CN110925038A - Steam turbine generator unit and starting method thereof - Google Patents
Steam turbine generator unit and starting method thereof Download PDFInfo
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- CN110925038A CN110925038A CN201911236282.4A CN201911236282A CN110925038A CN 110925038 A CN110925038 A CN 110925038A CN 201911236282 A CN201911236282 A CN 201911236282A CN 110925038 A CN110925038 A CN 110925038A
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- steam turbine
- air outlet
- pressure
- outlet pipe
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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
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/105—Final actuators by passing part of the fluid
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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)
Abstract
The invention discloses a steam turbine generator set, comprising: a generator; the output end of the steam turbine is in transmission connection with the generator; one end of the high-pressure air inlet pipe is communicated with the air inlet of the steam turbine, and the other end of the high-pressure air inlet pipe is communicated with an external boiler; one end of the medium-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the medium-pressure air outlet pipe is communicated with an external heat supply network, and a first air outlet valve is arranged on the medium-pressure air outlet pipe; one end of the low-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the low-pressure air outlet pipe is communicated with an external heat supply network, and a second air outlet valve is arranged on the low-pressure air outlet pipe; and the controller is electrically connected with the steam turbine, the first air outlet valve and the second air outlet valve respectively. When the steam turbine works stably, the outlet pressure is higher, and heat is supplied to the external heat supply network through the medium-pressure outlet pipe. Thereby avoiding the waste of working medium caused by air exhaust in the starting process of the steam turbine.
Description
Technical Field
The invention relates to the field of electricity, in particular to a steam turbine generator set and a starting method thereof.
Background
As is well known, the commercial power in China is 220V 50 Hz alternating current, and in order to meet the frequency requirement of 50 Hz, a steam turbine generator set can be butted with a generator after the rotating speed of a steam turbine reaches a preset rotating speed in the starting process. However, the air outlet pressure in the starting process of the steam turbine is smaller than the air outlet pressure when the steam turbine rotates at a stable speed, and the pressure supply requirement of a heat supply network cannot be met, so that the starting process of the steam turbine only adopts a rushing mode for air exhaust, working medium waste is caused, and meanwhile, the air exhaust process also has a serious noise problem.
Disclosure of Invention
The invention aims to overcome the technical defects and provides a method for solving the technical problems that working media are wasted on air exhaust and noise is generated in the starting process of a steam turbine generator set in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a steam turbine generator set, which comprises:
a generator;
the output end of the steam turbine is in transmission connection with the generator;
one end of the high-pressure air inlet pipe is communicated with the air inlet of the steam turbine, and the other end of the high-pressure air inlet pipe is communicated with an external boiler;
one end of the medium-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the medium-pressure air outlet pipe is communicated with an external heat supply network, and a first air outlet valve is arranged on the medium-pressure air outlet pipe;
one end of the low-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the low-pressure air outlet pipe is communicated with an external heat supply network, and a second air outlet valve is arranged on the low-pressure air outlet pipe;
and the controller is electrically connected with the steam turbine, the first air outlet valve and the second air outlet valve respectively.
Compared with the prior art, the invention has the beneficial effects that: before starting the unit, the first air outlet valve is closed under the control of the controller, the second air outlet valve is opened, high-pressure steam is provided by the external boiler, the high-pressure steam flows into the steam turbine through the high-pressure air inlet pipe, the turbine rotates in an accelerating manner under the driving of air flow, and then the air pressure of the air flow with partial energy damage is reduced, and heat is supplied to the external heat supply network through the low-pressure air outlet pipe. And when the steam turbine reaches the preset rotating speed, the steam turbine is butted with the generator, and the steam turbine is enabled to maintain constant-speed rotation to drive the generator to generate electricity. And the controller detects that the steam turbine reaches the preset rotating speed, then the first gas outlet valve is opened and the second gas outlet valve is closed, and the steam flowing out of the steam turbine supplies heat to the external heat supply network through the medium-pressure gas outlet pipe. The invention makes the air outlet of the steam turbine respectively communicate with the medium pressure air outlet pipe and the low pressure air outlet pipe with different back pressures, the air outlet pressure is smaller in the starting process of the steam turbine, and the heat is supplied to the external heating network through the low pressure air outlet pipe, and when the steam turbine works stably, the air outlet pressure is larger, and the heat is supplied to the external heating network through the medium pressure air outlet pipe. Thereby avoiding the waste of working medium caused by air exhaust in the starting process of the steam turbine and the noise problem caused by the process of spraying steam to air.
Drawings
Fig. 1 is a schematic structural diagram of a steam turbine generator set according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the present invention provides a steam turbine generator set, comprising: generator 100, steam turbine 200, high pressure inlet pipe 300, middling pressure outlet pipe 400 and low pressure outlet pipe 500.
The generator 100 is a conventional generator, and the specification adopted in this embodiment is that the preset rotation speed is 3000rpm, the output voltage is 220V, and the frequency is 50 hz mains supply.
And the steam turbine 200 is in transmission connection with the generator 100 and is used for driving the generator 100 to generate electricity, the specification of the steam turbine 200 is selected to be suitable for the specification of the generator 100, and the stable rotating speed of 3000rpm is maintained under the driving of high-pressure steam provided by an external boiler. In addition, it should be noted that, since the turbine 200 is not docked with the generator 100 until it reaches 3000rpm, the transmission connection between the turbine 200 and the generator 100 should include a clutch function. In addition, a rotational speed detector 210 is provided on the steam turbine 200 for detecting the real-time rotational speed of the steam turbine 200.
One end of the high pressure inlet pipe 300 is connected to an external boiler, and the other end of the high pressure inlet pipe is connected to an air inlet of the steam turbine 200, so that high pressure steam of the external boiler enters the steam turbine 200 through the high pressure inlet pipe 300, and an inlet valve 310 is further disposed on the high pressure inlet pipe 300 to control the on/off of the steam.
And one end of the medium pressure outlet pipe 400 is communicated with the external heating network, the other end of the medium pressure outlet pipe is connected with the air outlet of the steam turbine 200, and when the steam turbine 200 reaches a preset rotating speed and works stably, the medium pressure outlet pipe 400 supplies heat to the external heating network. Correspondingly, in order to control the on-off of the medium pressure outlet pipe 400, a first outlet valve 410 is arranged on the medium pressure outlet pipe 400. The end of the medium-pressure air outlet pipe 400 is also provided with a medium-pressure air distributing cylinder for distributing hot steam.
And a low pressure outlet duct 500 having one end connected to an external heating network and the other end connected to an outlet of the steam turbine 200, wherein steam in the steam turbine 200 supplies heat to the external heating network through the low pressure outlet duct 500 during a starting process of the steam turbine 200. Meanwhile, in order to control the on/off of the low pressure outlet pipe 500, a second outlet valve 510 is provided on the low pressure outlet pipe 500. The end of the low-pressure outlet pipe 500 is also provided with a low-pressure branch cylinder for dividing hot steam.
It should be noted that the steam turbine 200 is accelerated to rotate during the starting process, the outlet pressure is small, the low pressure outlet pipe 500 exhausts air to supply heat to the external heating network, and the outlet pressure is large when the rotating speed of the steam turbine 200 is stable, and the medium pressure outlet pipe 400 exhausts air to supply heat to the external heating network. Therefore, the heat supply network back pressure corresponding to the low pressure outlet pipe 400 should be smaller than that corresponding to the medium pressure outlet pipe 500.
And the controller 600 is electrically connected with the rotation speed detector 210, the first air outlet valve 410 and the second air outlet valve 510, and during the starting process of the steam turbine generator set, the controller 600 controls the first air outlet valve 410 to be closed and controls the second air outlet valve 420 to be opened at the same time. When the rotational speed detector 210 detects that the rotational speed of the steam turbine 200 reaches a predetermined rotational speed of 3000rpm, the controller controls the first outlet valve 410 to be opened and the second outlet valve 510 to be closed.
It is considered that during the start-up phase of the steam turbine 200, there is a possibility that the external boiler supply air is unstable, resulting in the outlet pressure of the steam turbine 200 being too low to be smaller than the back pressure of the low pressure outlet duct 500. In this special scenario, the steam turbine 200 still needs to exhaust air, so an exhaust branch 520 is further disposed on the low-pressure air outlet pipe 500, and an exhaust valve 521 is disposed on the exhaust branch, when the external boiler is unstable in air supply, the first air outlet valve 410 and the second air outlet valve 510 need to be closed, and the exhaust valve 521 is opened to exhaust air.
In the starting process of the steam turbine generator set provided by the present invention, the first air outlet valve 410 is closed and the second air outlet valve 510 is opened, so that the high pressure steam provided by the external boiler supplies heat to the steam turbine 200 through the high pressure air inlet pipe 300, the turbine of the steam turbine is accelerated to rotate by the air flow, and then the air pressure of the air flow losing part of the energy is reduced to supply heat to the external heat supply network through the low pressure air outlet pipe 500. Until the turbine 200 reaches the preset rotation speed, the generator 100 is connected in a butt joint mode, and the turbine 200 is enabled to rotate at a constant speed to drive the generator 100 to generate power. Then, the first gas outlet valve 410 is opened and the second gas outlet valve 510 is closed, and the gas flow from the turbine 200 supplies heat to the external heat supply network through the medium-pressure gas outlet pipe 400. The invention makes the air outlet of the steam turbine 200 communicate with the medium pressure air outlet pipe 400 and the low pressure air outlet pipe 500 with different back pressures respectively, the air outlet pressure is smaller in the starting process of the steam turbine so as to supply heat to the external heating network through the low pressure air outlet pipe 500, and when the steam turbine 200 works stably, the air outlet pressure is larger so as to supply heat to the external heating network through the medium pressure air outlet pipe 400. Thereby avoiding the waste of working medium caused by air exhaust in the starting process of the steam turbine 200 and the noise problem caused by the process of spraying steam to air.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (6)
1. A turbo generator set, comprising:
a generator;
the output end of the steam turbine is in transmission connection with the generator;
one end of the high-pressure air inlet pipe is communicated with the air inlet of the steam turbine, and the other end of the high-pressure air inlet pipe is communicated with an external boiler;
one end of the medium-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the medium-pressure air outlet pipe is communicated with an external heat supply network, and a first air outlet valve is arranged on the medium-pressure air outlet pipe;
one end of the low-pressure air outlet pipe is communicated with the air outlet of the steam turbine, the other end of the low-pressure air outlet pipe is communicated with an external heat supply network, and a second air outlet valve is arranged on the low-pressure air outlet pipe;
and the controller is electrically connected with the steam turbine, the first air outlet valve and the second air outlet valve respectively.
2. The steam turbine generator set of claim 1, wherein a speed detector is disposed on the steam turbine, the speed detector being electrically connected to the controller.
3. The steam turbine generator set of claim 1, wherein the low pressure outlet duct extends out of an exhaust branch, and an exhaust valve is disposed in the exhaust branch.
4. The steam turbine generator set according to claim 1, wherein a low pressure gas distributing cylinder is disposed at a terminal end of the low pressure gas outlet pipe, and a medium pressure gas distributing cylinder is disposed at a terminal end of the medium pressure gas outlet pipe.
5. A method for starting a steam turbine generator set according to any one of claims 1 to 4, comprising:
s1, detecting the rotating speed of the steam turbine, and determining that the rotating speed of the steam turbine is zero and is in a shutdown state;
s2, closing the first gas outlet valve, opening the second gas outlet valve, supplying gas to the steam turbine by the external boiler through the high-pressure gas inlet pipe, driving the steam turbine to rotate by the gas flow, and supplying heat to an external heat supply network by the gas flow in the steam turbine through the low-pressure gas outlet pipe;
s3, monitoring the rotating speed of the steam turbine in real time;
s4, when the rotating speed of the steam turbine reaches a preset rotating speed, the steam turbine is in butt joint with a generator to drive the generator to rotate to generate electricity;
and S5, opening the first gas outlet valve, closing the second gas outlet valve, and supplying heat to an external heat supply network through a medium-pressure gas outlet pipe by gas flow in the steam turbine.
6. The steam turbine generator set starting method of claim 5, wherein the predetermined speed of the steam turbine is 3000 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911236282.4A CN110925038A (en) | 2019-12-05 | 2019-12-05 | Steam turbine generator unit and starting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911236282.4A CN110925038A (en) | 2019-12-05 | 2019-12-05 | Steam turbine generator unit and starting method thereof |
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| CN110925038A true CN110925038A (en) | 2020-03-27 |
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| CN201911236282.4A Pending CN110925038A (en) | 2019-12-05 | 2019-12-05 | Steam turbine generator unit and starting method thereof |
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Citations (6)
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|---|---|---|---|---|
| CN107387182A (en) * | 2017-09-04 | 2017-11-24 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of back pressure turbine starts Analysis of Exhaust Steam Recovering System |
| CN108167032A (en) * | 2017-12-26 | 2018-06-15 | 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 and method |
| CN108506058A (en) * | 2018-05-16 | 2018-09-07 | 西安西热节能技术有限公司 | A kind of external steam-supplying system of cogeneration units Saving energy in Steam Turbine |
| CN108518253A (en) * | 2018-05-16 | 2018-09-11 | 西安西热节能技术有限公司 | A kind of cogeneration units Saving energy in Steam Turbine heating system |
| CN109404063A (en) * | 2018-10-22 | 2019-03-01 | 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院 | A kind of back pressure type heat supply steam turbine energy conservation regulating system |
| CN110425012A (en) * | 2019-08-16 | 2019-11-08 | 上海电气电站设备有限公司 | Small turbine Back pressure adjusting system and method |
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2019
- 2019-12-05 CN CN201911236282.4A patent/CN110925038A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| CN107387182A (en) * | 2017-09-04 | 2017-11-24 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of back pressure turbine starts Analysis of Exhaust Steam Recovering System |
| CN108167032A (en) * | 2017-12-26 | 2018-06-15 | 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 and method |
| CN108506058A (en) * | 2018-05-16 | 2018-09-07 | 西安西热节能技术有限公司 | A kind of external steam-supplying system of cogeneration units Saving energy in Steam Turbine |
| CN108518253A (en) * | 2018-05-16 | 2018-09-11 | 西安西热节能技术有限公司 | A kind of cogeneration units Saving energy in Steam Turbine heating system |
| CN109404063A (en) * | 2018-10-22 | 2019-03-01 | 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院 | A kind of back pressure type heat supply steam turbine energy conservation regulating system |
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Non-Patent Citations (1)
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Application publication date: 20200327 |
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