Integrated short-distance large-pressure-drop throttling orifice device for nuclear power plant

Abstract

The utility model discloses an integrated short-distance large-pressure-drop throttling orifice device for a nuclear power plant, relates to the technical field of pipeline fluid transportation, and is used for meeting the requirement of a multi-stage throttling orifice on the process arrangement length of a circulating pipeline under the working conditions of short distance and large pressure drop, and further simplifying the installation process of the pipeline multi-stage orifice plate. The throttling orifice plate device comprises standard flanges symmetrically arranged at the two ends, and the standard flanges are connected with a tubular throttling body in a welded mode. A plurality of throttling orifice plates with middle holes are arranged in the throttling main body at intervals, and the part between every two stages of throttling orifice plates is a transition section. The throttling orifice plate device can solve the problem of cavitation of a single-stage orifice plate under the condition of large pressure drop, and excessive vibration of a circulating pipeline is avoided; under the condition that the length of a system process pipeline is limited, the short-distance large pressure drop effect is achieved; during manufacturing, cutting of multiple positions of a process system circulation pipeline can be avoided, and the convenience of mounting and dismounting of the pore plate is improved.

Description

Technical Field

[0001] This utility model patent belongs to the field of pipeline fluid transportation technology, specifically relating to an integrated short-distance high-pressure-drop throttling orifice plate device for nuclear power plants. Background Technology

[0002] Orifice plates are widely used in various fluid transport systems such as aerospace, weaponry, shipbuilding, energy and power, petrochemicals, and municipal water supply. They utilize the "throttling effect" generated when fluid flows through an orifice plate to achieve flow restriction and pressure reduction. In the design of circulation pipelines for dedicated safety facilities in nuclear power plants, orifice plates are extensively used to increase system resistance. However, single-stage orifice plates are prone to over-throttling, leading to cavitation downstream of the orifice plate. This causes pipeline vibration, noise, and flow-accelerated corrosion (FAC), posing a threat to the safe operation of the nuclear power plant. For certain high pressure drop conditions, a multi-stage continuous pressure reduction method is typically used instead of a single-stage method. This ensures that the pressure after each orifice plate is greater than the local saturated vapor pressure, preventing excessively low pressure drops and cavitation. However, using a multi-stage orifice plate method requires a distance of at least six times the pipe's inner diameter between each orifice plate, necessitates a sufficiently long process layout for the pressure reduction pipeline, and requires flanges to be installed on each orifice plate, making the process cumbersome. Utility Model Content

[0003] The purpose of this utility model is to provide an integrated short-distance, high-pressure-drop orifice plate device for nuclear power plants, which solves the requirements of multi-stage orifice plates on the length of circulation pipeline process layout under short-distance, high-pressure-drop operating conditions, and further simplifies the installation process of multi-stage orifice plates in pipelines.

[0004] The technical solution adopted by this utility model to solve its technical problem is: an integrated short-distance large pressure drop throttling orifice plate device for nuclear power plants, wherein the throttling orifice plate device includes: standard flanges symmetrically arranged at both ends, the standard flanges being welded to the tubular throttling body; and a number of throttling orifice plates with central openings being arranged at intervals inside the throttling body, the part between each two stages of throttling orifice plates being a transition section.

[0005] The aforementioned integrated short-distance high-pressure-drop orifice plate device for nuclear power plants has a standard flange that meets the requirements of ASME or RCC-M specifications.

[0006] The aforementioned integrated short-distance high-pressure-drop throttling orifice plate device for nuclear power plants includes symmetrically arranged connection holes on the standard flange for studs to pass through.

[0007] The aforementioned integrated short-distance high-pressure-drop orifice plate device for nuclear power plants, wherein the distance between the orifice plates is greater than half the inner diameter of the orifice plate device.

[0008] The aforementioned integrated short-distance high-pressure-drop orifice plate device for nuclear power plants has 3-6 orifice plates configured according to the pressure drop requirements of the pipeline.

[0009] The aforementioned integrated short-distance high-pressure-drop orifice plate device for nuclear power plants is wherein the orifice plates are parallel to each other.

[0010] The aforementioned integrated short-distance high-pressure-drop orifice plate device for nuclear power plants has a sharp edge on the inlet side of the orifice plate in the fluid inflow direction, and the orifice size on the orifice plate increases gradually along the inflow direction.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: The integrated short-distance large pressure drop throttling orifice plate device for nuclear power plants provided by this utility model adopts an integrated welded structure. On the one hand, it can solve the cavitation problem of single-stage orifice plates under large pressure drop conditions and avoid excessive vibration of circulation pipelines. Under the condition of limited system process pipeline length, it can achieve a short-distance large pressure drop effect. On the other hand, the integrated multi-stage orifice plate manufacturing can avoid multiple cuts in circulation pipelines and improve the convenience of orifice plate installation and disassembly. Attached Figure Description

[0012] Figure 1 The figure shown is a cross-sectional schematic diagram of an integrated short-distance high-pressure-drop throttling orifice plate device for nuclear power plants according to the present invention.

[0013] The labels in the diagram are as follows: 1. Standard flange; 2. Orifice plate; 3. Transition section. Detailed Implementation

[0014] To address the requirements of multi-stage orifice plates on the process layout length of circulation pipelines under short-distance, high-pressure-drop operating conditions, and to further simplify the installation process of multi-stage orifice plates, this utility model provides an integrated short-distance, high-pressure-drop orifice plate device for nuclear power plants. For example... Figure 1 As shown, the orifice plate device includes: a standard flange 1 symmetrically arranged at both ends, the standard flange 1 being welded to the tubular orifice body; the standard flange 1 meets the requirements of ASME or RCC-M specifications, and is symmetrically provided with connection holes for studs to pass through. The device is installed in the nuclear power plant circulation pipeline through the standard flange 1 and connected to the pipeline installation flange.

[0015] The orifice plate device has several orifice plates 2 with central openings spaced apart inside its main body. The section between every two orifice plates 2 is a transition section 3. The orifice plates 2 are parallel to each other, and the distance between them should be greater than half the inner diameter of the orifice plate device. The number of orifice plates 2 is configured according to the pressure drop requirements of the pipeline, ranging from 3 to 6 levels. The greater the pressure drop requirement, the more orifice plate levels are required.

[0016] The orifice plate 2 is provided with a throttling orifice opening, which should be located at the center of the orifice plate 2, and the opening shape is a circular through hole. The edge of the orifice inlet on the fluid inflow direction side of the orifice plate 2 in the orifice plate device is kept sharp and burrs are removed, and the orifice diameter on the orifice plate 2 increases progressively along the inflow direction. The orifice diameter calculation of the orifice plate 2 is performed according to NB / T20424-2017 and GB50764-2012 standards, and the pressure drop between the orifice plates can be distributed exponentially or equally.

[0017] The standard flange 1 and transition section 3, as well as the transition section 3 and orifice plate 2, are connected by butt welding. The orifice plate 2 and transition section 3 are made of carbon steel or stainless steel; to ensure the welding effect of the base material, it is recommended to use stainless steel.

[0018] It should be noted that the combination of the technical features in the embodiments of this utility model is not limited to the combination methods recorded in the embodiments of this utility model or the combination methods recorded in specific embodiments. All technical features recorded in this utility model can be freely combined or combined in any way, unless there is a contradiction between them.

[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or equivalent substitutions made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An integrated short distance high pressure drop orifice plate device for nuclear power plants, characterized by, The orifice plate device comprises: two symmetrical standard flanges (1) at both ends, which are connected with the tubular orifice body by welding; a plurality of orifice plates (2) with middle openings are arranged in the orifice body at intervals, and the part between every two orifice plates (2) is a transition section (3).

2. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 1, wherein, The standard flange (1) meets the requirements of ASME or RCC-M specification.

3. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 2, wherein, Symmetrical connecting holes for studs are arranged on the standard flange (1).

4. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 1, wherein, The distance between the orifice plates (2) is greater than half of the inner diameter of the orifice plate device.

5. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 1, wherein, The number of orifice plates (2) is configured according to the pressure drop requirement of the pipeline, and is 3-6 levels.

6. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 1, wherein, The orifice plates (2) are parallel to each other.

7. An integrated short distance high pressure drop orifice plate device for nuclear power plants as claimed in claim 1, wherein, The edge of the orifice plate (2) on the inlet side of the orifice plate (2) in the fluid inflow direction is kept sharp, and the size of the orifice plate (2) gradually increases along the inflow direction.

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