CN112282866A - Steam turbine generator unit shaft seal steam supply pipeline heating system and control method thereof - Google Patents
Steam turbine generator unit shaft seal steam supply pipeline heating system and control method thereof Download PDFInfo
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- CN112282866A CN112282866A CN202011296425.3A CN202011296425A CN112282866A CN 112282866 A CN112282866 A CN 112282866A CN 202011296425 A CN202011296425 A CN 202011296425A CN 112282866 A CN112282866 A CN 112282866A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 94
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000010977 unit operation Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005485 electric heating Methods 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 4
- 239000002184 metal Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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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 steam turbine generator set shaft seal steam supply pipeline heating system and a control method thereof, and the steam turbine generator set shaft seal steam supply pipeline heating system comprises a high and medium pressure cylinder front shaft seal and a high and medium pressure cylinder rear shaft seal, wherein the high and medium pressure cylinder front shaft seal and the high and medium pressure cylinder rear shaft seal are respectively connected to a shaft seal main pipe through a steam inlet branch pipe I and a steam inlet branch pipe II, the steam inlet branch pipe I and the steam inlet branch pipe II are respectively provided with a control valve I and a control valve II and are respectively provided with a heating device I and a heating device II, a branch pipe I and a branch pipe II at outlet ends of the control valve I and the control valve II are respectively connected with a shaft seal steam inlet heater, a heater control valve and a steam inlet main pipe control valve, and a heater bypass valve is connected in parallel with the steam inlet heater and the heater control valve which are connected in. The invention effectively solves the problem that the rotor and the components of the steam turbine are subjected to large thermal shock when the rotor and the components are started in a warm state or a hot state due to the low temperature of the steam inlet branch pipe of the prior shaft seal system.
Description
Technical Field
The invention relates to a heating system for a steam turbine generator unit shaft seal steam supply pipeline and a control method thereof, and belongs to the technical field of heating of steam turbine generator unit shaft seal steam supply pipelines.
Background
One of the main functions of the steam turbine shaft seal system is to prevent outside cold air from entering in the starting or running stage of the unit, and prevent the steam turbine components from being rapidly cooled to influence the service life of the steam turbine. However, the temperature of the steam source of the shaft seal system needs to be matched with the metal temperature of the rotor of the steam turbine, otherwise, dynamic and static friction and vibration of the steam turbine can be caused, and even a large shaft of the steam turbine can be locked.
The two sides of each cylinder of the steam turbine are provided with shaft seal bodies, a steam source of the shaft seal generally comes from an auxiliary steam system, and when the steam source comes from the auxiliary steam system, the steam source firstly enters a main shaft seal pipe and then enters the shaft seal bodies through branch steam inlet pipes of the shaft seal. When the unit is stopped for a period of time, the shaft seal steam inlet branch pipe exchanges heat with the environment, the metal temperature of the pipe pipeline is gradually reduced, and the temperature of the steam turbine component is reduced at a much slower speed due to the large mass and the tight heat preservation of the steam turbine, so that the metal temperature of the steam turbine rotor and the temperature of the shaft seal steam inlet branch pipe have a larger temperature difference. If the shaft seal steam system is put into operation at this moment, even if the temperature of the shaft seal steam source meets the requirements, because the temperature of the shaft seal branch pipe is low, when shaft seal steam flows through the branch pipe, the shaft seal steam inevitably receives cooling temperature reduction, and large thermal shock can be caused to a steam turbine rotor and a shaft seal body, so that the safe operation of a unit is influenced.
The Chinese patent application (application number 201710502259) discloses a shaft seal steam supply system of an ultra-supercritical unit, which comprises an electric heater, wherein the electric heater is arranged on a shaft seal steam inlet branch pipe, and the purpose is to improve the steam source temperature of the steam inlet branch pipe without considering the impact of the temperature reduction of the shaft seal branch pipe on a steam turbine rotor and parts. The Chinese patent application (publication number is CN107605541A) discloses a system and a method for preventing a 1000MW ultra supercritical steam turbine steam seal shaft seal electric heater, wherein the system is provided with an electric heater on a main steam inlet pipe of a shaft seal so as to improve the steam source temperature of the main steam inlet pipe of the shaft seal, and the influence of the temperature reduction of a branch pipe of the shaft seal on a rotor and components of the steam turbine is not considered.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the utility model provides a steam turbine generator unit shaft seal steam supply pipeline heating system and a control method thereof, which aims to solve the problem that the steam turbine rotor and parts are subjected to large thermal shock when being started in a temperature state and a thermal state due to the low temperature of the steam inlet branch pipe of the high and medium pressure shaft seal of the current shaft seal system.
The technical scheme adopted by the invention is as follows: a steam turbine generator unit shaft seal supplies vapour pipeline heating system,: the steam turbine comprises a high and medium pressure cylinder front shaft seal and a high and medium pressure cylinder rear shaft seal, wherein the high and medium pressure cylinder front shaft seal and the high and medium pressure cylinder rear shaft seal are respectively connected to a shaft seal main pipe through a first steam inlet branch pipe and a second steam inlet branch pipe which are connected, a first control valve and a second control valve are respectively arranged on the first steam inlet branch pipe and the second steam inlet branch pipe, a first heating device and a second heating device are respectively arranged on the first steam inlet branch pipe and the second steam inlet branch pipe, the first heating device and the second heating device are respectively positioned between the first control valve and the high and medium pressure cylinder front shaft seal and between the second control valve and the high and medium pressure cylinder rear shaft seal, a first branch pipe 27 and a second branch pipe 28 at the outlet ends of the first control valve and the second control valve are respectively connected with a first water drainage control valve and a second drainage, a heater control valve and an air inlet main pipe control valve, and a heater bypass valve connected in parallel with the shaft seal air inlet heater and the heater control valve which are connected in series.
Preferably, the first heating device and the second heating device are respectively and completely distributed with a first control valve and a first steam inlet branch pipe between the front shaft seal of the high and medium pressure cylinder and a second control valve and a second steam inlet branch pipe between the rear shaft seal of the high and medium pressure cylinder.
Preferably, the first heating device and the second heating device are of an electric heating belt, a steam cavity or an air heat tracing pipe type;
preferably, the first heating device and the second heating device are both provided with temperature measuring devices, and the temperature measuring devices are abutted against the first steam inlet branch pipe or the second steam inlet branch pipe.
Preferably, the temperature measuring device is a thermocouple, an in-situ thermometer, or a thermal resistor.
Preferably, a shaft seal main pipe drain valve is attached to the branch pipe of the shaft seal main pipe.
Preferably, the first control valve, the second control valve, the first drain control valve and the second drain control valve are of an electric, pneumatic or manual control structure.
Preferably, the shaft seal main pipe drain valve is of an electric, pneumatic or manual control structure.
A control method for a heating system of a shaft seal steam supply pipeline of a steam turbine generator unit is used for commissioning the heating system of the shaft seal steam supply pipeline in the starting stage of the unit, and specifically comprises the following steps:
step 1, closing a first control valve and a second control valve, opening a drain valve of a shaft seal main pipe, a first drain control valve and a second drain control valve, and opening a steam inlet main pipe control valve;
step 2, when T is reachedr-Ti>Starting a heater control valve at 80 ℃, closing a bypass valve of the heater, starting a shaft seal steam inlet heater, and heating steam entering a shaft seal main pipe to meet the temperature requirement of the shaft seal main pipe; when T isr-TiWhen the temperature is less than or equal to 80 ℃, the heater control valve is closed, the heater bypass valve is opened, and steam is directly connected into the shaft seal main pipe; t isrIs rotor temperature, TiThe temperature of the steam inlet of the shaft seal main pipe is set;
In the unit operation stage, the heating system of the shaft seal steam supply pipeline comprises the following steps:
step 1, when P is epsilon (0.9P)s，1.1Ps) When the unit shaft seal system starts to enter a self-sealing state, a first heating device and a second heating device are started, P is the actual power of unit operation, and P is the actual power of the unit operationsEstablishing power for self-sealing;
step 2, when
And stopping the first heating device and the second heating device.
The invention has the beneficial effects that: compared with the prior art, the invention considers the influence of the temperature reduction of the steam inlet branch pipe pipeline of the steam turbine shaft seal system on the shaft seal system, a steam turbine rotor and other related components, and increases the high and medium pressure shaft seal steam inlet branch pipe heating device to improve the temperature of the shaft seal steam inlet branch pipe pipeline to match the metal temperature of the steam turbine rotor and the steam inlet temperature of the shaft seal, thereby effectively solving the problem that the steam turbine rotor and the components are subjected to larger thermal shock when being started in a temperature state and a thermal state due to the low temperature of the high and medium pressure shaft seal steam inlet branch pipe of the current shaft seal system, and ensuring the safe operation of the steam turbine generator set.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in figure 1, a steam turbine generator unit shaft seal steam supply pipeline heating system comprises a high and medium pressure cylinder front shaft seal 3 and a high and medium pressure cylinder rear shaft seal 17 of a steam turbine generator unit 1, wherein the high and medium pressure cylinder front shaft seal 3 and the high and medium pressure cylinder rear shaft seal 17 are respectively connected to a shaft seal main pipe 10 through a connected steam inlet branch pipe I24 and a connected steam inlet branch pipe II 25, a control valve I6 and a control valve II 7 are respectively installed on the steam inlet branch pipe I24 and the steam inlet branch pipe II 25, a heating device I4 and a heating device II 5 are respectively installed on the steam inlet branch pipe I24 and the steam inlet branch pipe II 25, the heating device I4 and the heating device II 5 are respectively located between the control valve I6 and the high and medium pressure cylinder front shaft seal 3 and between the control valve II 7 and the high and medium pressure cylinder rear 17, a branch pipe I27 and a branch pipe II 28 at the outlet ends of the control valve I6 and the control valve II 7 are respectively connected, a branch pipeline of the main shaft seal pipe 10 is sequentially connected with a shaft seal steam inlet heater 11, a heater control valve 12 and a main air inlet pipe control valve 14, a heater bypass valve 13 is connected in parallel with the shaft seal steam inlet heater 11 and the heater control valve 12 which are connected in series, the main shaft seal pipe 10 is further provided with a water spray attemperator 23, the water spray attemperator 23 is positioned behind the branch of the main shaft seal pipe 10 connected with the shaft seal steam inlet heater 11, and a shaft seal overflow valve 16 and a turbo generator set 2 are further connected behind the water spray attemperator 23 in a branch connection mode.
Preferably, the first heating device 4 and the second heating device 5 are respectively and completely filled with a first steam inlet branch pipe 24 between the control valve 6 and the front shaft seal 3 of the high and medium pressure cylinder and a second steam inlet branch pipe 25 between the control valve 7 and the rear shaft seal 17 of the high and medium pressure cylinder.
Preferably, the first heating device 4 and the second heating device 5 are of an electric heating belt, a steam cavity or an air heat tracing pipe type;
preferably, the first heating device 4 and the second heating device 5 are both provided with temperature measuring devices 26, and the temperature measuring devices 26 abut against the first steam inlet branch pipe 24 or the second steam inlet branch pipe 25.
Preferably, the temperature measuring device 26 is a thermocouple, an in-situ thermometer, or a thermal resistor.
Preferably, a shaft seal mother pipe drain valve 29 is attached to a branch pipe of the shaft seal mother pipe 10.
Preferably, the control valve I6, the control valve II 7, the drain control valve I8 and the drain control valve II 9 are of electric, pneumatic or manual control structures.
Preferably, the shaft seal main pipe drain valve 29 is of an electric, pneumatic or manual control structure.
Example 2: a control method for a heating system of a shaft seal steam supply pipeline of a steam turbine generator unit is used for commissioning the heating system of the shaft seal steam supply pipeline in the starting stage of the unit, and specifically comprises the following steps:
step 1, closing a first control valve 6 and a second control valve 7, opening a shaft seal main pipe drain valve 29, a first drain control valve 8 and a second drain control valve 9, and opening a steam inlet main pipe control valve 14;
step 2, when T is reachedr-Ti>Starting a heater control valve at 80 ℃, closing a bypass valve of the heater, starting a shaft seal steam inlet heater, and heating steam entering a shaft seal main pipe to meet the temperature requirement of the shaft seal main pipe; when T isr-TiWhen the temperature is less than or equal to 80 ℃, the heater control valve is closed, the heater bypass valve is opened, and steam is directly connected into the shaft seal main pipe; t isrIs rotor temperature, TiThe temperature of the steam inlet of the shaft seal main pipe is set;
In the unit operation stage, the heating system of the shaft seal steam supply pipeline comprises the following steps:
step 1, when P is epsilon (0.9P)s，1.1Ps) When the unit shaft seal system starts to enter a self-sealing state, a first heating device 4 and a second heating device 5 are started, P is the actual power of unit operation, and P is the actual power of the unit operationsEstablishing power for self-sealing;
step 2, when
And when the heating device I4 and the heating device II 5 are stopped.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and therefore, the scope of the present invention should be determined by the scope of the claims.
Claims (10)
1. The utility model provides a turbo generator set bearing seal supplies vapour pipeline heating system which characterized in that: the steam turbine comprises a high and medium pressure cylinder front shaft seal (3) and a high and medium pressure cylinder rear shaft seal (17), wherein the high and medium pressure cylinder front shaft seal (3) and the high and medium pressure cylinder rear shaft seal (17) are respectively connected to a shaft seal main pipe (10) through a first steam inlet branch pipe (24) and a second steam inlet branch pipe (25) which are connected, a first control valve (6) and a second control valve (7) are respectively installed on the first steam inlet branch pipe (24) and the second steam inlet branch pipe (25), a first heating device (4) and a second heating device (5) are respectively installed on the first steam inlet branch pipe (24) and the second steam inlet branch pipe (25), the first heating device (4) and the second heating device (5) are respectively positioned between the first control valve (6) and the high and medium pressure cylinder front shaft seal (3) and between the second control valve (7) and the high pressure cylinder rear shaft seal (17), a first branch pipe (27) and a second branch pipe (28) at the outlet ends of the first control valve (6) and the second control valve (7) are respectively connected with a first water, a branch pipeline of the shaft seal main pipe (10) is sequentially connected with a shaft seal steam inlet heater (11), a heater control valve (12) and a steam inlet main pipe control valve (14), and a heater bypass valve (13) is connected in parallel with the shaft seal steam inlet heater (11) and the heater control valve (12) which are connected in series.
2. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: the first heating device (4) and the second heating device (5) are respectively and completely filled with a first steam inlet branch pipe (24) between the control valve (6) and the front shaft seal (3) of the high and medium pressure cylinder and a second steam inlet branch pipe (25) between the control valve (7) and the rear shaft seal (17) of the high and medium pressure cylinder.
3. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: the first heating device (4) and the second heating device (5) are of electric heating belts, steam cavities or air heat tracing pipes;
4. the steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: and the first heating device (4) and the second heating device (5) are both provided with temperature measuring devices (26), and the temperature measuring devices (26) are abutted against the first steam inlet branch pipe (24) or the second steam inlet branch pipe (25).
5. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 4, wherein: the temperature measuring device (26) is a thermocouple, an in-situ thermometer, or a thermal resistor.
6. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: a branch pipe of the shaft seal main pipe (10) is provided with a shaft seal main pipe drain valve (29).
7. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: the control valve I (6), the control valve II (7), the drain control valve I (8) and the drain control valve II (9) are of electric, pneumatic or manual control structures.
8. The steam turbine generator unit shaft seal steam supply pipeline heating system of claim 1, wherein: the shaft seal main pipe drain valve (29) is of an electric, pneumatic or manual control structure.
9. The control method of the steam turbine generator unit shaft seal steam supply pipeline heating system according to any one of claims 1 to 8, characterized in that: the method is used for commissioning a shaft seal steam supply pipeline heating system in a unit starting stage, and specifically comprises the following steps:
step 1, closing a first control valve (6) and a second control valve (7), opening a shaft seal main pipe drain valve (29), a first drain control valve (8) and a second drain control valve (9), and opening a steam inlet main pipe control valve (14);
step 2, when T is reachedr-Ti>The heater control valve (12) is opened at 80 ℃, the heater bypass valve (13) is closed, the shaft seal steam inlet heater (11) is started, and steam entering the shaft seal main pipe is heated to meet the temperature requirement of the shaft seal main pipe; when T isr-TiWhen the temperature is less than or equal to 80 ℃, the heater control valve (12) is closed, the heater bypass valve (13) is opened, and steam is directly connected into the shaft seal main pipe; t isrIs rotor temperature, TiThe temperature of the steam inlet of the shaft seal main pipe is set;
step 3, when T is reachedr-Tw>90 ℃ or TwWhen the temperature is less than 100 ℃, a first heating device (4) and a second heating device (5) are put into operation, TwThe lower value of the pipe wall temperature of the first steam inlet branch pipe (24) or the second steam inlet branch pipe (25);
step 4, whenTr-Tm≤90℃、Tr-Tw≤90℃、tr>When the requirement is met in 20min, a first control valve (6) and a second control valve (7) are opened, shaft seal steam is fed into a front shaft seal (3) of the high and medium pressure cylinder and a rear shaft seal (17) of the high and medium pressure cylinder, and TmIs the temperature of the shaft seal mother tube, trThe running time of the first heating device (4) and the second heating device (5) needs to meet the conditions in the step;
step 5, when t is reachedo>Closing the first heating device (4) and the second heating device (5) in operation at 20min, toThe full opening time of the control valve I (6) and the control valve II (7) is adopted.
10. The control method of the steam turbine generator unit shaft seal steam supply pipeline heating system according to claim 9, characterized in that: in the unit operation stage, the heating system of the shaft seal steam supply pipeline comprises the following steps:
step 1, when P is epsilon (0.9P)s，1.1Ps) When the unit shaft seal system starts to enter a self-sealing state, a first heating device (4) and a second heating device (5) are started, P is the actual power of unit operation, and P is the actual power of the unit operationsEstablishing power for self-sealing;
step 2, when
And when the heating device I (4) and the heating device II (5) are stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296425.3A CN112282866A (en) | 2020-11-18 | 2020-11-18 | Steam turbine generator unit shaft seal steam supply pipeline heating system and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296425.3A CN112282866A (en) | 2020-11-18 | 2020-11-18 | Steam turbine generator unit shaft seal steam supply pipeline heating system and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
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