CN105098973A - Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving - Google Patents
Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving Download PDFInfo
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- CN105098973A CN105098973A CN201510512459.4A CN201510512459A CN105098973A CN 105098973 A CN105098973 A CN 105098973A CN 201510512459 A CN201510512459 A CN 201510512459A CN 105098973 A CN105098973 A CN 105098973A
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Abstract
The invention discloses a power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving. The system comprises a water-feeding pump driving steam turbine, a power generator, a variable-frequency bus and a power frequency bus. A steam inlet of the water-feeding pump driving steam turbine is communicated with a steam outlet of a main steam turbine of a power plant; an output shaft of the water-feeding pump driving steam turbine is connected with a drive shaft of the power generator and a drive shaft of a water-feeding pump in the power plant; an output end of the power generator is connected with the variable-frequency bus; and a power interface of each load in the power plant is connected with the variable-frequency bus and the power frequency bus. The variable-frequency power source system can be used as a variable-frequency power source. With the power source system in the invention, stability and security of power supply for loads in the power plant are extremely high.
Description
Technical field
The present invention relates to a kind of variable frequency power supply, be specifically related to a kind of Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine.
Background technology
In the production run process in thermal power plant, need to operate a large amount of Pumps & Fans to maintain the thermodynamic cycle of whole turbo generator set, way current is at present that the electricity sent by unit by station-service high and low pressure transformer draws a part in order to drive subsidiary engine.
Choosing of thermal power plant subsidiary engine place capacity is generally design the demand of maximum duty according to Steam Turbine and add that certain surplus carrys out type selecting, and this has larger allowance with regard to making the subsidiary engine in actual motion.And the subsidiary engine device drives choice of electrical machine overwhelming majority is all non-variable-frequency motor, subsidiary engine equipment constant speed is run, and by flow restriction control flow, under unit running on the lower load, throttling loss significantly increases, and operational efficiency significantly declines, and causes a large amount of wastes of electric energy.
In recent years, along with the policy of energy-saving and emission-reduction is put into effect, the spread of every conservation measures, motor frequency conversion technology is adopted by increasing thermal power plant as the effective energy saving means of one.The Frequency Conversion Modification of current thermal power plant mainly by attached with frequency converters, makes the rotating speed of Pumps & Fans adjustable, improves its operating efficiency in each load section to reach energy-conservation object.
In actual use, although frequency converter has energy-efficient advantage, also there are some to the influential defect of power plant units safe operation: first, the frequency-conversion harmonic of frequency converter all has impact to electrical network and motor simultaneously; Secondly, the reliability of current frequency converter is still difficult to the requirement reaching thermal power plant, and in particular for the frequency converter that electric pressure is higher, plant maintenance requires high; In addition, frequency converter also exist equipment investment costly, machine operation temperature and the noise problem such as comparatively power frequency motor is large.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine, this power-supply system can use as variable frequency power supply, the stability adopting this power-supply system to power to load in power plant and fail safe extremely strong.
For achieving the above object, the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine of the present invention comprises feed-water pump turbine, generator, frequency conversion bus and power frequency bus;
The steam ports that enters of described feed-water pump turbine is connected with the main steam turbine venthole of power plant, the output shaft of feed-water pump turbine is connected with the driving shaft of water supply pump in the driving shaft of generator and power plant, the output of generator is connected with frequency conversion bus, and the power interface of each load in power plant is connected with frequency conversion bus and power frequency bus.
The power interface of each load in described power plant is all connected by the first switch with between frequency conversion bus.
The power interface of each load in described power plant is connected by second switch with between power frequency bus.
Valve is provided with between the main steam turbine venthole entering steam ports and power plant of described feed-water pump turbine.
The present invention has following beneficial effect:
The Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine of the present invention operationally, the rotating speed of feed-water pump turbine output shaft is controlled by the flow of the steam flow exported in main steam turbine phase feed-water pump turbine in adjustment power plant, rotated by the output axle driven dynamo of feed-water pump turbine again, the electric current that generator is exported realizes the object of frequency conversion, simple to operate, convenient, the electric current that generator exports simultaneously is input on frequency conversion bus, when powering to each load in power plant, frequency conversion bus or power frequency bus can be selected to realize powering to load each in power plant, thus improve stability and fail safe that load each in power plant is powered, practicality is extremely strong, and avoid the adverse effect that frequency of utilization device brings.
Further, valve is provided with between the main steam turbine venthole entering steam ports and power plant of feed-water pump turbine.During work, only need control valve just can complete the frequency conversion of output generator current, simple to operate, convenient.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Wherein, 1 be water supply pump, 2 be valve, 3 be feed-water pump turbine, 4 be generator, 5 be load for frequency conversion bus, 6 is the first switch, 7,8 be second switch, 9 for power frequency bus.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine of the present invention comprises feed-water pump turbine 3, generator 4, frequency conversion bus 5 and power frequency bus 9; The steam ports that enters of feed-water pump turbine 3 is connected with the main steam turbine venthole of power plant, the output shaft of feed-water pump turbine 3 is connected with the driving shaft of water supply pump 1 in the driving shaft of generator 4 and power plant, the output of generator 4 is connected with frequency conversion bus 5, and in power plant, the power interface of each load 7 is connected with frequency conversion bus 5 and power frequency bus 9; The power interface of each load 7 in power plant is all connected by the first switch 6 with between frequency conversion bus 5; The power interface of each load 7 in power plant is connected by second switch 8 with between power frequency bus 9; Valve 2 is provided with between the main steam turbine venthole entering steam ports and power plant of feed-water pump turbine 3.
Specific works process of the present invention is as follows:
The steam flow that in power plant, main steam turbine exports is input in feed-water pump turbine 3 through valve 2, and drive feed-water pump turbine 3 to work, water supply pump 1 in the output shaft drive electrical generators 4 of feed-water pump turbine 3 and power plant works, the electric current that generator 4 exports is input on frequency conversion bus 5, when needs carry out frequency conversion, the steam flow entering into feed-water pump turbine 3 is then regulated by valve 2, thus change the rotating speed of feed-water pump turbine 3 output shaft, and then the frequency of regulator generator 4 output current, the running speed of feed-water pump turbine 3 is changed along with the adjustment of generator 4 load, simple to operate, practicality is extremely strong, when powering to the load 7 in power plant, adopt frequency conversion bus 5 and power frequency bus 9 to select one to power, when generator 4 normally works, then open second switch 8, closed first switch 6, each load 7 in power plant is powered by frequency conversion bus 5, when generator 4 does not work, then open the first switch 6, closed second switch 8, each load 7 in power plant is powered by power frequency bus 9, and then effective improve stability and fail safe that load 7 each in power plant is powered, practicality is extremely strong.
Claims (4)
1. the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine, it is characterized in that, comprise feed-water pump turbine (3), generator (4), frequency conversion bus (5) and power frequency bus (9);
The steam ports that enters of described feed-water pump turbine (3) is connected with the main steam turbine venthole of power plant, the output shaft of feed-water pump turbine (3) is connected with the driving shaft of water supply pump (1) in the driving shaft of generator (4) and power plant, the output of generator (4) is connected with frequency conversion bus (5), and the power interface of each load (7) in power plant is connected with frequency conversion bus (5) and power frequency bus (9).
2. the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine according to claim 1, it is characterized in that, the power interface of each load (7) in described power plant is all connected by the first switch (6) with between frequency conversion bus (5).
3. the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine according to claim 1, it is characterized in that, the power interface of each load (7) in described power plant is connected by second switch (8) with between power frequency bus (9).
4. the Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine according to claim 1, it is characterized in that, between the main steam turbine venthole entering steam ports and power plant of described feed-water pump turbine (3), be provided with valve (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512459.4A CN105098973A (en) | 2015-08-19 | 2015-08-19 | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510512459.4A CN105098973A (en) | 2015-08-19 | 2015-08-19 | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving |
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| CN105098973A true CN105098973A (en) | 2015-11-25 |
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| CN201510512459.4A Pending CN105098973A (en) | 2015-08-19 | 2015-08-19 | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703676A (en) * | 2016-04-13 | 2016-06-22 | 冯伟忠 | Generalized frequency conversion system used for steam turbine generator unit |
| CN105863744A (en) * | 2016-04-29 | 2016-08-17 | 东南大学 | Safe variable-frequency power supply system for nuclear power unit |
| WO2017177612A1 (en) * | 2016-04-13 | 2017-10-19 | 冯伟忠 | Generalized frequency conversion system for steam turbine generator unit |
| CN114837756A (en) * | 2022-05-06 | 2022-08-02 | 西安热工研究院有限公司 | Back-heating power generation system based on BEST steam turbine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570504A (en) * | 2012-01-10 | 2012-07-11 | 冯伟忠 | Frequency-conversion main power supply system for thermal power plant |
| CN204858732U (en) * | 2015-08-19 | 2015-12-09 | 西安热工研究院有限公司 | Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine |
-
2015
- 2015-08-19 CN CN201510512459.4A patent/CN105098973A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570504A (en) * | 2012-01-10 | 2012-07-11 | 冯伟忠 | Frequency-conversion main power supply system for thermal power plant |
| CN204858732U (en) * | 2015-08-19 | 2015-12-09 | 西安热工研究院有限公司 | Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703676A (en) * | 2016-04-13 | 2016-06-22 | 冯伟忠 | Generalized frequency conversion system used for steam turbine generator unit |
| WO2017177612A1 (en) * | 2016-04-13 | 2017-10-19 | 冯伟忠 | Generalized frequency conversion system for steam turbine generator unit |
| US11329583B2 (en) | 2016-04-13 | 2022-05-10 | Weizhong Feng | Generalized frequency conversion system for steam turbine generator unit |
| CN105863744A (en) * | 2016-04-29 | 2016-08-17 | 东南大学 | Safe variable-frequency power supply system for nuclear power unit |
| CN114837756A (en) * | 2022-05-06 | 2022-08-02 | 西安热工研究院有限公司 | Back-heating power generation system based on BEST steam turbine |
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Application publication date: 20151125 |
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