CN114109525A - Steam turbine shaft seal system - Google Patents
Steam turbine shaft seal system Download PDFInfo
- Publication number
- CN114109525A CN114109525A CN202111317212.9A CN202111317212A CN114109525A CN 114109525 A CN114109525 A CN 114109525A CN 202111317212 A CN202111317212 A CN 202111317212A CN 114109525 A CN114109525 A CN 114109525A
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- China
- Prior art keywords
- steam
- steam turbine
- shaft seal
- heater
- seal
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- 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.)
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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
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
- F01D25/10—Heating, e.g. warming-up before starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
- F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention relates to the technical field of steam turbines, in particular to a steam turbine shaft seal system, which comprises: the system comprises a main steam valve, a steam turbine, a generator, a low-pressure heater and a steam seal heater; the steam turbine is a backpressure machine after the extraction condensing unit is modified; the main steam valve is connected with a steam turbine, and the steam turbine is connected with a generator; the steam turbine is connected with the low-pressure heater through a steam seal steam pipeline; the steam turbine is connected with the steam seal heater through a steam exhaust pipeline. The steam turbine shaft seal system provided by the invention adopts the front shaft seal leakage steam as a steam source to heat the feed water, realizes the recycling of heat energy, and has the characteristics of small reconstruction project engineering quantity, low reconstruction cost, less thermal pollution and high thermal economic benefit.
Description
Technical Field
The invention relates to the technical field of steam turbines, in particular to a steam turbine shaft seal system.
Background
In recent years, as China has more extraction condensing steam turbines or condensing steam turbines with long operation time, and the units have the problems of early design age, poor thermal performance, high heat consumption, low efficiency and the like, in order to solve the problems, improve the operation reliability of the units, prolong the service life of the units and the like, power plants are generally transformed into backpressure machines.
At present, the medium and small-sized back press in China has no low-pressure heat recovery system, and only uses high-pressure section steam extraction to heat the deaerator to supply water, so that huge heat loss is caused. The backpressure machine can not form a self-sealing state due to special steam discharge parameters, and the backpressure machine after being modified particularly has the defects of steam leakage and the like of a steam seal, so that the heat pollution of a factory building on site is serious, and the serious environmental pollution is caused.
Meanwhile, the user has urgent requirements for the high demand of power plant equipment and the current situation of the steam turbine transformation technology, and a novel steam seal transformation scheme is required.
Disclosure of Invention
The invention provides a steam turbine shaft seal system, aiming at the technical problems that steam seal steam leakage exists in a steam extraction condensing unit for improving a back pressure machine in the prior art, so that the field workshop is seriously polluted by heat, the serious environmental pollution is caused, and the energy is wasted.
The technical scheme for solving the technical problems is as follows:
a steam turbine shaft seal system comprising: the system comprises a main steam valve, a steam turbine, a generator, a low-pressure heater and a steam seal heater;
the steam turbine is a backpressure machine after the extraction condensing unit is modified;
the main steam valve is connected with the steam turbine, and the steam turbine is connected with the generator;
the steam turbine is connected with the low-pressure heater through a steam seal steam pipeline; the steam turbine is connected with the steam seal heater through a steam exhaust pipeline.
Further, the method also comprises the following steps: adjusting a valve;
and the main steam valve is connected with the steam turbine through the regulating valve.
Further, the method also comprises the following steps: a steam extraction device; the steam seal heater is connected with the steam extraction equipment.
Further, the method also comprises the following steps: a steam pipeline of an original extraction condensing unit;
and the main steam valve is connected with the steam turbine through a steam pipeline of the original extraction condensing unit.
Further, the method also comprises the following steps: a high-pressure heater and a steam extraction pipeline;
and the steam turbine is connected with the high-pressure heater through the steam extraction pipeline.
The steam turbine shaft seal system provided by the invention at least has the following beneficial effects or advantages:
the invention provides a steam turbine shaft seal system.A steam turbine is a backpressure machine after a condensing unit is transformed, a main steam valve is connected with the steam turbine, and the steam turbine is connected with a generator; the steam turbine is connected with the low-pressure heater through a steam seal steam pipeline; the steam turbine is connected with the steam seal heater through a steam exhaust pipeline. According to the steam turbine shaft seal system provided by the invention, steam transmitted from a boiler is transmitted to a steam turbine through a main steam valve, and the steam expands to work to drive a generator to generate electricity; and (3) leaking steam from the shaft seal which does not work in the steam turbine, introducing one part of the leaked steam into the low-pressure heater for regenerative utilization, and introducing the other part of the leaked steam into the steam seal heater for heat exchange. The steam turbine shaft seal system provided by the invention adopts the front shaft seal leakage steam as a steam source to heat the feed water, realizes the recycling of heat energy, and has the characteristics of small reconstruction project engineering quantity, low reconstruction cost, less thermal pollution and high thermal economic benefit.
Drawings
Fig. 1 is a schematic structural diagram of a steam turbine shaft seal system according to an embodiment of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-main steam valve, 2-regulating valve, 3-steam turbine, 4-generator, 5-steam seal heater, 6-low pressure heater and 7-high pressure heater.
Detailed Description
The invention provides a steam turbine shaft seal system, aiming at the technical problems that steam seal steam leakage exists in a steam extraction condensing unit for improving a back pressure machine in the prior art, so that the field workshop is seriously polluted by heat, the serious environmental pollution is caused, and the energy is wasted.
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that terms such as "upper", "lower", "front", "rear", "left", "right", and the like in the embodiments indicate terms of orientation, and are used only for simplifying the positional relationship based on the drawings of the specification, and do not represent that the elements, devices, and the like indicated in the description must operate according to the specific orientation and the defined operation, method, and configuration, and such terms are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in conjunction with specific situations.
An embodiment of the present invention provides a steam turbine shaft seal system, referring to fig. 1, which mainly includes: the system comprises a main steam valve 1, a steam turbine 3, a generator 4, a low-pressure heater 6 and a gland sealing heater 5. The steam turbine 3 is a backpressure machine after the extraction condensing unit is modified, and the modification method adopts the existing mainstream method for modifying the backpressure machine by using the old extraction condensing unit, and the detailed description is not given; the low-pressure heater 6 adopts the low-pressure heater 6 of the original old type extraction and coagulation unit. The main steam valve 1 is connected with the steam turbine 3 in a pipeline connection mode, and the main steam valve 1 has a quick closing function. Steam transmitted from the boiler is transmitted to a steam turbine 3 through a main steam valve 1, the steam turbine 3 is connected with a generator 4, and the steam expands to work to drive the generator 4 to generate power. The steam turbine 3 is connected with the low-pressure heater 6 through a steam seal steam pipeline; the steam turbine 3 is connected with a steam seal heater 5 through a steam exhaust pipeline. And one part of shaft seal leakage steam which does not do work in the steam turbine 3 is introduced into the low-pressure heater 6 for regenerative utilization, and the other part of shaft seal leakage steam enters the steam seal heater 5 for heat exchange.
To achieve the adjustment of the steam flow, referring to fig. 1, the embodiment of the present invention further includes: the valve 2 is adjusted. The main steam valve 1 is connected to a steam turbine 3 via a control valve 2. The steam output from the main steam valve 1 enters the steam turbine 3 after the flow of the steam is adjusted by the adjusting valve 2. By adjusting the steam flow, the amount of working steam in the steam turbine 3 can be controlled, and the power of the generator 4 can be further controlled.
After the heat exchange is performed by the steam seal heater 5, a part of uncondensed steam still exists, and in order to further process the part of uncondensed steam, referring to fig. 1, a preferred embodiment provided by the invention is provided with: a steam extraction device; the steam seal heater 5 is connected with steam extraction equipment. The uncondensed steam is extracted by the steam extraction equipment connected with the steam seal heater 5, so that the balance of the steam turbine 3 is not influenced by the fact that air does not enter the steam turbine 3 while the steam does not leak outwards.
The steam turbine shaft seal system provided by the embodiment of the invention is formed by modifying a condensing unit, and in order to improve the utilization rate of original components of the condensing unit as much as possible, referring to fig. 1, a preferred embodiment provided by the invention is further provided with: the steam pipeline of the original extraction condensing unit. The main steam valve 1 is connected with the steam turbine 3 through a steam pipeline of an original extraction condensing unit, so that the steam pipeline of the original extraction condensing unit is recycled, and the reconstruction cost is reduced.
With further reference to fig. 1, the above embodiment describes the recycling of shaft seal leakage steam which does not work in the steam turbine 3, and for the reuse of a part of steam (the pressure is greater than 0.1MPa) of the steam turbine 3 after work is done, a preferred embodiment provided by the present invention further includes: a high-pressure heater 7 and a steam extraction pipeline; the steam turbine 3 is connected to a high-pressure heater 7 via a steam extraction line. And a part of steam after the steam turbine 3 does work enters the high-pressure heater 7 for regenerative utilization.
For the machine set which is reconstructed at present, when the low-pressure heater 6 is detached, the pressure equalizing box or the positive-pressure steam seal heater 5 is required to be supplemented to be used as the recovery of steam seal leakage, thereby reducing the economic efficiency of machine set reconstruction and increasing the reconstruction difficulty and the reconstruction engineering quantity. The embodiment of the invention provides a brand-new low-pressure heater 6, which does not adopt a mode of heating water supply by regenerative steam extraction, adopts front shaft seal leakage steam as a steam source to heat water supply, improves the reconstruction economy, reduces the reconstruction engineering quantity and realizes the recovery of heat energy.
Meanwhile, the steam turbine shaft seal system provided by the embodiment of the invention has the characteristics of small modification project engineering amount, low modification cost, less thermal pollution and high thermal economic benefit, and is characterized in that other equipment is not added in the shaft seal system of the modification scheme, and the pressure equalizing box or the positive pressure steam seal heater 5 is not added while the low pressure heater 6 is not detached.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. A steam turbine shaft seal system, comprising: the system comprises a main steam valve (1), a steam turbine (3), a generator (4), a low-pressure heater (6) and a steam seal heater (5);
the steam turbine (3) is a backpressure machine after the extraction condensing unit is transformed;
the main steam valve (1) is connected with the steam turbine (3), and the steam turbine (3) is connected with the generator (4);
the steam turbine (3) is connected with the low-pressure heater (6) through a steam seal steam pipeline; and the steam turbine (3) is connected with the steam seal heater (5) through a steam exhaust pipeline.
2. The steam turbine shaft seal system of claim 1 further comprising: a regulating valve (2);
the main steam valve (1) is connected with the steam turbine (3) through the regulating valve (2).
3. The steam turbine shaft seal system of claim 1 further comprising: a steam extraction device; the steam seal heater (5) is connected with the steam extraction equipment.
4. The steam turbine shaft seal system according to any one of claims 1 to 3 further comprising: a steam pipeline of an original extraction condensing unit;
the main steam valve (1) is connected with the steam turbine (3) through a steam pipeline of the original extraction condensing unit.
5. The steam turbine shaft seal system according to any one of claims 1 to 3 further comprising: a high-pressure heater (7) and a steam extraction pipeline;
and the steam turbine (3) is connected with the high-pressure heater (7) through the steam extraction pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111317212.9A CN114109525A (en) | 2021-11-08 | 2021-11-08 | Steam turbine shaft seal system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111317212.9A CN114109525A (en) | 2021-11-08 | 2021-11-08 | Steam turbine shaft seal system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114109525A true CN114109525A (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111317212.9A Pending CN114109525A (en) | 2021-11-08 | 2021-11-08 | Steam turbine shaft seal system |
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| CN (1) | CN114109525A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4329875B1 (en) * | 2008-06-05 | 2009-09-09 | 三浦工業株式会社 | Steam system |
| CN201671660U (en) * | 2010-05-06 | 2010-12-15 | 中国长江动力公司(集团) | Steam turbine with steam extraction being changed into back pressure type |
| CN201714437U (en) * | 2010-06-08 | 2011-01-19 | 中国长江动力公司(集团) | Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type |
| CN205638580U (en) * | 2016-05-25 | 2016-10-12 | 陕西华富新能源有限公司 | System of recycling is retrieved to gland leak off |
| CN208310859U (en) * | 2018-05-02 | 2019-01-01 | 华北电力大学 | A kind of double reheat system of efficient backheat and optimization steam extraction |
| CN209780975U (en) * | 2019-04-09 | 2019-12-13 | 哈尔滨汽轮机厂有限责任公司 | 135MW superhigh pressure backpressure heat supply reforms transform steam turbine |
| CN112682115A (en) * | 2020-12-18 | 2021-04-20 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
-
2021
- 2021-11-08 CN CN202111317212.9A patent/CN114109525A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4329875B1 (en) * | 2008-06-05 | 2009-09-09 | 三浦工業株式会社 | Steam system |
| CN201671660U (en) * | 2010-05-06 | 2010-12-15 | 中国长江动力公司(集团) | Steam turbine with steam extraction being changed into back pressure type |
| CN201714437U (en) * | 2010-06-08 | 2011-01-19 | 中国长江动力公司(集团) | Steam turbine with steam extraction back pressure type changed from double-steam-extraction condensing type |
| CN205638580U (en) * | 2016-05-25 | 2016-10-12 | 陕西华富新能源有限公司 | System of recycling is retrieved to gland leak off |
| CN208310859U (en) * | 2018-05-02 | 2019-01-01 | 华北电力大学 | A kind of double reheat system of efficient backheat and optimization steam extraction |
| CN209780975U (en) * | 2019-04-09 | 2019-12-13 | 哈尔滨汽轮机厂有限责任公司 | 135MW superhigh pressure backpressure heat supply reforms transform steam turbine |
| CN112682115A (en) * | 2020-12-18 | 2021-04-20 | 山东齐鲁电机制造有限公司 | High back pressure transformation method based on extraction condensing turbine |
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