CN114635758A - Ultra-supercritical unit shaft seal system and operation method - Google Patents
Ultra-supercritical unit shaft seal system and operation method Download PDFInfo
- Publication number
- CN114635758A CN114635758A CN202210190540.5A CN202210190540A CN114635758A CN 114635758 A CN114635758 A CN 114635758A CN 202210190540 A CN202210190540 A CN 202210190540A CN 114635758 A CN114635758 A CN 114635758A
- Authority
- CN
- China
- Prior art keywords
- shaft seal
- steam
- valve
- pressure cylinder
- auxiliary
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims description 40
- 230000002209 hydrophobic effect Effects 0.000 claims description 20
- 238000009530 blood pressure measurement Methods 0.000 claims description 13
- 238000003303 reheating Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
-
- 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
-
- 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
- F01D21/003—Arrangements for testing or measuring
-
- 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
-
- 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
- F01D25/12—Cooling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses an ultra supercritical unit shaft seal system and an operation method thereof. And the steam inlet sides of the ultrahigh pressure cylinder, the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are all supplied with steam by a shaft seal steam main pipe. Shaft seal leakage steam at two ends of the ultrahigh pressure cylinder is led out through a pipeline and is connected with a high pressure cylinder exhaust pipeline, and the shaft seal leakage steam at two ends of the high pressure cylinder is led out through a pipeline and is connected with a medium and low pressure communicating pipe. And a path of temperature reduction water is arranged on the side, close to the low-pressure cylinder, of the shaft seal steam main pipe, is taken from condensed water and is connected with the shaft seal steam main pipe. The invention not only recycles the shaft seal steam leakage at the two ends of the ultrahigh pressure cylinder and the high pressure cylinder respectively, but also leads the shaft seal overflow steam to the low pressure heater, thereby improving the thermal economy of the unit. And the temperature reduction water is introduced into the shaft seal steam position of the low-pressure cylinder, so that the problem of high temperature of the shaft seal at the side of the low-pressure cylinder is effectively solved, and the safety and the stability of the operation of a shaft seal system are improved.
Description
Technical Field
The invention relates to the technical field of steam turbine shaft seal system optimization, in particular to an ultra-supercritical unit shaft seal system and an operation method.
Background
In recent years, the ultra-supercritical technology is rapidly developed in China, the operated ultra-supercritical unit obtains good operation performance, and the unit has better reliability, economy and flexibility, so that the ultra-supercritical technology represents the advanced technical level and development trend of the current thermal power generation.
The shaft seal system is an important component of the steam turbine, wherein the high-pressure shaft seal is used for preventing high-temperature and high-pressure steam from leaking out of the cylinder, and the low-pressure shaft seal is used for preventing air from leaking into the cylinder, so that the high-efficiency operation of the unit is ensured. 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 overcooling or overheating steam is prevented from entering.
For the ultra-supercritical unit, because the unit has high operation parameters, a plurality of auxiliary systems and a complex structure, higher requirements are provided for the safety and the stability of the operation of the shaft seal system. Therefore, it is necessary to design and optimize the shaft seal system for the ultra-supercritical unit to ensure the safe, reliable and economical operation of the shaft seal system.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide the ultra-supercritical unit shaft seal system and the operation method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultra supercritical unit shaft seal system comprises an auxiliary steam header, and an ultrahigh pressure cylinder, a high pressure cylinder, a medium pressure cylinder, a low pressure cylinder A and a low pressure cylinder B which are connected in sequence;
the steam at the outlet of the auxiliary steam header is connected with a main shaft seal steam pipe, the steam inlet sides of the ultrahigh pressure cylinder, the high pressure cylinder, the intermediate pressure cylinder, the low pressure cylinder A and the low pressure cylinder B are all supplied with steam by the main shaft seal steam pipe, and the main shaft seal steam pipe is provided with a pressure measuring point P1And two temperature measuring points T1、T2After the steam is sealed in the shaft seal chamber, the residual steam enters the shaft seal steam return main pipe through steam return pipes, each steam return pipe is provided with a steam return manual regulating valve, and the steam of the shaft seal steam return main pipe goes to a shaft seal heater;
shaft seal leakage steam at two ends of the ultrahigh pressure cylinder is led out through a pipeline and is connected with an exhaust pipeline of the high pressure cylinder, and a check valve is arranged on the pipeline; shaft seal leakage steam at two ends of the high-pressure cylinder is led out through a pipeline and is connected with a medium-low pressure communicating pipe, a shaft seal steam main pipe to a medium-low pressure communicating pipe electric valve is arranged on the pipeline, a drain pipeline is arranged in front of the shaft seal steam main pipe to the medium-low pressure communicating pipe electric valve, shaft seal leakage steam to a medium-low pressure communicating pipe drain pneumatic valve is arranged on the drain pipeline, and drain is sent to a drain collecting pipe of a condenser body;
and a path of temperature reduction water is arranged on the side, close to the low-pressure cylinder, of the shaft seal steam main pipe, is taken from condensed water and is connected with the shaft seal steam main pipe through a temperature reduction water electric valve and a temperature reduction water regulating valve.
The invention is further improved in that the auxiliary steam header is provided with a temperature measuring point T6And pressure measurement point P3And the steam at the outlet of the auxiliary steam header is connected with the main shaft seal steam pipe sequentially through the shaft seal electric heater, the auxiliary steam supply shaft seal electric valve and the auxiliary steam supply shaft seal regulating valve.
The invention has the further improvement that the shaft seal electric heater is provided with a parallel bypass, a shaft seal electric heater bypass electric valve is arranged on the bypass, and a shaft seal electric heater front electric valve is arranged in front of the shaft seal electric heater; the auxiliary steam supply shaft seal pipeline is provided with a parallel bypass, and an auxiliary steam supply shaft is arranged on the parallel bypassClosing the bypass electric valve; the main pipeline and the bypass of the shaft seal electric heater, and the main pipeline and the bypass drain of the auxiliary steam supply shaft seal pipeline are all led to a drain header of the condenser body, and a pneumatic valve is arranged on the drain pipeline; a temperature measuring point T is arranged in front of the auxiliary steam supply shaft seal electric valve3And pressure measurement point P2。
The invention has the further improvement that the shaft seal steam main pipe is connected with the condenser through a shaft seal overflow regulating valve and a shaft seal overflow to condenser electric valve, and meanwhile, the shaft seal steam main pipe is connected with the low-pressure heater through a shaft seal overflow regulating valve and a shaft seal overflow to low-pressure heater electric valve.
The invention has the further improvement that the shaft seal steam main pipe is provided with a drain pipeline, a drain pneumatic valve of the shaft seal steam main pipe is arranged on the drain pipeline, and drain water is sent to a drain header of a condenser body.
The invention has the further improvement that the pipelines for the shaft seal to leak steam to the high-pressure cylinder exhaust pipeline and the middle and low-pressure communicating pipe are provided with temperature measuring points T4、T5。
The invention has the further improvement that the steam source of the auxiliary steam header is respectively provided by the adjacent auxiliary steam header and the secondary reheating cold section steam supply auxiliary steam header.
An operation method of an ultra-supercritical unit shaft seal system comprises the following steps:
a. in the starting stage of the unit, the auxiliary steam header supplies steam from the auxiliary steam header of the adjacent unit, a front electric valve of the shaft seal electric heater, an auxiliary steam supply shaft seal electric valve and an auxiliary steam supply shaft seal regulating valve are opened, and a shaft seal electric heater bypass electric valve and an auxiliary steam supply shaft seal bypass electric valve are closed; temperature measuring point T in front of monitoring auxiliary steam supply shaft seal electric valve3And pressure measurement point P2And a shaft seal steam main pipe temperature measuring point T1、T2And pressure measurement point P1Wherein, the shaft seal electric heater adjusts the temperature of the auxiliary steam, and the auxiliary steam supply shaft seal adjusting valve controls the pressure of the main steam pipe of the shaft seal; simultaneously, the shaft seal steam main pipe drainage pneumatic valve is started, the shaft seal electric heater main pipe drainage pneumatic valve and the shaft seal electric heater bypass drainage gas pneumatic valve on the shaft seal electric heater main pipe and the bypass, the auxiliary gas supply shaft seal pipeline main pipe and the bypass drainage pipeline are startedThe main path drainage pneumatic valve and the auxiliary shaft seal bypass drainage pneumatic valve are respectively connected with a main shaft and an auxiliary shaft seal; closing the shaft seal overflow regulating valve, the shaft seal overflow to the condenser electric valve and the shaft seal overflow to the low-pressure heater electric valve, closing the shaft seal steam main pipe to the middle and low-pressure communicating pipe electric valve, and closing the desuperheating water electric valve and the desuperheating water regulating valve;
b. when the unit is connected to the grid and the load is continuously increased, the secondary reheating cold section steam comes from the high-pressure cylinder to exhaust steam, so that the metal temperature of the cylinder body can be better matched, the steam source of the auxiliary steam header is switched, and the steam source is gradually switched to the secondary reheating cold section steam provided by the adjacent auxiliary steam header; meanwhile, the shaft seal system is gradually switched to a self-sealing state, the auxiliary steam supply shaft seal regulating valve is gradually closed, when the auxiliary steam supply shaft seal regulating valve is completely closed, the shaft seal overflow regulating valve and the shaft seal overflow to the condenser electric valve to be opened, the shaft seal system is in the self-sealing state, the shaft seal steam overflows and then goes to the condenser, and the shaft seal overflow regulating valve maintains the stability of the temperature and the pressure of a main pipe of the shaft seal steam; paying attention to the temperature T of the pipeline for removing the leaked steam from the shaft seal to the medium-low pressure communicating pipe5When the temperature meets the requirement, gradually opening the electric valve from the shaft seal steam main pipe to the middle-low pressure communicating pipe, simultaneously closing the drainage pneumatic valve of the shaft seal steam main pipe, and closing the pneumatic valves on the main pipe and the bypass of the shaft seal electric heater, the main pipe and the bypass of the auxiliary steam supply shaft seal pipeline;
c. when the load of the unit is stable or in a high-load running state, closely monitoring the temperature display temperature T of the temperature measuring point of the main steam pipe of the shaft seal at the side of the low-pressure cylinder2And when the temperature is higher than the set temperature, the electric valve for reducing the temperature is opened, the opening degree of the electric valve for regulating the temperature of the shaft seal at the side of the low-pressure cylinder is adjusted to control the steam temperature of the shaft seal at the low-pressure cylinder, and after the heat recovery system of the unit is put into use, the electric valve for opening the shaft seal to overflow to the low-pressure heater is opened, and meanwhile, the electric valve for closing the shaft seal to overflow to the condenser is closed.
The invention has at least the following beneficial technical effects:
the invention provides an optimization scheme of a shaft seal system of an ultra supercritical unit, which not only recycles shaft seal steam leakage at two ends of an ultra high pressure cylinder and a high pressure cylinder respectively, but also introduces desuperheating water at a shaft seal steam position of a low pressure cylinder, and effectively solves the problem of high temperature of the shaft seal steam at the side of the low pressure cylinder after the shaft seal system is self-sealed.
Meanwhile, shaft seal overflow steam is introduced into the low-pressure heater, the temperature of the outlet of the water supply side of the low-pressure heater is increased by using the heat of the overflow steam, and the heat economy of the unit is improved.
The operation method of the shaft seal system not only considers the operation steps and the control strategy of the system when the unit is normally started, but also provides the control strategy of the shaft seal system when the unit is in various operation states. The system control mode is flexible and simple, easy to operate and high in automation degree.
Drawings
FIG. 1 is a schematic view of the present invention.
Wherein, 1 is a turbine ultra-high pressure cylinder, 2 is a turbine high pressure cylinder, 3 is a turbine intermediate pressure cylinder, 4 is a low pressure cylinder A, 5 is a low pressure cylinder B, 6 is an auxiliary steam header, 7 is a shaft seal electric heater, 8 is a shaft seal electric heater front electric valve, 9 is a shaft seal electric heater bypass electric valve, 10 is a shaft seal electric heater main circuit hydrophobic pneumatic valve, 11 is a shaft seal electric heater bypass hydrophobic pneumatic valve, 12 is an auxiliary steam supply shaft seal electric valve, 13 is an auxiliary steam supply shaft seal regulating valve, 14 is an auxiliary steam supply shaft seal bypass electric valve, 15 is an auxiliary steam supply shaft seal main circuit hydrophobic pneumatic valve, 16 is an auxiliary steam supply bypass shaft seal hydrophobic pneumatic valve, 17 is a check valve, 18 is a shaft seal steam main pipe to middle and low pressure communicating pipe, 19 is a steam leakage to middle and low pressure hydrophobic pneumatic valve, 20 is a desuperheating water electric valve, 21 is a desuperheating water regulating valve, 22 is a shaft seal steam pipe hydrophobic pneumatic valve, 23 is a shaft seal overflow regulating valve, 24 is a shaft seal overflow to condenser electric valve, 25 is a shaft seal overflow to low-pressure heater electric valve, 26 is an adjacent machine auxiliary steam header, 27 is secondary reheating cold section steam, 28 is a high-pressure cylinder exhaust pipeline, 29 is a medium-low pressure communicating pipe, 30 is a drainage header, 31 is temperature-reducing water, 32 is a shaft seal heater, 33 is a condenser, and 34 is a low-pressure heater.
Temperature measuring point T1、T2、T3、T4、T5And T6Pressure measurement point P1、P2And P3。
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the shaft seal system of the ultra supercritical unit includes an auxiliary steam header 6, and an ultra high pressure cylinder 1, a high pressure cylinder 2, an intermediate pressure cylinder 3, a low pressure cylinder a4 and a low pressure cylinder B5 which are connected in sequence. The steam inlet sides of the ultrahigh pressure cylinder 1, the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinders 4 and 5 are all supplied with steam by a shaft seal steam main pipe, and the shaft seal steam main pipe is provided with a pressure measuring point P1And two temperature measuring points T1、T2After the steam is sealed in the shaft seal chamber, the rest steam enters the shaft seal steam return main pipe through the steam return pipe, each steam return pipe is provided with a steam return manual regulating valve, and the steam of the shaft seal steam return main pipe goes to the shaft seal heater 32. The shaft seal steam main pipe is provided with a drain pipeline, a shaft seal steam main pipe drainage pneumatic valve is arranged on the drain pipeline, and drainage is carried out to a drainage collecting pipe 30 of the condenser body.
Shaft seal leakage steam at two ends of the ultrahigh pressure cylinder 1 is led out through a pipeline and is connected with an exhaust pipeline of the high pressure cylinder, and a check valve 17 is arranged on the pipeline; shaft seal steam leakage at two ends of the high-pressure cylinder 2 is led out through a pipeline and is connected with a middle and low pressure communicating pipe, a shaft seal steam main pipe to the middle and low pressure communicating pipe electric valve 18 is arranged on the pipeline, a drain pipeline is arranged in front of the shaft seal steam main pipe to the middle and low pressure communicating pipe electric valve 18, a pneumatic valve 19 is arranged on the drain pipeline, and drain goes to a drain collecting pipe 30 of a condenser body. The pipelines of the shaft seal steam leakage high-pressure cylinder exhaust pipeline and the middle and low pressure communicating pipe are provided with temperature measuring points T4、T5。
The steam source of the auxiliary steam header 6 is provided by the auxiliary steam header 26 of the adjacent machine and the secondary reheating cold section steam 27 for the auxiliary steam header respectively. The auxiliary steam header 6 is provided with a temperature measuring point T6And pressure measurement point P3And the steam at the outlet of the auxiliary steam header 6 is connected with the main shaft seal steam pipe sequentially through the shaft seal electric heater 7, the auxiliary steam supply shaft seal electric valve 12 and the auxiliary steam supply shaft seal regulating valve 13. The shaft seal electric heater 7 is provided with a parallel bypass, a shaft seal electric heater bypass electric valve 9 is arranged on the bypass, and a shaft seal electric heater front electric valve 8 is arranged in front of the shaft seal electric heater 7. The auxiliary steam supply shaft seal pipeline is provided with a parallel bypass, and an electric valve 14 of the auxiliary steam supply shaft seal bypass is arranged on the bypass. The main path and the bypass of the shaft seal electric heater and the main path and the bypass of the auxiliary steam supply shaft seal pipeline are drained and go to the condensateThe steam trap body is provided with a drain collecting pipe, and a pneumatic valve is arranged on the drain pipeline. A temperature measuring point T is arranged in front of the auxiliary steam supply shaft seal electric valve 123And pressure measurement point P2。
The shaft seal steam main pipe is connected with the condenser 33 through the shaft seal overflow adjusting valve 23 and the shaft seal overflow to low-pressure heater electric valve 24, and meanwhile, the shaft seal steam main pipe is connected with the low-pressure heater 34 through the shaft seal overflow adjusting valve 23 and the shaft seal overflow to low-pressure heater electric valve 25.
A path of temperature reduction water is arranged on the side, close to the low-pressure cylinder, of the shaft seal steam main pipe, and the temperature reduction water is taken from condensed water and is connected with the shaft seal steam main pipe through a temperature reduction water electric valve 20 and a temperature reduction water regulating valve 21.
The invention provides an operation method of an ultra-supercritical unit shaft seal system, which comprises the following steps:
a. in the starting stage of the unit, the auxiliary steam header 6 supplies steam from the auxiliary steam header of the adjacent unit, the front electric valve 8 of the shaft seal electric heater, the auxiliary steam supply shaft seal electric valve 12 and the auxiliary steam supply shaft seal regulating valve 13 are opened, and the shaft seal electric heater bypass electric valve 9 and the auxiliary steam supply shaft seal bypass electric valve 14 are closed. Closely monitor temperature measurement point T before auxiliary steam supply shaft seal motorised valve3And pressure measurement point P2And a shaft seal steam main pipe temperature measuring point T1、T2And pressure measurement point P1Wherein, the shaft seal electric heater 7 adjusts the temperature of the auxiliary steam, and the auxiliary steam supply shaft seal adjusting valve 13 controls the pressure of the main steam pipe of the shaft seal. Simultaneously, the shaft seal steam main pipe hydrophobic pneumatic valve 22 is started, and the shaft seal electric heater main pipe hydrophobic pneumatic valve 10, the shaft seal electric heater bypass hydrophobic pneumatic valve 11, the auxiliary steam supply shaft seal main pipe hydrophobic pneumatic valve 15 and the auxiliary steam supply shaft seal bypass hydrophobic pneumatic valve 16 on the shaft seal electric heater main pipe and the bypass, and the auxiliary steam supply shaft seal pipeline main pipe and the bypass hydrophobic pipeline are started; closing the shaft seal overflow regulating valve 23, the shaft seal overflow to the condenser electric valve 24 and the shaft seal overflow to the low-pressure heater electric valve 25, closing the shaft seal steam main pipe to the medium and low-pressure communicating pipe electric valve 18, and closing the desuperheating water electric valve 20 and the desuperheating water regulating valve 21;
b. when the unit is connected to the grid and the load is continuously increased, the steam of the secondary reheating cold section comes from the exhaust steam of the high-pressure cylinder 2, so that the metal of the cylinder body can be better matchedAnd the steam source of the auxiliary steam header is switched, and the steam is gradually switched to the secondary reheating cold section by the auxiliary steam header of the adjacent machine. Meanwhile, the shaft seal system gradually turns into a self-sealing state, the auxiliary steam supply shaft seal regulating valve 13 is gradually closed, after the auxiliary steam supply shaft seal regulating valve 13 is completely closed, the shaft seal overflow regulating valve 23 and the shaft seal overflow to the condenser electric valve 24 are opened, the shaft seal system is in the self-sealing state, steam of the shaft seal overflows and then goes to the condenser, and the shaft seal overflow regulating valve 23 maintains the stability of the temperature and the pressure of a main pipe of the shaft seal steam. Closely paying attention to the temperature T of the pipeline for removing shaft seal leakage steam to the medium and low pressure communicating pipe5And after the temperature meets the requirement, gradually opening the shaft seal steam main pipe to the electric valve 18 of the medium and low pressure communicating pipe. Simultaneously, closing the shaft seal steam main pipe drainage pneumatic valve 22, and closing pneumatic valves on a main pipe and a bypass of the shaft seal electric heater, and a main pipe and a bypass drainage pipeline of an auxiliary steam supply shaft seal pipeline;
c. when the load of the unit is stable or in a high-load running state, closely monitoring the temperature display temperature T of the temperature measuring point of the main steam pipe of the shaft seal at the side of the low-pressure cylinder2When the temperature is higher than the set temperature, the electric water valve 20 for reducing the temperature is opened, and the opening degree of the water regulating valve 21 for reducing the temperature is adjusted to control the steam temperature of the shaft seal at the low-pressure cylinder side. After the unit heat recovery system is put into operation, the shaft seal is opened and overflows to the low-pressure heater electric valve 25, and meanwhile, the shaft seal overflows to the condenser electric valve 24.
The invention provides some optimization and operation methods for the shaft seal system of the ultra-supercritical unit, which are suitable for the ultra-supercritical unit, but not limited to the units. All the above description sets forth the fundamental principles of the invention, its essential features and the 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. The ultra supercritical unit shaft seal system is characterized by comprising an auxiliary steam header, and an ultra high pressure cylinder, a high pressure cylinder, an intermediate pressure cylinder, a low pressure cylinder A and a low pressure cylinder B which are sequentially connected;
auxiliary steam header outletThe steam at the opening is connected with a main shaft seal steam pipe, the steam inlet sides of the ultrahigh pressure cylinder, the high pressure cylinder, the intermediate pressure cylinder, the low pressure cylinder A and the low pressure cylinder B are all supplied with steam by the main shaft seal steam pipe, and the main shaft seal steam pipe is provided with a pressure measuring point P1And two temperature measuring points T1、T2After the steam is sealed in the shaft seal chamber, the residual steam enters the shaft seal steam return main pipe through steam return pipelines, each steam return pipeline is provided with a steam return manual regulating valve, and the steam of the shaft seal steam return main pipe goes to a shaft seal heater;
shaft seal leakage steam at two ends of the ultrahigh pressure cylinder is led out through a pipeline and is connected with an exhaust pipeline of the high pressure cylinder, and a check valve is arranged on the pipeline; shaft seal steam leakage at two ends of the high-pressure cylinder is led out through a pipeline and is connected with a middle and low pressure communicating pipe, a shaft seal steam main pipe to middle and low pressure communicating pipe electric valve is arranged on the pipeline, a drain pipeline is arranged in front of the shaft seal steam main pipe to the middle and low pressure communicating pipe electric valve, shaft seal steam leakage is arranged on the drain pipeline to a middle and low pressure communicating pipe drain pneumatic valve, and drain water is sent to a drain header of a condenser body;
and a path of temperature reduction water is arranged on the side, close to the low-pressure cylinder, of the shaft seal steam main pipe, is taken from condensed water and is connected with the shaft seal steam main pipe through a temperature reduction water electric valve and a temperature reduction water regulating valve.
2. The ultra supercritical unit shaft seal system according to claim 1 wherein the auxiliary steam header is provided with a temperature measuring point T6And pressure measurement point P3And the steam at the outlet of the auxiliary steam header is connected with the main shaft seal steam pipe sequentially through the shaft seal electric heater, the auxiliary steam supply shaft seal electric valve and the auxiliary steam supply shaft seal regulating valve.
3. The ultra supercritical unit shaft seal system according to claim 2, wherein the shaft seal electric heater is provided with a parallel bypass, a shaft seal electric heater bypass electric valve is arranged on the bypass, and a shaft seal electric heater front electric valve is arranged in front of the shaft seal electric heater; the auxiliary steam supply shaft seal pipeline is provided with a parallel bypass, and an electric valve of the auxiliary steam supply shaft seal bypass is arranged on the parallel bypass; the main path and the bypass of the shaft seal electric heater and the main path and the bypass of the auxiliary steam supply shaft seal pipeline drain water all go to the drain water collecting pipe of the condenser bodyA pneumatic valve is arranged on the drain pipeline; a temperature measuring point T is arranged in front of the auxiliary steam supply shaft seal electric valve3And pressure measurement point P2。
4. The ultra supercritical unit shaft seal system according to claim 3 wherein the shaft seal steam main is connected to the condenser through a shaft seal overflow regulating valve and a shaft seal overflow to condenser electric valve, and the shaft seal steam main is connected to the low pressure heater through a shaft seal overflow regulating valve and a shaft seal overflow to low pressure heater electric valve.
5. The ultra supercritical unit shaft seal system according to claim 4 wherein the shaft seal steam main has a drain line, and a shaft seal steam main drain pneumatic valve is disposed on the drain line, and the drain goes to the drain header of the condenser body.
6. The ultra supercritical unit shaft seal system according to claim 5 wherein the pipelines for shaft seal steam leakage to high pressure cylinder exhaust pipeline and medium and low pressure communicating pipe are provided with temperature measuring point T4、T5。
7. The ultra supercritical unit shaft seal system according to claim 1 wherein the steam source of the auxiliary steam header is provided by the adjacent auxiliary steam header and the secondary reheat cold section steam supply auxiliary steam header, respectively.
8. The method of claim 6, further comprising the steps of:
a. in the starting stage of the unit, the auxiliary steam header supplies steam from the auxiliary steam header of the adjacent unit, a front electric valve of the shaft seal electric heater, an auxiliary steam supply shaft seal electric valve and an auxiliary steam supply shaft seal regulating valve are opened, and a shaft seal electric heater bypass electric valve and an auxiliary steam supply shaft seal bypass electric valve are closed; temperature measuring point T in front of monitoring auxiliary steam supply shaft seal electric valve3And pressure measurement point P2And a shaft seal steam main pipe temperature measuring point T1、T2And pressure measurement point P1Wherein, the shaft seal electric heater adjusts the temperature of the auxiliary steam, and the auxiliary steam supply shaft seal adjusting valve controls the pressure of the main steam pipe of the shaft seal; simultaneously starting a shaft seal steam main pipe hydrophobic pneumatic valve, and starting a shaft seal electric heater main pipe hydrophobic pneumatic valve, a shaft seal electric heater bypass hydrophobic pneumatic valve, an auxiliary steam supply shaft seal main pipe hydrophobic pneumatic valve and an auxiliary steam supply shaft seal bypass hydrophobic pneumatic valve on a shaft seal electric heater main pipe and a bypass, and an auxiliary steam supply shaft seal main pipe hydrophobic pneumatic valve and an auxiliary steam supply shaft seal bypass hydrophobic pneumatic valve on a bypass hydrophobic pipeline; closing the shaft seal overflow regulating valve, the shaft seal overflow to the condenser electric valve and the shaft seal overflow to the low-pressure heater electric valve, closing the shaft seal steam main pipe to the middle and low-pressure communicating pipe electric valve, and closing the desuperheating water electric valve and the desuperheating water regulating valve;
b. when the unit is connected to the grid and the load is continuously increased, the secondary reheating cold section steam comes from the high-pressure cylinder to exhaust steam, so that the metal temperature of the cylinder body can be better matched, the steam source of the auxiliary steam header is switched, and the steam source is gradually switched to the secondary reheating cold section steam provided by the adjacent auxiliary steam header; meanwhile, the shaft seal system is gradually switched to a self-sealing state, the auxiliary steam supply shaft seal regulating valve is gradually closed, when the auxiliary steam supply shaft seal regulating valve is completely closed, the shaft seal overflow regulating valve and the shaft seal overflow to the condenser electric valve to be opened, the shaft seal system is in the self-sealing state, the shaft seal steam overflows and then goes to the condenser, and the shaft seal overflow regulating valve maintains the stability of the temperature and the pressure of a main pipe of the shaft seal steam; paying attention to the temperature T of the pipeline for removing the leaked steam from the shaft seal to the middle-low pressure communicating pipe5When the temperature meets the requirement, gradually opening the electric valve from the shaft seal steam main pipe to the middle-low pressure communicating pipe, simultaneously closing the drainage pneumatic valve of the shaft seal steam main pipe, and closing the pneumatic valves on the main pipe and the bypass of the shaft seal electric heater, the main pipe and the bypass of the auxiliary steam supply shaft seal pipeline;
c. when the load of the unit is stable or in a high-load running state, closely monitoring the temperature display temperature T of the temperature measuring point of the main steam pipe of the shaft seal at the side of the low-pressure cylinder2And when the temperature is higher than the set temperature, the electric valve for reducing the temperature is opened, the opening degree of the electric valve for regulating the temperature of the shaft seal at the side of the low-pressure cylinder is adjusted to control the steam temperature of the shaft seal at the low-pressure cylinder, and after the heat recovery system of the unit is put into use, the electric valve for opening the shaft seal to overflow to the low-pressure heater is opened, and meanwhile, the electric valve for closing the shaft seal to overflow to the condenser is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190540.5A CN114635758B (en) | 2022-02-28 | 2022-02-28 | Ultra-supercritical unit shaft seal system and operation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210190540.5A CN114635758B (en) | 2022-02-28 | 2022-02-28 | Ultra-supercritical unit shaft seal system and operation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114635758A true CN114635758A (en) | 2022-06-17 |
| CN114635758B CN114635758B (en) | 2024-05-07 |
Family
ID=81948730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210190540.5A Active CN114635758B (en) | 2022-02-28 | 2022-02-28 | Ultra-supercritical unit shaft seal system and operation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114635758B (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06299803A (en) * | 1993-04-13 | 1994-10-25 | Toshiba Eng Co Ltd | Bypass method of gland sealing steam system of steam turbine |
| JP2010209858A (en) * | 2009-03-11 | 2010-09-24 | Toshiba Corp | Steam turbine device |
| 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 |
| CN108425706A (en) * | 2018-04-28 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of shaft seal steam supply system and its control method for double reheat power generation sets |
| CN110332017A (en) * | 2019-08-08 | 2019-10-15 | 国家电投集团河南电力有限公司技术信息中心 | A kind of adaptive shaft seal steam supply system |
| CN212614913U (en) * | 2020-06-24 | 2021-02-26 | 北方魏家峁煤电有限责任公司 | Safe and energy-saving system for shaft seal steam of supercritical unit |
| CN112610286A (en) * | 2020-12-30 | 2021-04-06 | 西安热工研究院有限公司 | Multi-steam-source shaft seal steam/gas supply system of power station unit and control method thereof |
| CN214035794U (en) * | 2020-12-28 | 2021-08-24 | 国核电力规划设计研究院有限公司 | Shaft seal steam supply system with energy storage function |
| 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 |
| CN215170217U (en) * | 2021-05-18 | 2021-12-14 | 京能(赤峰)能源发展有限公司 | Unit air seal air supply system for cold start of steam turbine |
| CN113833534A (en) * | 2021-10-18 | 2021-12-24 | 西安热工研究院有限公司 | Supercritical carbon dioxide turbine shaft seal air supply and leakage recovery system and method |
-
2022
- 2022-02-28 CN CN202210190540.5A patent/CN114635758B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06299803A (en) * | 1993-04-13 | 1994-10-25 | Toshiba Eng Co Ltd | Bypass method of gland sealing steam system of steam turbine |
| JP2010209858A (en) * | 2009-03-11 | 2010-09-24 | Toshiba Corp | Steam turbine device |
| 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 |
| CN108425706A (en) * | 2018-04-28 | 2018-08-21 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of shaft seal steam supply system and its control method for double reheat power generation sets |
| CN110332017A (en) * | 2019-08-08 | 2019-10-15 | 国家电投集团河南电力有限公司技术信息中心 | A kind of adaptive shaft seal steam supply system |
| CN212614913U (en) * | 2020-06-24 | 2021-02-26 | 北方魏家峁煤电有限责任公司 | Safe and energy-saving system for shaft seal steam of supercritical unit |
| CN214035794U (en) * | 2020-12-28 | 2021-08-24 | 国核电力规划设计研究院有限公司 | Shaft seal steam supply system with energy storage function |
| CN112610286A (en) * | 2020-12-30 | 2021-04-06 | 西安热工研究院有限公司 | Multi-steam-source shaft seal steam/gas supply system of power station unit and control method thereof |
| CN215170217U (en) * | 2021-05-18 | 2021-12-14 | 京能(赤峰)能源发展有限公司 | Unit air seal air supply system for cold start of steam turbine |
| 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 |
| CN113833534A (en) * | 2021-10-18 | 2021-12-24 | 西安热工研究院有限公司 | Supercritical carbon dioxide turbine shaft seal air supply and leakage recovery system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114635758B (en) | 2024-05-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109441575B (en) | Method for operating heat supply network system of steam combined cycle generator set in heat supply period | |
| CN109855147B (en) | Combined cycle device based on heat supply and power peak regulation coupling and operation method thereof | |
| CN113404551A (en) | Shaft seal steam supply system of gas-steam combined cycle heat supply unit and operation method | |
| CN108343479A (en) | A kind of solidifying pumping back of the body heating system and adjusting method based on two units | |
| CN108425706B (en) | Shaft seal steam supply system for secondary reheating unit and control method of shaft seal steam supply system | |
| CN111023859A (en) | Anti-freezing system and method for low-pressure cylinder zero-power operation air cooling island of direct air cooling unit | |
| CN110793011A (en) | Two-stage steam extraction type medium-temperature and medium-pressure waste incineration power generation system and use method thereof | |
| CN109869784B (en) | Combined cycle device for steam extraction integration and heat accumulation peak shaving coupling and operation method thereof | |
| CN212614913U (en) | Safe and energy-saving system for shaft seal steam of supercritical unit | |
| CN210178427U (en) | Long blade cooling system under cylinder cutting operation of steam turbine | |
| CN114635758A (en) | Ultra-supercritical unit shaft seal system and operation method | |
| CN116733556A (en) | Energy-saving and safe steam turbine shaft seal steam exhaust system and working method thereof | |
| CN207674551U (en) | A kind of cooling tower antifreezing system for the solidifying pumping back of the body heat supply of steam turbine | |
| CN105888845A (en) | Natural gas differential pressure cold energy utilization device | |
| CN216429784U (en) | Natural gas heating device | |
| CN206636604U (en) | A kind of quick cooling system of temperature of power plant steam turbine | |
| CN211851937U (en) | Wet cooling unit low-pressure cylinder zero-power heating system | |
| CN114877307A (en) | Double-pumping back pressure heat supply system capable of realizing high-parameter heat supply and working method thereof | |
| CN112282866A (en) | Steam turbine generator unit shaft seal steam supply pipeline heating system and control method thereof | |
| CN216110877U (en) | Gas-steam combined cycle heat supply unit shaft seal steam supply system | |
| CN208184797U (en) | A kind of solidifying pumping back heating system based on two unit black soy sauce vapour | |
| CN218624343U (en) | Shaft seal heat regenerative system of million ultra-supercritical unit | |
| CN114934817B (en) | Shaft seal steam supply system of middle-low pressure cylinder type steam turbine and operation method | |
| CN220791318U (en) | Energy-saving type induced draft fan steam turbine steam source fast switching system | |
| CN217109522U (en) | Configuration system of condensate pump recirculation valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |