvert, and the humidity sensor is used to collect humidity data of the gas above the sewage inside the large drainage culvert, and respectively convert the temperature data and the humidity data into digital signals and send them to the processor of the controller; The third data acquisition module includes a pH sensor, a TOC sensor and a COD sensor. The pH sensor is used to collect pH value data of the sewage in the soaking chamber, and convert the pH value data into a digital signal and send it to the processor. The TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber, and convert the total organic carbon data value into a digital signal and send it to the processor. The COD sensor is used to collect the chemical oxygen demand value in the sewage; The fourth data acquisition module is an ultrasonic flow and velocity meter, which is used to measure the flow and velocity of sewage in large drainage culverts using ultrasonic waves.

[0010] As a further solution of the present invention: the test structure includes a plurality of columnar channels with openings and a plurality of test blocks, the plurality of columnar channels are fixed to the inner wall of the immersion chamber, the test blocks are detachably connected to the columnar channels, and the tops of the columnar channels are airtightly connected with flanges to ensure the airtightness of the device.

[0011] As a further solution of the present invention: solid colored glass fiber rods are embedded inside the columnar channel, the diameter of the solid colored glass fiber rods is 1mm-3mm, and a plurality of solid colored glass fiber rods are embedded inside a single test block, the length of the solid colored glass fiber rods is equal to the thickness of the test block, and the solid colored glass fiber rods are used to evaluate the corrosion degree of the steel protective layer of large drainage culverts. When the test block is corroded, the solid colored glass fiber rods will be exposed. By observing the exposed length of the solid colored glass fiber rods after corrosion and visually observing the corrosion thickness of the test block, it can be used to evaluate the corrosion degree of the steel protective layer in the large drainage culvert.

[0012] As a further solution of the present invention: the color of the solid colored glass fiber rod is red.

[0013] As a further solution of the present invention: the test block includes one or more of a reinforced concrete block, a prestressed concrete block and a high-strength block. The high-strength block is a solid block with a high-strength composite material sprayed on the surface. The immersion cavity is a hollow concrete pipe inside. The cross-section and longitudinal sections of the immersion cavity are both rectangular. In order to adapt to the greater water flow pressure and external environment that large drainage culverts may face, in practice, newly built or spray-repaired pipe sections usually use a variety of materials with higher strength, corrosion resistance, and high pressure resistance, such as reinforced concrete, prestressed concrete or high-strength composite spraying materials.

[0014] As a further solution of the present invention: a ceramic sheet is attached to the inner wall of the immersion chamber, and the ceramic sheet is an alumina ceramic sheet. An annular slice is clamped on the inner wall of the immersion chamber, and the annular slice is a local section of a large drainage culvert. A liquid level meter is installed at one end of the immersion chamber, and the liquid level meter is used to collect liquid level height data of sewage in the immersion chamber and send the collected height data to the processor. Therefore, multiple annular slices, which are also concrete pipes, are regarded as a discrete system composed of multiple small blocks. The multiple small blocks can be made of different materials used in the large drainage culvert. Different drainage pipe materials are combined and arranged along the length direction of the immersion chamber to monitor the corrosion behavior and durability of different materials in the sewage environment and the coupling of multiple factors. The ceramic sheet is attached to the inner wall not covered by the test block. The alumina ceramic sheet has a smooth surface, which can reduce turbulence and reduce the impact force of the fluid on the inner wall of the immersion chamber, thereby increasing the service life of the corrosion monitoring component. The alumina ceramic sheet has a high hardness and can enhance the wear resistance of the inner wall of the immersion chamber.

[0015] As a further solution of the present invention: the gas generation component includes a gas generation chamber, a magnetic stirrer installed inside the gas generation chamber, and a reactant supply bottle, the reactant supply bottle is used to set the type of reactant according to the gas preparation, such as sodium bicarbonate can be placed in the preparation of carbon dioxide, a reaction bottle is placed on the top of the magnetic stirrer, the reaction bottle is filled with a reactant different from that in the reactant supply bottle, such as citric acid is filled in the reaction bottle when carbon dioxide is prepared, the reactant supply bottle pipeline is connected to the reaction bottle, a peristaltic pump is installed on the pipeline between the reactant supply bottle and the reaction bottle, the peristaltic pump is used to provide the reactant in the reactant supply bottle to the reaction bottle for reaction to generate corrosive gas; One end of the peristaltic pump is electrically connected to the first gas generation control module, and the output end of the first gas generation control module is electrically connected to the electromagnetic switch valve, which is used to control the on-off of the gas from the reaction bottle into the immersion chamber; The output end of the first gas generation control module is electrically connected to the second gas generation control module, and the first gas generation control module is used to collect the gas generation signal generated by the reaction in the reaction bottle and send the gas generation signal to the controller; The second gas generation control module is used to collect the gas quantity signal in the immersion chamber and send the gas quantity signal to the controller. The controller compares the gas generation in the large drainage culvert with the gas generation in the immersion chamber. When the difference between the gas generation in the large drainage culvert and the gas generation in the immersion chamber does not meet the error range, the controller sends an adjustment signal to the first gas generation control module to adjust the gas generation in the immersion chamber to be consistent with the composition and concentration of the gas generation in the large drainage culvert. The controller has a built-in storage module, which is used to record data information received or sent by the controller.

[0016] As a further solution of the present invention: an electric heating plate and a temperature control module are embedded in the top of the magnetic stirrer, the magnetic stirrer is used to accelerate the reaction process and control the reaction temperature, the electric heating plate is used to heat the reaction solution in the reaction bottle, and the lower end of the reactant supply bottle is connected to a one-way valve, which is used to supply air to the interior of the reactant supply bottle to maintain pressure balance in the reactant supply bottle.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can ensure that the sewage in the corrosion monitoring component is consistent with the pipeline flow state in the newly built or spray-repaired large-scale drainage culvert. At the same time, after the newly built or spray-repaired large-scale drainage culvert is put into operation, there is no need to stop water for detection, which greatly improves the flexibility of large-scale drainage culvert detection. By real-time collection and simulation of the corrosion conditions in the large-scale drainage culvert, the internal corrosion conditions of the pipeline can be observed in real time, reducing the difficulty of applying countermeasures to the corrosion mechanism of the large-scale drainage culvert, which is conducive to controlling the generation of corrosive substances in the large-scale drainage culvert and improving the corrosion resistance of the drainage system.

[0018] 2. The present invention can monitor the corrosion process of large-scale drainage culverts in sewage environments in real time, and supports the influence of multiple factors such as the microbial environment in the pipeline, changes in corrosive gases, and sewage composition, sewage scouring, etc. on the corrosion behavior of concrete. It can maintain consistency with the actual corrosion environment during the monitoring process, and can be widely used in municipal drainage systems, sewage pipe design, construction, operation and maintenance, and has strong adaptability to various occasions.

[0019] 3. In view of the characteristics of large-scale drainage culverts, such as high flow velocity and large flow fluctuation, which make the pipe wall easily corroded, the present invention adopts a multi-level control and acquisition structure to achieve conditional control of the corrosion process of concrete drainage pipes, and can more efficiently and accurately monitor and evaluate the corrosion behavior of concrete of different materials under the coupling of multiple factors.

[0020] 4. The present invention is an integrated structural design, which can reasonably optimize the structural space. By adopting the actual sewage in the large drainage culvert, it can deeply restore the sewer environment where the large drainage culvert is installed. It can not only realize the long-term corrosion resistance performance test of the large drainage culvert, but also observe the corrosion process in real time, intuitively observe the corrosion situation, and realize efficient and accurate testing and evaluation through intelligent control, which provides theoretical and practical basis for the design, construction and maintenance of large and super-large drainage pipes, and can effectively reduce the corrosion resistance of large drainage culverts during actual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the real-time monitoring device of the present invention; Figure 2 is a longitudinal cross-sectional view of the soaking chamber of the present invention; Figure 3 It is a controller connection module diagram of the present invention; Figure 4 This is a diagram of a first data acquisition module of the present invention; Figure 5 This is a diagram of a second data acquisition module of the present invention; Figure 6 This is a diagram of a third data acquisition module of the present invention; Figure 7 This is a diagram of the fourth data acquisition module of the present invention.

[0022] In the figure: 1. variable frequency sewage pump; 2. stainless steel filter; 3. first data acquisition module; 4. fourth data acquisition module; 5. electromagnetic flowmeter; 6. liquid level meter; 7. second data acquisition module; 8. third data acquisition module; 9. immersion chamber; 10. gas generation chamber; 11. controller; 12. large drainage culvert; 13. columnar channel; 14. annular slice; 15. ceramic sheet; 16. solid colored glass fiber rod; 17. test block; 18. magnetic stirrer; 19. reaction bottle; 20. peristaltic pump; 21. one-way valve; 22. reactant supply bottle; 23. second gas generation control module; 24. first gas generation control module; 25. electromagnetic switch valve. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0024] Example: See also Figure 1-Figure 3 In an embodiment of the present invention, a real-time monitoring device for the corrosion condition of a large drainage culvert includes a water intake component, one end of the water intake component is connected to the corrosion monitoring component through a pipeline, the corrosion monitoring component is a large drainage culvert simulation system, and the water intake component is used to extract sewage in the large drainage culvert 12 and transport the sewage to the corrosion monitoring component, so that the sewage in the corrosion monitoring component is consistent with the sewage in the large drainage culvert 12; One end of the corrosion monitoring component is connected to the gas generating component by a pipeline. The corrosion monitoring component includes an immersion chamber 9 and a test structure installed in the immersion chamber 9. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data of the location of the test structure; The corrosion monitoring component is designed based on the Froude number similarity criterion, which can ensure that the sewage in the corrosion monitoring component is consistent with the pipeline flow pattern in the newly built or spray-repaired large drainage culvert; The corrosion monitoring component is installed near the corrosion zone of the large drainage culvert 12 and is put into use at the same time as the newly built or spray-repaired large drainage culvert 12 to collect the corrosion conditions of the large drainage culvert 12 in real time; the corrosion monitoring component can perform long-term corrosion resistance tests on local sections of large drainage culverts of different materials, and can observe and record changes in the corrosion process in real time. At the same time, it can monitor the corrosion behavior of different materials used in large drainage culverts under sewage environment and multi-factor coupling, providing a realistic basis for the operation and maintenance of large drainage culverts 12 and the pipeline inspection cycle. The effluent of the corrosion monitoring component is discharged into the large drainage culvert 12 through a pipeline connected to the variable frequency sewage pump 1 to prevent pollution overflow.

[0025] The gas generating component is used to input the corrosive gas into the immersion chamber 9 according to the gas environment data to adjust the corrosive gas parameters in the immersion chamber 9 .

[0026] Preferably, the water intake component is a variable frequency sewage pump 1, which is immersed in the sewage in the actual large drainage culvert 12, and the input end of the variable frequency sewage pump 1 is electrically connected to the external power supply. The variable frequency sewage pump 1 includes a water pump and a variable frequency speed regulator, which is used to adjust the motor speed of the water pump, thereby controlling the amount of sewage transported by the water pump per unit time, and can adapt to the characteristics of large sewage flow velocity and flow fluctuation in the large drainage culvert 12 by adjusting the water pumping flow rate of the water pump; A stainless steel filter screen 2 is installed at the water inlet of the water pump. The stainless steel filter screen 2 can prevent the introduction of foreign matter into the sewage flowing into the variable frequency sewage pump 1. After the sewage is filtered by the stainless steel filter screen 2, it is input into the soaking chamber 9 by the variable frequency sewage pump 1 through the electromagnetic flowmeter 5; The water pump pipeline is connected to the soaking chamber 9 , and an electromagnetic flowmeter 5 is installed on the connecting pipeline between the water pump and the soaking chamber 9 . The electromagnetic flowmeter 5 is used to measure the flow rate of sewage flowing into the soaking chamber 9 .

[0027] Preferably, the corrosion monitoring component includes a controller 11, a signal input pin of the controller 11 is connected to a first data acquisition module 3, and the first data acquisition module 3 is used to collect the gas concentration generated by sewage in the large drainage culvert 12; The signal input pin of the controller 11 is connected to the second data acquisition module 7, and the second data acquisition module 7 collects the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage; The signal input pin of the controller 11 is connected to a third data acquisition module 8, and the third data acquisition module 8 is used to collect the pH value, the concentration value of total organic carbon and the chemical oxygen demand value of the sewage in the soaking chamber 9; The signal input pin of the controller 11 is connected to a fourth data acquisition module 4 , and the fourth data acquisition module 4 is used to detect the flow rate and flow velocity of sewage in the large drainage culvert 12 .

[0028] like Figure 4-Figure 7 As shown, preferably, the first data acquisition module 3 includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor and a carbon dioxide gas concentration sensor, the methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage culvert 12, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage culvert 12, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage culvert 12; The second data acquisition module 7 includes a temperature sensor and a humidity sensor. The temperature sensor is used to collect temperature data of sewage in the large drainage culvert 12, and the humidity sensor is used to collect humidity data of the gas above the sewage inside the large drainage culvert 12, and convert the temperature data and humidity data into digital signals respectively and send them to the processor of the controller 11; The third data acquisition module 8 includes a pH sensor, a TOC sensor and a COD sensor. The pH sensor is used to collect pH value data of the sewage in the soaking chamber 9, and convert the pH value data into a digital signal and send it to the processor. The TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber 9, and convert the total organic carbon data value into a digital signal and send it to the processor. The COD sensor is used to collect the chemical oxygen demand value in the sewage; The fourth data acquisition module 4 is an ultrasonic flow rate and velocity meter, which is used to measure the flow rate and velocity of sewage inside the large drainage culvert 12 by using ultrasonic waves.

[0029] Preferably, the test structure includes a plurality of columnar channels 13 with openings and a plurality of test blocks 17. The plurality of columnar channels 13 are fixed to the inner wall of the immersion chamber 9. The test blocks 17 are detachably connected to the columnar channels 13. The tops of the columnar channels 13 are airtightly connected with flanges to ensure the airtightness of the device.

[0030] Preferably, a solid colored glass fiber rod 16 is embedded inside the columnar channel 13, and the diameter of the solid colored glass fiber rod 16 is 1 mm. A plurality of solid colored glass fiber rods 16 are embedded inside a single test block 17, and the length of the solid colored glass fiber rod 16 is equal to the thickness of the test block 17. The solid colored glass fiber rod 16 is used to evaluate the degree of corrosion of the steel protective layer of the large drainage culvert 12. When the test block is corroded, the solid colored glass fiber rod will be exposed. By observing the exposed length of the solid colored glass fiber rod after corrosion and visually observing the corrosion thickness of the test block, it can be used to evaluate the degree of corrosion of the steel protective layer in the large drainage culvert.

[0031] Preferably, the color of the solid colored glass fiber rod 16 is red.

[0032] Preferably, the test block 17 includes one or more of a reinforced concrete block, a prestressed concrete block and a high-strength block. The high-strength block is a solid block with a high-strength composite material sprayed on the surface. The immersion chamber 9 is a hollow concrete pipe inside. The cross-section and longitudinal sections of the immersion chamber 9 are both rectangular. In order to adapt to the greater water flow pressure and external environment that large drainage culverts may face, in practice, newly built or spray-repaired pipe sections usually use a variety of materials with higher strength, corrosion resistance, and high pressure resistance, such as reinforced concrete, prestressed concrete or high-strength composite spray materials.

[0033] Preferably, a ceramic sheet 15 is attached to the inner wall of the immersion chamber 9, and the ceramic sheet 15 is an alumina ceramic sheet. An annular slice 14 is clamped on the inner wall of the immersion chamber 9, and the annular slice 14 is a local section of a large drainage culvert. A liquid level meter 6 is installed at one end of the immersion chamber 9. The liquid level meter 6 is used to collect the liquid level height data of the sewage in the immersion chamber 9 and send the collected height data to the processor. Therefore, multiple annular slices 14, which are also concrete pipes, are regarded as a discrete system composed of multiple small blocks. The multiple small blocks can be made of different materials used in the large drainage culvert. Different drainage pipe materials are combined and arranged along the length direction of the immersion chamber 9 to monitor the corrosion behavior and durability of different materials in the sewage environment and under the coupling of multiple factors. The ceramic sheet 15 is attached to the inner wall not covered by the test block 17. The alumina ceramic sheet has a smooth surface, which can reduce turbulence and reduce the impact of the fluid on the inner wall of the immersion chamber 9, thereby increasing the service life of the corrosion monitoring component. The alumina ceramic sheet has a high hardness and can enhance the wear resistance of the inner wall of the immersion chamber 9. Figure 2 As shown, ① is the lowest pipe siltation layer; ② is the highest pipe siltation layer; ③ is the lowest water level; ④ is the highest water level.

[0034] Preferably, the gas generating assembly includes a gas generating chamber 10, a magnetic stirrer 18 installed inside the gas generating chamber 10, and a reactant supply bottle 22. The reactant supply bottle 22 is used to set the type of reactant according to the gas to be prepared. For example, sodium bicarbonate can be placed in the preparation of carbon dioxide. A reaction bottle 19 is placed on the top of the magnetic stirrer 18. The reaction bottle 19 is filled with a reactant different from that in the reactant supply bottle 22. For example, when carbon dioxide is prepared, citric acid is filled in the reaction bottle 19. The reactant supply bottle 22 is connected to the reaction bottle 19 through a pipeline. A peristaltic pump 20 is installed on the pipeline between the reactant supply bottle 22 and the reaction bottle 19. The peristaltic pump 20 is used to provide the reactant in the reactant supply bottle 22 to the reaction bottle 19 for reaction to generate corrosive gas. One end of the peristaltic pump 20 is electrically connected to the first gas generation control module 24, and the output end of the first gas generation control module 24 is electrically connected to the electromagnetic switch valve 25, which is used to control the on-off of the gas from the reaction bottle 19 into the immersion chamber 9; The output end of the first gas generation control module 24 is electrically connected to the second gas generation control module 23. The first gas generation control module 24 is used to collect the gas generation signal generated by the reaction in the reaction bottle and send the gas generation signal to the controller 11. The second gas generation control module 23 is used to collect the gas quantity signal in the immersion chamber 9 and send the gas quantity signal to the controller 11. The controller 11 compares the gas generation in the large drainage culvert 12 with the gas generation in the immersion chamber 9. When the difference between the gas generation in the large drainage culvert 12 and the gas generation in the immersion chamber 9 does not meet the error range, the controller 11 sends an adjustment signal to the first gas generation control module 24 to adjust the gas generation in the immersion chamber 9 to be consistent with the composition and concentration of the gas generation in the large drainage culvert 12. The controller 11 has a built-in storage module, which is used to record data information received or sent by the controller 11.

[0035] Preferably, an electric heating plate and a temperature control module are embedded in the top of the magnetic stirrer 18, the magnetic stirrer 18 is used to accelerate the reaction process and control the reaction temperature, the electric heating plate is used to heat the reaction solution in the reaction bottle 19, and the lower end of the reactant supply bottle 22 is connected to a one-way valve 21, and the one-way valve 21 is used to supply air to the interior of the reactant supply bottle 22 to maintain the pressure balance in the reactant supply bottle 22.

[0036] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A real-time monitoring device for corrosion of large drainage pipes and culverts, characterized in that: include, A water intake component, one end of which is connected to the corrosion monitoring component through a pipeline, and the water intake component is used to extract sewage from a large drainage culvert and transport the sewage to the corrosion monitoring component; One end of the corrosion monitoring component is connected to the gas generating component by a pipeline. The corrosion monitoring component includes an immersion chamber and a test structure installed in the immersion chamber. The corrosion monitoring component is used to receive sewage, monitor the corrosion state of the test structure immersed in the sewage, and the gas environment data of the location of the test structure; The gas generating component is used to input the corrosive gas into the immersion chamber according to the gas environment data to adjust the corrosive gas parameters in the immersion chamber.

2. A large-scale drainage pipe culvert corrosion condition real-time monitoring device according to claim 1, characterized in that: The water intake component is a variable frequency sewage pump, the input end of which is electrically connected to an external power supply, and the variable frequency sewage pump includes a water pump and a variable frequency speed regulator; A stainless steel filter is installed at the water inlet of the water pump; The water pump pipeline is connected to the soaking chamber, and an electromagnetic flowmeter is installed on the connecting pipeline between the water pump and the soaking chamber. The electromagnetic flowmeter is used to measure the flow rate of sewage flowing into the soaking chamber.

3. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 2, characterized in that: The corrosion monitoring component includes a controller, a signal input pin of the controller is connected to a first data acquisition module, and the first data acquisition module is used to collect the gas concentration generated by sewage in a large drainage culvert; The signal input pin of the controller is connected to a second data acquisition module, and the second data acquisition module is used to collect the temperature of the sewage inside the corrosion monitoring component and the humidity data of the gas above the sewage; The signal input pin of the controller is connected to a third data acquisition module, and the third data acquisition module is used to collect the pH value, total organic carbon concentration value and chemical oxygen demand value of the sewage in the soaking chamber; The signal input pin of the controller is connected to a fourth data acquisition module, and the fourth data acquisition module is used to detect the flow rate and flow velocity of sewage in the large drainage culvert.

4. A real-time monitoring device for corrosion of a large drainage culvert according to claim 3, characterized in that: The first data acquisition module includes an integrated methane gas concentration sensor, a hydrogen sulfide gas concentration sensor and a carbon dioxide gas concentration sensor, the methane gas concentration sensor is used to detect the methane gas concentration above the sewage in the large drainage culvert, the hydrogen sulfide gas concentration sensor is used to detect the hydrogen sulfide gas concentration above the sewage in the large drainage culvert, and the carbon dioxide gas concentration sensor is used to detect the carbon dioxide gas concentration above the sewage in the large drainage culvert; The second data acquisition module includes a temperature sensor and a humidity sensor, wherein the temperature sensor is used to collect temperature data of sewage in the large drainage culvert, and the humidity sensor is used to collect humidity data of the gas above the sewage inside the large drainage culvert; The third data acquisition module includes a pH sensor, a TOC sensor and a COD sensor. The pH sensor is used to collect pH value data of the sewage in the soaking chamber, and convert the pH value data into a digital signal and send it to the processor. The TOC sensor is used to collect the total organic carbon data value of the sewage in the soaking chamber, and convert the total organic carbon data value into a digital signal and send it to the processor. The COD sensor is used to collect the chemical oxygen demand value in the sewage; The fourth data acquisition module is an ultrasonic flow and velocity meter, which is used to measure the flow and velocity of sewage in large drainage culverts using ultrasonic waves.

5. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 4, characterized in that: The test structure comprises a plurality of columnar channels with openings and a plurality of test blocks. The plurality of columnar channels are fixed on the inner wall of the immersion chamber. The test blocks are detachably connected to the columnar channels. The tops of the columnar channels are airtightly connected with flanges.

6. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 5, characterized in that: Solid colored fiberglass rods are embedded inside the columnar channel, and the diameter of the solid colored fiberglass rods is 1mm-3mm. Several solid colored fiberglass rods are embedded inside a single test block. The solid colored fiberglass rods are used to evaluate the degree of corrosion of the steel protective layer of large drainage culverts.

7. A real-time monitoring device for corrosion of a large drainage culvert according to claim 6, characterized in that: The test block comprises one or more of a reinforced concrete block, a prestressed concrete block and a high-strength block. The immersion cavity is a concrete pipe with a hollow interior. Both the cross section and the longitudinal section of the immersion cavity are rectangular.

8. A real-time monitoring device for corrosion of a large drainage pipe culvert according to claim 7, characterized in that: A ceramic sheet is attached to the inner wall of the immersion chamber, and the ceramic sheet is an alumina ceramic sheet. An annular slice is clamped on the inner wall of the immersion chamber, and the annular slice is a partial section of a large drainage culvert. A liquid level meter is installed at one end of the immersion chamber. The liquid level meter is used to collect the liquid level height data of the sewage in the immersion chamber and send the collected height data to the processor.

9. A real-time monitoring device for corrosion status of a large drainage culvert according to claim 8, characterized in that: The gas generating assembly comprises a gas generating chamber, a magnetic stirrer and a reactant supply bottle installed inside the gas generating chamber, a reaction bottle is placed on the top of the magnetic stirrer, a reactant supply bottle pipeline is connected to the reaction bottle, a peristaltic pump is installed on the pipeline between the reactant supply bottle and the reaction bottle, and the peristaltic pump is used to provide the reactant in the reactant supply bottle to the reaction bottle for reaction to generate corrosive gas; One end of the peristaltic pump is electrically connected to the first gas generation control module, and the output end of the first gas generation control module is electrically connected to the electromagnetic switch valve, which is used to control the on-off of the gas from the reaction bottle into the immersion chamber; The output end of the first gas generation control module is electrically connected to the second gas generation control module, and the first gas generation control module is used to collect the gas generation signal generated by the reaction in the reaction bottle and send the gas generation signal to the controller; The second gas generation amount control module is used to collect the gas amount signal in the immersion chamber and send the gas amount signal to the controller.

10. A real-time monitoring device for corrosion of a large drainage pipe culvert according to claim 9, characterized in that: An electric heating plate and a temperature control module are embedded in the top of the magnetic stirrer. The magnetic stirrer is used to accelerate the reaction process and control the reaction temperature. The electric heating plate is used to heat the reaction solution in the reaction bottle. The lower end of the reactant supply bottle is connected to a one-way valve. The one-way valve is used to supply air to the inside of the reactant supply bottle to maintain pressure balance in the reactant supply bottle.

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