CN114575943B - Shaft seal electric heater control system and method for shaft seal system of ultra-supercritical unit - Google Patents
Shaft seal electric heater control system and method for shaft seal system of ultra-supercritical unit Download PDFInfo
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- CN114575943B CN114575943B CN202210327204.0A CN202210327204A CN114575943B CN 114575943 B CN114575943 B CN 114575943B CN 202210327204 A CN202210327204 A CN 202210327204A CN 114575943 B CN114575943 B CN 114575943B
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000004781 supercooling Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 description 7
- 230000002209 hydrophobic effect Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
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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
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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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
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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
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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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 shaft seal electric heater control system and a shaft seal electric heater control method for a shaft seal system of an ultra-supercritical unit, wherein an outlet of an auxiliary steam header is communicated with an inlet of a front electric valve of a shaft seal electric heater and an inlet of a bypass electric valve of the shaft seal electric heater; the outlet of the shaft seal electric heater is provided with a first temperature measuring point T 1 The inlet of the auxiliary steam supply shaft seal electric valve is provided with a second temperature measuring point T 2 The system and the method can ensure the safe, reliable and economic operation of the shaft seal system.
Description
Technical Field
The invention belongs to the technical field of turbine shaft seal electric heaters, and relates to a shaft seal electric heater control system and method of a shaft seal system of an ultra-supercritical unit.
Background
The shaft seal system is an important component part of the steam turbine, and has the function of preventing high-temperature and high-pressure steam from leaking out of the cylinder to cause heat loss for a high-pressure area; for the low pressure area, the function is to prevent air from leaking into the vacuum part of the cylinder, and ensure the high-efficiency operation of the unit. The shaft seal system has strict requirements on steam supply temperature and pressure, so that the shaft seal of the steam turbine cannot generate excessive thermal stress, and large shaft bending caused by supercooling or superheated steam entering is prevented.
For the ultra-supercritical unit, because the unit capacity is large, the operation parameters are high, and auxiliary equipment is numerous, the requirements on the safety and stability of the operation of the shaft seal system are higher. Therefore, the shaft seal steam supply part is provided with the shaft seal electric heater to ensure steam supply temperature, but the problem of frequent fault tripping of the electric heater caused by heating overtemperature exists in the operation process. Therefore, optimizing the control method of the electric heater of the shaft seal of the ultra-supercritical unit is necessary to ensure the safe, reliable and economical operation of the shaft seal system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a shaft seal electric heater control system and a shaft seal electric heater control method for a shaft seal system of an ultra-supercritical unit, which can ensure safe, reliable and economical operation of the shaft seal system.
In order to achieve the purpose, the control system of the shaft seal electric heater of the ultra-supercritical unit shaft seal system comprises a controller, an auxiliary steam header, a shaft seal electric heater front electric valve, a shaft seal electric heater bypass electric valve, a shaft seal electric heater, an auxiliary steam supply shaft seal bypass electric valve, a shaft seal steam main pipe, an auxiliary steam supply shaft seal regulating valve and an auxiliary steam supply shaft seal electric valve;
the outlet of the auxiliary steam header is communicated with the inlet of the front electric valve of the shaft seal electric heater and the inlet of the bypass electric valve of the shaft seal electric heater, the outlet of the front electric valve of the shaft seal electric heater is divided into two paths after passing through the shaft seal electric heater and the outlet of the bypass electric valve of the shaft seal electric heater through a pipeline, one path is communicated with the main pipe of the shaft seal steam through the auxiliary steam supply bypass electric valve, and the other path is communicated with the main pipe of the shaft seal steam through the auxiliary steam supply shaft seal electric valve and the auxiliary steam supply shaft seal regulating valve;
the outlet of the shaft seal electric heater is provided with a first temperature measuring point T 1 The inlet of the auxiliary steam supply shaft seal electric valve is provided with a second temperature measuring point T 2 ；
Controller and first temperature measuring point T 1 Second temperature measuring point T 2 The shaft seal electric heater, the auxiliary steam supply shaft seal electric valve, the auxiliary steam supply shaft seal regulating valve, the shaft seal electric heater bypass electric valve and the auxiliary steam supply shaft seal bypass electric valve are connected.
The ultra-supercritical unit shaft seal system comprises a shaft seal steam box, an auxiliary steam header, a high-pressure cylinder, a medium-pressure cylinder, a first low-pressure cylinder and a second low-pressure cylinder, wherein a shaft seal steam inlet of the high-pressure cylinder, a shaft seal steam inlet of the medium-pressure cylinder, a shaft seal steam inlet of the first low-pressure cylinder and a shaft seal steam inlet of the second low-pressure cylinder are all communicated with the shaft seal steam box, and a shaft seal steam outlet of the high-pressure cylinder, a shaft seal steam outlet of the medium-pressure cylinder, a shaft seal steam outlet of the first low-pressure cylinder and a shaft seal steam outlet of the second low-pressure cylinder are all communicated with the shaft seal steam box.
Manual valves are arranged between the shaft seal steam return main pipe and the shaft seal steam outlet of the high-pressure cylinder, between the shaft seal steam outlet of the medium-pressure cylinder and the shaft seal steam outlet of the first low-pressure cylinder, and between the shaft seal steam return main pipe and the shaft seal steam outlet of the second low-pressure cylinder.
The device also comprises a shaft seal heater; the outlet of the shaft seal steam return main pipe is connected with a shaft seal heater.
The device also comprises a drainage pipeline and a drainage header pipe; the drain outlet of the shaft seal steam main pipe is communicated with a drain pipeline, a drain pneumatic valve of the shaft seal steam main pipe is arranged on the drain pipeline, and the outlet of the water conveying pipeline is communicated with a drain header pipe.
The low-pressure heating device further comprises a shaft seal overflow regulating valve, a shaft seal overflow to condenser electric valve, a shaft seal overflow to low-pressure heater electric valve, a condenser and a low-pressure heater;
the shaft seal steam main pipe is communicated with one end of the shaft seal overflow regulating valve, the other end of the shaft seal overflow regulating valve is connected with one end of the shaft seal overflow to the condenser electric valve and one end of the shaft seal overflow to the low-pressure heater electric valve, the other end of the shaft seal overflow to the condenser electric valve is connected with the condenser, and the other end of the shaft seal overflow to the low-pressure heater electric valve is connected with the low-pressure heater.
The device also comprises an adjacent auxiliary steam header and a cold re-steam pipeline, wherein the outlet of the adjacent auxiliary steam header and the outlet of the cold re-steam pipeline are communicated with the inlet of the auxiliary steam header.
The control method of the shaft seal electric heater of the shaft seal system of the ultra-supercritical unit comprises the following steps:
setting an upper limit value and a lower limit value of temperature protection before the auxiliary steam supply shaft seal electric valve, and when the temperature value at the second temperature measuring point is higher than the upper limit value of temperature protection before the auxiliary steam supply shaft seal electric valve or lower than the lower limit value of temperature protection before the auxiliary steam supply shaft seal electric valve, automatically closing the auxiliary steam supply shaft seal electric valve to prevent supercooling or overheat steam from entering a shaft seal steam main pipe;
in the process of starting up and loading up the unit, the shaft seal electric heater is in a closing state, two curves of the shaft seal steam supply temperature along with the change of the rotor temperature are arranged in the controller, one curve represents the upper limit temperature of operation, the other curve represents the lower limit temperature of operation, a starting temperature value of the shaft seal electric heater is set to be the lower limit temperature value of operation plus a temperature offset value, when the temperature at the second temperature measuring point is smaller than the starting temperature of the shaft seal electric heater, the shaft seal electric heater is started, and the steam supply temperature of the shaft seal electric heater when being started is ensured to be higher than the lower limit temperature of operation;
and reducing the maximum heating power of the shaft seal electric heater, setting a temperature value of an outlet of the shaft seal electric heater = an operation lower limit temperature value + a temperature offset value, setting a stop temperature value of the shaft seal electric heater = an outlet temperature value + a temperature offset value of the shaft seal electric heater, and when the temperature at the first temperature measuring point is greater than the stop temperature value of the shaft seal electric heater, automatically stopping the shaft seal electric heater to work, so that the residual heating power of the shaft seal electric heater is ensured not to heat the temperature to a temperature protection value of the outlet of the shaft seal electric heater, and avoiding fault tripping of the shaft seal electric heater.
The invention has the following beneficial effects:
when the control system and the method for the shaft seal electric heater of the shaft seal system of the ultra-supercritical unit are specifically operated, the temperature at the outlet of the shaft seal electric heater is monitored through the first temperature measuring point, the temperature before the auxiliary steam supply shaft seal electric valve is monitored through the second temperature measuring point, the auxiliary steam supply shaft seal electric valve and the shaft seal electric heater are controlled through the monitoring, and meanwhile parameters of the shaft seal electric heater are adjusted, so that the safety and stability of the operation of the shaft seal steam supply system are ensured, the problem that the shaft seal electric heater frequently trips due to heating overtemperature of the shaft seal electric heater is effectively solved, and the safe, reliable and economic operation of the shaft seal system is ensured.
Drawings
Fig. 1 is a schematic structural view of the present invention.
The device comprises a high-pressure cylinder 1, a medium-pressure cylinder 2, a first low-pressure cylinder 3, a second low-pressure cylinder 4, an auxiliary steam header 5, a shaft seal electric heater 6, a shaft seal electric heater front electric valve 7, a shaft seal electric heater bypass electric valve 8, an auxiliary steam supply shaft seal electric valve 9, an auxiliary steam supply shaft seal regulating valve 10, an auxiliary steam supply shaft seal regulating valve 11, a shaft seal overflow regulating valve 12, a shaft seal overflow to condenser electric valve 13, a shaft seal overflow to low-pressure heater electric valve 14, a shaft seal steam main pipe hydrophobic pneumatic valve 15, a shaft seal heater 16, a neighboring machine auxiliary steam header 17, a cold steam pipeline 18, a condenser 19, a low-pressure heater 20 and a hydrophobic header 21.
Detailed Description
In order to make the present invention better understood by those skilled in the art, the following description will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments, but not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the accompanying drawings, there is shown a schematic structural diagram in accordance with a disclosed embodiment of the invention. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and their relative sizes, positional relationships shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
Referring to fig. 1, the control system for the shaft seal electric heater of the ultra-supercritical unit shaft seal system comprises a high-pressure cylinder 1, a medium-pressure cylinder 2, a first low-pressure cylinder 3, a second low-pressure cylinder 4, an auxiliary steam header 5, a shaft seal electric heater 6, a shaft seal electric heater front electric valve 7, a shaft seal electric heater bypass electric valve 8, an auxiliary steam supply shaft seal electric valve 9, a 1 auxiliary steam supply shaft seal regulating valve 10, an auxiliary steam supply shaft seal bypass electric valve 11, a shaft seal overflow regulating valve 12, a shaft seal overflow to condenser electric valve 13, a shaft seal overflow to low-pressure heater electric valve 14, a shaft seal steam main pipe hydrophobic pneumatic valve 15, a shaft seal heater 16, an adjacent machine auxiliary steam header 17, a cold re-steam pipeline 18, a condenser 19, a low-pressure heater 20 and a hydrophobic header 21;
the ultra-supercritical unit shaft seal system comprises an auxiliary steam header 5, a high pressure cylinder 1, a middle pressure cylinder 2, a first low pressure cylinder 3 and a second low pressure cylinder 4, wherein a shaft seal steam inlet of the high pressure cylinder 1, a shaft seal steam inlet of the middle pressure cylinder 2, a shaft seal steam inlet of the first low pressure cylinder 3 and a shaft seal steam inlet of the second low pressure cylinder 4 are communicated with a shaft seal steam mother pipe, a shaft seal steam outlet of the high pressure cylinder 1, a shaft seal steam outlet of the middle pressure cylinder 2, a shaft seal steam outlet of the first low pressure cylinder 3 and a shaft seal steam outlet of the second low pressure cylinder 4 are communicated with a shaft seal steam return mother pipe, the seal steam box is characterized in that a manual valve is arranged between a seal steam box return main pipe and a seal steam outlet of the high-pressure cylinder 1, between a seal steam outlet of the medium-pressure cylinder 2 and a seal steam outlet of the first low-pressure cylinder 3 and a seal steam outlet of the second low-pressure cylinder 4, an outlet of the seal steam box return main pipe is connected with a seal heater 16, a drain outlet of the seal steam box main pipe is communicated with a drain pipeline, a seal steam main pipe drain pneumatic valve 15 is arranged on the drain pipeline, and an outlet of a water delivery pipeline is communicated with a drain header 21;
the outlet of the adjacent auxiliary steam header 17 and the outlet of the cold re-steam pipeline 18 are communicated with the inlet of the auxiliary steam header 5, the outlet of the auxiliary steam header 5 is communicated with the inlet of the shaft seal electric heater front electric valve 7 and the inlet of the shaft seal electric heater bypass electric valve 8, the outlet of the shaft seal electric heater front electric valve 7 is communicated with the outlet of the shaft seal electric heater bypass electric valve 8 after passing through the shaft seal electric heater 6, and is divided into two paths after being connected through a pipeline, one path is communicated with a shaft seal steam main pipe through the auxiliary steam supply shaft seal bypass electric valve 11, and the other path is communicated with the shaft seal steam main pipe through the auxiliary steam supply shaft seal electric valve 9 and the auxiliary steam supply shaft seal regulating valve 10;
the gland steam main pipe is communicated with one end of the gland overflow regulating valve 12, the other end of the gland overflow regulating valve 12 is connected with one end of the gland overflow to the condenser electric valve 13 and one end of the gland overflow to the low-pressure heater electric valve 14, the other end of the gland overflow to the condenser electric valve 13 is connected with the condenser 19, and the other end of the gland overflow to the low-pressure heater electric valve 14 is connected with the low-pressure heater 20.
Wherein, a first temperature measuring point T is arranged at the outlet of the shaft seal electric heater 6 1 The inlet of the auxiliary steam supply shaft seal electric valve 9 is provided with a second temperature measuring point T 2 。
Controller and first temperature measuring point T 1 Second temperature measuring point T 2 The auxiliary steam supply shaft seal electric valve 9, the auxiliary steam supply shaft seal regulating valve 10, the shaft seal electric heater bypass electric valve 8 and the auxiliary steam supply shaft seal bypass electric valve 11 are connected.
The operation method of the control system of the shaft seal electric heater of the shaft seal system of the ultra-supercritical unit comprises the following steps:
1) The states of the shaft seal electric heater 6 comprise a closing state, a separating state and a fault tripping state, and an outlet temperature value, a starting temperature value and a stopping working temperature value of the shaft seal electric heater 6 are arranged in the controller;
2) Setting an upper limit value and a lower limit value of temperature protection before the auxiliary steam supply shaft seal electric valve 9, and when the temperature value at the second temperature measuring point is higher than the upper limit value of temperature protection before the auxiliary steam supply shaft seal electric valve 9 or lower than the lower limit value of temperature protection before the auxiliary steam supply shaft seal electric valve 9, automatically closing the auxiliary steam supply shaft seal electric valve 9 to prevent supercooling or overheat steam from entering a shaft seal steam main pipe;
3) In the process of starting and loading the unit, the shaft seal electric heater 6 is in a closing state, two curves of the shaft seal steam supply temperature along with the change of the rotor temperature are arranged in the controller, one curve represents the upper limit temperature of operation, the other curve represents the lower limit temperature of operation, the starting temperature value of the shaft seal electric heater 6 = the lower limit temperature value of operation + the temperature offset value is set, the temperature offset value is 5-15 ℃, when the temperature at the second temperature measuring point is smaller than the starting temperature of the shaft seal electric heater 6, the shaft seal electric heater 6 is started, and the steam supply temperature when the shaft seal electric heater 6 is started is ensured to be higher than the lower limit temperature of operation;
4) The maximum heating power of the shaft seal electric heater 6 is reduced, for example, the maximum heating power of the shaft seal electric heater 6 is reduced from the rated power to 80% of the rated power, and the temperature protection value of the outlet of the shaft seal electric heater 6 is set to 350 ℃ so as to protect equipment from damage. Setting the temperature value of the outlet of the shaft seal electric heater 6 = the lower limit temperature value of operation + the temperature offset value, wherein the temperature offset value is modified and flexibly adjusted at any time according to the running condition of the unit, and can ensure that the temperature value of the outlet of the shaft seal electric heater 6 is larger than the starting temperature value of the shaft seal electric heater 6, and because the temperature at the second temperature measuring point is slightly lower than the temperature at the first temperature measuring point, the stopping temperature value of the shaft seal electric heater 6 = the outlet temperature value of the shaft seal electric heater 6 + the temperature offset value is set, the temperature offset value is 5-15 ℃, the shaft seal electric heater 6 is ensured to heat the shaft seal steam supply to a sufficient temperature, and when the temperature at the first temperature measuring point is larger than the stopping temperature value of the shaft seal electric heater 6, the shaft seal electric heater 6 automatically stops working, and the residual heating power of the shaft seal electric heater 6 is ensured not to heat the temperature to the temperature protection value of the outlet of the shaft seal electric heater 6, so that the fault tripping of the shaft seal electric heater 6 is avoided.
The present invention is applicable to, but not limited to, ultra supercritical units, and all of the above description sets forth the basic principles, main features, and advantages of the present invention. The present invention is not limited by the above embodiments, which are merely illustrative of the principles of the present invention. The invention is subject to various changes and modifications in the actual design construction process, which are all within the scope of the invention as claimed.
Claims (3)
1. The shaft seal electric heater control system of the ultra-supercritical unit shaft seal system is characterized by comprising a controller, an auxiliary steam header (5), a shaft seal electric heater front electric valve (7), a shaft seal electric heater bypass electric valve (8), a shaft seal electric heater (6), an auxiliary steam supply shaft seal bypass electric valve (11), a shaft seal steam main pipe, an auxiliary steam supply shaft seal regulating valve (10) and an auxiliary steam supply shaft seal electric valve (9);
the outlet of the auxiliary steam header (5) is communicated with the inlet of the front electric valve (7) of the shaft seal electric heater and the inlet of the bypass electric valve (8) of the shaft seal electric heater, the outlet of the front electric valve (7) of the shaft seal electric heater is connected with the outlet of the bypass electric valve (8) of the shaft seal electric heater through the shaft seal electric heater (6) and then is divided into two paths through a pipeline, one path is communicated with a main shaft seal steam pipe through the auxiliary steam supply shaft seal bypass electric valve (11), and the other path is communicated with the main shaft seal steam pipe through the auxiliary steam supply shaft seal electric valve (9) and the auxiliary steam supply shaft seal regulating valve (10);
the outlet of the shaft seal electric heater (6) is provided with a first temperature measuring point T 1 The inlet of the auxiliary steam supply shaft seal electric valve (9) is provided with a second temperature measuring point T 2 ；
Controller and first temperature measuring point T 1 Second temperature measuring point T 2 The auxiliary steam supply shaft seal electric valve (9), the auxiliary steam supply shaft seal regulating valve (10), the shaft seal electric heater bypass electric valve (8) and the auxiliary steam supply shaft seal bypass electric valve (11) are connected;
the ultra-supercritical unit shaft seal system comprises a shaft seal steam box, an auxiliary steam header (5), a high-pressure cylinder (1), a middle-pressure cylinder (2), a first low-pressure cylinder (3) and a second low-pressure cylinder (4), wherein a shaft seal steam inlet of the high-pressure cylinder (1), a shaft seal steam inlet of the middle-pressure cylinder (2), a shaft seal steam inlet of the first low-pressure cylinder (3) and a shaft seal steam inlet of the second low-pressure cylinder (4) are all communicated with the shaft seal steam box, and a shaft seal steam outlet of the high-pressure cylinder (1), a shaft seal steam outlet of the middle-pressure cylinder (2), a shaft seal steam outlet of the first low-pressure cylinder (3) and a shaft seal steam outlet of the second low-pressure cylinder (4) are all communicated with the shaft seal steam box;
manual valves are arranged between the shaft seal steam return main pipe and the shaft seal steam outlet of the high-pressure cylinder (1), between the shaft seal steam outlet of the medium-pressure cylinder (2), between the shaft seal steam outlet of the first low-pressure cylinder (3) and the shaft seal steam outlet of the second low-pressure cylinder (4);
also comprises a shaft seal heater (16); the outlet of the shaft seal steam return main pipe is connected with a shaft seal heater (16);
the device also comprises a drainage pipeline and a drainage header pipe (21); the drain outlet of the shaft seal steam main pipe is communicated with a drain pipeline, a drain pneumatic valve (15) of the shaft seal steam main pipe is arranged on the drain pipeline, and the outlet of the water conveying pipeline is communicated with a drain header (21);
the low-pressure condenser also comprises a shaft seal overflow regulating valve (12), a shaft seal overflow to condenser electric valve (13), a shaft seal overflow to low-pressure heater electric valve (14), a condenser (19) and a low-pressure heater (20);
the seal steam main pipe is communicated with one end of a seal overflow regulating valve (12), the other end of the seal overflow regulating valve (12) is connected with one end of a seal overflow to a condenser electric valve (13) and one end of a seal overflow to a low-pressure heater electric valve (14), the other end of the seal overflow to the condenser electric valve (13) is connected with a condenser (19), and the other end of the seal overflow to the low-pressure heater electric valve (14) is connected with a low-pressure heater (20).
2. The control system of the shaft seal electric heater of the shaft seal system of the ultra-supercritical unit according to claim 1, further comprising an adjacent auxiliary steam header (17) and a cold re-steam pipeline (18), wherein the outlet of the adjacent auxiliary steam header (17) and the outlet of the cold re-steam pipeline (18) are communicated with the inlet of the auxiliary steam header (5).
3. The control method for the electric heater of the shaft seal system of the ultra-supercritical unit shaft seal system is characterized by comprising the following steps of:
setting an upper limit value and a lower limit value of temperature protection before the auxiliary steam-supply shaft seal electric valve (9), and when the temperature value at the second temperature measuring point is higher than the upper limit value of temperature protection before the auxiliary steam-supply shaft seal electric valve (9) or lower than the lower limit value of temperature protection before the auxiliary steam-supply shaft seal electric valve (9), automatically closing the auxiliary steam-supply shaft seal electric valve (9) to prevent supercooling or overheat steam from entering a shaft seal steam main pipe;
in the process of starting up and loading up the unit, the shaft seal electric heater (6) is in a closing state, two curves of the shaft seal steam supply temperature along with the change of the rotor temperature are arranged in the controller, one curve represents the upper limit temperature of operation, the other curve represents the lower limit temperature of operation, the starting temperature value of the shaft seal electric heater (6) is set to be = the lower limit temperature value of operation + the temperature offset value, and when the temperature at the second temperature measuring point is smaller than the starting temperature of the shaft seal electric heater (6), the shaft seal electric heater (6) is started, so that the steam supply temperature of the shaft seal electric heater (6) is ensured to be higher than the lower limit temperature of operation;
and reducing the maximum heating power of the shaft seal electric heater (6), setting the temperature value of the outlet of the shaft seal electric heater (6) =the lower limit temperature value of operation+the temperature offset value, setting the stop temperature value of the shaft seal electric heater (6) =the outlet temperature value of the shaft seal electric heater (6) +the temperature offset value, and when the temperature at the first temperature measuring point is greater than the stop temperature value of the shaft seal electric heater (6), automatically stopping the shaft seal electric heater (6) to work, so that the residual heating power of the shaft seal electric heater (6) is ensured to not heat the temperature to the temperature protection value of the outlet of the shaft seal electric heater (6), and fault tripping of the shaft seal electric heater (6) is avoided.
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| CN202210327204.0A CN114575943B (en) | 2022-03-30 | 2022-03-30 | Shaft seal electric heater control system and method for shaft seal system of ultra-supercritical unit |
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| CN202210327204.0A CN114575943B (en) | 2022-03-30 | 2022-03-30 | Shaft seal electric heater control system and method for shaft seal system of ultra-supercritical unit |
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| CN115788606A (en) * | 2022-12-15 | 2023-03-14 | 东方电气集团东方汽轮机有限公司 | Heat accumulating type shaft seal electric heating system and control method |
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| SU1430559A1 (en) * | 1984-06-08 | 1988-10-15 | Производственное Объединение Турбостроения "Ленинградский Металлический Завод" | Apparatus for automatically maintaining the permissible load variation of turbine |
| JP2001090507A (en) * | 1999-09-24 | 2001-04-03 | Hitachi Ltd | Electric power plant |
| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN107605541A (en) * | 2017-09-27 | 2018-01-19 | 山东中实易通集团有限公司 | Prevent 1000MW supercritical turbine packings from seizing axle envelope electric heater system and method |
| CN207960693U (en) * | 2017-12-29 | 2018-10-12 | 嘉峪关大友嘉能化工有限公司 | A kind of steam heat-exchanging recovery system of steam turbine oil sealing |
| CN210239756U (en) * | 2019-06-11 | 2020-04-03 | 上海电气电站设备有限公司 | Steam seal steam supply system of nuclear power unit containing electric heater |
| CN214007246U (en) * | 2020-11-18 | 2021-08-20 | 贵州创星电力科学研究院有限责任公司 | Steam turbine generator unit shaft seal steam supply pipeline heating system |
| CN113431646A (en) * | 2021-07-02 | 2021-09-24 | 华能巢湖发电有限责任公司 | Auxiliary-steam-free isolated thermal state starting method for condensing type external heat supply unit |
| CN113446074A (en) * | 2021-07-19 | 2021-09-28 | 西安热工研究院有限公司 | System and method for improving steam supply, water spraying and atomizing effects of low-pressure shaft seal of steam turbine by using auxiliary atomized steam |
| CN113404551A (en) * | 2021-07-20 | 2021-09-17 | 西安热工研究院有限公司 | Shaft seal steam supply system of gas-steam combined cycle heat supply unit and operation method |
| CN215170218U (en) * | 2021-07-22 | 2021-12-14 | 上海大屯能源股份有限公司江苏分公司 | Novel electric heating device for shaft seal steam supply of unit-made steam turbine set |
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