Pipeline network corrosion test device and test method

Abstract

The present disclosure relates to the technical field of pipe network corrosion testing. An embodiment of the present disclosure provides a pipe network corrosion testing device and a testing method for detecting the corrosion of the pipe network caused by changes in water quality and water flow rate. The device comprises a tank body, the tank body having a reaction space, a water inlet at the bottom of the tank body, a water outlet and an instrument detection port at the top of the tank body, the water inlet and the water outlet both being connected to the reaction space; a rotor is rotatably arranged on the tank body, the main body of the rotor is located in the reaction space, and the side wall of the main body has a plurality of axially extending mounting grooves for inserting test pieces. The main body has two flow channels that are parallel and intersecting with each other, and the rotation drive device drives the rotor to form a certain angular velocity, while accelerating the water flow in the rotor flow channel to simulate a higher flow rate. The above technical solution solves the technical problem that the prior art cannot be flexibly adjusted according to the water volume and pipe wall area ratio in the actual water supply pipe network, thereby affecting the accuracy of the test data.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to the technical field of pipeline corrosion testing, and in particular, to a pipeline corrosion testing device and testing method. Background Art

[0002] In order to effectively address the problem of unstable scale layers on low-corrosion-resistant metal pipe networks caused by changes in water quality during water allocation, it is crucial to establish a scientific and reasonable evaluation method to simulate actual water quality, hydraulic conditions and other factors to accurately assess the corrosion of pipe networks made of different materials, which is crucial to ensuring the safe and stable water supply of the pipe network. At present, the common reactor used for metal pipe corrosion testing usually has a rotor set in a closed container with an iron sheet fixed on the rotor. During the test, water is injected into the closed container to make the water contact the iron sheet. The rotation of the rotor is used to simulate flowing water to study the corrosion of metal pipes under the action of water flow.

[0003] However, this existing technology has obvious defects: First, due to the limitation of laboratory space, the size of the reactor device is limited, resulting in a generally small rotor radius. If the water flow velocity requirements of the actual pipeline network are to be met, the rotor needs to provide an extremely high rotation speed, which not only consumes a lot of energy, but also poses serious safety hazards to the high-speed rotating rotor, such as the risk of component wear and falling off, which may cause damage to test personnel and equipment. Second, the area of the iron sheet on the rotor is fixed, and it cannot be flexibly adjusted according to the proportional relationship between different water volumes and pipe wall areas in the actual water supply network. It is difficult to accurately simulate the actual working conditions, which greatly reduces the accuracy and reliability of the test results, and cannot provide accurate and effective technical support for the safe and stable operation of the actual pipeline network. Summary of the Invention

[0004] To overcome the above-mentioned defects, the embodiments of the present disclosure provide a pipe network corrosion test device and test method, which solves the technical problem in the prior art that the ratio of water volume and pipe wall area in the actual water supply network cannot be flexibly adjusted, affecting the accuracy of the test data.

[0005] According to one aspect, at least one embodiment of the present disclosure provides a pipe network corrosion test device for detecting the corrosion of a pipe network test piece caused by changes in water quality and water flow rate, comprising:

[0006] A tank body, wherein the tank body has a reaction space, a water inlet at the bottom of the tank body, and a water outlet at the top of the tank body, wherein both the water inlet and the water outlet are connected to the reaction space;

[0007] The rotor is rotatably arranged on the tank body. The main body of the rotor is located in the reaction space. The side wall of the main body is provided with a plurality of axially extending mounting grooves, and the mounting grooves are used for inserting the test pieces.

[0008] For example, in a pipe network corrosion testing device provided in at least one embodiment of the present disclosure, the top of the tank body further has a take-in / take-out port communicating with the reaction space, the take-in / take-out port is used to take the test piece in, and the take-in / take-out port has a tapered section at one end close to the reaction space, with the cross-sectional area gradually decreasing from top to bottom, and further includes:

[0009] A cover is detachably arranged on the access opening, the cover is used to close or open the access opening, and a matching column extending downward is provided at the bottom of the cover (700);

[0010] A sealing gasket is sleeved on the outer circumference of the matching column, and is used to seal the gap between the matching column and the tapered section.

[0011] For example, in a pipeline corrosion testing device provided by at least one embodiment of the present disclosure, the taking and releasing port also has an internal thread section, the internal thread section is located above the conical section, the sealing cover has an external thread section, the sealing gasket is located below the external thread section, and the internal thread section is threadedly connected to the external thread section.

[0012] For example, in a pipe network corrosion test device provided in at least one embodiment of the present disclosure, the main body is cylindrical, and a plurality of mounting grooves are provided on the side wall of the main body. The test piece includes:

[0013] An inserting piece, the inserting piece is plug-connected to the installation slot;

[0014] The iron block is arranged on the inserting piece, and the iron block is detachably connected to the inserting piece.

[0015] For example, in a pipeline corrosion testing device provided by at least one embodiment of the present disclosure, the projection of the mounting groove along the axial direction of the rotor is T-shaped, and the mounting groove includes a slot and a card slot that are interconnected, the card slot is used to accommodate the iron block, and the opening width of the card slot is smaller than the opening width of the slot, and the rotor also has a supporting portion located at the lower end of the mounting groove and used to support the test piece.

[0016] For example, in a pipe network corrosion test device provided in at least one embodiment of the present disclosure, the water inlet and the water outlet are both provided with an iron ion concentration sampling and detection device, and further comprising:

[0017] An interlayer is sleeved on the outside of the tank body, the interlayer has a heat exchange medium inlet and a heat exchange medium outlet, and the interlayer is used to adjust the temperature inside the tank body;

[0018] a water tank located on one side of the tank body, the water tank being used to hold test water, the bottom of the water tank being connected to the water inlet, the top of the water tank being connected to the water outlet, the water tank having an oxygen addition port, a pH control port, an alkalinity control port, a chloride ion addition port, and a sulfate addition port;

[0019] An air pump, one end of which is connected to the water tank and the other end of which is connected to the outside world, is used to regulate the dissolved oxygen in the water in the water tank.

[0020] For example, in a pipeline corrosion testing device provided by at least one embodiment of the present disclosure, the main body has a plurality of flow channels, the flow channels have a first inlet and a first outlet, the first inlet is close to the water inlet, and the first outlet is close to the water outlet. In the projection of the main body along the axis of the rotor, the first inlet and the first outlet of the same flow channel are spaced apart along the rotation direction of the rotor.

[0021] A pipe network corrosion test method, using the pipe network corrosion test device to conduct the test, comprises:

[0022] S100: determining to conduct an experiment using the pH value, oxygen concentration, alkalinity, temperature, chloride ion concentration, and sulfate concentration of water quality indicators as independent variables and the difference in iron ion concentration at the water inlet and the water outlet as the dependent variable;

[0023] S200: Record the historical data of the individual variable parameters and dependent variable parameters during the test;

[0024] S300: Inputting historical data of the individual variable parameters and the dependent variable parameters into a statistical model to obtain a model of the difference in iron ion concentration at the water inlet and the water outlet;

[0025] S400: In actual applications, the respective variable parameters of the water quality indicators are input into the iron ion concentration difference model at the water inlet and the water outlet to obtain the predicted difference in iron ion concentration at the water inlet and the water outlet.

[0026] For example, in a pipeline corrosion test method provided in at least one embodiment of the present disclosure, the specific test steps of S100 include:

[0027] S110: Calculating the exposed area and water volume of the test piece based on the material of the pipe network and the ratio between the water volume and the pipe wall area in the actual water supply pipe network, and manufacturing the iron block with the same material as the pipe network according to the calculation result;

[0028] S120: performing a balance test on the test device using actual operating water in the pipe network, so that the test piece forms corrosion products or scale layers consistent with the actual pipe network;

[0029] S130: Establish an orthogonal experimental plan based on the conditions that affect the dissolution of iron ions: pH value, oxygen content, alkalinity, temperature, chloride ion, sulfate ion and iron ion concentration changes in water quality, and record the historical values of the independent variables and dependent variables during the experiment;

[0030] S140: Perform orthogonal experiments one by one according to the orthogonal experiment plan.

[0031] For example, in a pipe network corrosion test method provided in at least one embodiment of the present disclosure, after the water quality is prepared, it needs to be left to stand to achieve artificial water balance.

[0032] The beneficial effects of the embodiments of the present disclosure are:

[0033] 1. The underwater inlet and outlet mode in the tank body can make the rotor completely in the liquid environment, which is in line with the actual use of the pipeline network.

[0034] 2. The rotor drives the test piece through the friction between the test piece and the water in the reaction space, simulating the impact of water with a high flow rate in the actual pipe network on the pipe network, thereby improving the accuracy of the test.

[0035] 3. The operator simulates the ratio of actual water volume to pipe wall area by disassembling and increasing or decreasing the number of test pieces or replacing test pieces of different volumes to ensure the accuracy of the test data. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly describes the drawings required for use in describing the embodiments of the present disclosure. Obviously, the drawings described below are merely some exemplary embodiments of the present disclosure. Those skilled in the art can, without inventive effort, derive other drawings based on the content of the exemplary embodiments of the present disclosure and these drawings.

[0037] Figure 1 Schematic diagram of the reactor structure disclosed in the present invention;

[0038] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the reactor;

[0039] Figure 3 for Figure 2 A in the middle is an enlarged structural diagram;

[0040] Figure 4 is a schematic diagram of the rotor structure;

[0041] Figure 5 Schematic diagram of the structure of the test piece;

[0042] Figure 6 Schematic diagram of the structure of the rotor internal flow channel;

[0043] Figure 7 This is a schematic diagram of the pipeline corrosion test device;

[0044] In the figure: 100, base, 200, tank body, 210, reaction space, 220, water inlet, 230, water outlet, 240, pick-up and drop port, 300, rotation drive device, 400, overrunning clutch, 500, rotor, 510, main body, 600, test piece, 241, tapered section, 700, cover, 710, sealing gasket, 242, internal thread section, 720, external thread section, 511, mounting groove, 610, insert, 620, iron block, 5111, supporting part, 5112, slot, 5113, card slot, 512, flow channel, 5121, first inlet, 5122, first outlet, 800, interlayer, 810, heat exchange medium inlet, 820, heat exchange medium outlet, 910, water tank, 920, air pump. DETAILED DESCRIPTION

[0045] The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, rather than to limit the present disclosure.

[0046] To simplify the drawings, only the parts relevant to the disclosure are schematically shown in each figure; they do not represent the actual structure of the product. Furthermore, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically shown or labeled. In this document, "one" not only means "only one" but also "more than one," and "several" includes "two" and "more than two."

[0047] It should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0048] In the present disclosure, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0049] In the description of this embodiment, the terms "up", "down", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present disclosure.

[0050] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0051] like Figures 1 to 3 , which illustrates a pipeline corrosion test device in one embodiment of the present disclosure, used to simulate and test the corrosion effects of water quality and water flow rate changes on pipelines. The device comprises a tank 200 mounted on a base 100 and having a reaction space 210 therein. The bottom of the tank 200 is spaced apart from the base 100 by a support structure, facilitating connection to a water inlet 220 at the bottom of the tank 200 via a pipe. The top of the tank 200 is provided with a water outlet 230, an instrument inspection port, and a loading and unloading port 240. A rotation drive device 300 is mounted on the tank 200 and has a drive end. An overrunning clutch 400 is connected to the drive end at one end and to a rotor 500 at the other end. The main body 510 of the rotor 500 is partially located within the reaction space 210. The overrunning clutch 400 utilizes a wedge-type or ball-type design, and the rotation drive device 300 utilizes a servo motor. The rotation drive device 300 drives the rotor 500 to rotate via the overrunning clutch 400. In addition, several test pieces 600 are provided. These test pieces 600 are detachably mounted on the main body 510, and can be connected by plugging or snapping. The top access port 240 is primarily used to remove and place the test pieces 600. Furthermore, both the tank 200 and the rotor 500 are constructed of non-ferrous materials, such as plexiglass or plastic. The material of the test pieces 600 is consistent with that of the pipe network to be tested, and the test pieces 600 simulate the conditions of the pipe network under actual water flow during the test.

[0052] The entrance direction of the mounting groove 511 on the side wall of the main body 510 faces the access port 240. When the operator installs the test piece 600, he only needs to place the test piece 600 into the mounting groove 511 along the axis direction of the rotor 500, which facilitates the installation and removal of the test piece 600.

[0053] In actual testing, water enters through the water inlet 220 at the bottom of the tank 200 and flows out through the water outlet 230 at the top of the tank 200. The rotation drive 300 drives the rotor 500 through the overrunning clutch 400. The test piece 600 is installed, removed, and replaced through the access port 240 according to test requirements.

[0054] The underwater inlet and outlet mode within the tank 200 allows the rotor 500 to be completely immersed in a liquid environment, closely matching the actual use of the pipe network. The rotor 500 drives the test piece 600 through friction between the test piece 600 and the water in the reaction space 210, simulating the impact of water with a high flow rate on the pipe network in an actual pipe network, thereby improving the accuracy of the test. The rotation drive device 300 drives the rotor 500 to rotate via the overrunning clutch 400. When the test piece 600 needs to be removed or placed, the rotation drive device 300 can be turned off. After the rotor 500 stops rotating, the operator can rotate the rotor 500 so that the test piece 600 on the rotor 500 is located below the access port 240. This method can minimize the size of the access port 240 without disassembling the tank 200. By removing or increasing the number of test pieces 600 or replacing them with test pieces 600 of different sizes, the operator can simulate the ratio of actual water volume to pipe wall area, ensuring the accuracy of the test data.

[0055] The rotation driving device 300 drives the rotor 500 to rotate via the overrunning clutch 400. When taking or placing the test piece 600, the position of the rotor 500 can be adjusted without simultaneously driving the driving device 300 to rotate, thereby reducing the force required by the operator to rotate the rotor 500.

[0056] like Figure 2~Figure 3 As shown, in some examples, the access opening 240 has a tapered section 241 at one end near the reaction space 210, with the area of the tapered section 241 gradually decreasing as it approaches the reaction space 210. A cover 700 is also included, which is detachably disposed at the access opening 240. The cover 700 is used to close or unclose the access opening 240. A sealing gasket 710 is disposed at one end of the cover 700 and functions to seal the gap between the cover 700 and the tapered section 241. The cover 700 may be made of organic glass, and the sealing gasket 710 may be made of rubber.

[0057] In actual operation, when the test piece 600 needs to be placed through the access port 240, the cover 700 is removed. After the operation is completed, the cover 700 is installed. At this time, the sealing gasket 710 can fill the small gap between the cover 700 and the tapered section 241, ensuring the sealing of the reaction space 210 and preventing liquid leakage or foreign matter from entering during the test.

[0058] The design of the tapered section 241 allows the sidewalls of the tapered section 241 to gradually squeeze the sealing gasket 710 as the sealing gasket 710 extends into the access opening 240, thereby improving the sealing effect and ensuring that the liquid in the tank 200 can only flow out of the water outlet 230. The removable cover 700 is easy to operate and can flexibly control the opening and closing of the access opening 240 as needed.

[0059] like Figure 3As shown, in some examples, the access opening 240 further has an internal thread section 242, which is located above the tapered section 241. The cover 700 has an external thread section 720, and the sealing gasket 710 is located at one end of the cover 700 away from the external thread section 720.

[0060] In actual use, the cover 700 is installed on the access opening 240 by threading the internal thread section 242 and the external thread section 720. When the cover 700 is tightened, the sealing gasket 710 is squeezed by the side wall of the tapered section 241, thereby better sealing the gap between the cover 700 and the tapered section 241.

[0061] The threaded connection is simple and reliable, providing a secure connection and ensuring that cover 700 does not loosen during testing. This facilitates installation and removal of cover 700, improving operational efficiency. The combination of sealing gasket 710 and the threaded connection further enhances the sealing effect and ensures a stable test environment.

[0062] like Figure 4~Figure 5 As shown, in some examples, the main body 510 is cylindrical and has a plurality of mounting grooves 511 on its side wall. The test piece 600 includes an insert 610, which is plug-connected to the mounting groove 511. An iron block 620 is disposed on the insert 610, and the iron block 620 is detachably connected to the insert 610. One possible implementation method is that the insert 610 can enter or leave the mounting groove 511 by moving along the axis of the main body 510. The insert 610 is made of plastic, and the insert 610 and the iron block 620 are connected by screws or bolts.

[0063] In practice, the cylindrical design of the main body 510 provides greater stability during rotor 500 rotation. The insert 610 easily inserts into the mounting slot 511, enabling quick connection between the test piece 600 and the main body 510. The iron block 620 is removably mounted on the insert 610, facilitating replacement of the iron block 620 according to actual pipe network conditions. This ensures that the ratio of the contact area between the iron block 620 and the water volume in the reaction chamber 210 remains consistent with actual pipe network conditions.

[0064] During the manufacturing process of the insert 610, a placement groove can be added to the insert 610. The inner wall of the placement groove is close to the side wall of the iron block 620, and the outer wall of the placement groove fits the size of the installation groove 511, eliminating the gap position between the iron block 620 and the installation groove 511 that affects the test data due to the uncertain water flow rate.

[0065] The cylindrical body 510 ensures the smooth rotation of the rotor 500 and improves the reliability of the test. The plug-in connection between the insert 610 and the installation slot 511 is easy to operate and improves the efficiency of the installation of the test piece 600.

[0066] like Figure 4As shown, in some examples, the projection of the mounting slot 511 along the axis of the rotor 500 is T-shaped, and the mounting slot 511 includes a slot 5112 and a latch 5113. The rotor 500 also includes a support portion 5111, which is located at the bottom of the mounting slot 511 and functions to support the insert 610. The slot 5112 is closer to the axis of the rotor 500 than the latch 5113. The slot 5112 is used to hold the insert 610, which can better expose the iron block 620 to the water in the reaction space 210. The latch 5113 is used to hold the iron block 620, and the slot 5112 is connected to the latch 5113, allowing the operator to assemble the insert 610 and the iron block 620 in advance externally. When the iron block 620 needs to be replaced, the insert 610 and the iron block 620 can be taken in and placed at the same time. The T-shaped mounting groove 511 can limit the insert 610 at the connection between the slot 5112 and the slot 5113, preventing the insert 610 from detaching from the rotor 500 due to the centrifugal force generated by the rotation of the rotor 500. The size of the slot 5113 is configured so that when the iron block 620 is accommodated in the slot 5113, only one side of the iron block 620 is located outside the slot 5113. After the iron block 620 enters the slot 5113, the bottom surface of the iron block 620 abuts against the supporting portion, and the three side surfaces of the iron block 620 abut against the insert 610 and the two side walls of the slot 5113, respectively, so that the area of the iron block 620 exposed to the water can be controlled, which is conducive to improving the accuracy of the test results. It should be noted that this method is suitable for controlling the reaction area by adding or removing the iron block 620.

[0067] In actual installation, the axial length of the insert 610 along the rotor 500 can be set to be greater than the length of the slot 5112. After the insert 610 is inserted into the slot 5112, a portion of the insert 610 is still exposed outside the slot 5112, making it easier for the operator to grab the insert 610.

[0068] like Figure 6As shown, in some examples, the main body 510 has a plurality of flow channels 512 inside. Each flow channel 512 has a first inlet 5121 and a first outlet 5122, and in the projection of the main body 510 in the axial direction, the first inlet 5121 and the first outlet 5122 of the same flow channel 512 are spaced apart along the rotation direction of the main body 510. The main body 510 is driven to rotate by an external servo motor, and the main body 510 rotates in the reaction space 210. By relying on the rotation of the main body 510 in the reaction space 210, combined with the water flow in the reaction space 210 flowing from the water inlet 220 to the water outlet 230 under the action of an external pump, the impact of water flow on the inner wall of the pipe in an actual pipeline is simulated. The main body 510 is a solid cylindrical shape as a whole. The flow channel 512 inside the main body 510 can pass water axially, accelerating the speed of water flow in the reaction space 210, thereby increasing the water flow speed when the rotation speed of the main body 510 remains unchanged. The special inclination of the flow channel 512 inside the main body 510 is consistent with the rotation direction of the main body 510, which can make the water flow adapt to the centrifugal force brought by the main body 510 and further increase the speed of the water flow in the flow channel 512.

[0069] During the actual test, water entered through the water inlet 220 at the bottom of the tank 200. Some of the water entered the flow channel 512 within the rotor 500 through the first inlet 5121, and then flowed out through the first outlet 5122. Due to the special inclined design of the flow channel 512, the rotor 500 was able to rotate at a relatively low speed under the action of the water flow, thus simulating a suitable water flow velocity.

[0070] By providing a special circumferential distribution of flow channels 512 within rotor 500, the rotor 500 speed required to simulate water flow velocity is reduced, thereby reducing energy consumption and mitigating safety risks associated with high-speed rotation. This allows the test to more realistically simulate the water flow conditions in an actual pipe network, improving the accuracy and reliability of the test results and providing more effective technical support for the safe and stable operation of actual pipe networks.

[0071] Based on actual test results, taking a water flow velocity of 0.85 m / s as an example, with a tank 200 having a diameter of 500 mm, the rotor 500 would need to reach approximately 1000 rpm due to variations in the radius of the rotor 500 across different devices. However, by adding two flow channels 512 to the rotor 500, the rotor 500 only needs to rotate at 467 rpm, a reduction of approximately 20%. At a flow velocity of 0.6 m / s, the speed is reduced to 291 rpm, a reduction of approximately 30%. At a flow velocity of 0.3 m / s, the speed is reduced to 106 rpm, a reduction of approximately 50%. At a flow velocity of 0.1 m / s, the speed is reduced to 36 rpm, a reduction of approximately 50%.

[0072] like Figure 7As shown, in some examples, the water inlet 220 and the water outlet 230 both have an iron ion concentration sampling and detection device, and also include an interlayer 800, which is mounted on the outside of the tank body 200, and the interlayer 800 has a heat exchange medium inlet 810 and a heat exchange medium outlet 820, and the interlayer 800 is used to adjust the temperature inside the tank body 200; the water tank 910 is located on one side of the tank body 200, and the water tank 910 is used to hold test water. The bottom of the water tank 910 is connected to the water inlet 220, and the top of the water tank 910 is connected to the water outlet 230; the water tank 910 also has an oxygen addition port, a pH control port, an alkalinity control port and a chloride ion addition port; one end of the air pump 920 is connected to the water tank 910, and the other end is connected to the outside world, and the air pump 920 is used to regulate the dissolved oxygen in the water in the water tank 910.

[0073] By introducing heat exchange media of different temperatures into the interlayer 800, the temperature inside the tank body 200 is adjusted to simulate different environmental conditions. The water tank 910 is located on one side of the tank body 200 and is used to hold test water. The bottom of the water tank 910 is connected to the water inlet 220 of the tank body 200, and the top is connected to the water outlet 230, forming a circulating water circuit. One end of the air pump 920 is connected to the water tank 910, and the other end is connected to the outside world. When the air pump 920 is working, it can regulate the dissolved oxygen content of the water in the water tank 910, thereby simulating water environments with different oxygen contents.

[0074] In actual experiments, according to the test requirements, the interlayer 800 is used to adjust the temperature inside the tank body 200, and the dissolved oxygen in the water in the water tank 910 is changed by the air pump 920. The water circulates between the water tank 910 and the tank body 200, providing diverse conditions for the test.

[0075] The iron ion concentration sampling detection device at the water inlet 220 and the water outlet 230 can periodically sample. By comparing the results of the two iron ion concentration sampling detection devices, the corrosion amount of the test piece in the reaction space 210 can be obtained, and the difference between the detection results of the two iron ion concentration sampling detection devices is used as the dependent variable of the experiment. The water quality in the water tank 910 can be dynamically adjusted by the oxygen addition port, pH control port, alkalinity control port and chloride ion addition port of the water tank 910, thereby realizing the change of the independent variable during the experiment. During the experiment, the dependent variable model corresponding to different independent variables is recorded, and then the recorded independent variables and dependent variables are input into the statistical model as input values and output values respectively to train the statistical model. The average accuracy rate of the data output by the trained statistical model after inputting the independent variables and the data obtained from the same independent variable experiment is 92.41%.

[0076] A pipe network corrosion test method is used to conduct a test using a pipe network corrosion test device, comprising S100: determining to conduct a test using pH value, oxygen concentration, alkalinity, temperature, chloride ion concentration, and sulfate radical concentration of water quality indicators as independent variables and the difference in iron ion concentration at a water inlet 220 and a water outlet 230 as a dependent variable; S200: recording historical data of the parameters of the respective variable and the parameters of the dependent variable during the test; S300: inputting the historical data of the parameters of the respective variable and the parameters of the dependent variable into a statistical model to obtain a model of the difference in iron ion concentration at the water inlet 220 and the water outlet 230; and S400: in actual application, inputting the parameters of the respective variable of the water quality indicators into the model of the difference in iron ion concentration at the water inlet 220 and the water outlet 230 to obtain a predicted difference in iron ion concentration at the water inlet 220 and the water outlet 230.

[0077] In some examples, S110: referring to the material of the pipe network and the proportional relationship between the water volume and the pipe wall area in the actual water supply pipe network, the exposed area and water volume of the test piece 600 are calculated, and an iron block 620 of the same material as the pipe network is manufactured according to the calculation results; S120: using the actual operating water body in the pipe network to conduct a balance test on the test device, so that the test piece 600 forms corrosion products or scale layers consistent with the actual pipe network; S130: establishing an orthogonal test plan based on the conditions affecting the dissolution of iron ions: pH value, oxygen content, alkalinity, temperature, chloride ion, sulfate and iron ion concentration changes of water quality, and recording the historical values of independent variables and dependent variables during the test process; S140: conducting orthogonal experiments one by one according to the orthogonal experiment plan.

[0078] Based on the calculated results, an iron block 620 of the same material and appropriate size as the pipe network is fabricated. This block is then assembled with the non-ferrous insert 610 and inserted into the mounting slot 511. Newly fabricated test pieces 600 are allowed to equilibrate for at least 7 hours, while older test pieces 600 are allowed to equilibrate for at least 24 hours. This equilibration is determined by whether the iron block 620 has undergone corrosion testing.

[0079] In some cases, after water quality adjustment is completed, it needs to be left to stand to achieve artificial water balance.

[0080] For statistical models, the independent variables are inputs and the dependent variables are outputs. Data from device tests were used to train the statistical model, which derived a model for the difference in iron ion concentrations at the water inlet 220 and outlet 230. This model, when used to predict the degree of corrosion in the pipe network based on water quality indicators, achieved an accuracy rate of 92.41%.

[0081] This device and method simulates many factors and conditions of the actual operation of the pipeline network, and simulates the actual operation of the pipeline network to the greatest extent, ensuring that it has a guiding role in the actual operation of the pipeline network. Specifically, they include: 1. Water quality conditions, temperature, hydraulic conditions, etc. are consistent with the actual conditions; 2. The material of the pipeline network is consistent with the actual conditions; 3. The water volume of the pipeline network is consistent with the ratio of the contact area of the pipeline network, so that the iron ion dissolution amount in this test is consistent with the actual conditions; 4. A balance test is performed before the water source switch or water quality fluctuation test to further ensure that the iron ion dissolution amount is consistent with the iron ion dissolution amount in the actual pipeline network; 5. The water quality index detection cycle is obtained by the open circuit potential test between the pipeline network material and the surface water, reducing the test error caused by the sampling cycle.

[0082] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure and are not limiting. Although the present disclosure has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and all of these should be included in the scope of the claims of the present disclosure.

Claims

1. A pipe network corrosion test device, used to test and detect the corrosion of pipe networks caused by changes in water quality and water flow rate, characterized in that: include: A tank body (200), the tank body (200) having a reaction space (210), a water inlet (220) at the bottom of the tank body (200), and a water outlet (230) at the top of the tank body (200), wherein the water inlet (220) and the water outlet (230) are both in communication with the reaction space (210); A rotor (500) is rotatably mounted on the tank body (200), a main body (510) of the rotor (500) is located in the reaction space (210), and a side wall of the main body (510) is provided with a plurality of axially extending mounting grooves (511), the mounting grooves (511) being used to insert test pieces (600), and the test pieces (600) are used to simulate a pipe network; The main body (510) has a plurality of flow channels (512), each of the flow channels (512) having a first inlet (5121) and a first outlet (5122), wherein the first inlet (5121) is close to the water inlet (220), and the first outlet (5122) is close to the water outlet (230), and in a projection of the main body (510) along the axis of the rotor (500), the first inlet (5121) and the first outlet (5122) of the same flow channel (512) are spaced apart along the rotation direction of the rotor (500).

2. A pipe network corrosion test device according to claim 1, characterized in that: The top of the tank body (200) further comprises a take-in / take-out port (240) in communication with the reaction space (210), the take-in / take-out port (240) being used for taking in and placing the test piece (600), and the take-in / take-out port (240) has a tapered section (241) at one end close to the reaction space (210), the cross-sectional area of the tapered section (241) gradually decreasing from top to bottom, and further comprising: A cover (700) is detachably arranged on the access opening (240), the cover (700) is used to close or open the access opening (240), and a matching column extending downward is provided at the bottom of the cover (700); A sealing gasket (710) is sleeved on the outer periphery of the matching column, and the sealing gasket (710) is used to seal the gap between the matching column and the tapered section (241).

3. A pipe network corrosion test device according to claim 2, characterized in that: The access port (240) further comprises an internal thread section (242), the internal thread section (242) being located above the conical section (241), the cover (700) comprising an external thread section (720), the sealing gasket (710) being located below the external thread section (720), and the internal thread section (242) being threadedly connected to the external thread section (720).

4. A pipe network corrosion test device according to claim 1, characterized in that: The test piece (600) includes: An inserting piece (610), the inserting piece (610) is plug-connected to the mounting groove (511); An iron block (620) is arranged on the inserting piece (610), and the iron block (620) is detachably connected to the inserting piece (610).

5. A pipe network corrosion test device according to claim 4, characterized in that: The projection of the mounting groove (511) along the axis direction of the rotor (500) is T-shaped. The mounting groove (511) comprises a slot (5112) and a clamping groove (5113) that are interconnected. The clamping groove (5113) is used to accommodate the iron block (620). The opening width of the clamping groove (5113) is smaller than the opening width of the slot (5112). The rotor (500) further comprises a supporting portion located at the lower end of the mounting groove (511) and used to support the test piece (600).

6. A pipe network corrosion test device according to claim 1, characterized in that: The water inlet (220) and the water outlet (230) are both provided with an iron ion concentration sampling and detection device, and further include: An interlayer (800) is sleeved on the outside of the tank body (200) and is used to adjust the temperature inside the tank body (200). The interlayer (800) has a heat exchange medium inlet (810) and a heat exchange medium outlet (820); A water tank (910) is located on one side of the tank body (200). The water tank (910) is used to hold test water. The bottom of the water tank (910) is connected to the water inlet (220), and the top of the water tank (910) is connected to the water outlet (230). The water tank (910) also has an oxygen addition port, a pH control port, an alkalinity control port, a chloride ion addition port, and a sulfate addition port. An air pump (920) is connected to the water tank (910) at one end and to the outside at the other end. The air pump (920) is used to regulate the dissolved oxygen in the water in the water tank (910).

7. A pipe network corrosion test method, using a pipe network corrosion test device according to any one of claims 1 to 6 for testing, characterized in that: include: S100: Determine to conduct an experiment using the pH value, oxygen concentration, alkalinity, temperature, chloride ion concentration, and sulfate concentration of water quality indicators as independent variables and the difference in iron ion concentration at the water inlet (220) and the water outlet (230) as the dependent variable; S200: Record the historical data of the individual variable parameters and dependent variable parameters during the test; S300: Inputting historical data of the individual variable parameters and the dependent variable parameters into a statistical model to obtain a model of the difference in iron ion concentration at the water inlet (220) and the water outlet (230); S400: In actual application, the respective variable parameters of the water quality indicators are input into the iron ion concentration difference model at the water inlet (220) and the water outlet (230), and the predicted difference of the iron ion concentration at the water inlet (220) and the water outlet (230) is obtained.

8. A pipe network corrosion test method according to claim 7, characterized in that: The specific test steps of S100 include: S110: referring to the material of the pipe network and the proportional relationship between the water volume and the pipe wall area in the actual water supply pipe network, calculating the exposed area and water volume of the test piece (600), and manufacturing the test piece (600) of the same material as the pipe network according to the calculation result; S120: performing a balance test on a test device using actual running water in a pipe network, so that the test piece (600) forms corrosion products or a scale layer consistent with the actual pipe network; S130: Establish an orthogonal experimental plan based on the conditions that affect the dissolution of iron ions: pH value, oxygen content, alkalinity, temperature, chloride ion, sulfate ion and iron ion concentration changes in water quality, and record the historical values of the independent variables and dependent variables during the experiment; S140: Perform orthogonal experiments one by one according to the orthogonal experiment plan.

9. A pipe network corrosion test method according to claim 8, characterized in that: After the water quality is adjusted, it needs to be left to stand to achieve artificial water balance.

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