CN103953401B - High-and-medium pressure cylinder of steam turbine for thermal power plant - Google Patents
High-and-medium pressure cylinder of steam turbine for thermal power plant Download PDFInfo
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- CN103953401B CN103953401B CN201410181286.8A CN201410181286A CN103953401B CN 103953401 B CN103953401 B CN 103953401B CN 201410181286 A CN201410181286 A CN 201410181286A CN 103953401 B CN103953401 B CN 103953401B
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Abstract
The invention discloses a high-and-medium pressure cylinder of a steam turbine for a thermal power plant. The high-and-medium pressure cylinder comprises a high-and-medium pressure outer cylinder, a high-and-medium pressure inner cylinder, a high-and-medium pressure cylinder shaft seal and an interlayer steam pipeline, wherein the inner wall of the high-and-medium pressure inner cylinder and the outer wall of the high-and-medium pressure inner cylinder form a high-and-medium pressure cylinder interlayer cavity; a steam inlet end of the interlayer steam pipeline is communicated with the high-and-medium pressure cylinder shaft seal; the steam outlet end of the interlayer steam pipeline is communicated with the high-and-medium pressure cylinder interlayer cavity; an interlayer steam isolating valve is arranged at the high point of the interlayer steam pipeline; a condensate drain valve for discharging condensate from the interlayer steam pipeline is arranged at the low point of the interlayer steam pipeline. The high-and-medium pressure cylinder is simple in structure; the structure of the original equipment is not required to be changed; steam of the high-and-medium pressure cylinder shaft seal is introduced into the high-and-medium pressure cylinder interlayer cavity for heating the outer wall of the high-and-medium pressure inner cylinder by utilizing cylinder holes in the high-and-medium pressure outer cylinder, so as to reduce the temperature difference between the high-and-medium pressure outer cylinder and the high-and-medium pressure inner cylinder, or even make the temperature difference between the high-and-medium pressure outer cylinder and the high-and-medium pressure inner cylinder be zero; the problem that the high-and-medium pressure inner cylinder is deformed by great temperature difference between the high-and-medium pressure outer cylinder and the high-and-medium pressure inner cylinder is avoided.
Description
Technical field
The present invention relates to Steam Turbine in Fire Power Plant equipment, be specifically related to a kind of Steam Turbine in Fire Power Plant high intermediate pressure cylinder.
Background technique
The steam turbine that existing thermal power plant uses, adopts HP-IP combined casing structure, usually as Supercritical 600 MW Steam Turbine.Its high pressure inner casing have employed the structure of one, and inner casing axial length is 3480mm.One of distinct issues the most in using, high intermediate pressure cylinder inside and outside cylinder relative dead center concave, convex axial seal facial disfigurement, seal failure etc., cause the steam discharge of high-pressure cylinder about 330 DEG C along the inside and outside cylinder interlayer of high pressure and the reverse flow of high-pressure inner cylinder flow passage component steam, enter the inside and outside 3 sections of chambers that draw gas of intermediate pressure cylinder.Contrast according to the data of unit operation, cause 3 sections of extraction temperatures to decline, even also low than design load.When unit normally runs, after high-pressure regulation level, the inside and outside wall temperature difference of inner casing all reaches more than 100 DEG C, cause inner casing junction plane gross distortion, maximal clearance of dehiscing in split during free state reaches more than 3.4mm, this directly reduces unit performance (Security, Economy, capacity).
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of Steam Turbine in Fire Power Plant high intermediate pressure cylinder that can reduce the inside and outside temperature difference of the cylinder of high intermediate pressure cylinder.
For solving the problems of the technologies described above, the technical solution used in the present invention is as follows:
Steam Turbine in Fire Power Plant high intermediate pressure cylinder, comprise High-and-medium Pressure Outer Casing, high pressure inner casing and high intermediate pressure cylinder shaft seal, High-and-medium Pressure Outer Casing inwall and high pressure inner casing outer wall form high intermediate pressure cylinder interlayer cavity, also comprise a jacket steam pipeline, admission end and the high intermediate pressure cylinder shaft seal of this jacket steam pipeline are connected, its steam output end and high intermediate pressure cylinder interlayer cavity are connected, the height point of jacket steam pipeline is provided with interlayer vapour separating valve, the low spot of jacket steam pipeline is provided with the water of condensation drain valve for discharging in jacket steam pipeline.
In order to the pressure of steam to high intermediate pressure cylinder interlayer cavity can be reduced, with be rapidly to intermediate pressure cylinder side diffusion, with the outer wall of the whole high pressure inner casing of homogeneous heating, the steam output end of described jacket steam pipeline is connected from high-pressure cylinder side and high intermediate pressure cylinder interlayer cavity, the steam output end of jacket steam pipeline connects the elbow pipeline that points to intermediate pressure cylinder, this elbow pipeline, through the steam retaining ring on high pressure inner casing outer wall, is also provided with the steam nozzle pointing to intermediate pressure cylinder at swan neck way outlet.
Technique scheme also comprises the interlayer cavity hydrophobic pipeline connected with high intermediate pressure cylinder interlayer cavity, the low spot of jacket steam pipeline is connected with condensate drain pipe road, the other end on this condensate drain pipe road is connected with interlayer cavity hydrophobic pipeline, condensate drain pipe road arranges described water of condensation drain valve, interlayer cavity hydrophobic pipeline is provided with outer shell drain valve.
In order to balance the steam flow between high, intermediate pressure cylinder interlayer, the steam retaining ring on high pressure inner casing outer wall is provided with resistance vapour sheet.
Compared with prior art, other structures of the present invention are the same with the structure of existing equipment, unlike adding jacket steam pipeline, utilize the cylinder holes on High-and-medium Pressure Outer Casing, the steam of high intermediate pressure cylinder shaft seal is introduced in high intermediate pressure cylinder interlayer cavity by jacket steam pipeline, in order to heat high pressure inner casing outer wall, and then in reduction high intermediate pressure cylinder, outer temperature difference of the cylinder, even make in high intermediate pressure cylinder, outer shell temperature is close, avoid because of in high intermediate pressure cylinder, outer temperature difference of the cylinder is large, and the problem making high pressure inner casing be out of shape occurs, not only increase the Safety performance of steam turbine high intermediate pressure cylinder, also improve the efficiency of unit.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Number in the figure is: 1, High-and-medium Pressure Outer Casing; 2, high pressure inner casing; 3, high intermediate pressure cylinder shaft seal; 4, jacket steam pipeline; 5, interlayer vapour separating valve; 6, water of condensation drain valve; 7, condensate drain pipe road; 8, elbow pipeline; 9, steam retaining ring; 10, steam nozzle; 11, interlayer cavity hydrophobic pipeline; 12, outer shell drain valve; 13, vapour sheet is hindered; 14, Low Temperature Steam pipeline.
Embodiment
As shown in Figure 1, for the structural representation of a kind of thermal power generation station-service of the present invention steam turbine high intermediate pressure cylinder, it comprises High-and-medium Pressure Outer Casing 1, high pressure inner casing 2, high intermediate pressure cylinder shaft seal 3 and jacket steam pipeline 4, and High-and-medium Pressure Outer Casing 1 inwall and high pressure inner casing 2 outer wall form high intermediate pressure cylinder interlayer cavity.Shown in jacket steam pipeline 4 admission end and high intermediate pressure cylinder shaft seal 3 is connected, its steam output end and high intermediate pressure cylinder interlayer cavity are connected, the height point of jacket steam pipeline 4 is provided with interlayer vapour separating valve 5, the low spot of jacket steam pipeline 4 is provided with the condensate drain pipe road 7 for discharging water of condensation in jacket steam pipeline 4, and this condensate drain pipe road 7 is provided with water of condensation drain valve 6.
The steam output end of described jacket steam pipeline 4 can from any place access high intermediate pressure cylinder interlayer cavity of High-and-medium Pressure Outer Casing 1, but due in the high pressure inner casing 2 of high-pressure cylinder side, outer wall temperature difference is larger, in order to high pressure inner casing 2 outer wall of high-temperature steam heating high-pressure cylinder side faster can be made, in the preferred embodiment, the steam output end of described jacket steam pipeline 4 is connected from high-pressure cylinder side and high intermediate pressure cylinder interlayer cavity, the steam output end of jacket steam pipeline 4 connects the elbow pipeline 8 that points to intermediate pressure cylinder, this elbow pipeline 8 is through the steam retaining ring 9 on thick stick outer wall in high pressure, the steam nozzle 10 being also provided with and pointing to intermediate pressure cylinder is exported at elbow pipeline 8.Steam retaining ring 9 on high pressure inner casing 2 outer wall is also provided with resistance vapour sheet 13.
The present invention also comprises the interlayer cavity hydrophobic pipeline 11 connected with high intermediate pressure cylinder interlayer cavity, and the lower end on described condensate drain pipe road 7 is connected with interlayer cavity hydrophobic pipeline 11, and interlayer cavity hydrophobic pipeline 11 is provided with outer shell drain valve 12.
As shown in Figure 1, the high pressure inner casing 2 of high-pressure cylinder side is connected to a Low Temperature Steam pipeline 14, the Low Temperature Steam in high pressure inner casing 2 is delivered to reheater by this Low Temperature Steam pipeline 14, carries out heating recycling to Low Temperature Steam.Low Temperature Steam pipeline 14 picks out hydrophobic pipeline, in order to discharge the water of condensation on Low Temperature Steam pipeline 14.
Claims (4)
1. thermal power generation station-service steam turbine high intermediate pressure cylinder, comprise High-and-medium Pressure Outer Casing (1), high pressure inner casing (2) and high intermediate pressure cylinder shaft seal (3), High-and-medium Pressure Outer Casing (1) inwall and high pressure inner casing (2) outer wall form high intermediate pressure cylinder interlayer cavity, it is characterized in that: also comprise a jacket steam pipeline (4), admission end and the high intermediate pressure cylinder shaft seal (3) of this jacket steam pipeline (4) are connected, its steam output end and high intermediate pressure cylinder interlayer cavity are connected, the height point of jacket steam pipeline (4) is provided with interlayer vapour separating valve (5), the low spot of jacket steam pipeline (4) is provided with the drain valve for discharging water of condensation in jacket steam pipeline (4).
2. thermal power generation station-service steam turbine high intermediate pressure cylinder according to claim 1, it is characterized in that: the steam output end of described jacket steam pipeline (4) is connected from high-pressure cylinder side and high intermediate pressure cylinder interlayer cavity, the steam output end of jacket steam pipeline (4) connects the elbow pipeline (8) that points to intermediate pressure cylinder, this elbow pipeline (8), through the steam retaining ring (9) on high pressure inner casing (2) outer wall, is also provided with in elbow pipeline (8) outlet the steam nozzle (10) pointing to intermediate pressure cylinder.
3. thermal power generation station-service steam turbine high intermediate pressure cylinder according to claim 1, it is characterized in that: also comprise the interlayer cavity hydrophobic pipeline (11) connected with high intermediate pressure cylinder interlayer cavity, the low spot of jacket steam pipeline (4) is connected with condensate drain pipe road (7), the other end on this condensate drain pipe road (7) is connected with interlayer cavity hydrophobic pipeline (11), condensate drain pipe road (7) arrange described water of condensation drain valve (6), interlayer cavity hydrophobic pipeline (11) is provided with outer shell drain valve (12).
4. the thermal power generation station-service steam turbine high intermediate pressure cylinder according to claim 1-3 any one, is characterized in that: the steam retaining ring (9) on high pressure inner casing (2) outer wall is also provided with resistance vapour sheet (13).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181286.8A CN103953401B (en) | 2014-04-30 | 2014-04-30 | High-and-medium pressure cylinder of steam turbine for thermal power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410181286.8A CN103953401B (en) | 2014-04-30 | 2014-04-30 | High-and-medium pressure cylinder of steam turbine for thermal power plant |
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| CN103953401A CN103953401A (en) | 2014-07-30 |
| CN103953401B true CN103953401B (en) | 2015-04-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104481604B (en) * | 2014-12-16 | 2016-03-23 | 东方电气集团东方汽轮机有限公司 | Steam turbine high-pressure cylinder interlayer heating system |
| CN106194284B (en) * | 2016-07-22 | 2017-07-28 | 东方电气集团东方汽轮机有限公司 | A kind of method of the parameter adjustment of steam turbine jacket steam and operation |
| CN111042876B (en) * | 2019-12-20 | 2022-05-10 | 东方电气集团东方汽轮机有限公司 | Built-in interlayer heating device for steam turbine cylinder |
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| US3070962A (en) * | 1961-11-06 | 1963-01-01 | Gen Electric | Steam seal diverting valve |
| US5018356A (en) * | 1990-10-10 | 1991-05-28 | Westinghouse Electric Corp. | Temperature control of a steam turbine steam to minimize thermal stresses |
| JP2001082109A (en) * | 1999-09-09 | 2001-03-27 | Mitsubishi Heavy Ind Ltd | Ultra-high temperature power generation system |
| CN1890457A (en) * | 2003-12-11 | 2007-01-03 | 西门子公司 | Use of a thermal insulating layer for a housing of a steam turbine and a steam turbine |
| CN102562187A (en) * | 2011-12-21 | 2012-07-11 | 上海发电设备成套设计研究院 | High-and-medium-pressure integrated cylinder for air cooling type high-parameter steam turbine |
| EP2511485A1 (en) * | 2011-04-15 | 2012-10-17 | Siemens Aktiengesellschaft | Turbomachine, Steam Turbine plant, and Method for heating a steam turbine shaft |
| CN202832677U (en) * | 2012-07-30 | 2013-03-27 | 浙江浙能能源技术有限公司 | Steam flow control device for high pressure cylinder interlayer of steam turbine |
| CN203906021U (en) * | 2014-04-30 | 2014-10-29 | 国投钦州发电有限公司 | Steam turbine high and intermediate pressure cylinder for thermal power stations |
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2014
- 2014-04-30 CN CN201410181286.8A patent/CN103953401B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3070962A (en) * | 1961-11-06 | 1963-01-01 | Gen Electric | Steam seal diverting valve |
| US5018356A (en) * | 1990-10-10 | 1991-05-28 | Westinghouse Electric Corp. | Temperature control of a steam turbine steam to minimize thermal stresses |
| JP2001082109A (en) * | 1999-09-09 | 2001-03-27 | Mitsubishi Heavy Ind Ltd | Ultra-high temperature power generation system |
| CN1890457A (en) * | 2003-12-11 | 2007-01-03 | 西门子公司 | Use of a thermal insulating layer for a housing of a steam turbine and a steam turbine |
| EP2511485A1 (en) * | 2011-04-15 | 2012-10-17 | Siemens Aktiengesellschaft | Turbomachine, Steam Turbine plant, and Method for heating a steam turbine shaft |
| CN102562187A (en) * | 2011-12-21 | 2012-07-11 | 上海发电设备成套设计研究院 | High-and-medium-pressure integrated cylinder for air cooling type high-parameter steam turbine |
| CN202832677U (en) * | 2012-07-30 | 2013-03-27 | 浙江浙能能源技术有限公司 | Steam flow control device for high pressure cylinder interlayer of steam turbine |
| CN203906021U (en) * | 2014-04-30 | 2014-10-29 | 国投钦州发电有限公司 | Steam turbine high and intermediate pressure cylinder for thermal power stations |
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| CN103953401A (en) | 2014-07-30 |
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