U-shaped pipeline gas-liquid erosion experimental device and operation method thereof

Abstract

The invention discloses a gas-liquid erosion experimental device for a U-shaped pipeline. The gas-liquid erosion experimental device comprises a gas phase injection system, a liquid phase injection system and an erosion device which are 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 an ammonium chloride solution into the pipeline, and an atomizing nozzle is assembled at the tail end of the liquid phase injection system; a U-shaped sample tube for carrying out an erosion experiment is assembled in the erosion device; a data collecting and processing system is assembled on the erosion device; the detection precision is high, and the injection conditions of a gas phase and a liquid phase can be accurately controlled through the gas phase injection system and the liquid phase injection system; the applicability is wide, and the influence on pipeline erosion under different ammonium chloride solution concentrations and air flows can be tested; operation steps are simple, phenomena are obvious, direct observation is facilitated, and experiment efficiency is improved.

Description

Technical Field

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

[0002] In the chemical production process, the integrity and safety of the pipeline system are crucial, especially when dealing with corrosive media such as ammonium chloride solution. Ammonium chloride is present in many chemical plants, such as hydrogenation plants. When ammonium chloride is dissolved in water, it will form a corrosive acidic environment, which can easily cause the inner wall material of the pipeline to be corroded, thereby causing erosion of the pipeline wall, pipeline leakage, equipment damage, and even triggering safety accidents.

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

[0004] In the "A pipeline inner wall erosion and wear detection device" disclosed in publication number CN108051286A, the control unit controls the driving component to drive the frame to move along the length direction of the pipeline inner cavity, and controls the ultrasonic detection component to detect the pipeline inner cavity wall; however, 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 pipeline design and maintenance. Summary of the invention

[0005] In order to overcome the above-mentioned 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 invention 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 to the pipeline; the gas phase injection system is used to inject gas into the pipeline; the liquid phase injection system is used to inject 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 tube for erosion experiment; and the erosion device is equipped with a data collection and processing system.

[0007] Preferably, the gas phase injection system includes 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] Preferably, the liquid phase injection system includes a stirring 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 rate of ammonium chloride solution entering the pipeline, and the second flow meter is used to measure the flow rate of ammonium chloride droplets injected into the pipeline.

[0009] Preferably, the erosion device comprises a transparent fixing frame and two transparent pipe sections; the two transparent pipe sections are respectively assembled on an inlet hole and an outlet hole provided on one side of the transparent fixing frame.

[0010] Preferably, a U-shaped groove and a U-shaped channel are provided in the transparent fixing frame, the U-shaped channel is fixed in the transparent fixing frame through the U-shaped groove, and the U-shaped sample tube is fixed in the U-shaped channel.

[0011] Preferably, the U-shaped sample tube is equipped with a potentiometer for real-time measurement of the erosion rate of the U-shaped sample tube, and a terminal is provided between the potentiometer and the U-shaped sample tube.

[0012] Preferably, the atomizing nozzle is detachably mounted on the pipe 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 pipe.

[0013] Preferably, the data collection and processing system includes a computer, a synchronizer, a first light, a second light and a camera, wherein the first light and the second light are respectively arranged on both sides of the transparent tube section; the camera is arranged next to the transparent fixed frame; the synchronizer is connected to the computer electrical signal for synchronizing the photos taken by the camera to the computer for data processing.

[0014] Preferably, a gas-liquid separator is further included to separate the gas-liquid mixture after erosion, the gas flows out from an outlet provided above the gas-liquid separator, and the ammonium chloride solution flows into the stirring water tank from an outlet provided below the gas-liquid separator.

[0015] Part II, an operation method of a U-shaped pipeline gas-liquid erosion experimental device, comprising the following steps: S1. Assemble the experimental device, connect the gas phase injection system, liquid phase injection system, erosion device and data collection and processing system into a complete experimental device, and install a U-shaped sample tube for the experiment in the erosion device; S2, start the air compressor and the water pump, adjust the first flow regulating valve and the second flow regulating valve, control the flow of the gas and the ammonium chloride solution, and make the gas-liquid mixture flow in the pipeline; S3, using a camera to photograph the flow state of the gas-liquid mixture in the transparent straight tube section at the inlet and outlet holes and in the transparent fixed frame, and synchronizing the photographed photos to a computer through a synchronizer; using a potentiometer to measure the erosion rate of each part of the U-shaped sample tube in real time; S4. According to experimental needs, replace different U-shaped sample tubes and repeat S2 to S3 to study the erosion effect of ammonium chloride solution on U-shaped sample tubes of different materials and measure the erosion rate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: A U-shaped pipeline gas-liquid erosion experimental device has high detection accuracy. The injection conditions of the gas phase and the liquid phase can be accurately controlled through a gas phase injection system and a liquid phase injection system. The device has wide applicability and can experiment the influence of different ammonium chloride solution concentrations and air flow rates on pipeline erosion, which helps to reveal the mechanism and law of the erosion process, identify and prevent erosion problems, and provide a scientific basis for the design and maintenance of pipelines. In addition, an atomizing nozzle enables the ammonium chloride solution to be more evenly distributed and impact the pipeline wall, thereby improving the accuracy of the experiment.

[0017] Furthermore, the detailed configuration of the gas injection system ensures a stable supply and precise control of the gas, which helps to study the effects of different gas flow rates and pressures on the erosion process.

[0018] Furthermore, the detailed configuration of the liquid injection system allows the flow rate of the ammonium chloride solution to be precisely controlled, so that the erosion effect of the solution at different flow rates can be studied, while the flow rate of the ammonium chloride droplets in the injection pipeline can be measured, which improves the accuracy and reliability of the experiment.

[0019] Furthermore, the erosion device uses a transparent fixed frame and pipe section, so that the experimenter can visually observe the flow state of the gas-liquid mixture in the pipeline and the erosion of the U-shaped sample tube, which helps to monitor the erosion process.

[0020] Furthermore, the U-shaped groove and the U-shaped channel in the transparent fixing frame are designed to fix the U-shaped sample tube, thereby ensuring its stability and accuracy during the experiment and improving the reliability of the experimental results.

[0021] Furthermore, by measuring the erosion rate of each part of the U-shaped sample tube in real time with a potentiometer, the erosion data can be accurately obtained, providing an important basis for analyzing the erosion mechanism and evaluating the erosion resistance of the material.

[0022] Furthermore, 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 as needed, thereby simulating different erosion environments and enhancing the flexibility and applicability of the experiment.

[0023] Furthermore, the configuration of the data collection and processing system enables the real-time collection, synchronization and processing of experimental data, which improves experimental efficiency and data accuracy and helps to quickly obtain experimental results.

[0024] Furthermore, the provision of a gas-liquid separator ensures that the gas-liquid mixture after erosion is effectively separated, thereby avoiding pollution of the experimental environment, and at the same time realizing the recycling of the ammonium chloride solution, thereby improving the utilization efficiency of resources.

[0025] An operating method for a U-shaped pipeline gas-liquid erosion experimental device is disclosed. The method 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 research progress in the field of gas-liquid erosion. The operating steps are simple, the phenomenon is obvious and easy to observe directly, and the experimental efficiency is improved.

[0026] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 A schematic diagram of the system structure of a U-shaped pipeline gas-liquid erosion experimental device of the present invention; Figure 2 It is a structural schematic diagram of a U-shaped pipeline gas-liquid erosion experimental device of the present invention; Figure 3 It is a structural schematic diagram of a U-shaped sample tube of the present invention; Figure 4 It is a schematic structural diagram of the erosion device of the present invention; The following are the descriptions of the reference numerals: Gas phase injection system 1, liquid phase 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, stirring 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 61, computer 71, synchronizer 72, first light 73, second light 74, camera 75. DETAILED DESCRIPTION

[0028] The technical solutions of the embodiments of the present invention are explained and described below in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the present invention.

[0029] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operate in a specific direction. Therefore, it should not be understood as a limitation of the present invention.

[0030] like Figures 1 to 4 As shown, a U-shaped pipeline gas-liquid erosion experimental device comprises a gas phase injection system 1, a liquid phase injection system 2 and an erosion device 3 connected by a pipeline 4; the gas phase injection system 1 is used to inject gas into the pipeline 4, the liquid phase injection system 2 is used to inject ammonium chloride solution into the pipeline 4, and the end of the liquid phase 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; and a data collection and processing system 7 is installed next to the erosion device 3.

[0031] 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 which are 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 the gas, and the pressure gauge 15 and the first flow meter 16 are used to detect the pressure and flow of the gas. The air compressor 11 injects air into the pipeline, the check valve 12 prevents the air from flowing back in the straight pipe section, and the buffer tank 13 makes the outflowing air more stable; the inflowing air controls the flow rate injected into the pipeline system through the first flow regulating valve 14, and the pressure gauge 15 and the first flow meter 16 obtain the specific values ​​of the pressure in the pipeline and the air flow rate.

[0032] The liquid phase injection system 2 includes 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 entering the pipeline 4, and the second flow meter 24 is used to measure the flow of the ammonium chloride droplets injected into the pipeline 4. The stirring water tank 21 contains an ammonium chloride solution, and the ammonium chloride solution passes through the water pump 22, the second flow regulating valve 23 and the second flow meter 24. The atomizing nozzle 5 can be 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 droplets 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.

[0033] The erosion device 3 includes a transparent fixing frame 31 and two transparent tube segments 32; the two transparent tube segments 32 are respectively assembled on one side of the transparent fixing frame 31 and are provided with an inlet hole 311 and an outlet hole 312. The transparent fixing 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 fixing frame 31 through the U-shaped groove 313, and the U-shaped sample tube 6 is fixed in the U-shaped channel 314.

[0034] The U-shaped sample tube 6 is equipped with a potentiometer for real-time measurement of the erosion rate of each part of the U-shaped sample tube 6 , and a terminal 61 is provided between the potentiometer and the U-shaped sample tube 6 .

[0035] After the gas phase and the liquid phase are mixed in front of the transparent tube section 32, they flow into the erosion device 3 from the inlet hole 311, erode the U-shaped sample tube 6, and then flow out from the transparent tube section 32 at the outlet hole 312. Since the transparent fixing 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 multiphase flow characteristics in the transparent tube section 32 and the transparent fixing frame 31. The outflowing gas-liquid mixture is separated in the gas-liquid separator 8, the gas flows out from the outlet provided at the top of the gas-liquid separator 8, and the ammonium chloride solution flows into the stirring water tank 21 from the outlet provided at the bottom of the gas-liquid separator 8.

[0036] The data collection and processing system 7 includes 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 tube section 32; the camera 75 is arranged next to the transparent fixed frame 31; the synchronizer 72 is connected to the computer 71 by electrical signals, and is used to synchronize the photos taken by the camera 75 to the computer 71 for data processing.

[0037] like Figure 3 , Figure 4 As shown, the U-shaped sample tube 6 is installed in the U-shaped channel 314, and the four right angles of the transparent fixing frame 31 are fixed with bolts. The U-shaped sample tube 6 is welded with multiple cylindrical terminals 61 every 20°, and the terminals 61 are connected to a potentiometer for real-time measurement. Since the transparent fixing frame 31 is detachable, the erosion rate of different materials can be measured. The detection is performed by the linear polarization resistance method, which is an electrochemical detection method based on the Stern-Geely formula, wherein the potentiometer adopts a PS-1 type potentiometer.

[0038] An operating method of a U-shaped pipeline gas-liquid erosion experimental device comprises the following steps: S1. Assemble the experimental device, connect the gas injection system 1, the liquid injection system 2, the erosion device 3 and the data collection and processing system 7 into a complete experimental device, and install a U-shaped sample tube 6 for conducting experiments in the erosion device 3.

[0039] S2, start the air compressor 11 and the water pump 22, adjust the first flow regulating valve 14 and the second flow regulating valve 23, control the flow of the gas and the ammonium chloride solution, and make the gas-liquid mixture flow in the pipeline 4.

[0040] The specific operation is as follows: a three-way connector is installed at the lower end of the second flowmeter 24 to install the pipeline 4 connecting the atomizing nozzle 5, the first flowmeter 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 allow air to enter the pipeline 4, and the pressure and air flow in the pipeline are obtained through the pressure gauge 15 and the first flowmeter 16, and the first flow regulating valve 14 adjusts the incoming air flow. Then, the stirring water tank 21, the water pump 22, and the second flow regulating valve 23 are started, and the flow of the injected ammonium chloride solution is adjusted through the second flow regulating valve 23, and the second flowmeter 24 obtains the flow of the injected ammonium chloride solution. The ammonium chloride solution is atomized into droplets through the atomizing nozzle 5 and injected into the pipeline 4. The ammonium chloride droplets and the air are mixed in front of 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 with the U-shaped sample tube 6. The gas-liquid mixture flows out from 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 from 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.

[0041] S3. Turn on the first light 73 and the second light 74 to make the surrounding environment bright, use the camera 75 to photograph the flow state of the gas-liquid mixture in the transparent tube section 32 at the inlet hole 311 and the outlet hole 312 and the transparent fixing frame 31, and synchronize the photographed photos to the computer 71 through the synchronizer 72; start the potentiometer, place multiple working electrodes on the terminal 61, and connect them to the same reference electrode and counter electrode respectively. Measure the erosion rate of each part of the U-shaped sample tube 6 in real time; multi-point measurement provides more comprehensive data, compares the erosion rates of different areas, helps to identify the erosion characteristics, and increases the accuracy of measurement.

[0042] S4. According to experimental needs, replace different U-shaped sample tubes 6 and repeat S2 to S3 to study the erosion effect of ammonium chloride solution on U-shaped sample tubes 6 of different materials and measure the erosion rate.

[0043] After the test, turn off the potentiometer, the first light 73, the second light 74 and the camera 75, then turn off the water pump 22 and the second flow regulating valve 23. When no solution flows out of the outlet below the gas-liquid separator 8, turn off the air compressor 11. After the gas in the buffer tank 13 flows out completely, close the first flow regulating valve 14 and the check valve 12.

[0044] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification that does not deviate from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims

1. A U-shaped pipeline gas-liquid erosion experimental device, characterized in that: The invention comprises a gas phase injection system (1), a liquid phase injection system (2) and an erosion device (3) connected to a pipeline (4); the gas phase injection system (1) is used to inject gas into the pipeline (4); the liquid phase injection system (2) is used to inject ammonium chloride solution into the pipeline (4), and the end of the liquid phase injection system (2) is equipped with an atomizing nozzle (5); the erosion device (3) is equipped with a U-shaped sample tube (6) for performing an erosion experiment; and the erosion device (3) is equipped with a data collection and processing system (7).

2. A U-shaped pipeline 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) which are 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 the gas, and the pressure gauge (15) and the first flow meter (16) are used to detect the pressure and flow of the gas.

3. A U-shaped pipeline gas-liquid erosion experimental device according to claim 1, 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) which are connected in sequence; the second flow regulating valve (23) is used to control the flow rate of the ammonium chloride solution entering the pipeline (4), and the second flow meter (24) is used to measure the flow rate of the ammonium chloride droplets injected into the pipeline (4).

4. A U-shaped pipeline gas-liquid erosion experimental device according to claim 1, characterized in that: The erosion device (3) comprises a transparent fixing frame (31) and two transparent tube segments (32); the two transparent tube segments (32) are respectively mounted on an inlet hole (311) and an outlet hole (312) provided on one side of the transparent fixing frame (31).

5. A U-shaped pipeline gas-liquid erosion experimental device according to claim 4, characterized in that: The transparent fixing 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 fixing frame (31) via the U-shaped groove (313); and the U-shaped sample tube (6) is fixed in the U-shaped channel (314).

6. A U-shaped pipeline gas-liquid erosion experimental device according to claim 1 or 5, characterized in that: The U-shaped sample tube (6) is equipped with a potentiometer for real-time measurement of the erosion rate of the U-shaped sample tube (6), and a terminal (61) is provided between the potentiometer and the U-shaped sample tube (6).

7. The U-shaped pipeline gas-liquid erosion experimental device according to claim 1, characterized in that: The atomizing nozzle (5) is detachably mounted on the pipe (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 them into the pipe (4).

8. The U-shaped pipeline gas-liquid erosion experimental device according to claim 1, characterized in that: 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 both sides of the transparent tube section (32) respectively; the camera (75) is arranged beside the transparent fixed frame (31); the synchronizer (72) is connected to the computer (71) via an electrical signal and is used to synchronize the photos taken by the camera (75) to the computer (71) for data processing.

9. The U-shaped pipeline gas-liquid erosion experimental device according to claim 1, characterized in that: It also includes a gas-liquid separator (8) for separating the gas-liquid mixture after erosion, wherein the gas flows out from an outlet provided at the top of the gas-liquid separator (8), and the ammonium chloride solution flows into the stirring water tank (21) from an outlet provided at the bottom of the gas-liquid separator (8).

10. An operating method of a U-shaped pipeline gas-liquid erosion experimental device, characterized in that: A U-shaped pipeline gas-liquid erosion experimental device suitable for use in any one of claims 1 to 9, comprising the following steps: S1, assembling an experimental device, connecting a gas phase injection system (1), a liquid phase injection system (2), an erosion device (3) and a data collection and processing system (7) into a complete experimental device, and installing a U-shaped sample tube (6) for conducting 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 rates of the gas and the ammonium chloride solution, and allowing the gas-liquid mixture to flow in the pipeline (4); S3, using a camera (75) to photograph the flow state of the gas-liquid mixture in the transparent straight tube section at the inlet hole (311) and the outlet hole (312) and in the transparent fixed frame (31), and synchronizing the photographed photos to the computer (71) through a synchronizer (72); using a potentiometer to measure the erosion rate of each part of the U-shaped sample tube (6) in real time; S4. According to experimental requirements, replace different U-shaped sample tubes (6) and repeat S2 to S3 to study the erosion effect of ammonium chloride solution on U-shaped sample tubes (6) made of different materials and measure the erosion rate.

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