Multi-phase erosion corrosion coupling damaged pipeline simulation experiment testing system and method

Abstract

The invention discloses a multiphase erosion corrosion coupling damaged pipeline simulation experiment test system and method. Comprising a screw pump, a pressure measurement module, a high-pressure rubber expansion joint, a gas release module, a check valve, a special feeding module, a temperature control measurement module, a wall shear force measurement bin, a fluid acceleration module, a buffer tank, a pipeline pressurization module, a temperature sensor, an electric control cabinet and a copper pipe coil cooler which are arranged on a circulating pipeline. The problem that the gas-liquid / gas-liquid-solid multi-phase erosion and corrosion coupling damage rule and the predicted damage rate are difficult to test in a high-sulfur, high-chlorine and high-acid severe environment in a petrochemical chemical production device is solved, and the damage rate of the petrochemical chemical production device is predicted by designing a special feeding structure, a pressurizing structure, an accelerating structure, a constant temperature structure, an anti-corrosion structure, an anti-abrasion structure, an anti-vibration structure and other structures and a temperature, flow, concentration and pressure precise regulation and control system. Long-time stable operation and accurate measurement of multi-phase scouring and corrosion coupling damage are realized, and safety evaluation and risk prevention and control of complex flow-induced damage of a petrochemical chemical production device are effectively supported.

Description

Technical Field

[0001] The invention relates to the field of petrochemical chemical safety technology, and in particular to a multiphase erosion-corrosion coupling damage pipeline simulation experiment test system and method. Background Art

[0002] Petrochemical production facilities often have harsh environments with high sulfur, high chlorine and high acid, which lead to multiphase flow erosion corrosion damage and failure of equipment, pipelines and safety accessories, such as oil refining atmospheric and vacuum decompression, catalytic cracking units, chemical Claus / Consov desulfurization units, coal chemical coal indirect liquefaction coal gasification units, coal direct liquefaction coal to oil units, etc. How to predict the multiphase flow erosion corrosion damage law and damage rate, and guide the safe operation and maintenance of petrochemical production enterprises is an urgent need of the industry.

[0003] At present, there are many industrial pipeline multiphase erosion simulation test devices at home and abroad, but most of them are for oil and gas extraction and transportation environments. For foreign countries, typical ones include the multiphase flow pipeline device of Ohio University in the United States, which is suitable for long-distance pipeline oil and gas systems (gas-liquid / oil-gas / gas-liquid / liquid-solid two-phase), flow rate 0.1~20m / s, temperature 25~120℃, pressure 1000psi; the multiphase flow corrosion erosion pipeline device of Tulsa University in the United States is suitable for natural gas / oil and gas extraction pipeline systems (water-sand / oil-sand / liquid-solid two-phase), flow rate 0.1~30m / s, temperature 0~80℃, pressure 1000psi. For domestic countries, typical ones include the flow corrosion / erosion simulation experimental device of Beijing University of Science and Technology, which is suitable for oil and gas transmission pipeline systems (oil-water / gas-liquid-solid three-phase), flow rate 0.1~30m / s, temperature 0~100℃, pressure 2MPa, etc. The above mentioned flow corrosion erosion simulation test devices are not suitable for the harsh environment of high sulfur, high chlorine and high acid. There are also pipeline erosion test devices specially designed for the flow characteristics of petrochemical and chemical plants.

[0004] In summary, providing a strong corrosion, high-speed, high-pressure, multi-phase erosion-corrosion coupled damage pipeline simulation experimental testing system and method is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The purpose of the present invention is to provide a multiphase erosion-corrosion coupled damage pipeline simulation experiment test system and method to solve the problems existing in the above-mentioned prior art, so as to highly integrate and integrate multiple disciplines such as process, fluid, material, corrosion, and automatic control, and focus on solving the real simulation of the actual flow corrosion / erosion environment and conditions of chemical industry pipelines; precise control of stable flow state changes and operating parameters (temperature, pressure, concentration, flow rate, etc.); special feeding, pressurization, acceleration, constant temperature, anti-corrosion, anti-wear, anti-vibration and other structural designs, so as to ensure long-term stable operation of the device and realize precise measurement of multiphase erosion and corrosion coupled damage.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] The present invention provides a multiphase erosion-corrosion coupling damage pipeline simulation experiment test system, comprising a screw pump, a pressure measurement module, a high-pressure rubber expansion joint, a gas discharge module, a check valve, a special feeding module, a temperature control measurement module, a wall shear force measurement chamber, a fluid acceleration module, a buffer tank, a pipeline booster module, a temperature sensor, a concentration sensor, an electric control cabinet and a copper tube coil cooler arranged on a circulation pipeline;

[0008] The outlet of the screw pump is connected to one end of the pipeline, the inlet of the screw pump is connected to the other end of the pipeline, and the screw pump provides power for the fluid in the entire pipeline;

[0009] The high-pressure rubber expansion joint is arranged near the outlet of the screw pump, and can absorb system vibration and adapt to fluid pressure changes to ensure the stability of the system;

[0010] The gas discharge module is used to release and regulate the gas to avoid blockage of the gas in the pipeline resulting in poor flow;

[0011] The special feeding module is used to feed solid particles into the pipeline;

[0012] The temperature control and measurement module and the copper tube coil cooler are used to ensure the temperature stability of the fluid in the pipeline during transportation, prevent the change of fluid properties due to temperature changes, and achieve long-term stable operation of the system;

[0013] The fluid acceleration module can achieve a sharp increase in the fluid flow rate. It is equipped with a pressure transmitter and an electromagnetic flowmeter, which can monitor the pressure and flow in the pipeline in real time to ensure accurate monitoring of the flow and pressure during the experiment.

[0014] The buffer tank is used to store water required for the experiment;

[0015] The pipeline boosting module is used for boosting the pressure of the pipeline;

[0016] The temperature sensor is used to measure the temperature change of the entire system;

[0017] The concentration sensor is used to measure the pH value and solid volume fraction of the liquid in the pipeline.

[0018] Preferably, the pipeline is made of titanium alloy or nickel-based alloy or Hastelloy or double molybdenum stainless steel or ultra-low carbon stainless steel, and the material of the stator and rotor of the screw pump is the same as that of the pipeline.

[0019] Preferably, the pressure measurement module includes a plurality of pressure sensors, each of which is respectively arranged at the inlet and outlet of the screw pump, for real-time monitoring of the pressure changes of the fluid under different working conditions and monitoring of the operating pressure provided by the screw pump; the tank top and outlet of the gas discharge module are used to timely detect gas release and pipeline pressure fluctuations; the temperature control measurement module is used to monitor the pressure changes of the fluid during heating or cooling, so as to ensure the effectiveness of temperature control and timely detect abnormal conditions; the inlet and outlet of the fluid acceleration module are used to monitor the pressure changes of the fluid during the acceleration process, so as to evaluate the acceleration effect and optimize the fluid flow state; the pipeline boosting module is used to monitor the pressure changes during the boosting process in real time, to ensure that the boosting effect reaches the expected value, and to adjust the system parameters in time to maintain a stable pressure output.

[0020] Preferably, the high-pressure rubber expansion joint is arranged downstream of the outlet of the screw pump for connecting the screw pump with the pipeline, and the high-pressure rubber expansion joint is made of high-temperature resistant and corrosion-resistant polytetrafluororubber material.

[0021] Preferably, the gas release module is arranged downstream of the high-pressure rubber expansion joint, and the gas release module includes an air storage tank, a manual ball valve and a flow meter. The air storage tank is connected to the pipeline through an air pipe, and pressure sensors are arranged at the upper part and outlet position of the air storage tank. The manual ball valve is arranged on the air pipe to control the opening and closing of the air pipe, and the flow meter is arranged on the air pipe.

[0022] Preferably, the check valve is made of corrosion-resistant material and can withstand a pressure of up to 25 MPa. It includes check valve one, check valve two and check valve three. Check valve one is arranged near the inlet of the screw pump to ensure that the suction side of the screw pump always maintains a positive pressure and prevents cavitation caused by gas or liquid reflux, thereby extending the service life of the pump; check valve two is arranged downstream of the connection between the air pipe and the pipeline to ensure that the gas can only be discharged outward and prevent external fluid from flowing back into the pipeline, which can maintain the pressure balance inside the module, reduce the pressure fluctuation caused by reflux, and ensure the working efficiency and safety of the module; check valve three is arranged at the position of the pipeline boosting module to ensure that the pressurized fluid can only flow to the downstream system in one direction, prevent pressure loss caused by fluid reflux, ensure that the function of the boosting module is fully utilized, and avoid system failures caused by fluid reflux.

[0023] Preferably, the special feeding module is a U-shaped special feeding module or an L-shaped special feeding module, which is used for storing and discharging solid particles;

[0024] The U-shaped special feeding module includes a sand tank, a solid particle flow meter, a U-shaped connecting pipe, a clamp seal and an electric ball valve; the discharge ports at the front ends of the two discharge pipes of the U-shaped connecting pipe are connected to the pipeline, the discharge port of the sand tank is connected to the middle of the rear end of the U-shaped connecting pipe, the clamp seal is arranged at the top of the sand tank for sealing the tank body, the solid particle flow meter is arranged at the discharge port of the sand tank, and the electric ball valve is arranged on the two discharge pipes of the U-shaped connecting pipe;

[0025] The L-shaped special feeding module includes a sand tank, a solid particle flow meter, an L-shaped connecting pipe, a clamp seal and an electric ball valve; the front end discharge port of the L-shaped connecting pipe is connected to the pipeline, the discharge port of the sand tank is connected to the top of the L-shaped connecting pipe, the clamp seal is arranged on the top of the sand tank for sealing the tank body, and the solid particle flow meter and the electric ball valve are arranged on the L-shaped connecting pipe;

[0026] When the fluid passes through the special feeding module, the increase in flow rate causes the pressure in the pipeline to decrease, forming a local low-pressure area, thereby attracting solid particles into the pipeline; the signal of the solid particle flow meter is transmitted to the electric control cabinet in real time, and the electric control cabinet adjusts the opening of the electric ball valve to adjust the particle release rate.

[0027] Preferably, the temperature control and measurement module includes a constant power electric heating tape, a pressure sensor, a temperature sensor and an electromagnetic flowmeter, wherein the constant power electric heating tape is used for pipeline heating and is installed on the outside of the pipeline in a winding manner. The winding length of the constant power electric heating tape is 2m, and the winding spacing is within 20mm to ensure efficient heat transfer and ensure rapid heating of the pipeline fluid.

[0028] Preferably, the wall shear force measurement chamber includes a test chamber shell, a spiral lifting valve, a trapezoidal boss and a circular shear force sensor. The test chamber shell is installed on the outside of the pipeline. The test chamber shell is made of nickel-based alloy or Hastelloy and has a length of 400 mm. Five circular shear force sensors in contact with the outer wall of the pipeline are arranged on the top of the test chamber shell. Each of the circular shear force sensors is spaced 50 mm apart to ensure that the entire flow area can be covered and the shear force changes at different positions can be captured. The bottom of the test chamber shell is designed with a trapezoidal boss that can be lifted and lowered, which can effectively change the flow rate of the fluid in the measuring chamber, thereby adapting to various experimental environments and conditions. The spiral lifting valve is threadedly connected to the trapezoidal boss to control the lifting and lowering of the trapezoidal boss.

[0029] Preferably, the fluid acceleration module includes a test section shrink ring, an electromagnetic flowmeter, a pressure sensor, and concentration and pH parallel sensors; the test section shrink ring includes a solid double-conical inner core and an embedded sample installation groove that are relatively arranged, the solid double-conical inner core is shaped like a cylinder in the middle with cones at both ends, is supported by 8 cone-shaped inner core support bars, is suspended in the center of the pipeline, and forms an annular gap with the inner wall of the pipeline for fluid flow, the embedded sample installation groove is located inside the right side of the flange in the middle of the test section shrink ring and is an annular groove opened on the inner wall of the pipeline, It is used to install 12 curved square test pieces used for testing; 4 concentration and pH parallel sensors of different heights are arranged before and after the sudden shrinkage ring of the test section, which are located at different heights and connected to the PID controller of the electric control cabinet to ensure accurate monitoring of the pressure, concentration and pH of the test section; 2 electromagnetic flow meters and 2 pressure sensors are also installed before and after the sudden shrinkage ring of the test section to measure the flow rate and pressure of the fluid flowing through the sudden shrinkage ring of the test section, which can maintain measurement accuracy under high flow rate conditions to ensure accurate monitoring of the flow of the entire system.

[0030] Preferably, a U-shaped buffer boost pipeline is connected to the pipeline downstream of the fluid acceleration module, both ends of the buffer boost pipeline are respectively connected to the pipeline, and a manual ball valve is installed on the section of the pipeline connected to the buffer boost pipeline, the buffer tank is installed upstream of the buffer boost pipeline, and a check valve four and a manual ball valve are arranged on the pipeline at the inlet end of the buffer tank, and a liquid level monitoring device is installed on the buffer tank, which can monitor the water level changes in real time.

[0031] Preferably, the pipeline boosting module includes a boosting pump, which is arranged downstream of the buffer boosting pipeline. A manual ball valve is arranged on the buffer boosting pipeline at the inlet end of the boosting pump, and the check valve three is arranged on the buffer boosting pipeline at the outlet end of the boosting pump.

[0032] Preferably, the manual ball valve is made of corrosion-resistant material.

[0033] Preferably, the temperature sensor is installed at the temperature control and measuring module and also installed on the pipeline downstream of the boost module. The temperature sensor is used to measure the temperature change of the entire system, and cooperates with the temperature control and measuring module and the copper tube coil cooler to ensure accurate monitoring and control of the temperature of the entire system.

[0034] Preferably, a PID controller is arranged in the electric control cabinet, which can automatically adjust the rotation speed of the screw pump and the switch of the temperature control measurement module, the pipeline booster module, the special feeding module and the copper tube coil cooler according to the real-time pressure, temperature, flow and concentration data by collecting and processing the temperature, flow, concentration and pressure signals of each module, so as to form a closed-loop control system, maintain the stability of the system pressure, temperature, concentration and flow, and ensure that the system operates stably within the set range. The electric control cabinet is also provided with a touch screen or a display, which displays the working status and parameters of each module in real time, allowing the operator to manually adjust the settings, or select the automatic mode for the system to optimize and control itself.

[0035] Preferably, the copper tube coil cooler is installed on the upstream part of the screw pump and is linked to the temperature sensor of the temperature control measurement module. When working, the target temperature is set. When the fluid temperature exceeds the set value, the PID controller of the electrical control cabinet adjusts the coolant flow through the copper tube coil cooler according to real-time temperature feedback to ensure that the fluid temperature is stable within the set range.

[0036] Based on the above multiphase erosion-corrosion coupled damaged pipeline simulation experiment test system, the present invention also provides a multiphase erosion-corrosion coupled damaged pipeline simulation experiment test method, comprising the following steps:

[0037] Step 1: Check the sealing of valves and devices in the entire circulation pipeline;

[0038] Step 2: Install the wall shear force measurement chamber and the test section shrink ring on the main pipe;

[0039] Step 3: Fill the buffer tank with water and ensure that the water filling volume remains at about 2 / 3 by observing the liquid level gauge;

[0040] Step 4: Open the manual ball valve to allow the water in the buffer tank to flow into the pipeline, and close the ball valve after the water fills the entire pipeline;

[0041] Step 5: Open the ball valve switch of the booster pump, start the booster pump to pressurize the pipeline in the human-machine operation interface of the electric control cabinet, keep the boost flow rate at 0.5kg / h, observe the value of the pressure gauge, and when the pressure reaches 2MPa, stop the boost and close the ball valve of the booster pump;

[0042] Step 6: Start the screw pump on the human-machine interface of the electric control cabinet, adjust the frequency from 5Hz and gradually increase it to make the water in the pipeline flow, start the electric ball valve of the special feeding module, and let the particles enter the pipeline at a discharge rate of 1.5kg / h. When the particle concentration reaches the requirement, close the electric ball valve;

[0043] Step 7: Depending on whether the experiment is heating or cooling, turn on the constant power electric heating cable or copper tube coil cooler to keep the pipe temperature at around 30°;

[0044] Step 8: Adjust the flow rate of the pipeline equipment by changing the frequency of the screw pump to achieve the flow rate required for the experiment;

[0045] Step 9: After completing the test, drain the water and flush the pipes.

[0046] Compared with the prior art, the present invention has achieved the following technical effects:

[0047] To solve the problem of difficult testing of the damage law of gas-liquid / gas-liquid-solid multiphase erosion and corrosion coupling damage and predicting the damage rate in the harsh environment of high sulfur, high chlorine and high acid in petrochemical production equipment, by designing special feeding, pressurization, acceleration, constant temperature, anti-corrosion, anti-wear, anti-vibration and other structures, as well as precise control systems of temperature, flow, concentration and pressure, long-term stable operation and precise measurement of multiphase erosion and corrosion coupling damage can be achieved, effectively supporting the safety assessment and risk prevention and control of complex flow-induced damage in petrochemical production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a structural schematic diagram of a multiphase erosion-corrosion coupling damage pipeline simulation experiment test system in the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of the U-shaped special feeding module in the present invention;

[0051] Figure 3 This is a schematic diagram of the structure of the L-shaped special feeding module in the present invention;

[0052] Figure 4 It is a structural schematic diagram of the fluid acceleration module in the present invention;

[0053] Figure 5 A side view of the recess for mounting the embedded specimen in the present invention;

[0054] Figure 6 A cross-sectional view of the recess for mounting the embedded specimen in the present invention;

[0055] Figure 7 It is a structural schematic diagram of the cavitation chamber of the test section in the present invention;

[0056] In the figure: 1. Screw pump; 2. Pressure measurement module; 3. High-pressure rubber expansion joint; 4. Gas release module; 51. Check valve 1; 52. Check valve 2; 53. Check valve 3; 54. Check valve 4; 6. Special feeding module; 61. Electric ball valve; 62. Sand tank; 63. Clamp seal; 64. Solid particle flow meter; 65. U-type connecting pipe; 66. L-type connecting pipe; 7. Temperature control measurement module; 8. Wall shear force measurement chamber; 81. Test chamber shell; 8 2. Spiral lifting valve; 83. Trapezoidal boss; 84. Circular shear force sensor; 9. Fluid acceleration module; 91. Electromagnetic flowmeter; 92. Pressure sensor; 93. Concentration, PH parallel sensor; 94. Conical inner core; 95. Conical inner core support; 96. Embedded specimen installation groove; 10. Manual ball valve; 11. Buffer tank; 12. Pipeline booster module; 13. Temperature sensor; 14. Concentration sensor; 15. Electric control cabinet; 16. Copper tube coil cooler. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] The purpose of the present invention is to provide a multiphase erosion-corrosion coupled damage pipeline simulation experiment test system to solve the problems existing in the prior art.

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0060] The multiphase erosion-corrosion coupling damage pipeline simulation test system in this embodiment is as follows: Figure 1-Figure 7 As shown, it includes a screw pump 1, a pressure measuring module 2, a high-pressure rubber expansion joint 3, a gas release module 4, a check valve, a special feeding module 6, a temperature control and measuring module 7, a wall shear force measuring chamber 8, a fluid acceleration module 9, a buffer tank 11, a pipeline boosting module 12, a temperature sensor 13, a concentration sensor 14, an electric control cabinet 15 and a copper tube coil cooler 16 arranged on the circulation pipeline;

[0061] The outlet of the screw pump 1 is connected to one end of the pipeline, and the inlet of the screw pump 1 is connected to the other end of the pipeline. The screw pump 1 provides power for the fluid in the entire pipeline.

[0062] The high-pressure rubber expansion joint 3 is arranged near the outlet of the screw pump 1, which can absorb system vibration and adapt to fluid pressure changes to ensure the stability of the system;

[0063] The gas discharge module 4 is used to release and regulate the gas to avoid gas blockage in the pipeline causing poor flow;

[0064] The special feeding module 6 is used to feed solid particles into the pipeline;

[0065] The temperature control and measurement module 7 and the copper tube coil cooler 16 are used to ensure the temperature stability of the fluid in the pipeline during the transportation process, prevent the change of fluid properties due to temperature changes, and achieve long-term stable operation of the system;

[0066] The fluid acceleration module 9 can achieve a sharp increase in the fluid flow rate. It is equipped with a pressure transmitter and an electromagnetic flowmeter, which can monitor the pressure and flow in the pipeline in real time to ensure accurate monitoring of the flow and pressure during the experiment;

[0067] The buffer tank 11 is used to store water required for the experiment;

[0068] The pipeline boosting module 12 is used for boosting the pipeline;

[0069] The temperature sensor 13 is used to measure the temperature change of the entire system;

[0070] The concentration sensor 14 is used to measure the pH value and solid volume fraction of the liquid in the pipeline.

[0071] In this specific embodiment, the pipeline is made of titanium alloy or nickel-based alloy or Hastelloy or double molybdenum stainless steel or ultra-low carbon stainless steel. A ceramic structure or a wear-resistant coating can be used in the local fluid mutation zone. The wear-resistant coating material is recommended to be polytetrafluoroethylene (PTFE) or a fluorinated polymer coating; the screw pump 1 is the power source of the entire pipeline, ensuring the stable delivery of the fluid, and increasing the flow rate in the pipe by frequency modulation. The materials of the stator and rotor are the same as those of the pipeline.

[0072] In this specific embodiment, the pressure measurement module 2 includes multiple pressure sensors, each of which is respectively arranged at the inlet and outlet positions of the screw pump 1, for real-time monitoring of the pressure changes of the fluid under different working conditions and monitoring of the operating pressure provided by the screw pump 1; the top and outlet positions of the tank of the gas discharge module 4 are used to timely detect gas release and pipeline pressure fluctuations; the temperature control measurement module 7 is used to monitor the pressure changes of the fluid during heating or cooling, which can ensure the effectiveness of temperature control and timely detect abnormal conditions; the inlet and outlet of the fluid acceleration module 9 are used to monitor the pressure changes of the fluid during the acceleration process, which can evaluate the acceleration effect and optimize the fluid flow state; the pipeline boosting module 12 is used to monitor the pressure changes during the boosting process in real time, ensure that the boosting effect reaches the expected effect, and adjust the system parameters in time to maintain a stable pressure output.

[0073] In this specific embodiment, the high-pressure rubber expansion joint 3 is arranged downstream of the outlet of the screw pump 1, and is used to connect the screw pump 1 with the pipeline. The high-pressure rubber expansion joint 3 is made of high-temperature resistant and corrosion-resistant polytetrafluororubber material, and can withstand temperature changes from -20°C to 150°C. The high-pressure rubber expansion joint 3 includes a multi-layer composite material and a bellows structure. The corrugation height of the bellows is usually 5-10 mm, and the corrugation spacing is 20-30 mm. This design can effectively increase flexibility and pressure resistance. The inner diameter of the expansion joint is 100 mm, the outer diameter is 120 mm, and the length is 500 mm, which can ensure that the system vibration is effectively absorbed within the maximum working pressure (up to 6MPa). The high-pressure rubber expansion joint 3 as a whole reduces the vibration amplitude transmitted to the connecting pipe, reduces the vibration transfer coefficient to below 0.2, improves the stability of the overall system, and reduces the impact of external vibration on the experiment.

[0074] In this specific embodiment, the gas release module 4 is arranged downstream of the high-pressure rubber expansion joint 3. The gas release module 4 includes a gas storage tank, a manual ball valve and a flow meter. The gas storage tank is connected to the pipeline through an air pipe. Pressure sensors are arranged at the upper part and the outlet position of the gas storage tank. The manual ball valve is arranged on the air pipe to control the on and off of the air pipe. The flow meter is arranged on the air pipe. The gas release module 4 is used to store and adjust the gas pressure. It has an adjustable capacity design, can adapt to the gas demand under different experimental conditions, and ensure the safety and visual monitoring of gas storage.

[0075] In this specific embodiment, the check valve is made of corrosion-resistant materials such as nickel-based alloy steel and Hastelloy, and can withstand a pressure of up to 25 MPa. It includes check valve 1 51, check valve 2 52 and check valve 3 53. Check valve 1 51 is arranged near the inlet of the screw pump 1 to ensure that the suction side of the screw pump 1 always maintains a positive pressure and prevents cavitation caused by gas or liquid reflux, thereby extending the service life of the pump; check valve 2 52 is arranged downstream of the connection between the air pipe and the pipeline to ensure that the gas can only be discharged outward and prevent external fluid from flowing back into the pipeline, which can maintain the pressure balance inside the module, reduce the pressure fluctuation caused by reflux, and ensure the working efficiency and safety of the module; check valve 3 53 is arranged at the position of the pipeline boosting module 12 to ensure that the pressurized fluid can only flow to the downstream system in one direction, prevent pressure loss caused by fluid reflux, ensure that the function of the boosting module is fully utilized, and avoid system failures caused by fluid reflux.

[0076] In this specific embodiment, the special feeding module 6 is a U-shaped special feeding module or an L-shaped special feeding module, which is used for storing and discharging solid particles;

[0077] The U-shaped special feeding module includes a sand tank 62 (volume: 30 liters), a solid particle flow meter 64 (flow range: 0-100 kg / h), a U-shaped connecting pipe 65, a clamp seal 63 (sealing level: IP65) and an electric ball valve 61; the discharge ports at the front ends of the two discharge pipes of the U-shaped connecting pipe 65 are connected to the pipeline, the discharge port of the sand tank 62 is connected to the middle of the rear end of the U-shaped connecting pipe 65, the clamp seal 63 is arranged at the top of the sand tank 62 for sealing the tank body, the solid particle flow meter 64 is arranged at the discharge port of the sand tank 62, and the electric ball valve 61 is arranged on the two discharge pipes of the U-shaped connecting pipe 65;

[0078] The L-shaped special feeding module includes a sand tank 62 (volume: 30 liters), a solid particle flow meter 64 (flow range: 0-100 kg / h), an L-shaped connecting pipe 66, a clamp seal 63 (sealing grade: IP65) and an electric ball valve 61; the front end discharge port of the L-shaped connecting pipe 66 is connected to the pipeline, the discharge port of the sand tank 62 is connected to the top of the L-shaped connecting pipe 66, the clamp seal 63 is arranged on the top of the sand tank 62 for sealing the tank body, and the solid particle flow meter 64 and the electric ball valve 61 are arranged on the L-shaped connecting pipe 66;

[0079] When the fluid passes through the special feeding module 6, the increase in flow rate causes the pressure in the pipeline to decrease, forming a local low-pressure area, thereby attracting solid particles into the pipeline; the signal of the solid particle flow meter 64 is transmitted to the electric control cabinet 15 in real time, and the electric control cabinet 15 adjusts the particle release rate by adjusting the opening of the electric ball valve 61. The particle release rate is between 0-50kg / h, ensuring the flexibility and adjustability of feeding, forming a uniform multiphase flow, improving the mixing efficiency of particles and fluids, ensuring the uniformity of the flushing effect, and ensuring the automatic release of materials when the system is running.

[0080] In this specific embodiment, the temperature control and measurement module 7 includes a constant power electric heating belt, a pressure sensor, a temperature sensor and an electromagnetic flowmeter, wherein the constant power electric heating belt is used for pipeline heating and is installed on the outside of the pipeline in a winding manner. The winding length of the constant power electric heating belt is 2m, and the winding spacing is within 20mm to ensure efficient heat transfer and rapid heating of the pipeline fluid; the electromagnetic flowmeter is installed in the straight section of the pipeline to reduce the impact of fluid disturbance on the measurement; the temperature sensor should be installed in the middle position of the constant temperature heating belt and the diagonal elbow position (downstream of the booster module), 100mm away from the elbow, with rapid response capability, so as to feedback the temperature change at the elbow in real time to ensure the stability of the system; the temperature control and measurement module 7 cooperates with the copper tube coil cooler 16 to ensure the temperature stability of the fluid during the transportation process, and has the temperature automatic adjustment and monitoring function of the entire system, which can be automatically adjusted according to the flow rate and ambient temperature of the fluid to prevent the fluid from changing in properties due to temperature changes, and ensure the temperature of the entire system is constant.

[0081] In this specific embodiment, the wall shear force measurement chamber 8 includes a test chamber shell 81, a spiral lifting valve 82, a trapezoidal boss 83 and a circular shear force sensor 84. The test chamber shell 81 is installed on the outside of the pipeline. The test chamber shell 81 is made of nickel-based alloy or Hastelloy and can be 400 mm in length. Five circular shear force sensors 84 contacting the outer wall of the pipeline are arranged on the top of the test chamber shell 81. Each circular shear force sensor 84 is spaced 50 mm apart to ensure that the entire flow area can be covered and the shear force changes at different positions can be captured. The bottom of the test chamber shell 81 is designed with a trapezoidal boss 83 that can be lifted and lowered, which can effectively change the flow rate of the fluid in the measuring chamber, thereby adapting to various experimental environments and conditions. The spiral lifting valve 82 is threadedly connected to the trapezoidal boss 83 to control the lifting and lowering of the trapezoidal boss 83.

[0082] In this specific embodiment, the fluid acceleration module 9 includes a test section shrink ring, an electromagnetic flowmeter 91, a pressure sensor 92, and a concentration and pH parallel sensor 93; the test section shrink ring includes a solid double-conical inner core 94 and an embedded sample installation groove 96 that are relatively arranged. The solid double-conical inner core 94 is supported by 8 identical conical inner core support bars 95 with a length, width and height of 30mm×3mm×2mm, suspended in the center of the pipeline, and forms an annular gap between the inner wall of the pipeline for fluid flow, which can significantly increase the flow rate under specific flow and pressure conditions, and the flow rate of the main pipeline can reach 30m / s, thereby enhancing the flushing effect and ensuring effective damage assessment of the material during the flushing process. The embedded sample installation groove 96 is located inside the right side of the flange in the middle of the test section shrink ring and is an annular groove opened on the inner wall of the pipeline with a width of 30mm and a depth of 3mm. It is used to install 12 square samples with a length of 30mm and a thickness of 3mm and an arc that fits tightly with the groove. The 12 sample pieces can form a tight circle and fit tightly with the groove. The test section shrink ring is a fluid dynamics component. Four concentration and pH parallel sensors 93 at different heights are arranged before and after the test section shrink ring, and are located at different heights (25mm, 50mm, 75mm, and 100mm). The measurement frequency of each sensor is 1Hz, and the response time is less than 0.5 seconds. It can respond quickly to fluid changes and is connected to the PID controller of the electrical control cabinet 15 to ensure accurate monitoring of the pressure, concentration and pH of the test section. Two electromagnetic flow meters 91 (0.3-12m / s, accuracy ±0.5%) and two pressure sensors 92 (0-10MPa, accuracy ±0.1%) are installed 500mm before and after the test section shrink ring to measure the flow and pressure of the fluid before and after the test section shrink ring. It can maintain measurement accuracy under high flow rate conditions to ensure accurate monitoring of the flow of the entire system.

[0083] In this specific embodiment, a U-shaped buffer boost pipeline is connected to the pipeline downstream of the fluid acceleration module 9, and both ends of the buffer boost pipeline are respectively connected to the pipeline, and a manual ball valve 10 is installed on the section of the pipeline connected to the buffer boost pipeline. The buffer tank 11 is installed upstream of the buffer boost pipeline, and a check valve 454 and a manual ball valve 10 are provided on the pipeline at the inlet end of the buffer tank 11. A liquid level monitoring device is installed on the buffer tank 11, which can monitor the water level changes in real time. The setting of the buffer tank 11 facilitates the replenishment and discharge of water in the pipeline, thereby ensuring a stable water supply for the entire system.

[0084] In this specific embodiment, the pipeline boosting module 12 includes a boosting pump, which is arranged downstream of the buffer boosting pipeline. A manual ball valve 10 is arranged on the buffer boosting pipeline at the inlet end of the boosting pump, and a check valve 53 is arranged on the buffer boosting pipeline at the outlet end of the boosting pump; the boosting pump uses a three-phase asynchronous motor, model YE2-100L-6, power 1.5kw, frequency 50Hz, check valve, pressure sensor, which can provide stable pressure under different working conditions, change the flow rate by frequency adjustment, and the flow rate adjustment range is 0.5 to 5m 3 / h, which can provide the system with a pressure of up to 20MPa and monitor the system pressure through a pressure sensor to meet the pressure requirements of the experiment.

[0085] In this embodiment, the manual ball valve 10 is configured for easy operation and maintenance. It is made of corrosion-resistant materials such as nickel-based alloy steel and Hastelloy, can withstand a pressure of up to 25 MPa, can work stably under high temperature and high pressure conditions, and ensure the reliability of fluid control.

[0086] In this embodiment, the temperature sensor 13 is installed at the temperature control and measurement module 7 and also installed on the pipeline downstream of the boost module. The temperature sensor 13 is used to measure the temperature change of the entire system, and cooperates with the temperature control and measurement module 7 and the copper tube coil cooler 16 to ensure accurate monitoring and control of the temperature of the entire system.

[0087] In this specific embodiment, a PID controller is arranged in the electric control cabinet 15. By collecting and processing the temperature, flow, concentration and pressure signals of each module, the rotation speed of the screw pump 1 and the switch of the temperature control measurement module 7, the pipeline booster module 12, the special feeding module 6 and the copper tube coil cooler 16 can be automatically adjusted according to the real-time pressure, temperature, flow and concentration data to form a closed-loop control system, maintain the stability of the system pressure, temperature, concentration and flow, and ensure that the system operates stably within the set range. The electric control cabinet 15 is also provided with a touch screen or a display to display the working status and parameters of each module in real time, allowing the operator to manually adjust the settings, or select the automatic mode for the system to optimize and control itself.

[0088] In this specific embodiment, the copper tube coil cooler 16 is installed at the upstream part of the screw pump 1, 1300mm away from the screw pump, using a copper tube with a diameter of 12mm, adopting a double-layer spiral winding method, the spacing between each circle is controlled within 5mm, and the winding length is 2m, ensuring that the contact area between the cooler and the pipeline is maximized and the heat exchange efficiency is improved. The temperature sensor 13 of the temperature control measurement module 7 is linked to set the target temperature during operation. When the fluid temperature exceeds the set value, the PID controller of the electric control cabinet 15 adjusts the coolant flow through the copper tube coil cooler 16 according to the real-time temperature feedback to ensure that the fluid temperature is stable within the set range.

[0089] Based on the above multiphase erosion-corrosion coupled damaged pipeline simulation experiment test system, this embodiment also provides a multiphase erosion-corrosion coupled damaged pipeline simulation experiment test method, including the following steps:

[0090] Step 1: Check the sealing of valves and devices in the entire circulation pipeline;

[0091] Step 2: Install the wall shear force measurement chamber 8 and the test section shrink ring on the main pipe;

[0092] Step 3: Fill the buffer tank 11 with water and ensure that the water filling volume is maintained at about 2 / 3 by observing the liquid level gauge;

[0093] Step 4: Open the manual ball valve 10 to allow the water in the buffer tank 11 to flow into the pipeline, and close the ball valve after the water fills the entire pipeline;

[0094] Step 5: Open the ball valve switch of the booster pump, start the booster pump to pressurize the pipeline in the human-machine operation interface 15 of the electric control cabinet, keep the boost flow rate at 0.5kg / h, observe the value of the pressure gauge, and when the pressure reaches 2MPa, stop the boost and close the ball valve of the booster pump;

[0095] Step 6: Start the screw pump 1 on the human-machine operation interface of the electric control cabinet 15, adjust the frequency gradually from 5 Hz to make the water in the pipeline flow, start the electric ball valve 61 of the special feeding module 6, and make the particles enter the pipeline at a discharge rate of 1.5 kg / h. When the particle concentration reaches the required level, close the electric ball valve 61;

[0096] Step 7: Depending on whether the experiment is heating or cooling, turn on the constant power electric heating cable or the copper tube coil cooler 16 to keep the pipe temperature at about 30°;

[0097] Step 8: Adjust the flow rate of the pipeline equipment by changing the frequency of the screw pump 1 to achieve the flow rate required for the experiment;

[0098] Step 9: After completing the test, drain the water and flush the pipes.

[0099] The multiphase erosion-corrosion coupled damage pipeline simulation test system and method in this embodiment can be used for testing the gas-liquid-solid three-phase service environment in the quenching chamber of the coal indirect liquefaction coal gasification furnace, where the gas phase is acid gas (H2, CO, H2S, CO2, HCl, COS, etc.) and the liquid phase is acid water (H + , Cl - , HS - 、CO3 2- 、COOH - , CN - The solid phase is coal slag and coal powder (solid content is 5-30%), the pressure is about 6.0MPa, the discharge rate of the slag breaker discharge pipe at the bottom of the quenching chamber is 10-60m / s every 1-3 hours, and the material is 15CrMoR+316L (lining).

[0100] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A multiphase erosion-corrosion coupled damage pipeline simulation experiment test system, characterized by: It includes a screw pump, a pressure measuring module, a high-pressure rubber expansion joint, a gas release module, a check valve, a special feeding module, a temperature control measuring module, a wall shear force measuring chamber, a fluid acceleration module, a buffer tank, a pipeline boosting module, a temperature sensor, a concentration sensor, an electric control cabinet and a copper tube coil cooler arranged on the circulation pipeline; The outlet of the screw pump is connected to one end of the pipeline, the inlet of the screw pump is connected to the other end of the pipeline, and the screw pump provides power for the fluid in the entire pipeline; The high-pressure rubber expansion joint is arranged near the outlet of the screw pump, and can absorb system vibration and adapt to fluid pressure changes to ensure the stability of the system; The gas discharge module is used to release and regulate the gas to avoid blockage of the gas in the pipeline resulting in poor flow; The special feeding module is used to feed solid particles into the pipeline; The temperature control and measurement module and the copper tube coil cooler are used to ensure the temperature stability of the fluid in the pipeline during transportation, prevent the change of fluid properties due to temperature changes, and achieve long-term stable operation of the system; The fluid acceleration module can achieve a sharp increase in the fluid flow rate. It is equipped with a pressure transmitter and an electromagnetic flowmeter, which can monitor the pressure and flow in the pipeline in real time to ensure accurate monitoring of the flow and pressure during the experiment. The buffer tank is used to store water required for the experiment; The pipeline boosting module is used for boosting the pressure of the pipeline; The temperature sensor is used to measure the temperature change of the entire system; The concentration sensor is used to measure the pH value and solid volume fraction of the liquid in the pipeline.

2. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The pipeline is made of titanium alloy or nickel-based alloy or Hastelloy or double molybdenum stainless steel or ultra-low carbon stainless steel, and the material of the stator and rotor of the screw pump is the same as that of the pipeline.

3. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The pressure measurement module includes multiple pressure sensors, each of which is respectively arranged at the inlet and outlet of the screw pump, for real-time monitoring of the pressure changes of the fluid under different working conditions and monitoring of the operating pressure provided by the screw pump; the tank top and outlet of the gas discharge module are used to timely detect gas release and pipeline pressure fluctuations; the temperature control measurement module is used to monitor the pressure changes of the fluid during heating or cooling, which can ensure the effectiveness of temperature control and timely detect abnormal situations; the inlet and outlet of the fluid acceleration module are used to monitor the pressure changes of the fluid during the acceleration process, which can evaluate the acceleration effect and optimize the fluid flow state; the pipeline boosting module is used to monitor the pressure changes during the boosting process in real time to ensure that the boosting effect reaches the expected, and adjust the system parameters in time to maintain a stable pressure output.

4. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The high-pressure rubber expansion joint is arranged downstream of the outlet of the screw pump and is used to connect the screw pump and the pipeline. The high-pressure rubber expansion joint is made of high-temperature resistant and corrosion-resistant polytetrafluororubber material.

5. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The gas release module is arranged downstream of the high-pressure rubber expansion joint, and the gas release module includes an air storage tank, a manual ball valve and a flow meter. The air storage tank is connected to the pipeline through an air pipe, and pressure sensors are arranged at the upper part and outlet position of the air storage tank. The manual ball valve is arranged on the air pipe to control the opening and closing of the air pipe, and the flow meter is arranged on the air pipe.

6. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 5 is characterized by: The check valve is made of corrosion-resistant material and can withstand a pressure of up to 25MPa. It includes check valve 1, check valve 2 and check valve 3. Check valve 1 is arranged near the inlet of the screw pump to ensure that the suction side of the screw pump always maintains a positive pressure and prevents cavitation caused by gas or liquid reflux, thereby extending the service life of the pump; check valve 2 is arranged downstream of the connection between the air pipe and the pipeline to ensure that the gas can only be discharged outward and prevent external fluid from flowing back into the pipeline, which can maintain the pressure balance inside the module, reduce the pressure fluctuation caused by reflux, and ensure the working efficiency and safety of the module; check valve 3 is arranged at the position of the pipeline boosting module to ensure that the pressurized fluid can only flow to the downstream system in one direction, prevent pressure loss caused by fluid reflux, ensure that the function of the boosting module is fully utilized, and avoid system failures caused by fluid reflux.

7. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The special feeding module is a U-shaped special feeding module or an L-shaped special feeding module, which is used for storing and discharging solid particles; The U-shaped special feeding module includes a sand tank, a solid particle flow meter, a U-shaped connecting pipe, a clamp seal and an electric ball valve; the discharge ports at the front ends of the two discharge pipes of the U-shaped connecting pipe are connected to the pipeline, the discharge port of the sand tank is connected to the middle of the rear end of the U-shaped connecting pipe, the clamp seal is arranged at the top of the sand tank for sealing the tank body, the solid particle flow meter is arranged at the discharge port of the sand tank, and the electric ball valve is arranged on the two discharge pipes of the U-shaped connecting pipe; The L-shaped special feeding module includes a sand tank, a solid particle flow meter, an L-shaped connecting pipe, a clamp seal and an electric ball valve; the front end discharge port of the L-shaped connecting pipe is connected to the pipeline, the discharge port of the sand tank is connected to the top of the L-shaped connecting pipe, the clamp seal is arranged on the top of the sand tank for sealing the tank body, and the solid particle flow meter and the electric ball valve are arranged on the L-shaped connecting pipe; When the fluid passes through the special feeding module, the increase in flow rate causes the pressure in the pipeline to decrease, forming a local low-pressure area, thereby attracting solid particles into the pipeline; the signal of the solid particle flow meter is transmitted to the electric control cabinet in real time, and the electric control cabinet adjusts the opening of the electric ball valve to adjust the particle release rate.

8. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The temperature control and measurement module includes a constant power electric heating tape, a pressure sensor, a temperature sensor and an electromagnetic flowmeter, wherein the constant power electric heating tape is used for pipeline heating and is installed on the outside of the pipeline in a winding manner. The winding length of the constant power electric heating tape is 2m, and the winding spacing is within 20mm to ensure efficient heat transfer and ensure rapid heating of the pipeline fluid.

9. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The wall shear force measurement chamber includes a test chamber shell, a spiral lifting valve, a trapezoidal boss and a circular shear force sensor. The test chamber shell is installed on the outside of the pipeline. The test chamber shell is made of nickel-based alloy or Hastelloy and has a length of 400 mm. Five circular shear force sensors in contact with the outer wall of the pipeline are arranged on the top of the test chamber shell. Each of the circular shear force sensors is spaced 50 mm apart to ensure that the entire flow area can be covered and the shear force changes at different positions can be captured. The bottom of the test chamber shell is designed with a trapezoidal boss that can be lifted and lowered, which can effectively change the flow rate of the fluid in the measuring chamber, thereby adapting to various experimental environments and conditions. The spiral lifting valve is threadedly connected to the trapezoidal boss to control the lifting and lowering of the trapezoidal boss.

10. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The fluid acceleration module includes a test section shrink ring, an electromagnetic flowmeter, a pressure sensor, and concentration and pH parallel sensors; the test section shrink ring includes a solid double-conical inner core and an embedded sample installation groove that are relatively set. The solid double-conical inner core is shaped like a cylinder in the middle with cones at both ends. It is supported by 8 identical cone inner core support bars with a length, width and height of 30mm×3mm×2mm. It is suspended in the center of the pipeline and forms an annular gap with the inner wall of the pipeline for fluid flow. The embedded sample installation groove is located inside the right side of the flange in the middle of the test section shrink ring. The groove is 360°, with a width of 30mm and a depth of 3mm. It is used to install 12 square sample pieces with a length of 30mm and a thickness of 3mm with arcs used for testing. The 12 sample pieces can be surrounded by a tight circle and fit tightly with the groove. Four concentration and pH parallel sensors at different heights can be set before and after the test section shrink ring, and they are located at different heights and connected to the PID controller of the electric control cabinet to ensure accurate monitoring of the pressure, concentration and pH of the test section; two electromagnetic flow meters and two pressure sensors are also installed before and after the test section shrink ring to measure the flow rate and pressure of the fluid flowing through the test section shrink ring, which can maintain measurement accuracy under high flow rate conditions and ensure accurate monitoring of the flow of the entire system.

11. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 6 is characterized by: A U-shaped buffer boost pipeline is connected to the pipeline downstream of the fluid acceleration module, and both ends of the buffer boost pipeline are respectively connected to the pipeline, and a manual ball valve is installed on the section of the pipeline connected to the buffer boost pipeline. The buffer tank is installed upstream of the buffer boost pipeline, and a check valve 4 and a manual ball valve are arranged on the pipeline at the inlet end of the buffer tank. A liquid level monitoring device is installed on the buffer tank, which can monitor the water level changes in real time.

12. The multiphase erosion-corrosion coupled damage pipeline simulation experiment test system according to claim 11 is characterized in that: The pipeline boosting module includes a boosting pump, which is arranged downstream of the buffer boosting pipeline. A manual ball valve is arranged on the buffer boosting pipeline at the inlet end of the boosting pump, and the check valve three is arranged on the buffer boosting pipeline at the outlet end of the boosting pump.

13. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 5 or 12, characterized in that: The manual ball valve is made of corrosion-resistant material.

14. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: The temperature sensor is installed at the temperature control and measurement module and also installed on the pipeline downstream of the boost module. The temperature sensor is used to measure the temperature change of the entire system, and cooperates with the temperature control and measurement module and the copper tube coil cooler to ensure accurate monitoring and control of the temperature of the entire system.

15. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 1 is characterized by: A PID controller is arranged in the electric control cabinet, which collects and processes the temperature, flow, concentration and pressure signals of each module, and can automatically adjust the rotation speed of the screw pump and the switch of the temperature control measurement module, the pipeline booster module, the special feeding module and the copper tube coil cooler according to the real-time pressure, temperature, flow and concentration data, so as to form a closed-loop control system, maintain the stability of the system pressure, temperature, concentration and flow, and ensure that the system runs stably within the set range. The electric control cabinet is also provided with a touch screen or a display, which displays the working status and parameters of each module in real time, and allows the operator to manually adjust the settings, or select the automatic mode for the system to optimize and control itself.

16. The multiphase erosion-corrosion coupling damage pipeline simulation experiment test system according to claim 15 is characterized in that: The copper tube coil cooler is installed on the upstream part of the screw pump and is linked to the temperature sensor of the temperature control measurement module. When working, the target temperature is set. When the fluid temperature exceeds the set value, the PID controller of the electric control cabinet adjusts the coolant flow through the copper tube coil cooler according to the real-time temperature feedback to ensure that the fluid temperature is stable within the set range.

17. A multiphase erosion-corrosion coupling damaged pipeline simulation experiment test method, using the multiphase erosion-corrosion coupling damaged pipeline simulation experiment test system according to any one of claims 1 to 16, characterized in that: The following steps are involved: Step 1: Check the sealing of valves and devices in the entire circulation pipeline; Step 2: Install the wall shear force measurement chamber and the test section shrink ring on the main pipe; Step 3: Fill the buffer tank with water and ensure that the water filling volume remains at about 2 / 3 by observing the liquid level gauge; Step 4: Open the manual ball valve to allow the water in the buffer tank to flow into the pipeline, and close the ball valve after the water fills the entire pipeline; Step 5: Open the ball valve switch of the booster pump, start the booster pump to pressurize the pipeline in the human-machine operation interface of the electric control cabinet, keep the boost flow rate at 0.5kg / h, observe the value of the pressure gauge, and when the pressure reaches 2MPa, stop the boost and close the ball valve of the booster pump; Step 6: Start the screw pump on the human-machine interface of the electric control cabinet, adjust the frequency from 5Hz and gradually increase it to make the water in the pipeline flow, start the electric ball valve of the special feeding module, and let the particles enter the pipeline at a discharge rate of 1.5kg / h. When the particle concentration reaches the requirement, close the electric ball valve; Step 7: Depending on whether the experiment is heating or cooling, turn on the constant power electric heating cable or copper tube coil cooler to keep the pipe temperature at around 30°; Step 8: Adjust the flow rate of the pipeline equipment by changing the frequency of the screw pump to achieve the flow rate required for the experiment; Step 9: After completing the test, drain the water and flush the pipes.

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