High-gas-content gas-liquid two-phase flow mixing device and method
By designing a high-gas-containing gas-liquid two-phase flow mixing device of the spray tube and data acquisition system, the problem of gas-liquid two-phase flow mixing failure in the steam generator is solved, and the stable entrainment and uniform mixing of gas-liquid is achieved, which improves the accuracy of vibration displacement measurement and ensures the stable operation of the nuclear power plant.
Patent Information
- Application Number
- CN202510407928.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2025-07-04
AI Technical Summary
The existing steam generators fail to mix gas-liquid two-phase flow at high gas content, resulting in inaccurate measurement of liquid accumulation and vibration characteristics, and the inability to achieve stable entrainment and uniform mixing, which affects the normal function of the heat transfer pipe and the stable operation of the nuclear power plant.
A high-gas-containing gas-liquid two-phase flow mixing device is designed, including a spray tube and a data acquisition system. The gas-liquid mixing is achieved through the micro-hole array of the spray tube, and data is synchronized by a high-speed photographer and acceleration sensor to perform frequency band correction to obtain accurate vibration displacement data.
The stable entrainment and uniform mixing of gas-liquid two-phase flow at high gas content is achieved, which improves the consistency between the flow-induced vibration mechanism and the theoretical model, provides high-precision vibration displacement measurement, and ensures the normal function of the heat transfer tube and the stable operation of the nuclear power plant.
Smart Images
Figure CN120242792A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of steam generators, and in particular to a gas-liquid two-phase flow mixing device and method with a high gas holdup rate. Background Art
[0002] The demand for energy by humans is increasing continuously. Many countries have taken important strategic measures - developing new energy and strengthening the utilization of renewable energy. Among different types of energy, nuclear energy is an essential and important part. During the entire process of nuclear power generation, the steam generator plays a crucial role. Through a large number of thin-walled U-shaped heat transfer tubes inside it, the heat of the primary coolant is effectively transferred to the secondary cooling water. As a key connection hub between the primary and secondary loops of a nuclear power plant, the steam generator has a very important position during the operation of the entire nuclear power plant. For this reason, ensuring the normal function of the heat transfer tubes becomes the basic premise for ensuring the stable operation of the nuclear power plant.
[0003] In a steam generator, inverted U-shaped heat transfer tubes are usually used inside. The heat transfer tubes are prone to vibration under the scouring of the fluid, and these vibrations may lead to the wear and even rupture of the tube bundle. In the shell side of the steam generator in a nuclear power plant, the U-shaped heat transfer tube bundle has long been subjected to the lateral scouring of gas-liquid two-phase fluid. The flow-induced vibration under the condition of a high gas holdup rate (gas volume fraction ≥ 80%) is an important reason for the fatigue failure of the tube bundle. Historical data shows that from 1979 to 1994, a total of 55 steam generators were forced to shut down due to heat transfer tube damage, which led to the actual life of a large number of steam generators being lower than the design expected life, thus causing huge economic losses. Therefore, it is very important to study the problem of tube bundle vibration induced by fluid.
[0004] The existing steam generator heat transfer tubes have the following defects: gas-liquid mixing failure: Under a high gas holdup rate, due to the gas-liquid slip ratio, the liquid accumulates downstream of the rising path, forming a local high-pressure area, and the liquid cannot be effectively entrained by the gas, resulting in a too large deviation in the actual gas holdup rate; test distortion: The uneven mixing leads to a deviation between the excitation intensity of flow-induced vibration and the theoretical model, and the vibration characteristics of mist flow cannot be accurately reflected; device limitation: The existing test bench lacks an active droplet dispersion mechanism and cannot achieve stable mixing with a gas holdup rate > 80%. There is an urgent need for a test device and method that can achieve stable gas-liquid mixing at a high gas holdup rate and improve the measurement accuracy of vibration displacement. Summary of the Invention
[0005] The purpose of the present invention is to provide a gas-liquid two-phase flow mixing device and method with a high gas holdup rate, solve the problem of gas-liquid two-phase flow mixing failure at a high gas holdup rate (80 - 99%), eliminate the accumulation phenomenon of the liquid downstream of the rising path, achieve stable entrainment of liquid droplets by the gas, improve the mixing uniformity, increase the coincidence degree between the flow-induced vibration mechanism and the theoretical model, and construct a high-precision test system suitable for multi-modal measurement of vibration displacement.
[0006] To achieve the above object, the present invention provides a high gas holdup gas-liquid two-phase flow mixing device, which includes a fluid circulation system, a main experimental platform, and a data acquisition system. The fluid circulation system includes a compressed air pipeline and a water fluid circulation loop. The compressed air pipeline is connected to the inlet of the main experimental platform. The compressed air pipeline includes an air compressor, a gas storage tank, a rotameter, and a ball valve. The gas storage tank is connected to the inlet of the main experimental platform through a gas channel. The gas enters the main experimental platform through the gas channel in sequence through the air compressor, the gas storage tank, the ball valve, and the rotameter. The water fluid circulation loop includes a water tank, a centrifugal pump, a water pipeline, an electromagnetic flowmeter, and an electromagnetic valve. One end of the water pipeline connected to the main experimental platform is provided with a spray pipe. The liquid is transported by the centrifugal pump, and after the flow rate is adjusted by the electromagnetic flowmeter and the electromagnetic valve, it enters the spray pipe through the water pipeline. The spray pipe is arranged at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform. The pipe wall of the spray pipe is evenly distributed with a microporous array. The inside of the main experimental platform includes a tube bundle and a tube sheet.
[0007] Preferably, a transparent glass window is arranged on the side of the tube sheet at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform for real-time observation of the vibration of the tube bundle and the two-phase flow pattern.
[0008] Preferably, the spray pipe adopts a hollow cylinder structure, with an axial length of 505 mm, an outer diameter of 26 mm, an inner diameter of 24 mm, and a 5 mm solid sealing section reserved at the top. A microporous array area starts to be set at a distance of 240 mm from the bottom end.
[0009] Preferably, each row of the microporous array is provided with 3 through holes, the diameter of the through holes is 0.5 - 2 mm, the center distance between adjacent through holes is 4 mm, and all the through holes are opened on one side of the pipe wall of the spray pipe.
[0010] Preferably, the main experimental platform is connected to the data acquisition system. The data acquisition system includes a high-speed camera with a frame rate ≥ 2000 fps, an acceleration sensor, and a dynamic data acquisition instrument, which are used to synchronously collect the vibration images of the tube bundle and the acceleration signals. The dynamic data acquisition instrument is used to perform band correction on the acceleration signals, and the band locking range is the vibration main frequency ± 50%.
[0011] The present invention also provides a usage method of the high gas holdup gas-liquid two-phase flow mixing device, which includes the following steps:
[0012] S1. The gas enters the main experimental platform through the gas channel in sequence through the air compressor, the gas storage tank, the ball valve, and the rotameter. The gas flow rate is adjusted to a gas holdup of 80 - 99%. The gas enters from the lower part of the main experimental platform. The liquid is transported by the centrifugal pump, and after the flow rate is adjusted by the electromagnetic flowmeter and the electromagnetic valve, it enters the spray pipe through the water pipeline. The liquid is atomized by the spray pipe and mixed with the gas to form a uniform two-phase flow;
[0013] S2. Synchronously collect the vibration images and acceleration signals of the tube bundle on the main experimental platform through a high-speed camera and an acceleration sensor;
[0014] S3. Extract the time-domain displacement trajectory of the tube bundle based on the image recognition algorithm, and perform a main frequency ±50% frequency band correction in combination with the integration result of the acceleration signal to obtain the vibration displacement data;
[0015] S4. Observe and verify the mixing uniformity and vibration form in real time through the transparent glass window.
[0016] Preferably, in step S1, the flow control range of liquid atomization spraying is 0 - 20 m 3 / h.
[0017] Preferably, in step S3, the frequency band correction is specifically: perform amplitude matching correction within the range of main frequency ±50% in the frequency domain for the displacement time history curve obtained by integrating the acceleration signal and the displacement trajectory extracted by image recognition.
[0018] The advantages and beneficial effects of the present invention adopting the above-mentioned high gas holdup gas-liquid two-phase flow mixing device and method are as follows:
[0019] 1. The present invention effectively solves the problem of gas-liquid mixing failure. Through the atomization spraying design of the spraying pipe, it overcomes the problem of liquid accumulation caused by the gas-liquid slip ratio in the traditional bottom mixing method, realizes the stable entrainment of gas to liquid droplets, and ensures the accurate reproduction of the two-phase flow state under the condition of high gas holdup (≥80%).
[0020] 2. The present invention improves the authenticity of the flow-induced vibration test, establishes a uniform mixing flow pattern of gas carrying water mist, eliminates the gas holdup deviation caused by liquid stagnation, significantly improves the consistency between the flow-induced vibration excitation characteristics and the theoretical model, and provides a reliable experimental basis for the analysis of the vibration behavior of the tube bundle.
[0021] 3. The present invention optimizes the functionality of the test device. The innovative design of the spraying pipeline and the collaborative structure of the gas main pipeline break through the limitation of the existing test bench lacking an active droplet dispersion mechanism, realize the uniform distribution of droplets in the air flow, and directly observe the interaction between the tube bundle vibration and the two-phase flow state.
[0022] 4. The present invention improves the research system of the flow-induced vibration mechanism. By accurately capturing the vibration characteristics of the tube bundle in the mist flow pattern, it reveals the essential differences between the vibration induced by gas-liquid two-phase flow and single-phase flow, and provides a theoretical basis for the anti-vibration design of heat transfer tubes in engineering practice.
[0023] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings
[0024] Figure 1 is the flow schematic diagram of the gas-liquid two-phase flow mixing device of the present invention;
[0025] Figure 2 It is a schematic structural diagram of the gas-liquid two-phase flow mixing device of the present invention;
[0026] Figure 3 It is a schematic diagram of the water pipeline in the gas-liquid two-phase flow mixing device of the present invention;
[0027] Figure 4 It is a schematic diagram of the spray pipe in the gas-liquid two-phase flow mixing device of the present invention.
[0028] Reference numerals
[0029] 1, high-speed camera; 2, main experimental platform; 3, perspective glass window; 4, water pipeline; 5, gas channel; 6, gas storage tank; 7, air compressor; 8, water tank; 9, centrifugal pump; 10, tube bundle; 11, rotameter; 12, electromagnetic flowmeter; 13, electromagnetic valve; 14, dynamic data acquisition instrument; 15, spray pipe; 16, microhole array. Specific embodiments
[0030] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.
[0031] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the ordinary meanings understood by those of ordinary skill in the field to which the present invention belongs. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before the term cover the elements or items listed after the term and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0032] Example 1
[0033] A gas-liquid two-phase flow mixing device with a high gas holdup rate, comprising a fluid circulation system, a main experimental platform 2, and a data acquisition system. The fluid circulation system includes a compressed air pipeline and a water fluid circulation loop. The compressed air pipeline is connected to the inlet of the main experimental platform 2. The compressed air pipeline includes an air compressor 7, a gas storage tank 6, a rotameter 11, and a ball valve (not shown in the figure). The gas storage tank 6 is connected to the inlet of the main experimental platform 2 through a gas channel 5. The gas sequentially passes through the air compressor 7, the gas storage tank 6, the ball valve, and the rotameter 11 and enters the main experimental platform 2 through the gas channel 5. The water fluid circulation loop includes a water tank 8, a centrifugal pump 9, a water pipeline 4, an electromagnetic flowmeter 12, and an electromagnetic valve 13. One end of the water pipeline 4 connected to the main experimental platform 2 is provided with a spray pipe 15, and the spray pipe 15 extends into the main experimental platform 2. The liquid is transported by the centrifugal pump 9, and after the flow rate is adjusted by the electromagnetic flowmeter 12 and the electromagnetic valve 13, it enters the spray pipe 15 through the water pipeline 4. The spray pipe 15 is arranged at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform 2. The wall of the spray pipe 15 is evenly distributed with a microporous array 16. The interior of the main experimental platform 2 includes a tube bundle 10 and a tube sheet.
[0034] A transparent glass window 3 is arranged on the side of the tube sheet at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform 2 for real-time observation of the vibration of the tube bundle 10 and the two-phase flow pattern.
[0035] The spray pipe 15 adopts a hollow cylinder structure, with an axial length of 505 mm, an outer diameter of 26 mm, an inner diameter of 24 mm, and a 5 mm solid sealing section reserved at the top. The microporous array 16 area starts to be arranged at a distance of 240 mm from the bottom end.
[0036] Each row of the microporous array 16 is provided with 3 through holes, the hole diameter of the through holes is 0.5 - 2 mm, the center distance between adjacent through holes is 4 mm, and all the through holes are opened on one side of the wall of the spray pipe 15.
[0037] The main experimental platform 2 is connected to the data acquisition system. The data acquisition system includes a high-speed camera 1 with a frame rate ≥ 2000 fps, an acceleration sensor (not shown in the figure), and a dynamic data acquisition instrument 14, which are used to synchronously collect the vibration images and acceleration signals of the tube bundle 10. The dynamic data acquisition instrument 14 is used to perform band correction on the acceleration signals, and the band locking range is the vibration main frequency ± 50%.
[0038] A method for using a gas-liquid two-phase flow mixing device with a high gas holdup rate includes the following steps:
[0039] S1. The gas passes through the air compressor 7, gas storage tank 6, ball valve and rotameter 11 in sequence and enters the main experimental platform 2 through the gas channel 5. Adjust the gas flow rate to 80 - 99% gas holdup. The gas enters from the lower part of the main experimental platform 2. The liquid is transported by the centrifugal pump 9, and after adjusting the flow rate through the electromagnetic flowmeter 12 and electromagnetic valve 13, it enters the spray pipe 15 through the water pipeline 4. The liquid is atomized by the spray pipe 15 and mixed with the gas to form a uniform two-phase flow. The flow control range of the liquid atomization spray is 0 - 20m 3 / h.
[0040] S2. Synchronously collect the vibration images and acceleration signals of the tube bundle 10 of the main experimental platform 2 through the high-speed camera 1 and acceleration sensor.
[0041] S3. Extract the time-domain displacement trajectory of the tube bundle 10 based on the image recognition algorithm, and perform the main frequency ±50% frequency band correction in combination with the integration result of the acceleration signal to obtain the vibration displacement data. The frequency band correction is specifically: perform the amplitude matching correction within the range of the main frequency ±50% in the frequency domain for the displacement time history curve obtained by integrating the acceleration signal and the displacement trajectory extracted by image recognition.
[0042] S4. Observe and verify the mixing uniformity and vibration form in real time through the transparent glass window 3.
[0043] As Figure 1 shown, the two-phase flow mixing device experimental system includes the following modules:
[0044] 1. Circulation system
[0045] Water fluid circulation loop: water storage tank 8 → centrifugal pump 9 → electromagnetic flowmeter 12 → electromagnetic valve 13 → spray pipe 15.
[0046] Compressed air pipeline: air compressor 7 → gas storage tank 6 → ball valve → rotameter 11 → lower inlet of the main experimental platform 2.
[0047] 2. Experimental platform
[0048] Mixing section: the intersection of the main gas path and the auxiliary liquid path, realizing the mixing of gas-liquid two-phase flow.
[0049] Observation section: set a transparent glass window 3 for visual monitoring of the vibration of the tube bundle 10 and the flow pattern.
[0050] 3. Acquisition system
[0051] High-speed camera (frame rate ≥ 2000fps) records the vibration images of the tube bundle 10.
[0052] Dynamic data acquisition instrument 14 (DH5922 type) acquires the acceleration signal.
[0053] Experimental procedure
[0054] 1. Initialization
[0055] Water injection and air exhaust: Open all exhaust valves and inject water into the water storage tank 8 until the set water level is reached;
[0056] Seal inspection: Confirm that the pipeline connections are leak-free and the torque of the fasteners meets the standard (≥20 N·m).
[0057] 2. Testing
[0058] Start the centrifugal pump 9 and adjust the solenoid valve 13 to make the water flow rate stable at 20 m 3 / h;
[0059] Check the instrument status: The fluctuations of the electromagnetic flowmeter 12 and the pressure gauge reading are < ±2%.
[0060] 3. Mixing control
[0061] Start the air compressor and adjust the gas flow rate through the ball valve;
[0062] Liquid atomization: Water is sprayed out through 15 micropores (pore diameter 0.5 - 2 mm) of the annular spray pipe.
[0063] 4. Acquisition and processing
[0064] Synchronously trigger the high-speed camera and the data acquisition instrument to record the vibration displacement signal of the tube bundle 10;
[0065] Extract the displacement time history curve based on the image recognition algorithm and perform frequency band correction (main frequency ±50%) in combination with the acceleration signal.
[0066] IV. Experiment termination and maintenance
[0067] 1. Turn off the power supply of the centrifugal pump 9, the air compressor and the electric control cabinet.
[0068] 2. Drain the liquid in the pipeline and reset the valves to the initial state.
[0069] The fluid circulation system mainly consists of two major parts: the water fluid circulation loop and the compressed air pipeline. These two systems converge at the entrance of the main experimental platform 2 and jointly form the mixing of gas-water two-phase fluid. The water fluid circulation loop consists of several key components: the water storage tank 8 stores the water source, the centrifugal pump 9 is responsible for pushing the water flow, the solenoid valve is used to precisely control the start-stop and flow rate of the water flow, and the electromagnetic flowmeter 12 monitors the real-time water flow rate to ensure the accuracy and stability of the flow rate. The compressed air pipeline includes the air compressor 7, the air storage tank 6, the ball valve and the rotameter 11. The air compressor 7 compresses the air, the air storage tank 6 is used to stabilize the pressure of the compressed air, the ball valve adjusts the air flow rate entering the main experimental platform 2, and the rotameter 11 is used to measure the air flow rate to ensure the continuity and stability of the air supply.
[0070] During the experiment, open the liquid flow valve of the main loop, close the liquid flow valve of the secondary loop, open the bypass valve, start the centrifugal pump 9 and adjust it to the corresponding flow rate; open the ball valve of the compressed air pipeline, start the air compressor 7 and adjust it to the corresponding flow rate; in front of the main experimental platform 2, the gas and the sprayed liquid meet and mix, and then enter the main experimental platform 2 evenly, so as to achieve uniform gas-liquid mixing.
[0071] After the improvement, the water fluid circulation changes from one loop to two loops. One is the original main loop, and the other is a new secondary loop opened in front of the main loop flow valve. The secondary loop is connected with a solenoid valve and an electromagnetic flowmeter 12 to ensure the accuracy and stability of the flow rate. The other end of the secondary loop is connected to a sprinkler head and leads to the upstream of the main experimental platform 2.
[0072] When conducting experiments with a high gas holdup, close the liquid flow valve of the main loop, open the liquid flow valve of the secondary loop, open the bypass valve, start the centrifugal pump 9 and adjust it to the corresponding flow rate; open the ball valve of the compressed air pipeline, start the air compressor and adjust it to the corresponding flow rate; upstream of the main experimental section, the gas and the sprayed liquid meet and mix, and then enter the main experimental platform 2 evenly, so as to achieve uniform mixing with a high gas holdup.
[0073] The main experimental platform 2 includes a main body part, and its prominent feature is that a rectangular glass window with a size of 260mm×250mm is installed at the front end, so that the fluid dynamics and tube bundle vibration during the experiment can be clearly observed, which is convenient for experimental operators to monitor the vibration behavior of the tube bundle and the flow state of the two-phase fluid. In addition, all components of the device are tightly connected by flanges to ensure the sealing and stability of the overall structure. The water pipeline 4 is installed on the main experimental platform in a cantilever beam manner, which increases the flexibility of the device and the safety of the tube bundle.
[0074] The water pipeline 4 is an elastic tube, which consists of a thick round tube and a thin round tube. The equal-frequency elastic tube uses the thin round tube structure. The purpose is to keep the natural frequencies of the elastic tube in the two directions of along-flow and cross-flow as consistent as possible, so as to conduct systematic variable control and result analysis. The material of the elastic tube is 6063 aluminum alloy. The main reason is that aluminum alloy can ensure that the heat transfer tube has a relatively low natural frequency under the premise of maintaining the same size. The lower natural frequency helps to occur the fluidelastic instability phenomenon within the experimental flow rate range. In addition, aluminum alloy also has good corrosion resistance, which enables it to maintain a long service life and high reliability in a variety of experimental environments.
[0075] Therefore, the present invention adopts the above-mentioned high gas holdup gas-liquid two-phase flow mixing device and method to solve the problem of the mixing failure of high gas holdup (80-99%) gas-liquid two-phase flow, eliminate the accumulation phenomenon of liquid downstream of the rising path, realize the stable entrainment of gas to droplets, improve the mixing uniformity, increase the coincidence degree between the flow-induced vibration mechanism and the theoretical model, and construct a high-precision test system suitable for multi-modal measurement of vibration displacement.
[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.
Claims
1. A gas-liquid two-phase flow mixing device with a high gas holdup, characterized in that: It includes a fluid circulation system, a main experimental platform, and a data acquisition system. The fluid circulation system includes a compressed air pipeline and a water fluid circulation loop. The compressed air pipeline is connected to the inlet of the main experimental platform. The compressed air pipeline includes an air compressor, a gas storage tank, a rotameter, and a ball valve. The gas storage tank is connected to the inlet of the main experimental platform through a gas passage. The gas enters the main experimental platform through the air compressor, the gas storage tank, the ball valve, and the rotameter in sequence through the gas passage. The water fluid circulation loop includes a water tank, a centrifugal pump, a water pipeline, an electromagnetic flowmeter, and an electromagnetic valve. One end of the water pipeline connected to the main experimental platform is provided with a spray pipe. The liquid is transported by the centrifugal pump, and after the flow rate is adjusted by the electromagnetic flowmeter and the electromagnetic valve, it enters the spray pipe through the water pipeline. The spray pipe is arranged at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform. The pipe wall of the spray pipe is evenly distributed with a microporous array. The inside of the main experimental platform includes a tube bundle and a tube sheet.
2. The high gas holdup gas-liquid two-phase flow mixing device according to claim 1, characterized in that: A transparent glass window is arranged on the side of the tube sheet at a position 5 times the pipe diameter upstream of the inlet of the main experimental platform for real-time observation of the vibration of the tube bundle and the two-phase flow pattern.
3. The gas-liquid two-phase flow mixing device with a high gas holdup according to claim 1, characterized in that: The spray pipe adopts a hollow cylinder structure, with an axial length of 505 mm, an outer diameter of 26 mm, an inner diameter of 24 mm, and a 5 mm solid sealing section reserved at the top. The microporous array area starts to be arranged at a distance of 240 mm from the bottom end.
4. A high gas holdup gas-liquid two-phase flow mixing device according to claim 1, characterized in that: Each row of the microporous array is provided with 3 through holes, the hole diameter of the through holes is 0.5 - 2 mm, the center distance between adjacent through holes is 4 mm, and all through holes are opened on one side of the pipe wall of the spray pipe.
5. The high gas holdup gas-liquid two-phase flow mixing device according to claim 1, wherein: The main experimental platform is connected to the data acquisition system. The data acquisition system includes a high-speed camera with a frame rate ≥ 2000 fps, an acceleration sensor, and a dynamic data acquisition instrument, which are used to synchronously collect the vibration images of the tube bundle and the acceleration signals. The dynamic data acquisition instrument is used to perform band correction on the acceleration signals, and the band locking range is the vibration main frequency ± 50%.
6. The usage method of a high gas holdup gas-liquid two-phase flow mixing device according to any one of claims 1-5, characterized in that, It includes the following steps: S1. The gas enters the main experimental platform through the air compressor, the gas storage tank, the ball valve, and the rotameter in sequence through the gas passage. The gas flow rate is adjusted to an air content of 80 - 99%. The gas enters from the lower part of the main experimental platform. The liquid is transported by the centrifugal pump, and after the flow rate is adjusted by the electromagnetic flowmeter and the electromagnetic valve, it enters the spray pipe through the water pipeline. The liquid is atomized by the spray pipe and mixed with the gas to form a uniform two-phase flow. S2. The high-speed camera and the acceleration sensor are used to synchronously collect the vibration images of the tube bundle and the acceleration signals of the main experimental platform. S3. Based on the image recognition algorithm, the time-domain displacement trajectory of the tube bundle is extracted, and combined with the integration result of the acceleration signal, band correction within the range of the main frequency ± 50% is performed to obtain the vibration displacement data. S4. Through the transparent glass window, the mixing uniformity and vibration form are observed and verified in real time.
7. The usage method of a gas-liquid two-phase flow mixing device with a high gas holdup according to claim 6, characterized in that: In step S1, the flow control range of liquid atomization spraying is 0 - 20 m 3 / h.
8. The method of using a high gas holdup gas-liquid two-phase flow mixing device according to claim 6, characterized in that In step S3, the band correction is specifically: the displacement time history curve obtained by integrating the acceleration signal is amplitude-matched and corrected with the displacement trajectory extracted by image recognition within the range of the main frequency ± 50% in the frequency domain.