CN118793492B - A split low-pressure shaft end self-sealing system - Google Patents
A split low-pressure shaft end self-sealing system Download PDFInfo
- Publication number
- CN118793492B CN118793492B CN202411267072.2A CN202411267072A CN118793492B CN 118793492 B CN118793492 B CN 118793492B CN 202411267072 A CN202411267072 A CN 202411267072A CN 118793492 B CN118793492 B CN 118793492B
- Authority
- CN
- China
- Prior art keywords
- steam
- steam seal
- seal
- rotor
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 238000000605 extraction Methods 0.000 claims description 40
- 210000004907 gland Anatomy 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 13
- 230000001502 supplementing effect Effects 0.000 claims description 7
- 230000002787 reinforcement Effects 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 32
- 239000003570 air Substances 0.000 description 9
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 239000012080 ambient air Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
本发明涉及一种分体式低压轴端自密封系统，包括转子；若干汽封结构，若干汽封结构沿转子轴向设置，汽封结构内侧壁与转子外侧壁之间留有空隙；新增进汽管道，新增进汽管道用于连通外界汽源和空隙，使外界蒸汽进入密封齿内形成汽封幕；每个汽封结构包括若干分离式汽封块，若干分离式汽封块设在转子外侧且组成完整的环形，分离式汽封块内侧壁与转子外侧壁之间留有空隙；汽封套，汽封套设置在分离式汽封块外侧；新增进汽管道设置在分离式汽封块和汽封套上。本发明通过将圆周向分离式汽封块进行分体设计，配合温度传感器和独立供汽阀门进行独立控制，来达到对局部间隙扩大后的蒸汽泄漏抑制，在保证汽轮机工作安全性的同时节省高压蒸汽使用量。
The present invention relates to a split low-pressure shaft end self-sealing system, comprising a rotor; a plurality of steam seal structures, the plurality of steam seal structures are arranged along the axial direction of the rotor, and a gap is left between the inner wall of the steam seal structure and the outer wall of the rotor; a newly added steam inlet pipe, the newly added steam inlet pipe is used to connect the external steam source and the gap, so that the external steam enters the sealing teeth to form a steam seal curtain; each steam seal structure comprises a plurality of separate steam seal blocks, the plurality of separate steam seal blocks are arranged on the outer side of the rotor and form a complete ring shape, and a gap is left between the inner wall of the separate steam seal block and the outer wall of the rotor; a steam seal sleeve, the steam seal sleeve is arranged on the outer side of the separate steam seal block; the newly added steam inlet pipe is arranged on the separate steam seal block and the steam seal sleeve. The present invention achieves the suppression of steam leakage after the local gap is enlarged by splitting the circumferential separate steam seal block, and independently controlling it with a temperature sensor and an independent steam supply valve, so as to save the use of high-pressure steam while ensuring the working safety of the steam turbine.
Description
Technical Field
The invention belongs to the technical field of steam turbine sealing, and particularly relates to a split type low-pressure shaft end self-sealing system.
Background
Along with the promotion of green low-carbon transformation, the generating capacity ratio of non-fossil energy is steadily improved, and the continuous improvement of the share of wind energy, nuclear energy, solar energy and other energy sources shows that the method has positive progress in the aspects of energy structure adjustment and optimization. But nevertheless, thermal energy still has a large weight in energy consumption and power production. Thermal power generation is one of the most traditional global power production modes, uses fossil fuel (such as coal, petroleum or natural gas) as a main energy source, heats water by heat generated by combustion to generate steam, and drives a steam turbine to generate power, and plays an important role in power supply by virtue of the advantages of mature technology, high equipment reliability, low unit power generation cost, strong peak regulation capability, high energy density and the like, but with the increasingly severe environmental problems and climate change, measures are required to be continuously taken to reduce the running loss of the thermal power generation, so that the performance of thermal power generation is further improved.
The steam turbine is one of three main devices in a thermal power plant and consists of a steam generator (boiler), a steam turbine, a rotor, a generator, a condenser, a water supply pump, an adjusting system and the like. The working principle of the steam turbine is based on a thermodynamic cycle process, mainly a Rankine cycle. In the process, steam is heated to a high-temperature and high-pressure state in a boiler, and then is accelerated through a nozzle and guided to turbine blades to push a turbine to rotate, so that heat energy is converted into mechanical energy, and a generator is pushed to generate continuous electric power, so that the rotation efficiency of the turbine directly influences the operation efficiency and economic benefit of the whole unit.
However, when the steam turbine is in operation, the intermediate rotor rotates at a high speed, and the cylinder, the partition plate (or the stationary blade ring) and the like are stationary, so that a proper gap is required between the rotor and the stationary member to prevent mutual friction. However, the existence of gaps can cause steam leakage, and the caused loss accounts for at least forty percent of the total loss of the whole turbine, which not only reduces the efficiency of the unit, but also seriously affects the safe operation of the unit. In addition, because the steam turbine rotor belongs to a long shaft piece, the steam turbine rotor has complex rotor dynamics characteristics, radial runout can occur during high-speed rotation and variable working condition operation, the circumferential sealing gap starts to be uneven over time, leakage is serious at a place with a large sealing gap, and particularly, permeation of noncondensable air can be caused, so that the efficiency of a unit is seriously affected. The traditional method ensures the sealing effect by increasing the pressure of the steam seal and improving the air supply quantity, but the high-pressure sealing steam has excessive loss and poor economical efficiency.
Accordingly, there is a need to design a split low pressure shaft end self-sealing system to address the above-described issues.
Disclosure of Invention
The invention aims to provide a split low-pressure shaft end self-sealing system, which solves the problems, achieves the purposes of inhibiting steam leakage after the expansion of a local clearance, maintaining vacuum degree when a shaft seal system fails and ensuring the working safety of a steam turbine.
In order to achieve the aim, the invention provides a split low-pressure shaft end self-sealing system, which comprises
A rotor;
the steam seal structures are arranged along the axial direction of the rotor, and a gap is reserved between the inner side wall of the steam seal structure and the outer side wall of the rotor;
The new steam inlet pipeline is used for communicating an external steam source with the gap, so that external steam enters the inner sealing teeth to form a steam sealing curtain;
Each steam seal structure comprises a plurality of separated steam seal blocks, the plurality of separated steam seal blocks are sleeved on the outer side of the rotor and form a complete ring shape, and the gap is reserved between the inner side wall of each separated steam seal block and the outer side wall of the rotor;
The vapor seal sleeve is arranged outside the separation type vapor seal block;
the newly-added steam inlet pipeline is arranged on the separated steam seal block and the steam seal sleeve.
Preferably, the new steam inlet pipeline comprises a gland bush hole, a gland block hole and a gland bush pipeline, the gland bush hole and the gland bush pipeline are arranged on the gland bush, the gland block hole is arranged on the separated gland block, and the gland bush hole, the gland block hole and the gland bush pipeline enable external steam to enter the gap to form a gland curtain.
Preferably, the external steam comprises leakage steam and a steam supplementing steam source of the high-pressure cylinder.
Preferably, the split type steam seal block is formed by dividing a complete ring type steam seal block, the split type steam seal block is fan-shaped, and a dividing gap is reserved between two adjacent split type steam seal blocks.
Preferably, the steam jacket pipeline is communicated with a steam branch, a plurality of steam branch valves are arranged on the steam branch, the steam branch pipelines are communicated with steam branch pipes jointly, the steam branch pipes are provided with steam branch valves, the steam branch pipes are communicated with a steam pipeline jointly, a steam main valve is arranged on the steam pipeline, and the steam pipeline is communicated with a high-pressure cylinder leakage steam source and a steam supplementing source.
Preferably, the inner seal teeth comprise a plurality of short teeth groups and a plurality of long teeth which are arranged at intervals, the short teeth groups comprise two short teeth which are arranged at intervals, the outer side wall of the rotor is provided with a plurality of outer convex surfaces and a plurality of inner concave surfaces, the outer convex surfaces are arranged at intervals with the inner concave surfaces, two short teeth of the short teeth groups correspond to the outer convex surfaces, and the long teeth correspond to the inner concave surfaces.
Preferably, the number of the steam seal structures is three, a steam supply chamber is arranged between the steam seal structure close to the inside of the low pressure cylinder and the steam seal structure positioned in the middle, and a steam extraction chamber is arranged between the steam seal structures positioned in the middle and close to the outside environment.
Preferably, the gas between the gas supply chamber and the low pressure cylinder flows from the gas supply chamber to the low pressure cylinder, the gas between the gas supply chamber and the gas extraction chamber flows from the gas supply chamber to the gas extraction chamber, and the gas between the gas extraction chamber and the external environment flows from the external environment to the gas extraction chamber.
Preferably, the gas in the vapor jacket pipeline between the vapor supply chamber and the low pressure cylinder flows from the vapor supply chamber to the low pressure cylinder through the inner sealing teeth, the gas in the vapor jacket pipeline between the vapor supply chamber and the vapor extraction chamber flows from the vapor supply chamber to the vapor extraction chamber through the inner sealing teeth, and the gas between the vapor extraction chamber and the external environment flows from the external environment to the vapor extraction chamber through the inner sealing teeth.
Preferably, a temperature sensor is arranged on one side of the separated steam seal block, which is positioned between the steam supply chamber and the steam extraction chamber and is close to the steam extraction chamber.
Compared with the prior art, the invention has the following advantages and technical effects:
1. According to the invention, the external steam pressure is mainly conveyed into the shaft seal by utilizing the pipeline, holes or strip seams are designed at the tooth ends, so that steam flows form a steam curtain in the cavity in the middle of the sealing teeth, low-pressure steam is prevented from diffusing by utilizing the high-pressure steam curtain, steam walls are formed at the two sides of the shaft seal for supplying steam, non-condensing steam is prevented from entering the low-pressure cylinder through the shaft seal, a deformed rotor is not required to be polished at the low-pressure shaft end of a long-term unrepaired unit, and the influence on the vacuum of the unit caused by air leakage due to abrasion of the shaft seal is reduced.
2. The complete steam seal block is designed in a zoned mode, the complete steam seal block is divided into symmetrical multiple parts, and meanwhile, each way of independent switch is arranged to independently control the steam supply of each part of steam seal block. And a temperature sensor is arranged on the steam seal block, and whether steam leakage is aggravated is judged according to the temperature change in the steam seal block and the cavity.
3. According to the invention, the external steam input of each path can be adjusted through the control valve, the controllability of the steam curtain in the steam seal body is realized, the situation that the local leakage is increased due to the increase of the clearance between the sealing teeth and one side of the rotor when the rotor eccentrically rotates can be dealt with, the important reinforcement of the serious part of steam leakage is realized, the vacuum of the system is ensured, the overhaul and overhaul cost of the low-pressure cylinder of the power plant caused by the leakage of the shaft seal is greatly reduced, and the economy of the unit is improved.
4. The newly added external steam is independent of the original main pipe steam supply, in normal operation, because the newly added steam supply pipeline supplements steam, a safer and more reliable self-sealing system of the low-pressure shaft end is established, the high-efficiency sealing performance of the low-pressure shaft seal of the steam turbine is ensured, when the original shaft seal steam supply suddenly fails, the steam supply can serve as an emergency measure, the steam supply pressure is improved, steam leakage and external noncondensable gas are restrained from entering the low-pressure cylinder, the vacuum of the unit is not reduced, the sudden shutdown danger caused by the steam supply is avoided, and the running stability of the unit is improved.
Drawings
For a clearer description of an embodiment of the invention or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic structural diagram of a vapor seal according to the present invention;
FIG. 3 is a front view of the vapor seal structure of the present invention;
FIG. 4 shows the present invention a cross-sectional view of the vapor seal structure;
FIG. 5 is a cross-sectional view of a split steam seal block of the present invention;
FIG. 6 is a circuit control diagram of the present invention;
fig. 7 is an exploded view of the rotor and the split steam block of the present invention.
Wherein, 1, a rotor; 2, a separating steam seal block, 3, a steam seal sleeve, 4, a dividing gap, 5, a steam seal sleeve hole, 6, a steam seal block hole, 7, a low-pressure cylinder wall, 8, a steam supply chamber, 9, a steam extraction chamber, 10, a steam seal sleeve pipeline, 11, a temperature sensor, 13, a bolt, 14, an inner sealing tooth, 15, a steam pipeline, 16, a steam main valve, 17, a steam branch pipe, 18, a steam branch valve, 19, a steam branch pipe, 20 and a steam branch valve.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to FIGS. 1-7, the present invention provides a split low pressure shaft end self-sealing system comprising
A rotor 1;
The steam seal structures are axially arranged along the rotor 1, and gaps are reserved between the inner side walls of the steam seal structures and the outer side walls of the rotor 1;
The new steam inlet pipeline is used for communicating an external steam source and the gap, so that external steam enters the inner sealing teeth 14 to form a steam sealing curtain;
each steam seal structure comprises a plurality of separated steam seal blocks 2, the plurality of separated steam seal blocks 2 are sleeved on the outer side of the rotor 1 and form a complete ring shape, and a gap is reserved between the inner side wall of the separated steam seal blocks 2 and the outer side wall of the rotor 1;
The steam jacket 3 is arranged outside the separation type steam jacket block 2;
The newly added steam inlet pipeline is arranged on the separated steam seal block 2 and the steam seal sleeve 3.
Further optimizing scheme, the newly-added steam inlet pipeline comprises a steam seal sleeve hole 5, a steam seal block hole 6 and a steam seal sleeve pipeline 10, wherein the steam seal sleeve hole 5 and the steam seal sleeve pipeline 10 are arranged on the steam seal sleeve 3, the steam seal block hole 6 is arranged on the separated steam seal block 2, and the steam seal sleeve hole 5, the steam seal block hole 6 and the steam seal sleeve pipeline 10 enable external steam to enter the gap to form a steam seal curtain.
According to the further optimization scheme, the external steam comprises leakage steam and a steam supplementing steam source of the high-pressure cylinder.
Further optimizing scheme, the split type steam seal block 2 is formed by dividing a complete ring-shaped steam seal block, the split type steam seal block 2 is fan-shaped, and a dividing gap 4 is reserved between two adjacent split type steam seal blocks 2.
Further optimizing scheme, the steam jacket pipeline 10 is communicated with a steam branch 19, a steam branch valve 20 is arranged on the steam branch 19, a plurality of steam branches 19 are jointly communicated with a steam branch pipe 17, a steam branch valve 18 is arranged on the steam branch pipe 17, a plurality of steam branch pipes 17 are jointly communicated with a steam pipeline 15, a steam main valve 16 is arranged on the steam pipeline 15, and the steam pipeline 15 is communicated with a high-pressure cylinder leakage steam and a steam supplementing steam source.
The steam pipeline 15 and the steam branch pipe 17 can be connected by adopting a T-shaped three-way interface to form a one-to-two pipeline. The steam branch pipe 17 and the steam branch pipe 19 can be connected by adopting a cross type four-way interface and a T-shaped three-way interface to form a one-to-four pipeline. The concrete connection mode can adopt threaded connection, and flange connection is adopted when the diameter is larger.
Further optimizing scheme, interior seal tooth 14 includes a plurality of short tooth groups and a plurality of long tooth that the interval set up, and short tooth group includes the short tooth that two intervals set up, and rotor 1 lateral wall is provided with a plurality of outer convex surfaces and a plurality of interior concave surfaces, and outer convex surface and interior concave surface interval set up, and two short teeth of short tooth group correspond with outer convex surface, and long tooth corresponds with interior concave surface.
According to the further optimization scheme, the number of the steam seal structures is three, a steam supply chamber 8 is arranged between the steam seal structure close to the inside of the low-pressure cylinder and the steam seal structure located in the middle, and a steam extraction chamber 9 is arranged between the steam seal structures located in the middle and close to the steam seal structure in the external environment.
In the invention, only one vapor seal structure is arranged between the inside of the low pressure cylinder and the vapor supply chamber 8, between the vapor supply chamber 8 and the vapor extraction chamber 9 and between the vapor extraction chamber 9 and the external environment, and two or more vapor seal structures can be arranged between the vapor seal structures according to actual needs.
In a further optimized scheme, the gas between the gas supply chamber 8 and the low-pressure cylinder flows from the gas supply chamber 8 to the low-pressure cylinder, the gas between the gas supply chamber 8 and the gas extraction chamber 9 flows from the gas supply chamber 8 to the gas extraction chamber 9, and the gas between the gas extraction chamber 9 and the external environment flows from the external environment to the gas extraction chamber 9.
In a further optimized scheme, the gas in the vapor sleeve pipeline 10 between the vapor supply chamber 8 and the low-pressure cylinder flows to the low-pressure cylinder from the vapor supply chamber 8 through the inner sealing teeth 14, the gas in the vapor sleeve pipeline 10 between the vapor supply chamber 8 and the vapor extraction chamber 9 flows to the vapor extraction chamber 9 from the vapor supply chamber 8 through the inner sealing teeth 14, and the gas between the vapor extraction chamber 9 and the external environment flows to the vapor extraction chamber 9 from the external environment through the inner sealing teeth 14.
In a further optimization scheme, a temperature sensor 11 is arranged on one side, close to the steam extraction chamber 9, of the separation type steam seal block 2 between the steam supply chamber 8 and the steam extraction chamber 9.
According to the invention, each stage of steam seal structure is divided into 4 separated steam seal blocks 2, the rotor 1 sequentially names the separated steam seal blocks 2 as 1 stage of separated steam seal blocks 2, 2 stage of separated steam seal blocks 2 and 3 stage of separated steam seal blocks 2 from a low-pressure cylinder to the outside, each 2 stage of separated steam seal block 2 is correspondingly provided with a temperature sensor 11, the temperature sensor 11 is positioned on one side of the separated steam seal block 2 close to the steam extraction chamber 9, and the temperatures of the flowing steam and the separated steam seal blocks 2 are monitored in real time through the temperature sensor 11.
The shaft seal air supply main pipe collects the steam leaked from the high-pressure end and conveys the steam to the steam supply chamber 8 of the shaft seal system positioned between the low-pressure cylinder and the external environment through a pipeline, and the pressure in the steam supply chamber 8 is higher than the atmospheric pressure by 0.03Mpa. The low pressure cylinder is connected with a condenser of the steam turbine, the interior of the low pressure cylinder is in a vacuum environment, the steam extraction chamber 9 is connected with a shaft seal heater, the shaft seal heater is used for absorbing steam in a shaft seal system, recovering heat, improving the heat efficiency of the system and enabling micro vacuum to be formed in the steam extraction chamber 9. Therefore, after the steam in the steam supply chamber 8 enters, the steam flows into the low-pressure cylinder on one hand, the steam leakage of the low-pressure cylinder is restrained, and on the other hand, the steam flows into the steam extraction chamber 9, and the steam is recycled. The steam-pumping chamber 9 absorbs gas from both sides due to the characteristic of micro vacuum, so that steam leakage of the steam-supplying chamber 8 to the ambient air can be avoided. The newly added steam source is from the leakage steam of the high-pressure cylinder or other steam supplementing steam sources, enters the steam branch pipe 17 through the steam pipeline 15, enters the steam branch pipe 19 through the steam branch pipe 17, the steam jacket 3 above the separated steam seal block 2 is opened to penetrate through the steam jacket pipeline 10, the steam branch pipe 19 and the steam jacket pipeline 10 are connected through bolts, and then newly added steam enters the separated steam seal block 2 through the steam jacket pipeline 10. The split gland bush 2 is integrally fixed to the gland bush 3 by a groove and to the low pressure cylinder wall 7 by bolts 13.
The annular separation type steam seal block 2 is subjected to separation treatment and is divided into a plurality of parts. The cavity between the split steam block 2 and the rotor 1 can be divided into a plurality of parts according to the divided split steam block 2. The envelope 3 above each separate gland block 2 opens through an envelope conduit 10, with the envelope conduit 10 delivering external vapour pressure to the cavity between the inner seal teeth 14 of the separate gland block 2 and the rotor 1. Through set up 3 vapor lock piece holes 6 in every disconnect-type vapor lock piece 2, make the inside spout of disconnect-type vapor lock piece 2 send out curtain form the vapor current of certain speed and certain thickness and let the vapor current of blowout form stronger vapor current barrier, block outside noncondensable gas and get into the low pressure jar inside.
The vapor line 15 is arranged with a spatial position outside the low-pressure cylinder and a vapor main valve 16 is provided thereon. Due to the multistage arrangement of the split steam block 2 in the shaft seal system, a steam branch pipe 17 is arranged on the steam pipeline 15. The steam pipeline 15 adopts a steam main valve 16 to take charge of a main gas path. The steam main valve 16 is divided into two parts from the rear end and is divided into two steam branch pipes 17, and the control is carried out on the 1-part type steam seal block 2 and the 2-part type steam seal block 2. The steam branch valve 18 adopts a proportional electric control valve to ensure that the air inflow of the steam branch pipe 17 is adjustable in real time according to working conditions. The rear section of each steam branch pipe 17 is provided with a plurality of steam branch valves 20 for the split steam seal blocks 2, and the steam branch valves can be controlled independently for the split steam seal blocks 2.
Meanwhile, due to the fact that the shafting is operated for many years, sedimentation and eccentricity are caused, single-side air leakage is serious. Leakage tends to cause ingress of ambient air at low temperature, cooling the split gland block 2. The edge position of the 2-stage separation type steam seal block 2 is inserted into and fixed with a temperature sensor 11 in a punching mode, and the temperature of the sealing position is detected. When the temperature is abnormal, after the leakage is indicated, the leakage position and the adjacent split type split steam seal block 2 can be regulated and controlled, the steam branch valve 20 connected with the leakage position can be controlled, the steam flow and the pressure are increased, and the sealing effect is ensured. The design can independently and accurately control the steam valve on the separation type steam seal block 2, so that the separation type steam seal block can not only detect leakage points, but also accurately convey steam to prevent non-condensing steam.
The invention introduces the source and the arrangement quantity of external new steam pipelines to be unfixed, can be the same as the source of the original shaft seal air supply main pipe, and can also be used for supplementing steam from a high-pressure cylinder or other positions, the position and the quantity of the steam seal block holes 6 on the separated steam seal block 2 are unfixed, the steam seal block holes 6 on the separated steam seal block 2 are used for providing an entering channel for additional steam, the form and the quantity of the separated steam seal block are unfixed, the separated design of the separated steam seal block 2 is used for better inhibiting the steam leakage caused by the increase of a circumference to a certain partial gap, and the invention is not limited to the specific division of a plurality of separated steam seal blocks, and the invention mainly refers to the application field of sealing the low-pressure shaft end of a steam turbine, but other sealing conditions needing a rotor and a stator are also applicable.
The invention divides the whole circumference split type steam seal block into the independent control multi-part split type steam seal blocks 2, and the steam seal block holes 6 are arranged on each split type steam seal block 2, and the annular steam curtain is realized in the cavity of the inner sealing teeth 14 in the split type steam seal block 2 by introducing external air supply, so that the high-pressure steam curtain is utilized to prevent low-pressure steam from diffusing, and steam walls are formed at two sides, thereby avoiding non-condensing steam from entering the low-pressure cylinder through the shaft seal. Due to the eccentric rotation of the rotor 1, the gap between the separation type steam seal block 2 and the rotor 1 is increased, and steam leakage is easily caused. The temperature sensor 11 is arranged on the split type steam seal block 2 to monitor and judge whether the steam leakage is aggravated in real time, and the split type steam seal block 2 is independently controlled by adjusting external air supply through a steam valve on a pipeline, so that important reinforcement on serious parts of the steam leakage is realized, and the stability of the vacuum degree in the low-pressure cylinder is ensured.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A split low-pressure shaft end self-sealing system is characterized by comprising
A rotor (1);
the steam seal structures are axially arranged along the rotor (1), and gaps are reserved between the inner side walls of the steam seal structures and the outer side walls of the rotor (1);
the new steam inlet pipeline is used for communicating an external steam source with the gap, so that external steam enters the inner sealing teeth (14) to form a steam sealing curtain;
Each steam seal structure comprises a plurality of separated steam seal blocks (2), the plurality of separated steam seal blocks (2) are sleeved on the outer side of the rotor (1) and form a complete ring shape, and the gap is reserved between the inner side wall of the separated steam seal blocks (2) and the outer side wall of the rotor (1);
a gland bush (3), wherein the gland bush (3) is arranged outside the separation type gland block (2);
The new steam inlet pipeline is arranged on the separated steam seal block (2) and the steam seal sleeve (3);
The new steam inlet pipeline comprises a steam seal sleeve hole (5), a steam seal block hole (6) and a steam seal sleeve pipeline (10), wherein the steam seal sleeve hole (5) and the steam seal sleeve pipeline (10) are arranged on the steam seal sleeve (3), the steam seal block hole (6) is arranged on the separated steam seal block (2), and the steam seal sleeve hole (5), the steam seal block hole (6) and the steam seal sleeve pipeline (10) enable external steam to enter the gap to form a steam seal curtain;
The separation type steam seal block (2) is formed by dividing a complete annular steam seal block, the separation type steam seal block (2) is fan-shaped, and a division gap (4) is reserved between two adjacent separation type steam seal blocks (2);
The number of the steam seal structures is three, a steam supply chamber (8) is arranged between the steam seal structure close to the inside of the low pressure cylinder and the steam seal structure positioned in the middle, and a steam extraction chamber (9) is arranged between the steam seal structure close to the external environment and the steam seal structure positioned in the middle;
a temperature sensor (11) is arranged on one side, close to the steam extraction chamber (9), of the separated steam seal block (2) between the steam supply chamber (8) and the steam extraction chamber (9);
Because the eccentric rotation of rotor (1) leads to disconnect-type vapor lock piece (2) and rotor (1) clearance increase, leads to steam leakage, sets up temperature sensor (11) real-time supervision on disconnect-type vapor lock piece (2) and judges whether steam leakage aggravates to adjust outside air feed through the steam valve on the pipeline and realize separate control to disconnect-type vapor lock piece (2), accomplish the reinforcement to steam leakage aggravation part, guarantee that the inside vacuum of low pressure jar is stable.
2. The split low pressure shaft end self-sealing system of claim 1 wherein said ambient steam comprises high pressure cylinder leakage steam and make-up steam source.
3. The split low-pressure shaft end self-sealing system according to claim 2, wherein the steam jacket pipeline (10) is communicated with a steam branch pipeline (19), a plurality of steam branch pipelines (17) are communicated with each other through a steam branch valve (20) arranged on the steam branch pipeline (19), a plurality of steam branch pipelines (17) are communicated with each other through a steam branch valve (18) arranged on the steam branch pipeline (17), a plurality of steam branch pipelines (17) are communicated with each other through a steam pipeline (15), a steam main valve (16) is arranged on the steam pipeline (15), and the steam pipelines (15) are communicated with a high-pressure cylinder leakage steam source and a steam supplementing source.
4. A split low pressure shaft end self-sealing system according to claim 1, wherein said inner sealing teeth (14) comprise a plurality of short teeth groups and a plurality of long teeth arranged at intervals, said short teeth groups comprise two short teeth arranged at intervals, said rotor (1) outer side wall is provided with a plurality of outer convex surfaces and a plurality of inner concave surfaces, said outer convex surfaces are arranged at intervals with said inner concave surfaces, two short teeth of said short teeth groups correspond to said outer convex surfaces, and said long teeth correspond to said inner concave surfaces.
5. A split low pressure shaft end self-sealing system according to claim 1, characterized in that the gas between the gas supply chamber (8) and the low pressure cylinder flows from the gas supply chamber (8) to the low pressure cylinder, the gas between the gas supply chamber (8) and the gas extraction chamber (9) flows from the gas supply chamber (8) to the gas extraction chamber (9), and the gas between the gas extraction chamber (9) and the external environment flows from the external environment to the gas extraction chamber (9).
6. A split low pressure shaft end self-sealing system according to claim 1, characterized in that the gas in the gland bush pipe (10) between the gas supply chamber (8) and the low pressure cylinder flows from the gas supply chamber (8) to the low pressure cylinder through the inner sealing teeth (14), the gas in the gland bush pipe (10) between the gas supply chamber (8) and the gas extraction chamber (9) flows from the gas supply chamber (8) to the gas extraction chamber (9) through the inner sealing teeth (14), and the gas between the gas extraction chamber (9) and the external environment flows from the external environment to the gas extraction chamber (9) through the inner sealing teeth (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411267072.2A CN118793492B (en) | 2024-09-11 | 2024-09-11 | A split low-pressure shaft end self-sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411267072.2A CN118793492B (en) | 2024-09-11 | 2024-09-11 | A split low-pressure shaft end self-sealing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118793492A CN118793492A (en) | 2024-10-18 |
| CN118793492B true CN118793492B (en) | 2025-01-14 |
Family
ID=93023765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411267072.2A Active CN118793492B (en) | 2024-09-11 | 2024-09-11 | A split low-pressure shaft end self-sealing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118793492B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074552A (en) * | 2014-06-26 | 2014-10-01 | 江苏金通灵流体机械科技股份有限公司 | System and method for cooling high-temperature steam turbine rotor by gland seal |
| CN204572076U (en) * | 2015-04-30 | 2015-08-19 | 秦皇岛华宇通电力科技有限公司 | Floating type side tooth packing |
| CN207194961U (en) * | 2017-09-11 | 2018-04-06 | 广东大唐国际潮州发电有限责任公司 | A kind of turbine shaft seal steam temperature control system |
| CN210178423U (en) * | 2019-04-17 | 2020-03-24 | 华电电力科学研究院有限公司 | Self-sealing gland seal of steam turbine |
| CN113863994A (en) * | 2021-10-12 | 2021-12-31 | 华能(大连)热电有限责任公司 | A steam sealer with high sealing performance and its assembling method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202370592U (en) * | 2011-12-20 | 2012-08-08 | 范宏财 | Scale type arrangement steam seal belt for steam turbine and steam seal device for steam turbine |
| CN112696236B (en) * | 2020-11-10 | 2025-01-10 | 苏州西热节能环保技术有限公司 | A sealing structure based on circumferential relative speed |
| CN218816544U (en) * | 2022-12-20 | 2023-04-07 | 北京京桥热电有限责任公司 | Shaft seal system for reducing temperature of shaft seal by adjusting clearance between moving blade and static blade |
-
2024
- 2024-09-11 CN CN202411267072.2A patent/CN118793492B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104074552A (en) * | 2014-06-26 | 2014-10-01 | 江苏金通灵流体机械科技股份有限公司 | System and method for cooling high-temperature steam turbine rotor by gland seal |
| CN204572076U (en) * | 2015-04-30 | 2015-08-19 | 秦皇岛华宇通电力科技有限公司 | Floating type side tooth packing |
| CN207194961U (en) * | 2017-09-11 | 2018-04-06 | 广东大唐国际潮州发电有限责任公司 | A kind of turbine shaft seal steam temperature control system |
| CN210178423U (en) * | 2019-04-17 | 2020-03-24 | 华电电力科学研究院有限公司 | Self-sealing gland seal of steam turbine |
| CN113863994A (en) * | 2021-10-12 | 2021-12-31 | 华能(大连)热电有限责任公司 | A steam sealer with high sealing performance and its assembling method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN118793492A (en) | 2024-10-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105673101B (en) | A kind of steam turbine and therrmodynamic system with depth peak regulating function | |
| CN107664045B (en) | A high-temperature gas-cooled reactor steam turbine seal steam supply system and method | |
| CN108397247B (en) | Quick-assembly high-speed coaxial intermediate reheat axial exhaust steam turbine | |
| CN113833534B (en) | Supercritical carbon dioxide turbine shaft seal air supply and air leakage recovery system and method | |
| CN104533550B (en) | The Double reheat steam turbine ultra-high pressure cylinder that all feedwater backheat is drawn gas can be provided | |
| CN209800100U (en) | sealing system for reducing oil leakage | |
| CN104948235A (en) | Super-high pressure impulsion type steam turbine | |
| CN105804802A (en) | 350 MW supercritical double-cylinder and double-exhaust steam turbine | |
| CN103670550A (en) | Ultra-supercritical secondary re-heating steam turbine set | |
| CN102042041A (en) | System and method for cooling steam turbine rotors | |
| CN205445699U (en) | Steam turbine with degree of depth peak regulation function | |
| CN203835469U (en) | Turbine low-pressure shaft seal steam supply system | |
| CN118793492B (en) | A split low-pressure shaft end self-sealing system | |
| CN202370596U (en) | Heating heat supply combined heat and power generation power generator set | |
| CN220267794U (en) | Wide load peak regulation system is reformed transform to flexibility of steam turbine bypass steam supply | |
| CN206129323U (en) | A twin -screw expander for low temperature waste heat recovery system | |
| CN208089359U (en) | A kind of coaxial resuperheat axial exhaust type steam turbine of ready-package high speed | |
| CN206860244U (en) | A kind of back pressure turbine of extraction-condensing steam turbine transformation | |
| CN204827540U (en) | Superhigh pressure impact steam turbine | |
| CN200993028Y (en) | Steam turbine low-pressure shaft seal water-sealing system | |
| Zhiyun et al. | Experimental study on regulation characteristics of intermediate pressure cylinder regulating valves of heat supply steam turbine under peak regulating mechanism | |
| CN106121740B (en) | A kind of shaft seal steam supply system | |
| CN113483320A (en) | Ash water low flash steam recycling system | |
| CN205089534U (en) | Solar photo -thermal power generation system | |
| CN205605253U (en) | Overcritical double -cylinder double flow steam turbine of 350MW |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |