Pipe network corrosion test device and test method

Abstract

The invention relates to the technical field of pipe network corrosion tests, and provides a pipe network corrosion test device and a test method, which are used for detecting the corrosion condition of water quality and water flow velocity change on a pipe network, the pipe network corrosion test device comprises a tank body, the tank body is provided with a reaction space, the bottom of the tank body is provided with a water inlet, and the top of the tank body is provided with a water outlet and an instrument detection port; the water inlet and the water outlet are communicated with the reaction space; the rotor is rotationally arranged on the tank body, a main body of the rotor is located in the reaction space, a plurality of mounting grooves extending axially are formed in the side wall of the main body, and test pieces are inserted into the mounting grooves. The main body is provided with two parallel and crossed flow channels, and the rotation driving device drives the rotor to form a certain angular velocity and accelerates water flow in the flow channels of the rotor to simulate a higher flow velocity. By means of the technical scheme, the technical problem that in the prior art, flexible adjustment cannot be conducted according to the proportion of the water volume and the pipe wall area in an actual water supply pipe network, and the accuracy of test data is affected is solved.

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 a testing method. Background Art

[0002] In order to effectively deal with the problem of unstable scale layer of low corrosion-resistant metal pipe networks caused by water quality changes during water source allocation, it is essential to establish a scientific and reasonable evaluation method to simulate the actual water quality, hydraulic conditions and other factors to accurately evaluate the corrosion of pipe networks of different materials, which is crucial to ensure the safe and stable water supply of the pipe network. At present, the common reactor for metal pipe corrosion testing usually has a rotor in a closed container with an iron sheet fixed on the rotor. During the test, water is poured into the closed container to make the water contact with the iron sheet, and the rotation of the rotor is used to simulate the flowing water to study the corrosion of the metal pipe 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 a test method, which solves the technical problem in the prior art that the ratio of the water volume and pipe wall area in the actual water supply pipe network cannot be flexibly adjusted, thus 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, including: A tank body, wherein the tank body has a reaction space, a water inlet is provided at the bottom of the tank body, and a water outlet is provided at the top of the tank body, wherein the water inlet and the water outlet are both connected to the reaction space; 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 piece.

[0006] For example, in a pipe network corrosion test device provided by at least one embodiment of the present disclosure, the top of the tank body further has a take-in and put-out port connected to the reaction space, the take-in and put-out port is used to take and put the test piece, and the take-in and put-out port has a tapered section at one end close to the reaction space, and the cross-sectional area gradually decreases from top to bottom, and further includes: A cover, 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); A sealing gasket is sleeved on the outer circumference of the matching column, and the sealing gasket is used to seal the gap between the matching column and the tapered section.

[0007] For example, in a pipeline corrosion testing device provided by at least one embodiment of the present disclosure, the access port also has an internal thread section, the internal thread section is located above the conical section, the 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.

[0008] For example, in a pipe network corrosion test device provided in at least one embodiment of the present disclosure, the main body is cylindrical, a plurality of mounting grooves are provided on the side wall of the main body, and the test piece includes: An inserting piece, the inserting piece is plug-connected with the mounting slot; The iron block is arranged on the inserting piece, and the iron block is detachably connected to the inserting piece.

[0009] 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, the mounting groove includes a slot and a card slot that are interconnected, the card slot is used to accommodate the iron block, 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.

[0010] 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 both have an iron ion concentration sampling and detection device, and further include: An interlayer is sleeved outside 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; A water tank is located at one side of the tank body, the water tank is used to hold test water, the bottom of the water tank is connected to the water inlet, the top of the water tank is connected to the water outlet, and the water tank 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, one end of which is connected to the water tank, and the other end of which is connected to the outside world, and the air pump is used to regulate the dissolved oxygen in the water in the water tank.

[0011] 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, and in the projection of the main body along the axis direction 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.

[0012] A pipe network corrosion test method, using the pipe network corrosion test device to perform the test, comprises: S100: Determine to conduct an experiment with 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; S200: record the historical data of 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 and the water outlet; S400: In actual application, the respective variable parameters of the water quality index are input into the iron ion concentration difference model at the water inlet and the water outlet to obtain the predicted difference of the iron ion concentration at the water inlet and the water outlet.

[0013] 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: S110: referring to 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, calculating the exposed area and water volume of the test piece, and manufacturing the iron block with the same material as the pipe network according to the calculation result; S120: performing a balance test on the test device using actual running water in the pipe network, so that the test piece forms corrosion products or scale layers consistent with the actual pipe network; S130: Establish an orthogonal test 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 independent variables and dependent variables during the test; S140: Perform orthogonal experiments one by one according to the orthogonal experiment plan.

[0014] 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.

[0015] The beneficial effects of the embodiments of the present disclosure are: 1. The underwater in-and-out mode in the tank body can make the rotor completely in a liquid environment, which fits the actual use of the pipe network.

[0016] 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 flow rate on the pipe network in the actual pipe network, thereby improving the accuracy of the test.

[0017] 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

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments of the present disclosure. Obviously, the drawings described below are only some exemplary embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on the contents of the exemplary embodiments of the present disclosure and these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the reactor structure disclosed in the present invention; Figure 2 for Figure 1 A schematic cross-sectional view of the reactor; Figure 3 for Figure 2 The enlarged structural diagram at A in the middle; Figure 4 is a schematic diagram of the structure of the rotor; Figure 5 It is a schematic diagram of the structure of the test piece; Figure 6 It is a schematic diagram of the structure of the flow channel inside the rotor; Figure 7 This is a schematic diagram of the pipeline corrosion test device; In the figure: 100, base, 200, tank body, 210, reaction space, 220, water inlet, 230, water outlet, 240, pick-up and release 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

[0020] The present disclosure is further described in detail below in conjunction with 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.

[0021] In order to simplify the drawings, only the parts related to the disclosure are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0023] In the present disclosure, unless otherwise expressly specified and limited, a first feature being “above” or “below” a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being “above”, “above”, and “above” a second feature includes that the first feature is 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 that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this embodiment, terms such as "up", "down", "left", and "right" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0025] 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.

[0026] like Figure 1~Figure 3As shown, it shows a pipe network corrosion test device in one embodiment of the present disclosure, which is used to simulate the corrosion of the pipe network caused by the change of water quality and water flow rate, and includes a tank body 200, which is arranged on the base 100 and has a reaction space 210 inside. The bottom of the tank body 200 and the base 100 have a certain distance between them by relying on the supporting structure, which is convenient for connecting with the water inlet 220 at the bottom of the tank body 200 through a pipeline, and the top of the tank body 200 is provided with a water outlet 230, an instrument detection port and a take-and-put port 240. The rotation drive device 300 is installed on the tank body 200, which has a driving end. One end of the overrunning clutch 400 is connected to the driving end, and the other end is connected to the rotor 500, and the main body 510 of the rotor 500 is partially located in the reaction space 210. The overrunning clutch 400 adopts a wedge type or a ball type, and the rotation drive device 300 adopts a servo motor, and the rotation drive device 300 drives the rotor 500 to rotate through the overrunning clutch 400. In addition, a number of test pieces 600 are provided, and these test pieces 600 can be detachably arranged on the main body 510, and the specific connection method can be plug-in or clip-on. The top access port 240 is mainly used to take and place the test pieces 600. In addition, the tank body 200 and the rotor 500 are both made of non-ferrous materials, such as organic glass or plastic. The material of the test piece 600 is consistent with the material of the pipe network to be tested, and the test piece 600 simulates the situation of the pipe network in the actual water flow during the test.

[0027] The entrance direction of the installation 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 put the test piece 600 into the installation groove 511 along the axis direction of the rotor 500, which is convenient for installation and removal of the test piece 600.

[0028] In the actual test, water enters from the water inlet 220 at the bottom of the tank body 200 and flows out from the water outlet 230 at the top of the tank body 200. The rotation drive device 300 drives the rotor 500 to rotate through the overrunning clutch 400. According to the test requirements, the test piece 600 is installed, removed and replaced through the access port 240.

[0029] The underwater in-and-out mode in the tank body 200 can make the rotor 500 completely in a liquid environment, which fits the actual use of the pipe network. The rotor 500 drives the test piece 600 through the friction between the test piece 600 and the water in the reaction space 210, simulating the impact of water with flow rate in the actual pipe network on the pipe network, thereby improving the accuracy of the test. The rotation drive device 300 drives the rotor 500 to rotate through the overrunning clutch 400. When the test piece 600 needs to be taken and placed, the rotation drive device 300 can be turned off. After the rotor 500 stops rotating, the operator rotates the rotor 500 so that the test piece 600 on the rotor 500 is located below the take-and-place port 240. In this way, the size of the take-and-place port 240 can be minimized without disassembling the tank body 200. The operator simulates the ratio of the actual water volume and the pipe wall area by disassembling the number of test pieces 600 or replacing test pieces 600 of different volumes to ensure the accuracy of the test data.

[0030] The rotation driving device 300 drives the rotor 500 to rotate through the overrunning clutch 400. When taking or placing the test piece 600, the rotation of the rotor 500 to adjust the position does not need to drive the driving device 300 to rotate at the same time, thereby reducing the force required by the operator to rotate the rotor 500.

[0031] like Figure 2~Figure 3 As shown, in some examples, the end of the access opening 240 close to the reaction space 210 has a tapered section 241, and the area of ​​the tapered section 241 gradually decreases along the direction close to the reaction space 210. A cover 700 is also included, and the cover 700 is detachably arranged at the access opening 240. The cover 700 is used to close or cancel the access opening 240. The sealing gasket 710 is arranged at one end of the cover 700, and its function is to seal the gap between the cover 700 and the tapered section 241. The cover 700 can be made of organic glass, and the sealing gasket 710 is made of rubber.

[0032] In actual operation, when the test piece 600 needs to be placed through the placement port 240, the cover 700 is removed. After the operation is completed, the cover 700 is installed, and the sealing gasket 710 can fill the small gap between the cover 700 and the tapered section 241 to ensure the sealing of the reaction space 210 and prevent liquid leakage or foreign matter from entering during the test.

[0033] The design of the tapered section 241 allows the side wall of the tapered section 241 to gradually squeeze the sealing gasket 710 when the sealing gasket 710 extends into the access opening 240, thereby improving the sealing effect and ensuring that the liquid in the tank body 200 can only flow out from the water outlet 230. The detachable cover 700 is easy to operate and can flexibly control the opening and closing of the access opening 240 as needed.

[0034] like Figure 3As shown, in some examples, the access opening 240 further has an internal thread section 242, and the internal thread section 242 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.

[0035] In actual use, the cover 700 is installed on the access opening 240 through the threaded connection between 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.

[0036] The threaded connection is simple and reliable, and can provide a stable connection to ensure that the cover 700 is not easy to loosen during the test. It is convenient to install and remove the cover 700, and improve the operation efficiency. The sealing gasket 710 is combined with the threaded connection to further enhance the sealing effect and ensure the stability of the test environment.

[0037] 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 a plug-in piece 610, and the plug-in piece 610 is plug-connected with the mounting groove 511. The iron block 620 is arranged on the plug-in piece 610, and the iron block 620 is detachably connected to the plug-in piece 610. One possible implementation method is that the plug-in piece 610 can enter or leave the mounting groove 511 by moving along the axis direction of the main body 510. The plug-in piece 610 is made of plastic, and the plug-in piece 610 and the iron block 620 are connected by screws or bolts.

[0038] In actual application, the cylindrical main body 510 design makes the rotor 500 more stable when rotating. The plug 610 can be easily inserted into the installation groove 511 to achieve a quick connection between the test piece 600 and the main body 510. The iron block 620 is detachably mounted on the plug 610, which is convenient for replacing different iron blocks 620 according to the actual situation in the pipe network, so that the ratio of the contact area between the iron block 620 and the water and the water volume of the reaction space 210 is consistent with the situation in the actual pipe network.

[0039] In the process of manufacturing 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, thereby 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.

[0040] The cylindrical body 510 ensures the stability of the rotation of the rotor 500 and improves the reliability of the test. The plug-in connection between the insert 610 and the installation groove 511 is easy to operate and improves the efficiency of the installation of the test piece 600.

[0041] like Figure 4As shown, in some examples, the projection of the mounting slot 511 along the axis direction of the rotor 500 is T-shaped, and the mounting slot 511 has a slot 5112 and a clamping slot 5113. The rotor 500 also has a supporting portion 5111, which is located at the bottom of the mounting slot 511, and its function is to support the insert 610. The slot 5112 is closer to the axis of the rotor 500 than the clamping slot 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 clamping slot 5113 is used to hold the iron block 620, and the slot 5112 is connected to the clamping slot 5113, so that the operator can assemble the insert 610 and the iron block 620 in advance outside, and when the iron block 620 needs to be replaced, the insert 610 and the iron block 620 can be taken 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 being separated from the rotor 500 under 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 sides 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 increasing or decreasing the iron block 620.

[0042] 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, which is convenient for operators to grab the insert 610.

[0043] 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 the water flow on the inner wall of the pipeline in the actual pipeline is simulated. The main body 510 is a solid cylindrical shape as a whole, and the flow channel 512 inside the main body 510 can pass the water flow axially, speeding up the passing speed of the water flow in the reaction space 210, thereby speeding up 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 .

[0044] In the actual test process, water enters from the water inlet 220 at the bottom of the tank 200, and part of the water enters the flow channel 512 inside the rotor 500 through the first inlet 5121, and then flows out from the first outlet 5122. Due to the special inclined design of the flow channel 512, under the action of the water flow, the rotor 500 can rotate at a relatively low speed, thereby simulating a suitable water flow speed.

[0045] By setting a special circumferential distribution of the flow channel 512 in the rotor 500, the rotation speed of the rotor 500 required for simulating the water flow speed is reduced, energy consumption is reduced, and the safety risks caused by high-speed rotation are reduced. The water flow conditions in the actual pipe network can be simulated more realistically in the test, the accuracy and reliability of the test results are improved, and more effective technical support is provided for the safe and stable operation of the actual pipe network.

[0046] According to the actual test situation, taking the water flow velocity of 0.85m / s as an example, when the diameter of the tank 200 is 500mm, due to the deviation in the radius of the rotor 500 of different equipment, the rotor 500 needs to reach about 1000rpm. After adding two flow channels 512 to the rotor 500, the speed of the rotor 500 only needs to be 467rpm, which is about 20% lower. The flow velocity of 0.6m / s is 291rpm, which is about 30% lower. The flow velocity of 0.3m / s is 106rpm, which is about 50% lower. The flow velocity of 0.1m / s is 36rpm, which is about 50% lower.

[0047] 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 sleeved 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.

[0048] 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 to form 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 adjust the dissolved oxygen content of the water in the water tank 910, thereby simulating a water environment with different oxygen contents.

[0049] In actual tests, according to test requirements, the temperature inside the tank body 200 is adjusted using the interlayer 800, the dissolved oxygen in the water in the water tank 910 is changed by the air pump 920, and the water circulates between the water tank 910 and the tank body 200, providing diverse conditions for the test.

[0050] The iron ion concentration sampling detection device at the water inlet 220 and the water outlet 230 can be sampled periodically. 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 of 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 through the oxygen addition port, pH control port, alkalinity control port and chloride ion addition port of the water tank 910, so as to realize 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 respectively input into the statistical model as input values ​​and output values ​​to train the statistical model. The average accuracy of the data output after the trained statistical model inputs the independent variable and the data obtained from the same independent variable experiment is 92.41%.

[0051] A pipe network corrosion test method is used to conduct a test using a pipe network corrosion test device, including S100: determining to conduct a test using 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 a water inlet 220 and a water outlet 230 as a dependent variable; S200: recording historical data of individual variable parameters and dependent variable parameters during the test; S300: inputting the historical data of individual variable parameters and 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, inputting the individual variable parameters 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.

[0052] 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 result; S120: using the actual operating water 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 ions, sulfate ions and iron ion concentration changes of water quality, and recording the historical values ​​of independent variables and dependent variables during the test; S140: conducting orthogonal tests one by one according to the orthogonal test plan.

[0053] After the iron block 620 of the same material and suitable size as the pipe network is made according to the calculation results, it is combined with the non-ferrous insert 610 and inserted into the installation groove 511. The balancing time for the newly made test piece 600 is more than 7 hours, and the balancing time for the old test piece 600 is more than 24 hours. The basis for the new test piece 600 and the old test piece 600 is whether the iron block 620 has undergone corrosion test.

[0054] In some cases, after water quality adjustment is completed, it needs to be left to stand to achieve artificial water balance.

[0055] For the statistical model, the above-mentioned independent variables are input values, and the dependent variables are output values. The data obtained from the device test is used to train the statistical model to obtain the iron ion concentration difference model at the water inlet 220 and the water outlet 230. In the prediction of the corrosion degree of the pipe network when the water quality index is obtained, the accuracy rate reaches 92.41%.

[0056] 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, it includes: 1. Water quality conditions, temperature, hydraulic conditions, etc. are consistent with the actual situation; 2. The material of the pipeline network is consistent with the actual situation; 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 situation; 4. The balance test before the water source switching or water quality fluctuation test further ensures that the iron ion dissolution amount is consistent with the iron ion dissolution amount of the actual pipeline network; 5. The water quality index detection cycle is obtained through the open circuit potential test between the pipeline network material and the surface water, which reduces the test error caused by the sampling cycle.

[0057] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit it. 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, which 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), a water outlet (230) at the top of the tank body (200), the water inlet (220) and the water outlet (230) both being in communication with the reaction space (210); A rotor (500) is rotatably disposed on the tank body (200); a main body (510) of the rotor (500) is located in the reaction space (210); a side wall of the main body (510) is provided with a plurality of axially extending mounting grooves (511); the mounting grooves (511) are used to insert test pieces (600); and the test pieces (600) are used to simulate a pipe network.

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 opening (240) in communication with the reaction space (210), the take-in / take-out opening (240) being used to take-in / take-out the test piece (600), and one end of the take-in / take-out opening (240) close to the reaction space (210) comprises a tapered section (241), the cross-sectional area of ​​the tapered section (241) gradually decreases from top to bottom, and further comprises: 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 circumference 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 opening (240) further comprises an internal thread section (242), wherein the internal thread section (242) is located above the conical section (241); the cover (700) comprises an external thread section (720), wherein the sealing gasket (710) is located below the external thread section (720), and the internal thread section (242) is 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) comprises: An inserting piece (610), the inserting piece (610) being plug-connected to the mounting groove (511); The 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 axial direction of the rotor (500) is T-shaped. The mounting groove (511) comprises a slot (5112) and a clamping groove (5113) which 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 outside 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) 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 in communication with the water inlet (220), and the top of the water tank (910) is in communication with 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) has one end connected to the water tank (910) and the other end connected to the outside, and 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 device according to claim 6, characterized in that: The main body (510) has a plurality of flow channels (512), and the flow channels (512) have 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).

8. A pipeline network corrosion test method, using a pipeline network corrosion test device according to any one of claims 1 to 7 to perform a test, characterized in that: include: S100: Conducting an experiment with 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 a dependent variable; S200: record the historical data of 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 index are input into the iron ion concentration difference model at the water inlet (220) and the water outlet (230), so as to obtain the predicted difference of the iron ion concentration at the water inlet (220) and the water outlet (230).

9. A pipe network corrosion test method according to claim 8, characterized in that: The specific test steps of S100 include: S110: referring to 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, calculating the exposed area and water volume of the test piece (600), and manufacturing the iron block (620) 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 the pipe network, so that the test piece (600) forms corrosion products or scale layers consistent with the actual pipe network; S130: Establish an orthogonal test 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 independent variables and dependent variables during the test; S140: Perform orthogonal experiments one by one according to the orthogonal experiment plan.

10. A pipe network corrosion test method according to claim 9, 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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