Flexible connection test platform for molten salt medium groove type solar thermal collector
By designing a test platform that includes rotary swing and pressurized buffering, the problem of verification of flexible connection reliability of molten salt medium trough solar collectors is solved, and efficient and low-cost testing is achieved, improving the stability of the equipment and simplifying operation.
Patent Information
- Application Number
- CN202422246792.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-09-13
AI Technical Summary
The prior art lacks a mature and reliable test platform for verifying the flexible connection reliability of molten salt medium trough solar heat collectors, resulting in unstable operation of the equipment and complex replacement and high cost.
A test platform including a rotary swing device, a push-pull swing device, a plane rotating mechanism, a salt-refining mechanism, a nitrogen pressurized buffer device and a salt-removing chamber is designed to simulate the actual working conditions of a flexible connection and achieve efficient testing through a torque sensor and an electric heat tracing device.
It realizes high-reliability, low-cost flexible connection tests, which can simulate the number of runs in 25 years, expand the test range, improve the reliability of the test and simplify the operation.
Smart Images
Figure CN223091506U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of trough solar collector testing, and particularly relates to a molten salt flexible connection testing platform. Background Art
[0002] Flexible connection is one of the core components of trough solar thermal power plants and is used to connect the rotating dynamic and static pipelines of trough solar collectors. Since equipment shutdown will occur after flexible connection leakage and the medium in the loop needs to be emptied during replacement, which is complex and costly, the reliability of flexible connection has a great impact on the stable operation of solar thermal power plants.
[0003] To achieve grid parity for trough solar thermal power generation, low-cost molten salt can be used to replace high-cost heat transfer oil as the heat transfer medium in trough solar collectors, raising the current heat collection temperature from 393°C to 565°C, thus significantly improving the efficiency of steam turbine generator sets. At the same time, due to the increased temperature difference between the inlet and outlet of the loop, the temperature difference between the hot salt storage tank and the cold salt storage tank can also be raised from the current 100°C to 260°C, further improving the heat storage capacity per unit mass of molten salt and significantly reducing the amount of molten salt used for heat storage.
[0004] Molten salt medium trough solar collectors greatly reduce the cost of heat transfer fluid, and the HTF system will be greatly simplified. However, there are still many factors restricting the use of molten salt as a heat transfer medium, especially the reliability of flexible connections, and there is currently no mature and reliable testing platform for verifying the reliability of flexible connections. Summary of the Utility Model
[0005] In order to overcome the above deficiencies, the utility model provides a flexible connection testing platform for molten salt medium trough solar collectors, which can restore the actual working conditions of flexible connections. Compared with the sequential system of the actual working conditions, it has a simple structure, convenient operation, high testing reliability, and low testing cost.
[0006] The main technical solution adopted in the utility model is as follows:
[0007] A flexible connection test platform for a molten salt medium trough solar collector, comprising a rotating swing device, a push-pull swing device, a plane rotating mechanism, a salt-forming mechanism, a nitrogen pressurizing buffer device and a salt discharge box, wherein the swing device is installed on a working platform and is used to drive the hard pipe section of the flexible connection to be tested to rotate, the push-pull swing device is installed on the rotating shaft of the rotating swing device and rotates with the rotating shaft, and the push-pull swing device drives the hose section of the flexible connection to be tested to swing left and right in a plane; the hard pipe section of the flexible connection to be tested is connected to one end of a fixed pipe through a plane rotating mechanism, and the other end of the fixed pipe is respectively connected to the nitrogen pressurizing buffer device and the salt-forming mechanism, the bottom of the fixed pipe is connected to the salt discharge box, which is used to store molten salt discharged from the system, and the nitrogen pressurizing buffer device is connected to a pressurized gas source.
[0008] Preferably, the rotary swing device comprises a swing cylinder, a rotating shaft and a coupling, wherein the output end of the swing cylinder is transmission-connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to one end of the hard pipe section of the flexible connection to be tested through the coupling.
[0009] Preferably, the push-pull swing device includes two fixed rods, two translation rods, a push rod and an electric push rod. The two fixed rods are parallel to each other and vertically fixed on the rotating shaft. One end of the two translation rods is hinged to the fixed rods respectively, and the two translation rods are parallel to each other. The top ends of the two translation rods are hinged to the push rod, and the push rod and the rotating shaft are parallel to each other. The push rod is connected to the hose section of the flexible connection to be tested, the fixed end of the electric push rod is fixedly installed on one of the translation rods, and the movable end of the electric push rod is connected to the other translation rod.
[0010] Preferably, the planar rotating mechanism is a planar ball head, and the hard pipe section of the flexible connection to be tested is connected to the fixed pipe through the planar ball head to achieve 360° sealed rotation.
[0011] Preferably, the rotational swing range of the swing cylinder is ±120°.
[0012] Preferably, a torque sensor is provided at the connection between the swing cylinder and the rotating shaft for real-time monitoring of the torque of the flexible connection.
[0013] Preferably, the outside of the fixed pipeline is provided with an electric heating device and a thermal insulation layer in sequence from the inside to the outside.
[0014] Beneficial effects: The utility model provides a flexible connection test platform for molten salt medium trough solar collectors, which has the following advantages:
[0015] (1) The test platform of the present utility model can restore the actual working conditions of flexible connections. Compared with the sequential system of the actual working conditions, its structure is simple, operation is convenient, and it can simulate the number of rotations in 25 years of an actual power station by continuously running for one week, which is beneficial to improving the test reliability and reducing the test cost.
[0016] (2) The output torque of the rotation and swing device of the present utility model is large, and the torque range of the product that can be tested is wide, which is beneficial to expanding its test application range. Brief Description of the Drawings
[0017] Figure 1 It is a schematic diagram of the overall structure of the present utility model
[0018] In the figure: rotation and swing device 1, rotating shaft 1-1, swing oil cylinder 1-2, coupling 1-3, torque sensor 1-4, push-pull swing device 2, fixed rod 2-1, translation rod 2-2, ejector rod 2-3, electric push rod 2-4, planar rotation mechanism 3, salt melting mechanism 4, nitrogen pressurization buffer device 5, salt discharge tank 6, working platform 7, hard pipe section 8-1, flexible pipe section 8-2, fixed pipeline 9, pressurized gas source 10, electric tracing device 11, thermal insulation layer 12. Specific Embodiments
[0019] In order to enable those skilled in the art of this technology to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this application. Embodiment
[0020] A flexible connection test platform for a molten salt medium trough solar collector, comprising a rotation and swing device 1, a push-pull swing device 2, a planar rotation mechanism 3, a salt melting mechanism 4, a nitrogen pressurization buffer device 5 and a salt discharge tank 6. Among them, the swing device 1 is installed on the working platform 7 and is used to drive the rotation of the hard pipe section 8-1 of the flexible connection to be tested. The push-pull swing device 2 is installed on the rotating shaft 1-1 of the rotation and swing device 1 and rotates with the rotating shaft 1-1. The push-pull swing device 2 drives the flexible pipe section 8-2 of the flexible connection to be tested to swing left and right in the plane. The hard pipe section 8-1 of the flexible connection to be tested is connected to one end of the fixed pipeline 9 through the planar rotation mechanism 3. The other end of the fixed pipeline 9 is respectively communicated with the nitrogen pressurization buffer device 5 and the salt melting mechanism 4. The bottom of the fixed pipeline 9 is communicated with the salt discharge tank 6 and is used to store the molten salt discharged from the system. The nitrogen pressurization buffer device 5 is connected to the pressurized gas source 10.
[0021] In Embodiment 1 of the present invention, the rotary swing device 1 includes a swing oil cylinder 1-2, a rotating shaft 1-1, and a coupling 1-3. Among them, the output end of the swing oil cylinder 1-2 is drivingly connected to one end of the rotating shaft 1-1, and the other end of the rotating shaft 1-1 is connected to one end of the rigid pipe section 8-1 to be tested for flexible connection through the coupling 1-3. A torque sensor 1-4 is also provided at the connection between the swing oil cylinder 1-2 and the rotating shaft 1-1 for real-time monitoring of the torque of the flexible connection, with a measuring range of 0-5000 N·m. In the present utility model, the swing oil cylinder 1-2 is equipped with an encoder, and through the hydraulic principle, it can achieve a rotation of ±120° of the flexible connection to be tested, with a maximum torque of 5000 N·m and a rotation speed of 1 rpm.
[0022] In the present utility model, the rotating shaft 1-1 is installed on the working platform by a rotatable support frame (such as bearing connection) to improve the rotational stability of the rotating shaft, which belongs to conventional technology and is not described in detail.
[0023] In Embodiment 1 of the present invention, the push-pull swing device 2 includes two fixed rods 2-1, two translation rods 2-2, a top rod 2-3, and an electric push rod 2-4. The two fixed rods 2-1 are fixedly arranged vertically and parallel to each other on the rotating shaft 1-1. One end of each of the two translation rods 2-2 is respectively hinged to the corresponding fixed rod 2-1, and the two translation rods 2-2 are parallel to each other. The tops of the two translation rods 2-2 are hinged to the top rod 2-3, and the top rod 2-3 is parallel to the rotating shaft 1-1. The top rod 2-3 is connected to the flexible pipe section 8-2 to be tested for flexible connection. The fixed end of the electric push rod 2-4 is fixedly installed on one of the translation rods 2-2, and the movable end of the electric push rod 2-4 is connected to the other translation rod 2-2. In the present utility model, the two translation rods and the top rod form a plane with an adjustable displacement amount in the left and right directions, thereby driving the flexible pipe section 8-2 of the flexible connection to be tested to swing left and right. In Embodiment 1 of the present invention, the electric push rod 2-4 is equipped with a position feedback sensor, and through pushing and pulling, it realizes the left and right direction swing of the flexible connection in the plane, and the flexible pipe section 8-2 of the flexible connection to be tested can absorb the displacement amount generated by the left and right direction swing.
[0024] In Embodiment 1 of the present invention, the planar rotation mechanism 3 is a planar ball head, which is sealed inside, and the rigid pipe section 8-1 to be tested for flexible connection is connected to the fixed pipe 9 through the planar ball head to achieve 360° sealed rotation.
[0025] In Embodiment 1 of the present invention, an electric tracing device 11 and a heat insulation layer 12 are sequentially arranged on the outside of the fixed pipe 9 from the inside to the outside, so that after the molten salt is injected into the fixed pipe 9, the temperature can be maintained.
[0026] In Embodiment 1 of the present invention, the nitrogen pressurization buffer mechanism 5 includes a nitrogen tank, and is provided with a safety valve, an exhaust valve, a pressure gauge, etc., which belong to conventional settings and are not described in detail.
[0027] In Embodiment 1, the pressurized gas source 10 uses a high-pressure nitrogen cylinder as the pressurized gas source of the test platform, which is equipped with a pressure reducing valve, an electric intake valve, etc. This belongs to a conventional setting and thus will not be elaborated in detail.
[0028] In Embodiment 1, the salt melting mechanism 4 includes a salt melting tank, and the salt melting tank is internally provided with an electric heater, a temperature sensor, and a heat preservation layer. A salt injection valve is provided below the salt melting tank to control the injection of molten salt into the fixed pipeline.
[0029] The present utility model uses a non-circulating, nitrogen pressurization, and electric tracing temperature maintenance method to conduct a live simulation test on the flexible connection to be tested. Among them, the inner part of the hose section of the flexible connection to be tested is a metal bellows, which is self-equipped with electric tracing, a temperature sensor, and a heat preservation layer. The specific test method is as follows:
[0030] a. The molten salt is pre-mixed in proportion (60% NaNO3 + 40% KNO3) and filled into the salt melting tank of the salt melting mechanism 4.
[0031] b. Open the electric heater of the salt melting mechanism 4 to completely melt the molten salt in the salt melting tank into a liquid. At the same time, use the electric tracing device to heat the fixed pipeline 9 and the hose section 8-2 of the flexible connection to be tested to 350 °C and keep it warm for 4 hours.
[0032] c. Open the salt injection valve at the lower part of the salt melting mechanism 4, so that the molten salt flows into the fixed pipeline 9 of the test platform and the pipeline of the flexible connection to be tested (including the hose section and the hard pipe section) under the action of gravity. Pay attention to exhausting the air at the top of the hose section to ensure that the pipeline is filled with molten salt.
[0033] d. The nitrogen cylinder in the nitrogen pressurization buffer device 5 is a pressure vessel. The pressurized gas source (high-pressure nitrogen cylinder) pressurizes the entire system to the required pressure of 4.5 MPa through a control valve.
[0034] e. The electric tracing devices of all pipelines (including the fixed pipeline and the hose section of the flexible connection to be tested) control the heating temperature to be stabilized at 540 °C through thermocouples.
[0035] f. Under the conditions of a temperature of 540 °C and a pressure of 4.5 MPa, start the swing oil cylinder and the electric push rod for testing, and a total of 11,000 tests are conducted. Among them, the swing oil cylinder drives the flexible connection to be tested to rotate by ±120°, with a maximum torque of 5000 N·m and a rotation speed of 1 rpm. The electric push rod realizes the left-right swing of the flexible connection in the plane through pushing and pulling.
[0036] In the test platform of the present utility model, there are a total of two molten salt valves on the molten salt side, including the side of the salt melting tank and the side of the salt discharging tank, and blind plates can be used for sealing to prevent pressure leakage of the molten salt valves.
[0037] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.
Claims
1. A flexible connection test platform for a molten salt medium trough solar collector, characterized in that It includes a rotating and swinging device, a push-pull swinging device, a plane rotating mechanism, a salt-forming mechanism, a nitrogen pressurizing buffer device and a salt discharge box, wherein the swinging device is installed on a working platform and is used to drive the hard pipe section of the flexible connection to be tested to rotate, the push-pull swinging device is installed on the rotating shaft of the rotating and swinging device and rotates with the rotating shaft, and the push-pull swinging device drives the hose section of the flexible connection to be tested to swing left and right in a plane; the hard pipe section of the flexible connection to be tested is connected to one end of a fixed pipeline through a plane rotating mechanism, and the other end of the fixed pipeline is respectively connected to the nitrogen pressurizing buffer device and the salt-forming mechanism, the bottom of the fixed pipeline is connected to the salt discharge box, which is used to store molten salt discharged from the system, and the nitrogen pressurizing buffer device is connected to a pressurized gas source.
2. The flexible connection test platform for the molten salt medium trough solar collector according to claim 1, characterized in that The rotary swing device includes a swing cylinder, a rotating shaft and a coupling, wherein the output end of the swing cylinder is transmission-connected to one end of the rotating shaft, and the other end of the rotating shaft is connected to one end of the hard pipe section of the flexible connection to be tested through the coupling.
3. The flexible connection test platform for a molten salt medium trough solar collector according to claim 1, wherein The push-pull swing device includes two fixed rods, two translation rods, a push rod and an electric push rod. The two fixed rods are parallel to each other and vertically fixed on the rotating shaft. One end of the two translation rods is hinged to the fixed rods respectively, and the two translation rods are parallel to each other. The top ends of the two translation rods are hinged to the push rod, and the push rod and the rotating shaft are parallel to each other. The push rod is connected to the hose section of the flexible connection to be tested. The fixed end of the electric push rod is fixedly installed on one of the translation rods, and the movable end of the electric push rod is connected to the other translation rod.
4. The flexible connection test platform for the molten salt medium trough solar collector according to claim 1, characterized in that, The plane rotation mechanism is a plane ball head, and the hard pipe section of the flexible connection to be tested is connected to the fixed pipeline through the plane ball head to achieve 360° sealing rotation.
5. The flexible connection test platform for a molten salt medium trough solar collector according to claim 2, characterized in that The rotational swing range of the swing cylinder is ±120°.
6. The flexible connection test platform for a molten salt medium trough solar collector according to claim 2, characterized in that, A torque sensor is provided at the connection between the swing cylinder and the rotating shaft for real-time monitoring of the torque of the flexible connection.
7. The flexible connection test platform for a molten salt medium trough solar collector according to claim 1, characterized in that, The outside of the fixed pipeline is sequentially provided with an electric heating device and a thermal insulation layer from the inside to the outside.