CN208122896U - A kind of shaft seal steam supply system for double reheat power generation sets - Google Patents
A kind of shaft seal steam supply system for double reheat power generation sets Download PDFInfo
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- CN208122896U CN208122896U CN201820644918.3U CN201820644918U CN208122896U CN 208122896 U CN208122896 U CN 208122896U CN 201820644918 U CN201820644918 U CN 201820644918U CN 208122896 U CN208122896 U CN 208122896U
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- pressure cylinder
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- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 238000005485 electric heating Methods 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 230000002209 hydrophobic effect Effects 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 description 11
- 210000004907 gland Anatomy 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 241000153246 Anteros Species 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model provides a kind of shaft seal steam supply system for double reheat power generation sets, including axle envelope main pipe, auxiliary vapour steam supply station, overflow control station, attemperation control station, electric heating control station；Axle envelope main pipe is equipped with several first branch pipes, axle envelope, high pressure cylinder rear shaft seal, intermediate pressure cylinder before axle envelope, intermediate pressure cylinder rear shaft seal is separately connected before ultra-high pressure cylinder rear shaft seal, ultra-high pressure cylinder before axle envelope, high pressure cylinder, and the pipeline of axle envelope is equipped with electric heating control station before axle envelope main pipe and ultra-high pressure cylinder；It is additionally provided with several second branch pipes in axle envelope main pipe, is separately connected auxiliary vapour steam supply station, overflow control station and attemperation control station；Axle envelope main pipe end is also connected with low pressure (LP) cylinder shaft seal steam interface through attemperation control station.The utility model is able to achieve accurately controlling for each shaft end shaft seal steam temperature, while reducing electric heater capacity and size, improves unit performance driving economy.
Description
Technical field
The utility model relates to thermal power plant field more particularly to a kind of shaft seal steam systems for double reheat power generation sets
System.
Background technique
The main function of steam turbine gland system is in the case where steam turbine starts, runs, shuts down various operating conditions, is end axle envelope
Sealing provides suitable vapour source；Guide and recycle the leakage of steam turbine shaft end gland seal and height, intermediate pressure main stop valve timing steam gate valve rod
Steam and vapour-gas mixture, to prevent steam from leaking into workshop；Or the air in atmosphere is leak into low pressure (LP) cylinder, influences unit
Vacuum.
Gland seal system includes shaft seal steam supply system and shaft-packing leakage system.Conventional 600MW-1000MW capacity is primary at present
Reheating embrittlement generally uses self-sealing gland seal system：It opens in unit, shut down and the underrun stage, shaft seal steam is using external
Vapour source steam supply；When unit heavy-duty service, by high, intermediate pressure cylinder and master, the gas leakage of valve valve rod is adjusted to be supplied to low pressure shaft seal；Low pressure shaft seal supplies
Vapour is supplied to low pressure shaft seal after carrying out spray desuperheating by temperature-reducing station.
With the development of technology, domestic to have designed and a collection of ultra-high parameter supercritical turbine that put into operation, feature
It is pressure > 25MPa, 600 DEG C of main reheat temperature >.The steam turbine of this ultra-high parameter, especially Double reheat steam turbine group,
It is generally equipped with a single shunting ultra-high pressure cylinder or single shunting high pressure cylinder or list shunts intermediate pressure cylinder, the cylinder front axle singly shunted is enclosed in master
Steam or reheated steam admission end, thus the temperature of rotor at its axle envelope end than double split flow cylinder axis sealing end temperature of rotor be higher by compared with
It is more.
To prevent axle envelope thermal expansion amount to be less than rotor thermal expansion amount, shaft seal steam temperature will match with temperature of rotor, no
It can be excessive lower than temperature of rotor；And during load rejection, shutdown, hot starting, hot start, the steam supply of axle envelope is generally by auxiliary steam
Source supply, and auxiliary steam source parameter is generally at 250 DEG C or so.Existing improved method is to pass through electric heating to auxiliary steam source steam
Device feeds gland seal system again after being heated, system schematic is shown in Fig. 1.When unit opens, shuts down, removal of load operating condition when, auxiliary steam source
The steam for feeding gland seal system feeds to the forward and backward axle envelope of ultra-high pressure cylinder, the forward and backward axle envelope of high pressure cylinder, the forward and backward axle envelope of intermediate pressure cylinder simultaneously.
Double reheat steam turbine group is compared with conventional Steam Turbine, and temperature of rotor increases at axle envelope before the cylinder mainly singly shunted, and
Temperature of rotor does not increase too much at other double split flow cylinder shaft seals, increases electric heater on auxiliary steam source steam line
Mode not only increases single shaft seal steam temperature before shunting cylinder, while also improving high, intermediate pressure cylinder shaft seal steam temperature, together
When feeding of low-pressure shaft seal when need more amount of water sprayed to carry out desuperheats.
In terms of comprehensive, current above-mentioned improved method specifically has the following disadvantages：(1) high, intermediate pressure cylinder shaft seal steam temperature
Excessively high, axle envelope gap increases, and influences unit economy；(2) the auxiliary evaporation capacity for engine heated is excessive, and electric heater type selecting is big, arrangement
Difficulty, power consumption are big；(3) vapour source for feeding low pressure shaft seal first passes through electric heater heating, subtracts later by temperature-reducing station water spray
Temperature causes greatly to waste.
Accordingly, be badly in need of at present it is a kind of be able to achieve accurately controlling for each shaft end shaft seal steam temperature, while reducing electric heater
Power and size improve the shaft seal steam supply system for double reheat power generation sets of unit performance driving economy.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of standards for being able to achieve each shaft end shaft seal steam temperature
Really control, while reducing electric heater capacity and size, improve the axle envelope for double reheat power generation sets of unit performance driving economy
Steam-supplying system.
The utility model solves above-mentioned technical problem using following technical scheme：
A kind of shaft seal steam supply system for double reheat power generation sets, including axle envelope main pipe, auxiliary vapour steam supply station, overflow control
It stands, attemperation control station and electric heating control station；The axle envelope main pipe is equipped with several first branch pipes, after being separately connected ultra-high pressure cylinder
Axle envelope and intermediate pressure cylinder rear shaft seal before axle envelope, high pressure cylinder rear shaft seal, intermediate pressure cylinder before axle envelope, high pressure cylinder before axle envelope, ultra-high pressure cylinder,
In, the pipeline of axle envelope is equipped with electric heating control station before axle envelope main pipe and ultra-high pressure cylinder；It is additionally provided in the axle envelope main pipe several
Second branch pipe is separately connected auxiliary vapour steam supply station, overflow control station and attemperation control station, wherein auxiliary vapour steam supply station connects auxiliary steam
Source, overflow control station connection it is low plus or condenser, attemperation control station connect condensed water；Axle envelope main pipe end is through attemperation control
It stands and is also connected with low pressure (LP) cylinder shaft seal steam interface.
One of preferred embodiment as the utility model, the electric heating control station are equipped with and axle envelope phase before ultra-high pressure cylinder
Non-return valve and electric heater bypass after shut-off valve, electric heater after shut-off valve, electric heater before electric heater even, electric heater
Non-return valve；Wherein, also additional branches go out an electric heater drain pipe on electric heater.
One of preferred embodiment as the utility model, before the electric heater, electric heater after shut-off valve, electric heater
It is connected by pipeline between non-return valve and electric heater bypass non-return valve after shut-off valve, electric heater.
One of preferred embodiment as the utility model, the electric heater drain pipe are equipped with restricting orifice and hydrophobic
Valve, the hydrophobic pipe end of electric heater is extended to be connected with hydrophobic development unit.
One of preferred embodiment as the utility model, the auxiliary vapour steam supply station are equipped with auxiliary vapour for steam control valve, auxiliary vapour
Steam supply bypasses shut-off valve, auxiliary vapour for shut-off valve before steam control valve and auxiliary vapour steam supply by-pass throttle orifice plate.
One of preferred embodiment as the utility model, the overflow control station is equipped with overflow regulating valve and overflow is adjusted
Valve bypasses shut-off valve.
One of preferred embodiment as the utility model, the attemperation control station are equipped with temperature-reducing station regulating valve, temperature-reducing station
Regulating valve bypasses shut-off valve and direct-contact desuperheater；The spray desuperheating implement body is set to attemperation control station and axle envelope main pipe phase
Place is met, the pipeline that direct-contact desuperheater is connect with condensed water is equipped with the temperature-reducing station regulating valve, the bypass cut-off of temperature-reducing station regulating valve
Valve.
One of preferred embodiment as the utility model, axle envelope main pipe end is through direct-contact desuperheater and low pressure (LP) cylinder axle envelope
Steam supply interface is connected.
The control method of above-mentioned shaft seal steam supply system：
(1) when unit opens machine, shutdown, running on the lower load：
Shaft seal steam vapour source is provided by auxiliary steam；
1. auxiliary vapour steam supply station adjusts auxiliary vapour steam supply control valve opening according to axle envelope main-piping pressure, maintain axle envelope main-piping pressure steady
It is fixed；Meanwhile the overflow regulating valve on overflow control station remains turned-off；
2. steam directly carries out steam supply to axle envelope before and after ultra-high pressure cylinder rear shaft seal, high intermediate pressure cylinder in axle envelope main pipe；Meanwhile axis
It seals steam in main pipe and passes through electric heating control station to shaft seal steam before ultra-high pressure cylinder；State is in electric heating control station at this time：
Electric heater bypass non-return valve is automatically closed, and non-return valve automatically turns on after electric heater；Wherein, for stripping temperature according to ultra-high pressure cylinder
Temperature of rotor is adjusted at preceding axle envelope, and the moment matches with temperature of rotor；
3. steam continues through attemperation control station and carries out steam supply to low pressure (LP) cylinder axle envelope in axle envelope main pipe；At this point, temperature-reducing station
Regulating valve adjusts aperture according to the requirement of low pressure (LP) cylinder shaft seal steam temperature, by adjusting the big minor adjustment low pressure (LP) cylinder axis of condensing water flow
Gland sealing steam supply temperature makes to match for stripping temperature and temperature of rotor at low pressure (LP) cylinder axle envelope；
(2) when unit heavy-duty service operating condition：
System reaches self-sealing state, it is no longer necessary to auxiliary steam source steam supply；
1. the auxiliary vapour at auxiliary vapour steam supply station is closed for steam control valve；Meanwhile to keep auxiliary vapour steam supply station and auxiliary vapour steam supply station before
Pipeline is in hot stand-by duty, and a small amount of auxiliary steam continues through auxiliary vapour steam supply by-pass throttle orifice plate and flows into axle envelope main pipe；
2. the overflow regulating valve on overflow control station, will be more in axle envelope main pipe according to the big minor adjustment aperture of axle envelope main-piping pressure
Remaining steam overflow to it is low plus or condenser, and maintain axle envelope main-piping pressure stablize；
3. the steam of axle envelope flows into axle envelope main pipe by electric heating control station before ultra-high pressure cylinder；Electric heating control station at this time
Middle state is：Electric heater bypass non-return valve is opened, and non-return valve is closed after electric heater, and steam is bypassed by electric heater and flowed to
Axle envelope main pipe；Electric heater drain pipe drain valve is kept it turned on, and a small amount of steam flows through hydrophobic development unit by electric heater,
Electric heater is set to keep hot stand-by duty；
(3) when load rejection operating condition：
Ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder axle envelope are from being switched to and needing axle envelope main pipe steam supply to axle envelope main pipe gas leakage；
At this point, axle envelope main-piping pressure reduces, the overflow regulating valve on overflow control station is closed, and the auxiliary vapour at auxiliary vapour steam supply station supplies
Steam control valve is opened；Meanwhile axle envelope main pipe passes through electric heating control station to shaft seal steam before ultra-high pressure cylinder, electric heater receives letter
Number, according to temperature of rotor at axle envelope before ultra-high pressure cylinder, opening electric heater simultaneously maintains vapor (steam) temperature to match with temperature of rotor；This
When, unit switches to auxiliary steam steam supply state by self-sealing state.
The utility model compared with prior art the advantages of be：
(1) electric heating control station is arranged in the utility model before ultra-high pressure cylinder on shaft seal steam pipeline, and in the past in auxiliary vapour
Electric heater is arranged before steam supply station to compare, reduces electric heater capacity, reduces wasted work；Electric heater size is reduced, is simplified
Site layout project；Meanwhile reducing input cost；
(2) the electric heating control station being arranged in the utility model is able to achieve oneself of shaft seal steam and gas leakage before ultra-high pressure cylinder
Dynamic switching；
(3) the utility model is in auxiliary steam source steam supply, before the ultra-high pressure cylinder only heated to needs shaft seal steam pipeline into
Row heating, can accurately control shaft seal steam temperature before ultra-high pressure cylinder, preferably match with temperature of rotor, guarantee the safety fortune of unit
Row；Meanwhile shaft seal steam temperature before and after high, intermediate pressure cylinder will not be additionally improved, feeding of low-pressure shaft seal desuperheating water amount of water sprayed can be reduced.
Detailed description of the invention
Fig. 1 is the overall structure diagram of current existing double reheat power generation sets shaft seal steam supply system；
Fig. 2 is the overall structure diagram in embodiment 1 for the shaft seal steam supply system of double reheat power generation sets；
Fig. 3 is the overall structure diagram at auxiliary vapour steam supply station in embodiment 1；
Fig. 4 is the overall structure diagram of overflow control station in embodiment 1；
Fig. 5 is the overall structure diagram at attemperation control station in embodiment 1；
Fig. 6 is the overall structure diagram at electric heating control station in embodiment 1.
In figure：1 is axle envelope main pipe, and supplemented by 2 vapour steam supply station, and 21 be auxiliary steam source, and vapour is for steam control valve supplemented by 22, supplemented by 23
Vapour steam supply bypasses shut-off valve, and vapour is for shut-off valve before steam control valve supplemented by 24, and vapour steam supply by-pass throttle orifice plate supplemented by 25,3 be overflow
Control station, 31 for it is low plus or condenser, 32 be overflow regulating valve, 33 for overflow regulating valve bypass shut-off valve, 4 be attemperation control
It stands, 41 be condensed water, and 42 be temperature-reducing station regulating valve, and 43 bypass shut-off valve for temperature-reducing station regulating valve, and 44 be direct-contact desuperheater, and 5 are
Electric heating control station, 51 be electric heater, and 52 be shut-off valve before electric heater, and 53 be shut-off valve after electric heater, and 54 add for electricity
Non-return valve after hot device, 55 be electric heater bypass non-return valve, and 56 be electric heater drain pipe, and 57 be restricting orifice, and 58 be hydrophobic
Valve, 59 be hydrophobic development unit, and 61 be axle envelope before ultra-high pressure cylinder, and 62 be ultra-high pressure cylinder rear shaft seal, and 71 be axle envelope before high pressure cylinder, and 72 are
High pressure cylinder rear shaft seal, 81 be axle envelope before intermediate pressure cylinder, and 82 be intermediate pressure cylinder rear shaft seal, and 9 be low pressure (LP) cylinder shaft seal steam interface.
Specific embodiment
It elaborates below to the embodiments of the present invention, the present embodiment before being with technical solutions of the utility model
It puts and is implemented, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is unlimited
In following embodiments.
Embodiment 1
As shown in figures 2-6, a kind of shaft seal steam supply system for double reheat power generation sets of the present embodiment, structure is simple, makes
With convenience, including axle envelope main pipe 1, auxiliary vapour steam supply station 2, overflow control station 3, attemperation control station 4 and electric heating control station 5.
Axle envelope main pipe 1 be equipped with several first branch pipes (not indicated in figure), respectively piping connection ultra-high pressure cylinder rear shaft seal 62,
Axle envelope 81 and intermediate pressure cylinder rear shaft seal before axle envelope 71, high pressure cylinder rear shaft seal 72, intermediate pressure cylinder before axle envelope 61, high pressure cylinder before ultra-high pressure cylinder
82, wherein be additionally provided with above-mentioned electric heating control station 5 on the branch pipe pipeline of axle envelope 61 before axle envelope main pipe 1 and ultra-high pressure cylinder；Axle envelope is female
It is additionally provided with several second branch pipes (not indicating in figure) on pipe 1, is separately connected auxiliary vapour steam supply station 2, overflow control station 3 and attemperation control
Stand 4, wherein auxiliary vapour steam supply station 2 connects auxiliary steam source 21, overflow control station 3 connect it is low plus or condenser 31, attemperation control station 4
Connect condensed water 41；Further, 1 end of axle envelope main pipe behind attemperation control station 4 also with 9 phase of low pressure (LP) cylinder shaft seal steam interface
Even.
End before being equipped with the electric heater 51 being connected with axle envelope 61 before ultra-high pressure cylinder, electric heater at electric heating control station 5
Non-return valve 54 and electric heater bypass non-return valve 55 after shut-off valve 53, electric heater after valve 52, electric heater, electric heater 51,
Non-return valve 54 and electric heater bypass check after shut-off valve 53, electric heater after shut-off valve 52, electric heater before electric heater
It is connected by pipeline between valve 55；Wherein, also additional branches go out an electric heater drain pipe 56, electric heating on electric heater 51
Device drain pipe 56 is equipped with restricting orifice 57 and drain valve 58, and 56 end of electric heater drain pipe extends to and hydrophobic development unit 59
It is connected.
Auxiliary vapour steam supply station 2 is equipped with auxiliary vapour for steam control valve 22, auxiliary vapour steam supply bypass shut-off valve 23, auxiliary vapour for steam control valve
Preceding shut-off valve 24 and auxiliary vapour steam supply by-pass throttle orifice plate 25；Overflow control station 3 is equipped with overflow regulating valve 32 and overflow is adjusted
Valve bypasses shut-off valve 33.
Attemperation control station 4 is equipped with temperature-reducing station regulating valve 42, temperature-reducing station regulating valve bypass shut-off valve 43 and spray desuperheating
Device 44；Wherein, direct-contact desuperheater 44 is specifically set to attemperation control station 4 and 1 joint of axle envelope main pipe, direct-contact desuperheater 44 and solidifying
It bears water and is then equipped with above-mentioned temperature-reducing station regulating valve 42, temperature-reducing station regulating valve bypass shut-off valve 43, axle envelope main pipe 1 on the pipeline of 41 connections
End is connected through direct-contact desuperheater 44 with low pressure (LP) cylinder shaft seal steam interface 9.
Control method：
(1) when unit opens machine, shutdown, running on the lower load (shaft seal steam vapour source is provided by auxiliary steam)：
1. auxiliary vapour steam supply station 2 adjusts auxiliary vapour for 22 aperture of steam control valve according to 1 pressure of axle envelope main pipe, axle envelope main pipe 1 is maintained
Pressure is stablized；Meanwhile the overflow regulating valve 32 on overflow control station 3 remains turned-off；
2. steam directly carries out steam supply to axle envelope before and after ultra-high pressure cylinder rear shaft seal 62, high intermediate pressure cylinder in axle envelope main pipe 1；Together
When, steam is by electric heating control station 5 to 61 steam supply of axle envelope before ultra-high pressure cylinder in axle envelope main pipe 1；Electric heating control station 5 at this time
Middle state is：Electric heater bypass non-return valve 55 is automatically closed, and non-return valve 54 automatically turns on after electric heater；Wherein, for steam temperature
According to temperature of rotor is adjusted at axle envelope 61 before ultra-high pressure cylinder, the moment matches degree with temperature of rotor；
3. steam continues through attemperation control station 4 and carries out steam supply to low pressure (LP) cylinder shaft seal steam interface 9 in axle envelope main pipe 1；
At this point, temperature-reducing station regulating valve 42 adjusts aperture according to the requirement of low pressure (LP) cylinder shaft seal steam temperature, by adjusting 41 flow of condensed water
Big minor adjustment low pressure (LP) cylinder shaft seal steam temperature, makes to match for stripping temperature and temperature of rotor at low pressure (LP) cylinder axle envelope；
(2) (with the raising of unit load, ultra-high pressure cylinder front and back axle envelope, high intermediate pressure cylinder when unit heavy-duty service operating condition
Antero posterior axis leak sealing tolerance is gradually increased；When load reaches certain value, axle envelope, high intermediate pressure cylinder antero posterior axis leak sealing enter before and after ultra-high pressure cylinder
The flow of axle envelope main pipe 1 can satisfy feeding of low-pressure shaft seal needs, and system reaches self-sealing state, it is no longer necessary to auxiliary steam source
Steam supply)：
1. the auxiliary vapour at auxiliary vapour steam supply station 2 is closed for steam control valve 22；Meanwhile to keep auxiliary vapour steam supply station 2 and auxiliary vapour steam supply
2 preceding pipelines of standing are in hot stand-by duty, and a small amount of auxiliary steam continues through auxiliary vapour steam supply by-pass throttle orifice plate 25 and flows into axle envelope mother
Pipe 1；
2. the overflow regulating valve 32 on overflow control station 3 adjusts aperture according to 1 pressure size of axle envelope main pipe, by axle envelope main pipe
In 1 excess steam overflow to it is low plus or condenser 31, and maintain 1 pressure of axle envelope main pipe stablize；
3. the steam of axle envelope 61 flows into axle envelope main pipe 1 by electric heating control station 5 before ultra-high pressure cylinder；Electric heating control at this time
State is in system station 5：Electric heater bypass non-return valve 55 is opened, and non-return valve 54 is closed after electric heater, and steam passes through electric heating
Device bypass flows to axle envelope main pipe 1；The drain valve 58 of electric heater drain pipe 56 is kept it turned on, and a small amount of steam passes through electric heating
Device 51 flows through hydrophobic development unit 59, and electric heater 51 is made to keep hot stand-by duty；
(3) (when unit operates normally, shaft seal steam is typically in self-sealing state when load rejection operating condition；Unit is prominent
When so there is abnormal removal of load, ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder axle envelope are from being switched to and needing axle envelope to 1 gas leakage of axle envelope main pipe
1 steam supply of main pipe)：
1 pressure reduction of axle envelope main pipe, the overflow regulating valve 32 on overflow control station 3 are closed, and the auxiliary vapour at auxiliary vapour steam supply station 2 supplies
Steam control valve 22 is opened；Meanwhile axle envelope main pipe 1 passes through electric heating control station 5 to 61 steam supply of axle envelope, electric heater before ultra-high pressure cylinder
51 receive signal, according to temperature of rotor, opening electric heater 51 simultaneously maintain vapor (steam) temperature and rotor at axle envelope 61 before ultra-high pressure cylinder
Temperature matches；At this point, unit switches to auxiliary steam steam supply state by self-sealing state.
The advantages of this system is：
(1) electric heating control station 5 is arranged in the present embodiment before ultra-high pressure cylinder on 61 steam line of axle envelope, and in the past in auxiliary vapour
Electric heater 51 is arranged before steam supply station 2 to compare, reduces 51 power of electric heater, reduces wasted work；Reduce 51 ruler of electric heater
It is very little, simplify site layout project；Meanwhile reducing input cost；
(2) the electric heating control station 5 being arranged in the present embodiment is able to achieve oneself of 61 steam supply of axle envelope and gas leakage before ultra-high pressure cylinder
Dynamic switching；
(3) the present embodiment is in auxiliary steam source steam supply, before the ultra-high pressure cylinder only heated to needs 61 steam supply pipeline of axle envelope into
Row heating, axle envelope 61 is preferably matched with temperature of rotor for stripping temperature before capable of accurately controlling ultra-high pressure cylinder, guarantees the safety of unit
Operation；Meanwhile shaft seal steam temperature before and after high, intermediate pressure cylinder will not be additionally improved, feeding of low-pressure shaft seal desuperheating water water spray can be reduced
Amount.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (8)
1. a kind of shaft seal steam supply system for double reheat power generation sets, which is characterized in that including axle envelope main pipe, auxiliary vapour steam supply station,
Overflow control station, attemperation control station and electric heating control station；The axle envelope main pipe is equipped with several first branch pipes, is separately connected super
Before high pressure cylinder rear shaft seal, ultra-high pressure cylinder before axle envelope, high pressure cylinder before axle envelope, high pressure cylinder rear shaft seal, intermediate pressure cylinder after axle envelope and intermediate pressure cylinder
Axle envelope, wherein the pipeline of axle envelope is equipped with electric heating control station before axle envelope main pipe and ultra-high pressure cylinder；It is also set in the axle envelope main pipe
There are several second branch pipes, be separately connected auxiliary vapour steam supply station, overflow control station and attemperation control station, wherein the connection of auxiliary vapour steam supply station
Auxiliary steam source, overflow control station connection it is low plus or condenser, attemperation control station connect condensed water；Axle envelope main pipe end is through subtracting
Warm control station is also connected with low pressure (LP) cylinder shaft seal steam interface.
2. the shaft seal steam supply system according to claim 1 for double reheat power generation sets, which is characterized in that the electric heating
Control station be equipped with the electric heater being connected with axle envelope before ultra-high pressure cylinder, shut-off valve after shut-off valve, electric heater before electric heater,
Non-return valve and electric heater bypass non-return valve after electric heater；Wherein, on electric heater also additional branches go out an electric heater dredge
Water pipe.
3. the shaft seal steam supply system according to claim 2 for double reheat power generation sets, which is characterized in that the electric heating
Before device, electric heater after shut-off valve, electric heater after shut-off valve, electric heater between non-return valve and electric heater bypass non-return valve
It is connected by pipeline.
4. the shaft seal steam supply system according to claim 2 for double reheat power generation sets, which is characterized in that the electric heating
Device drain pipe is equipped with restricting orifice and drain valve, and the hydrophobic pipe end of electric heater is extended to be connected with hydrophobic development unit.
5. the shaft seal steam supply system according to claim 1 for double reheat power generation sets, which is characterized in that the auxiliary vapour supplies
Vapour station is equipped with auxiliary vapour and supplies for steam control valve, auxiliary vapour steam supply bypass shut-off valve, auxiliary vapour for shut-off valve before steam control valve and auxiliary vapour
Vapour by-pass throttle orifice plate.
6. the shaft seal steam supply system according to claim 1 for double reheat power generation sets, which is characterized in that the overflow control
System station is equipped with overflow regulating valve and overflow regulating valve bypasses shut-off valve.
7. the shaft seal steam supply system according to claim 1 for double reheat power generation sets, which is characterized in that the desuperheat control
System station is equipped with temperature-reducing station regulating valve, temperature-reducing station regulating valve bypass shut-off valve and direct-contact desuperheater；The spray desuperheating utensil
Body is set to attemperation control station and axle envelope main pipe joint, and the pipeline that direct-contact desuperheater is connect with condensed water is equipped with the desuperheat
Regulating valve, the temperature-reducing station regulating valve of standing bypass shut-off valve.
8. the shaft seal steam supply system according to claim 7 for double reheat power generation sets, which is characterized in that the axle envelope is female
Pipe end is connected through direct-contact desuperheater with low pressure (LP) cylinder shaft seal steam interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820644918.3U CN208122896U (en) | 2018-04-28 | 2018-04-28 | A kind of shaft seal steam supply system for double reheat power generation sets |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820644918.3U CN208122896U (en) | 2018-04-28 | 2018-04-28 | A kind of shaft seal steam supply system for double reheat power generation sets |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425706A (en) * | 2018-04-28 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of shaft seal steam supply system and its control method for double reheat power generation sets |
| CN114251135A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing type steam turbine unit |
-
2018
- 2018-04-28 CN CN201820644918.3U patent/CN208122896U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425706A (en) * | 2018-04-28 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of shaft seal steam supply system and its control method for double reheat power generation sets |
| CN108425706B (en) * | 2018-04-28 | 2023-11-14 | 中国大唐集团科学技术研究院有限公司华东分公司 | Shaft seal steam supply system for secondary reheating unit and control method of shaft seal steam supply system |
| CN114251135A (en) * | 2020-09-23 | 2022-03-29 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing type steam turbine unit |
| CN114251135B (en) * | 2020-09-23 | 2024-03-19 | 上海电气电站设备有限公司 | Low-flow low-load operation method of steam seal system of steam supplementing turbine unit |
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