CN215058275U - Double-fed system-based electric induced draft fan system of wet cooling unit - Google Patents
Double-fed system-based electric induced draft fan system of wet cooling unit Download PDFInfo
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- CN215058275U CN215058275U CN202120706950.1U CN202120706950U CN215058275U CN 215058275 U CN215058275 U CN 215058275U CN 202120706950 U CN202120706950 U CN 202120706950U CN 215058275 U CN215058275 U CN 215058275U
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Abstract
The utility model discloses a wet cooling unit electric draught fan system based on double-fed system, including steam turbine, double-fed motor, little steam turbine, natural draft cooling tower etc. The utility model changes the electric draught fan into steam-electricity double-drive, and adds the draught fan to drive the small steam turbine; and the motor is changed into a double-fed motor. On the premise of meeting the working power consumption of the induced draft fan, the double-fed motor is automatically converted into a generator state, the residual power of the small steam turbine is converted into electric energy and is merged into a plant power system, the power supply capacity of a unit is improved, and the electric energy generated by the double-fed motor can be directly on the internet; when the small steam turbine is in fault and the double-fed motor is used as a motor to operate, the rotating speed of the induced draft fan can be directly adjusted, so that the operating condition of the induced draft fan is adjusted. Through the implementation of the double-fed system-based wet cooling unit electric induced draft fan system, the requirements of all running states of the induced draft fan can be met, the plant power consumption rate is reduced, the adjusting efficiency and the adjusting safety of the induced draft fan under the future high-frequency wide-load application scene are improved, and the double-fed system-based wet cooling unit electric induced draft fan system has huge energy-saving potential.
Description
Technical Field
The utility model belongs to power plant boiler and steam turbine system field, concretely relates to wet cooling unit electric draught fan system based on double-fed system.
Background
In recent years, the installed capacity of new energy electric power such as wind power, photovoltaic and hydropower in China is continuously and rapidly increased, and the installed capacity in service and under construction is the first in the world. New energy sources such as wind power and photovoltaic power provide a large amount of clean power for people, but on the other hand, the randomness and instability of generated output of the new energy sources also bring great challenges to the safe operation and power supply guarantee of a power system. From the current situation, the adjustment capability of the power system in China is difficult to completely adapt to the requirement of large-scale development and consumption of new energy, and the problems of wind abandonment, light abandonment and water abandonment are severe in some areas. In order to excavate the peak regulation potential of a thermal power generating unit, improve the thermal power operation flexibility of China and improve the new energy consumption capacity, the thermal power generating unit needs to operate under the working condition of wide-load and high-frequency load change, the power consumption rate of main auxiliary equipment of a power plant, such as a water pump, a fan and the like, is greatly improved, according to field test data, when the peak regulation of the unit is up to 30% of load, the power consumption rate of the plant is increased to about 10%, and the power supply efficiency is obviously reduced.
The driving power of the boiler induced draft fan is high, and the boiler induced draft fan is a main electric energy consumer in a power plant. The electric power of the two induced draft fans accounts for about 1.48% of the total power generation amount of the unit, and the power consumption of the induced draft fans in the power plant accounts for about 30% of the service power, so the rationality of the driving mode and the speed regulation mode of the induced draft fans is very critical to the economy of unit operation in future high-frequency wide-load scenes.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a wet cooling unit electric draught fan system based on double-fed system can satisfy the operation demand of all operating modes of draught fan, simplifies the production flow, improves the draught fan and uses the security of regulation efficiency and regulation under the scene in future high frequency wide load, has huge energy-conserving potentiality.
In order to achieve the above purpose, the utility model discloses a technical scheme is:
a double-fed system-based electric induced draft fan system of a wet cooling unit comprises a steam turbine, a condenser, a natural draft cooling tower, a circulating water pump, a double-fed motor, a small steam turbine and an induced draft fan;
the double-fed motor and the small steam turbine are respectively and coaxially connected with the induced draft fan, a first steam extraction outlet of the steam turbine is connected to a steam inlet of the small steam turbine, a steam exhaust outlet of the small steam turbine and a steam exhaust outlet of the steam turbine are connected to a steam inlet of the condenser, steam is condensed into condensed water in the condenser and then collected in the hot well, and an outlet of the hot well is connected to a heat regenerative system;
and a circulating water outlet of the natural ventilation cooling tower is connected to a circulating water inlet of the condenser, and a circulating water outlet of the condenser is connected to a circulating water inlet of the natural ventilation cooling tower through a circulating water pump.
The utility model discloses further improvement lies in, condenser's recirculated cooling water inlet and outlet department is provided with condenser circulating water import door and condenser circulating water outlet door respectively.
The utility model discloses further improvement lies in, circulating water pump's entry and exit department is provided with respectively along pump inlet door and along pump outlet door.
The utility model discloses further improvement lies in, and the draught fan adopts double-fed motor drive, perhaps adopts little turbine drive, and the steam condenser is gone into to the steam extraction of little turbine.
The utility model discloses further improvement lies in, and double-fed motor can be in the generator state operation to export the electric energy of the invariable power frequency 50HZ, perhaps in the motor state operation, and adjust the rotational speed of draught fan according to the running state adjustment output current's of draught fan frequency.
The utility model discloses further improvement lies in, satisfying under the prerequisite of draught fan working power consumption, double-fed motor is automatic to be changed into the generator state, converts little steam turbine residual power into the electric energy and incorporate the station service power system, improves unit power supply ability, and double-fed motor generated energy is 50HZ, need not the vary voltage, can directly surf the net.
The utility model discloses further improvement lies in, when little steam turbine trouble, when the motor operation is done to the double-fed motor, can change the frequency and adjust the draught fan rotational speed to adjust draught fan operating mode.
The utility model discloses further improvement lies in, when the double feed motor state was moved, its speed governing scope was set up according to the accurate rotational speed scope of the actual motion needs of draught fan.
The utility model discloses further improvement lies in, the circulating water is through cooling down with the direct heat transfer of natural wind in the natural draft cooling tower.
Compared with the prior art, the utility model changes the electric draught fan of the wet cooling unit into steam-electricity double-drive, and adds the draught fan to drive the small steam turbine; and the motor is changed into a double-fed motor, and the adjusting range of the double-fed motor is set according to the accurate rotating speed range of the actual operation of the induced draft fan. On the premise of meeting the working power consumption of the induced draft fan, the double-fed motor is automatically converted into a generator state, the residual power of the small steam turbine is converted into electric energy and is merged into a plant power system, the power supply capacity of a unit is improved, the electric energy generated by the double-fed motor is 50HZ, and the direct internet surfing can be realized; when the small steam turbine is in fault and the double-fed motor is used as a motor to operate, the rotating speed of the induced draft fan can be adjusted by changing the frequency, so that the operating condition of the induced draft fan is adjusted. The beneficial effects of the utility model reside in that:
(1) the method can meet all running states of the induced draft fan, improves the regulation efficiency and the regulation safety of the induced draft fan in future high-frequency wide-load application scenes, and has huge energy-saving potential.
(2) The power generated by the doubly-fed generator can be directly connected to the Internet without voltage transformation or rectification; when the double-fed motor is driven, the double-fed motor can directly adjust the rotating speed of the draught fan, the simple fine continuous speed regulation of the non-variable frequency of the draught fan of the wet cooling unit can be realized, a movable blade adjusting system or a variable frequency adjusting system is omitted, and the adjusting efficiency is high.
(3) When the steam turbine is driven, the auxiliary power can be reduced, the power supply quantity of the unit is increased, and the business income of the power plant is increased.
(4) Compare in the movable blade regulation or the frequency conversion regulation of draught fan self, this double-fed system's area is very little, and the cost is low, and the reliability is high.
(5) The system is flexible in operation, simple in operation, strong in availability and high in reliability.
Drawings
Fig. 1 is the utility model discloses a wet cooling unit electric draught fan system schematic based on double-fed system.
Description of reference numerals:
1. the system comprises a steam turbine, 2, a condenser, 3, a condenser circulating water inlet door, 4, a condenser circulating water outlet door, 5, a natural ventilation cooling tower, 6, a circulating pump inlet door, 7, a circulating water pump, 8, a circulating pump outlet door, 9, a hot well, 10, a small steam turbine, 11, an induced draft fan, 12 and a double-fed motor.
Detailed Description
The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the preferred embodiments are described herein for purposes of illustration and explanation, and not limitation.
As shown in fig. 1, the utility model provides a wet cooling unit electric induced draft fan system based on double-fed system, which comprises a steam turbine 1, a condenser 2, a natural draft cooling tower 5, a circulating water pump 7, a double-fed motor 12, a small steam turbine 10 and an induced draft fan 11; the double-fed motor 12 and the small steam turbine 10 are respectively and coaxially connected with the induced draft fan 11, the outlet of a first steam extraction port of the steam turbine 1 is connected to the steam inlet of the small steam turbine 10, the steam exhaust outlet of the small steam turbine 10 and the steam exhaust outlet of the steam turbine 1 are connected to the steam inlet of the condenser 2, the exhaust steam is cooled and condensed in the condenser 2 and is collected in the hot well 9, and the outlet of the hot well 9 is connected to a heat return system; a circulating water outlet of the natural ventilation cooling tower 5 is connected to a circulating water inlet of the condenser 2, and a circulating water outlet of the condenser 2 is connected to a circulating water inlet of the natural ventilation cooling tower 5 through a circulating water pump 7.
Wherein, steam inlet and outlet department of condenser 2 is provided with condenser circulating water inlet door 3 and condenser circulating water outlet door 4 respectively. The inlet and outlet of the circulating water pump 7 are respectively provided with a circulating pump inlet door 6 and a circulating pump outlet door 8. The induced draft fan 11 is driven by a double-fed motor 12 or a small steam turbine 10, and exhaust steam of the small steam turbine 10 is discharged into the condenser 2.
Working example 1
In a certain wet cooling unit provided with an electric induced draft fan, the induced draft fan is driven by a motor, the plant power consumption rate is particularly high, and the economic parameters of the unit are seriously influenced. An electric induced draft fan is changed into a steam-electricity dual-drive mode, the induced draft fan is additionally arranged to drive a small turbine, and the exhaust steam of the small turbine is discharged into a condenser of a large turbine; and the motor is changed into a double-fed motor, and the adjusting range of the double-fed motor is set according to the accurate rotating speed range of the actual operation of the induced draft fan. On the premise of meeting the working power consumption of the induced draft fan, the double-fed motor is automatically converted into a generator state, the residual power of the small steam turbine is converted into electric energy and is merged into a plant power system, the power supply capacity of a unit is improved, the electric energy generated by the double-fed motor is 50Hz, and the direct internet surfing can be realized; when the small steam turbine is in fault and the double-fed motor is used as a motor to operate, the rotating speed of the induced draft fan can be adjusted by changing the frequency, so that the operating condition of the induced draft fan is adjusted.
The double-fed system-based electric induced draft fan system of the wet cooling unit is flexible in operation, simple in operation, strong in usability and high in reliability.
1. And when the wet cooling unit is started, the operation mode of the electric induced draft fan system of the wet cooling unit based on the double-fed system is adopted.
If a turbine-adjacent steam source exists in the small steam turbine, the small steam turbine is adopted to drive the induced draft fan, the double-fed motor is automatically converted into a generator state on the premise of meeting the working power consumption of the induced draft fan, the residual power of the small steam turbine is converted into electric energy and is incorporated into a plant power system, and the power supply capacity of a unit is improved; if the output power of the small steam turbine cannot meet the driving requirement of the induced draft fan, the double-fed motor is converted into a motor state, and the induced draft fan is driven together.
If the small steam turbine is not provided with a turbine steam source, the induced draft fan is driven by pure electric power, the double-fed motor is driven by the motor, and the rotating speed of the induced draft fan can be directly adjusted.
2. And when the wet cooling unit normally operates, the operation mode of the electric induced draft fan system of the wet cooling unit based on the double-fed system is adopted.
The small steam turbine is adopted to drive the induced draft fan, the double-fed motor is automatically converted into a generator state on the premise of meeting the working power consumption of the induced draft fan, the residual power of the small steam turbine is converted into electric energy and is merged into a plant power system, and the power supply capacity of a unit is improved; if the output power of the small steam turbine cannot meet the driving requirement of the induced draft fan, the double-fed motor is converted into a motor state to drive the induced draft fan together; if the small steam turbine has a fault, the induced draft fan is driven by pure electric power, the double-fed motor is driven by the motor at the moment, and the rotating speed of the induced draft fan can be directly adjusted.
Through the implementation of the double-fed system-based wet cooling unit electric induced draft fan system, all running states of the induced draft fan can be met, the plant power consumption rate is reduced, the adjusting efficiency and the adjusting safety of the induced draft fan under the future high-frequency wide-load application scene are improved, and the double-fed system-based wet cooling unit electric induced draft fan system has huge energy-saving potential.
Claims (9)
1. A double-fed system-based electric induced draft fan system of a wet cooling unit is characterized by comprising a steam turbine (1), a condenser (2), a natural draft cooling tower (5), a circulating water pump (7), a double-fed motor (12), a small steam turbine (10) and an induced draft fan (11);
the double-fed motor (12) and the small steam turbine (10) are respectively and coaxially connected with the induced draft fan (11), a first steam extraction outlet of the steam turbine (1) is connected to a steam inlet of the small steam turbine (10), a steam exhaust outlet of the small steam turbine (10) and a steam exhaust outlet of the steam turbine (1) are connected to a steam inlet of the condenser (2), steam is condensed into condensed water in the condenser (2) and then collected in the hot well (9), and an outlet of the hot well (9) is connected to a heat recovery system;
the circulating water outlet of the natural ventilation cooling tower (5) is connected to the circulating water inlet of the condenser (2), and the circulating water outlet of the condenser (2) is connected to the circulating water inlet of the natural ventilation cooling tower (5) through the circulating water pump (7).
2. The doubly-fed system-based electric induced draft fan system of the wet cooling unit, according to claim 1, wherein a condenser circulating water inlet door (3) and a condenser circulating water outlet door (4) are respectively provided at a steam inlet and a steam outlet of the condenser (2).
3. The double-fed system-based electric induced draft fan system of the wet cooling unit, according to claim 1, wherein an inlet and an outlet of the circulating water pump (7) are respectively provided with a circulating pump inlet door (6) and a circulating pump outlet door (8).
4. An electric induced draft fan system of a wet cooling unit based on a double-fed system according to claim 1, characterized in that the induced draft fan (11) is driven by a double-fed motor (12) or by a small turbine (10), and the exhaust steam of the small turbine (10) is discharged into a condenser (2).
5. The double-fed system-based wet cooling unit electric induced draft fan system of claim 1, wherein the double-fed motor (12) can operate in a generator state and output electric energy with a constant power frequency of 50HZ, or operate in a motor state and adjust the frequency of output current according to the operating state of the induced draft fan (11) to adjust the rotating speed of the induced draft fan (11).
6. The double-fed system-based electric induced draft fan system of the wet cooling unit is characterized in that on the premise that the working power consumption of the induced draft fan (11) is met, the double-fed motor (12) is automatically converted into a generator state, the residual power of the small steam turbine (10) is converted into electric energy and is merged into a plant power system, the power supply capacity of the unit is improved, the electric energy generated by the double-fed motor (12) is 50HZ, transformation is not needed, and direct internet surfing can be achieved.
7. The double-fed system based wet cooling unit electric induced draft fan system of claim 1, wherein when the small steam turbine (10) is in failure and the double-fed motor (12) is operated as a motor, the rotating speed of the induced draft fan (11) can be adjusted by changing the frequency, so that the operation condition of the induced draft fan (11) can be adjusted.
8. The double-fed system-based wet cooling unit electric induced draft fan system of claim 1, wherein the speed regulation range of the double-fed motor (12) is set according to the accurate rotating speed range required by the actual operation of the induced draft fan (11) when the motor operates in a state.
9. The double-fed system-based wet cooling unit electric induced draft fan system of claim 1, wherein the circulating water is cooled in a natural draft cooling tower (5) by direct heat exchange with natural wind.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706950.1U CN215058275U (en) | 2021-04-08 | 2021-04-08 | Double-fed system-based electric induced draft fan system of wet cooling unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706950.1U CN215058275U (en) | 2021-04-08 | 2021-04-08 | Double-fed system-based electric induced draft fan system of wet cooling unit |
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| CN215058275U true CN215058275U (en) | 2021-12-07 |
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| CN202120706950.1U Active CN215058275U (en) | 2021-04-08 | 2021-04-08 | Double-fed system-based electric induced draft fan system of wet cooling unit |
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- 2021-04-08 CN CN202120706950.1U patent/CN215058275U/en active Active
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