CN110159360B - Shaft seal steam supply system and method for gas-steam combined cycle power plant - Google Patents
Shaft seal steam supply system and method for gas-steam combined cycle power plant Download PDFInfo
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- CN110159360B CN110159360B CN201910502624.6A CN201910502624A CN110159360B CN 110159360 B CN110159360 B CN 110159360B CN 201910502624 A CN201910502624 A CN 201910502624A CN 110159360 B CN110159360 B CN 110159360B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000000605 extraction Methods 0.000 claims abstract description 68
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 19
- 239000002918 waste heat Substances 0.000 claims abstract description 5
- 230000001105 regulatory effect Effects 0.000 claims description 75
- 238000007789 sealing Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 6
- 230000009467 reduction Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000010248 power generation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
- F01D11/06—Control thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A shaft seal steam supply system and a steam supply method of a gas-steam combined cycle power plant comprise a high-pressure main steam pipeline and a low-pressure main steam pipeline which are communicated with main steam at an outlet of a waste heat boiler, wherein steam extraction pipelines are respectively led out of the high-pressure main steam pipeline and the low-pressure main steam pipeline, and the high-pressure steam extraction pipelines and the low-pressure steam extraction pipelines are converged into an auxiliary steam header together; the high-pressure steam extraction pipeline and the low-pressure steam extraction pipeline are respectively provided with an adjusting valve group, the high-pressure steam extraction pipeline is provided with a branch pipeline in front of the adjusting valve group, the branch pipeline is also provided with an adjusting valve group and is directly connected with a shaft seal air supply pipeline, and the shaft seal air supply pipeline is provided with a temperature and pressure reducer; the auxiliary steam header is led out of the auxiliary steam header steam supply pipeline and is connected with the shaft seal air supply pipeline, and the auxiliary steam header steam supply pipeline is provided with an adjusting valve. The invention adopts high and low pressure main steam to supply steam to the shaft seal, thereby not only ensuring the quick start-stop performance of the unit, but also realizing the cascade utilization of energy and improving the energy utilization efficiency.
Description
Technical Field
The invention belongs to the field of thermal power generation, and relates to a shaft seal steam supply system and a shaft seal steam supply method of a gas-steam combined cycle power plant.
Background
Through research and continuous improvement in the last forty years, the combined cycle power generation of fuel gas and steam not only exceeds the steam power generation in efficiency, but also shows obvious advantages in various aspects. The novel generation power generation device has the advantages of high power generation efficiency, strong peak shaving capability, low unit power investment, short construction period, small occupied area and low pollution degree, which are recognized worldwide.
Based on the above characteristics, the gas-steam combined cycle unit has become the first choice for peak shaving and regional energy supply.
The shaft seal system bears the important life of the steam turbine seal, on one hand, the high-pressure end steam is prevented from leaking outwards, so that the economy of the unit is improved, and the environmental quality of a factory building is improved; on the other hand, the air at the low-pressure end is prevented from leaking into the unit, and the vacuum degree of the condenser is destroyed. The shaft seal can be divided into a foreign steam source steam supply shaft seal and a self-sealing shaft seal according to a steam supply source. At present, in a unit adopted by combined cycle, two shaft seal forms are used. Even for the self-sealing type shaft seal, a shaft seal steam supply system is required to be put into the start-stop process of the unit, and the shaft seal steam supply is required to be provided all the time instead of the self-sealing shaft seal.
For a gas-steam combined cycle unit, the main functions of the unit are peak shaving and regional functions, so that the unit is necessarily required to have quick and frequent starting and stopping capability. Therefore, for a gas-steam combined cycle unit, the importance of the shaft seal system is self-evident, and it is very necessary to design a safe, reliable and economical shaft seal system for the combined cycle unit.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a shaft seal steam supply system and a shaft seal steam supply method for a gas-steam combined cycle power plant, which not only ensure the quick start-stop performance of a unit, but also have very good economical efficiency and stability.
In order to achieve the purpose, the shaft seal steam supply system of the gas-steam combined cycle power plant adopts the following technical scheme:
the high-pressure main steam pipeline and the low-pressure main steam pipeline are communicated with main steam at an outlet of the waste heat boiler, and respectively lead out a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline, and the high-pressure steam extraction pipeline and the low-pressure steam extraction pipeline are converged into an auxiliary steam header together; the high-pressure steam extraction pipeline and the low-pressure steam extraction pipeline are respectively provided with an adjusting valve group, the high-pressure steam extraction pipeline is provided with a branch pipeline in front of the adjusting valve group, the branch pipeline is provided with an adjusting valve group and is directly connected with a shaft seal air supply pipeline, and the shaft seal air supply pipeline is provided with a temperature and pressure reducer capable of adjusting steam supply parameters; the auxiliary steam header is led out of the auxiliary steam header steam supply pipeline and is connected with the shaft seal air supply pipeline, and the auxiliary steam header steam supply pipeline is provided with an adjusting valve.
The regulating valve group comprises a regulating valve and a check valve which are sequentially arranged along the steam flow direction; the high-pressure steam extraction pipeline is connected with a branch pipeline of the steam extraction main pipe, a first regulating valve and a first check valve are arranged on the branch pipeline, and a second regulating valve and a second check valve are arranged on the branch pipeline, which is directly connected with the shaft seal air supply pipeline; the low-pressure steam extraction pipeline is provided with a third regulating valve and a third check valve.
The regulating valve on the auxiliary steam header steam supply pipeline is a fourth regulating valve.
The auxiliary steam header steam supply pipeline is connected to a pipeline between the temperature and pressure reducer and the second check valve.
And condensed water is introduced into the temperature and pressure reducing device.
The shaft seal air supply pipeline is divided into two branches which are respectively connected to two ends of the steam turbine generator unit.
The steam turbine generator unit adopts a self-sealing shaft seal or a non-self-sealing shaft seal.
The invention relates to a steam supply method of a shaft seal steam supply system of a gas-steam combined cycle power plant, which comprises the following steps:
the high-pressure steam extraction pipeline is directly connected with a branch pipeline of the shaft seal air supply pipeline, and the branch pipeline connected with the auxiliary steam header is a second high-pressure steam extraction branch pipeline; when the unit is started quickly, firstly, steam is directly supplied to a shaft seal of the steam turbine generator unit through the high-pressure steam extraction pipeline and the first high-pressure steam extraction branch pipeline, and steam supply parameters are regulated through the temperature and pressure reducer; the second high-pressure steam extraction branch pipeline is provided with a first regulating valve and a first check valve, the first high-pressure steam extraction branch pipeline is provided with a second regulating valve and a second check valve, and the low-pressure steam extraction pipeline is provided with a third regulating valve and a third check valve; gradually opening a third regulating valve and the first regulating valve along with the gradual increase of the load of the unit so that high-pressure main steam and low-pressure main steam are simultaneously converged into an auxiliary steam header; the temperature of the steam which is converged into the auxiliary steam header is controlled by adjusting the opening of the third regulating valve and the opening of the first regulating valve, and when the temperature is lower than the steam supply requirement of the shaft seal, the opening of the first regulating valve is increased, and the opening of the third regulating valve is reduced; when the temperature is higher than the shaft seal air supply pipeline, the opening of the third regulating valve is increased, the opening of the first regulating valve is reduced, the fourth regulating valve on the auxiliary steam header steam supply pipeline is opened, the second regulating valve is gradually and synchronously closed, and mixed steam in the auxiliary steam header gradually supplies steam to the shaft seal air supply pipeline.
For the non-self-sealing shaft seal, the normal operation is divided into two conditions; first case: when the low-pressure main steam parameter of the unit meets the requirement of the steam supply parameter of the shaft seal, reducing the high-pressure main steam quantity under the starting working condition until the high-pressure main steam quantity is zero, and completely supplying steam to the steam supply pipeline of the shaft seal by the low-pressure main steam, wherein the steam supply parameter is regulated by a temperature and pressure reducer; second case: when the low-pressure main steam parameters of the unit cannot meet the requirements, under the normal operation working condition, the high-pressure main steam from the high-pressure steam extraction pipeline and the low-pressure main steam from the low-pressure main steam extraction pipeline are adopted to supply steam to the shaft seal air supply pipeline through the auxiliary steam header, the second regulating valve is completely closed, and the steam supply parameters are regulated by the mixing proportion of the high-pressure main steam and the low-pressure main steam and the temperature and pressure reducer together. For the non-self-sealing shaft seal, in the shutdown process, along with the gradual reduction of the unit load, the parameters of high-pressure main steam and low-pressure main steam are also gradually reduced until the parameters of low-pressure main steam cannot meet the steam supply parameters, at the moment, the third regulating valve is gradually closed, the steam supply quantity of low-pressure main steam is reduced until the parameters of high-pressure main steam are lower than the steam supply parameters of the shaft seal, and at the moment, steam is continuously supplied through the steam stored in the auxiliary steam header until the shutdown is completed.
Compared with the prior art, the steam turbine generator unit has the advantages that the high-pressure main steam only supplies steam to the shaft seal system when the high-pressure steam reaches the shaft seal steam supply requirement in the early stage of the starting stage of the steam turbine generator unit through the opening and closing combination of the valves and the opening adjustment of different valves, the high-pressure main steam is gradually reduced along with the further rising of parameters, the low-pressure main steam is gradually put into the steam turbine generator unit until the low-pressure main steam is completely supplied, and the process is opposite when the steam turbine generator unit is stopped. Through setting up supplementary vapour header, both guaranteed high low pressure steam and fully mix, can guarantee again that even after the main vapour extraction pipeline valve is all closed, still can provide the vapour for the bearing seal in certain time. The invention adopts high and low pressure main steam to supply steam to the shaft seal, thereby not only ensuring the quick start-stop performance of the unit, but also realizing the cascade utilization of energy sources and improving the utilization efficiency of the energy sources; the invention does not need to start the boiler and construct a steam pipeline from the start boiler to the auxiliary steam header, reduces the initial investment of the system, and saves the operation and maintenance cost and the fuel cost of the start boiler; the starting step is simplified during operation, and the starting difficulty and the workload are reduced; the shaft seal steam supply system has excellent regulation performance, and simultaneously has the adjustment sensitivity and steam supply stability. According to the high-pressure steam extraction pipeline, the branch pipeline is arranged in front of the adjusting valve group, is provided with the adjusting valve and is directly connected with the shaft seal air supply pipeline, and on one hand, when the unit is started, high-pressure main steam can be directly supplied to the shaft seal, the buffer effect of the auxiliary steam header and the like is reduced, and the starting time is effectively shortened; on the other hand, in normal operation, when the steam supply from the auxiliary steam header is detected to be lower than the steam supply requirement of the shaft seal, the high-pressure main steam and the steam supply at the outlet of the auxiliary steam header can be quickly and directly mixed through the regulating valve group, the steam supply parameters can be quickly improved, and the real-time dynamic regulation of the steam supply parameters is realized.
Drawings
FIG. 1 is a schematic view of the overall structure of a shaft seal steam supply system of the present invention;
1-a waste heat boiler; 2-a high pressure main steam line; 3-a high-pressure steam extraction pipeline; 4-a first high pressure extraction branch conduit; 5-a second high pressure extraction branch conduit; 6-a first regulating valve; 7-a first check valve; 8-a second regulating valve; 9-a second check valve; 10-a temperature and pressure reducer; 11-a shaft seal air supply pipeline; 12-a low pressure main steam line; 13-a low-pressure steam extraction pipeline; 14-a third regulating valve; 15-a third check valve; 16-an auxiliary steam header; 17-an auxiliary steam header steam supply pipeline; 18-a fourth regulating valve; 19-turbo generator set.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the shaft seal steam supply system of the gas-steam combined cycle power plant comprises a high-pressure main steam pipeline 2 and a low-pressure main steam pipeline 12 which are communicated with main steam at an outlet of a waste heat boiler 1, wherein a high-pressure steam extraction pipeline 3 and a low-pressure steam extraction pipeline 13 are respectively led out of the high-pressure main steam pipeline 2 and the low-pressure main steam pipeline 12, and the high-pressure steam extraction pipeline 3 and the low-pressure steam extraction pipeline 13 are converged into an auxiliary steam header 16 together; the high-pressure steam extraction pipeline 3 and the low-pressure steam extraction pipeline 13 are respectively provided with an adjusting valve group, the high-pressure steam extraction pipeline 3 is provided with a branch pipeline in front of the adjusting valve group, the branch pipeline is also provided with an adjusting valve group and is directly connected with the shaft seal air supply pipeline 11, the branch pipeline of the high-pressure steam extraction pipeline 3 which is directly connected with the shaft seal air supply pipeline 11 is a first high-pressure steam extraction branch pipeline 4, and the branch pipeline connected with the auxiliary steam header 16 is a second high-pressure steam extraction branch pipeline 5.
The regulating valve group comprises regulating valves and check valves which are sequentially arranged along the steam flow direction, a first regulating valve 6 and a first check valve 7 are arranged on the second high-pressure steam extraction branch pipeline 5, a second regulating valve 8 and a second check valve 9 are arranged on the first high-pressure steam extraction branch pipeline 4, and a third regulating valve 14 and a third check valve 15 are arranged on the low-pressure steam extraction pipeline 13. The shaft seal air supply pipeline 11 is provided with a temperature and pressure reducer 10 capable of adjusting steam supply parameters, and condensation water is introduced into the temperature and pressure reducer 10. The auxiliary steam header 16 is led out of the auxiliary steam header steam supply pipeline 17 and is connected with the shaft seal air supply pipeline 11, and a fourth regulating valve 18 is arranged on the auxiliary steam header steam supply pipeline 17. An auxiliary header steam supply pipe 17 is connected to the pipe between the temperature and pressure reducer 10 and the second check valve 9.
The steam supply method of the shaft seal steam supply system of the gas-steam combined cycle power plant comprises the following steps: no matter self-sealing or non-self-sealing shaft seal, when the unit is started, because the low-pressure main steam parameter is lower, in order to realize quick start of the unit, firstly, the high-pressure steam extraction pipeline 3 and the first high-pressure steam extraction branch pipeline 4 are used for directly supplying steam to the shaft seal of the steam turbine generator unit 19, and the steam supply parameter can be regulated by the temperature and pressure reducer 10. As the unit load increases gradually, the parameters of the high-pressure main steam and the low-pressure main steam also increase gradually, and at this time, the third regulating valve 14 and the first regulating valve 6 are opened gradually, and the high-pressure main steam and the low-pressure main steam are simultaneously converged into the auxiliary steam header 16. The temperature of the steam which is converged into the auxiliary steam header 16 can be controlled by adjusting the opening of the third regulating valve 14 and the opening of the first regulating valve 6, and when the temperature is lower than the shaft seal steam supply requirement, the opening of the first regulating valve 6 is increased, and the opening of the third regulating valve 14 is reduced; and when the temperature is higher than that of the shaft seal steam supply pipeline, increasing the opening of the third regulating valve 14 and reducing the opening of the first regulating valve 6. Simultaneously, the fourth regulating valve 18 is opened, the second regulating valve 8 is gradually and synchronously closed, and the mixed steam in the auxiliary steam header gradually supplies steam to the shaft seal system. In the process, the gradual switching from the direct supply of the high-pressure main steam in the initial starting state to the supply of the low-pressure main steam and the high-pressure main steam to the supply of the low-pressure main steam to the shaft seal system is realized, and the supply of the high-pressure main steam is gradually reduced to increase the supply of the low-pressure main steam.
For non-self-sealing shaft seals, normal operation is classified into two conditions. First case: when the low-pressure main steam parameter of the unit meets the requirement of the shaft seal steam supply parameter, the high-pressure main steam quantity is further reduced until zero under the starting working condition. The low-pressure main steam is completely used for supplying steam to the shaft seal, and the steam supply parameters can be adjusted by the temperature and pressure reducer 10. Second case: when the low-pressure main steam parameters of the unit cannot meet the requirements, under the normal operation condition, the high-pressure main steam from the high-pressure steam extraction pipeline 3 and the low-pressure main steam from the low-pressure steam extraction pipeline 13 are adopted to supply steam to the shaft seal system through the auxiliary steam header 16, the second regulating valve 8 is completely closed, and the steam supply parameters are regulated by the mixing proportion of the high-pressure main steam and the low-pressure main steam and the temperature and pressure reducer 10.
For the non-self-sealing shaft seal, in the shutdown process, along with the gradual reduction of the unit load, the parameters of the high-pressure main steam and the low-pressure main steam are also gradually reduced until the parameters of the low-pressure main steam cannot meet the steam supply parameters, at the moment, the third regulating valve 14 is gradually closed, the steam supply quantity of the low-pressure main steam is reduced until the parameters of the high-pressure main steam are lower than the steam supply parameters of the shaft seal, at the moment, a certain amount of steam meeting the conditions is still stored in the auxiliary steam header 16, and the steam can be continuously supplied to the shaft seal system until the complete shutdown is achieved.
What needs to be specifically stated is: the shaft seal steam supply system of the invention is provided with a first high-pressure steam extraction branch pipe 4 for the purpose of:
on the one hand, when the unit is started, high-pressure main steam can be directly supplied to the shaft seal, so that the buffer effect of the auxiliary steam header 16 and the like is reduced, and the starting time is effectively shortened; on the other hand, in normal operation, when the steam supply from the auxiliary steam header 16 is detected to be lower than the steam supply requirement of the shaft seal, the steam supply parameters can be quickly improved by quickly mixing the high-pressure main steam with the steam supply at the outlet of the auxiliary steam header 16 through adjusting the second regulating valve 8, so that the real-time dynamic regulation of the steam supply parameters is realized.
The foregoing description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention in any way, and it will be understood by those skilled in the art that the present invention may be modified or substituted in several ways without departing from the spirit and principles of the invention, and that the modifications and substitutions fall within the scope of the invention as defined in the appended claims.
Claims (4)
1. A shaft seal steam supply system of a gas-steam combined cycle power plant is characterized in that: the high-pressure main steam pipe (2) and the low-pressure main steam pipe (12) are communicated with main steam at an outlet of the waste heat boiler (1), a high-pressure steam extraction pipe (3) and a low-pressure steam extraction pipe (13) are respectively led out from the high-pressure main steam pipe (2) and the low-pressure main steam pipe (12), and the high-pressure steam extraction pipe (3) and the low-pressure steam extraction pipe (13) are respectively connected to an auxiliary steam header (16); the high-pressure steam extraction pipeline (3) and the low-pressure steam extraction pipeline (13) are respectively provided with an adjusting valve group, the high-pressure steam extraction pipeline (3) is provided with a branch pipeline in front of the adjusting valve group, the branch pipeline is provided with an adjusting valve group and is directly connected with a shaft seal air supply pipeline (11), and the shaft seal air supply pipeline (11) is provided with a temperature and pressure reducer (10) capable of adjusting steam supply parameters; the auxiliary steam header (16) is led out of an auxiliary steam header steam supply pipeline (17) and is connected with the shaft seal air supply pipeline (11), and the auxiliary steam header steam supply pipeline (17) is provided with an adjusting valve;
the regulating valve on the auxiliary steam header steam supply pipeline (17) is a fourth regulating valve (18);
condensed water is introduced into the temperature and pressure reducer (10);
the regulating valve group comprises an electric valve and a check valve which are sequentially arranged along the steam flow direction;
the high-pressure steam extraction pipeline (3) is connected with a branch pipeline of the auxiliary steam header (16) and is provided with a first regulating valve (6) and a first check valve (7), and a branch pipeline which is directly connected with the shaft seal air supply pipeline (11) is provided with a second regulating valve (8) and a second check valve (9); a third regulating valve (14) and a third check valve (15) are arranged on the low-pressure steam extraction pipeline (13);
the high-pressure steam extraction pipeline (3) is directly connected with a shaft seal air supply pipeline (11), a branch pipeline connected with an auxiliary steam header (16) is a first high-pressure steam extraction branch pipeline (4), and a branch pipeline connected with the auxiliary steam header is a second high-pressure steam extraction branch pipeline (5);
when the unit is started quickly, firstly, steam is directly supplied to a shaft seal of a steam turbine generator unit (19) through a high-pressure steam extraction pipeline (3) and a first high-pressure steam extraction branch pipeline (4), and steam supply parameters are regulated through a temperature and pressure reducer (10);
a first regulating valve (6) and a first check valve (7) are arranged on the second high-pressure steam extraction branch pipeline (5), a second regulating valve (8) and a second check valve (9) are arranged on the first high-pressure steam extraction branch pipeline (4), and a third regulating valve (14) and a third check valve (15) are arranged on the low-pressure steam extraction pipeline (13); gradually opening a third regulating valve (14) and a first regulating valve (6) along with the gradual increase of the load of the unit so that high-pressure main steam and low-pressure main steam are simultaneously converged into an auxiliary steam header (16); the temperature of the steam which is converged into the auxiliary steam header (16) is controlled by adjusting the opening degrees of the third regulating valve (14) and the first regulating valve (6), and when the temperature is lower than the shaft seal steam supply requirement, the opening degree of the first regulating valve (6) is increased, and the opening degree of the third regulating valve (14) is reduced; when the temperature is higher than the requirement of a shaft seal air supply system, increasing the opening of the third regulating valve (14), reducing the opening of the first regulating valve (6), simultaneously opening the fourth regulating valve (18) on the auxiliary steam header steam supply pipeline (17), gradually and synchronously closing the second regulating valve (8), and gradually supplying steam to the shaft seal air supply pipeline (11) through mixed steam in the auxiliary steam header (16);
for the non-self-sealing shaft seal, the normal operation is divided into two conditions; first case: when the low-pressure main steam parameter of the unit meets the requirement of the shaft seal steam supply parameter, reducing the high-pressure main steam quantity under the starting working condition until the high-pressure main steam quantity is zero, and completely supplying steam to the shaft seal air supply pipeline (11) by the low-pressure main steam, wherein the steam supply parameter is regulated by the temperature and pressure reducer (10); second case: when the low-pressure main steam parameters of the unit cannot meet the requirements, under the normal operation working condition, the high-pressure main steam from the high-pressure steam extraction pipeline (3) and the low-pressure main steam from the low-pressure main steam extraction pipeline (13) are adopted to supply steam to the shaft seal air supply pipeline (11) through the auxiliary steam header (16), the second regulating valve (8) is completely closed, and the steam supply parameters are regulated by the mixing proportion of the high-pressure main steam and the low-pressure main steam and the temperature and pressure reducer (10);
for the non-self-sealing shaft seal, in the shutdown process, along with the gradual reduction of the unit load, the parameters of high-pressure main steam and low-pressure main steam are also gradually reduced until the parameters of low-pressure main steam cannot meet the steam supply parameters, at the moment, the third regulating valve (14) is gradually closed, the steam supply quantity of low-pressure main steam is reduced until the parameters of high-pressure main steam are lower than the steam supply parameters of the shaft seal, and at the moment, steam stored in the auxiliary steam header (16) is continuously supplied until the shutdown is completed.
2. The shaft seal steam supply system of a gas-steam combined cycle power plant according to claim 1, wherein: the auxiliary steam header steam supply pipeline (17) is connected to a pipeline between the temperature and pressure reducer (10) and the second check valve (9).
3. The shaft seal steam supply system of a gas-steam combined cycle power plant according to claim 1, wherein: the shaft seal air supply pipeline (11) is divided into two branches which are respectively connected with two ends of the steam turbine generator unit (19).
4. A shaft seal steam supply system for a gas-steam combined cycle power plant according to claim 3, wherein: the steam turbine generator unit (19) adopts a self-sealing shaft seal or a non-self-sealing shaft seal.
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| CN201910502624.6A CN110159360B (en) | 2019-06-11 | 2019-06-11 | Shaft seal steam supply system and method for gas-steam combined cycle power plant |
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| CN201910502624.6A CN110159360B (en) | 2019-06-11 | 2019-06-11 | Shaft seal steam supply system and method for gas-steam combined cycle power plant |
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| CN112431637A (en) * | 2020-11-20 | 2021-03-02 | 沧州华润热电有限公司 | Auxiliary steam header system and power supply system |
| CN113982700B (en) * | 2021-11-04 | 2023-11-21 | 华能山东石岛湾核电有限公司 | High-temperature gas cooled reactor shaft seal steam supply system |
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