Thermal drain device for steam turbine of thermal power plant
By employing a special condensate drainage mechanism and warm steam method in the steam engine, bidirectional condensate drainage is achieved, solving the problems of cumbersome and costly condensate drainage in existing technologies, and improving the safety, stability and operating efficiency of the steam engine.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- DATANG BINZHOU POWER GENERATION CO LTD
- Filing Date
- 2023-01-29
- Publication Date
- 2026-05-29
Smart Images
Figure CN116181430B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power plant equipment technology, specifically to a thermal condensate drain device for a steam turbine in a thermal power plant. Background Technology
[0002] During the cold start-up of steam power units, superheated start-up steam condenses and accumulates on the cooler inner walls of the cylinder or diffuser, forming water. This water accumulation negatively impacts the unit's rapid start-up and temperature rise. If the water is not drained from the chamber in a timely manner, a low-temperature zone will form in the water-affected area, generating thermal stress and posing a potential threat to the safe operation of the unit. Therefore, water drainage during cold start-up is always a major concern.
[0003] A thermal steam trap is a very robust and simple-to-operate steam trap. This type of steam trap works by the power generated when flash steam passes through the steam trap. The steam trap is installed at the end of the steam pipeline, and the condensate in the pipeline is continuously discharged to the outside of the pipeline.
[0004] A thermal condensate trap, simply put, is a water control valve. However, current products mainly use a vertical pipe design. While opening it allows residual condensate to drain, it has significant drawbacks. For example, simply opening or closing the trap doesn't completely drain the condensate; additional power is needed. For steam engines, condensate has a significant impact. Although current thermal condensate traps can drain condensate via an on / off switch, new condensate will reappear in the pipes during pre-steam transport. Furthermore, since the trap connects to both the transport pipe and the steam engine inlet, condensate from the steam engine still needs to be drained using other methods, which is cumbersome and increases the operating cost of the steam engine. Summary of the Invention
[0005] In view of this, this application provides a thermal condensate draining device for steam turbines in thermal power plants to alleviate the technical problem that existing technologies require additional means to discharge condensate from steam turbines, resulting in cumbersome operation and increased costs.
[0006] In a first aspect, embodiments of the present invention provide a thermal condensate drain device for a steam turbine in a thermal power plant, comprising a steam pipe, a condensate drain pipe, and a condensate draining mechanism; the steam pipe is installed on both sides of the condensate drain pipe and is assembled with the condensate drain pipe in a cross shape; the condensate draining mechanism is disposed within the cavity of the condensate drain pipe; the condensate draining mechanism includes a sealing strip, an air outlet, a steam passage, and a discharge port; the sealing strip is movably engaged with the cavity of the condensate drain pipe, the air outlet is located on the surface of the sealing strip, the steam passage is located inside the sealing strip, and the discharge port is located on the side of the condensate drain pipe; one end of the steam passage is connected to the air outlet, and the other end of the steam passage is connected to the discharge port; a fan blade is provided in the steam passage directly opposite the air outlet; the exhaust direction of the fan blade is towards the cavity of the steam passage.
[0007] Furthermore, rotating holes are provided at both ends of the sealing strip, the inner cavity of the rotating hole is movably engaged with the limiting plate, one side of the limiting plate is fixedly connected to one end of the screw, and the other end of the screw is fixedly connected to the operating plate.
[0008] Furthermore, a steam vent is provided in the middle of the sealing strip; the air vents are symmetrically arranged about the steam vent.
[0009] Furthermore, a partition is provided in the middle of the steam passage, and a through hole is provided on the partition. A bearing is installed in the inner cavity of the through hole. A rotating shaft is installed through the inner ring of the bearing, and a collar is installed at both ends of the outer ring of the rotating shaft by bolts. The fan blade is fixedly connected to the outer ring of each collar.
[0010] Furthermore, both ends of the rotating shaft are fixed with cones; the exhaust direction of the fan blades at both ends of the rotating shaft is towards the inner cavity of the steam passage.
[0011] This invention provides a thermal condensate drain device for a steam turbine in a thermal power plant. It employs a special draining mechanism in conjunction with warm steam to discharge condensate. During the draining process, a sealing strip separates the steam turbine from the pipeline, ensuring the safety of the draining process. No condensate enters the steam turbine during draining, guaranteeing safety and preheating the pipeline to prevent the generation of new condensate during cold starts, thus improving the safe and stable operation of the steam turbine. By installing fan blades inside the draining pipe, the force generated by the preheated steam flow creates a rotational force, which draws in residual condensate from the steam turbine, achieving bidirectional draining. This alleviates the technical problems of existing technologies that require additional methods for draining condensate from the steam turbine, leading to cumbersome operation and increased costs. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0013] Figure 1 A schematic diagram of a thermal condensate drain device for a steam turbine in a thermal power plant, provided in an embodiment of the present invention;
[0014] Figure 2 This is a structural breakdown diagram of a thermal condensate drain device for a steam turbine in a thermal power plant, provided by an embodiment of the present invention.
[0015] Figure 3 This is a schematic diagram of a hydrophobic mechanism provided in an embodiment of the present invention;
[0016] Figure 4 This is a partial structural diagram of a hydrophobic mechanism provided in an embodiment of the present invention.
[0017] Explanation of icon numbers:
[0018] 1-Steam pipe; 2-Drain pipe; 3-Blocking strip; 4-Air outlet; 5-Steam passage; 6-Discharge port; 7-Rotating hole; 8-Limiting plate; 9-Screw; 10-Operating plate; 11-Steam port; 12-Bearing; 13-Shaft; 14-Collar; 15-Fan blade; 16-Cone. Detailed Implementation
[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.
[0020] Figure 1 This is a schematic diagram of a thermal condensate drain device for a steam turbine in a thermal power plant, provided according to an embodiment of the present invention. Figure 1 As shown, the device includes a steam pipe 1, a drain pipe 2, and a draining mechanism. The steam pipe 1 is installed on both sides of the drain pipe 2 and is assembled with the drain pipe 2 in a cross shape; the draining mechanism is disposed in the inner cavity of the drain pipe 2.
[0021] Figure 2 This is a structurally disassembled schematic diagram of a thermal condensate drain device for a steam turbine in a thermal power plant, provided by an embodiment of the present invention. Figure 2As shown, the drainage mechanism includes a sealing strip 3, an air vent 4, a steam channel 5, and a discharge port 6. The sealing strip 3 is movably engaged with the inner cavity of the drainage pipe 2. The air vent 4 is located on the surface of the sealing strip 3. The steam channel 5 is located inside the sealing strip 3. The discharge port 6 is located on the side of the drainage pipe 2. One end of the steam channel 5 is connected to the air vent 4, and the other end of the steam channel 5 is connected to the discharge port 6.
[0022] Figure 3 This is a schematic diagram of a hydrophobic mechanism provided according to an embodiment of the present invention. Figure 3 As shown, a fan blade 15 is installed in the steam duct 5 directly opposite the air inlet 4; the exhaust direction of the fan blade 15 is towards the inner cavity of the steam duct 5.
[0023] This invention provides a thermal condensate drain device for a steam turbine in a thermal power plant. It employs a special draining mechanism in conjunction with warm steam to discharge condensate. During the draining process, a sealing strip separates the steam turbine from the pipeline, ensuring the safety of the draining process. No condensate enters the steam turbine during draining, guaranteeing safety and preheating the pipeline to prevent the generation of new condensate during cold starts, thus improving the safe and stable operation of the steam turbine. By installing fan blades inside the draining pipe, the force generated by the preheated steam flow creates a rotational force, which draws in residual condensate from the steam turbine, achieving bidirectional draining. This alleviates the technical problems of existing technologies that require additional methods for draining condensate from the steam turbine, leading to cumbersome operation and increased costs.
[0024] Optionally, such as Figure 2 and Figure 3 As shown, rotating holes 7 are opened at both ends of the sealing strip 3. The inner cavity of the rotating hole 7 is movably engaged with the limiting plate 8. One side of the limiting plate 8 is fixedly connected to one end of the screw 9, and the other end of the screw 9 is fixedly connected to the operating plate 10.
[0025] like Figure 3 As shown, a steam inlet 11 is opened in the middle of the sealing strip 3; the air inlet 4 is symmetrically arranged about the steam inlet 11.
[0026] In this embodiment of the invention, one end of the steam pipe 1 is connected to the steam delivery pipe, and the other end of the steam pipe 1 is connected to the steam inlet of the steam engine. Before cold-starting the steam engine, the operating disc 10 is rotated to drive the screw 9 to rotate. The screw 9, through the cooperation of the limiting disc 8 and the rotating hole 7, drives the sealing strip 3 to move in the inner cavity of the drain pipe 2. Taking the movement to the right as an example, the air vent 4 is connected to the inner cavity of the steam pipe 1. The remaining part of the sealing strip 3 directly contacts and squeezes the inner wall of the drain pipe 2 to maintain the seal. Then the steam delivery operation can be carried out. When the steam flows in the pipe, it can heat the condensate in the pipe, causing some of the condensate to turn back into gas. At the same time, it can also drive the condensate to move in the pipe through friction generated by contact with the condensate. Then it enters the inner cavity of the steam passage 5 from the air vent and is finally discharged to the outside through the discharge port 6.
[0027] The device provided in this embodiment of the invention uses a special condensate draining mechanism in conjunction with warm steam to discharge condensate. During the condensate draining process, the sealing strip 3 separates the steam engine from the pipeline, ensuring the safety of the condensate draining process. That is, no condensate will enter the steam engine during the condensate draining process, thus ensuring the safety of the condensate draining process. The special structure of the condensate draining mechanism, in conjunction with the steam discharge process, can also preheat the pipeline, preventing the generation of new condensate during cold starts, and improving the safety and stability of the steam engine operation.
[0028] In this embodiment of the invention, after the condensate drainage is completed, the operating disc 10 is rotated again. Through the combined use of the screw 9, the limiting disc 8, and the rotating hole 7, the sealing strip 3 is pushed back to the middle of the drain pipe 2, so that the two ends of the steam port 11 are connected to the conveying pipe and the steam inlet of the steam engine, respectively. In this way, steam can flow from the conveying pipe through the drain device and enter the steam system. During this process, the other parts of the sealing strip 3 contact and squeeze the inner wall of the drain pipe 3 to prevent steam leakage.
[0029] Optionally, such as Figure 3 As shown, a baffle is provided in the middle of the steam passage 5, and through holes are provided on the baffle.
[0030] Figure 4 This is a partial structural diagram of a hydrophobic mechanism provided according to an embodiment of the present invention. Figure 4 As shown, a bearing 12 is installed in the inner cavity of the through hole, and a rotating shaft 13 is installed through the inner ring of the bearing 12. Both ends of the outer ring of the rotating shaft 13 are bolted with collars 14; a fan blade 15 is fixedly connected to the outer ring of each collar 14.
[0031] In this embodiment of the invention, when decondensing, steam enters the vent 4 and impacts the surface of the fan blade 15, applying an impact force to it. The fan blade 15 then rotates, driving the shaft 13 to rotate via the collar 14. This rotation of the fan blade 15 at the other end of the shaft 13 generates an attractive force, drawing air from the steam engine. The airflow then carries away the residual condensate from the steam engine, finally discharging it to the outside through the steam duct 5. By using symmetrically arranged fan blades, utilizing the force generated by the preheated steam flow to rotate and generate an attractive force, residual condensate in the steam engine can be drawn away, achieving bidirectional decondensation.
[0032] like Figure 4 As shown, both ends of the rotating shaft 13 are fixed with cones 16; the exhaust direction of the fan blades 15 at both ends of the rotating shaft 13 is towards the inner cavity of the steam passage 5. In this embodiment of the invention, the main function of the cones 16 is to divert the flowing water vapor, thereby allowing the flowing steam to disperse and impact the surface of the fan blades 15, achieving the purpose of rotating the fan blades 15. The fixed exhaust direction of the fan blades 15 is mainly to prevent outside air from flowing back into the various pipes during condensation.
[0033] Compared with the prior art, the beneficial effects of the present invention are:
[0034] 1. The embodiment of the present invention provides a thermal condensate drain device for a steam turbine in a thermal power plant. It uses a special condensate draining mechanism in conjunction with warm steam to discharge condensate. During the condensate draining process, the sealing strip separates the steam turbine from the pipeline, which can ensure the safety of the condensate draining process. That is, no condensate will enter the steam turbine during the condensate draining process, thus ensuring the safety of the condensate draining process.
[0035] 2. The embodiment of the present invention provides a thermal condensate drain device for a steam turbine in a thermal power plant. The special structure of the condensate drain device works in conjunction with the steam to discharge condensate. It can also preheat the pipeline, prevent the generation of new condensate during cold start, and improve the safety and stability of the steam turbine operation.
[0036] 3. The thermal condensate draining device for a steam turbine in a thermal power plant provided in this embodiment of the invention uses symmetrically arranged fan blades to rotate using the force generated by the preheated and smooth flow, which generates a certain attraction force to draw away the residual condensate in the steam turbine, thus achieving the purpose of bidirectional condensate draining.
[0037] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A thermal condensate drain device for a steam turbine in a thermal power plant, comprising a steam pipe, a condensate drain pipe, and a condensate draining mechanism; characterized in that, The steam pipes are installed on both sides of the drain pipe and are assembled with the drain pipe in a cross shape; the draining mechanism is disposed in the inner cavity of the drain pipe; The drainage mechanism includes a sealing strip, an air vent, a steam duct, and a discharge port; the sealing strip is movably engaged with the inner cavity of the drainage pipe, the air vent is located on the surface of the sealing strip, the steam duct is located inside the sealing strip, and the discharge port is located on the side of the drainage pipe. One end of the steam duct is connected to the air vent, and the other end of the steam duct is connected to the exhaust port; a fan blade is provided inside the steam duct, directly opposite the air vent; the exhaust direction of the fan blade is towards the inner cavity of the steam duct; A steam vent is provided in the middle of the sealing strip; the air vents are arranged symmetrically about the steam vent; A partition is provided in the middle of the steam passage, and a through hole is provided on the partition. A bearing is installed in the inner cavity of the through hole. A rotating shaft is installed through the inner ring of the bearing, and a collar is installed at both ends of the outer ring of the rotating shaft by bolts. The fan blade is fixedly connected to the outer ring of each collar.
2. The thermal condensate drain device for a steam turbine in a thermal power plant according to claim 1, characterized in that, The sealing strip has rotating holes at both ends. The inner cavity of the rotating hole is movably engaged with the limiting plate. One side of the limiting plate is fixedly connected to one end of the screw, and the other end of the screw is fixedly connected to the operating plate.
3. The thermal condensate drain device for a steam turbine in a thermal power plant according to claim 1, characterized in that, Both ends of the rotating shaft are fixed with cones; the exhaust direction of the fan blades at both ends of the rotating shaft is towards the inner cavity of the steam passage.