CN200993028Y - Steam turbine low-pressure shaft seal water-sealing system - Google Patents
Steam turbine low-pressure shaft seal water-sealing system Download PDFInfo
- Publication number
- CN200993028Y CN200993028Y CN 200620161976 CN200620161976U CN200993028Y CN 200993028 Y CN200993028 Y CN 200993028Y CN 200620161976 CN200620161976 CN 200620161976 CN 200620161976 U CN200620161976 U CN 200620161976U CN 200993028 Y CN200993028 Y CN 200993028Y
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- water
- steam
- steam turbine
- low pressure
- pressure shaft
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Abstract
The utility model relates to a water sealing system for low pressure shaft envelop of steam turbine, which belongs to the sealing technology of shaft envelop of steam turbine and comprises structurally a common steam condenser and a condensing pump. Steam inlet of the condenser is connected with steam vent of the steam turbine so as to coagulate steam exhausted by the steam turbine into water. Water outlet of the steam condenser is connected with the condensing pump which can extract the water coagulated in the steam condenser to boiler. The utility model is creative in that low pressure shaft envelop of the steam turbine is provided with a water sealing chamber and a water return chamber which are connected with each other, and the water outlet of the condensing pump is connected with the water inlet of the water sealing chamber so as to distribute water to the water sealing chamber. Water leaked from the water sealing chamber enters the water return chamber and water collector. Water outlet of the water collector is connected in series with water disperser and the steam condenser in order to form circulating water seal system. The low pressure shaft envelop of the utility model can save energy, reduce temperature of rotator of the low pressure shaft envelop, improve service life of the steam turbine and adapt to condensing steam turbines of all types.
Description
(1) technical field
The utility model relates to a kind of sealing technique of turbine shaft seal, specifically a kind of steam turbine low pressure shaft seal water-sealing system.
(2) technical background
Thermal Power Station's condensing steam turbine high low pressure end shaft gland steam leakage is greatly the ubiquitous problem of steam turbine.The condensing steam turbine high low pressure end axis of prior art seal up for safekeeping common issue be: all mainly adopt leakoff-type shaft seal, because leakoff-type shaft seal is a clearance seal, steam leaks the generating steam consumption that has increased steam turbine from the gap, the gas of shaft sealing leakage enters oil system and makes the steam turbine oil mixed with water, the steam turbine oil emulsion deterioration forms potential safety hazard.
Condensing steam turbine low voltage terminal axle envelope adopts steam tight also to have following problem:
1) steam tight causes very big energy waste, and the generating of can not doing work of a large amount of sealed steams is inhaled into vapour condenser and condenses into water;
2) steam enters vapour condenser and has reduced vapour condenser efficient, steam turbine drains into the steam temperature of vapour condenser about 50 degree, and make an envelope place cylinder temperature too high and make cylinder generation thermal distortion about sealed steam 300 degree, elevated-temperature seal steam raises temperature of rotor, it is bloated poor to have increased rotor, has reduced rotor rigidity;
3) because rotor transmission of heat raises the low voltage terminal bearing bush temperature;
4) because the sealed steam temperature is higher relatively, the axle envelope can only make the sealing steam consumption big with the leakoff-type shaft seal clearance seal of metallic material manufacturing;
5) if feed the steam flow deficiency of low voltage terminal axle envelope, then sealing effect is bad, and air can enter vapour condenser reduces condenser vacuum; Sealing vapour amount is excessive, and then steam can leak into outside the steam turbine, and steam enters oil system and makes the steam turbine oil mixed with water.
(3) summary of the invention
Technical assignment of the present utility model is at the deficiencies in the prior art, and a kind of steam turbine low pressure shaft seal water-sealing system that replaces steam packing with water-stop is provided.
The technological scheme that its technical problem that solves the utility model adopts is:
Steam turbine low pressure shaft seal water-sealing system, comprise vapour condenser and condensate pump, thereby the steam discharge that the steam inlet of vapour condenser links to each other with the steam-expelling port of steam turbine steam turbine condenses into water, the water outlet of the vapour condenser water that will condense in the vapour condenser that is connected with condensate pump pumps into boiler, its innovative point is that the steam turbine low pressure shaft seal place is provided with interconnective water-stop chamber and backwater room, thereby the water outlet of condensate pump also joins moisture stream feedwater closed chamber with the water intake of water-stop chamber, the water that leaks from the water-stop chamber enters backwater room and imports water-collecting machine through backwater room, join with vapour condenser again after the water outlet serial connection STEAM TRAP of water-collecting machine, thereby form the water-stop circulatory system.
Above-mentioned steam turbine low pressure shaft seal water-sealing system also is provided with pressure governor between its condensate pump and the water-stop chamber.Water consumption according to the water-stop chamber is regulated the inflow size.
Above-mentioned steam turbine low pressure shaft seal water-sealing system also is provided with accumulator between its condensate pump and the water-stop chamber.Its effect one is the water dispenser of use as multi-cylinder turbine water-stop chamber, the 2nd, as protection equipment, promptly break down maybe need overhaul the time closed chamber that feeds water that supplies water, the normal operation of assurance water-stop when condensate pump.
Above-mentioned steam turbine low pressure shaft seal water-sealing system also is provided with viewing window on the water return pipeline between its backwater room and the water-collecting machine.Can observe at any time from backwater room and import the water yield in the water-collecting machine, so that whether decision regulates pressure governor.
Above-mentioned steam turbine low pressure shaft seal water-sealing system also is provided with anticorrosion cover on its turbine rotor.Purpose is to prevent the aqueous corrosion turbine rotor.
Above-mentioned steam turbine low pressure shaft seal water-sealing system also is provided with water-ring on its turbine rotor.Purpose is further to stop water to flow in the steam turbine.
A kind of steam turbine low pressure shaft seal water-sealing system of the present utility model compared with prior art, the beneficial effect that is produced is:
1) directly drains to vapour condenser because low pressure shaft seal, seals water in the rear end of steam turbine, do not cause water slug and can not enter steam turbine;
2) sealing water is supplied with the condensate pump outlet, and the water temperature of condensing and exhaust temperature are approaching, can not cause cylinder, rotor thermal expansion;
3) low pressure shaft seal place temperature of rotor is approaching with the oil temperature, and bearing bush temperature is not responded by rotor;
4) sealing material can select for use nonmetallic material such as Expanded graphite, PVF and rotor not to have gap contact seal, has reduced sealing water;
5) save a large amount of sealed steams, reduced cost of electricity-generating, improved generating efficiency.
6) make water-stop into after because temperature reduces, so can adopt material such as the better PVF of sealing effect to seal.
(4) description of drawings
Accompanying drawing 1 is a theory structure block diagram of the present utility model;
Accompanying drawing 2 is the water-sealing system structural representation of single casing steam turbine of the present utility model;
Accompanying drawing 3 is the water-sealing system structural representation of multi-cylinder turbine of the present utility model.
Among the figure, 1, vapour condenser, 2. condensate pump, 3, pressure governor, 4, accumulator, 5, the water-stop chamber, 6, backwater room, 7, water-collecting machine, 8, STEAM TRAP, 9, viewing window, 10, anticorrosion cover, 11, water-ring, 12, steam turbine, 13, steam turbine, 14, steam turbine, 15, the water-stop chamber, 16, water-stop chamber, 17, backwater room, 18, backwater room.
(5) embodiment
Below in conjunction with explaining below 1,2,3 pairs of steam turbine low pressure shaft seal water-sealing systems works of the present utility model of accompanying drawing.
As shown in Figure 1, steam turbine low pressure shaft seal water-sealing system of the present utility model, its structure comprises vapour condenser 1, condensate pump 2, pressure governor 3, accumulator 4, water-stop chamber 5, backwater room 6, water-collecting machine 7 and STEAM TRAP 8, thereby the steam discharge that the steam inlet of vapour condenser 1 links to each other with the steam-expelling port of steam turbine 12 steam turbine 12 condenses into water, the water outlet of vapour condenser 1 water that will condense in the vapour condenser 1 that is connected with condensate pump 2 pumps into boiler, boiler reburns into the water that condenses into steam and steam is sent into steam turbine 12 actings, the above-mentioned circulatory system is the vapour of prior art, water circulation system, innovative point are at above-mentioned vapour, add a usefulness water of condensation on the basis of water circulation system again and done the circulatory system that seals water cycle.The circulation process of its system is as follows:
One cover interconnective water-stop chamber 5 and backwater room 6 is set at the low pressure shaft seal place of single casing steam turbine 12, thereby the water intake of the water outlet of condensate pump 2 and water-stop chamber 5 joins moisture stream feedwater closed chamber 5,5 water that leak enter backwater room 6 and import water-collecting machine 7 through backwater room 6 from the water-stop chamber, join with vapour condenser 1 again after the water outlet serial connection STEAM TRAP 8 of water-collecting machine 7, thereby form the sealing water circulation system.
Also be provided with pressure governor 3 and accumulator 4 between above-mentioned condensate pump 2 and the water-stop chamber 5.
Also be provided with viewing window 9 on the water return pipeline between above-mentioned backwater room 6 and the water-collecting machine 7.
Also be provided with anticorrosion cover 10 on the above-mentioned turbine rotor.
Also be provided with water-ring 11 on the above-mentioned turbine rotor.
As shown in Figure 2, steam turbine low pressure shaft seal water-sealing system of the present utility model, its structure comprises vapour condenser 1, condensate pump 2, pressure governor 3, accumulator 4, water-stop chamber 5, backwater room 6, water-collecting machine 7 and STEAM TRAP 8, thereby the steam discharge that the steam inlet of vapour condenser 1 links to each other with the steam-expelling port of steam turbine 12 steam turbine 12 condenses into water, the water outlet of vapour condenser 1 water that will condense in the vapour condenser 1 that is connected with condensate pump 2 pumps into boiler, boiler reburns into the water that condenses into steam and steam is sent into steam turbine 12 actings, the above-mentioned circulatory system is the vapour of prior art, water circulation system, innovative point are at above-mentioned vapour, add a usefulness water of condensation on the basis of water circulation system again and done the circulatory system that seals water cycle.The circulation process of its system is as follows:
One cover interconnective water- stop chamber 5,15,16 and backwater room 6,17,18 is set at the low pressure shaft seal place of multi-cylinder turbine 12,13,14 respectively, thereby the water outlet of condensate pump 2 joins moisture stream feedwater closed chamber 5,15,16 with the water intake of water- stop chamber 5,15,16 respectively, 5,15,16 water that leak enter backwater room 6,17,18 respectively and import water-collecting machines 7 jointly through backwater room 6,17,18 from the water-stop chamber, join with vapour condenser 1 again after the water outlet serial connection STEAM TRAP 8 of water-collecting machine 7, thereby form the sealing water circulation system.
Also be provided with pressure governor 3 and accumulator 4 between above-mentioned condensate pump 2 and the water- stop chamber 5,15,16.
Also be provided with viewing window 9 on the water return pipeline between above-mentioned backwater room 6,17,18 and the water-collecting machine 7.
Also be provided with anticorrosion cover 10 on the above-mentioned turbine rotor.
Also be provided with water-ring 11 on the above-mentioned turbine rotor.
Claims (6)
1, steam turbine low pressure shaft seal water-sealing system, comprise vapour condenser and condensate pump, thereby the steam discharge that the steam inlet of vapour condenser links to each other with the steam-expelling port of steam turbine steam turbine condenses into water, the water outlet of the vapour condenser water that will condense in the vapour condenser that is connected with condensate pump pumps into boiler, it is characterized in that, the steam turbine low pressure shaft seal place is provided with interconnective water-stop chamber and backwater room, thereby the water outlet of condensate pump also joins moisture stream feedwater closed chamber with the water intake of water-stop chamber, the water that leaks from the water-stop chamber enters backwater room and imports water-collecting machine through backwater room, join with vapour condenser again after the water outlet serial connection STEAM TRAP of water-collecting machine, thereby form the water-stop circulatory system.
2, steam turbine low pressure shaft seal water-sealing system according to claim 1 is characterized in that, also is provided with pressure governor between condensate pump and the water-stop chamber.
3, steam turbine low pressure shaft seal water-sealing system according to claim 1 is characterized in that, also is provided with accumulator between condensate pump and the water-stop chamber.
4, according to claim 1,2 or 3 described steam turbine low pressure shaft seal water-sealing systems, it is characterized in that, also be provided with viewing window on the water return pipeline between backwater room and the water-collecting machine.
5, according to claim 1,2 or 3 described steam turbine low pressure shaft seal water-sealing systems, it is characterized in that, also be provided with anticorrosion cover on the turbine rotor.
6, according to claim 1,2 or 3 described steam turbine low pressure shaft seal water-sealing systems, it is characterized in that, also be provided with water-ring on the turbine rotor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620161976 CN200993028Y (en) | 2006-12-30 | 2006-12-30 | Steam turbine low-pressure shaft seal water-sealing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620161976 CN200993028Y (en) | 2006-12-30 | 2006-12-30 | Steam turbine low-pressure shaft seal water-sealing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200993028Y true CN200993028Y (en) | 2007-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620161976 Expired - Fee Related CN200993028Y (en) | 2006-12-30 | 2006-12-30 | Steam turbine low-pressure shaft seal water-sealing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845973A (en) * | 2010-04-30 | 2010-09-29 | 中广核工程有限公司 | Vertical pipe drainage system for turbine condenser |
| CN104018890A (en) * | 2014-06-05 | 2014-09-03 | 中国电力工程顾问集团东北电力设计院 | Turbine low pressure cylinder end shaft seal steam supply system |
| CN105508312A (en) * | 2014-09-25 | 2016-04-20 | 天津西澳维密封技术发展有限公司 | Mechanical seal auxiliary system |
-
2006
- 2006-12-30 CN CN 200620161976 patent/CN200993028Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101845973A (en) * | 2010-04-30 | 2010-09-29 | 中广核工程有限公司 | Vertical pipe drainage system for turbine condenser |
| CN101845973B (en) * | 2010-04-30 | 2012-08-15 | 中广核工程有限公司 | Vertical pipe drainage system for turbine condenser |
| CN104018890A (en) * | 2014-06-05 | 2014-09-03 | 中国电力工程顾问集团东北电力设计院 | Turbine low pressure cylinder end shaft seal steam supply system |
| CN105508312A (en) * | 2014-09-25 | 2016-04-20 | 天津西澳维密封技术发展有限公司 | Mechanical seal auxiliary system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |