Flow equalizing device for measuring flow of fused salt pipeline

Abstract

According to the flow equalizing device for measuring the flow of the molten salt pipeline provided by the embodiment of the invention, the first flow equalizing assembly is arranged at the inlet of the vertical pipeline of the molten salt pipeline, and the molten salt fluid is subjected to primary flow equalizing, so that turbulent flow and bias flow generated by high viscosity or temperature fluctuation of the molten salt fluid are inhibited; the second flow equalizing assembly is arranged on the bent pipe section of the fused salt pipeline, and the fused salt fluid flowing through the first flow equalizing assembly is further equalized, so that the local vortex of the fused salt fluid is eliminated; a flowmeter is installed in a preset flowmeter installation area of the fused salt pipeline to measure the flow of the fused salt fluid, and the error of the flowmeter is controlled within + / -1.5%. Through the synergistic effect of the first flow equalizing assembly and the second flow equalizing assembly, the precision of molten salt pipeline flow measurement and the system operation efficiency are remarkably improved. The flow equalizing device is not only suitable for high-temperature molten salt systems for photo-thermal power generation, molten salt energy storage, nuclear energy and the like, but also can be expanded to the field of high-viscosity chemical fluid monitoring, and has remarkable economic benefits and engineering universality.

Description

Technical Field

[0001] Embodiments of the present disclosure belong to the technical field of high-temperature fluid measurement, and particularly relate to a flow equalizing device for measuring the flow rate of molten salt pipelines. Background Art

[0002] The application of molten salt pipeline flow measurement technology in fields such as solar thermal power generation and high-temperature energy storage faces significant technical bottlenecks. Due to inherent defects, the flow measurement systems of traditional pipelines show obvious inadaptability when dealing with the characteristics of molten salt media. Molten salt has high viscosity characteristics and significant temperature sensitivity, and it is extremely easy to form an asymmetric flow pattern in a conventional straight pipe section. Especially in areas where the pipeline turns or changes in diameter, continuous vortices and uneven flows will occur. This unsteady flow field directly leads to a non-linear characteristic in the velocity distribution of the measurement cross-section, making the single-point or local measurement data unable to accurately reflect the true flow rate value. Among them, ultrasonic flowmeters and differential pressure flowmeters are most affected by this. When the Reynolds number is lower than the critical value, the measurement error of existing instruments can reach more than 3 times the nominal accuracy.

[0003] In view of the above problems, it is necessary to propose a flow equalizing device for measuring the flow rate of molten salt pipelines that is reasonably designed and can effectively solve the above problems. Summary of the Invention

[0004] Embodiments of the present disclosure aim to at least solve one of the technical problems existing in the prior art, and provide a flow equalizing device for measuring the flow rate of molten salt pipelines.

[0005] Embodiments of the present disclosure provide a flow equalizing device for measuring the flow rate of molten salt pipelines, including a molten salt pipeline, a first flow equalizing component, and a second flow equalizing component;

[0006] The molten salt pipeline is successively provided with a vertical pipe section, a bent pipe section, and a horizontal pipe section from its inlet;

[0007] The first flow equalizing component is arranged at the inlet of the vertical pipe section and is used for preliminarily equalizing the molten salt fluid to suppress the turbulence and uneven flow generated by the molten salt fluid due to high viscosity or temperature fluctuations;

[0008] The second flow equalizing component is arranged at the outlet of the bent pipe section and is used for further equalizing the molten salt fluid flowing through the first flow equalizing component to eliminate the local vortices of the molten salt fluid;

[0009] A preset flowmeter installation area is arranged on the horizontal pipe section.

[0010] Optionally, the distance between the preset flowmeter installation area and the second flow equalizing component is 2 to 3 times the hydraulic radius.

[0011] Optionally, the first flow equalizing component includes a plurality of support rods and a plurality of connecting rods;

[0012] A plurality of the support rods are radially distributed outward from the center.

[0013] A plurality of the connecting rods are arranged at intervals in the radial direction and connected between the support rods, so that the first flow equalizing assembly has a grid-like structure.

[0014] Optionally, a plurality of the support rods extend outward from the center in a radial skeleton structure.

[0015] Optionally, a plurality of the connecting rods are arranged at equal intervals in the meridional direction.

[0016] Optionally, a plurality of the connecting rods are all circular.

[0017] Optionally, the second flow equalizing assembly includes a plurality of flow equalizing plates distributed in a gradient manner, and flow equalizing channels are formed between the plurality of flow equalizing plates; wherein,

[0018] An inlet of the flow equalizing channel is connected to the molten salt fluid in the vertical pipe section;

[0019] An outlet of the flow equalizing channel is connected to the molten salt fluid in the horizontal section.

[0020] Optionally, areas of the plurality of flow equalizing plates gradually increase from the inside to the outside of the elbow section.

[0021] Optionally, each of the flow equalizing plates is arc-shaped, and a bending direction of each of the flow equalizing plates is the same as a bending direction of the elbow section.

[0022] Optionally, a plurality of flow equalizing plates are arranged at equal intervals.

[0023] The flow equalizing device for molten salt pipeline flow measurement according to the embodiment of the present disclosure preliminarily equalizes the molten salt fluid by arranging a first flow equalizing assembly at an inlet of a vertical pipeline of the molten salt pipeline, so as to suppress turbulence and crossflow generated by the molten salt fluid due to high viscosity or temperature fluctuation; further equalizes the molten salt fluid flowing through the first flow equalizing assembly by arranging a second flow equalizing assembly in the elbow section of the molten salt pipeline, so as to eliminate local eddy currents of the molten salt fluid; installs a flowmeter in a preset flowmeter installation area of the molten salt pipeline to measure the flow of the molten salt fluid. Through the synergistic effect of the first flow equalizing assembly and the second flow equalizing assembly and the setting of the preset flowmeter installation area, the accuracy of molten salt pipeline flow measurement and the system operation efficiency are significantly improved. The flow equalizing device is not only applicable to high-temperature molten salt systems such as solar thermal power generation, molten salt energy storage, and nuclear energy, but also can be extended to the field of high-viscosity chemical fluid monitoring, and has remarkable economic benefits and engineering universality. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of a flow equalizing device for molten salt pipeline flow measurement according to an embodiment of the present disclosure;

[0025] Figure 2 This is a schematic structural diagram of the first flow equalizing component in the embodiments of the present disclosure. Specific embodiments

[0026] To enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the following further describes the embodiments of the present disclosure in detail with reference to the accompanying drawings and specific embodiments.

[0027] To solve the problem that ultrasonic or differential pressure type flow measurement devices in molten salt pipelines cannot accurately reflect the true flow value due to the inherent physical properties of the molten salt working medium and the structure of the transport elbow. As Figure 1 shown, the embodiments of the present disclosure provide a flow equalizing device 100 for measuring the flow rate of a molten salt pipeline, including a molten salt pipeline, a first flow equalizing component 120, and a second flow equalizing component 130.

[0028] The molten salt pipeline is successively provided with a vertical pipe section 111, an elbow pipe section 112, and a horizontal pipe section 113 from its inlet.

[0029] The first flow equalizing component 120 is arranged at the inlet of the vertical pipe section 111 and is used to preliminarily equalize the molten salt fluid to suppress the turbulence and deviation flow generated by the molten salt fluid due to high viscosity or temperature fluctuation.

[0030] The second flow equalizing component 130 is arranged at the outlet of the elbow pipe section 112 and is used to further equalize the molten salt fluid flowing through the first flow equalizing component 120 to eliminate the local eddy current of the molten salt fluid.

[0031] The horizontal pipe section 113 is provided with a preset flowmeter installation area A for installing a flowmeter.

[0032] Specifically, when the high-temperature molten salt fluid flows through the molten salt pipeline, it first flows through the first flow equalizing component 120 arranged at the inlet of the vertical pipe section 111. The first flow equalizing component 120 preliminarily equalizes the molten salt fluid to suppress the turbulence and deviation flow generated by the molten salt fluid due to high viscosity or temperature fluctuation, ensuring that the molten salt fluid enters the subsequent pipe section at a relatively uniform flow rate. When the molten salt fluid after passing through the first flow equalizing component 120 flows through the elbow pipe section 112, it flows through the second flow equalizing component 130. The second flow equalizing component 130 further equalizes the molten salt fluid to eliminate the local eddy current of the molten salt fluid, enabling the molten salt fluid to form a stable laminar flow in the horizontal pipe section 113, ensuring that the molten salt at the preset flowmeter installation area of the horizontal pipe section 113 is in a laminar flow state, and controlling the measurement error of the flowmeter within ±1.5%. Ensure that the measurement section meets the ISO standard and meets the flow measurement conditions.

[0033] It should be noted that both the first flow equalizing component 120 and the second flow equalizing component 130 can be independently arranged in the molten salt pipeline. That is to say, the first flow equalizing component 120 and the second flow equalizing component 130 can be installed at corresponding positions of the molten salt pipeline in a modular structure according to the needs of the molten salt pipeline without additional reinforcement, and the installation is convenient.

[0034] For the flow equalizing device for molten salt pipeline flow measurement in the embodiments of the present disclosure, through the synergistic effect of the first flow equalizing component and the second flow equalizing component combined with the setting of the preset flowmeter installation area, the accuracy of molten salt pipeline flow measurement and the system operation efficiency are significantly improved. This flow equalizing device is not only applicable to high-temperature molten salt systems such as solar thermal power generation, molten salt energy storage, and nuclear energy, but also can be extended to the field of high-viscosity chemical fluid monitoring, with significant economic benefits and engineering universality.

[0035] Exemplarily, the preset flowmeter installation area A is 2 to 3 times the hydraulic radius away from the second flow equalizing component 130. This position is determined to be the fully developed section of the fluid in the molten salt pipeline. A standardized flowmeter interface (flange or threaded hole) is reserved in the preset flowmeter installation area, and ultrasonic and differential pressure flowmeters are adapted to ensure the comparability and repeatability of data measurement.

[0036] In this embodiment, the flowmeter is set in the preset flowmeter installation area A, which conforms to the setting of the standardized flow measurement point position, ensuring that the measurement section conforms to the ISO standard, and the flowmeter error can be controlled within ±1.5%.

[0037] Exemplarily, as Figure 2 shown, the first flow equalizing component 120 includes a plurality of support rods 121 and a plurality of connecting rods 122.

[0038] The plurality of support rods 121 are radially distributed outward from the center.

[0039] The plurality of connecting rods 122 are arranged at intervals in the radial direction and are connected between the support rods 121, so that the first flow equalizing component 120 has a grid-like structure.

[0040] In this embodiment, when the high-temperature molten salt fluid flows through the first flow equalizing component 120 with a grid-like structure, the high-temperature molten salt fluid can be preliminarily shunted through the dense flow channels to effectively suppress the turbulence and deviation phenomena of the fluid caused by high viscosity or temperature fluctuations, and ensure that the fluid enters the subsequent pipe section at a relatively uniform flow rate.

[0041] As Figure 2 shown, the plurality of support rods 121 extend radially outward from the center to form a radial skeleton structure. The plurality of connecting rods 122 are arranged at equal intervals in the meridional direction. The plurality of connecting rods are all circular. That is to say, the first flow equalizing component 120 can adopt a flow equalizing grid. This flow equalizing grid has a simple structure, is easy to install, and has high strength and durability.

[0042] Exemplarily, as Figure 1 shown, the second flow equalizing component 130 includes a plurality of flow equalizing plates distributed in a gradient manner, and flow equalizing channels are formed between the plurality of flow equalizing plates; wherein, the inlet of the flow equalizing channel is connected to the molten salt fluid in the vertical pipe section 111; the outlet of the flow equalizing channel is connected to the molten salt fluid in the horizontal section 113.

[0043] In this embodiment, the high-temperature molten salt fluid from the vertical pipe section 111 flows through each flow equalizing channel in sequence from the inlet of the flow equalizing channel and then flows into the horizontal pipe section 113 through the outlet of the flow equalizing channel. By eliminating local eddy currents through the aperture gradient distribution, the flow rate of the molten salt fluid is further balanced, so that the molten salt fluid forms a stable laminar flow in the horizontal pipe section 113, ensuring that the molten salt fluid at the flowmeter is in a laminar flow state.

[0044] Exemplarily, as Figure 1 shown, the areas of the plurality of flow equalizing plates gradually increase from the inside to the outside of the elbow section 112. Each flow equalizing plate is arc-shaped, and the bending direction of each flow equalizing plate is the same as the bending direction of the elbow section 112. That is to say, the plurality of flow equalizing plates are arranged to adapt to the shape of the elbow section 112.

[0045] Exemplarily, the plurality of flow equalizing plates are arranged at equal intervals. That is to say, the widths of the plurality of flow equalizing channels are the same, so as to better equalize the molten salt fluid, so that the molten salt fluid forms a stable laminar flow in the horizontal pipe section 113.

[0046] It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principles of the embodiments of the present disclosure. However, the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also regarded as the protection scope of the embodiments of the present disclosure.

Claims

1. A flow equalizing device for molten salt pipeline flow measurement, characterized in that, It includes a molten salt pipeline, a first flow equalizing component and a second flow equalizing component; The molten salt pipeline is sequentially provided with a vertical pipe section, a bent pipe section and a horizontal pipe section from its inlet; The first flow equalizing component is arranged at the inlet of the vertical pipe section and is used for initially equalizing the flow of the molten salt fluid to suppress the turbulence and uneven flow generated by the molten salt fluid due to high viscosity or temperature fluctuations; The second flow equalizing component is arranged at the outlet of the bent pipe section and is used for further equalizing the flow of the molten salt fluid flowing through the first flow equalizing component to eliminate the local eddy current of the molten salt fluid; A preset flowmeter installation area is arranged on the horizontal pipe section.

2. The current sharing device according to claim 1, wherein The preset flowmeter installation area is 2 to 3 times the hydraulic radius away from the second flow equalizing component.

3. The current sharing device according to claim 1, wherein, The first flow equalizing component includes a plurality of support rods and a plurality of connecting rods; The plurality of support rods are radially distributed outward from the center; The plurality of connecting rods are arranged at intervals in the radial direction and are connected between the support rods, so that the first flow equalizing component has a grid-like structure.

4. The current sharing device according to claim 3, characterized in that The plurality of support rods extend radially outward from the center to form a radial skeleton structure.

5. The current sharing device according to claim 3, wherein The plurality of connecting rods are arranged at equal intervals in the meridional direction.

6. The current sharing device according to claim 3, characterized in that, The plurality of connecting rods are all circular.

7. The current sharing device according to claim 1, characterized in that, The second flow equalizing component includes a plurality of flow equalizing plates distributed in a gradient manner, and a flow equalizing channel is formed between the plurality of flow equalizing plates; wherein, The inlet of the flow equalizing channel is connected to the molten salt fluid in the vertical pipe section; The outlet of the flow equalizing channel is connected to the molten salt fluid in the horizontal section.

8. The current sharing device according to claim 7, characterized in that The areas of the plurality of flow equalizing plates gradually increase from the inside to the outside of the bent pipe section.

9. The current sharing device according to claim 7, characterized in that, Each flow equalizing plate is arc-shaped, and the bending direction of each flow equalizing plate is the same as the bending direction of the bent pipe section.

10. The current sharing device according to claim 8, wherein The plurality of flow equalizing plates are arranged at equal intervals.

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