CN114575943A - Control system and method for shaft seal electric heater of shaft seal system of ultra-supercritical unit - Google Patents
Control system and method for shaft seal electric heater of shaft seal system of ultra-supercritical unit Download PDFInfo
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- CN114575943A CN114575943A CN202210327204.0A CN202210327204A CN114575943A CN 114575943 A CN114575943 A CN 114575943A CN 202210327204 A CN202210327204 A CN 202210327204A CN 114575943 A CN114575943 A CN 114575943A
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- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
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- 238000013021 overheating Methods 0.000 description 1
- 230000008646 thermal stress Effects 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
- 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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Abstract
The invention discloses a control system and a method for a shaft seal electric heater of 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 the shaft seal electric heater and an inlet of a bypass electric valve of the shaft seal electric heater; a first temperature measuring point T is arranged at the outlet of the shaft seal electric heater1A second temperature measuring point T is arranged at the inlet of the auxiliary steam supply shaft seal electric valve2The system and the method can ensure the safety of the shaft seal systemFully reliable and economic operation.
Description
Technical Field
The invention belongs to the technical field of steam turbine shaft seal electric heaters, and relates to a system and a method for controlling a shaft seal electric heater of a shaft seal system of an ultra-supercritical unit.
Background
The shaft seal system is an important component 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 excessive thermal stress cannot be generated at the shaft seal of the steam turbine, and large shaft bending caused by the entrance of overcooling or overheating steam is prevented.
As for the ultra-supercritical unit, the unit has large capacity, high operation parameters and a plurality of auxiliary devices, higher requirements are provided for the safety and the stability of the operation of the shaft seal system. Therefore, the shaft seal steam supply part is provided with the shaft seal electric heater to ensure the steam supply temperature, but the problem of frequent fault tripping of the electric heater caused by heating overtemperature exists in the operation process. Therefore, it is necessary to optimize the control method of the shaft seal electric heater of the ultra-supercritical unit and ensure the safe, reliable and economic operation of the shaft seal system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a control system and a control method for an electric heater of a shaft seal system of an ultra-supercritical unit, wherein the system and the method can ensure the safe, reliable and economic operation of the shaft seal system.
In order to achieve the purpose, the shaft seal electric heater control system of the ultra-supercritical unit shaft seal system comprises a controller, an auxiliary steam header, a front electric valve of the shaft seal electric heater, a bypass electric valve of the shaft seal electric heater, a shaft seal electric heater, an auxiliary steam supply bypass electric valve, a main steam pipe of the shaft seal, 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 communicated with the outlet of the bypass electric valve of the shaft seal electric heater through the shaft seal electric heater and then is divided into two paths through a pipeline and a pipe, wherein one path is communicated with the main steam pipe of the shaft seal through the auxiliary steam supply bypass electric valve, and the other path is communicated with the main steam pipe of the shaft seal through the auxiliary steam supply shaft seal electric valve and the auxiliary steam supply shaft seal regulating valve;
a first temperature measuring point T is arranged at the outlet of the shaft seal electric heater1A second temperature measuring point T is arranged at the inlet of the auxiliary steam supply shaft seal electric valve2；
Controller and first temperature measuring point T1A second temperature measuring point T2The 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 return main pipe, an auxiliary steam header, a high-pressure cylinder, an intermediate-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 intermediate-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 communicated with the shaft seal steam main pipe, and a shaft seal steam outlet of the high-pressure cylinder, a shaft seal steam outlet of the intermediate-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 communicated with the shaft seal steam return main pipe.
And manual valves are arranged between the shaft seal steam return main pipe and the shaft seal steam outlet of the high-pressure cylinder, the shaft seal steam outlet of the intermediate-pressure cylinder, the shaft seal steam outlet of the first low-pressure cylinder and the shaft seal steam outlet of the second low-pressure cylinder.
Also includes 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 drain pipeline and a drain collecting 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 collecting pipe.
The device also 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 female pipe of bearing seal steam is linked together with the one end of bearing seal overflow governing valve, and the other end of bearing seal overflow governing valve is connected to the one end of condenser motorised valve and the one end of bearing seal overflow to low pressure feed water heater motorised valve with the bearing seal overflow, and the other end that the bearing seal overflow arrived condenser motorised valve links to each other with the condenser, and the other end that the bearing seal overflow arrived low pressure feed water heater motorised valve links to each other with low pressure feed water heater.
The system also comprises an adjacent machine auxiliary steam header and a cold re-steam pipeline, wherein the outlet of the adjacent machine auxiliary steam header and the outlet of the cold re-steam pipeline are communicated with the inlet of the auxiliary steam header.
The invention relates to a control method of an electric heater for a shaft seal of a shaft seal system of an ultra-supercritical unit, which 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 automatically closing the auxiliary steam supply shaft seal electric valve 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, so as to prevent overcooled or overheated steam from entering a shaft seal steam main pipe;
before and after the unit is started and in the load increasing process, the shaft seal electric heater is in a switching-on state, two curves of which the shaft seal steam supply temperature changes along with the rotor temperature are arranged in the controller, one curve represents the operation upper limit temperature, the other curve represents the operation lower limit temperature, the starting temperature value of the shaft seal electric heater is set to be the operation lower limit temperature value plus the temperature offset value, when the temperature at the second temperature measuring point is lower than the starting temperature of the shaft seal electric heater, the shaft seal electric heater is started, and the steam supply temperature when the shaft seal electric heater is started is higher than the operation lower limit temperature;
the maximum heating power of the shaft seal electric heater is reduced, the temperature value of the outlet of the shaft seal electric heater is set to be the operation lower limit temperature value and the temperature offset value, the stop temperature value of the shaft seal electric heater is set to be the outlet temperature value and the temperature offset value of the shaft seal electric heater, when the temperature of the first temperature measuring point is greater than the stop temperature value of the shaft seal electric heater, the shaft seal electric heater automatically stops working, the residual heating power of the shaft seal electric heater is guaranteed not to heat the temperature to the temperature protection value of the outlet of the shaft seal electric heater, and the shaft seal electric heater is prevented from tripping due to faults.
The invention has the following beneficial effects:
when the control system and the control 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 in front of 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 according to the temperature, and meanwhile, the parameters of the shaft seal electric heater are adjusted, so that the safety and the stability of the operation of the shaft seal steam supply system are ensured, the problem of frequent fault tripping of the shaft seal electric heater due to the fact that the shaft seal electric heater is heated to be over-temperature is effectively solved, and the safe, reliable and economic operation of the shaft seal system is ensured.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a high pressure cylinder, 2 is a middle pressure cylinder, 3 is a first low pressure cylinder, 4 is a second low pressure cylinder, 5 is an auxiliary steam header, 6 is a shaft seal electric heater, 7 is a front electric valve of the shaft seal electric heater, 8 is an electric valve of a shaft seal electric heater bypass, 9 is an electric valve of an auxiliary steam supply shaft seal, 10 is an auxiliary steam supply shaft seal regulating valve, 11 is an electric valve of an auxiliary steam supply shaft seal bypass, 12 is a shaft seal overflow regulating valve, 13 is an electric valve of a shaft seal overflow to a condenser, 14 is an electric valve of a shaft seal overflow to a low pressure heater, 15 is a water drainage pneumatic valve of a shaft seal steam main pipe, 16 is a shaft seal heater, 17 is an adjacent auxiliary steam header, 18 is a cold re-steam pipeline, 19 is a condenser, 20 is a low pressure heater, and 21 is a water drainage header.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the shaft seal electric heater control system of the shaft seal system of the ultra supercritical unit includes a high pressure cylinder 1, an intermediate 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 water drainage 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 water drainage header 21;
the shaft seal system of the ultra-supercritical unit comprises an auxiliary steam header 5, a high-pressure cylinder 1, an intermediate-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 intermediate-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 main pipe, a shaft seal steam outlet of the high-pressure cylinder 1, a shaft seal steam outlet of the intermediate-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 the shaft seal steam return main pipe, a shaft seal manual valve is arranged among the shaft seal steam return main pipe, the steam outlet of the high-pressure cylinder 1, the steam outlet of the intermediate-pressure cylinder 2, 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, an outlet of the shaft seal steam main pipe is connected with a heater 16, a drain outlet of the steam main pipe is communicated with a drain pipeline, a shaft seal steam main pipe drainage pneumatic valve 15 is arranged on the drainage pipeline, and the outlet of the water pipeline is communicated with a drainage header 21;
an outlet of an adjacent machine auxiliary steam header 17 and an outlet of a cold re-steam pipeline 18 are communicated with an inlet of an auxiliary steam header 5, an outlet of the auxiliary steam header 5 is communicated with an inlet of a front electric valve 7 of the shaft seal electric heater and an inlet of a bypass electric valve 8 of the shaft seal electric heater, an outlet of the front electric valve 7 of the shaft seal electric heater passes through the shaft seal electric heater 6 and then is communicated with an outlet of the bypass electric valve 8 of the shaft seal electric heater through a pipeline and then is divided into two paths, wherein one path is communicated with a shaft seal steam main pipe through an auxiliary steam supply bypass electric valve 11, and the other path is communicated with the shaft seal steam main pipe through an auxiliary steam supply shaft seal electric valve 9 and an auxiliary steam supply shaft seal regulating valve 10;
the main pipe of bearing seal steam is communicated with one end of a bearing seal overflow regulating valve 12, the other end of the bearing seal overflow regulating valve 12 is connected with one end of a bearing seal overflow to a condenser electric valve 13 and one end of a bearing seal overflow to a low-pressure heater electric valve 14, the other end of the bearing seal overflow to the condenser electric valve 13 is connected with a condenser 19, and the other end of the bearing seal overflow to the low-pressure heater electric valve 14 is connected with a low-pressure heater 20.
Wherein, a first temperature measuring point T is arranged at the outlet of the shaft seal electric heater 61A second temperature measuring point T is arranged at the inlet of the auxiliary steam supply shaft seal electric valve 92。
Controller and first temperature measuring point T1A second temperature measuring point T2The shaft seal electric heater 6, 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 state of the shaft seal electric heater 6 comprises a closing state, an opening 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 automatically closing the auxiliary steam supply shaft seal electric valve 9 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, so as to prevent overcooled or overheated steam from entering a main shaft seal steam pipe;
3) before and after the unit is started and in the load increasing process, the shaft seal electric heater 6 is in a switching-on state, two curves of which the shaft seal steam supply temperature changes along with the rotor temperature are arranged in the controller, one curve represents the operation upper limit temperature, the other curve represents the operation lower limit temperature, the starting temperature value of the shaft seal electric heater 6 is set to be equal to the operation lower limit temperature value plus a temperature offset value, the temperature offset value is 5-15 ℃, when the temperature at the second temperature measuring point is lower 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 higher than the operation lower limit temperature;
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 meanwhile, the temperature protection value of the outlet of the shaft seal electric heater 6 is set to be 350 ℃, so that the equipment is protected from being damaged. Setting the temperature value of the outlet of the shaft seal electric heater 6 as an operation lower limit temperature value and a temperature offset value, modifying and flexibly adjusting the temperature offset value at any time according to the operation condition of a unit, ensuring that the temperature value of the outlet of the shaft seal electric heater 6 is greater than the start temperature value of the shaft seal electric heater 6, setting the stop temperature value of the shaft seal electric heater 6 as the outlet temperature value of the shaft seal electric heater 6 and the temperature offset value as the temperature at the second temperature measuring point is slightly lower than the temperature at the first temperature measuring point, ensuring that the shaft seal electric heater 6 heats steam to a sufficient temperature, automatically stopping the shaft seal electric heater 6 when the temperature at the first temperature measuring point is greater than the stop temperature value of the shaft seal electric heater 6, ensuring that the residual heating power of the shaft seal electric heater 6 cannot heat the temperature to the temperature protection value of the outlet of the shaft seal electric heater 6, avoiding a failed trip of the shaft seal electric heater 6.
The invention is applicable to ultra supercritical units, but is not limited to these, and all the above description illustrates the basic principles, main features and advantages of the invention. The present invention is not limited by the above-described embodiments, which are merely illustrative of the principles of the present invention. The present invention may be subject to various changes and modifications depending on the actual design and construction, which are within the scope of the present invention as claimed.
Claims (8)
1. A control system of an electric heater of a shaft seal system of an ultra-supercritical unit is characterized by comprising a controller, an auxiliary steam header (5), a front electric valve (7) of the shaft seal electric heater, a bypass electric valve (8) of the shaft seal electric heater, a shaft seal electric heater (6), an auxiliary steam supply shaft seal bypass electric valve (11), a main steam pipe of the shaft seal, an auxiliary steam supply shaft seal regulating valve (10) and an auxiliary steam supply shaft seal electric valve (9);
an outlet of the auxiliary steam header (5) is communicated with an inlet of a front electric valve (7) of the shaft seal electric heater and an inlet of a bypass electric valve (8) of the shaft seal electric heater, an outlet of the front electric valve (7) of the shaft seal electric heater passes through the shaft seal electric heater (6) and then is connected with an outlet of the bypass electric valve (8) of the shaft seal electric heater through a pipeline and then divided into two ways, wherein one way is communicated with a main steam pipe of the shaft seal through an auxiliary steam supply shaft seal bypass electric valve (11), and the other way is communicated with the main steam pipe of the shaft seal through an auxiliary steam supply shaft seal electric valve (9) and an auxiliary steam supply shaft seal regulating valve (10);
a first temperature measuring point T is arranged at the outlet of the shaft seal electric heater (6)1A second temperature measuring point T is arranged at the inlet of the auxiliary steam supply shaft seal electric valve (9)2；
Controller and first temperature measuring point T1A second temperature measuring point T2The shaft seal electric heater (6), the auxiliary steam supply shaft seal electric valve (9), the auxiliary steam supply shaft seal adjusting valve (10), the shaft seal electric heater bypass electric valve (8) and the auxiliary steam supply shaft seal bypass electric valve (11) are connected.
2. The ultra-supercritical unit shaft seal system electric heater control system according to claim 1, characterized in that the ultra-supercritical unit shaft seal system comprises a shaft seal steam return main pipe, an auxiliary steam header (5), a high pressure cylinder (1), an intermediate 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 intermediate 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 main pipe, and a shaft seal steam outlet of the high pressure cylinder (1), a steam outlet of the intermediate 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 return main pipe.
3. The control system of the shaft seal electric heater of the shaft seal system of the ultra supercritical unit according to claim 2, characterized in that manual valves are arranged between the shaft seal steam return main pipe and the shaft seal steam outlet of the high pressure cylinder (1), the shaft seal steam outlet of the intermediate pressure cylinder (2), 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).
4. The ultra supercritical unit shaft seal system shaft seal electric heater control system according to claim 2 further comprising a shaft seal heater (16); the outlet of the shaft seal steam return main pipe is connected with a shaft seal heater (16).
5. The ultra supercritical unit shaft seal system electric heater control system according to claim 2 further comprising a drain line and a drain header (21); the drain outlet of the shaft seal steam main pipe is communicated with a drain pipeline, a shaft seal steam main pipe drain pneumatic valve (15) is arranged on the drain pipeline, and the outlet of the water pipeline is communicated with a drain collecting pipe (21).
6. 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 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 main pipe of bearing seal steam is communicated with one end of a bearing seal overflow regulating valve (12), the other end of the bearing seal overflow regulating valve (12) is connected with one end of a bearing seal overflow to a condenser electric valve (13) and one end of a bearing seal overflow to a low-pressure heater electric valve (14), the other end of the bearing seal overflow to the condenser electric valve (13) is connected with a condenser (19), and the other end of the bearing seal overflow to the low-pressure heater electric valve (14) is connected with a low-pressure heater (20).
7. 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 machine auxiliary steam header (17) and a cold re-steam pipeline (18), wherein an outlet of the adjacent machine auxiliary steam header (17) and an outlet of the cold re-steam pipeline (18) are communicated with an inlet of the auxiliary steam header (5).
8. A control method of an electric heater for a shaft seal of a shaft seal system of an ultra-supercritical unit is characterized in that the control method is based on the electric heater control system for the shaft seal of the shaft seal system of the ultra-supercritical unit according to claim 1, and 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 (9), and automatically closing the auxiliary steam supply shaft seal electric valve (9) 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) so as to prevent overcooled or overheated steam from entering a shaft seal steam main pipe;
before and after the unit is started and in the load increasing process, the shaft seal electric heater (6) is in a closing state, two curves of which the shaft seal steam supply temperature changes along with the rotor temperature are arranged in the controller, one curve represents the upper operation limit temperature, the other curve represents the lower operation limit temperature, the starting temperature value of the shaft seal electric heater (6) is set to be the lower operation limit temperature value plus the temperature offset value, when the temperature at the second temperature measuring point is lower 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 operation limit temperature;
the maximum heating power of the shaft seal electric heater (6) is reduced, the temperature value of the outlet of the shaft seal electric heater (6) is set to be the operation lower limit temperature value and the temperature offset value, the stop temperature value of the shaft seal electric heater (6) is set to be the outlet temperature value and the temperature offset value of the shaft seal electric heater (6), when the temperature of the first temperature measuring point is greater than the stop temperature value of the shaft seal electric heater (6), the shaft seal electric heater (6) automatically stops working, the fact that the residual heating power of the shaft seal electric heater (6) cannot heat the temperature to the temperature protection value of the outlet of the shaft seal electric heater (6) is guaranteed, and the electric heater (6) is prevented from tripping due to faults.
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| Application Number | Priority Date | Filing Date | Title |
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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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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