CN204858732U - Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine - Google Patents
Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine Download PDFInfo
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- CN204858732U CN204858732U CN201520628610.6U CN201520628610U CN204858732U CN 204858732 U CN204858732 U CN 204858732U CN 201520628610 U CN201520628610 U CN 201520628610U CN 204858732 U CN204858732 U CN 204858732U
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Abstract
The utility model discloses an auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine, include for water pump drive steam turbine, generator, frequency conversion generating line and power frequency generating line, the income steam ports of giving the water pump drive steam turbine goes out the steam ports with the main steam turbine of power plant and is linked together, and the drive shaft of water -feeding pump is connected in the output shaft of giving the water pump drive steam turbine and the drive shaft of generator and the power plant, and the output of generator is connected with the frequency conversion generating line, and the power source of each load in the power plant is connected with frequency conversion generating line and power frequency generating line. The utility model discloses can use as variable frequency power supply, adopt the electrical power generating system load is gone on supplying power in to the power plant stability and security extremely strong.
Description
Technical field
The utility model relates to a kind of variable frequency power supply, is 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.
Utility model content
The purpose of this utility model is 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 described in the utility model 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 utility model has following beneficial effect:
The Controlling Auxiliaries in Power Plants frequency-converting power supply driven based on feed-water pump turbine described in the utility model 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 utility model.
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 utility model 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 described in the utility model 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 utility model 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 |
|---|---|---|---|
| CN201520628610.6U CN204858732U (en) | 2015-08-19 | 2015-08-19 | Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520628610.6U CN204858732U (en) | 2015-08-19 | 2015-08-19 | Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine |
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| CN204858732U true CN204858732U (en) | 2015-12-09 |
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| CN201520628610.6U Active CN204858732U (en) | 2015-08-19 | 2015-08-19 | Auxiliary engine variable frequency power supply system of power plant based on give drive of water pump drive steam turbine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098973A (en) * | 2015-08-19 | 2015-11-25 | 西安热工研究院有限公司 | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving |
| CN106849089A (en) * | 2017-03-24 | 2017-06-13 | 上海申能电力科技有限公司 | A kind of electric energy conversion and switching system, method and its application |
-
2015
- 2015-08-19 CN CN201520628610.6U patent/CN204858732U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098973A (en) * | 2015-08-19 | 2015-11-25 | 西安热工研究院有限公司 | Power plant auxiliary equipment variable-frequency power source system based on water-feeding pump driving steam turbine driving |
| CN106849089A (en) * | 2017-03-24 | 2017-06-13 | 上海申能电力科技有限公司 | A kind of electric energy conversion and switching system, method and its application |
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