Steam turbine shaft seal overflowed steam recovery device

Abstract

The utility model relates to the technical field of shaft seal heaters, in particular to a steam turbine shaft seal overflowed steam recovery device which comprises a partition plate transversely arranged in a saline water treatment box, and the partition plate divides the saline water treatment box into an exchange cavity and a drainage cavity from top to bottom. A heat inlet pipe is arranged on the exchange cavity above the water passing pipe; the heat conducting plate is transversely arranged in the drainage cavity and divides the drainage cavity into a distillation cavity and a heating cavity from top to bottom, and the distillation cavity is communicated with the condenser through an air outlet pipe; the heating assembly is arranged in the heating cavity; the stirring assembly is arranged in the distillation cavity, and the driving assembly is connected with the stirring assembly and the heating assembly and drives the stirring assembly and the heating assembly to operate. The device has the advantages of effectively recycling saline water and the like.

Description

Technical Field

[0001] This utility model relates to the field of shaft seal heater technology, specifically a steam turbine shaft seal overflow recovery device. Background Technology

[0002] The function of the turbine shaft seal steam system is to provide sealing steam to the shaft end seals of the main unit and auxiliary units, preventing heat loss and contamination caused by steam leakage in the high-pressure area, and preventing air leakage in the negative-pressure area, which would affect the vacuum. During normal unit operation, steam does not need to be supplied from outside the system; leaking steam from the high- and medium-pressure end shaft seals is sent to the low-pressure end steam seal, and excess leaking steam overflows to the condenser. During unit start-up and shutdown, a backup steam source is used to supply steam to the shaft seals. This backup steam source is auxiliary steam, and its supply pressure and temperature are controlled by the steam source pressure control station, overflow control station, and temperature control station to meet the requirements of the shaft seal system under different operating conditions.

[0003] The shaft seal overflow valve maintains at least 5% opening during normal operation to ensure the backup steam source for the shaft seal is in a hot standby state. However, this also results in the waste of this high-quality steam. Therefore, the leaking steam from the shaft seal exchanges heat with the condensate in the water pipe through the heat inlet pipe. When the hot steam encounters the low-temperature water pipe, a large amount of condensate is generated on the outer wall of the water pipe. The main component of this condensate is brine. The traditional method for treating this brine is to directly discharge it into the wastewater treatment plant, which results in the waste of the brine. Utility Model Content

[0004] In view of this, the present invention provides a steam turbine shaft seal overflow recovery device, which aims to solve the technical problem of waste of brine in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a turbine shaft seal overflow steam recovery device, comprising:

[0006] A brine treatment tank has a horizontally arranged partition inside, which divides the brine treatment tank into an exchange chamber and a drainage chamber from top to bottom. A drain pipe is provided on the partition, a water pipe is provided in the exchange chamber, and a heat inlet pipe is provided on the exchange chamber above the water pipe.

[0007] A heat-conducting plate is horizontally arranged in the hydrophobic cavity. The heat-conducting plate divides the hydrophobic cavity from top to bottom into a distillation cavity and a heating cavity. The distillation cavity is connected to the condenser through an outlet pipe.

[0008] A heating assembly is disposed within the heating chamber;

[0009] A stirring assembly is disposed inside the distillation chamber, and a driving assembly is connected to the stirring assembly and the heating assembly respectively, and drives the stirring assembly and the heating assembly to operate respectively.

[0010] A further improvement of this invention is that the stirring assembly includes:

[0011] The stirring shaft is horizontally positioned inside the distillation chamber, with its end passing through the distillation chamber and connected to the drive assembly. Under the drive of the drive assembly, it rotates alternately in both directions.

[0012] Multiple stirring frames are arranged on the stirring shaft and distributed along the circumference of the stirring shaft;

[0013] Multiple stirring plates are provided, each corresponding to one of the multiple stirring frames. The two ends of each stirring plate are connected to the rotating shafts on both sides of the inner wall of the stirring frame.

[0014] A further improvement of this utility model is that the heating component includes:

[0015] A heating plate is arranged horizontally inside the heating cavity and has multiple through holes on it;

[0016] A first rotating shaft is horizontally disposed in the heating cavity below the heating plate. The first rotating shaft is parallel to the stirring shaft. The end of the first rotating shaft passes through the heating cavity and is connected to the driving assembly. The driving assembly drives the first rotating shaft to rotate alternately in both directions. A blower plate is disposed on the first rotating shaft in the heating cavity along its axial direction.

[0017] A further improvement of this utility model is that the driving component includes:

[0018] The first connecting rod has its first end connected to the end of the stirring shaft. The first connecting rod swings around its first end as the center under the drive of the first driving source.

[0019] A rack is horizontally and slidably mounted on the brine treatment tank. The rack is perpendicular to the first rotating shaft. A first elongated slot at the second end of the first connecting rod is slidably connected to a first guide post on the rack. The rack meshes with a gear at the end of the first rotating shaft.

[0020] A further improvement of this utility model is that the first driving source is a hydraulic cylinder, which is mounted on the brine treatment tank, and the second guide post at the end of its piston rod is slidably connected to the second elongated slot in the middle of the first connecting rod.

[0021] A further improvement of this invention is that the stirring plate is provided with water passage holes.

[0022] A further improvement of this utility model is that a gas distribution plate is provided horizontally between the lower end of the heat inlet pipe and the water pipe, and a plurality of vent holes are provided on the gas distribution plate, with a jet nozzle provided below each vent hole.

[0023] A further improvement of this utility model is that a one-way valve is provided inside the drain pipe.

[0024] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0025] This invention provides a steam turbine shaft seal overflow recovery device. The generated brine enters the distillation chamber through the drain pipe. Subsequently, the drive assembly drives the first rotating shaft to rotate alternately in both directions. The first rotating shaft drives the blower plate to swing, and the blower plate blows the heat from the heating plate through the through hole to the heat-conducting plate, so that the heat-conducting plate heats the brine. Then, while the drive assembly drives the first rotating shaft to rotate alternately in both directions, the drive assembly also drives the stirring shaft to rotate alternately in both directions. The stirring shaft drives the stirring frame to rotate, which allows the brine to pass through the water passage and rotate the stirring plate. The rotation of the stirring frame and the stirring plate can generate forces in different directions in the horizontal direction for the brine, thereby accelerating the distillation speed. The distilled salt-free water vapor enters the condenser through the exhaust pipe and can be recycled. Compared with the prior art, it can effectively recover and utilize the brine. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall structure of the turbine shaft seal overflow recovery device of this utility model;

[0028] Figure 2 This is a schematic diagram of the stirring assembly structure of the turbine shaft seal overflow recovery device of this utility model;

[0029] Figure 3 This is a schematic diagram of the heating component structure of the turbine shaft seal overflow recovery device of this utility model;

[0030] Figure 4 This is a schematic diagram of the drive assembly structure of the turbine shaft seal overflow recovery device of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10-Condenser, 101-Outlet pipe, 11-Brine treatment tank, 111-Baffle plate, 112-Drain pipe, 113-Water pipe, 114-Heat inlet pipe, 12-Heat conducting plate, 13-Heating plate, 131-Through hole, 20-Stirring assembly, 21-Stirring shaft, 22-Stirring frame, 23-Stirring plate, 24-Water hole, 30-Heating assembly, 31-First rotating shaft, 32-Blower plate, 40-Drive assembly, 41-First connecting rod, 411-First long slot, 412-Second long slot, 42-Hydraulic cylinder, 421-Second guide column, 43-Rack, 431-First guide column, 44-Gear, 50-Gas distribution plate, 51-Vent hole, 52-Jet nozzle. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, in the following description, specific details such as particular system structures and technologies are set forth for illustrative purposes rather than for limiting purposes, in order to provide a thorough understanding of the embodiments of the present invention. However, those skilled in the art should understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details hindering the description of the present invention.

[0034] This utility model provides a steam turbine shaft seal overflow recovery device, which, in conjunction with the appendix to the instruction manual, is described in detail below. Figure 1 To be continued Figure 4 It can be seen that the turbine shaft seal overflow recovery device mainly includes the following parts or components: brine treatment tank 11, heat conduction plate 12, heating component 30, and stirring component 20.

[0035] In this invention, a brine treatment tank 11 is horizontally partitioned by a partition 111, which divides the brine treatment tank 11 into an exchange chamber and a drainage chamber from top to bottom. A drain pipe 112 is installed on the partition 111. A water pipe 113 is installed in the exchange chamber, and a heat inlet pipe 114 is installed on the exchange chamber above the water pipe 113. A heat-conducting plate 12 is horizontally installed in the drainage chamber, which divides the drainage chamber into a distillation chamber and a heating chamber from top to bottom. The distillation chamber is connected to the condenser 10 through an outlet pipe. A heating assembly 30 is installed in the heating chamber. A stirring assembly 20 is installed in the distillation chamber. A driving assembly 40 is connected to the stirring assembly 20 and the heating assembly 30 respectively, and drives the stirring assembly 20 and the heating assembly 30 to operate respectively.

[0036] The leaking air from the shaft seal enters the exchange chamber through the heat inlet pipe 114, heating the condensate in the water pipe 113. This effectively recovers and utilizes the leaking air from the shaft seal. During the heating process, the brine generated on the outer wall of the water pipe 113 falls to the bottom of the exchange chamber and then flows into the distillation chamber through the drain pipe 112. Subsequently, the drive assembly 40 drives the heating assembly 30 to operate, and at the same time, the drive assembly 40 drives the stirring assembly 20 to operate. The stirring assembly 20 stirs the brine, causing the brine to generate forces in different directions in the horizontal direction, which can accelerate the distillation speed. The distilled, salt-free water vapor enters the condenser 10 through the exhaust pipe 101 for recycling. Compared with the prior art, this method can effectively recover and utilize the brine.

[0037] Specifically, monitoring equipment can be used to monitor the pressure, temperature, and flow rate of steam leakage at the high and medium pressure end shaft seals to prevent excessive leakage from affecting the use of other equipment. It can also serve as a basis for the shaft seal connected to the end of the heat inlet pipe 114, so that the flow rate, temperature, and pressure of steam flowing into the heat inlet pipe 114 can be known at any time.

[0038] Specifically, an air extraction device is installed inside the vent pipe 101 to draw the vaporized water into the condenser 10. The air extraction device is existing technology and will not be described in detail here.

[0039] As one embodiment, in conjunction with the appendix to the specification Figure 2 As can be seen, the stirring assembly 20 includes a stirring shaft 21, which is horizontally arranged inside the distillation chamber. Its end passes through the distillation chamber and is connected to the drive assembly 40, and rotates alternately in both directions under the drive of the drive assembly 40. Multiple stirring frames 22 are fixedly arranged on the stirring shaft 21 and are evenly distributed along the circumference of the stirring shaft 21. Multiple stirring plates 23 correspond one-to-one with the multiple stirring frames 22, and the two ends of the stirring plates 23 are respectively connected to the rotating shafts on both sides of the inner wall of the stirring frame 22. Water passage holes 24 are provided on the stirring plates 23.

[0040] The drive assembly 40 drives the stirring shaft 21 to rotate alternately in both directions. The stirring shaft 21 drives the stirring frame 22 to rotate, which allows the brine to pass through the water passage 24 and rotate the stirring plate 23. The rotation of the stirring frame 22 and the stirring plate 23 can generate forces in different directions in the horizontal direction of the brine, so that the flow direction of the brine in the distillation chamber is constantly changing, making the brine very uniform and thorough. Through this stirring method, the liquid surface of the brine is constantly renewed and stirred, and water molecules can evaporate more efficiently, thereby accelerating the distillation speed.

[0041] In this embodiment, refer to the appendix to the specification. Figure 1 Appendix Figure 3It is known that the heating component 30 includes a heating plate 13 horizontally disposed in the heating chamber, which has multiple through holes 131; a first rotating shaft 31 is horizontally disposed in the heating chamber below the heating plate 13, the first rotating shaft 31 is parallel to the stirring shaft 21, and the end of the first rotating shaft 31 passes through the heating chamber and is connected to the driving component 40. The driving component 40 drives the first rotating shaft 31 to rotate alternately in both directions. A blower plate 32 is fixedly disposed on the first rotating shaft 31 in the heating chamber along its axial direction.

[0042] The drive assembly 40 drives the first rotating shaft 31 to rotate alternately in both directions. The first rotating shaft 31 drives the blower plate 32 to swing. The blower plate 32 blows the heat from the heating plate 13 through the through hole 131 onto the heat-conducting plate 12, so that the heat-conducting plate 12 heats the brine.

[0043] In this embodiment, refer to the appendix to the specification. Figure 4 It is known that the drive assembly 40 includes a first connecting rod 41, the first end of which is connected to the end of the stirring shaft 21. The first connecting rod 41 swings around the first end of the first connecting rod 41 under the drive of the first drive source. A rack 43 is horizontally and slidably mounted on the brine treatment tank 11. The rack 43 is perpendicular to the first rotating shaft 31. A first elongated slot 411 at the second end of the first connecting rod 41 is slidably connected to a first guide post 431 on the rack 43. The rack 43 meshes with a gear 44 at the end of the first rotating shaft 31. The first drive source is a hydraulic cylinder 42, which is fixedly mounted on the brine treatment tank 11. A second guide post 421 fixedly mounted at the end of its piston rod is slidably connected to a second elongated slot 412 in the middle of the first connecting rod 41.

[0044] The extension and retraction of the piston rod end of the hydraulic cylinder 42 drives the extension and retraction of the second guide post 421. Through the cooperation between the second guide post 421 and the second long slot 412, the first connecting rod 41 swings. The upper end of the first connecting rod 41 drives the stirring shaft 21 to rotate alternately in both directions. The lower end drives the rack 43 to slide horizontally through the cooperation between the first long slot 411 and the first guide post 431. The rack 43 drives the first rotating shaft 31 to rotate alternately in both directions through the gear 44.

[0045] In this embodiment, the stirring shaft 21, stirring frame 22, and stirring plate 23 are all coated with anti-rust paint. This effectively reduces the risk of corrosion of the stirring shaft 21, stirring frame 22, and stirring plate 23 when they are stirred in salt water.

[0046] As one embodiment, a one-way valve (not shown in the figure) is provided inside the drain pipe 112. The one-way valve prevents vaporized water from re-entering the drain pipe 112.

[0047] As one embodiment, in conjunction with the appendix to the specification Figure 1It can be seen that a steam distribution plate 50 is horizontally arranged between the lower end of the heat inlet pipe 114 and the water pipe 113. The steam distribution plate is provided with multiple vent holes 51, and a jet nozzle 52 is provided below each vent hole. This can effectively make the steam evenly sprayed onto the water pipe 113.

[0048] The turbine shaft seal overflow steam recovery device provided by this utility model operates as follows:

[0049] The leaking air from the shaft seal enters the exchange chamber through the heat inlet pipe 114, heating the condensate in the water pipe 113. This effectively recovers and utilizes the leaking air from the shaft seal. During the heating process, the brine generated on the outer wall of the water pipe 113 falls to the bottom of the exchange chamber and then flows into the distillation chamber through the drain pipe 112. Subsequently, the drive assembly 40 drives the heating assembly 30 to operate, and at the same time, the drive assembly 40 drives the stirring assembly 20 to operate. The stirring assembly 20 stirs the brine, causing the brine to generate forces in different directions in the horizontal direction, which can accelerate the distillation speed. The distilled, salt-free water vapor enters the condenser 10 through the exhaust pipe 101 for recycling and reuse, effectively recovering and utilizing the brine.

[0050] It should be noted that in this patent application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A steam turbine shaft seal bleed recovery apparatus, characterized by, It includes: A saltwater treatment box, a partition is arranged transversely in the saltwater treatment box, the partition divides the saltwater treatment box into an exchange cavity and a hydrophobic cavity from top to bottom, a drain pipe is arranged on the partition, a water pipe is arranged in the exchange cavity, a heat inlet pipe is arranged above the water pipe in the exchange cavity; A heat conduction plate is arranged transversely in the hydrophobic cavity, the heat conduction plate divides the hydrophobic cavity into a distillation cavity and a heating cavity from top to bottom, the distillation cavity is connected with a condenser through an air outlet pipe; A heating assembly is arranged in the heating cavity; A stirring assembly is arranged in the distillation cavity, a driving assembly is connected with the stirring assembly and the heating assembly respectively, and drives the stirring assembly and the heating assembly to operate respectively.

2. The steam turbine shaft seal steam recovery device according to claim 1, wherein The stirring assembly comprises: A stirring shaft is arranged horizontally in the distillation cavity, the end of the stirring shaft penetrates through the distillation cavity and is connected with the driving assembly, and the stirring shaft rotates alternately in positive and negative directions under the driving of the driving assembly; A plurality of stirring frames are arranged on the stirring shaft and are distributed along the circumferential direction of the stirring shaft; A plurality of stirring plates are corresponding to the plurality of stirring frames, and the two ends of the stirring plate are respectively connected with the rotating shafts on the two sides of the inner wall of the stirring frame.

3. The steam turbine shaft seal steam recovery device according to claim 2, wherein The heating assembly comprises: A heating plate is arranged transversely in the heating cavity, a plurality of through holes are arranged on the heating plate; A first rotating shaft is arranged horizontally in the heating cavity below the heating plate, the first rotating shaft is parallel to the stirring shaft, the end of the first rotating shaft penetrates through the heating cavity and is connected with the driving assembly, the driving assembly drives the first rotating shaft to rotate alternately in positive and negative directions, and a blowing plate is arranged on the first rotating shaft in the heating cavity along the axial direction of the first rotating shaft.

4. The steam turbine shaft seal steam recovery device according to claim 3, wherein The driving assembly comprises: A first connecting rod, the first end of the first connecting rod is connected with the end of the stirring shaft, the first connecting rod swings with the first end of the first connecting rod as the center under the driving of a first driving source; A rack is arranged horizontally and slidably on the saltwater treatment box, the rack is perpendicular to the first rotating shaft, a first long slot hole arranged at the second end of the first connecting rod is slidably connected with a first guide column on the rack, and the rack is engaged with a gear at the end of the first rotating shaft.

5. The steam turbine shaft seal steam recovery device according to claim 4, wherein The first driving source is a hydraulic cylinder, the hydraulic cylinder is arranged on the saltwater treatment box, a second guide column arranged at the end of the piston rod of the hydraulic cylinder is slidably connected with a second long slot hole arranged at the middle of the first connecting rod.

6. The steam turbine shaft seal steam recovery device according to claim 4, wherein A water through hole is arranged on the stirring plate.

7. The steam turbine shaft seal steam recovery device according to claim 1, wherein A gas distribution plate is arranged transversely between the lower end of the heat inlet pipe and the water pipe, a plurality of air holes are arranged on the gas distribution plate, and a jet head is arranged below each air hole.

8. The steam turbine shaft seal steam recovery device according to any one of claims 1-7, wherein A one-way valve is arranged in the drain pipe. The one-way valve is arranged in the drain pipe.

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