Drain recovery structure for high-pressure heater
By designing a hydrophobic recovery structure, the hydrophobic water from the superheated section of the high-pressure heater is introduced into a hydrophobic tank, realizing the recovery and utilization of heat and working fluid. This solves the problems of hydrophobic waste and equipment damage, and improves the efficiency and safety of hydrophobic discharge.
Patent Information
- Application Number
- CN202421492550.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-26
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-06-26
AI Technical Summary
The waste caused by draining the superheated section of the high-pressure heater into the pressurized drain header is due to the high pressure and may also cause the header to vibrate and damage the equipment.
Design a hydrophobic recovery structure, including first, second and third hydrophobic pipes, and a hydrophobic tank. Hydrophobic water flows into the third hydrophobic pipe through the first and second hydrophobic pipes and finally into the hydrophobic tank, realizing the recovery and utilization of heat and working fluid, and avoiding direct discharge to the pressurized main pipe.
It solves the problem of water wastage, avoids equipment damage from main pipe vibration, improves water discharge efficiency and safety, and reduces the impact on equipment.
Smart Images
Figure CN223622890U_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of thermal power generation technology, and more specifically, to a hydrophobic recovery structure for a high-pressure heater. Background Technology
[0002] The power plant's steam turbine is designed with a regenerative steam extraction system. Steam is extracted from the high-pressure extraction section of the turbine to the high-pressure heater. The high-pressure heater consists of two main parts: the shell and the piping system. Inside the shell, the entire heat exchange section is divided into three sections: a superheated steam cooling section (superheat section), a condensation section, and a condensate cooling section (condensate condensate section). The condensate in the high-pressure heater refers to the condensate formed after the extracted steam releases heat inside the high-pressure heater.
[0003] In related technologies, the superheated section of a high-pressure heater is usually connected to a drain pipe. The drain water from the superheated section is discharged to the pressurized drain header through the drain pipe, resulting in waste of drain water. Utility Model Content
[0004] The purpose of this disclosure is to provide a condensate recovery structure for a high-pressure heater that solves the problem of waste caused by condensate from the superheated section being discharged into a pressurized condensate header.
[0005] To achieve the above objectives, this disclosure provides a condensate recovery structure for a high-pressure heater. The condensate recovery structure includes: a first condensate pipe, a second condensate pipe, a third condensate pipe, and a condensate tank. The inlet end of the first condensate pipe is connected to the superheated section of the high-pressure heater, the outlet end of the first condensate pipe is connected to the inlet end of the second condensate pipe, the outlet end of the second condensate pipe is connected to the third condensate pipe, the inlet end of the third condensate pipe is connected to the condenser, and the outlet end of the third condensate pipe is connected to the condensate tank.
[0006] Optionally, the outlet end of the second drain pipe extends into the third drain pipe and is spaced apart from the inner wall of the third drain pipe.
[0007] Optionally, the second drain pipe includes a first branch pipe and a second branch pipe. The inlet end of the second drain pipe is disposed in the first branch pipe, and the outlet end of the second drain pipe is disposed in the second branch pipe. The first branch pipe and the second branch pipe are connected through a first connecting port. The second branch pipe and the third drain pipe form an acute angle, and the first connecting port is disposed between the inlet end of the third drain pipe and the outlet end of the second drain pipe.
[0008] Optionally, the angle between the second branch pipe and the third drainage pipe is 25° to 65°.
[0009] Optionally, the angle between the second branch pipe and the third drainage pipe is 45°.
[0010] Optionally, the third drain pipe is provided with a second connecting port, and the second branch pipe extends into the third drain pipe through the second connecting port. The outlet end of the third drain pipe is connected to the bottom of the drain tank, and the distance between the second connecting port and the bottom of the drain tank is 5mm to 35mm.
[0011] Optionally, the second branch pipe is welded to the second connection port.
[0012] Optionally, a first switching valve is provided on the second drain pipe.
[0013] Optionally, the first drain pipe includes a fourth branch pipe, on which two second switching valves are provided, and a drain trap is provided between the two second switching valves.
[0014] Optionally, the first drain pipe includes a third branch pipe, which is connected in parallel with the fourth branch pipe, and the third branch pipe is equipped with the second switch valve.
[0015] Through the above technical solution, the condensate recovery structure disclosed herein allows the condensate from the superheated section to flow sequentially through the first condensate pipe into the second and third condensate pipes, and finally into the condensate tank. This achieves the recovery and utilization of heat and working fluid from the condensate in the superheated section, solving the problem of waste caused by discharging the condensate from the superheated section into the pressurized header. Simultaneously, it avoids the situation where discharging the condensate from the superheated section into the pressurized header causes vibration of the pressurized header, leading to equipment damage. Furthermore, since the second condensate pipe is connected to the third condensate pipe, rather than to the condensate tank, the step of creating a connection port on the condensate tank is eliminated.
[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description
[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:
[0018] Figure 1 This is a schematic diagram of the hydrophobic recovery structure for a high-pressure heater provided in an embodiment of this disclosure.
[0019] Explanation of reference numerals in the attached figures
[0020] 1-First drain pipe, 11-Third branch pipe, 12-Fourth branch pipe, 2-Second drain pipe, 21-First branch pipe, 22-Second branch pipe, 23-First connecting port, 3-Third drain pipe, 31-Second connecting port, 4-Drain tank, 5-First switch valve, 6-Second switch valve, 7-Drain steam trap, 10-Superheated section, 20-Pressurized main pipe. Detailed Implementation
[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.
[0022] In this disclosure, unless otherwise stated, the directional terms "inner" and "outer" refer to "inner" and "outer" relative to the contour of the corresponding component itself. Furthermore, the use of terms such as "first" and "second" is intended to distinguish different components and does not imply sequentiality or importance. Additionally, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same elements. Those skilled in the art should understand that the above definitions are for explanation and illustration only and should not be construed as limiting the scope of this disclosure.
[0023] According to a specific embodiment of this disclosure, refer to Figure 1 As shown, a condensate recovery structure for a high-pressure heater is provided. The condensate recovery structure includes a first condensate pipe 1, a second condensate pipe 2, a third condensate pipe 3, and a condensate tank 4. The inlet end of the first condensate pipe 1 is connected to the superheated section 10 of the high-pressure heater. The outlet end of the first condensate pipe 1 is connected to the inlet end of the second condensate pipe 2. The outlet end of the second condensate pipe 2 is connected to the third condensate pipe 3. The inlet end of the third condensate pipe 3 is connected to the condenser. The outlet end of the third condensate pipe 3 is connected to the condensate tank 4.
[0024] Through the above technical solution, the condensate recovery structure disclosed herein allows the condensate from the superheated section 10 to flow sequentially through the first condensate pipe 1 into the second condensate pipe 2 and the third condensate pipe 3, and finally into the condensate tank 4. This achieves the recovery and utilization of heat and working fluid from the condensate in the superheated section, solving the problem of waste caused by discharging the condensate from the superheated section into the pressurized header 20. Simultaneously, it avoids the situation where discharging the condensate from the superheated section into the pressurized header 20 causes vibration of the pressurized header 20, leading to equipment damage. Furthermore, since the second condensate pipe 2 is connected to the third condensate pipe 3, rather than to the condensate tank 4, the step of creating a connection port on the condensate tank 4 is eliminated. The second condensate pipe 2 can be configured as a negative pressure pipe, thus eliminating the need for a pipe fitting. The condensate in the second condensate pipe 2 can be led to the condensate tank 4 under negative pressure via the third condensate pipe 3. Additionally, the third condensate pipe 3 can serve as an emergency condensate pipe, and the condensate tank 4 can also be connected to a low-pressure heater. Here, the inlet end of the third drain pipe 3 is connected to the condenser to allow water to flow to the condenser when the emergency drain is opened.
[0025] In addition, since some of the condensate from the low-pressure heater is introduced into the condensate tank 4 and periodically sent to the water supply system, while the normal condensate drainage of the high-pressure heater condensate system adopts a stage-by-stage gravity flow method, that is, the condensate from the previous stage heater is discharged into the next stage heater through the pressure difference between stages. Therefore, the condensate from the superheated section of the high-pressure heater can be recycled by introducing it into the condensate tank 4 of the low-pressure heater.
[0026] The condensate tank 4 is also connected to a condensate pump, so that the condensate in the condensate tank 4 can be pumped into the condensate system through the condensate pump. And because the amount of heat recovered is small, cavitation at the inlet of the condensate pump will not be caused.
[0027] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the outlet end of the second drain pipe 2 extends into the third drain pipe 3, and is spaced apart from the inner wall of the third drain pipe 3. In this way, the second drain pipe 2 and the third drain pipe 3 can be connected directly by opening an opening in the wall of the third drain pipe 3, without the need to redesign the pipe fitting or create an opening in the drain tank 4. Because the outlet end of the second drain pipe 2 is spaced apart from the inner wall of the third drain pipe 3, there is a buffer gap between the condensate from the superheated section flowing out of the outlet end of the second drain pipe 2 and the inner wall of the third drain pipe 3, reducing the impact force of the condensate from the superheated section on the inner wall of the third drain pipe 3.
[0028] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the second drain pipe 2 includes a first branch pipe 21 and a second branch pipe 22. The inlet end of the second drain pipe 2 is located at the first branch pipe 21, and the outlet end of the second drain pipe 2 is located at the second branch pipe 22. The first branch pipe 21 and the second branch pipe 22 are connected by a first connecting port 23. The angle between the second branch pipe 22 and the third drain pipe 3 is an acute angle, and the first connecting port 23 is located between the inlet end of the third drain pipe 3 and the outlet end of the second drain pipe 2. In this way, the outlet of the second drain pipe 2 can be oriented towards the drain tank 4, so that the superheated section drain from the first branch pipe 21 to the second branch pipe 22 can flow in the direction of the drain tank 4, so as to guide the superheated section drain to the drain tank 4 and avoid the drain flowing from the second drain pipe 2 into the third drain pipe 3 flowing back towards the drain tank 4, causing violent vibration of the second drain pipe 2 and the third drain pipe 3, thus ensuring the discharge efficiency of the superheated section drain. The angle between the second branch pipe 22 and the third drain pipe 3 is an acute angle, which provides a buffer when the superheated section drain flows to the inner wall of the third drain pipe 3, reducing the impact force on the inner wall of the third drain pipe 3.
[0029] In some embodiments of this disclosure, reference is made to Figure 1As shown, the angle between the second branch pipe 22 and the third drain pipe 3 can be 25° to 65°. This avoids excessive impact on the inner wall of the third drain pipe 3 due to an excessively small angle between the second branch pipe 22 and the third drain pipe 3, which could damage the third drain pipe 3. Furthermore, it ensures that when the superheated section drain flows to the drain tank 4, the pipe slope created by the angle allows for a larger flow rate, thus guaranteeing the efficient transport of the superheated section drain.
[0030] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the angle between the second branch pipe 22 and the third drain pipe 3 can be 30°, 45° or 60°. For example, the angle between the second branch pipe 22 and the third drain pipe 3 can be 30°. This disclosure does not limit this.
[0031] In some embodiments of this disclosure, reference is made to Figure 1 As shown, a second connecting port 31 is provided on the third drain pipe 3. The second branch pipe 22 extends into the third drain pipe 3 through the second connecting port 31. The outlet end of the third drain pipe 3 is connected to the bottom of the drain tank 4. The distance between the second connecting port 31 and the bottom of the drain tank 4 can be 5mm to 35mm. In this way, there is operating space between the second connecting port 31 and the drain tank 4, so that the second connecting port 31 can be opened on the third water supply pipe. At the same time, when the superheated section drain flows from the second branch pipe 22 to the third drain pipe 3, it can be ensured that the superheated section drain enters the drain tank 4 under the action of negative pressure. This avoids the superheated section drain having a long flow distance in the third drain pipe 3, where the negative pressure is insufficient to lead the superheated section drain to the drain tank 4, thus affecting the conveying efficiency of the superheated section drain. The distance between the second connecting port 31 and the bottom of the drainage tank 4 can be 10mm, 20mm or 30mm. For example, the distance between the second connecting port 31 and the bottom of the drainage tank 4 can be set to 20mm. This disclosure does not limit this.
[0032] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the second branch pipe 22 can be welded to the second connecting port 31. This welding connection ensures the reliability of the connection between the second branch pipe 22 and the second connecting port 31, as well as the stability of the pipeline when the superheated section drain flows between the second branch pipe 22 and the third drain pipe 3. In other embodiments, the second branch pipe 22 and the second connecting port 31 can also be connected by a clamp, or other connection methods that can fix the second branch pipe 22 to the second connecting port 31; this disclosure does not impose specific limitations on this.
[0033] In some embodiments of this disclosure, reference is made to Figure 1As shown, a first switching valve 5 is installed on the second drain pipe 2. The first switching valve 5 is used to control the opening and closing of the second drain pipe 2. When the superheated section drain cannot be discharged through the second drain pipe 2, the second drain pipe 2 can be closed by the first switching valve 5, so that the superheated section drain can be discharged through the pressurized main pipe 20.
[0034] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the first drain pipe 1 includes a fourth branch pipe 12, on which two second switching valves 6 are installed, and a steam trap 7 is installed between the two second switching valves 6. In this way, the steam trap 7, which can automatically identify steam and water, is installed in the fourth branch pipe 12, so that the fourth branch pipe 12, which is connected to the superheated section 10, can draw out the condensate in the superheated section 10 without releasing steam, thereby achieving the purpose of preventing steam from escaping and draining water.
[0035] In some embodiments of this disclosure, reference is made to Figure 1 As shown, the first drain pipe 1 includes a third branch pipe 11, which is connected in parallel with the fourth branch pipe 12. A second switching valve 6 is installed on the third branch pipe 11. Thus, when the drain valve 7 on the fourth branch pipe 12 malfunctions or requires maintenance, the second switching valve 6 on the fourth branch pipe 12 can be closed, and the second switching valve 6 on the third branch pipe 11 can be opened, allowing the superheated section drain water to flow from the third branch pipe 11 into the second drain pipe 2, thereby ensuring the normal discharge of superheated section drain water during maintenance.
[0036] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.
[0037] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.
[0038] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.
Claims
1. A hydrophobic recovery structure for a high-pressure heater, characterized in that, The condensate recovery structure includes: a first condensate pipe, a second condensate pipe, a third condensate pipe, and a condensate tank. The inlet end of the first condensate pipe is connected to the superheated section of the high-pressure heater. The outlet end of the first condensate pipe is connected to the inlet end of the second condensate pipe. The outlet end of the second condensate pipe is connected to the third condensate pipe. The inlet end of the third condensate pipe is connected to the condenser. The outlet end of the third condensate pipe is connected to the condensate tank. The second condensate pipe is configured as a negative pressure pipe.
2. The hydrophobic recovery structure for a high-pressure heater according to claim 1, characterized in that, The outlet end of the second drain pipe extends into the third drain pipe and is spaced apart from the inner wall of the third drain pipe.
3. The hydrophobic recovery structure for a high-pressure heater according to claim 1 or 2, characterized in that, The second drain pipe includes a first branch pipe and a second branch pipe. The inlet end of the second drain pipe is located in the first branch pipe, and the outlet end of the second drain pipe is located in the second branch pipe. The first branch pipe and the second branch pipe are connected through a first connecting port. The second branch pipe forms an acute angle with the third drainage pipe, and the first connecting port is located between the inlet end of the third drainage pipe and the outlet end of the second drainage pipe.
4. The hydrophobic recovery structure for a high-pressure heater according to claim 3, characterized in that, The angle between the second branch pipe and the third drainage pipe is 25°~65°.
5. The hydrophobic recovery structure for a high-pressure heater according to claim 4, characterized in that, The angle between the second branch pipe and the third drainage pipe is 45°.
6. The hydrophobic recovery structure for a high-pressure heater according to claim 3, characterized in that, The third drain pipe has a second connecting port, and the second branch pipe extends into the third drain pipe through the second connecting port. The outlet end of the third drainage pipe is connected to the bottom of the drainage tank, and the distance between the second connection port and the bottom of the drainage tank is 5mm~35mm.
7. The hydrophobic recovery structure for a high-pressure heater according to claim 6, characterized in that, The second branch pipe is welded to the second connecting port.
8. The hydrophobic recovery structure for a high-pressure heater according to claim 1, characterized in that, The second drain pipe is equipped with a first switch valve.
9. The hydrophobic recovery structure for a high-pressure heater according to claim 1, characterized in that, The first drain pipe includes a fourth branch pipe, on which two second switching valves are provided, and a drain valve is provided between the two second switching valves.
10. The hydrophobic recovery structure for a high-pressure heater according to claim 9, characterized in that, The first drain pipe includes a third branch pipe, which is connected in parallel with the fourth branch pipe, and the third branch pipe is equipped with the second switch valve.