CN215170217U - Unit air seal air supply system for cold start of steam turbine - Google Patents
Unit air seal air supply system for cold start of steam turbine Download PDFInfo
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- CN215170217U CN215170217U CN202121057476.0U CN202121057476U CN215170217U CN 215170217 U CN215170217 U CN 215170217U CN 202121057476 U CN202121057476 U CN 202121057476U CN 215170217 U CN215170217 U CN 215170217U
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Abstract
A unit gas seal gas supply system for cold start of a steam turbine comprises an adjacent machine auxiliary steam header, wherein a first port of the adjacent machine auxiliary steam header is connected with an adjacent machine gas supply pipeline, a second port of the adjacent machine auxiliary steam header is connected with a first port of an auxiliary steam standby header through a connecting pipeline, a second port of the auxiliary steam standby header is connected with a three-section steam extraction port of a medium pressure cylinder through a three-section steam extraction pipeline, a third port of the auxiliary steam standby header is connected with a first inlet of a gas supply shaft seal header through a shaft seal header gas supply pipeline, a first outlet of the gas supply shaft seal header is connected with an inlet of a second pressure equalizing box through a low pressure shaft seal gas supply pipeline, the second pressure equalizing box provides steam for a low pressure cylinder shaft seal, a second outlet of the gas supply shaft seal header is connected with a first pressure equalizing box through a medium pressure shaft seal gas supply pipeline, the first pressure equalizing box provides steam for the high pressure cylinder, The intermediate pressure shaft seal provides shaft seal steam. Shaft seal steam is provided by adjacent units or the boilers of the unit, so that the energy-saving and emission-reducing effects are better.
Description
Technical Field
The utility model relates to a steam turbine technical field, concretely relates to unit atmoseal air feed system for steam turbine cold starting.
Background
The cogeneration project was primarily applied in the industrial field at the earliest time, and then developed to the central heating of residents. My company is provided with two sets of turbosets. Generally, steam with qualified quality is required at a shaft seal position of a steam turbine unit in the operation process so as to ensure the sealing of the device and prevent the leakage of cold air and the leakage of steam in a cylinder. The steam turbine of power plant can satisfy the bearing seal and supply vapour needs through the three-section extraction steam of intermediate pressure jar in service, but in cold starting process, because self no steam is taken out or is taken out the steam unqualified in quality, can dispose a start-up boiler and satisfy the requirement of shaft seal supply vapour temperature tolerance to the shaft seal under cold starting, the accident circumstances usually.
However, the cold start of the traditional thermal power generating unit usually depends on starting a boiler, the starting boiler is operated by long-term fire suppression, the energy consumption is high, the pollution emission is high, and the environmental protection pressure is high. Therefore, a need exists in the art for a unit gas seal air supply system for cold start of a steam turbine that is more energy efficient and can effectively reduce pollutant emissions.
Disclosure of Invention
The utility model aims at overcoming the defects in the prior art and providing a more energy-saving and effectively pollution-reducing air-seal air supply system for a steam turbine cold-state start.
The utility model discloses a realize through following technical scheme: a unit air seal air supply system for cold start of a steam turbine comprises a high pressure cylinder shaft seal of a high pressure cylinder, a middle pressure cylinder shaft seal of a middle pressure cylinder and a low pressure cylinder shaft seal of a low pressure cylinder, and further comprises an adjacent auxiliary steam header, an auxiliary steam standby header, a shaft seal air supply header, a first pressure equalizing box and a second pressure equalizing box, wherein a first port of the adjacent auxiliary steam header is connected with an adjacent air supply pipeline, a second port of the adjacent auxiliary steam header is connected with a first port of the auxiliary steam standby header through a connecting pipeline, a second port of the auxiliary steam standby header is connected with a three-section steam extraction port of the middle pressure cylinder through a three-section steam extraction pipeline, a third port of the auxiliary steam standby header is connected with a first shaft seal inlet of the air supply header through a shaft seal header, a first outlet of the air supply header is connected with an inlet of the second pressure equalizing box through a low pressure shaft seal air supply pipeline, the outlet of the second pressure equalizing box is connected with the low-pressure cylinder shaft seal through a low-pressure shaft seal connecting pipeline, the second outlet of the shaft seal air supply header is connected with the first pressure equalizing box through a middle-high pressure shaft seal air supply pipeline, the first outlet of the first pressure equalizing box is connected with the high-pressure cylinder shaft seal through a high-pressure shaft seal connecting pipeline, and the second outlet of the first pressure equalizing box is connected with the middle-pressure cylinder shaft seal through a middle-pressure shaft seal connecting pipeline.
The steam outlet of the unit boiler is connected with the inlet of the interlayer heating header through an interlayer header connecting pipeline, the outlet of the interlayer heating header is connected with the second inlet of the shaft seal air supply header through an interlayer header connecting pipeline, the interlayer header connecting pipeline is provided with a first desuperheater, the middle-high pressure shaft seal air supply pipeline is provided with a second desuperheater, and the low-pressure shaft seal air supply pipeline is provided with a third desuperheater.
The middle-high pressure shaft seal air supply pipeline is connected with a spare manual valve branch in parallel, and the low pressure shaft seal air supply pipeline is connected with a spare manual valve branch in parallel.
The utility model has the advantages that: the utility model discloses cancelled this design of start-up boiler among the prior art, when cold starting, provide bearing seal steam through adjacent unit or this unit boiler, had better energy saving and emission reduction effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1-a high pressure cylinder; 2-intermediate pressure cylinder; 3-low pressure cylinder; 4-a unit boiler; 5-high pressure cylinder shaft seal; 6-intermediate pressure cylinder shaft seal; 7-low pressure cylinder shaft seal; 8-adjacent auxiliary steam header; 9-auxiliary steam standby header; 10-shaft seal air supply header; 11-interlayer heating header; 12-a first surge tank; 13-a second surge tank; 14-adjacent machine air supply pipeline; 15-connecting the pipeline; 16-three sections of steam extraction pipelines; 17-shaft seal header gas supply line; 18-middle and high pressure shaft seal gas supply pipeline; 19-low pressure shaft seal gas supply line; 20-high pressure shaft seal connecting pipeline; 21-a medium-pressure shaft seal connecting pipeline; 22-low pressure shaft seal connecting pipeline; 23-spare manual valve branch; 24-a first desuperheater; 25-a second desuperheater; 26-a third desuperheater; 27-interlayer header gas supply pipeline; 28-interlayer headers are connected with pipelines.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in figure 1, the unit gas seal gas supply system for cold start of the steam turbine comprises a high-pressure cylinder shaft seal 5 of a high-pressure cylinder 1, a middle-pressure cylinder shaft seal 6 of a middle-pressure cylinder 2 and a low-pressure cylinder shaft seal 7 of a low-pressure cylinder 3, and further comprises an adjacent auxiliary steam header 8, an auxiliary steam standby header 9, a shaft seal gas supply header 10, a first pressure equalizing tank 12 and a second pressure equalizing tank 13, wherein a first port of the adjacent auxiliary steam header 8 is connected with an adjacent air supply pipeline 14, a second port of the adjacent auxiliary steam header 8 is connected with a first port of the auxiliary steam standby header 9 through a connecting pipeline 15, a second port of the auxiliary steam standby header 9 is connected with a three-stage steam extraction port of the middle-pressure cylinder 2 through a three-stage steam extraction pipeline 16, a third port of the auxiliary steam standby header 9 is connected with a first inlet of the shaft seal gas supply header 10 through a shaft seal gas supply pipeline 17, and a first outlet of the gas supply header 10 is connected with an inlet of the second pressure equalizing tank 13 through a low-pressure equalizing pipeline 19 The outlet of the second pressure equalizing box 13 is connected with the low-pressure cylinder shaft seal 7 through a low-pressure shaft seal connecting pipeline 22, the second outlet of the shaft seal air supply header 10 is connected with the first pressure equalizing box 12 through a middle-high pressure shaft seal air supply pipeline 18, the first outlet of the first pressure equalizing box 12 is connected with the high-pressure cylinder shaft seal 5 through a high-pressure shaft seal connecting pipeline 20, and the second outlet of the first pressure equalizing box 12 is connected with the medium-pressure cylinder shaft seal 6 through a medium-pressure shaft seal connecting pipeline 21.
When one steam turbine set is started in a cold state after shutdown maintenance and the other steam turbine set works normally, the intermediate pressure cylinder 2 of the other steam turbine set can pump air and sequentially pass through the adjacent machine air supply pipeline 14, the adjacent machine auxiliary steam header 8, the connecting pipeline 15, the auxiliary steam standby header 9, the intermediate-high pressure shaft seal air supply pipeline 18 and the low pressure shaft seal air supply pipeline 19 to provide shaft seal steam for the steam turbine set. When the steam turbine set normally operates and the other steam turbine set is started in a cold state after shutdown maintenance, the steam turbine set provides shaft seal steam for the other steam turbine set through the three-section steam extraction pipeline 16, the auxiliary steam standby header 9, the connecting pipeline 15, the adjacent auxiliary steam header 8 and the adjacent air supply pipeline 14 of the intermediate pressure cylinder 2 in sequence.
Referring to fig. 1, the steam turbine further comprises a unit boiler 4 for providing working steam for the high-pressure cylinder 1 and an interlayer heating header 11 for providing hot steam for an interlayer of the high-pressure cylinder 1, a steam outlet of the unit boiler 4 is connected with an inlet of the interlayer heating header 11 through an interlayer header air supply pipeline 27, an outlet of the interlayer heating header 11 is connected with a second inlet of the shaft seal air supply header 10 through an interlayer header connecting pipeline 28, the interlayer header connecting pipeline 28 is provided with a first desuperheater 24, the medium-high pressure shaft seal air supply pipeline 18 is provided with a second desuperheater 25, and the low-pressure shaft seal air supply pipeline 19 is provided with a third desuperheater 26.
When two sets of steam turbine units are in a shutdown state and are started in a cold state, the unit boiler 4 sequentially passes through the interlayer header air supply pipeline 27, the interlayer heating header 11, the interlayer header air supply pipeline 27, the shaft seal air supply header 10, the middle-high pressure shaft seal air supply pipeline 18 and the low pressure shaft seal air supply pipeline 19 to supply shaft seal steam to the steam turbine units. Because the temperature and the pressure of the unit boiler 4 are high, in the process, the first desuperheater 24, the second desuperheater 25 and the third desuperheater 26 are required to desuperheat and decompress the steam, so that the shaft seal steam meets the requirements. The first desuperheater 24, the second desuperheater 25 and the third desuperheater 26 atomize the desuperheated water and then contact with steam in the pipeline, so that the functions of reducing temperature and pressure of the steam are achieved. The desuperheater is conventional and will not be described herein.
The middle-high pressure shaft seal air supply pipeline 18 is connected with a standby manual valve branch 23 in parallel, and the low pressure shaft seal air supply pipeline 19 is connected with a standby manual valve branch 23 in parallel. The middle-high pressure shaft seal air supply pipeline 18 and the low pressure shaft seal air supply pipeline 19 are both provided with electric valves, and when the electric valves break down, the standby manual valve branch 23 is opened to ensure the normal operation of the system.
It should be finally noted that the above only serves to illustrate the technical solution of the present invention, and not to limit the scope of the present invention, and that simple modifications or equivalent replacements performed by those skilled in the art to the technical solution of the present invention do not depart from the spirit and scope of the technical solution of the present invention.
Claims (3)
1. The utility model provides a unit atmoseal air feed system for steam turbine cold starting, includes the high pressure cylinder bearing seal of high pressure cylinder, the intermediate pressure cylinder bearing seal of intermediate pressure cylinder and the low pressure cylinder bearing seal of low pressure cylinder, its characterized in that: the first port of the adjacent auxiliary steam header is connected with the adjacent air supply pipeline, the second port of the adjacent auxiliary steam header is connected with the first port of the auxiliary steam spare header through a connecting pipeline, the second port of the auxiliary steam spare header is connected with the three-section steam extraction port of the medium pressure cylinder through a three-section steam extraction pipeline, the third port of the auxiliary steam spare header is connected with the first inlet of the air supply header through the shaft seal header air supply pipeline, the first outlet of the shaft seal air supply header is connected with the inlet of the second pressure equalizing box through a low pressure air supply pipeline, the outlet of the second pressure equalizing box is connected with the low pressure cylinder through a low pressure shaft seal connecting pipeline, and the second outlet of the air supply header is connected with the first pressure equalizing box through a medium and high pressure air supply pipeline, the first outlet of the first pressure equalizing box is connected with the high-pressure cylinder shaft seal through a high-pressure shaft seal connecting pipeline, and the second outlet of the first pressure equalizing box is connected with the intermediate-pressure cylinder shaft seal through an intermediate-pressure shaft seal connecting pipeline.
2. The unit gas seal air supply system for cold start of steam turbine of claim 1, wherein: the steam outlet of the unit boiler is connected with the inlet of the interlayer heating header through an interlayer header connecting pipeline, the outlet of the interlayer heating header is connected with the second inlet of the shaft seal air supply header through an interlayer header connecting pipeline, the interlayer header connecting pipeline is provided with a first desuperheater, the middle-high pressure shaft seal air supply pipeline is provided with a second desuperheater, and the low-pressure shaft seal air supply pipeline is provided with a third desuperheater.
3. The unit gas seal air supply system for cold start of steam turbine of claim 2, wherein: the middle-high pressure shaft seal air supply pipeline is connected with a spare manual valve branch in parallel, and the low pressure shaft seal air supply pipeline is connected with a spare manual valve branch in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057476.0U CN215170217U (en) | 2021-05-18 | 2021-05-18 | Unit air seal air supply system for cold start of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121057476.0U CN215170217U (en) | 2021-05-18 | 2021-05-18 | Unit air seal air supply system for cold start of steam turbine |
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| Publication Number | Publication Date |
|---|---|
| CN215170217U true CN215170217U (en) | 2021-12-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121057476.0U Expired - Fee Related CN215170217U (en) | 2021-05-18 | 2021-05-18 | Unit air seal air supply system for cold start of steam turbine |
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| CN (1) | CN215170217U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635758A (en) * | 2022-02-28 | 2022-06-17 | 西安热工研究院有限公司 | Ultra-supercritical unit shaft seal system and operation method |
| CN114934817A (en) * | 2022-04-28 | 2022-08-23 | 中国电建集团华东勘测设计研究院有限公司 | Shaft seal steam supply system of medium-low pressure cylinder type steam turbine and operation method |
-
2021
- 2021-05-18 CN CN202121057476.0U patent/CN215170217U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114635758A (en) * | 2022-02-28 | 2022-06-17 | 西安热工研究院有限公司 | Ultra-supercritical unit shaft seal system and operation method |
| CN114635758B (en) * | 2022-02-28 | 2024-05-07 | 西安热工研究院有限公司 | Ultra-supercritical unit shaft seal system and operation method |
| CN114934817A (en) * | 2022-04-28 | 2022-08-23 | 中国电建集团华东勘测设计研究院有限公司 | Shaft seal steam supply system of medium-low pressure cylinder type steam turbine and operation method |
| CN114934817B (en) * | 2022-04-28 | 2023-11-17 | 中国电建集团华东勘测设计研究院有限公司 | Shaft seal steam supply system of middle-low pressure cylinder type steam turbine and operation method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211214 |