CN108194151A - A kind of turbine shaft gland sealing steam supply regulating device and method - Google Patents
A kind of turbine shaft gland sealing steam supply regulating device and method Download PDFInfo
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- CN108194151A CN108194151A CN201810114587.7A CN201810114587A CN108194151A CN 108194151 A CN108194151 A CN 108194151A CN 201810114587 A CN201810114587 A CN 201810114587A CN 108194151 A CN108194151 A CN 108194151A
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- reheating
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- regulating valve
- cold section
- steam
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 133
- 210000004907 gland Anatomy 0.000 title claims abstract description 66
- 238000007789 sealing Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003303 reheating Methods 0.000 claims abstract description 107
- 230000008859 change Effects 0.000 claims abstract description 6
- 230000006837 decompression Effects 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 claims description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000013589 supplement Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011161 development Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 2
- 230000033228 biological regulation Effects 0.000 abstract description 18
- 238000013461 design Methods 0.000 abstract description 4
- 238000012856 packing Methods 0.000 description 13
- 238000012423 maintenance Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 4
- 238000010025 steaming Methods 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 240000002853 Nelumbo nucifera Species 0.000 description 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 1
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 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
- F01D11/06—Control thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a kind of turbine shaft gland sealing steam supply regulating device and methods, reheating cold section of the device including axle envelope inlet main pipe inlet end pipeline described in parallel communication carrys out pipeline, auxiliary steam header comes pipeline and shaft seal overflow pipeline, cold section of the reheating is come on pipeline to be provided with the first regulating valve, the auxiliary steam header comes on pipeline to be provided with the second regulating valve, third regulating valve is provided on the shaft seal overflow pipeline, first regulating valve, second regulating valve and third regulating valve are controlled with DCS control systems to be connected, for according to the steam pressure situation of change in the pipeline of axle envelope inlet main pipe outlet side, the first regulating valve is first adjusted in supercharging or decompression and adjusts the second regulating valve again, and finally adjust third regulating valve in decompression；As a result of three regulating valves in parallel, with reference to preferential adjustment sequence, axial seal pressure stability when improving generating set peak regulation or shutting down meets safe and cost-effective double design requirement.
Description
Technical field
Steam supply regulation technology field more particularly to a kind of axis of steam turbine the present invention relates to steam turbine gland system
Gland sealing steam supply regulating device and steam supply adjusting method.
Background technology
In recent years, increasing with the Large Steam Turbine-Generator group depth peak regulation period, during generating set peak regulation,
Steam turbine gland system mainly takes auxiliary steam or main and auxiliary steam mixing steam supply way, and steam turbine gland system is automatic
It controls harmony and anti-interference all poor, in variable working condition or extreme operating condition stage, be easy to cause axial seal pressure and the tune of temperature
It is whole not normal, lead to the fluctuation of axial seal pressure and temperature, and packing is caused to deform or wear, not only affect the warp of steam turbine
Ji property, and the safety of unit is affected, and increase the maintenance cost of packing, it is mainly manifested in unit running process
Heat consumption increases, and dismantles difficult after the deformation of part packing during overhaul or even needs replacing.
In the prior art, the design of large-size steam turbine gland seal system is using self-sealing system, when generating set startup, idling
When lotus and underload, auxiliary steam or main and auxiliary steam mixing steam supply are taken, when the arrival of generating set load is a certain proportion of specified
During load, for steam turbine gland system mainly by high pressure gland packing leakage for low pressure shaft seal vapour, gland seal system back-steam passes through axle envelope
Heater is after cooling hydrophobic to be dredged through multilevel water seal to condenser.
But axle envelope is participated in using high pressure main steam when generating set starts or trips and is adjusted, to improve gland steam
Parameter is adapted to rotor and cylinder temperature.Since axle envelope steam consumption is small, former high pressure shaft seal station degree of regulation is low, automatically controls coordination
Property and anti-interference it is poor, thus easily made in variable working condition and extreme operating condition axial seal pressure and temperature adjustment it is not normal so that axis
There is fluctuation in seal pressure and temperature, easily cause packing deformation or abrasion, not only influence the economy of steam turbine, Er Qieying
Ring the safety of generating set.
Therefore, the steam supply regulative mode of existing steam turbine gland system be difficult to take into account it is energy saving will with the dual of safe operation
It asks, there is an urgent need to make improvements.
Invention content
In order to solve the above technical problems, the present invention provides a kind of turbine shaft gland sealing steam supply regulating device, generator can be promoted
Axial seal pressure stability when group peak regulation or shutdown meets safety and cost-effective double design requirement.
Meanwhile the invention also provides a kind of turbine shaft gland sealing steam supply adjusting methods, can promote generating set peak regulation or stop
Axial seal pressure stability during machine takes into account energy saving and safe operation double requirements.
Technical scheme is as follows：A kind of turbine shaft gland sealing steam supply regulating device, including axle envelope described in parallel communication
Cold section of the reheating of inlet main pipe inlet end pipeline carrys out pipeline, auxiliary steam header comes pipeline and shaft seal overflow pipeline, the reheating
Cold section is carried out on pipeline to be provided with the first regulating valve, and the auxiliary steam header comes on pipeline to be provided with the second regulating valve, the axis
Third regulating valve is provided on envelope overflow pipe, first regulating valve, the second regulating valve and third regulating valve are controlled with DCS
System control connection, for according to the steam pressure situation of change in the pipeline of axle envelope inlet main pipe outlet side, being pressurized or depressurizing
Shi Junxian adjusts the first regulating valve and adjusts the second regulating valve again, and finally adjusts third regulating valve in decompression.
The turbine shaft gland sealing steam supply regulating device, wherein：Come on pipeline to be provided in cold section of the reheating first-hand
Dynamic door and the first electrically operated gate, first electrically operated gate are located at before the first regulating valve, and the first manual door is located at first and adjusts
After valve.
The turbine shaft gland sealing steam supply regulating device, wherein：Come on pipeline to be parallel with by the of first for cold section in the reheating
Road electrically operated gate, one end of the first bypass electrically operated gate carry out pipeline with cold section of the reheating of the first electrically operated gate front end and are connected, this
Cold section of the other end and the reheating that first manual is held behind the door of one bypass electrically operated gate carrys out pipeline and is connected.
The turbine shaft gland sealing steam supply regulating device, wherein：To be additionally provided with first on pipeline for cold section in the reheating
Non-return door and first electronic total door, first electronic total door are located at before the first non-return door, and the first non-return door is located at the
Before one electrically operated gate.
A kind of turbine shaft gland sealing steam supply adjusting method, using any of the above-described turbine shaft gland sealing steam supply regulating device,
Include the following steps：
A1, when the pressure value of axle envelope inlet main pipe is less than set lower limiting value, DCS control systems control first regulating valve
Aperture supplements steam supply for cold section by reheating to axle envelope inlet main pipe；
If A2, the valve of first regulating valve have been in the state of standard-sized sheet, and the pressure value of axle envelope inlet main pipe is less than set
Lower limiting value when, then DCS control systems control the aperture of the second regulating valve, by cold section of reheating and auxiliary steam header combine to
Axle envelope inlet main pipe supplements steam supply.
The turbine shaft gland sealing steam supply adjusting method, includes the following steps：
B1, when the pressure value of axle envelope inlet main pipe is higher than set upper limit value, DCS control systems control first regulating valve
Aperture reduces the cold section of supplement steam supply to axle envelope inlet main pipe of reheating；
If B2, the valve of first regulating valve have been in fully closed state, and the pressure value of axle envelope inlet main pipe is higher than set
Upper limit value when, then DCS control systems control the aperture of the second regulating valve, reduce auxiliary steam header to axle envelope inlet main pipe
Supplement steam supply；
If the valve of B3, first regulating valve and the second regulating valve have been in fully closed state, and the pressure of axle envelope inlet main pipe
When force value is higher than set upper limit value, then the aperture of DCS control systems control third regulating valve, extra gland steam is overflow
It flow to #1 low-pressure heaters or condenser.
The turbine shaft gland sealing steam supply regulating device, wherein：Including cold section of reheating being connect with DCS control system signals
Thermometer and cold section of hydrophobic electrically operated gate of reheating with the control connection of DCS control systems；Wherein, cold section of thermometer of the reheating
Be arranged on cold section of drain water piping of reheating with cold section of hydrophobic electrically operated gate of reheating, the incoming end of the cold section of drain water piping of reheating with
Cold section of reheating carrys out pipeline and is connected, and before the first regulating valve, the end that picks out of described cold section of drain water piping of reheating is connected to
Hydrophobic development unit changes for DCS control systems according to the temperature signal of cold section of thermometer of reheating, controls cold section of hydrophobic electricity of reheating
Being turned on and off for dynamic door, cold section of liquid steam come in pipeline of reheating is dredged to hydrophobic development unit.
A kind of turbine shaft gland sealing steam supply adjusting method, using above-mentioned turbine shaft gland sealing steam supply regulating device, including following
Step：
C1, cold section of hydrophobic electrically operated gate of reheating be in close in the case of, when cold section of vapor (steam) temperature value come in pipeline of reheating is low
When 220 DEG C of set lower limiting value, cold section of hydrophobic electrically operated gate of reheating is opened in the control of DCS control systems, starts to reheating cold section
The steam come in pipeline carries out hydrophobic treatment；
C2, in the case where cold section of hydrophobic electrically operated gate of reheating is in and opens, when the vapor (steam) temperature value that cold section of reheating is come in pipeline is high
When 270 DEG C of set upper limit value, the control of DCS control systems closes the hydrophobic electrically operated gate of cold section of reheating and stops carrying out reheating for cold section
Steam in pipeline carries out hydrophobic treatment.
The turbine shaft gland sealing steam supply regulating device, wherein：The auxiliary connecting with DCS control system signals is further included to steam
Vapour header thermometer and the hydrophobic electrically operated gate of auxiliary steam header with the control connection of DCS control systems；Wherein, the auxiliary
Steam header thermometer and the hydrophobic electrically operated gate of auxiliary steam header are arranged on auxiliary steam header drain water piping, the auxiliary
The incoming end of steam header drain water piping carrys out pipeline with auxiliary steam header and is connected, and before the second regulating valve, described
The end that picks out of auxiliary steam header drain water piping is connected to rake, for DCS control systems according to auxiliary steam header temperature
Auxiliary steam header is carried out pipeline by the temperature signal variation of meter, being turned on and off for the control hydrophobic electrically operated gate of auxiliary steam header
Interior liquid steam is dredged to rake.
A kind of turbine shaft gland sealing steam supply adjusting method, using above-mentioned turbine shaft gland sealing steam supply regulating device, including following
Step：
D1, the hydrophobic electrically operated gate of auxiliary steam header be in close in the case of, the steam in pipeline is carried out when auxiliary steam header
When temperature value is less than 200 DEG C of set lower limiting value, the hydrophobic electrically operated gate of auxiliary steam header is opened in the control of DCS control systems, is opened
Begin to carry out auxiliary steam header the steam in pipeline and carry out hydrophobic treatment；
D2, the hydrophobic electrically operated gate of auxiliary steam header be in open in the case of, the steam in pipeline is carried out when auxiliary steam header
When temperature value is higher than 220 DEG C of set upper limit value, the hydrophobic electrically operated gate of auxiliary steam header is closed in the control of DCS control systems, is stopped
The steam only come to auxiliary steam header in pipeline carries out hydrophobic treatment.
A kind of turbine shaft gland sealing steam supply regulating device and method provided by the present invention, as a result of three tune in parallel
Save valve, with reference to preferential adjustment sequence, improve generating set peak regulation or shut down when axial seal pressure stability, meet safety with
Cost-effective double design requirement.
Description of the drawings
Fig. 1 is the structure principle chart of turbine shaft gland sealing steam supply regulating system embodiment of the present invention；
Fig. 2 is axle envelope main-piping pressure control principle drawing used in turbine shaft gland sealing steam supply regulating system embodiment of the present invention；
Fig. 3 is shaft seal steam automatic hydrophobic control principle drawing used in turbine shaft gland sealing steam supply regulating system embodiment of the present invention.
Specific embodiment
Below with reference to attached drawing, the specific embodiment and embodiment of the present invention are described in detail, described tool
Body embodiment only to explain the present invention, is not intended to limit the specific embodiment of the present invention.
As shown in Figure 1, Fig. 1 is the structure principle chart of turbine shaft gland sealing steam supply regulating system embodiment of the present invention, the present invention
A kind of turbine shaft gland sealing steam supply regulating device, be arranged on the inlet end pipeline 152 of axle envelope inlet main pipe 150, the axle envelope
The outlet side pipeline 151 of inlet main pipe 150 respectively with two grades of axle envelopes of high pressure cylinder 110, one grade of axle envelope of intermediate pressure cylinder 120 and low pressure
One grade of axle envelope of cylinder 130 is connected, and the outlet side pipeline 151 of axle envelope inlet main pipe 150 is in one grade of axis of access low pressure (LP) cylinder 130
Pass through low pressure shaft seal attemperator 140 before envelope；One grade of axle envelope of the high pressure cylinder 110 after corresponding valve back-steam to deoxygenation
Device, two grades of axle envelopes of the third gear axle envelope of the high pressure cylinder 110, two grades of axle envelopes of intermediate pressure cylinder 120 and low pressure (LP) cylinder 130 are through corresponding
Back-steam is to gland heater after valve.
A kind of turbine shaft gland sealing steam supply regulating device of the present invention includes 150 air inlet of axle envelope inlet main pipe described in parallel communication
Cold section of the reheating in end pipe road 152 carrys out pipeline 200, auxiliary steam header comes pipeline 300 and shaft seal overflow pipeline 400, the reheating
Cold section is carried out on pipeline 200 to be provided with the first regulating valve 210, and the auxiliary steam header comes on pipeline 300 to be provided with the second adjusting
Valve 310 is provided with third regulating valve 410, first regulating valve 210, the second regulating valve on the shaft seal overflow pipeline 400
310 and third regulating valve 410 with DCS control systems (Distributed Control System, Distributed Control System) 500
Control connection, for according to the steam pressure situation of change in 150 outlet side pipeline 151 of axle envelope inlet main pipe, being pressurized or subtracting
The first regulating valve 210 is first adjusted during pressure and adjusts the second regulating valve 310 again, and third regulating valve 410 is finally adjusted in decompression,
So that between axial seal pressure of the steam turbine under any operating mode is stable in 30~50KPa, it is particluarly suitable for generating set
Peak regulation or shut down during use, with promoted generating set peak regulation or shut down when axial seal pressure stability.
Specifically, axial seal pressure meter 153 is provided on the outlet side pipeline 151 of the axle envelope inlet main pipe 150, the axis
Seal pressure meter 153 is connect with 500 signal of DCS control systems；With reference to shown in Fig. 2, Fig. 2 is that turbine shaft gland sealing steam supply of the present invention is adjusted
Axle envelope main-piping pressure control principle drawing used in system embodiment, (i.e. axle envelope main-piping pressure in Fig. 2 measures axial seal pressure meter 153
Device) for measuring axle envelope in real time into the vapour pressure force value in 150 outlet side pipeline 151 of vapour main pipe, and Real-time Feedback is controlled to DCS
System 500 processed, the vapour pressure force value which feeds back according to axial seal pressure meter 153, with the preset upper limit
Value (such as 50KPa) and lower limiting value (such as 30KPa) are compared, and accurate first regulating valve 210 that controls to adjust is (i.e. in Fig. 2
Cold section of reheating is to axle envelope regulating valve), the second regulating valve 310 (i.e. auxiliary steam to axle envelope regulating valve) in Fig. 2 and third adjust
The aperture of valve 410 (i.e. shaft seal overflow regulating valve in Fig. 2), and after the axial seal pressure meter 153 can also measure adjusting in real time
Axial seal pressure, and Real-time Feedback is to DCS control systems 500.
It is preferred that first regulating valve 210, the second regulating valve 310 and third regulating valve 410 use model DN50
And equipped with the high-precision pneumatic control valve for starting control device, for controlling system using the DCS of model DSO22 or DSO14
The accurate adjustment of axial seal pressure is realized under the control of system 500.
Based on above-mentioned turbine shaft gland sealing steam supply regulating device, the present invention also provides a kind of turbine shaft gland sealing steam supply adjusting sides
Method in generating set peak regulation or during shutting down, specifically includes following any one or more the step of adjusting axial seal pressure：
A1, when the pressure value of axle envelope inlet main pipe 150 is less than set lower limiting value, the accurately control the of DCS control systems 500
The aperture of one regulating valve 210 preferentially supplements steam supply so that axle envelope inlet main pipe by cold section of reheating to axle envelope inlet main pipe 150
150 pressure value is accurately controlled between set lower limiting value and upper limit value；
If A2, the valve of first regulating valve 210 have been in the state of standard-sized sheet, and the pressure value of axle envelope inlet main pipe 150 is still
During less than set lower limiting value, then DCS control systems 500 accurately control the aperture of the second regulating valve 310 again, cold by reheating
Section and auxiliary steam header, which are combined to axle envelope inlet main pipe 150, supplements steam supply so that the pressure value of axle envelope inlet main pipe 150 is accurate
Control is between set lower limiting value and upper limit value；
B1 and when axle envelope inlet main pipe 150 pressure value be higher than set upper limit value when, DCS control systems 500 accurately control
The aperture of first regulating valve 210, it is preferential to reduce the cold section of supplement steam supply to axle envelope inlet main pipe 150 of reheating so that axle envelope air inlet
The pressure value of main pipe 150 is accurately controlled between set lower limiting value and upper limit value；
If B2, the valve of first regulating valve 210 have been in fully closed state, and the pressure value of axle envelope inlet main pipe 150 is still
During higher than set upper limit value, then DCS control systems 500 accurately control the aperture of the second regulating valve 310 again, then reduce auxiliary
Help supplement steam supply of the steam header to axle envelope inlet main pipe 150 so that the pressure value of axle envelope inlet main pipe 150 is accurately controlled in institute
Between the lower limiting value and upper limit value of setting；
If B3, the valve of 210 and second regulating valve 310 of the first regulating valve have been in fully closed state, and axle envelope air inlet is female
When the pressure value of pipe 150 is still higher than set upper limit value, then DCS control systems 500 accurately control third regulating valve 410 again
Aperture, finally by extra gland steam overflow to #1 low-pressure heaters or condenser so that axle envelope inlet main pipe 150
Pressure value is accurately controlled between set lower limiting value and upper limit value.
It returns shown in Fig. 1, in a kind of specific embodiment of turbine shaft gland sealing steam supply regulating device of the present invention, preferably
It is to come on pipeline 200 to be provided with 220 and first electrically operated gate 230 of first manual door, first electrically operated gate for cold section in the reheating
230 be located at the first regulating valve 210 before (it is so-called before or front end refer to the direction flowed according to steam, first flowed by steam
The position crossed, similarly hereinafter), the first manual door 220 is located at after the first regulating valve 210 that (after so-called or rear end refers to
According to the direction that steam flows, by the position flowed through after steam, similarly hereinafter), for the first regulating valve 210 is carried out isolation maintenance and
Maintenance.
Further, carry out on pipeline 200 to be parallel with the first bypass electrically operated gate 240 in cold section of the reheating, by the of described first
One end of road electrically operated gate 240 carrys out pipeline 200 with cold section of the reheating of 230 front end of the first electrically operated gate and is connected, and first bypass is electronic
The other end of door 240 carrys out pipeline 200 with cold section of the reheating of 220 rear end of first manual door and is connected, for overhauling and conserving first
Ensure the normal operation of axial seal pressure during regulating valve 210.
It is preferred that in the reheating cold section carry out on pipeline 200 to be additionally provided with first non-return 250 and first electronic total door of door
260, first electronic total door 260 is located at before the first non-return door 250, for being turned on and off the cold section of steaming come of entire reheating
Vapour, the first non-return door 250 are located at before the first electrically operated gate 230, and the steam for preventing cold section of reheating from coming is flow backwards.
It is preferred that come on pipeline 300 to be provided with the second manually operated door and the second electrically operated gate (figure in the auxiliary steam header
Shown in 1 but non-label), second electrically operated gate is located at before the second regulating valve 310, and second manually operated door is located at the
After two regulating valves 310, for carrying out isolation maintenance and maintenance to the second regulating valve 310.
It is preferred that carry out on pipeline 300 to be additionally provided with the second non-return door and second electronic total in the auxiliary steam header
Door (shown in Fig. 1 but non-label), second electronic total door is located at before the second non-return door, whole for being turned on and off
The steam that a auxiliary steam header comes, the second non-return door is located at before the second electrically operated gate, for preventing auxiliary steam header
The steam come is flow backwards.
It is preferred that third manually operated door and third electrically operated gate are provided on the shaft seal overflow pipeline 400 (in Fig. 1
Show but non-label), the third electrically operated gate is located at before third regulating valve 410, and the third manually operated door is located at third tune
After saving valve 410, for carrying out isolation maintenance and maintenance to third regulating valve 410.
Further, the second bypass electrically operated gate is also parallel on the shaft seal overflow pipeline 400 (to show in Fig. 1
But non-label), one end of the second bypass electrically operated gate is connected with the shaft seal overflow pipeline 400 of third electrically operated gate front end, should
The other end of second bypass electrically operated gate is connected with the shaft seal overflow pipeline 400 of third manually operated door rear end, for overhauling and conserving
Ensure the normal operation of axial seal pressure during third regulating valve 410.
Caused by above turbine shaft gland sealing steam supply regulating device and adjusting method can effectively prevent axial seal pressure fluctuation
Packing deforms, and at the beginning of pressure is adjusted, first regulating valve 210, the second regulating valve 310 and third regulating valve 410 are located
In fully closed stand-by state；Meanwhile packing caused by axle envelope temperature fluctuation deforms in order to prevent, it is also necessary to according to axle envelope cushion gas
The temperature change in source carries out appropriate hydrophobic treatment, and conventional processing means are all continuous hydrophobics, if during generator group leader
Between be in the state of heavy-duty service, then continuous hydrophobic will cause a large amount of high-quality steams to lose, and seriously affect power generation
The economy of unit.
For this purpose, a kind of turbine shaft gland sealing steam supply regulating device of the present invention is further included and is connect with 500 signal of DCS control systems
Cold section of thermometer 270 of reheating and auxiliary steam header thermometer 370 and with DCS control systems 500 control connection reheating
Cold section of hydrophobic electrically operated gate 280 and the hydrophobic electrically operated gate 380 of auxiliary steam header；Wherein, cold section of thermometer 270 of the reheating and reheating
Cold section of hydrophobic electrically operated gate 280 is arranged on cold section of drain water piping of reheating, the incoming end of the cold section of drain water piping of reheating with again
Cold section of heat carrys out pipeline 200 and is connected, and before the first regulating valve 210, and the end that picks out of described cold section of drain water piping of reheating connects
Hydrophobic development unit is passed to, is changed for DCS control systems 500 according to the temperature signal of cold section of thermometer 270 of reheating, controls reheating
Being turned on and off for cold section of hydrophobic electrically operated gate 280, cold section of liquid steam come in pipeline 200 of reheating is dredged to dewatering capacity-enlarging
Device；And the auxiliary steam header thermometer 370 and the hydrophobic electrically operated gate 380 of auxiliary steam header are arranged at auxiliary steam header
On drain water piping, incoming end and the auxiliary steam header of the auxiliary steam header drain water piping carry out pipeline 300 and are connected, and position
Before the second regulating valve 310, the end that picks out of the auxiliary steam header drain water piping is connected to rake, is controlled for DCS
System 500 changes according to the temperature signal of auxiliary steam header thermometer 370, controls the hydrophobic electrically operated gate 380 of auxiliary steam header
Be turned on and off, the liquid steam that auxiliary steam header comes in pipeline 300 is dredged to rake；So that steam turbine exists
Axle envelope temperature under any operating mode all≤320 DEG C, is particluarly suitable for peak load regulation or is used during shutting down, to promote unit
Axle envelope temperature stability when peak regulation or shutdown, not only ensure that axle envelope standby steam source temperature was met the requirements, but also reduces spare vapour
The heat source loss in source.
It is preferred that the incoming end of the cold section of drain water piping of reheating is located at the first non-return 250 and first electrically operated gate 230 of door
Between, and pass through cold section of reheating of corresponding valve access and come the front end that pipeline 200 and first bypasses electrically operated gate 240.
It is preferred that the incoming end of the auxiliary steam header drain water piping be located at the second non-return door and the second electrically operated gate it
Between, and carry out pipeline 300 by corresponding valve access auxiliary steam header.
With reference to shown in Fig. 3, Fig. 3 is shaft seal steam automatic sparse used in turbine shaft gland sealing steam supply regulating system embodiment of the present invention
Water management schematic diagram, on the one hand, cold section of thermometer 270 of reheating (i.e. axle envelope reheating gas source temperature measuring device in Fig. 3) is used for
The vapor (steam) temperature value that cold section of reheating is come in pipeline 200 is measured in real time, and Real-time Feedback is to DCS control systems 500, DCS controls
The vapor (steam) temperature value that system 500 is fed back according to cold section of thermometer 270 of reheating, with preset upper limit value (such as 270 DEG C) and
Lower limiting value (such as 220 DEG C) is compared, and (i.e. axle envelope reheating air source in Fig. 3 is adjusted the hydrophobic electrically operated gate 280 of cold section of reheating of control
Valve) be turned on and off, and cold section of thermometer 270 of reheating can also measure in real time adjusting after cold section of steaming come in pipeline 200 of reheating
Stripping temperature, and Real-time Feedback is to DCS control systems 500.
On the other hand, auxiliary steam header thermometer 370 (i.e. axle envelope auxiliary gas source temperature measuring device in Fig. 3) is used for
The vapor (steam) temperature value that auxiliary steam header comes in pipeline 300 is measured in real time, and Real-time Feedback is to DCS control systems 500, the DCS
The vapor (steam) temperature value that control system 500 is fed back according to auxiliary steam header thermometer 370, with preset upper limit value (such as
220 DEG C) and lower limiting value (such as 200 DEG C) be compared, control hydrophobic (the i.e. axle envelope in Fig. 3 of electrically operated gate 380 of auxiliary steam header
Auxiliary steams hydrophobic electrically operated gate) be turned on and off, and auxiliary steam header thermometer 370 assists steaming after can also measuring adjusting in real time
Vapour header carrys out the vapor (steam) temperature in pipeline 300, and Real-time Feedback is to DCS control systems 500.
Based on above-mentioned turbine shaft gland sealing steam supply regulating device, turbine shaft gland sealing steam supply adjusting method provided by the invention,
During generating set peak regulation or shutdown, following any one or more the step of adjusting axle envelope temperature are specifically further included：
C1, cold section of hydrophobic electrically operated gate 280 of reheating be in close in the case of, when cold section of steam temperature come in pipeline 200 of reheating
When angle value is less than 220 DEG C of set lower limiting value, the hydrophobic electrically operated gate 280 of cold section of reheating is opened in the control of DCS control systems 500, is opened
Begin the steam progress hydrophobic treatment that cold section is come in pipeline 200 to reheating；
C2, cold section of hydrophobic electrically operated gate 280 of reheating be in open in the case of, when cold section of steam temperature come in pipeline 200 of reheating
When angle value is higher than 270 DEG C of set upper limit value, the hydrophobic electrically operated gate 280 of cold section of reheating is closed in the control of DCS control systems 500, is stopped
The steam that only cold section is come in pipeline 200 to reheating carries out hydrophobic treatment；
D1, the hydrophobic electrically operated gate 380 of auxiliary steam header be in close in the case of, when auxiliary steam header comes in pipeline 300
Vapor (steam) temperature value less than 200 DEG C of set lower limiting value when, it is hydrophobic that auxiliary steam header is opened in the control of DCS control systems 500
Electrically operated gate 380 starts to carry out auxiliary steam header the steam in pipeline 300 and carries out hydrophobic treatment；
D2, the hydrophobic electrically operated gate 380 of auxiliary steam header be in open in the case of, when auxiliary steam header comes in pipeline 300
Vapor (steam) temperature value higher than 220 DEG C of set upper limit value when, it is hydrophobic that auxiliary steam header is closed in the control of DCS control systems 500
Electrically operated gate 380 stops carrying out auxiliary steam header the steam in pipeline 300 and carries out hydrophobic treatment.
It returns shown in Fig. 1, in a kind of specific embodiment of turbine shaft gland sealing steam supply regulating device of the present invention, preferably
To be additionally provided with axle envelope thermometer 154 on the outlet side pipeline 151 of axle envelope inlet main pipe 150, the axle envelope thermometer 154 with
500 signal of DCS control systems connects, for monitoring the vapor (steam) temperature in 150 outlet side pipeline 151 of axle envelope inlet main pipe in real time
Value.
The turbine shaft gland sealing steam supply regulating device of the present invention technical solution that related pressure is adjusted with method and temperature is adjusted
Advantage is as follows：
1st, energy saving and safe operation double requirements are realized, are substantially dropped than main steam condition based on cold section of vapour source vapour parameter of reheating
It is low, it thereby reduces the waste of high-quality carbonated drink and reduces plant maintenance amount, achieve the purpose that cost efficiency；Efficiently realize vapour
Cold section of vapour source of turbine axle envelope reheating to axle envelope regulating valve accurately controls, it is ensured that axial seal pressure and temperature in unit varying load process
Stabilization, it is good to maintain packing working performance, and can prevent axle envelope temperature fluctuation from packing being caused to generate alternate stress and cause vapour
Envelope deformation or abrasion, avoiding gland leak-off increase influences the economy of unit.
2nd, used DCS control systems make cold section of vapour source shaft seal steam control of reheating and auxiliary steam shaft seal steam source
No-harass switch is realized between control, improves disturbance rejection and accuracy；Entire control system high degree of automation, operation side
Just, principle is simple, safe and reliable to operation, and installation workload and plant maintenance amount are few, can put into for a long time, ensure that gland seal system
Safe and stable operation.
3rd, axial seal pressure and temperature fluctuation caused by effectively reducing generating set peak regulation in the process, reduce packing alternation
Stress causes packing to deform, so as to reduce packing because wearing the increased situation of bad steam loss, to the safety and economic operation of unit
It is of great significance, so as to improve adaptability and flexibility of the gland seal system to generating set depth peak regulation.
By putting into operation on certain southern Utilities Electric Co., Ltd. #4 units, in generating set peaking operation, pass through DCS
Control system changes according to axial seal pressure realizes that cold section of vapour source pneumatic control valve of axle envelope reheating preferentially adjusts, and assists steaming with reference to axle envelope
Steam control valve auxiliary adjustment, not only in peak load regulation or stopping process, by cold section of vapour source pneumatic control valve of axle envelope reheating and
Axle envelope auxiliary steam regulating valve gradient is adjusted, and is improved the stability of peak load regulation axial seal pressure and temperature, is reduced packing
Thermal stress and thermal deformation, and ensure that cold section of vapour source of axle envelope reheating and axle envelope auxiliary steam temperature meet spare requirement, it reduces
The heat source loss of standby steam source, achieves good safety economy benefit.
It should be understood that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not sufficient to the limitation present invention's
Technical solution for those of ordinary skills, within the spirit and principles in the present invention, can add according to the above description
Increasing and decreasing, replacing, converting or improving, and all these increases and decreases, replacement, transformation or improved technical solution, it should all belong to this
The protection domain of invention appended claims.
Claims (10)
1. a kind of turbine shaft gland sealing steam supply regulating device, which is characterized in that including axle envelope inlet main pipe air inlet described in parallel communication
Cold section of the reheating in end pipe road carrys out pipeline, auxiliary steam header comes pipeline and shaft seal overflow pipeline, and cold section of the reheating is come on pipeline
It is provided with the first regulating valve, the auxiliary steam header carrys out on pipeline to be provided with the second regulating valve, on the shaft seal overflow pipeline
Third regulating valve is provided with, first regulating valve, the second regulating valve and third regulating valve are controlled with DCS control systems to be connected
It connects, for according to the steam pressure situation of change in the pipeline of axle envelope inlet main pipe outlet side, first being adjusted in supercharging or decompression
First regulating valve adjusts the second regulating valve again, and finally adjusts third regulating valve in decompression.
2. turbine shaft gland sealing steam supply regulating device according to claim 1, it is characterised in that：It is managed in cold section of the reheating
First manual door and the first electrically operated gate are provided on road, first electrically operated gate is located at before the first regulating valve, described first-hand
Dynamic door is located at after the first regulating valve.
3. turbine shaft gland sealing steam supply regulating device according to claim 2, it is characterised in that：It is managed in cold section of the reheating
The first bypass electrically operated gate is parallel on road, one end of the first bypass electrically operated gate is come with cold section of the reheating of the first electrically operated gate front end
Pipeline is connected, and cold section of the other end and the reheating that first manual is held behind the door of the first bypass electrically operated gate carrys out pipeline and be connected.
4. the turbine shaft gland sealing steam supply regulating device according to right wants 1, it is characterised in that：Carry out pipeline for cold section in the reheating
On be additionally provided with the first non-return door and first electronic total door, first electronic total door is located at before the first non-return door, described
One non-return door is located at before the first electrically operated gate.
5. a kind of turbine shaft gland sealing steam supply adjusting method utilizes the turbine shaft gland sealing steam supply tune any in Claims 1-4 4
Regulating device, which is characterized in that include the following steps：
A1, when the pressure value of axle envelope inlet main pipe is less than set lower limiting value, DCS control systems control first regulating valve
Aperture supplements steam supply for cold section by reheating to axle envelope inlet main pipe；
If A2, the valve of first regulating valve have been in the state of standard-sized sheet, and the pressure value of axle envelope inlet main pipe is less than set
Lower limiting value when, then DCS control systems control the aperture of the second regulating valve, by cold section of reheating and auxiliary steam header combine to
Axle envelope inlet main pipe supplements steam supply.
6. turbine shaft gland sealing steam supply adjusting method according to claim 5, which is characterized in that include the following steps：
B1, when the pressure value of axle envelope inlet main pipe is higher than set upper limit value, DCS control systems control first regulating valve
Aperture reduces the cold section of supplement steam supply to axle envelope inlet main pipe of reheating；
If B2, the valve of first regulating valve have been in fully closed state, and the pressure value of axle envelope inlet main pipe is higher than set
Upper limit value when, then DCS control systems control the aperture of the second regulating valve, reduce auxiliary steam header to axle envelope inlet main pipe
Supplement steam supply；
If the valve of B3, first regulating valve and the second regulating valve have been in fully closed state, and the pressure of axle envelope inlet main pipe
When force value is higher than set upper limit value, then the aperture of DCS control systems control third regulating valve, extra gland steam is overflow
It flow to #1 low-pressure heaters or condenser.
7. turbine shaft gland sealing steam supply regulating device according to claim 1, it is characterised in that：Including with DCS control systems
Cold section of thermometer of reheating of signal connection and cold section of hydrophobic electrically operated gate of reheating with the control connection of DCS control systems；Wherein,
Described cold section of thermometer of reheating and cold section of hydrophobic electrically operated gate of reheating are arranged on cold section of drain water piping of reheating, cold section of the reheating
Cold section of the incoming end of drain water piping and reheating carrys out pipeline and is connected, and before the first regulating valve, cold section of the reheating is hydrophobic
The end that picks out of pipeline is connected to hydrophobic development unit, is changed for DCS control systems according to the temperature signal of cold section of thermometer of reheating,
Being turned on and off for control cold section of hydrophobic electrically operated gate of reheating, cold section of liquid steam come in pipeline of reheating is dredged to dewatering capacity-enlarging
Device.
8. a kind of turbine shaft gland sealing steam supply adjusting method, using the turbine shaft gland sealing steam supply regulating device described in claim 7,
It is characterized in that, includes the following steps：
C1, cold section of hydrophobic electrically operated gate of reheating be in close in the case of, when cold section of vapor (steam) temperature value come in pipeline of reheating is low
When 220 DEG C of set lower limiting value, cold section of hydrophobic electrically operated gate of reheating is opened in the control of DCS control systems, starts to reheating cold section
The steam come in pipeline carries out hydrophobic treatment；
C2, in the case where cold section of hydrophobic electrically operated gate of reheating is in and opens, when the vapor (steam) temperature value that cold section of reheating is come in pipeline is high
When 270 DEG C of set upper limit value, the control of DCS control systems closes the hydrophobic electrically operated gate of cold section of reheating and stops carrying out reheating for cold section
Steam in pipeline carries out hydrophobic treatment.
9. turbine shaft gland sealing steam supply regulating device according to claim 1, it is characterised in that：It further includes to control with DCS and is
The auxiliary steam header thermometer that signal of uniting connects and the hydrophobic electricity of auxiliary steam header with the control connection of DCS control systems
Dynamic door；Wherein, the auxiliary steam header thermometer and the hydrophobic electrically operated gate of auxiliary steam header are arranged at auxiliary steam header
On drain water piping, the incoming end of the auxiliary steam header drain water piping carrys out pipeline with auxiliary steam header and is connected, and be located at
Before second regulating valve, the end that picks out of the auxiliary steam header drain water piping is connected to rake, for DCS control system roots
Change according to the temperature signal of auxiliary steam header thermometer, the control hydrophobic electrically operated gate of auxiliary steam header is turned on and off, will
The liquid steam that auxiliary steam header comes in pipeline is dredged to rake.
10. a kind of turbine shaft gland sealing steam supply adjusting method, using the turbine shaft gland sealing steam supply regulating device described in claim 9,
It is characterized by comprising the following steps：
D1, the hydrophobic electrically operated gate of auxiliary steam header be in close in the case of, the steam in pipeline is carried out when auxiliary steam header
When temperature value is less than 200 DEG C of set lower limiting value, the hydrophobic electrically operated gate of auxiliary steam header is opened in the control of DCS control systems, is opened
Begin to carry out auxiliary steam header the steam in pipeline and carry out hydrophobic treatment；
D2, the hydrophobic electrically operated gate of auxiliary steam header be in open in the case of, the steam in pipeline is carried out when auxiliary steam header
When temperature value is higher than 220 DEG C of set upper limit value, the hydrophobic electrically operated gate of auxiliary steam header is closed in the control of DCS control systems, is stopped
The steam only come to auxiliary steam header in pipeline carries out hydrophobic treatment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810114587.7A CN108194151B (en) | 2018-02-06 | 2018-02-06 | Steam turbine shaft seal steam supply adjusting device and method |
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| CN201810114587.7A CN108194151B (en) | 2018-02-06 | 2018-02-06 | Steam turbine shaft seal steam supply adjusting device and method |
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Cited By (5)
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| CN108999653A (en) * | 2018-08-16 | 2018-12-14 | 华电电力科学研究院有限公司 | A kind of adjustable steam extraction formula steam turbine gland seal device and its working method |
| CN113389605A (en) * | 2021-07-19 | 2021-09-14 | 西安热工研究院有限公司 | System and design method for improving steam supply safety of low-pressure shaft seal of thermal power plant |
| CN114382556A (en) * | 2021-12-28 | 2022-04-22 | 东方电气集团东方汽轮机有限公司 | Steam supply structure of steam turbine shaft seal system and adjusting method |
| CN114856724A (en) * | 2022-04-29 | 2022-08-05 | 重庆江增船舶重工有限公司 | Double-valve control system and method applied to supercritical carbon dioxide turbine |
| CN114961892A (en) * | 2022-06-17 | 2022-08-30 | 哈尔滨沃华智能电力技术有限公司 | 330MW unit steam turbine bearing seal pressure control system |
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| CN114961892A (en) * | 2022-06-17 | 2022-08-30 | 哈尔滨沃华智能电力技术有限公司 | 330MW unit steam turbine bearing seal pressure control system |
| CN114961892B (en) * | 2022-06-17 | 2023-08-22 | 哈尔滨沃华智能电力技术有限公司 | Shaft seal pressure control system of 330MW unit steam turbine |
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| CN108194151B (en) | 2024-04-09 |
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