Multi-span heat exchange tube wear test bench capable of adjusting span and gap in high-temperature water environment

Abstract

The invention relates to a multi-span heat exchange tube wear test bed capable of adjusting span and gap in a high-temperature water environment, and belongs to the technical field of flow-induced vibration and wear of heat exchange tubes. The device comprises an experimental platform, a temperature control water tank, a water circulation loop and a data acquisition and control system, wherein a guide rail sliding block mechanism driven by a waterproof motor is arranged in the experimental platform, and the supporting span of a heat exchange tube can be continuously adjusted; the mechanism is provided with an adjustable gap device which is used for accurately controlling the gap between the anti-vibration strip and the heat exchange tube. The temperature control water tank is heated through a heating type flange, an internal temperature control blind pipe monitors water temperature, and the water circulation loop regulates and controls high-temperature water flow through a pump, a valve and a flow meter. The data acquisition and control system monitors parameters such as vibration and temperature in real time. The device can simulate the influence of span and gap on flow-induced vibration and fretting wear of the heat exchange tube in a high-temperature water environment, and is suitable for reliability test and life prediction of heat exchange equipment in the fields of nuclear power, chemical engineering and the like.

Description

Technical Field

[0001] This invention belongs to the field of heat exchanger tube flow-induced vibration and wear technology, specifically relating to a multi-span heat exchanger tube wear test bench with adjustable span and clearance in a high-temperature water environment. Background Technology

[0002] Nuclear energy, as a clean, low-carbon, and highly efficient energy source, has attracted worldwide attention. The active, safe, and orderly development of nuclear power is an important means of optimizing the energy structure, ensuring energy supply security, and addressing climate change. It not only guarantees the security and stability of energy supply but also promotes the optimization and upgrading of the energy structure.

[0003] In nuclear power systems, steam generators are critical energy conversion devices in nuclear power plants, thermal power plants, and chemical plants, undertaking the core function of transferring primary heat energy to the secondary working fluid (water / steam). Among them, heat transfer tubes, as the "lifeline" of heat exchange, directly determine the safety and operational efficiency of the equipment. The heat exchange tube bundles are subjected to long-term high-temperature, high-pressure fluid impacts, inducing flow-induced vibration and fretting wear, which are the core failure mechanisms leading to tube wall thinning, cracking, and even leakage. Flow-induced vibration is the most significant cause of heat transfer tube wear in steam generators. Currently, fluid elastic instability is recognized as the most threatening flow-induced vibration mechanism to the integrity of heat transfer tubes. To reduce and suppress the occurrence of fluid elastic instability, anti-vibration strips are used to fix the steam generator tube bundles. Existing test devices suffer from problems such as difficulty in achieving test conditions and insufficient adjustment capabilities for span and gap. Considering the above factors, it is necessary to develop a wear test device with adjustable span and gap in a high-temperature water environment. This device will analyze the influence of different gaps and spans on the wear behavior of heat exchange tubes under high-temperature water conditions, thereby extending the service life of heat exchange tubes in steam generators. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-span heat exchange tube wear test bench with adjustable span and gap in a high-temperature water environment. It can simulate the flow-induced vibration and fretting wear behavior of heat exchange tube bundles in a high-temperature water environment and monitor vibration parameters and wear conditions in real time. It is suitable for reliability testing and life prediction of heat exchange equipment in nuclear power, chemical industry and other fields.

[0005] The technical solution of the present invention is as follows: A multi-span heat exchanger tube wear test bench with adjustable span and gap in a high-temperature water environment is characterized by comprising an experimental platform, a temperature-controlled water tank, a water circulation loop, and a data acquisition and control system. The experimental platform contains heat exchanger tubes and a guide rail slider mechanism driven by a waterproof motor. The guide rail slider mechanism is equipped with an adjustable gap device, which can adjust the support gap between the anti-vibration strips and the heat exchanger tubes. The bottom of the temperature-controlled water tank is equipped with a heating flange, which contains a temperature-controlled blind tube for temperature detection (not shown separately in the figure, usually placed inside the flange). The experimental platform and the temperature-controlled water tank are connected via a water circulation loop. The data acquisition and control system is used to monitor, adjust, and record the vibration, wear, and system operating parameters of the heat exchanger tubes in real time.

[0006] Furthermore, the adjustable gap device includes a base plate on which a slider is tunably mounted. An acceleration sensor and an anti-vibration strip are fixedly mounted on the slider. The gap between the anti-vibration strip and the heat exchange tube can be adjusted by adjusting the mounting position of the slider.

[0007] Furthermore, the water circulation loop includes a centrifugal pump, which is connected to a temperature-controlled water tank via a pipeline. The pipeline is equipped with a flow meter and an electric valve for regulating and detecting the water flow, a manual valve for manually controlling the water flow, and a pressure regulator for stabilizing the internal pressure of the pipeline.

[0008] Furthermore, the control system includes a computer, sensors, and a temperature sensor. The computer is connected to the sensors and temperature sensor via a data acquisition card for real-time data acquisition and processing.

[0009] Furthermore, the test platform's inlet adopts a Venturi tapered section structure to optimize water flow distribution and reduce turbulence.

[0010] Furthermore, the waterproof motor-driven guide rail slider mechanism includes two parallel slide rails and multiple movable sliders that can move along the slide rails; each movable slider is provided with a support plate base for supporting the heat exchange tubes, and the span of the multi-span heat exchange tubes can be continuously adjusted by adjusting the position of the movable slider on the slide rail.

[0011] Furthermore, the guide rail slider mechanism also includes a waterproof motor, the output end of which is connected to a lead screw. The lead screw is connected to the movable slider through a lead screw and nut assembly, and the movable slider is moved by the lead screw and nut assembly driven by the waterproof motor.

[0012] Furthermore, the lead screw nut assembly is connected to the lead screw, the lead screw is connected to the slide rail base plate through the lead screw support seat, and the waterproof motor is connected to the slide rail base plate through the lead screw fixing seat.

[0013] Furthermore, the heat exchange tube is connected to a fixed plate on the experimental platform via a fixed support.

[0014] Furthermore, a high-temperature piezoelectric sensor is installed on the heat exchange tube.

[0015] The beneficial effects of this invention are as follows: 1) In this invention, based on the set guide rail slider mechanism, the heat exchange tube support plate can be linearly moved on the slide rail, thereby continuously adjusting the support span of multi-span heat exchange tubes; at the same time, the adjustable gap device drives the sensor support block to move through the slider, which can control the gap between the anti-vibration strip and the heat exchange tube, and can simulate the vibration and wear behavior under different support conditions. 2) In this invention, the bottom of the temperature-controlled water tank is heated by a heating flange, and the temperature is monitored in real time by a temperature-controlled blind pipe, which can provide a high-temperature water environment and accurately simulate the actual operating conditions; the water circulation loop is driven by a centrifugal pump to circulate high-temperature water, and the flow meter and electric valve precisely regulate and monitor the water flow, while the pressure stabilizer stabilizes the internal pressure of the pipeline to ensure the stability and repeatability of the test conditions; 3) In this invention, based on the setting of the data acquisition and control system, multi-dimensional data such as vibration, contact force, and temperature can be collected simultaneously to realize the automation of waterproof motor drive, electric valve adjustment, data acquisition and processing; 4) In this invention, the Venturi tapered section structure design of the water inlet of the experimental platform optimizes the water flow distribution, reduces turbulence, and improves the accuracy of the test results. Attached Figure Description

[0016] Figure 1 This is a block diagram of the data acquisition and control system of the present invention; Figure 2 This is a schematic diagram of the overall structure of the test bench of the present invention; Figure 3 This is a schematic diagram of an adjustable span device; Figure 4 This is a schematic diagram of an adjustable gap device; Figure 5 This is a structural diagram of a temperature-controlled water tank. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0018] Conversely, this invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of the invention as defined in the claims. Furthermore, to provide a better understanding of the invention, certain specific details are described in detail below. However, those skilled in the art will fully understand the invention even without these detailed descriptions.

[0019] like Figures 1 to 5 As shown, the multi-span heat exchanger tube vibration and wear test bench with adjustable span and gap in high-temperature water environment provided by the present invention includes a computer 1, a data acquisition card 2, a sensor 3, a temperature sensor 4, a pressure-stabilizing water tank 5, a flow meter 6, a centrifugal pump 7, an electric regulating valve 8, a temperature-controlled water tank 9, a manual regulating valve 10, a pipeline system 11, and an experimental platform 12; wherein: the computer 1, the acquisition card 2, the sensor 3, and the temperature sensor 4 constitute a data acquisition and control system; the centrifugal pump 7, the pipeline system 11, the flow meter 6, the electric valve 8, and the manual valve 10 constitute a water circulation loop.

[0020] Specifically, the temperature-controlled water tank 9 is equipped with an inlet 301, an outlet 302, and a flange heater 303 to provide and maintain a high-temperature water environment; Specifically, the experimental platform 12 includes an inlet flange 14, an outlet flange 13, a waterproof motor-driven guide rail slider mechanism 16, a heat exchange tube 18, a heat exchange tube support base 22, and a heat exchange tube support plate 20. Specifically, the waterproof motor-driven guide rail slider mechanism 16 includes a waterproof motor 1605, a lead screw 1608, a lead screw nut assembly 1607, a slide rail 1611, a slide rail base plate 1610, a movable slider 1601, a lead screw fixing seat 1604, and a lead screw support seat 1609. The waterproof motor 1605 drives the lead screw nut assembly 1607, causing the movable slider 1601 to move along the slide rail, thereby adjusting the position of the heat exchange tube support plate 20 and achieving continuous adjustment of the span.

[0021] Specifically, the adjustable gap device 21 includes an anti-vibration strip 2106, an acceleration sensor 2105, a sensor support block 2104, a fixing bolt 2107, a slider 2109, and a base plate 2108. By adjusting the position of the slider 2109, the gap between the anti-vibration strip 2106 and the heat exchange tube 18 can be precisely controlled to simulate vibration and wear behavior under different support conditions. Figure 1 A flowchart illustrating the invention is provided. (For example...) Figure 1As shown, high-temperature water is pumped from the temperature-controlled water tank 9 by centrifugal pump 7, flows into the experimental platform 12 through the pipeline system 11, flows through the heat exchange tube 18, and returns to the temperature-controlled water tank 9, forming a cycle. Flow meter 6 and electric regulating valve 8 are used to adjust and monitor water flow in real time, temperature sensor 4 and temperature-controlled blind tube are used to monitor water temperature, and sensor 3 and acceleration sensor 2105 are used to collect vibration and contact force data, which are then transmitted to computer 1 for processing and analysis via data acquisition card 2.

[0022] Figure 2 The overall structure of the test bench is shown. The experimental platform 12, serving as the core testing area, houses a waterproof motor-driven guide rail slider mechanism 16, heat exchange tubes 18, and their support structure. A temperature-controlled water tank 9 is connected to the experimental platform 12 via a piping system 11, forming a high-temperature water circulation loop with a temperature range of 0-120°C. A centrifugal pump 7 provides the circulation power, pumping the heated water into the experimental platform. Flow meters 6, electric regulating valves 8, and manual valves 10 are sequentially installed on the pipeline for precise adjustment and monitoring of the water flow. The inlet 14 employs a Venturi taper 15 structure to optimize the water flow into the experimental platform. The entire system collects data in real time through sensors (such as speed sensors and temperature sensors) and transmits it to a computer for processing and analysis, thereby achieving comprehensive monitoring of the vibration and wear behavior of the heat exchange tubes.

[0023] Figure 3 The core mechanism for achieving multi-span adjustment of the heat exchanger tubes is demonstrated: a waterproof motor-driven guide rail slider mechanism 16. This mechanism includes two parallel guide rails 1611 and multiple movable sliders 1601 that can move along the guide rails. The waterproof motor 1605 drives the movable sliders 1601 to move precisely linearly via a drive screw 1608 and a screw-nut assembly 1607. The heat exchanger tube support plate 20 is fixedly mounted on the movable sliders 1601 via a support plate base 22. By controlling the waterproof motor with a computer, the positions of each support point on the guide rails can be flexibly and continuously adjusted, thereby changing the support span of the heat exchanger tubes 18 and simulating different installation and boundary conditions.

[0024] Figure 4 An adjustable gap device 21 for simulating vibration-damping strip support and measuring contact force is demonstrated. The core of this device is a sensor support block 2104, on which an acceleration sensor 2105 and a vibration-damping strip 2106 are mounted. The sensor support block 2104 is mounted on an adjustable slider 2109 by fixing bolts 2107. The gap between the vibration-damping strip 2106 and the surface of the heat exchange tube 18 can be precisely controlled by turning the set screw 2101 or by directly moving the slider 2109. This design allows the present invention to conduct in-depth research on the effects of different support gaps on the flow-induced vibration response and fretting wear characteristics of the heat exchange tube.

[0025] Figure 5The structure of the temperature-controlled water tank 9 is shown. A heating flange 303 is installed at the bottom of the tank, serving as the core heating element to provide a stable heat source for the circulating water, simulating a high-temperature working environment. The heating flange 303 integrates a temperature-controlled blind pipe (not shown separately in the diagram, but usually located near or inside the flange) for real-time monitoring of the water temperature and feeding the signal back to the computer. The water tank has an inlet 301 and an outlet 302, connecting to external pipes to form a closed high-temperature water circulation system.

Claims

1. A multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment, characterized in that, The system includes an experimental platform (12), a temperature-controlled water tank (9), a water circulation loop, and a data acquisition and control system. The experimental platform (12) is equipped with a heat exchange tube (18) and a guide rail slider mechanism (16) driven by a waterproof motor. An adjustable gap device (21) is provided on the guide rail slider mechanism. The adjustable gap device (21) can adjust the support gap between the anti-vibration strip (2106) in the device and the heat exchange tube (18). The bottom of the temperature-controlled water tank (9) is equipped with a heating flange (303). The heating flange (303) is equipped with a temperature-controlled blind tube for detecting temperature. The experimental platform (12) and the temperature-controlled water tank (9) are connected through a water circulation loop. The data acquisition and control system is used to monitor, adjust, and record the vibration, wear, and system operating parameters of the heat exchange tube (18) in real time.

2. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 1, characterized in that, The adjustable gap device (21) includes a base plate (2108), on which a slider (2109) is tunably mounted. An acceleration sensor (2105) and an anti-vibration strip (2106) are fixedly mounted on the slider (2109). The gap between the anti-vibration strip (2106) and the heat exchange tube (18) can be adjusted by adjusting the installation position of the slider (2109).

3. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 2, characterized in that, The water circulation loop includes a centrifugal pump (7), which is connected to a temperature-controlled water tank (9) via a pipe (11). The pipe (11) is equipped with a flow meter (6) for regulating and detecting water flow, an electric valve (8), a manual valve (10) for manually controlling water flow, and a pressure regulator (5) for stabilizing the internal pressure of the pipe.

4. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 1, characterized in that, The control system includes a computer (1), a sensor (3) and a temperature sensor (4). The computer (1) is connected to the sensor (3) and the temperature sensor (4) through a data acquisition card (2) for real-time data acquisition and processing.

5. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 1, characterized in that, The test platform (12) has a test inlet (14) with a Venturi tapered section (15) structure to optimize water flow distribution and reduce turbulence.

6. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 1, characterized in that, The waterproof motor-driven guide rail slider mechanism (16) includes two parallel slide rails (1611) and multiple movable sliders (1601) that can move along the slide rails (1611); each movable slider (1601) is provided with a support plate base (22) for supporting the heat exchange tube (18). By adjusting the position of the movable slider (1601) on the slide rail (1611), the span of the multi-span heat exchange tube can be continuously adjusted.

7. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 6, characterized in that, The guide rail slider mechanism (16) also includes a waterproof motor (1605). The output end of the waterproof motor (1605) is connected to a lead screw (1608). The lead screw (1608) is connected to the movable slider (1601) through a lead screw nut assembly (1607). The waterproof motor (1605) drives the lead screw nut assembly (1607) to move the movable slider (1601).

8. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 7, characterized in that, The lead screw nut assembly (1607) is connected to the lead screw (1608), the lead screw (1608) is connected to the slide rail base plate (1610) through the lead screw support seat (1609), and the waterproof motor (1605) is connected to the slide rail base plate (1610) through the lead screw fixing seat (1604).

9. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 1, characterized in that, The heat exchange tube (18) is connected to the fixed plate (17) on the experimental platform (12) via a fixed support (19).

10. The multi-span heat exchanger tube wear test bench with adjustable span and gap under high-temperature water environment as described in claim 9, characterized in that, A high-temperature piezoelectric sensor (23) is installed on the heat exchange tube (18).

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