A u-shaped pipeline gas-liquid erosion experimental device and an operating method thereof

Abstract

The application discloses a U-shaped pipeline gas-liquid erosion experimental device, which comprises a gas-phase injection system, a liquid-phase injection system and an erosion device connected with a pipeline; the gas-phase injection system is used for injecting gas into the pipeline; the liquid-phase injection system is used for injecting an ammonium chloride solution into the pipeline, and the tail end of the liquid-phase injection system is equipped with an atomizing nozzle; the erosion device is internally equipped with a U-shaped sample pipe used for erosion experiment; and the erosion device is equipped with a data collection and processing system; the detection precision is high, the injection conditions of the gas phase and the liquid phase can be accurately controlled through the gas-phase injection system and the liquid-phase injection system; the device has wide applicability and can be used for experimentally studying the influence of different ammonium chloride solution concentrations and air flow on pipeline erosion; the operation steps are simple, phenomena are obvious and direct observation is facilitated, and the experimental efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical engineering detection, in particular to a U-shaped pipeline gas-liquid erosion experimental device and an operating method thereof. BACKGROUND

[0002] In the chemical production process, the integrity and safety of the pipeline system are crucial, especially in the case of handling corrosive media such as ammonium chloride solution. Many chemical plants contain ammonium chloride, such as hydrogenation devices. Ammonium chloride dissolves in water to form an acidic environment with corrosion, which can easily cause the inner wall material of the pipeline to be eroded, leading to erosion of the pipeline wall, pipeline leakage, equipment damage, and even triggering safety accidents.

[0003] Existing erosion control techniques mainly focus on optimizing pipeline material selection, increasing pipeline wall thickness, or using corrosion-resistant coatings. Although these methods can alleviate erosion to some extent, these measures often have limitations, such as expensive corrosion-resistant materials and coatings, or insufficient service life. To more effectively manage and maintain the pipelines containing ammonium chloride solution in chemical plants, it is necessary to monitor the erosion conditions in the pipeline in real time. The measured erosion rate as a key monitoring indicator, its accuracy and real-time directly related to the accurate prediction of erosion trends and the timely implementation of preventive measures. This not only grasps the current state of the pipeline, but also predicts potential risks.

[0004] In the publication No. CN108051286A "A pipeline inner wall erosion and wear detection device", by controlling the driving assembly to drive the frame to move along the length direction of the pipeline inner cavity, the ultrasonic detection assembly detects the pipeline inner cavity wall; but the above detection device is mainly suitable for detecting and evaluating the erosion and wear of existing pipelines, and is difficult to be used for studying the erosion process, predicting the erosion trend, or guiding the pipeline design and maintenance, etc. SUMMARY

[0005] In order to overcome the defects in the prior art, a U-shaped pipeline gas-liquid erosion experimental device and an operating method thereof are provided.

[0006] The technical solution of the present application is as follows: a U-shaped pipeline gas-liquid erosion experimental device, comprising a gas phase injection system, a liquid phase injection system and an erosion device connected with the pipeline; the gas phase injection system is used for injecting gas into the pipeline; the liquid phase injection system is used for injecting ammonium chloride solution into the pipeline, and the end of the liquid phase injection system is equipped with an atomizing nozzle; the erosion device is equipped with a U-shaped sample pipe for erosion experiment; the erosion device is equipped with a data collection and processing system.

[0007] As preferred, the gas phase injection system comprises an air compressor, a check valve, a buffer tank, a first flow regulating valve, a pressure gauge and a first flow meter connected in sequence; the check valve, the buffer tank and the first flow regulating valve are used to control the flow of the gas, and the pressure gauge and the first flow meter are used to detect the pressure and flow of the gas.

[0008] As preferred, the liquid phase injection system comprises a stirred water tank, a water pump, a second flow regulating valve and a second flow meter connected in sequence; the second flow regulating valve is used to control the flow of the ammonium chloride solution into the pipeline, and the second flow meter is used to measure the flow of the ammonium chloride droplets in the injection pipeline.

[0009] As preferred, the erosion device comprises a transparent fixed frame and two transparent pipe segments; the two transparent pipe segments are respectively assembled on the inlet hole and the outlet hole provided on one side of the transparent fixed frame.

[0010] As preferred, the transparent fixed frame is provided with a U-shaped groove and a U-shaped channel, the U-shaped channel is fixed in the transparent fixed frame through the U-shaped groove, and the U-shaped sample pipe is fixed in the U-shaped channel.

[0011] As preferred, a potentiometer for measuring the erosion rate of the U-shaped sample pipe in real time is assembled on the U-shaped sample pipe, and a terminal post is provided between the potentiometer and the U-shaped sample pipe.

[0012] As preferred, the atomizing nozzle is detachably assembled on the pipeline between the first flow meter and the inlet hole; the atomizing nozzle can atomize the ammonium chloride solution into droplets and inject them into the pipeline.

[0013] As preferred, the data collection and processing system comprises a computer, a synchronizer, a first light, a second light and a camera, the first light and the second light are respectively arranged on both sides of the transparent pipe segment; the camera is arranged beside the transparent fixed frame; the synchronizer is electrically connected with the computer, and is used to synchronize the photos taken by the camera to the computer for data processing.

[0014] As preferred, it further comprises a gas-liquid separator for separating the gas-liquid mixture after erosion, the gas flows out from the outlet provided above the gas-liquid separator, and the ammonium chloride solution flows into the stirred water tank from the outlet provided below the gas-liquid separator.

[0015] The second part is an operation method of the U-shaped pipeline gas-liquid erosion experimental device, comprising the following steps:

[0016] S1, assemble the experimental device, connect the gas phase injection system, the liquid phase injection system, the erosion device and the data collection and processing system into a complete experimental device, and install the U-shaped sample pipe for experiment in the erosion device;

[0017] S2, start the air compressor and water pump, adjust the first flow regulating valve and the second flow regulating valve, control the flow of gas and ammonium chloride solution, and make the gas-liquid mixture flow in the pipeline;

[0018] S3, use the camera to take photos of the flow state of the transparent straight pipe section at the inlet hole and the outlet hole and in the transparent fixed frame, and synchronize the taken photos to the computer through the synchronizer; use the potentiostat to measure the erosion rate of each part of the U-shaped sample pipe in real time;

[0019] S4, according to the experimental needs, replace different U-shaped sample pipes, repeat S2 to S3, to study the erosion effect of ammonium chloride solution on U-shaped sample pipes of different materials and measure the erosion rate.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] A U-shaped pipe gas-liquid erosion experimental device has high detection precision, can accurately control the injection conditions of gas phase and liquid phase through the gas phase injection system and the liquid phase injection system, has wide applicability, can experimentally study the influence of different ammonium chloride solution concentrations and air flow rates on pipe erosion, helps to reveal the mechanism and rules of the erosion process, identify and prevent erosion problems, and also provides a scientific basis for the design and maintenance of the pipeline; and the atomizing nozzle enables the ammonium chloride solution to be more uniformly distributed and impact the pipe wall, improving the accuracy of the experiment.

[0022] Further, the detailed configuration of the gas phase injection system ensures stable supply and accurate control of the gas, which helps to study the influence of different gas flow rates and pressures on the erosion process.

[0023] Further, the detailed configuration of the liquid phase injection system allows accurate control of the flow rate of the ammonium chloride solution, so that the erosion effect of the solution under different flow rates can be studied, and the flow rate of the ammonium chloride droplets injected into the pipeline is measured, improving the accuracy and reliability of the experiment.

[0024] Further, the erosion device uses a transparent fixed frame and pipe section, so that the experimental personnel can directly observe the flow state of the gas-liquid mixture in the pipeline and the erosion of the U-shaped sample pipe, which helps to monitor the erosion process.

[0025] Further, the U-shaped groove and U-shaped channel in the transparent fixed frame are designed to fix the U-shaped sample pipe, ensuring its stability and accuracy during the experiment, and improving the reliability of the experimental results.

[0026] Further, the potentiostat is used to measure the erosion rate of each part of the U-shaped sample pipe in real time, so that the erosion data can be accurately obtained, providing an important basis for analyzing the erosion mechanism and evaluating the erosion resistance of the material.

[0027] Further, the detachable design of the atomizing nozzle allows the experimenter to choose whether to atomize the ammonium chloride solution into droplets and inject it into the pipeline according to the needs, thereby simulating different erosion environments and enhancing the flexibility and applicability of the experiment.

[0028] Further, the configuration of the data collection and processing system allows real-time collection, synchronization and processing of experimental data, improving experimental efficiency and data accuracy and helping to quickly obtain experimental results.

[0029] Further, the arrangement of the gas-liquid separator ensures effective separation of the gas-liquid mixture after erosion, avoids pollution of the experimental environment, and realizes recycling of the ammonium chloride solution, improving resource utilization efficiency.

[0030] An operating method of a U-shaped pipeline gas-liquid erosion experimental device, which describes in detail the whole process from assembling the experimental device to obtaining experimental data, ensures the standardization and repeatability of the experiment, helps to share experimental results among different researchers, and promotes the research progress in the field of gas-liquid erosion; the operating steps are simple, the phenomena are obvious and easy to observe directly, and the experimental efficiency is improved.

[0031] Other features and advantages of the present application will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0032] The present application will be further described below in conjunction with the drawings:

[0033] Figure 1 Fig. 1 is a system structure schematic diagram of a U-shaped pipeline gas-liquid erosion experimental device of the present application;

[0034] Figure 2 Fig. 2 is a structure schematic diagram of a U-shaped pipeline gas-liquid erosion experimental device of the present application;

[0035] Figure 3 Fig. 3 is a structure schematic diagram of a U-shaped sample tube of the present application;

[0036] Figure 4 Fig. 4 is a structure schematic diagram of an erosion device of the present application;

[0037] The reference signs are explained as follows:

[0038] Gas injection system 1, liquid injection system 2, erosion device 3, pipeline 4, atomizing nozzle 5, U-shaped sample tube 6, data collection and processing system 7, gas-liquid separator 8, air compressor 11, check valve 12, buffer tank 13, first flow regulating valve 14, pressure gauge 15, first flow meter 16, stirred water tank 21, water pump 22, second flow regulating valve 23, second flow meter 24, transparent fixing frame 31, transparent pipe section 32, inlet hole 311, outlet hole 312, U-shaped groove 313, U-shaped channel 314, terminal post 61, computer 71, synchronizer 72, first light 73, second light 74, camera 75. DETAILED DESCRIPTION

[0039] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. The following embodiments are only preferred embodiments of the present application, and not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0040] In the following description, the appearance of terms such as "inner", "outer", "upper", "lower", "left", "right", etc. only indicates the orientation or positional relationship for the convenience of describing the embodiments and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0041] As shown in Figures 1 to 4 A U-shaped pipeline gas-liquid erosion experimental device, including a pipeline 4 connected gas injection system 1, liquid injection system 2 and erosion device 3; the gas injection system 1 is used for injecting gas into the pipeline 4, the liquid injection system 2 is used for injecting ammonium chloride solution into the pipeline 4, and the end of the liquid injection system 2 is equipped with an atomizing nozzle 5; the erosion device 3 is equipped with a U-shaped sample tube 6 for erosion experiment; the data collection and processing system 7 is equipped beside the erosion device 3.

[0042] The gas injection system 1 includes an air compressor 11, a check valve 12, a buffer tank 13, a first flow regulating valve 14, a pressure gauge 15 and a first flow meter 16 connected in sequence; the check valve 12, the buffer tank 13 and the first flow regulating valve 14 are used to control the flow of gas, and the pressure gauge 15 and the first flow meter 16 are used to detect the pressure and flow of gas. The air compressor 11 injects air into the pipeline, the check valve 12 prevents air from flowing back in the straight pipe section, and the buffer tank 13 makes the outflow of air more stable; the inflowing air passes through the first flow regulating valve 14 to control the flow into the pipeline system, and the pressure gauge 15 and the first flow meter 16 obtain the specific values of the pressure and air flow in the pipeline.

[0043] The liquid phase injection system 2 comprises a stirring water tank 21, a water pump 22, a second flow regulating valve 23 and a second flow meter 24 connected in sequence; the second flow regulating valve 23 is used to control the flow of the ammonium chloride solution into the pipeline 4, and the second flow meter 24 is used to measure the flow of the ammonium chloride liquid drops in the injection pipeline 4. The stirring water tank 21 contains the ammonium chloride solution, which passes through the water pump 22, the second flow regulating valve 23 and the second flow meter 24, and the atomizing nozzle 5 is detachably assembled on the pipeline 4 between the first flow meter 16 and the inlet hole 311; the atomizing nozzle 5 can atomize the ammonium chloride solution into liquid drops and inject them into the pipeline 4; after the atomizing nozzle 5 is removed, the ammonium chloride solution is directly injected into the pipeline 4; further, the second flow meter 24 obtains the flow of the ammonium chloride solution.

[0044] The erosion device 3 comprises a transparent fixed frame 31 and two transparent pipe sections 32; the two transparent pipe sections 32 are respectively assembled on the inlet hole 311 and the outlet hole 312 provided on one side of the transparent fixed frame 31. The transparent fixed frame 31 is provided with a U-shaped groove 313 and a U-shaped channel 314; the U-shaped channel 314 is fixed in the transparent fixed frame 31 through the U-shaped groove 313, and the U-shaped sample tube 6 is fixed in the U-shaped channel 314.

[0045] The U-shaped sample tube 6 is provided with a potentiometer for measuring the erosion rate of each part of the U-shaped sample tube 6 in real time; a terminal post 61 is provided between the potentiometer and the U-shaped sample tube 6.

[0046] The gas phase and the liquid phase are mixed in front of the transparent pipe section 32, flow into the erosion device 3 from the inlet hole 311, cause erosion to the U-shaped sample tube 6, and then flow out from the transparent pipe section 32 at the outlet hole 312. Since the transparent fixed frame 31 in the erosion device 3 is made of transparent material, the first light 73, the second light 74 and the camera 75 can be used to observe the flow characteristics of the multiphase flow in the transparent pipe section 32 and the transparent fixed frame 31. The gas-liquid mixture flows out of the gas-liquid separator 8, and the ammonium chloride solution flows into the stirring water tank 21 from the outlet provided below the gas-liquid separator 8.

[0047] The data collection and processing system 7 comprises a computer 71, a synchronizer 72, a first light 73, a second light 74 and a camera 75; the first light 73 and the second light 74 are respectively arranged on both sides of the transparent pipe section 32; the camera 75 is arranged beside the transparent fixed frame 31; the synchronizer 72 is electrically connected with the computer 71, and is used to synchronize the photos taken by the camera 75 to the computer 71 for data processing.

[0048] As Figure 3 , Figure 4As shown, the U-shaped sample tube 6 is installed in the U-shaped channel 314, and the four right angles of the transparent fixed frame 31 are fixed by bolts. The U-shaped sample tube 6 is welded with a plurality of cylindrical connecting posts 61 at intervals of 20°, and the connecting posts 61 are connected with a potentiostat for real-time measurement. Since the transparent fixed frame 31 is detachable, the erosion rate of different materials can be measured. The detection is performed by a linear polarization resistance method, which is an electrochemical detection method based on the Stern-Gerlach formula, wherein the potentiostat is a PS-1 potentiostat.

[0049] An operating method of a U-shaped pipeline gas-liquid erosion experimental device, comprising the following steps:

[0050] S1, assembling the experimental device, connecting the gas phase injection system 1, the liquid phase injection system 2, the erosion device 3 and the data collection and processing system 7 into a complete experimental device, and installing the U-shaped sample tube 6 for performing experiments in the erosion device 3.

[0051] S2, starting the air compressor 11 and the water pump 22, adjusting the first flow regulating valve 14 and the second flow regulating valve 23, controlling the flow of gas and ammonium chloride solution, and making the gas-liquid mixture flow in the pipeline 4.

[0052] Specific operations are as follows: a three-way joint is installed at the lower end of the second flow meter 24, which is used to install the pipeline 4 connecting the atomizing nozzle 5, the first flow meter 16 and the transparent pipe section 32 at the inlet hole 311; the air compressor 11, the check valve 12 and the first flow regulating valve 14 are started to let the air enter the pipeline 4, and the pressure and air flow in the pipeline are obtained through the pressure gauge 15 and the first flow meter 16, and the first flow regulating valve 14 adjusts the flow of the entering air. Then, the stirring water tank 21, the water pump 22 and the second flow regulating valve 23 are started, the flow of the injected ammonium chloride solution is adjusted through the second flow regulating valve 23, and the flow of the injected ammonium chloride solution is obtained through the second flow meter 24. The ammonium chloride solution is atomized into droplets by the atomizing nozzle 5 and injected into the pipeline 4. The ammonium chloride droplets and the air are mixed before the transparent pipe section 32 at the inlet hole 311 to form a gas-liquid mixture. The gas-liquid mixture enters the erosion device 3 through the transparent pipe section 32 and erodes the U-shaped sample tube 6. The gas-liquid mixture flows out of the transparent pipe section 32 at the outlet hole 312 and enters the gas-liquid separation tank 8. Gas-liquid separation is performed in the gas-liquid separation tank 8, the gas phase flows out of the upper outlet of the separation tank, and the liquid phase flows into the stirring water tank 21 from the lower outlet, and the liquid is reused.

[0053] S3, turn on the first light 73 and the second light 74 to make the surrounding environment bright, use the camera 75 to take photos of the flow state of the gas-liquid mixture in the transparent tube segment 32 and the transparent fixed frame 31 at the inlet hole 311 and the outlet hole 312, and synchronize the taken photos to the computer 71 through the synchronizer 72; start the potentiostat, place multiple working electrodes on the binding post 61, and connect them with a reference electrode and a counter electrode respectively. Real-time measurement of the erosion rate of each part of the U-shaped sample tube 6; multi-point measurement provides more comprehensive data, and comparison of the erosion rates of different areas helps to identify the erosion characteristics and increase the measurement accuracy.

[0054] S4, according to the experimental needs, replace different U-shaped sample tubes 6, repeat S2 to S3, to study the erosion effect of the ammonium chloride solution on the U-shaped sample tubes 6 of different materials and measure the erosion rate.

[0055] After the test is completed, turn off the potentiostat, the first light 73 and the second light 74, and the camera 75, then turn off the water pump 22, the second flow regulating valve 23, and after the outlet below the gas-liquid separator 8 is no longer flowing with solution, turn off the air compressor 11, and after the gas in the buffer tank 13 is completely discharged, turn off the first flow regulating valve 14 and the check valve 12.

[0056] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Those skilled in the art should understand that the present application includes but is not limited to the contents described in the above specific embodiments and the accompanying drawings. Any modification that does not deviate from the functional and structural principles of the present application shall be included in the scope of the claims.

Claims

1. A U-shaped pipe gas-liquid erosion experiment device, characterized in that: The gas phase injection system (1), the liquid phase injection system (2) and the erosion device (3) are connected with the pipeline (4); the gas phase injection system (1) is used for injecting gas into the pipeline (4); the liquid phase injection system (2) is used for injecting ammonium chloride solution into the pipeline (4), and the tail end of the liquid phase injection system (2) is provided with an atomizing nozzle (5); the erosion device (3) is provided with a U-shaped sample tube (6) for conducting erosion experiments; the data collection and processing system (7) is arranged on the erosion device (3); the erosion device (3) comprises a transparent fixed frame (31) and two transparent pipe sections (32); the two transparent pipe sections (32) are arranged on the inlet hole (311) and the outlet hole (312) provided on one side of the transparent fixed frame (31) respectively; the transparent fixed frame (31) is provided with a U-shaped groove (313) and a U-shaped channel (314), the U-shaped channel (314) is fixed in the transparent fixed frame (31) through the U-shaped groove (313), and the U-shaped sample tube (6) is fixed in the U-shaped channel (314); a potentiometer for measuring the erosion rate of the U-shaped sample tube (6) in real time is arranged on the U-shaped sample tube (6), and a connecting post (61) is arranged between the potentiometer and the U-shaped sample tube (6); the atomizing nozzle (5) is detachably arranged on the pipeline (4) between the first flow meter (16) and the inlet hole (311); the atomizing nozzle (5) atomizes the ammonium chloride solution into droplets and injects the droplets into the pipeline (4); the data collection and processing system (7) comprises a computer (71), a synchronizer (72), a first light (73), a second light (74) and a camera (75); the first light (73) and the second light (74) are arranged on the two sides of the transparent pipe section (32) respectively; the camera (75) is arranged beside the transparent fixed frame (31); the synchronizer (72) is electrically connected with the computer (71) and is used for synchronizing the photos taken by the camera (75) to the computer (71) for data processing.

2. The U-shaped pipe gas-liquid erosion experimental device according to claim 1, characterized in that: The gas phase injection system (1) comprises an air compressor (11), a check valve (12), a buffer tank (13), a first flow regulating valve (14), a pressure gauge (15) and a first flow meter (16) connected in sequence; the check valve (12), the buffer tank (13) and the first flow regulating valve (14) are used for controlling the flow of gas, and the pressure gauge (15) and the first flow meter (16) are used for detecting the pressure and flow of gas.

3. The U-shaped pipe gas-liquid erosion experimental device according to claim 2, characterized in that: The liquid phase injection system (2) comprises a stirring water tank (21), a water pump (22), a second flow regulating valve (23) and a second flow meter (24) connected in sequence; the second flow regulating valve (23) is used for controlling the flow of ammonium chloride solution into the pipeline (4), and the second flow meter (24) is used for measuring the flow of ammonium chloride droplets injected into the pipeline (4).

4. The U-shaped pipe gas-liquid erosion experimental device according to claim 3, characterized in that: The gas-liquid separator (8) is further arranged, which is used for separating the gas-liquid mixture after erosion, the gas flows out from the outlet provided above the gas-liquid separator (8), and the ammonium chloride solution flows into the stirring water tank (21) from the outlet provided below the gas-liquid separator (8).

5. A method of operating a U-bend pipe gas-liquid erosion experiment device, characterized in that: The application is suitable for a U-shaped pipeline gas-liquid erosion experimental device as claimed in claim 4, and comprises the following steps: S1, assembling the experimental device, connecting the gas phase injection system (1), the liquid phase injection system (2), the erosion device (3) and the data collection and processing system (7) into a complete experimental device, and installing the U-shaped sample pipe (6) for experiments in the erosion device (3); S2, starting the air compressor (11) and the water pump (22), adjusting the first flow regulating valve (14) and the second flow regulating valve (23), controlling the flow of the gas and the ammonium chloride solution, and making the gas-liquid mixture flow in the pipeline (4); S3, using the camera (75) to shoot the flow state of the transparent pipe section at the inlet hole (311) and the outlet hole (312) and the transparent fixing frame (31) of the gas-liquid mixture, and synchronizing the shot photos to the computer (71) through the synchronizer (72); using the potentiometer to measure the erosion rate of each part of the U-shaped sample pipe (6) in real time; S4, according to the experimental requirements, replacing different U-shaped sample pipes (6), repeating S2 to S3, so as to study the erosion effect of the ammonium chloride solution on the U-shaped sample pipes (6) made of different materials and measure the erosion rate.

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