CN108167032B - NCB type heating turbine back pressure mode starting system and method - Google Patents
NCB type heating turbine back pressure mode starting system and method Download PDFInfo
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- CN108167032B CN108167032B CN201711431465.2A CN201711431465A CN108167032B CN 108167032 B CN108167032 B CN 108167032B CN 201711431465 A CN201711431465 A CN 201711431465A CN 108167032 B CN108167032 B CN 108167032B
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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
- F01D19/00—Starting of machines or engines; Regulating, controlling, or safety means in connection therewith
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a back pressure mode starting system and a back pressure mode starting method of an NCB heat supply turbine, wherein the system comprises a generator, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a 3S clutch, an evacuating device and a heating network heater; the medium pressure cylinder is connected with a first exhaust pipeline, a second exhaust pipeline and a third exhaust pipeline, the input end of the first exhaust pipeline is provided with a first valve, and the output end of the first exhaust pipeline is connected with a heating network heater; the input end of the second exhaust pipeline is provided with a second valve, and the output end of the second exhaust pipeline is connected with the low-pressure cylinder; the input end of the third exhaust pipeline is provided with a third valve, and the output end of the third exhaust pipeline is connected with an emptying device; the medium pressure cylinder is also connected with a medium pressure bypass for discharging the heating and boosting steam of the boiler into the heating network heater, and the medium pressure bypass is provided with a fourth valve. The invention reduces a great amount of working medium and heat loss in the starting process; complex operation of cutting off low-cylinder operation after the unit is started with the low-pressure cylinder is avoided, operation workload is reduced, and operation risk is reduced; the starting time of the unit is shortened.
Description
Technical Field
The invention relates to the technical field of thermal power generation, in particular to a back pressure mode starting system and method of an NCB heat supply turbine.
Background
The NCB type heat supply turbo generator set comprises shafting arranged as follows: generator, high pressure cylinder, well pressure cylinder, 3S clutch, low pressure cylinder. The unit is used for pure condensation power generation in a non-heating period, is used for condensation heat supply in a primary and final heating period, and is used for pure back pressure heat supply in a tip cold period. The back pressure heat supply operation mode is the most economical operation mode because no cold source is lost and the generating and heat supply efficiency of the unit is the highest.
When NCB turbine set adopts pure back pressure mode heat supply operation, only keep generator, high-middle cylinder operation through the disconnection of 3S clutch, direct heating network steam extraction by medium-pressure cylinder steam extraction simultaneously, i.e. the pure back pressure heat supply operation mode of well row.
The NCB type unit is configured with a plurality of start modes according to the bypass system. When the unit is started during heat supply, if the unit is started by adopting the low-pressure cylinder, the low-pressure cylinder is cut off to operate after the grid connection is started and the load is given, so that an economic operation mode of back pressure heat supply is realized. In the starting process of the low-pressure cylinder, a large amount of cold source loss is caused, meanwhile, the starting process time of the unit is long, the back pressure economic operation mode of the unit is not easy to realize as soon as possible, and the operation cost is increased.
In addition, the operation of the process of cutting off the low-pressure cylinder after grid connection is complex, and shafting instability is also very easy to cause. The light ones delay the start-up time, the heavy ones cause shafting unstability and unit to stop abnormally, cause the heating loss promptly, also cause the civil question that influences resident's heating.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a back pressure mode starting system and method for an NCB type heating turbine, which directly realize back pressure mode starting without a low-pressure cylinder by utilizing the meshing and disengaging functions of a 3S clutch and cooling a middle cylinder steam-discharging cold source of a heating network heater in a unit heating period.
The invention provides a back pressure mode starting system of an NCB heat supply turbine, which comprises a generator, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a 3S clutch, an evacuating device and a heating network heater, wherein the generator is connected with the high-pressure cylinder; the generator is connected with the high-pressure cylinder, the high-pressure cylinder is connected with the medium-pressure cylinder, the medium-pressure cylinder is connected with the 3S clutch, and the 3S clutch is connected with the low-pressure cylinder;
the medium pressure cylinder is connected with a first exhaust pipeline, a second exhaust pipeline and a third exhaust pipeline, the input end of the first exhaust pipeline is provided with a first valve, and the output end of the first exhaust pipeline is connected with a heating network heater;
the input end of the second exhaust pipeline is provided with a second valve, and the output end of the second exhaust pipeline is connected with the low-pressure cylinder;
the input end of the third exhaust pipeline is provided with a third valve, and the output end of the third exhaust pipeline is connected with an emptying device;
the medium pressure cylinder is also connected with a medium pressure bypass for discharging the heating and boosting steam of the boiler into the heating network heater, and the medium pressure bypass is provided with a fourth valve;
when the heat supply network heater is operated, the second valve is used for isolating steam inlet of the low-pressure cylinder, and the 3S clutch is used for disengaging the low-pressure cylinder.
Further, the evacuation device is replaced with a condenser.
The invention also provides a back pressure mode starting method of the back pressure mode starting system of the NCB heat supply turbine, which comprises the following steps:
before starting the flushing rotation of the NCB heat supply turbine unit in the heat supply period, the heating and boosting steam of the boiler is discharged into a heating network heater through a medium-pressure bypass and a fourth valve so as to be matched with the starting of the boiler;
when the back pressure mode of the NCB type heating turbine unit in the heating period starts to perform the flushing, the low-pressure cylinder is disconnected through the 3S clutch, the second valve is closed to block the steam inlet of the low-pressure cylinder, the high-pressure cylinder and the medium-pressure cylinder are combined to perform the steam inlet flushing start and the speed rise, and the steam discharged by the medium-pressure cylinder enters the emptying device;
after the back pressure mode of the heat supply unit is started and connected with the power grid and loaded, the exhaust steam of the medium pressure cylinder is gradually switched into the heat supply network heater, the unit realizes the back pressure mode loaded operation, and the whole process of starting the back pressure mode of the boiler lifting parameters, the unit flushing, the lifting speed, the connected with the power grid and loaded is completed.
By means of the scheme, the back pressure mode starting system and method of the NCB heat supply turbine reduce a great amount of working medium and heat loss in the starting process, and the cold source loss of the back pressure mode is 0%, so that the cold source loss-free mode from the starting of the unit to the on-load operation is realized; the complex operation of cutting off the low-pressure cylinder operation after the unit is started with the low-pressure cylinder is avoided, the operation workload (about 30%) is reduced, and the operation risk is reduced; shortens the starting time (about 2 hours) of the unit.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of the back pressure mode starting system of an NCB heating turbine according to the present invention.
Reference numerals in the drawings:
a 1-generator; 2-a high-pressure cylinder; 3-a medium pressure cylinder; a 4-3S clutch; 5-a low pressure cylinder; 6-evacuating device (condenser); 7-a heating network heater; 8-a first valve; 9-a second valve; 10-a third valve; 11-fourth valve.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, this embodiment shows a back pressure mode starting system of an NCB type heating turbine, which includes a generator 1, a high pressure cylinder 2, a medium pressure cylinder 3, a 3S clutch 4, a low pressure cylinder 5, an evacuation device 6 (or condenser), a heat supply network heater 7, a connecting pipeline and a third valve 10 between the medium pressure cylinder 3 and the evacuation device 6, a connecting pipeline and a second valve 9 between the medium pressure cylinder 3 and the low pressure cylinder 5, a connecting pipeline and a first valve 8 between the medium pressure cylinder 3 and the heat supply network heater 7, and a medium pressure bypass and a fourth valve 11.
One path of exhaust steam of the medium pressure cylinder 3 can enter the emptying device 6 through a connecting pipeline and a third valve 10; one path of exhaust steam of the medium pressure cylinder 3 can enter the low pressure cylinder 5 through a connecting pipeline and a second valve 9; one path of exhaust steam of the medium pressure cylinder 3 can enter the heating network heater 7 through a connecting pipeline and a first valve 8.
The medium pressure cylinder 3 is also provided with a medium pressure bypass for discharging the boiler heating and boosting steam into the heat supply network heater 7, and the medium pressure bypass is provided with a fourth valve 11.
When the heat supply network is put into operation and the heat supply network heater 7 is operated, the second valve 9 can isolate steam inlet of the low-pressure cylinder, the 3S clutch 4 is disconnected from the low-pressure cylinder, so that the high-medium-pressure rotor is started in a flushing mode to realize the back pressure mode starting and the direct back pressure power generation and heat supply operation of the unit, the cold source loss in the starting process is reduced, and meanwhile, the switching operation of the low cylinder after the combined starting of the high-medium-low-pressure cylinder is reduced.
The back pressure mode starting method of the system comprises the following steps:
1) Before the NCB unit in the heating period starts to perform flushing, a bypass pipeline and a valve 11 can be adopted to discharge the heating and boosting steam of the boiler into the heating network heater 7 in order to cooperate with the starting of the boiler.
2) When the back pressure mode of the heat supply period unit starts the flushing, the low pressure cylinder 5 is disconnected through the 3S clutch 4, a connecting pipeline between the isolation low pressure cylinders 5 and the second valve 9 are closed to isolate the steam inlet of the low pressure cylinder 5, the high pressure cylinder 2 and the medium pressure cylinder 3 are utilized to combine the steam inlet flushing start and the speed rise, and the steam exhaust of the medium pressure cylinder 3 enters the emptying device 6.
3) After the back pressure mode of the heat supply unit is started and grid connection and a certain load is carried out (5%), the exhaust steam of the medium pressure cylinder 3 is gradually switched to enter the heat supply network heater 7, the unit realizes the back pressure mode on-load operation, and the whole process of starting the back pressure mode of the boiler on-load, such as parameter rising, unit flushing, speed rising, grid connection and on-load is completed.
As the NCB heating unit is started in a back pressure mode in the heating period, the low-pressure cylinder does not enter steam in the whole process of boiler lifting parameters, unit flushing, lifting speed, grid connection and on-load, and the running without cold source loss can be realized. Firstly, the working medium and heat loss in the starting process are reduced until the cold source loss in the back pressure mode is 0%, namely, the cold source loss-free mode from the starting of the unit to the on-load operation is realized, secondly, the complex operation of cutting off the low-cylinder operation after the unit is started with the low-pressure cylinder is avoided, the operation workload is reduced by about 30%, the operation risk is also reduced, and thirdly, the starting time of the unit is shortened by about 2 hours.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (2)
1. The back pressure mode starting method based on the NCB type heat supply turbine back pressure mode starting system is characterized in that the NCB type heat supply turbine back pressure mode starting system comprises the following steps: the system comprises a generator, a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder, a 3S clutch, an evacuating device and a heating network heater; the generator is connected with the high-pressure cylinder, the high-pressure cylinder is connected with the medium-pressure cylinder, the medium-pressure cylinder is connected with the 3S clutch, and the 3S clutch is connected with the low-pressure cylinder;
the medium pressure cylinder is connected with a first exhaust pipeline, a second exhaust pipeline and a third exhaust pipeline, the input end of the first exhaust pipeline is provided with a first valve, and the output end of the first exhaust pipeline is connected with the heating network heater;
the input end of the second exhaust pipeline is provided with a second valve, and the output end of the second exhaust pipeline is connected with the low-pressure cylinder;
the input end of the third exhaust pipeline is provided with a third valve, and the output end of the third exhaust pipeline is connected with the emptying device;
the medium-pressure cylinder is also connected with a medium-pressure bypass for discharging the boiler heating and boosting steam into the heat supply network heater, and the medium-pressure bypass is provided with a fourth valve;
the back pressure mode starting method comprises the following steps:
when the heat supply network heater operates, the second valve is used for isolating steam inlet of the low-pressure cylinder, and the 3S clutch is used for disengaging the low-pressure cylinder;
before starting the flushing rotation of the NCB heat supply turbine unit in the heat supply period, discharging the heating and boosting steam of the boiler into the heating network heater through the medium-pressure bypass and the fourth valve so as to be matched with the starting of the boiler;
when the back pressure mode of the NCB type heating turbine unit in the heating period starts the flushing, the low-pressure cylinder is disconnected through the 3S clutch, the second valve is closed to block the steam inlet of the low-pressure cylinder, the high-pressure cylinder and the medium-pressure cylinder are combined to enter the steam for flushing, start and speed rise, and the steam discharged by the medium-pressure cylinder enters the emptying device;
after the back pressure mode of the heat supply unit is started and connected with the power grid and loaded, the exhaust steam of the medium pressure cylinder is gradually switched into the heat supply network heater, the unit realizes the back pressure mode loaded operation, and the whole process of starting the back pressure mode of the boiler lifting parameters, the unit flushing, the lifting speed, the connected with the power grid and loaded is completed.
2. A method for back pressure mode starting based on NCB type heating turbine back pressure mode starting system according to claim 1, wherein the evacuating device is replaced by a condenser.
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| CN201711431465.2A CN108167032B (en) | 2017-12-26 | 2017-12-26 | NCB type heating turbine back pressure mode starting system and method |
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| CN110925038A (en) * | 2019-12-05 | 2020-03-27 | 华能应城热电有限责任公司 | Steam turbine generator unit and starting method thereof |
| CN114810250A (en) * | 2022-04-14 | 2022-07-29 | 重庆赛迪热工环保工程技术有限公司 | Power generation thermodynamic system for reducing heat loss of steam turbine exhaust |
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| US2902831A (en) * | 1958-08-22 | 1959-09-08 | Gen Electric | Governing system for reheat steam turbine powerplant |
| SU1092288A1 (en) * | 1983-02-07 | 1984-05-15 | Предприятие П/Я А-3513 | Extraction turbine low-pressure cylinder |
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| CN106285796A (en) * | 2016-10-28 | 2017-01-04 | 山东电力建设第工程公司 | The auxiliary steam intermediate pressure cylinder start-up method of steam turbine |
| CN106894855A (en) * | 2017-04-01 | 2017-06-27 | 祝凤娟 | A kind of thermoelectricity decoupling transformation and operation method based on heat source side and heat supply network comprehensive adjustment |
| CN207892663U (en) * | 2017-12-26 | 2018-09-21 | 中国大唐集团科学技术研究院有限公司火力发电技术研究所 | A kind of NCB types heat supply steam turbine back pressure pattern activation system |
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2017
- 2017-12-26 CN CN201711431465.2A patent/CN108167032B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2902831A (en) * | 1958-08-22 | 1959-09-08 | Gen Electric | Governing system for reheat steam turbine powerplant |
| SU1092288A1 (en) * | 1983-02-07 | 1984-05-15 | Предприятие П/Я А-3513 | Extraction turbine low-pressure cylinder |
| CN103016083A (en) * | 2012-12-26 | 2013-04-03 | 北京国电蓝天节能科技开发有限公司 | Back pressure and straight condensing switching heat supply system |
| CN104405459A (en) * | 2014-11-21 | 2015-03-11 | 华电国际电力股份有限公司技术服务中心 | Backpressure machine acting and heat supply device for steam exhaust heat supply network of intermediate pressure cylinder of steam turbine |
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| CN106894855A (en) * | 2017-04-01 | 2017-06-27 | 祝凤娟 | A kind of thermoelectricity decoupling transformation and operation method based on heat source side and heat supply network comprehensive adjustment |
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