CN202678979U - Variable-frequency general power system for thermal power plant - Google Patents
Variable-frequency general power system for thermal power plant Download PDFInfo
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- CN202678979U CN202678979U CN 201220009367 CN201220009367U CN202678979U CN 202678979 U CN202678979 U CN 202678979U CN 201220009367 CN201220009367 CN 201220009367 CN 201220009367 U CN201220009367 U CN 201220009367U CN 202678979 U CN202678979 U CN 202678979U
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Abstract
The utility model discloses a variable-frequency general power supply system for a thermal power plant. The system comprises a speed-adjustable steam turbine, a generator, a variable-frequency bus and a power-frequency bus, wherein the steam turbine drives the generator to generate power; the generator is connected with an electromotor of an auxiliary engine in the thermal power plant through the variable-frequency bus; the change of rotational speed of the steam turbine is realized by changing the steam feeding flow of the steam turbine, and the power generation frequency of the generator is changed accordingly, thereby changing the working rotational speed of the auxiliary engine which is connected with the variable-frequency bus. According to the variable-frequency general power supply system, no additional frequency converter is required, the system is simple, the problems brought by the application of the frequency converter are solved, the reliability is high, and the space occupation is relative small.
Description
Technical field
The utility model relates to a kind of frequency-converting power supply, relates in particular to a kind of Novel variable-frequency general supply system for the thermal power plant.
Background technology
In the production process in thermal power plant, water is heated in boiler and becomes steam, then utilizes steam pushing turbine rotation, drives the generator rotation, converts the chemical energy of fuel to electric energy.In the process of generating, the rotation subsidiary engines such as a large amount of Pumps ﹠ Fans that the thermal power plant is equipped with need to consume a large amount of electric energy.Present common practices is by station transformer, and electricity is drawn a part for the station-service subsidiary engine.
Thermal power plant is when engineering design, and generally by greatest requirements and add that certain surplus chooses the capacity of subsidiary engine, thereby the subsidiary engine in actual motion has larger allowance.And when the subsidiary engine of constant speed operation during not in operation under the full load, particularly in underrun, its operating efficiency can sharply descend, and this causes the serious waste of electric energy.If the employing variable-frequency control technique then can make the as close as possible efficient district, working point of subsidiary engine, and reduce to greatest extent the throttling loss of blower fan baffle plate, valve, the energy consumption when reduction equipment moves greatly, the useful life of extension device.Take blower fan as example, according to fluid mechanics principle, shaft power is directly proportional with the cube of rotating speed.When the Air Quantity Required minimizing, when rotation speed of fan reduced, the cube that its power is pressed rotating speed descended.Therefore, the energy-saving effect of variable-speed operation is considerable.
Variable-frequency control technique is current energy-saving and emission-reduction, improve technological process to improve the quality of products and to improve a kind of important means of environment, Promote Technology.Frequency control is with its excellent speed governing and play the advantage such as a braking ability, high efficiency, high power factor and power savings and be known as the most rising mode of speed regulation both at home and abroad.Power plant changes water pump or blower motor frequency by attached with frequency converters to reach at present, thereby changes the rotating speed of water pump or blower fan, improves its operational efficiency, reaches the energy-saving and emission-reduction purpose.
Conversion system mainly contains controllable silicon frequency conversion, fluid power coupling frequency conversion and magnetic couple frequency conversion now.In these three kinds of conversion systems, fluid power coupling frequency-converter power is large, and reliability is low, cost is low, and its efficient is directly proportional with the first power of rotating speed, and degree of regulation is low.Magnetic couple frequency conversion reliability is high, and cost is the highest, square being directly proportional of its efficient and rotating speed, and when rotating speed was low, efficient was low, and the installation site that the magnetic couple device need to change motor or equipment is installed in addition, removed original foundation of civil work.The controllable silicon conversion efficiency is the highest, and its efficient is not subjected to the impact of load variations, responds the soonest, and degree of regulation is the highest.In these three kinds of conversion methods, controllable silicon frequency conversion cost is placed in the middle.Consider the employing controllable silicon converter technique that the thermal power plant is more from the angle of cost and efficient.
Owing to have relatively high expectations to equipment dependability in the thermal power plant, the rotating machinery that adopts, large such as plant capacities such as circulating water pump, forced draft fans, electric pressure is high, thereby requires also high to the frequency converter that is used for firepower electrical plant.At present the frequency conversion equipment that adopts mainly adopts the controllable silicon technology in the power plant, and that the disadvantage of controllable silicon converter technique is electric pressure is higher, and its equipment dependability is lower, and the frequency conversion equipment floor space is large, and its frequency-conversion harmonic is all influential to electrical network and motor.Therefore, the controllable silicon converter technique is applied slower in the thermal power plant.Along with the development of technology, existing portioned product can address the above problem preferably at present, but because these product prices are high, has hindered its further popularization.
Therefore, the utility model be devoted to develop that a kind of cost is low, high reliability, high efficiency, simple frequency conversion general supply system.
The utility model content
In view of the defects of prior art, the purpose of this utility model provides that a kind of cost is lower, high reliability, high efficiency, relatively simple frequency conversion general supply system of system.
The utility model provides a kind of novel frequency conversion general supply: the small turbine that the working speed that its utilization arranges separately is adjustable promotes a generator, by the working speed of change small turbine, thus the frequency of the alternating current of change generator output.This generator provides the frequency conversion electrical source of power for all subsidiary engines that are connected on the same bus.Meanwhile, all subsidiary engines that are connected on this bus all are connected with one road power frequency supply in addition, as for subsequent use.Because the speed adjusting technique of steam turbine has developed very perfectly, so the generator that drives of small turbine can realize the speed governing of wide region, namely must not use the alternating current that frequency converter just can obtain required frequency.This frequency conversion general supply provides frequency the preliminary variable frequency power source of adjusting for all subsidiary engines that connect thereon, and the movable vane angle of the adjustment structure on each subsidiary engine such as valve, baffle plate or Axial Fan with Adjustable Vanes is finely tuned, to guarantee to satisfy production requirement.For example, with 95% supply frequency of the governor motion aperture of subsidiary engine that satisfy to regulate the aperture maximum as the variable frequency power source frequency.
The utility model is by setting up specific variable-frequency power generation unit, other auxiliary systems such as bus that it specifically overlaps by generator, steam turbine, corresponding transformer and for the frequency conversion generator assembly.By adjusting the aperture of steam turbine admission pitch, control enters the throttle flow of steam turbine, thereby reaches rotating speed and the power that changes steam turbine.Generator is directly driven by steam turbine, and its rotating speed is followed the rotation speed change of steam turbine and changed, thereby the frequency of its alternating current that sends also changes thereupon.Affected by it, the supply frequency that is connected to all electric motor of auxiliary machines on the bus also changes thereupon, and therefore the rotating speed of final rotary machine also changes.
The utility model provides a kind of frequency conversion general supply system for the thermal power plant, comprises steam turbine and generator, frequency conversion bus and power frequency bus that working speed is adjustable; Described steam turbine drags described generator generating; Described generator links to each other by the motor of frequency conversion bus with the subsidiary engine in described thermal power plant; Change turbine speed by the throttle flow that changes steam turbine, the generating frequency of the described generator of corresponding change, thus change the working speed of described frequency conversion subsidiary engine that bus connects.
In further execution mode, wherein also comprise power frequency supply, the motor of described subsidiary engine links to each other with described power frequency supply by described power frequency bus, so that when described steam turbine or described generator failure or other special operation conditions, can switch to rapidly power frequency supply, thereby guarantee unit safety operation.
In execution mode further, the motor of wherein said subsidiary engine links to each other with described frequency conversion bus by switch; The motor of described subsidiary engine links to each other with described power frequency bus by switch.
In execution mode further, wherein said subsidiary engine is a plurality of
Therefore, the utility model does not need extra frequency converter is set, and is simple.The generator that steam turbine of the present utility model drives can be realized full distance speed regulating, namely must not use the alternating current that frequency converter just can obtain required frequency.This system has overcome because of the problem of using frequency converter to bring, and reliability is high, takes up an area less.
Drawing gas of main steam turbine can be taken from the work vapour source of the used small turbine of the utility model.
Be described further below with reference to the technique effect of accompanying drawing to design of the present utility model, concrete structure and generation, to understand fully the purpose of this utility model, feature and effect.
Description of drawings
Fig. 1 is the system schematic of embodiment of the present utility model;
Mark among the figure:
T: steam turbine; V: adjuster valve; G: generator; A: frequency conversion bus; B: power frequency bus
1a, 2a, 3a ..., na: the switch between subsidiary engine and frequency conversion bus;
1b, 2b, 3b ..., nb: the switch between subsidiary engine and power frequency bus;
M
1, M
2, M
3M
nMotor for subsidiary engine
Embodiment
As shown in Figure 1, the utility model is a kind of for thermal power plant Novel variable-frequency general supply system, and it comprises T Steam Turbine, generator G, frequency conversion bus a and power frequency bus b.Subsidiary engine M
1, M
2, M
3M
nBy switch 1a, 2a, 3a ..., na links to each other with frequency conversion bus a, by 1b, and 2b, 3b ..., nb links to each other with power frequency bus b.By regulating the aperture of steam turbine entrance pitch V, just can change turbine speed, thereby change the frequency of the alternating current of generator output.This generator provides the frequency conversion electrical source of power for all subsidiary engines that are connected on the same bus.
In embodiment of the present utility model, also can be provided with the governor motions such as baffle plate or valve on the subsidiary engine of the present utility model.These governor motions can be finely tuned the operating condition of subsidiary engine, to satisfy production requirement.
The utility model changes the rotating speed of steam turbine by changing the steam turbine throttle flow, corresponding realization changes the frequency of subsidiary engine power supply that links to each other, thereby changes the running speed of these subsidiary engines.
More than describe specific embodiment of the utility model in detail.The ordinary skill that should be appreciated that this area need not creative work and just can make many modifications and variations according to design of the present utility model.Therefore, all in the art technical staff comply with design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in the determined protection range by claims.
Claims (4)
1. a frequency conversion general supply system that is used for the thermal power plant comprises steam turbine and generator, frequency conversion bus and power frequency bus that working speed is adjustable; Described steam turbine drags described generator generating; Described generator links to each other by the motor of frequency conversion bus with the subsidiary engine in described thermal power plant; Change turbine speed by the throttle flow that changes steam turbine, the generating frequency of the described generator of corresponding change, thus change the working speed of described frequency conversion subsidiary engine that bus connects.
2. frequency conversion general supply as claimed in claim 1 system, wherein also comprise power frequency supply, the motor of described subsidiary engine links to each other with described power frequency supply by described power frequency bus, so that when described steam turbine or described generator failure or other special operation conditions, can switch to rapidly power frequency supply, thereby guarantee unit safety operation.
3. frequency conversion general supply as claimed in claim 2 system, the motor of wherein said subsidiary engine links to each other with described frequency conversion bus by switch; The motor of described subsidiary engine links to each other with described power frequency bus by switch.
4. frequency conversion general supply as claimed in claim 3 system, wherein said subsidiary engine is a plurality of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220009367 CN202678979U (en) | 2012-01-10 | 2012-01-10 | Variable-frequency general power system for thermal power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220009367 CN202678979U (en) | 2012-01-10 | 2012-01-10 | Variable-frequency general power system for thermal power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202678979U true CN202678979U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220009367 Expired - Lifetime CN202678979U (en) | 2012-01-10 | 2012-01-10 | Variable-frequency general power system for thermal power plant |
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| CN (1) | CN202678979U (en) |
Cited By (5)
| 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 |
| CN103997277A (en) * | 2014-02-24 | 2014-08-20 | 冯伟忠 | Novel frequency conversion system for thermal power plant |
| 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 |
| CN106849090A (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 of new multiport and switching system |
| CN106887992A (en) * | 2017-03-24 | 2017-06-23 | 上海申能电力科技有限公司 | A kind of electric energy conversion of many buses and switching system |
-
2012
- 2012-01-10 CN CN 201220009367 patent/CN202678979U/en not_active Expired - Lifetime
Cited By (7)
| 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 |
| CN102570504B (en) * | 2012-01-10 | 2015-07-15 | 冯伟忠 | Frequency-conversion main power supply system for thermal power plant |
| CN103997277A (en) * | 2014-02-24 | 2014-08-20 | 冯伟忠 | Novel frequency conversion system for thermal power plant |
| CN103997277B (en) * | 2014-02-24 | 2018-03-27 | 冯伟忠 | A kind of frequency conversion system for thermal power plant |
| 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 |
| CN106849090A (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 of new multiport and switching system |
| CN106887992A (en) * | 2017-03-24 | 2017-06-23 | 上海申能电力科技有限公司 | A kind of electric energy conversion of many buses and switching system |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130116 |