CN201318304Y - Frequency conversion control device for air cooling blower - Google Patents
Frequency conversion control device for air cooling blower Download PDFInfo
- Publication number
- CN201318304Y CN201318304Y CNU2008201701846U CN200820170184U CN201318304Y CN 201318304 Y CN201318304 Y CN 201318304Y CN U2008201701846 U CNU2008201701846 U CN U2008201701846U CN 200820170184 U CN200820170184 U CN 200820170184U CN 201318304 Y CN201318304 Y CN 201318304Y
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- Prior art keywords
- air cooling
- circuit
- frequency
- blower
- cooling blower
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- Expired - Fee Related
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- Control Of Ac Motors In General (AREA)
Abstract
The utility model discloses a frequency conversion control device for an air cooling blower, which comprises an isolating switch, a circuit breaker, an AC input reactor, a filter and a frequency converter which are sequentially connected and are connected with a power source, and an AC output reactor connected with the air cooling blower. The frequency converter is connected with a DCS control circuit in a hard-wired mode or a communication mode, and a frequency converter control circuit is connected to the frequency converter. The frequency conversion control device can automatically adjust the rotate speed of the blower automatically, stop or start the blower or enable the blower to rotate positively and reversely to adjust the air intake amount of the air-cooled condenser according to the load changes of the power plant generator, thus reaching the purposes of saving energy and starting and stopping the blower smoothly.
Description
Technical field
The utility model relates to a kind of control gear, specifically is the frequency-converting control device at air cooling blower fan, is specially adapted to adopt the power station of air cooling blower fan.
Background technique
China is an energy country based on coal resources, and wherein coal fired power generation accounts for 70% of whole power supplys, yet China still is the country of a serious water shortage, and shortage of water resources has become the principal element of restriction socio-economic development.Along with developing rapidly of power industry, big capacity, high parameter turbine unit constantly increase in the Power Plant in China, and these units have also consumed great lot of water resources when using a large amount of coals.Particularly power plant can not be built because of " rich coal lack of water " in the west area, develop these regional energy, and it is effective measures that power station gas-turbine condensing system adopts air cooling system.
Air cooling system mainly contains three kinds at present, i.e. direct air cooling, surface condenser indirect air cooling system and direct-contact type condenser indirect air cooling system.Direct air cooling system is meant that turbine discharge is condensed into water by air cooling in the finned-tube bundle of air cooling condenser, and the heat exchange between steam discharge and the air is finished in the surface-type air cooling condenser.Direct air cooling system can be economized on water in a large number because of it, thereby can make power plant's addressing not limited by the water source.
The regulative mode of large-scale air cooling unit blower fan has three kinds of single speeds, double speed, frequency control of motor speed.In recent years, Direct Air-cooled Unit adopts the frequency control of motor speed blower fan mostly.
Summary of the invention
It is the air cooling blower fan control gear of core with the frequency variator that the utility model provides a kind of, it can be according to the Power Plant load variations, realize regulating automatically rotation speed of fan, stop and start fortune blower fan or use the positive and negative air output of regulating air cooling condenser that transfers of blower fan, reach energy saving, steadily the effect of start and stop.
A kind of air cooling blower fan frequency-converting control device, comprise the isolating switch that is connected with power supply, circuit breaker, interchange input reactance device, wave filter, frequency variator and the interchange out put reactor that is connected with air cooling blower fan that connect successively, frequency variator is connected with the DCS control circuit by the mode of hardwire or communication, and transducer control circuit is connected to frequency variator.
Described frequency variator is a voltage frequency converter, and threephase AC is by output PWM ripple behind the frequency variator, the running of control air cooling blower fan.
Between power supply and frequency variator, obvious sectioning---isolating switch must be installed, personal security when guaranteeing device maintenance.
Must be before the frequency variator according to circuit breaker with overcurrent protection, the expansion of fault coverage when avoiding fault.
When waveform distortion of the power supply network is serious, exchange the interactional demand that the input reactance device can satisfy higher harmonics between frequency variator and the power supply, can improve the power factor of frequency variator input side simultaneously; Exchanging out put reactor can suppress high frequency oscillation when frequency variator surpasses 80m to the line of motor, avoid electrical machine insulation to damage, electric leakage is excessive and frequency variator is frequently protected.
Wave filter can suppress to disturb from the high-frequency noise that the converter power supply line sends.
The DCS control circuit can be according to different steam loads and ambient temperature, and the input of control frequency variator is to reach control air cooling blower fan start and stop and running.
Transducer control circuit can be provided with according to function and other requirements of frequency variator, comprises that as transducer control circuit an active circuit, activates relay, a timer relay, a timer switch, activates relay and is connected to frequency variator; Timer switch and switching circuit and the circuit that connects are in series with the circuit that activates relay and connect the timer relay, and the active circuit lotus root is connected to switching circuit.This control circuit can be lower than in the pressure drop of power supply and is predefined on time, makes circuit continue conducting in the predetermined time cycle, and blower fan is remained in operation.
Adopt the air cooling blower fan of the utility model device control, except that can be energy-conservation, variable frequency regulating speed control can also realize motor " soft start ", be motor in very low frequency (3～5Hz) and voltage startup down, improve the frequency and the voltage of power supply gradually, control motor non-impacting start under less than 1.1 times of rated current.The rotating speed of blower fan can move in (30%～110%) rated speed in addition, and is easy to adjust, satisfies the requirement of unit operation operating mode under various weather conditionss.The slow-speed of revolution that blower fan needs through being everlasting is operation down, and noise and wearing and tearing are all low than rated speed, help environmental protection, reduces maintenance expenses and has prolonged life-span of air cooling device.
Description of drawings
Fig. 1 is the utility model control gear structured flowchart;
Fig. 2 is the transducer control circuit block diagram.
Embodiment
As shown in Figure 1, a kind of air cooling blower fan frequency-converting control device, comprise the isolating switch that is connected with power supply, circuit breaker, interchange input reactance device, wave filter, frequency variator and the interchange out put reactor that is connected with air cooling blower fan that connect successively, frequency variator is connected with the DCS control circuit by the mode of hardwire or communication, and frequency variator also is connected with transducer control circuit.As shown in Figure 2, transducer control circuit comprises that an active circuit, activates relay, a timer relay, a timer switch, activates relay and is connected to frequency variator; Timer switch and switching circuit and the circuit that connects are in series with the circuit that activates relay and connect the timer relay, and the active circuit lotus root is connected to switching circuit.
Described frequency variator is a voltage frequency converter, and threephase AC passes through to export the PWM ripple behind isolating switch, circuit breaker, interchange input reactance device, wave filter, frequency variator, the interchange out put reactor, the running of control air cooling blower fan.
Between electrical network and frequency variator, obvious sectioning---isolating switch must be installed, personal security when guaranteeing device maintenance.
Must be before the frequency variator according to circuit breaker with overcurrent protection, the expansion of fault coverage when avoiding fault.
When waveform distortion of the power supply network is serious, exchange the interactional demand that the input reactance device can satisfy higher harmonics between frequency variator and the power supply, can improve the power factor of frequency variator input side simultaneously; Exchanging out put reactor can suppress high frequency oscillation when frequency variator surpasses 80m to the line of motor, avoid electrical machine insulation to damage, electric leakage is excessive and frequency variator is frequently protected.
Wave filter can suppress to disturb from the high-frequency noise that the converter power supply line sends.
The DCS control circuit can be according to different steam loads and ambient temperature, and the input of control frequency variator is to reach control air cooling blower fan start and stop and running.
Claims (2)
1, a kind of air cooling blower fan frequency-converting control device, it is characterized in that: comprise the isolating switch that is connected with power supply, circuit breaker, interchange input reactance device, wave filter, frequency variator and the interchange out put reactor that is connected with air cooling blower fan that connect successively, described frequency variator is connected with the DCS control circuit by the mode of hardwire or communication, and transducer control circuit is connected to frequency variator.
2, air cooling blower fan frequency-converting control device as claimed in claim 1 is characterized in that: described transducer control circuit comprises that an active circuit, activates relay, a timer relay, a timer switch, activates relay and is connected to frequency variator; Timer switch and switching circuit and the circuit that connects are in series with the circuit that activates relay and connect the timer relay, and the active circuit lotus root is connected to switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201701846U CN201318304Y (en) | 2008-12-11 | 2008-12-11 | Frequency conversion control device for air cooling blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201701846U CN201318304Y (en) | 2008-12-11 | 2008-12-11 | Frequency conversion control device for air cooling blower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201318304Y true CN201318304Y (en) | 2009-09-30 |
Family
ID=41197069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201701846U Expired - Fee Related CN201318304Y (en) | 2008-12-11 | 2008-12-11 | Frequency conversion control device for air cooling blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201318304Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006761A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of frequency conversion range hood and its method for controlling frequency conversion |
| CN110985431A (en) * | 2019-12-30 | 2020-04-10 | 中国建材国际工程集团有限公司 | Control circuit based on frequency converter communication control fan |
-
2008
- 2008-12-11 CN CNU2008201701846U patent/CN201318304Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108006761A (en) * | 2017-06-30 | 2018-05-08 | 宁波方太厨具有限公司 | A kind of frequency conversion range hood and its method for controlling frequency conversion |
| CN110985431A (en) * | 2019-12-30 | 2020-04-10 | 中国建材国际工程集团有限公司 | Control circuit based on frequency converter communication control fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090930 Termination date: 20141211 |
|
| EXPY | Termination of patent right or utility model |