Novel feed water pump circulating pipe structure for deaerator
The multi-stage energy dissipation design of the double-layer sleeve structure solves the problems of water flow impact and vibration in large units of traditional single-hole pipe structures, and realizes stable operation and improved safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HARBIN BOILER CO LTD
- Filing Date
- 2025-07-24
- Publication Date
- 2026-07-24
AI Technical Summary
Traditional single-hole tube deaerators in large units suffer from excessive impact, pipe vibration, and noise due to increased circulating water volume, especially under high load conditions. Furthermore, they are more difficult to manufacture and process, and pose risks of welding defects and stress concentration.
It adopts a double-layer casing structure, including a perforated pipe and an energy dissipation device cylinder. Through multi-stage energy dissipation design, combined with the support structure of the upper cover plate and the lower support plate, a rigid support system is formed to achieve stepped energy dissipation and stable transport of water flow.
It effectively reduces the impact of water flow on the internal components of the deaerator, reduces equipment vibration and noise, improves operational safety and reliability, avoids manufacturing and processing difficulties and welding defects, and adapts to water volume fluctuations.
Smart Images
Figure CN224551524U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of deaerator technology, and in particular relates to a novel feedwater pump circulation pipe structure for deaerators. Background Technology
[0002] In power plant systems, deaerators are critical equipment for ensuring boiler feedwater quality. Their main function is to remove dissolved oxygen from the water and prevent corrosion of the thermal system. The feedwater pump circulation pipe, as an important component of the deaerator, is responsible for introducing circulating water into the deaerator, thereby maintaining stable system operation.
[0003] In existing technologies, circulating pipes mostly adopt a single porous pipe structure, which is directly welded to the lower part of the deaerator shell. This structure is still applicable in small and medium-sized units, but with the development of larger generator sets, especially when the unit power exceeds 300MW, output fluctuations and changes in load conditions are frequent, leading to a significant increase in the circulating water volume of the feedwater pump. When the unit output increases, the circulating water volume increases accordingly. To accommodate the higher flow rate, traditional methods require increasing the diameter of the circulating pipe. This necessitates creating larger openings in the deaerator shell for welding the circulating pipe. The increased opening size significantly increases the reinforcement area of the deaerator shell, greatly increasing the manufacturing and processing difficulty. This not only prolongs the production cycle but also easily introduces welding defects and stress concentration risks. At the same time, the surge in circulating water volume exacerbates the impact of water flow on the diameter of internal components of the deaerator, causing problems such as severe pipe vibration and excessive noise. In severe cases, it may lead to equipment fatigue damage, decreased operational reliability, and increased maintenance costs. The existing single-hole pipe structure lacks an effective energy dissipation mechanism and cannot adaptively buffer water flow energy when water volume fluctuates. Its limitations are particularly prominent under high load conditions, which restricts the efficiency and safety of large units. Utility Model Content
[0004] In view of this, the present invention aims to propose a new type of feedwater pump circulation pipe structure for deaerators, in order to solve the problems of excessive impact on internal components of deaerators, pipe vibration and noise caused by the increase in circulating water volume when the unit output increases, due to the traditional single-pipe structure of the deaerator circulation pipe.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a novel feedwater pump circulation pipe structure for a deaerator, comprising a double-layer sleeve, an upper cover plate, and a lower support plate. The double-layer sleeve includes a porous pipe and an energy dissipation device cylinder. The energy dissipation device cylinder is coaxially sleeved outside the porous pipe. Through holes are opened in the pipe walls of both the porous pipe and the energy dissipation device cylinder. The top ends of both the porous pipe and the energy dissipation device cylinder are connected to the upper cover plate. The bottom end of the energy dissipation device cylinder is connected to the lower support plate. A circular hole is opened in the center of the lower support plate. An extension pipe is provided at the bottom of the porous pipe. The extension pipe passes through the lower support plate, passes through the deaerator cylinder, and extends outward.
[0006] Furthermore, the diameter of the through holes on the porous tube and the energy dissipation device cylinder is 20mm.
[0007] Furthermore, the upper cover plate has a disc structure, and the diameter of the upper cover plate is larger than the diameter of the energy dissipation device cylinder.
[0008] Furthermore, the lower support plate has a circular structure, with its inner diameter equal to the diameter of the porous tube and its outer diameter equal to the diameter of the upper cover plate.
[0009] Furthermore, a plurality of connecting plates are provided between the upper cover plate and the lower support plate, and the plurality of connecting plates are evenly distributed along the circumferential direction.
[0010] Furthermore, the porous tube passes through the lower support plate and is connected to the deaerator cylinder via a porous tube support plate assembly.
[0011] Furthermore, the porous tube support plate assembly includes multiple porous tube support plates evenly distributed along the circumference. One end of each porous tube support plate is connected to the side wall of the bottom extension tube of the porous tube, and the other end is connected to the inner wall of the deaerator cylinder.
[0012] Furthermore, the bottom of the lower support plate is connected to the deaerator cylinder via a lower support plate support assembly.
[0013] Furthermore, the lower support plate assembly includes multiple lower support plates evenly distributed along the circumference, with one end of each lower support plate connected to the bottom surface of the lower support plate and the other end connected to the inner wall of the deaerator cylinder.
[0014] Furthermore, the area of the through holes on the porous tube is twice the cross-sectional area of the porous tube, and the area of the through holes on the cylinder of the energy dissipation device is twice the total area of the through holes on the porous tube.
[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model achieves stepped energy dissipation through a double-layer sleeve structure, avoiding direct impact of circulating water on the internal components of the deaerator. The double-layer sleeve design is adaptive to changes in unit output. Under variable load conditions, it can stably dissipate energy without structural adjustments, avoiding the performance failure problem of traditional single-pipe structures at high flow rates, and significantly improving the operational safety of large units. 2. The perforated area of the porous tube in this utility model is twice the cross-sectional area, which allows the water flow to diffuse and slow down initially. The perforated area of the energy dissipation cylinder is further expanded to twice the perforated area of the porous tube, achieving secondary energy dissipation. The dual-stage speed reduction significantly reduces the impact force of the water flow, avoids the direct impact of circulating water on the internal components of the deaerator, and eliminates the hidden danger of pipeline vibration. After the water flow passes through the double-tube stepped energy dissipation, the flow velocity is greatly reduced. Combined with the blocking effect of the upper cover plate on the upward sprayed water flow, it avoids the cavitation noise generated by the high-speed water flow splashing, and significantly reduces the noise level of the equipment operation. 3. This utility model, through its double-layer sleeve structure, eliminates the need to enlarge the diameter of the circulation pipe when the circulating water volume increases, thus avoiding the problem of increased cylinder opening size caused by increased circulation pipe diameter. It also solves the risks of manufacturing difficulties, welding defects, and stress concentration caused by increased cylinder reinforcement area. 4. This utility model uses a connecting plate to weld the upper cover plate and the lower support plate into an integral frame. Combined with the lower support plate support plate assembly for bidirectional fixation of the support plate and the multi-hole pipe support plate assembly for bidirectional reinforcement of the multi-hole pipe, a rigid support system is formed, which effectively resists structural vibration caused by water flow fluctuations and improves the long-term operational reliability of the equipment. Attached Figure Description
[0016] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of the novel feedwater pump circulation pipe for a deaerator and the installation of the deaerator cylinder according to the present invention. Figure 2 This is a front view of the circulating pipe structure of a novel feedwater pump for a deaerator according to the present invention. Figure 3 This is a side view of the circulating pipe structure of a novel feedwater pump for a deaerator according to the present invention. Figure 4 This is a front structural diagram of the energy dissipation device cylinder of a novel feedwater pump circulation pipe structure for a deaerator according to the present invention. Figure 5 This is a cross-sectional structural diagram of the energy dissipation device cylinder of a novel feedwater pump circulation pipe structure for a deaerator according to the present invention. Figure 6 This is a front view of the porous pipe of the novel feedwater pump circulation pipe structure for a deaerator described in this utility model. Figure 7 This is a cross-sectional schematic diagram of a porous pipe with a novel feedwater pump circulation pipe structure for a deaerator according to the present invention. Figure 8This is a top view schematic diagram of the lower support plate of a novel feedwater pump circulation pipe structure for a deaerator according to the present invention.
[0017] In the picture: 1. Perforated pipe; 2. Upper cover plate; 3. Lower support plate; 4. Perforated pipe support plate; 5. Lower support plate support plate; 6. Energy dissipation device cylinder; 7. Connecting plate; 8. Deaerator cylinder. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present utility model can be combined with each other, and the described embodiments are only some embodiments of the present utility model, not all embodiments.
[0019] Detailed implementation method: See Figure 1-8 This embodiment describes a novel feedwater pump circulation pipe structure for a deaerator, comprising a double-layered sleeve, an upper cover plate 2, and a lower support plate 3. The double-layered sleeve includes a porous pipe 1 and an energy dissipation device cylinder 6, which is coaxially sleeved outside the porous pipe 1. Both the porous pipe 1 and the energy dissipation device cylinder 6 have through holes in their walls. The double-layered sleeve is used for multi-stage energy dissipation of the circulating water, preventing damage to components inside the deaerator from the impact of the circulating water. The porous pipe 1 is used to input the circulating water into the deaerator cylinder 8 and perform primary energy dissipation. The energy dissipation device cylinder 6 is used for secondary energy dissipation of the circulating water. The top ends of both the porous pipe 1 and the energy dissipation device cylinder 6 are connected to the upper cover plate 2. The upper cover plate 2 is welded to the lower surface of the upper cover plate 2. The upper cover plate 2 is used to prevent circulating water from spraying out from the top of the double-layer sleeve, thereby sealing the top of the double-layer sleeve. The bottom end of the energy dissipation device cylinder 6 is connected to the lower support plate 3. A circular hole is opened in the center of the lower support plate 3. The bottom of the porous pipe 1 is provided with an extension pipe. The extension pipe passes through the lower support plate 3 and then passes through the deaerator cylinder 8 and extends to the outside. The extension pipe and the porous pipe 1 are an integral structure. The surface of the extension pipe is not provided with through holes. The extension pipe is connected to the outlet of the feed water pump. The lower support plate 3 is used to provide the lower support and fixing point for supporting the energy dissipation device cylinder 6, and at the same time guides the porous pipe 1 to extend outward from the energy dissipation device cylinder 6. The circulating water must pass through the porous pipe 1 and the energy dissipation device cylinder 6 in sequence before entering the deaerator cylinder 8.
[0020] The working principle of this utility model is as follows: The high-pressure, high-speed circulating water from the water pump outlet first enters the porous pipe 1. Driven by pressure, the water is forced to spray out through the through-holes in the wall of the porous pipe 1. The flow of water through these through-holes converts pressure potential energy into kinetic energy, thus weakening the impact energy of the water flow and achieving primary energy dissipation. The concentrated large stream of water is initially dispersed into multiple relatively smaller, high-speed jets, which enter the annular cavity formed by the energy dissipation device cylinder 6 fitted around the porous pipe 1. Within the annular cavity, the jets collide with each other, and friction occurs between the water flow and the energy dissipation device cylinder 6. These flow phenomena lead to… The kinetic energy of the water flow is further consumed in large quantities, and the water flow velocity is significantly reduced. Subsequently, this water flow undergoes secondary energy dissipation through the through holes on the wall of the energy dissipation device cylinder 6. After two stages of energy dissipation, the water flow enters the deaerator cylinder 8 in a low-speed, low-pressure, and uniformly dispersed state. The lower support plate 3 seals the bottom of the annular chamber, ensuring that the water flow must flow out through the holes on the side wall of the energy dissipation device cylinder 6, preventing the water flow from directly spraying downwards and impacting the deaerator cylinder 8. The upper cover plate 2 prevents circulating water from spraying out from the top of the double-layer sleeve, thereby avoiding impact on the deaerator cylinder 8 and the internal components of the deaerator.
[0021] The diameter of the through holes on the porous pipe 1 and the energy dissipation device cylinder 6 is 20mm. The 20mm through holes can ensure that the new type of feedwater pump circulation pipe structure for the deaerator achieves the expected technical effects of high-efficiency energy dissipation, uniform water distribution, equipment protection, and stable operation.
[0022] The upper cover plate 2 has a disc structure, and its diameter is larger than that of the energy dissipation device cylinder 6. The diameter of the upper cover plate 2 is 500mm larger than that of the energy dissipation device cylinder 6, which can effectively prevent water from being sprayed from the through holes on the side wall of the energy dissipation device cylinder 6 onto the upper part of the deaerator cylinder 8, and ensure the sealing of the top of the double-layer sleeve.
[0023] The lower support plate 3 has a circular structure. The inner diameter of the lower support plate 3 is equal to the diameter of the porous pipe 1, and the outer diameter is equal to the diameter of the upper cover plate 2. The lower support plate 3 reliably fixes and seals the bottom of the energy dissipation device cylinder 6, preventing circulating water from directly entering the deaerator cylinder 8.
[0024] Multiple connecting plates 7 are provided between the upper cover plate 2 and the lower support plate 3. The multiple connecting plates 7 are evenly distributed along the circumference. The two ends of the connecting plates 7 are usually connected to the upper cover plate 2 and the lower support plate 3 by welding. The connecting plates 7 connect the upper cover plate 2 and the lower support plate 3 into a whole, which improves the overall structural rigidity and stability and prevents the device from deforming and becoming unstable. The connecting plates 7 are spaced apart from the energy dissipation device cylinder 6 to prevent the connecting plates 7 from affecting the drainage efficiency of the energy dissipation device cylinder 6.
[0025] After passing through the lower support plate 3, the porous tube 1 is connected to the deaerator cylinder 8 through the porous tube support plate assembly. The porous tube support plate assembly is used to provide stable support for the porous tube 1 and enhance the stability of the porous tube 1.
[0026] The porous tube support plate assembly includes multiple porous tube support plates 4 evenly distributed along the circumference. One end of each porous tube support plate 4 is connected to the side wall of the bottom extension tube of the porous tube 1, and the other end is connected to the inner wall of the deaerator cylinder 8. In this embodiment, there are four porous support plates 4, which are evenly distributed along the circumference to provide stable support for the porous tube 1.
[0027] The bottom of the lower support plate 3 is connected to the deaerator cylinder 8 through the lower support plate support plate assembly. The lower support plate support plate assembly is used to provide stable support for the lower support plate 3, the energy dissipation device cylinder 6 on the lower support plate 3, and the upper cover plate 2, thereby enhancing the stability of the lower support plate 3.
[0028] The lower support plate assembly includes multiple lower support plate 5s evenly distributed along the circumference. One end of each lower support plate 5 is connected to the bottom surface of the lower support plate 3, and the other end is connected to the inner wall of the deaerator cylinder 8. In this embodiment, there are four lower support plates 5, which are evenly distributed along the circumference to provide stable support for the lower support plate 3.
[0029] The area of the through holes on the porous pipe 1 is twice the cross-sectional area of the porous pipe 1. While ensuring a significant flow-saving and energy-dissipating effect, it avoids excessive water flow resistance. The area of the through holes on the energy dissipation device cylinder 6 is twice the total area of the through holes on the porous pipe 1. This ensures that the water flow after sufficient collision and energy dissipation can be discharged smoothly, at low pressure, and evenly.
[0030] The specific embodiments of this utility model disclosed above are merely illustrative of the present utility model. These specific embodiments do not exhaustively describe all details, nor do they limit the utility model to only the described embodiments. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it.
Claims
1. A novel feedwater pump circulation pipe structure for a deaerator, characterized in that: It includes a double-layer sleeve, an upper cover plate (2) and a lower support plate (3). The double-layer sleeve includes a porous tube (1) and an energy dissipation device cylinder (6). The energy dissipation device cylinder (6) is coaxially sleeved on the outside of the porous tube (1). The walls of the porous tube (1) and the energy dissipation device cylinder (6) are both opened with through holes. The top ends of the porous tube (1) and the energy dissipation device cylinder (6) are connected to the upper cover plate (2). The bottom end of the energy dissipation device cylinder (6) is connected to the lower support plate (3). The lower support plate (3) has a circular hole in its center. The bottom of the porous tube (1) is provided with an extension tube. The extension tube passes through the lower support plate (3), passes through the deaerator cylinder (8), and extends outward.
2. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The diameter of the through holes on the porous pipe (1) and the energy dissipation device cylinder (6) is 20 mm.
3. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The upper cover plate (2) is a disc structure, and the diameter of the upper cover plate (2) is larger than the diameter of the energy dissipation device cylinder (6).
4. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The lower support plate (3) is a ring structure. The inner diameter of the lower support plate (3) is equal to the diameter of the porous tube (1), and the outer diameter is equal to the diameter of the upper cover plate (2).
5. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: Multiple connecting plates (7) are provided between the upper cover plate (2) and the lower support plate (3), and the multiple connecting plates (7) are evenly distributed along the circumferential direction.
6. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The porous tube (1) passes through the lower support plate (3) and is connected to the deaerator cylinder (8) through the porous tube support plate assembly.
7. The novel feedwater pump circulation pipe structure for a deaerator according to claim 6, characterized in that: The porous tube support plate assembly includes multiple porous tube support plates (4) evenly distributed along the circumference. One end of the porous tube support plate (4) is connected to the side wall of the bottom extension tube of the porous tube (1), and the other end is connected to the inner wall of the deaerator cylinder (8).
8. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The bottom of the lower support plate (3) is connected to the deaerator cylinder (8) through the lower support plate support plate assembly.
9. A novel feedwater pump circulation pipe structure for a deaerator according to claim 8, characterized in that: The lower support plate assembly includes multiple lower support plates (5) evenly distributed along the circumference. One end of the lower support plate (5) is connected to the bottom surface of the lower support plate (3), and the other end is connected to the inner wall of the deaerator cylinder (8).
10. The novel feedwater pump circulation pipe structure for a deaerator according to claim 1, characterized in that: The area of the through hole on the porous tube (1) is twice the cross-sectional area of the porous tube (1), and the area of the through hole on the energy dissipation device cylinder (6) is twice the total area of the through holes on the porous tube (1).