Device for preventing water hammer vibration of water feeding pipeline of low-pressure steam drum of waste heat boiler

Abstract

The utility model relates to the technical field of water attack eliminating devices, in particular to a device for preventing water attack vibration of a water feeding pipeline of a low-pressure steam drum of a waste heat boiler, which comprises a water feeding regulating valve, the front end of the water feeding regulating valve is communicated with an outlet of a coal economizer through a pipeline, and the rear end of the water feeding regulating valve is communicated with a deaerator through a water feeding pipeline. The deaerator is located above the low-pressure steam pocket and communicated with the low-pressure steam pocket, a check valve is installed on the water feeding pipeline and arranged on the portion, at the rear end of the water feeding adjusting valve, of the water feeding pipeline, a porous vibration reduction disc is installed in the portion, between the check valve and the deaerator, of the water feeding pipeline, the porous vibration reduction disc is of a disc-shaped structure, and the porous vibration reduction disc and the water feeding pipeline are coaxially arranged. A plurality of water passing holes penetrating through the porous vibration reduction disc in the axial direction are formed in the porous vibration reduction disc. Through the combination of the check valve and the porous damping disc, steam is prevented from reversely flowing into a water feeding pipeline, the resistance of water flow is increased, the water flow speed is reduced, pipeline vibration is reduced, and the stability and safety of a pipeline system are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water hammer elimination devices, in particular to a device for preventing water hammer vibration of a water supply pipe of a low-pressure drum of a waste heat boiler. Background Art

[0002] The steam drum is a cylindrical pressure vessel used in water-tube boilers for steam-water separation and steam purification, forming a water circulation loop and storing boiler water. Its primary function is to receive water from the economizer, separate steam from water, supply water to the circulation loop, and deliver saturated steam to the superheater. The drum holds a certain amount of water, providing a reservoir of heat and working fluid. This slows down steam pressure fluctuations during operating conditions and acts as a buffer when feedwater and load are temporarily out of sync. The drum is equipped with internal devices for steam-water separation, steam cleaning, in-boiler chemical dosing, and continuous blowdown, ensuring steam quality.

[0003] Currently, a common layout for the low-pressure drum water supply in waste heat boiler (HRSG) systems is to place the low-pressure water supply regulating valve directly on the drum platform, while the low-pressure drum is suspended above this platform. This layout effectively performs water supply and water level control functions in areas with stable power grids, ensuring stable boiler operation. However, the situation becomes more complex and variable in regions with relatively weak and unstable power grid infrastructure. In areas with unstable power grids, the fragility of power supply often leads to grid collapse or large-scale power outages, posing a severe challenge to industrial facilities that rely on stable power supply. For HRSG systems, a critical emergency response measure in the event of a plant-wide power outage is to quickly close the low-pressure drum water supply regulating valve to curb the further rise in the drum water level and prevent potential safety issues caused by excessive water levels. However, while this operation effectively controls the water level, it also introduces new challenges.

[0004] When the low-pressure drum feed regulating valve is closed, due to the high temperature and high pressure inside the drum, steam will flow upstream along the pipeline, gradually filling the pipe originally used for water supply. As the steam takes over, the temperature and pressure conditions in the pipeline change significantly, creating hidden dangers for subsequent restarts. Once the power system is restored and the low-pressure drum feed regulating valve is reopened to resume water supply, the problem becomes apparent. At this point, the cooler water suddenly encounters the previously accumulated high-temperature steam. The huge temperature and pressure differences between the two lead to a violent interaction between the water and steam, a phenomenon known as "water hammer." This phenomenon not only causes a sudden surge in pressure inside the pipeline, but also causes strong vibration in the pipeline. In severe cases, it may even damage the pipeline structure, affecting the safe and stable operation of the entire waste heat boiler system. Utility Model Content

[0005] In order to solve the technical problem that when the power system is restored and the low-pressure drum water supply regulating valve is reopened for water supply, water hammer will occur when water encounters the high-temperature steam behind the water supply regulating valve, causing severe vibration of the pipeline, the utility model provides a device to prevent water hammer vibration of the low-pressure drum water supply pipeline of the waste heat boiler.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for preventing water hammer vibration in the water supply pipe of a low-pressure steam drum of a waste heat boiler comprises a water supply regulating valve, the front end of the water supply regulating valve is connected to the economizer outlet through a pipe, the rear end is connected to the deaerator through a water supply pipe, the deaerator is located above the low-pressure steam drum and is connected to the low-pressure steam drum, a check valve is installed on the water supply pipe, the check valve is arranged on the water supply pipe at the rear end of the water supply regulating valve, a porous vibration damping disk is installed in the water supply pipe between the check valve and the deaerator, the porous vibration damping disk is a disc-shaped structure, the porous vibration damping disk is coaxially arranged with the water supply pipe, and a plurality of water holes are opened on the porous vibration damping disk and pass through the porous vibration damping disk in the axial direction.

[0008] In this structural solution, a check valve is placed on the deaerator inlet pipe. By blocking the reverse flow of steam into the water supply pipe, it ensures that when the water supply regulating valve is reopened, the water will not immediately encounter steam, thus reducing the impact of water hammer on the pipe. A porous vibration damping disc is placed on the pipe after the check valve at the deaerator inlet, close to the low-pressure steam drum. Through the water holes, it increases water flow resistance, slows water flow, and reduces pipe vibration caused by water hammer. This effectively reduces vibration in the water supply pipe without significantly affecting water flow efficiency, ensuring the safe and stable operation of the piping system and the waste heat boiler system under various operating conditions.

[0009] As a preferred implementation of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, the check valve is a swing check valve.

[0010] With the above structural solution, the swing check valve has the characteristics of low flow resistance, easy installation, high temperature resistance and corrosion resistance. It is suitable for high flow application environments and can ensure the stability and safety of system operation.

[0011] As an optimal implementation method of a device for preventing water hammer vibration of the water supply pipe of the waste heat boiler low-pressure drum, a vibration damping device is installed on the outside of the water supply pipe between the check valve and the water supply regulating valve, and the vibration damping device is arranged close to the check valve.

[0012] With this structural solution, the vibration damping device reduces the vibration transmission and amplitude of the water supply pipeline when subjected to external vibration or impact, thereby protecting the piping system and connectors from damage and excessive wear. The vibration damping device effectively absorbs and dissipates impact forces and vibrations caused by fluid flow, water hammer, or other external factors, ensuring stable and safe operation of the water supply pipeline.

[0013] As an optimal implementation method of a device for preventing water hammer vibration of the water supply pipe of the low-pressure steam drum of a waste heat boiler, the vibration reduction device is a spring bracket, which is elastic. One side of the spring bracket is connected to the outer wall of the water supply pipe, and the other side is connected to the external structure.

[0014] As a preferred implementation of a device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of the waste heat boiler, the vibration reduction device is a shock-absorbing pad, which is coated on the outer peripheral surface of the water supply pipe.

[0015] As a preferred implementation of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, the water holes on the porous vibration damping disk are evenly spaced.

[0016] As a preferred implementation of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, the water holes on the porous vibration damping disk are arranged in a rectangular array.

[0017] As a preferred implementation of a device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler, the inner diameter of the water supply pipe is 150 mm, the diameter of the water holes is 5 mm, and the number of the water holes is 450.

[0018] By adopting the above structural solution, the number and diameter of the water holes are reasonably arranged to ensure that the water flow efficiency is not significantly affected.

[0019] As a preferred implementation of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, the porous vibration damping disk is installed at a position 45 cm to 55 cm away from the outlet of the check valve.

[0020] With the above structural solution, the porous vibration damping disc is installed about 50 cm away from the check valve outlet, ensuring that the water flow has sufficient flow space after passing through the check valve, and the vibration reduction effect is optimal.

[0021] As a preferred implementation of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, the porous vibration damping disk is made of alloy steel.

[0022] With the above structural solution, the porous vibration damping disc is made of high-temperature-resistant and corrosion-resistant alloy steel to adapt to high-temperature and high-pressure working environments.

[0023] The beneficial effects of the utility model include:

[0024] The check valve, located on the deaerator inlet pipe, blocks the reverse flow of steam into the water supply pipe, ensuring that when the water supply regulating valve is reopened, the water does not immediately encounter steam, thus reducing the impact of water hammer on the pipe. The porous vibration damping plate, located on the pipe after the check valve at the deaerator inlet, close to the low-pressure steam drum, increases water flow resistance through the water holes, slowing the water flow and reducing pipe vibration caused by water hammer. This effectively reduces vibration in the water supply pipe without significantly affecting water flow efficiency, ensuring safe and stable operation of the piping system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a structural schematic diagram of a device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum according to a specific embodiment of the utility model;

[0027] Figure 2 It is a schematic diagram of the side structure of the porous vibration damping disk in a specific embodiment of the present utility model.

[0028] List of parts and reference numerals:

[0029] 1. Water supply regulating valve; 2. Deaerator; 3. Water supply pipe; 4. Check valve; 5. Multi-porous vibration damping plate; 6. Water hole; 7. Vibration damping device. DETAILED DESCRIPTION

[0030] In order to make the purpose, features, and advantages of the present invention more obvious and easy to understand, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the specific embodiments. Obviously, the embodiments described below are only some embodiments of the present invention, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0031] Reference Figure 1-2The present embodiment provides a device for preventing water hammer vibration of a water supply pipe of a low-pressure steam drum of a waste heat boiler, comprising a water supply regulating valve 1, wherein the front end of the water supply regulating valve 1 is connected to the outlet of the economizer through a pipe, and the rear end is connected to the deaerator 2 through a water supply pipe 3. The deaerator 2 is located above the low-pressure steam drum and is connected to the low-pressure steam drum. A check valve 4 is installed on the water supply pipe 3. The check valve 4 is a swing check valve 4. The check valve 4 is arranged on the water supply pipe 3 at the rear end of the water supply regulating valve 1. A porous vibration damping disk 5 is installed in the water supply pipe 3 between the check valve 4 and the deaerator 2. The installation position of the porous vibration damping disk 5 is 45 cm to 55 cm from the outlet of the check valve 4, preferably 50 cm. The material of the porous vibration damping disk 5 is a high-temperature resistant and corrosion-resistant alloy steel. The porous vibration damping disk 5 is a disc-shaped structure. The porous vibration damping disk 5 is coaxially arranged with the water supply pipe 3. The porous vibration damping disk 5 is provided with a plurality of water holes 6 that penetrate the porous vibration damping disk 5 in the axial direction. The water holes 6 on the porous vibration damping plate 5 are arranged in a rectangular array and are evenly spaced. The inner diameter of the water supply pipe 3 is 150 mm, the diameter of the water holes 6 is 5 mm, and the number of the water holes 6 is 450.

[0032] A vibration damping device 7 is installed on the exterior of the water supply pipe 3 between the check valve 4 and the water supply regulating valve 1. The vibration damping device 7 is located near the check valve 4. The vibration damping device 7 is a spring bracket. The spring bracket is elastic. One side of the spring bracket is connected to the outer wall of the water supply pipe 3, and the other side is connected to an external structure. The external structure can be a fixed structure such as a wall or a base next to the water supply pipe 3. The spring bracket can reduce the impact between the water supply pipe 3 and the external structure.

[0033] The working principle of this embodiment is:

[0034] Check valve 4, located on the inlet pipe of deaerator 2, blocks steam from flowing back into the water supply pipe 3. This prevents water from immediately encountering steam when the water supply regulating valve 1 reopens, minimizing the impact of water hammer on the pipes. This effectively prevents the spread of water hammer within the piping system and avoids damage to pipes and equipment caused by sudden water hammer.

[0035] The porous vibration damping disc 5 is located in the pipeline after the check valve 4 at the inlet of the deaerator 2, near the low-pressure steam drum. It increases water flow resistance through the water holes 6, slowing the water flow and reducing pipeline vibration caused by water hammer. This effectively reduces vibration in the water supply pipeline 3 without significantly affecting water flow efficiency. The porous vibration damping disc 5 acts as a buffer and disperses impact forces within the pipeline system, reducing the transmission and amplitude of vibration, thereby ensuring safe and stable operation of the pipeline system.

[0036] In other embodiments, the vibration reduction device 7 may also be a shock-absorbing pad, which is coated on the outer peripheral surface of the water supply pipe 3 . The material of the shock-absorbing pad may be rubber, sponge or foam.

[0037] Vibration damping devices 7, such as spring supports and vibration-damping pads, are installed at key locations on the water supply pipeline 3. Their primary function is to reduce the transmission and amplitude of vibrations in the pipeline system when subjected to external vibrations or impacts, thereby protecting the pipeline system and connectors from damage and excessive wear. Vibration damping devices 7 effectively absorb and disperse impact forces and vibrations caused by fluid flow, water hammer, or other external factors, ensuring stable and safe operation of the pipeline during operation.

[0038] In this embodiment, the low-pressure drum pressure is 0.79 MPa, the low-pressure feed water flow rate is 145.2 t / h, and the low-pressure feed water pressure is 2.5 MPa.

[0039] In this embodiment, when the porous vibration damping disc 5 is installed in the pipeline, it is fixed by flange connection to facilitate maintenance and replacement.

[0040] In this embodiment, the water supply pipe 3 uses a DN150 pipe. For DN150 pipes, the most common swing check valve 4 is the H44H-150LB model. This type of check valve 4 features low flow resistance, easy installation, and suitability for high-flow applications. Its design features include: 1. Suitable for DN150 pipe systems; 2. Operating pressure of 2.5 MPa (absolute) and low-pressure drum pressure of 0.79 MPa (absolute); 3. Applicable flow rate of 145.2 tons / hour; 4. Carbon steel or stainless steel valve body for high-temperature and corrosion resistance; 5. Stainless steel disc for excellent high-temperature and wear resistance; 6. PTFE or metal seals for sealing, ensuring reliable sealing in high-temperature and high-pressure environments; 7. Applicable temperature range of 0°C to 200°C; 8. Flange connection for easy installation and maintenance; 9. Design, manufacturing, and pressure testing standards of GB / T12235 and GB / T13927, respectively.

[0041] In this embodiment, the design parameters of the porous vibration damping plate 5 are as follows: 1. High-strength stainless steel or alloy material with high-temperature and corrosion resistance; 2. Inner diameter of the water supply pipe 3: DN150 (150 mm); 3. Low-pressure drum pressure: 0.79 MPa (absolute); 4. Low-pressure feedwater flow rate: 145.2 tons / hour; 5. Low-pressure feedwater pressure: 2.5 MPa (absolute); 6. Diameter of the water holes 6: 5 mm; 7. Number of water holes 6: 450. Based on the above parameters, whether calculated based on the Darcy-Weisbach equation or the kinetic energy difference, the number and diameter of the water holes 6 on the porous vibration damping plate 5 do not significantly affect water flow efficiency and will not affect the entire water supply pipe 3.

[0042] exist Figure 1 In the figure, the check valve 4, the porous vibration damping disc 5 and the vibration damping device 7 are represented by simplified symbols to represent the structural positions. Figure 1The check valve 4, porous vibration damping disk 5 and vibration damping device 7 referred to therein do not represent the actual structure. Those skilled in the art should understand that the check valve 4 is a structure in the prior art, and the structures of the porous vibration damping disk 5 and the vibration damping device 7 have been described above and will not be repeated here.

[0043] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for preventing water hammer vibration of a water supply pipe of a waste heat boiler low-pressure drum, comprising a water supply regulating valve (1), wherein the front end of the water supply regulating valve (1) is connected to the outlet of an economizer through a pipe, and the rear end is connected to a deaerator (2) through a water supply pipe (3), and the deaerator (2) is located above the low-pressure drum and is connected to the low-pressure drum, characterized in that: A check valve (4) is installed on the water supply pipe (3). The check valve (4) is arranged on the water supply pipe (3) at the rear end of the water supply regulating valve (1). A porous vibration damping disc (5) is installed in the water supply pipe (3) between the check valve (4) and the deaerator (2). The porous vibration damping disc (5) is a disc-shaped structure. The porous vibration damping disc (5) and the water supply pipe (3) are coaxially arranged. The porous vibration damping disc (5) is provided with a plurality of water holes (6) that penetrate the porous vibration damping disc (5) in the axial direction.

2. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of the waste heat boiler according to claim 1 is characterized in that: The check valve (4) is a swing check valve (4).

3. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 1 is characterized in that: A vibration damping device (7) is installed outside the water supply pipe (3) between the check valve (4) and the water supply regulating valve (1), and the vibration damping device (7) is arranged close to the check valve (4).

4. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 3 is characterized in that: The vibration reduction device (7) is a spring bracket, which is elastic. One side of the spring bracket is connected to the outer wall of the water supply pipe (3), and the other side is connected to the external structure.

5. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of the waste heat boiler according to claim 3 is characterized in that: The vibration reduction device (7) is a shock-absorbing pad, which is coated on the outer peripheral surface of the water supply pipe (3).

6. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 1, characterized in that: The water holes (6) on the porous vibration damping disc (5) are evenly spaced.

7. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 6, characterized in that: The water holes (6) on the porous vibration damping disc (5) are arranged in a rectangular array.

8. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 6, characterized in that: The inner diameter of the water supply pipe (3) is 150 mm, the diameter of the water holes (6) is 5 mm, and the number of the water holes (6) is 450.

9. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 1, characterized in that: The installation position of the porous vibration damping disc (5) is 45 cm to 55 cm away from the outlet of the check valve (4).

10. The device for preventing water hammer vibration of the water supply pipe of the low-pressure drum of a waste heat boiler according to claim 1, characterized in that: The porous vibration damping disc (5) is made of alloy steel.

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