Structure of full-capacity feed pump turbine with single steam exhaust to double backpressure condensers
By designing a structure of a full-capacity water supply pump turbine single-emission to double backpressure condenser, the steam is introduced into the double backpressure condenser by using the main pipe, the first branch pipe and the second branch pipe, and matching the backpressure through the pressure adjustment component, the problem that the single shunt exhaust structure is difficult to discharge into the double backpressure condenser is solved, and the matching of the exhaust structure and the thermal cycling efficiency are improved.
Patent Information
- Application Number
- CN202420358749.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2025-03-04
- Estimated Expiration
- 2034-02-26
AI Technical Summary
It is difficult for the water supply pump turbine with a single-splitting steam exhaust structure to directly discharge steam into both sides of the different backpressures of the double-backpressure double-shell condenser.
A structure of a full-capacity water supply pump turbine single exhaust to dual backpressure condenser is designed. Steam is introduced into different backpressure sides of the dual backpressure condenser through the main pipe, the first branch pipe and the second branch pipe, and a pressure adjustment component is provided in the second branch pipe to adjust the steam pressure to match the backpressure on the low backpressure side of the condenser.
The steam of the water supply pump turbine with a single-splitting exhaust structure can be uniformly discharged into different backpressure sides of the double backpressure double-shell condenser, improving the matching of the exhaust structure and thermal cycling efficiency.
Smart Images
Figure CN222560692U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of thermal power unit systems, in particular to a structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers. Background Art
[0002] The feedwater pump steam turbine is one of the most important auxiliary machines in a large-capacity ultra-supercritical generator set. It uses the steam extracted from the main steam turbine to enter the feedwater pump steam turbine to do work, and coaxially drives the feedwater pump to rotate. The feedwater pump pressurizes the desalted water in the deaerator and sends it to the boiler economizer. In this process, after the steam entering the feedwater pump steam turbine has done work, it will be discharged from the feedwater pump steam turbine to the main steam turbine condenser. The pressure in the main steam turbine condenser is the exhaust back pressure of the low-pressure cylinder of the main steam turbine, which is lower than the atmospheric pressure. The pressure in the condenser directly affects the thermal cycle efficiency of the entire unit. Therefore, it is necessary to ensure the balance and smoothness of the exhaust steam, and at the same time minimize the impact of the exhaust steam on the internal pressure of the condenser.
[0003] The feedwater pump steam turbine of traditional large-capacity ultra-supercritical units of thermal power generation is configured with 2x50% capacity, and the condenser is a double-back pressure double-shell condenser. The exhaust steam of each feedwater pump steam turbine is discharged to a single-side condenser separately. With the advancement of technology, in order to pursue higher efficiency, the feedwater pump steam turbines of a few large-capacity ultra-supercritical units in China currently adopt a single 100% full capacity configuration. However, in order to facilitate the exhaust steam of the feedwater pump steam turbine to be smoothly discharged into the double-back pressure double-shell condenser, the exhaust port of the feedwater pump steam turbine generally adopts a double-split exhaust structure, that is, there are two exhaust ports, each of which is discharged to a single-side condenser separately.
[0004] However, for the feedwater pump steam turbine with a single-split exhaust structure, since the back pressures in the condensers on both sides of the double-back-pressure double-shell condenser are different, and the feedwater pump steam turbine with a single-split exhaust structure has only one exhaust port, it is not convenient to directly discharge steam into the two sides of the double-back-pressure double-shell condenser with different back pressures. Utility Model Content
[0005] The utility model aims to overcome the shortcomings of the prior art and provide a structure of a full-capacity feedwater pump steam turbine with a single exhaust to a double back-pressure condenser.
[0006] The purpose of the utility model is achieved through the following technical solutions: a structure of a full-capacity feedwater pump steam turbine single exhaust to a double back-pressure condenser, comprising a main pipe, a first branch pipe, a second branch pipe and a pressure regulating assembly; the main pipe is used to connect the steam turbine exhaust port; the first branch pipe connects the main pipe and the high back-pressure side of the condenser; the second branch pipe connects the first branch pipe and the low back-pressure side of the condenser; the pressure regulating assembly is arranged in the second branch pipe and is used to adjust the steam inlet pressure entering the low back-pressure side of the condenser from the second branch pipe. The utility model introduces the steam discharged from the feedwater pump steam turbine with a single split exhaust structure into both sides of the double back-pressure double shell condenser by arranging the first branch pipe and the second branch pipe, and reduces the steam pressure entering the low back-pressure side of the condenser from the second branch pipe by arranging the pressure regulating device assembly, so that the exhaust structure matches the two sides of the double back-pressure double shell condenser with different back pressures.
[0007] In some embodiments, the pressure regulating assembly includes a plurality of baffles, which are arranged in the second branch pipe perpendicular to the axial direction of the second branch pipe and located on the same plane, and a plurality of pores whose total area is smaller than the cross-sectional area of the second branch pipe are formed between the baffles. The baffles are provided to adjust the pipeline resistance of the second branch pipe to match the low back pressure side of the double back pressure double shell condenser.
[0008] In some embodiments, the baffles are in a strip shape, and a plurality of the baffles are evenly spaced and arranged in parallel, and the intervals between the baffles form the pores.
[0009] In some embodiments, the first branch pipe and the second branch pipe are both arranged horizontally and in parallel, and a transverse pipe is arranged between the first branch pipe and the second branch pipe and the first branch pipe is connected through the transverse pipe.
[0010] In some embodiments, the mother pipe is vertically arranged, and its bottom end is connected to the first branch pipe, and the mother pipe and the cross pipe are connected to the first branch pipe at the same axial position.
[0011] In some embodiments, a first guide plate is disposed in the first branch pipe, and the first guide plate is disposed close to the mother pipe and is used to guide the steam to the high back pressure side of the condenser and the second branch pipe. The steam is stably and smoothly guided to the high back pressure side of the condenser and the second branch pipe through the first guide plate, reducing the disturbance of the steam inside the condenser when entering the condenser.
[0012] In some embodiments, a second guide plate is disposed in the second branch pipe, the second guide plate is disposed close to the cross pipe and is used to guide the steam to the low back pressure side of the condenser. The second guide plate makes the steam entering the second branch pipe from the cross pipe smooth and stable, avoiding disturbing the inside of the condenser.
[0013] In some embodiments, a third guide plate is further disposed in the first branch pipe, and the third guide plate is located on the inner wall of the first branch pipe directly opposite to the inlet of the mother pipe. The third guide plate prevents the steam entering the first branch pipe from the mother pipe from impacting the inner wall of the first branch pipe.
[0014] In some embodiments, compensators are provided on both the first branch pipe and the second branch pipe. Since both the first branch pipe and the second branch pipe will expand due to heat, the expansion is compensated by the compensator.
[0015] In some embodiments, the first branch pipe and the second branch pipe are both connected to the installation base via a spring bracket, which allows the exhaust structure to vibrate, avoids a hard connection, and plays a buffering role.
[0016] The utility model has the following advantages:
[0017] The steam in the feedwater pump turbine with a single-split exhaust structure is introduced into the two sides of the double-back-pressure double-shell condenser with different back pressures through the main pipe, the first branch pipe and the second branch pipe; at the same time, by setting a pressure regulating component in the second branch pipe, the steam is blocked to match the back pressure on the low back-pressure side of the condenser. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural schematic diagram of the exhaust structure of the feedwater pump steam turbine of the utility model;
[0019] Figure 2 for Figure 1 Cross-section at AA;
[0020] Figure 3 for Figure 1 Cross-section at BB;
[0021] In the figure: 1, main pipe; 2, first branch pipe; 21, first guide plate; 22, third guide plate; 3, second branch pipe; 31, second guide plate; 4, pressure regulating assembly; 41, spoiler; 5, cross pipe; 6, compensator; 7, limit pull rod; 8, spring bracket. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model, that is, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0023] The present invention is further described below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.
[0024] like Figure 1-Figure 3 As shown, a structure of a full-capacity feedwater pump turbine single exhaust to double back-pressure condenser includes a main pipe 1, a first branch pipe 2, a second branch pipe 3 and a pressure regulating assembly 4; the main pipe 1 is used to connect the turbine exhaust port; the first branch pipe 2 connects the main pipe 1 and the high back-pressure side of the condenser; the second branch pipe 3 connects the first branch pipe 2 and the low back-pressure side of the condenser; the pressure regulating assembly 4 is arranged in the second branch pipe 3 and is used to adjust the steam inlet pressure entering the low back-pressure side of the condenser from the second branch pipe 3. Specifically, in this embodiment, one end of the first branch pipe 2 is closed, and the other end is connected to the high back pressure side of the condenser; one end of the second branch pipe 3 is closed, and the other end is connected to the low back pressure side of the condenser; the mother pipe 1 is connected to the single exhaust port of the feedwater pump turbine through a square circle section; during operation of this embodiment, steam enters the first branch pipe 2 from the mother pipe 1, and the first branch pipe 2 is connected to the high back pressure side of the condenser, and the higher pressure steam is directly introduced into the high back pressure side of the condenser. At the same time, the steam enters the second branch pipe 3 connected to the first branch pipe 2, and enters the low back pressure side of the condenser through the second branch pipe 3. Since a pressure regulating component 4 is provided in the second branch pipe 3, specifically, the pressure regulating component 4 is detachably connected to the second branch pipe 3, and the pressure regulating component 4 is used to increase the resistance in the second branch pipe 3. After the steam passes through the pressure regulating component 4, the pressure is reduced, and then enters the low back pressure side of the condenser to match the pressure in the low back pressure side of the condenser. This embodiment enables the feedwater pump turbine with a single split exhaust structure to exhaust steam into a double-back-pressure double-shell condenser, and can adapt to different back pressures on different sides of the double-back-pressure double-shell condenser.
[0025] Preferably, the pressure regulating assembly 4 includes a plurality of baffles 41, which are arranged in the second branch pipe 3 perpendicular to the axial direction of the second branch pipe 3 and located on the same plane, and a plurality of pores whose total area is smaller than the cross-sectional area of the second branch pipe 3 are formed between the baffles 41. Specifically, in this embodiment, the baffles 41 are connected to the second branch pipe 3 by bolts, and the resistance in the second branch pipe 3 is adjustable by using the detachable baffles 41. According to the design operating back pressure parameters of the condenser when the equipment is installed, a suitable number of baffles 41 are installed.
[0026] Preferably, the spoiler 41 is in a strip shape, and a plurality of the spoilers 41 are evenly spaced and arranged in parallel, and the intervals between the spoilers 41 form the pores. Specifically, in this embodiment, both ends of the spoiler 41 are bolted to the second branch pipe 3, and the spoilers 41 have different lengths, with a longer spoiler 41 being arranged in the middle and a shorter spoiler 41 being arranged at the edge.
[0027] Preferably, the first branch pipe 2 and the second branch pipe 3 are both arranged horizontally and in parallel, and a transverse pipe 5 is arranged between the first branch pipe 2 and the second branch pipe 3 and the first branch pipe 2 and the second branch pipe 3 are connected through the transverse pipe 5. The parallel arrangement of the first branch pipe 2 and the second branch pipe 3 facilitates the connection of the condenser. The steam entering from the mother pipe 1 passes through the first branch pipe 2 and the transverse pipe 5 and enters the second branch pipe 3. This process also plays a role in reducing a certain pressure, so that the back pressure in the second branch pipe 3 is less than the back pressure in the first branch pipe 2 before the pressure regulating assembly 4.
[0028] Preferably, the mother pipe 1 is vertically arranged, and its bottom end is connected to the first branch pipe 2 , and the mother pipe 1 and the cross pipe 5 are connected to the first branch pipe 2 at the same axial position.
[0029] Preferably, a first guide plate 21 is provided in the first branch pipe 2, and the first guide plate 21 is provided close to the mother pipe 1 and is used to guide the steam to the high back pressure side of the condenser and the second branch pipe 3. Specifically, in this embodiment, the first guide plate 21 is arc-shaped, and the arc-shaped first guide plate 21 allows the steam to enter the first branch pipe 2 smoothly, avoids the steam from entering the closed end of the first branch pipe 2, and allows the steam to enter the condenser smoothly, avoiding disturbing the internal state of the condenser.
[0030] Preferably, a second guide plate 31 is provided in the second branch pipe 3. The second guide plate 31 is provided close to the transverse pipe 5 and is used to guide the steam to the low back pressure side of the condenser. Specifically, in this embodiment, the second guide plate 31 is arc-shaped, so that the steam in the transverse pipe 5 turns at a right angle to enter the second branch pipe 3. The arc-shaped second guide plate 31 makes the steam flow more smoothly, avoids disturbance inside the condenser, and prevents the steam from entering the closed end of the second branch pipe 3.
[0031] Preferably, a third guide plate 22 is further provided in the first branch pipe 2, and the third guide plate 22 is located on the inner wall of the first branch pipe 2 directly facing the inlet of the mother pipe 1. Specifically, in this embodiment, the third guide plate 22 directly faces the inlet of the mother pipe 1 on the first branch pipe 2, and when the steam enters the first branch pipe 2 through the mother pipe 1, a large impact on the inner wall of the first branch pipe 2 is avoided.
[0032] Preferably, the first branch pipe 2 and the second branch pipe 3 are both provided with a compensator 6. Specifically, a limit rod 7 is also provided on the first branch pipe 2 and the second branch pipe 3, and the limit rod 7 connects the pipe segments segmented by the compensator 6. When the pipeline expands due to heat, the compensator 6 is used to compensate for the deformation between the pipe segments. At the same time, the limit rod 7 is used to balance the thrust of the compensator 6. The compensator 6 is a common component for those skilled in the art, and its detailed structure is not described here.
[0033] Preferably, the first branch pipe 2 and the second branch pipe 3 are both connected to the installation base through a spring bracket 8. Specifically, in this embodiment, the installation base can be the ground or the surface of a building, etc. The spring bracket 8 can play a certain buffering role when the exhaust structure vibrates, avoiding damage to the exhaust structure caused by a hard connection between the exhaust structure and the installation base. The spring bracket 8 is a common component for those skilled in the art, and its detailed structure is not repeated here.
[0034] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Any technician familiar with the field can make many possible changes and modifications to the technical solution of the utility model by using the above-mentioned technical content without departing from the scope of the technical solution of the utility model, or modify it into an equivalent embodiment of equivalent changes. Therefore, any changes, modifications, equivalent changes and modifications made to the above embodiments based on the technology of the utility model without departing from the content of the technical solution of the utility model shall fall within the protection scope of the technical solution of the utility model.
Claims
1. A structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers, characterized in that: include: A main pipe (1), the main pipe (1) being used for connecting to a steam exhaust port of a steam turbine; A first branch pipe (2), the first branch pipe (2) being connected to the main pipe (1) and the high back pressure side of the condenser; A second branch pipe (3), wherein the second branch pipe (3) is connected to the first branch pipe (2) and the low back pressure side of the condenser; and a pressure regulating assembly (4), which is arranged in the second branch pipe (3) and is used to regulate the inlet pressure of steam entering the low back pressure side of the condenser from the second branch pipe (3).
2. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 1, characterized in that: The pressure regulating assembly (4) comprises a plurality of baffles (41), wherein the baffles (41) are arranged in the second branch pipe (3) perpendicular to the axial direction of the second branch pipe (3) and are located on the same plane, and a plurality of pores having a total area smaller than a cross-sectional area of the second branch pipe (3) are formed between the baffles (41).
3. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 2, characterized in that: The baffles (41) are in a strip shape, and a plurality of the baffles (41) are evenly spaced and arranged in parallel, with the intervals between the baffles (41) forming the pores.
4. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 1, characterized in that: The first branch pipe (2) and the second branch pipe (3) are both arranged horizontally and in parallel, and a transverse pipe (5) is arranged between the first branch pipe (2) and the second branch pipe (3) and are connected via the transverse pipe (5).
5. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 4, characterized in that: The mother pipe (1) is arranged vertically, and its bottom end is connected to the first branch pipe (2). The mother pipe (1) and the cross pipe (5) are connected to the first branch pipe (2) at the same axial position.
6. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 4, characterized in that: A first guide plate (21) is arranged in the first branch pipe (2), and the first guide plate (21) is arranged close to the main pipe (1) and is used to guide steam to the high back pressure side of the condenser and the second branch pipe (3).
7. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 4, characterized in that: A second guide plate (31) is arranged in the second branch pipe (3), and the second guide plate (31) is arranged close to the cross pipe (5) and is used to guide the steam to the low back pressure side of the condenser.
8. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 1, characterized in that: A third guide plate (22) is also provided in the first branch pipe (2), and the third guide plate (22) is located on the inner wall of the first branch pipe (2) directly facing the inlet of the main pipe (1).
9. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 1, characterized in that: Compensators (6) are provided on both the first branch pipe (2) and the second branch pipe (3).
10. The structure of a full-capacity feedwater pump steam turbine with single exhaust to double back-pressure condensers according to claim 1, characterized in that: The first branch pipe (2) and the second branch pipe (3) are both connected to the installation base via a spring bracket (8).