A multiphase erosion-corrosion coupled damage pipeline simulation test system and method

Abstract

The present invention discloses a multiphase erosion and corrosion coupled damage pipeline simulation experimental testing system and method, 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 boosting module, a temperature sensor, an electric control cabinet and a copper tube coil cooler arranged on the circulation pipeline; the present invention solves the problem that the gas-liquid / gas-liquid-solid multiphase erosion and corrosion coupled damage law and the damage rate prediction are difficult to test 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 temperature, flow, concentration and pressure precise control systems, long-term stable operation and precise measurement of multiphase erosion and corrosion coupled damage are achieved, effectively supporting the safety assessment and risk prevention and control of complex flow-induced damage in petrochemical production equipment.

Description

Technical Field

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

[0002] Petrochemical production facilities often experience harsh environments with high sulfur, chlorine, and acid levels, leading to multiphase flow erosion corrosion damage and failure of equipment, pipelines, and safety accessories. Examples include oil refining atmospheric and vacuum decompression units, catalytic cracking units, Claus / Consov desulfurization units in the chemical industry, and coal-to-liquids / gasification units and direct liquefaction / coal-to-liquids units in the coal-to-chemical industry. Predicting the patterns and rates of multiphase flow erosion corrosion damage to guide safe operation and maintenance in petrochemical production facilities is an urgent industry need.

[0003] Currently, there are many industrial pipeline multiphase erosion simulation test devices both at home and abroad, but most of them are designed for oil and gas production and transportation environments. Typical examples abroad include the multiphase flow pipeline device at 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), with a flow rate of 0.1-20 m / s, a temperature of 25-120°C, and a pressure of 1000 psi; the multiphase flow corrosion and erosion pipeline device at the University of Tulsa in the United States is suitable for natural gas / oil and gas production pipeline systems (water-sand / oil-sand / liquid-solid two-phase), with a flow rate of 0.1-30 m / s, a temperature of 0-80°C, and a pressure of 1000 psi. Typical domestic examples include the flow corrosion / erosion simulation experimental device at the University of Science and Technology Beijing, which is suitable for oil and gas transmission pipeline systems (oil-water / gas-liquid-solid three-phase), with a flow rate of 0.1-30 m / s, a temperature of 0-100°C, and a pressure of 2 MPa. 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 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 experimental testing 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, focusing on solving the real simulation of the actual flow corrosion / erosion environment and conditions of chemical industry pipelines; stabilizing flow state changes and accurately controlling operating parameters (temperature, pressure, concentration, flow rate, etc.); special feeding, pressurization, acceleration, constant temperature, anti-corrosion, anti-wear, anti-vibration and other structural designs, thereby ensuring long-term stable operation of the device and realizing accurate 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 coupled 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 boosting 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, and 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, which 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 gas to avoid gas blockage in the pipeline causing 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 changes in 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 fluid flow rate. It is equipped with a pressure transmitter and an electromagnetic flowmeter to monitor the pressure and flow in the pipeline in real time, ensuring accurate monitoring of 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 pipeline pressure;

[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, nickel-based alloy, Hastelloy, 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 positions 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 top of the tank and the outlet position 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 the heating or cooling process, 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, ensure that the boosting effect meets expectations, and 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. The high-pressure rubber expansion joint is made of high-temperature-resistant and corrosion-resistant tetrafluororubber material.

[0021] Preferably, the gas discharge module is arranged downstream of the high-pressure rubber expansion joint, and the gas discharge 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 provided at the upper part and outlet position of the air storage tank. The manual ball valve is provided on the air pipe to control the on and off of the air pipe, and the flow meter is provided 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 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 positive pressure and prevents cavitation caused by gas or liquid backflow, 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 pressure fluctuations caused by backflow, 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 backflow, ensure that the function of the boosting module is fully utilized, and avoid system failure caused by fluid backflow.

[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 part 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 feeding 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 feeding tank is connected to the top end of the L-shaped connecting pipe, the clamp seal is provided on the top of the sand feeding tank for sealing the tank body, and the solid particle flow meter and the electric ball valve are provided 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 particle release rate by adjusting the opening of the electric ball valve.

[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 that the pipeline fluid is quickly heated up.

[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 alloy 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 with cones at both ends and a cone in the middle. It is supported by 8 conical inner core support bars and is suspended in the center of the pipeline. An annular gap is formed between 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 set before and after the test section shrinkage ring, and are located at different heights. At the same time, they are 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 test section shrinkage ring to measure the flow and pressure of the fluid flowing through the test section shrinkage ring. It 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 4 and a manual ball valve are provided 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.

[0031] Preferably, the pipeline boosting module includes a boosting pump, which is arranged downstream of the buffer boosting pipeline. A manual ball valve is provided on the buffer boosting pipeline at the inlet end of the boosting pump, and the check valve three is provided 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 measurement module and also installed on the pipeline downstream of the boost module. The temperature sensor is used to measure the temperature changes 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.

[0034] Preferably, a PID controller is provided in the electrical control cabinet, which collects and processes the temperature, flow, concentration and pressure signals of each module, and can automatically adjust the 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 operates stably within the set range. The electrical control cabinet is also provided with a touch screen or 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 at the upstream part of the screw pump and is linked to the temperature sensor of the temperature control and 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 real-time temperature feedback to ensure that the fluid temperature is stable within the set range.

[0036] Based on the above-mentioned 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 shrinkage ring on the main pipe;

[0039] Step 3: Fill the buffer tank with water and ensure that the water level 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 pipe. After the water fills the entire pipe, close the ball valve;

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

[0042] Step 6: Start the screw pump on the human-machine interface of the electric control cabinet, and adjust the frequency from 5 Hz to gradually increase it to make the water in the pipeline flow. Start the electric ball valve of the special feeding module to allow the particles to 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.

[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 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 difficult problem of testing the damage law of gas-liquid / gas-liquid-solid multiphase erosion and corrosion coupling and predicting the damage rate in the harsh high-sulfur, high-chlorine and high-acid environment of 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 following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0049] Figure 1 Schematic diagram of the structure of the multiphase erosion-corrosion coupled damage pipeline simulation test system of the present invention;

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

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

[0052] Figure 4 Schematic diagram of the structure of the fluid acceleration module in the present invention;

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

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

[0055] Figure 7 Schematic diagram of the structure of the test section cavitation chamber 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-shaped connecting pipe; 66. L-shaped 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 and pH parallel sensor; 94. Conical inner core; 95. Conical inner core support; 96. Embedded specimen mounting 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 clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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 experimental testing 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 coupled 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 measurement 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 measurement module 7, a wall shear force measurement 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 located near the outlet of the screw pump 1 and can absorb system vibrations and adapt to changes in fluid pressure, ensuring system stability.

[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 that the temperature of the fluid in the pipeline is stable during transportation, 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, ensuring 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 pressure;

[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, nickel-based alloy, Hastelloy, double molybdenum stainless steel, or ultra-low carbon stainless steel. A ceramic structure or wear-resistant coating can be used in the local fluid mutation zone. The wear-resistant coating material is recommended to be polytetrafluoroethylene (PTFE) or fluorinated polymer coating; the screw pump 1 is the power source of the entire pipeline, ensuring stable fluid transportation and increasing the flow rate in the pipe through 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 body 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 the heating or cooling process, 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 meets expectations, 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 to the pipeline. The high-pressure rubber expansion joint 3 is made of high-temperature resistant and corrosion-resistant tetrafluororubber 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 generally 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 6 MPa). The high-pressure rubber expansion joint 3 as a whole reduces the vibration amplitude transmitted to the connecting pipe and reduces the vibration transfer coefficient to below 0.2, thereby improving the stability of the overall system and reducing 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 provided at the upper part and outlet position of the gas storage tank. The manual ball valve is provided on the air pipe to control the on and off of the air pipe. The flow meter is provided 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 requirements under different experimental conditions, and ensure the safety of gas storage and visual monitoring.

[0075] In this specific embodiment, the check valve is made of corrosion-resistant materials such as nickel-based alloy steel and Hastelloy alloy, 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 positive pressure and prevents cavitation caused by gas or liquid backflow, 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. It can maintain the pressure balance inside the module, reduce pressure fluctuations caused by backflow, 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 backflow, ensure that the function of the boosting module is fully utilized, and avoid system failure caused by fluid backflow.

[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 flowmeter 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 provided at the top of the sand tank 62 for sealing the tank body, the solid particle flowmeter 64 is provided at the discharge port of the sand tank 62, and the electric ball valve 61 is provided 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 flowmeter 64 (flow range: 0-100 kg / h), an L-shaped connecting pipe 66, a clamp seal 63 (sealing level: 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 provided at the top of the sand tank 62 for sealing the tank body, and the solid particle flowmeter 64 and the electric ball valve 61 are provided on the L-shaped connecting pipe 66.

[0079] As the fluid passes through the special feeding module 6, the increased flow rate causes the pressure in the pipeline to decrease, forming a localized low-pressure area, which attracts solid particles into the pipeline. The signal from the solid particle flowmeter 64 is transmitted in real time to the electrical control cabinet 15, which adjusts the opening of the electric ball valve 61 to regulate the particle release rate. The particle release rate is between 0 and 50 kg / h, ensuring flexible and adjustable feeding, forming a uniform multiphase flow, improving the mixing efficiency of particles and fluid, ensuring a uniform flushing effect, and guaranteeing automatic material release during system operation.

[0080] In this specific embodiment, the temperature control and measurement module 7 includes a constant power electric heating tape, a pressure sensor, a temperature sensor and an electromagnetic flowmeter. 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 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 tape and the diagonal elbow position (downstream of the booster module), 100mm away from the elbow, with a fast response capability to provide real-time feedback on temperature changes at the elbow to ensure system stability; the temperature control and measurement module 7 cooperates with the copper tube coil cooler 16 to ensure the temperature stability of the fluid during transportation, and has the temperature automatic adjustment and monitoring function of the entire system, which can automatically adjust according to the flow rate and ambient temperature of the fluid to prevent the fluid from changing in properties due to temperature changes, thereby ensuring 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 alloy and can be 400 mm in length. Five circular shear force sensors 84 that contact the outer wall of the pipeline are set on the top of the test chamber shell 81. Each circular shear force sensor 84 is 50 mm apart to ensure that it can cover the entire flow area and capture the shear force changes at different positions. 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 biconical inner core 94 and an embedded sample mounting groove 96 arranged opposite each other. The solid biconical inner core 94 is supported by eight identical conical inner core support bars 95 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. It can significantly increase the flow rate under specific flow and pressure conditions, reaching a flow rate of 30m / s compared to the main pipeline, 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 a curvature 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 of different heights are set before and after the test section shrink ring, and are located at different heights (25mm, 50mm, 75mm, 100mm). The measurement frequency of each sensor is 1Hz, and the response time is less than 0.5 seconds. It can quickly respond to fluid changes and is connected to the PID controller of the electrical control cabinet 15 to ensure accurate monitoring of the test section pressure, concentration and pH; 2 electromagnetic flowmeters 91 (0.3-12m / s, accuracy ±0.5%) and 2 pressure sensors 92 (0-10MPa, accuracy ±0.1%) are also 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 this 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 54 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, 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 provided on the buffer boosting pipeline at the inlet end of the boosting pump, and a check valve 53 is provided 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 designed for easy operation and maintenance. It is made of corrosion-resistant materials such as nickel-based alloy steel and Hastelloy alloy. It can withstand a pressure of up to 25 MPa and can work stably under high temperature and high pressure conditions to 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 changes 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 provided in the electrical 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 switches 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, forming a closed-loop control system to maintain the stability of the system pressure, temperature, concentration and flow, and ensure that the system operates stably within the set range. The electrical control cabinet 15 is also provided with a touch screen or 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, a copper coil cooler 16 is installed upstream of the screw pump 1, 1300 mm from the pump. It utilizes a 12 mm diameter copper tube, wound in a double-layer spiral, with the spacing between each turn controlled to within 5 mm. The winding length is 2 m, maximizing the contact area between the cooler and the pipe, improving heat exchange efficiency. It is linked to the temperature sensor 13 of the temperature control and measurement module 7. During operation, a target temperature is set. When the fluid temperature exceeds the set value, the PID controller in the electrical control cabinet 15 adjusts the coolant flow through the copper coil cooler 16 based on real-time temperature feedback, ensuring that the fluid temperature remains within the set range.

[0089] Based on the above-mentioned 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 shrinkage ring on the main pipe;

[0092] Step 3: Fill the buffer tank 11 with water and ensure that the water level remains 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 boost the pipeline in the human-machine operation interface 15 of the electric control cabinet, maintain the boost flow rate at 0.5kg / h, observe the pressure gauge value, and when the pressure reaches 2MPa, stop the boost and close the booster pump ball valve;

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

[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 maintain the pipe temperature at around 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 to test 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 intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A multiphase erosion-corrosion coupled damage pipeline simulation test system, characterized by: It includes 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 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 the circulation pipeline; The outlet of the screw pump is connected to one end of the pipeline, and 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, which can absorb system vibration and adapt to fluid pressure changes to ensure the stability of the system; The gas discharge module is used for releasing and regulating gas; the gas discharge module is arranged downstream of the high-pressure rubber expansion joint, and the gas discharge module 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, and a pressure sensor is provided at the upper part and outlet position of the gas storage tank. The manual ball valve is provided on the air pipe to control the on-off of the air pipe, and the flow meter is provided on the air pipe; The check valve is made of corrosion-resistant material and includes check valve 1, check valve 2 and check valve 3. The check valve 1 is arranged near the inlet of the screw pump; the check valve 2 is arranged downstream of the connection between the air pipe and the pipeline; the check valve 3 is arranged at the position of the pipeline booster module; The special feeding module is used to feed solid particles into the pipeline; 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 part 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 feeding 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 feeding tank is connected to the top end of the L-shaped connecting pipe, the clamp seal is provided on the top of the sand feeding tank for sealing the tank body, and the solid particle flow meter and the electric ball valve are provided on the L-shaped connecting pipe; 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 particle discharge rate by adjusting the opening of the electric ball valve; The temperature control and measurement module and the copper tube coil cooler are used to ensure that the temperature of the fluid in the pipeline is stable during transportation; The wall shear force measurement chamber includes a test chamber housing, a spiral lifting valve, a trapezoidal boss, and a circular shear force sensor. The test chamber housing is installed on the outside of the pipeline. The test chamber housing is made of nickel-based alloy or Hastelloy and has a length of 400 mm. Five circular shear force sensors that contact the outer wall of the pipeline are set on the top of the test chamber housing. Each circular shear force sensor is separated by 50 mm. The bottom of the test chamber housing is designed with a trapezoidal boss that can be raised and lowered. The spiral lifting valve is threadedly connected to the trapezoidal boss to control the raising and lowering of the trapezoidal boss. The fluid acceleration module can achieve a sharp increase in the fluid flow rate, and a pressure transmitter and an electromagnetic flowmeter are provided inside the module, which can monitor the pressure and flow in the pipeline in real time, ensuring accurate monitoring of the flow and pressure during the experiment; the fluid acceleration module includes a test section shrinkage ring, an electromagnetic flowmeter, a pressure sensor and a concentration and pH parallel sensor; the test section shrinkage ring includes a relatively set solid double-conical inner core and an embedded sample installation groove, the solid double-conical inner core is shaped like a cylinder with cones at both ends, and is supported by 8 identical conical inner core support bars with a length, width and height of 30mm×3mm×2mm, suspended in the center of the pipeline, and forms an annular gap with the inner wall of the pipeline for fluid flow; the embedded The 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°, 30mm wide and 3mm deep. It is used to install 12 square sample pieces with a length of 30mm and a thickness of 3mm with arcs used for the test. The 12 sample pieces can be formed into a tight circle and fit tightly with the groove. Four concentration and pH parallel sensors of different heights are set before and after the test section shrink ring. They are located at different heights and are 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 of the electromagnetic flowmeters 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 before and after the test section shrink ring. 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 provided on the pipeline at the inlet end of the buffer tank. A liquid level monitoring device is installed on the buffer tank to monitor water level changes in real time; The buffer tank is used to store water required for the experiment; The pipeline boosting module is used for boosting the pipeline; the pipeline boosting module includes a boosting pump, which is arranged downstream of the buffer boosting pipeline, a manual ball valve is provided on the buffer boosting pipeline at the inlet end of the boosting pump, and the check valve three is provided on the buffer boosting pipeline at the outlet end of the boosting pump; 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 coupled damage pipeline simulation test system according to claim 1 is characterized by: The pipeline is made of titanium alloy, nickel-based alloy, Hastelloy, double molybdenum stainless steel, or ultra-low carbon stainless steel. The material of the stator and rotor of the screw pump is the same as that of the pipeline.

3. The multiphase erosion-corrosion coupled damage pipeline simulation 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 positions 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 top of the tank and the outlet position 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; the inlet and outlet of the fluid acceleration module are used to monitor the pressure changes of the fluid during the acceleration process; and the pipeline boosting module is used to monitor the pressure changes during the boosting process in real time.

4. The multiphase erosion-corrosion coupled damage pipeline simulation 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 tetrafluororubber material.

5. The multiphase erosion-corrosion coupled damage pipeline simulation test system according to claim 1 is characterized by: The temperature control and measurement module includes a constant power electric heating cable, a pressure sensor, a temperature sensor and an electromagnetic flowmeter, wherein the constant power electric heating cable 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 cable is 2m, and the winding spacing is within 20mm.

6. The multiphase erosion-corrosion coupled damage pipeline simulation test system according to claim 1 is characterized by: The manual ball valve is made of corrosion-resistant material.

7. The multiphase erosion-corrosion coupled damage pipeline simulation 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.

8. The multiphase erosion-corrosion coupled damage pipeline simulation test system according to claim 1 is characterized by: A PID controller is provided in the electrical control cabinet. By collecting and processing the temperature, flow, concentration and pressure signals of each module, the rotation speed of the screw pump and the switches of the temperature control measurement module, pipeline booster module, special feeding module and copper tube coil cooler can be automatically adjusted according to the real-time pressure, temperature, flow and concentration data to form a closed-loop control system. The electrical control cabinet is also provided with a touch screen or 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.

9. The multiphase erosion-corrosion coupled damage pipeline simulation test system according to claim 8 is characterized by: 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 and 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 real-time temperature feedback to ensure that the fluid temperature is stable within the set range.

10. A multiphase erosion-corrosion coupled damaged pipeline simulation test method, using the multiphase erosion-corrosion coupled damaged pipeline simulation test system according to any one of claims 1 to 9, 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 shrinkage ring on the main pipe; Step 3: Fill the buffer tank with water and ensure that the water level 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 pipe. After the water fills the entire pipe, close the ball valve; Step 5: Open the ball valve switch of the booster pump, start the booster pump to boost the pipeline on the human-machine interface of the electric control cabinet, maintain the boost flow rate at 0.5kg / h, observe the pressure gauge value, and when the pressure reaches 2MPa, stop the boost and close the booster pump ball valve; Step 6: Start the screw pump on the human-machine interface of the electric control cabinet, and adjust the frequency from 5 Hz to gradually increase it to make the water in the pipe flow. Start the electric ball valve of the special feeding module to allow the particles to enter the pipe at a discharge rate of 1.5 kg / h. Close the electric ball valve when the particle concentration reaches the required level. 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 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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