A solid cone eliminator for water hammer in the condensate downpipe of an air-cooled island and its preparation method

Abstract

This invention discloses a solid cone eliminator device and its preparation method for water hammer in the condensate downcomer of an air-cooled island. The device includes an outer cylinder, a solid cone disposed inside the outer cylinder, a support plate, and a stop block. The outer cylinder is connected in series within the condensate downcomer of the air-cooled island. The solid cone is fixed inside the outer cylinder by the support plate, with its tip facing the direction of condensate flow. A guide hole is provided on the side wall of the solid cone, located slightly above the bottom of the cone, with the borehole axis parallel to the center line of the cone and inclined outward at an angle α. The stop block is welded between the inner wall of the outer cylinder and the support plate to reinforce the support structure. This invention effectively disrupts the conditions for water hammer and surge formation, ensuring long-term safe and stable operation of the system. It addresses the problem of water hammer shock waves in the condensate downcomer of an air-cooled island induced by complex and variable environmental conditions in winter.

Description

Technical Field

[0001] This invention relates to a solid cone eliminator for water hammer in the condensate downpipe of an air-cooled island and its preparation method, belonging to the technical field of solid cone eliminators for water hammer in downpipes. Background Technology

[0002] With economic development and a steady improvement in living standards, the demand for electricity from industrial and agricultural production is increasing. Traditional small-capacity generator sets, limited by their efficiency and coal consumption, as well as environmental pressures, are no longer suitable for modern market demands and are gradually being phased out. Correspondingly, high-parameter, large-capacity, high-efficiency, and environmentally friendly generator sets, especially large-capacity direct air-cooled units in water-scarce northern regions, are developing rapidly. However, design and manufacturing units lack sufficient theoretical research and modeling studies on water hammer problems induced by the complex and variable winter operating conditions in the condensate downcomer of the air-cooled island. Hastily constructed units commonly suffer from pipe vibration, leakage, and pipeline damage caused by water hammer and water surge waves in winter, endangering the safe and stable operation of the units and causing significant economic losses to power generation companies due to shutdowns. Given the water hammer hazard in the condensate downcomer of direct air-cooled units during winter, and the current inability of pipeline reinforcement methods to eliminate water hammer conditions, there is an urgent need for a water hammer eliminator and its preparation method to effectively solve this thorny problem. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and to overcome the water hammer shock wave problem in the condensate downcomer of the air-cooled island induced by the complex and variable environmental conditions in winter, and to provide a solid cone eliminator device for water hammer in the condensate downcomer and its preparation method. To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution: First aspect: A solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island, comprising an outer cylinder, a solid cone disposed inside the outer cylinder, a support plate, and a stop block; The outer cylinder is used to be installed in series in the condensate downcomer of the air-cooled island; The solid cone is fixed inside the outer cylinder by the support plate, and the tip of the solid cone faces the direction from which the condensate flows. The solid cone has a flow guide hole on its side wall. The flow guide hole is located on the circumference slightly above the bottom of the solid cone, and the drilling axis is parallel to the center line of the solid cone and inclined outward at an angle α. The stop block is welded between the inner wall of the outer cylinder and the support plate to reinforce the support structure.

[0004] Optionally, the solid cone has a conical structure with a top included angle θ of 53.13°±0.5°.

[0005] Optionally, the tilt angle α of the guide hole is 10°±0.5°.

[0006] Optionally, the diameter of the guide hole is Φ18 mm - Φ25 mm.

[0007] Optionally, the number and arrangement of the guide holes satisfy the following flow area requirements: The sum of the borehole flow area and the area between the bottom of the cone and the inner wall of the pipe is less than the original design flow area of ​​the pipe. When a single-ring guide hole cannot meet the above-mentioned flow area requirements, a second or multiple rings of guide holes are arranged staggered upwards along the axis of the solid cone.

[0008] Optionally, when the number of guide holes is limited due to structural constraints and the flow area requirement cannot be met by increasing the number of turns, the outer cylinder is connected to a transition section with a large and small end, thereby increasing the circumferential length of the guide holes or the area of ​​the annular gap by increasing the diameter of the outer cylinder.

[0009] Optionally, the support plate consists of two pieces, arranged in a cross shape and welded to the inner wall of the outer cylinder; the solid cone is welded and fixed to the cross-shaped support plate. The number of the baffles is multiple, and they are respectively welded to the inner wall of the outer cylinder and the downstream side of the support plate in the direction of water flow.

[0010] Optionally, the device is installed on the condensate downcomer of the air-cooled island at the following locations: one set is installed at one-third of the distance from the top of the pipe, and another set is installed at one-third of the distance from the bottom of the pipe.

[0011] The second aspect: A method for preparing a solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island as described in the first aspect, comprising the following steps: Step S1: Select a pipe of the same material and specification as the original pipe or a pipe that has been transitioned by reducing ends as the outer cylinder, and perform beveling. Step S2: Make a solid cone and drill guide holes at the designated positions and preset angles; Step S3: Make the cross-shaped support plate and stops; Step S4: Fully weld the support plate to the inner wall of the outer cylinder, with a weld height of not less than 6mm; Step S5: Weld the solid cone to the support plate and weld the stop block between the inner wall of the outer cylinder and the support plate. All welds must be fully welded and the weld height is 6mm. Step S6: Hoist the device to the predetermined position of the condensate downcomer pipe, adjust the direction so that the top of the solid cone faces the direction of water flow, and perform butt welding or flange connection.

[0012] Optionally, the machining accuracy of the top included angle of the solid cone is controlled at 53.13∘±0.5∘, and the machining accuracy of the tilt angle of the guide hole is controlled at 10∘±0.5∘.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. The device of the present invention can solve the problem of protecting equipment from damage by disrupting the conditions for water hammer formation caused by changes in winter working conditions; 2. Unlike general reinforcement measures on pipelines, this invention can effectively disrupt the conditions for water hammer and surge formation, ensuring the long-term safe and stable operation of the system. 3. Flexible connection method: depending on the site environment, the device can be connected to the original pipeline by welding or by flange; 4. The solid cone structure can be made in various forms, including conical shapes and other personalized structural forms. 5. This device is a mechanical device without measurement, control, or other power systems, making it simple to inspect and maintain, and durable. Attached Figure Description

[0014] Figure 1 The diagram shown is a schematic diagram of the solid cone eliminator device for water hammer in the condensate drop pipe of the air-cooled island according to the present invention. In the diagram: 1. Outer cylinder; 2. Solid cone; 3. Stop block; 4. Stop block. Detailed Implementation

[0015] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0016] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0018] Example 1, as Figure 1 As shown, a solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island is disclosed, including an outer cylinder 1, a solid cone 2 disposed inside the outer cylinder 1, a support plate 4, and a stop block 3. The outer cylinder 1 is used to be installed in series in the condensate downcomer of the air-cooled island; the outer cylinder 1 uses the same material and specifications as the original design pipe, and the internal solid cone 2, stop block 2, and support plate 4 can be made of stainless steel or #45 steel. The solid cone 2 is fixed inside the outer cylinder 1 by the support plate 4, and the tip of the solid cone 2 faces the direction from which the condensate flows; the stop block 3 is welded between the inner wall of the outer cylinder 1 and the support plate 4 to reinforce the support structure. The solid cone 2 has a flow guide hole on its side wall. The flow guide hole is located on the circumference slightly above the bottom of the solid cone 2, and the drilling axis is parallel to the center line of the solid cone and tilted outward at an angle α. The tilt angle α of the flow guide hole is 10°±0.5°, and is preferably 10° in this embodiment.

[0019] To avoid water hammer conditions caused by condensate drop and fluctuating pipe wall pressure due to vacuum changes caused by atmospheric conditions and unit load variations during winter operation, the above technical solution involves drilling holes at a 10° angle outward from the base of the solid cone, slightly above the centerline, to guide the water flow towards the center of the pipe.

[0020] In this embodiment, the solid cone 2 is a conical structure with a top angle θ of 53.13° ± 0.5°, preferably 53.13°. In this embodiment, the diameter of the guide hole is Φ18 mm-Φ25 mm. When a single ring of guide holes cannot meet the above-mentioned flow area requirements, a second or multiple rings of guide holes are arranged upwards along the axis of the solid cone 2.

[0021] In this embodiment, the preferred borehole diameter is Φ25mm. The total flow area of ​​the drilled borehole plus the area between the bottom of the cone and the inner wall of the pipe is slightly smaller than the original design flow area of ​​the pipe. When the flow area of ​​one borehole does not meet the requirements, a second borehole can be drilled upwards at a staggered and uniform distance, and so on.

[0022] In this embodiment, when the number of guide holes is limited due to structural constraints and the flow area requirement cannot be met by increasing the number of turns, a transition section with a reducing head is connected to one or both ends of the outer cylinder 1. By increasing the diameter of the outer cylinder 1, the circumference length of the guide holes or the area of ​​the annular gap is increased. After installing this device, the flow area should, in principle, be slightly smaller than the original design flow area, generally taking 95% to 100% of the original design flow area.

[0023] In this embodiment, the support plate 4 consists of two pieces, arranged in a cross shape and welded to the inner wall of the outer cylinder 1; the solid cone 2 is welded and fixed to the cross-shaped support plate 4; the two support plates are arranged in a cross shape, the solid cone is welded and placed on the support plate, and four baffles (50×30×30) are respectively welded to the inner wall of the outer cylinder 1 and the downstream side of the support plate 4 in the direction of water flow.

[0024] In this embodiment, the device is installed on the condensate downcomer of the air-cooled island at the following positions: one set is installed at one-third of the distance from the top of the pipe, and another set is installed at one-third of the distance from the bottom of the pipe.

[0025] All of the above-mentioned welded parts must be fully welded, with a weld height of 6mm.

[0026] Example 2: A method for preparing a solid cone eliminator for water hammer in the condensate downcomer of an air-cooled island is disclosed, comprising the following steps: Step S1: Select a pipe of the same material and specification as the original pipe or a pipe after transitioning through reducers as the outer cylinder 1, and perform beveling; Step S2: Make a solid cone 2 and drill guide holes at the designated positions and preset angles; Step S3: Make the cross-shaped support plate 4 and the stop block 3; Step S4: Fully weld the support plate 4 to the inner wall of the outer cylinder 1, with a weld height of not less than 6mm; Step S5: Weld the solid cone 2 to the support plate 4, and weld the stop block 3 between the inner wall of the outer cylinder 1 and the support plate 4. All welds must be fully welded, and the weld height is 6mm. Step S6: Hoist the device to the predetermined position of the condensate downcomer pipe, adjust the direction so that the top of the solid cone 2 faces the direction of water flow, and perform butt welding or flange connection.

[0027] In step S2, the machining accuracy of the top included angle of the solid cone 2 is controlled at 53.13∘±0.5°, and the machining accuracy of the tilt angle of the guide hole is controlled at 10∘±0.5°.

[0028] See Figure 1To prevent water hammer oscillations from causing pipe leaks and support damage to the downcomer pipes of direct air-cooled units due to changes in environmental conditions during winter, this device can effectively avoid the conditions that generate water hammer and ensure the safety of the air-cooled island equipment and piping system.

[0029] Field application description of the embodiments of the present invention: 1. During the fabrication of this device, the processing of accessories, prefabrication of bevels, selection of welding materials, welding and post-weld heat treatment processes must meet the relevant specifications. If necessary, the welding process can be evaluated. 2. The top of the solid cone is tightly sealed; 3. This device can be implemented during unit overhauls or planned long-term shutdowns; 4. Before implementation, the piping system must be effectively isolated to prevent mechanical debris generated during the implementation process from falling into the downcomer. 5. Clean the inside of the device before implementation to ensure that it is clean and free of debris; 6. Install the device according to the marked direction (the top of the solid cone should face the direction of water flow). The outer cylinder of the device and the pipe should be aligned straight, the beveling should be done in accordance with the specifications, and the welding process should meet the standard requirements.

[0030] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A solid cone eliminator device for water hammer in the condensate downcomer of an air-cooled island, characterized in that, It includes an outer cylinder (1), a solid cone (2) disposed inside the outer cylinder (1), a support plate (4), and a stop block (3); The outer cylinder (1) is used to be installed in series in the condensate downcomer of the air-cooled island; The solid cone (2) is fixed inside the outer cylinder (1) by the support plate (4), and the tip of the solid cone (2) faces the direction of the condensate flow. The solid cone (2) has a flow guide hole on its side wall. The flow guide hole is located on the circumference slightly above the bottom of the solid cone (2), and the drilling axis is parallel to the center line of the solid cone and tilted outward at an angle α. The stop block (3) is welded between the inner wall of the outer cylinder (1) and the support plate (4) to reinforce the support structure.

2. The solid cone eliminator device for water hammer in the condensate downpipe of the air-cooled island according to claim 1, characterized in that, The solid cone (2) has a conical structure with a top included angle θ of 53.13°±0.5°.

3. The solid cone eliminator device for water hammer in the condensate downpipe of the air-cooled island according to claim 1, characterized in that, The tilt angle α of the guide hole is 10°±0.5∘.

4. The solid cone eliminator device for water hammer in the condensate downpipe of the air-cooled island according to claim 1, characterized in that, The diameter of the guide hole is Φ18 mm-Φ25 mm.

5. The solid cone eliminator device for water hammer in the condensate downpipe of the air-cooled island according to claim 1, characterized in that, The number and arrangement of the guide holes satisfy the flow area requirement: The sum of the borehole flow area and the area between the bottom of the cone and the inner wall of the pipe is less than the original design flow area of ​​the pipe. When a single-ring guide hole cannot meet the flow area requirement, a second or multiple rings of guide holes are arranged upwards along the axis of the solid cone (2).

6. The solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island according to claim 1, characterized in that, When the number of guide holes is limited due to structural constraints and the flow area requirement cannot be met by increasing the number of turns, the outer cylinder (1) is connected to a transition section with a large and small head at both ends or one end. The diameter of the outer cylinder (1) is increased to increase the circumferential length of the guide holes or the area of ​​the annular gap.

7. The solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island according to claim 1, characterized in that, The support plate (4) consists of two pieces, which are arranged in a cross shape and welded to the inner wall of the outer cylinder (1); the solid cone (2) is welded and fixed to the cross-shaped support plate (4); the number of the baffles (3) is multiple, which are respectively welded to the inner wall of the outer cylinder (1) and the downstream side of the support plate (4) in the direction of water flow.

8. The solid cone eliminator device for water hammer in the condensate downpipe of the air-cooled island according to claim 1, characterized in that, The device is installed on the condensate downcomer of the air-cooled island at the following locations: one set is installed at one-third of the distance from the top of the pipe, and another set is installed at one-third of the distance from the bottom of the pipe.

9. A method for preparing a solid cone eliminator device for water hammer in the condensate downpipe of an air-cooled island as described in any one of claims 1 to 8, characterized in that, Includes the following steps: Select pipes of the same material and specifications as the original pipes or pipes that have been transitioned by reducing ends as the outer cylinder (1), and perform beveling; Make a solid cone (2) and drill guide holes at a preset angle at a designated position; Make a cross-shaped support plate (4) and a stop block (3); The support plate (4) is fully welded to the inner wall of the outer cylinder (1), and the weld height is not less than 6mm; The solid cone (2) is welded to the support plate (4), and the stop block (3) is welded between the inner wall of the outer cylinder (1) and the support plate (4). All welds must be fully welded, and the weld height is 6mm. The device is hoisted to the predetermined position of the condensate downcomer pipe, and the direction is adjusted so that the top of the solid cone (2) faces the direction of water flow, and then butt welding or flange connection is performed.

10. The preparation method according to claim 9, characterized in that, The machining accuracy of the top included angle of the solid cone (2) is controlled at 53.13∘±0.5∘, and the machining accuracy of the tilt angle of the guide hole is controlled at 10∘±0.5∘.

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