CN112983876A - Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system - Google Patents
Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system Download PDFInfo
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- CN112983876A CN112983876A CN202110375044.2A CN202110375044A CN112983876A CN 112983876 A CN112983876 A CN 112983876A CN 202110375044 A CN202110375044 A CN 202110375044A CN 112983876 A CN112983876 A CN 112983876A
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- 238000001816 cooling Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 14
- 239000010959 steel Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
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- 238000010977 unit operation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/08—Adaptations for driving, or combinations with, pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
- F04D25/045—Units comprising pumps and their driving means the pump being fluid-driven the pump wheel carrying the fluid driving means, e.g. turbine blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
A steam-electricity double-drive system of an indirect air cooling unit induced draft fan based on a double-fed system comprises a double-fed motor, a small steam turbine, a steel structure indirect air cooling tower and the like. The invention relates to a steam-electricity double-drive induced draft fan motor which is changed into a double-fed motor, wherein under various working conditions, the inlet valve of a small steam turbine is fully opened, so that the throttling loss is reduced, and the internal efficiency is improved. 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 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 has a fault, the double-fed motor operates as a motor, and the rotating speed and the operating condition of the induced draft fan can be directly adjusted. Through the implementation of a steam-electricity double-drive system of the indirect air cooling unit induced draft fan based on the double-feed system, the requirements of all operation states of the induced draft fan can be met, the production flow is simplified, the operation safety and economy of the unit are improved, and the application prospect is deep under the future high-frequency wide-load scene.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a steam-electricity dual-drive system of an indirect air cooling unit induced draft fan based on a double-feed 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 indirect air cooling system has become one of the mainstream techniques for cooling the exhaust steam of the steam turbine of the thermal power generating unit in northern China in recent years due to the advantages of excellent water-saving performance, flexible system adjustment and the like. 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.
Disclosure of Invention
The invention aims to provide a steam-electricity dual-drive system of an induced draft fan of an indirect air cooling unit based on a double-feed system, which can meet the operation requirements of all working conditions of the induced draft fan, simplify the production flow, improve the regulation efficiency and the regulation safety of the induced draft fan in the future high-frequency wide-load application scene and have huge energy-saving potential.
In order to achieve the purpose, the invention adopts the technical scheme that:
a steam-electricity dual-drive system of an induced draft fan of an indirect air cooling unit based on a double-fed system comprises a steam turbine low-pressure cylinder, a condenser, a steel structure indirect air cooling tower, a circulating water pump, a hot well, a double-fed motor, the induced draft fan, a small steam turbine, a small condenser and a small condensate pump;
the exhaust steam outlet of the steam turbine low pressure cylinder is connected to the steam inlet of the condenser, and the steam is cooled and condensed in the condenser and collected in the hot well;
the double-fed motor and the small steam turbine are respectively and coaxially connected with the induced draft fan, the steam exhaust outlet of the small steam turbine is connected to the steam inlet of the small condenser, the small condenser is provided with a circulating water inlet and a circulating water outlet, the condensed water outlet of the small condenser is connected to the inlet of the hot well through a small condensed water pump, and the outlet of the hot well is connected to the heat regenerative system;
the circulating water outlet of the steel structure indirect air cooling tower is connected to the circulating water inlet of the condenser, and the circulating water outlet of the condenser is connected to the circulating water inlet of the steel structure indirect air cooling tower through the circulating water pump.
The invention has the further improvement that a circulating water inlet and a circulating water outlet of the condenser are respectively provided with a circulating water inlet door of the condenser and a circulating water outlet door of the condenser.
The invention is further improved in that the inlet and the outlet of the circulating water pump are respectively provided with a circulating pump inlet door and a circulating pump outlet door.
The invention has the further improvement that an indirect cooling tower inlet door and an indirect cooling tower outlet door are respectively arranged at the circulating water inlet and the circulating water outlet of the steel structure indirect air cooling tower.
The invention is further improved in that the inlet and the outlet of the small condensate pump are respectively provided with a small condensate pump inlet door and a small condensate pump outlet door.
The invention is further improved in that the induced draft fan is driven by a double-fed motor or a small steam turbine.
The invention has the further improvement that the double-fed motor can run in a generator state and output electric energy with constant power frequency of 50HZ, or run in a motor state, and adjust the frequency of output current according to the running state of the induced draft fan and adjust the rotating speed of the induced draft fan.
The invention has the further improvement that 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 the unit is improved, and the electric energy generated by the double-fed motor is 50HZ and can be directly accessed to the Internet.
The invention has the further improvement that when the small steam turbine fails and the double-fed motor is used as a motor, the rotating speed of the induced draft fan can be adjusted by changing the frequency, so that the operation condition of the induced draft fan is adjusted.
The invention is further improved in that the speed regulation range of the double-feeder motor is set according to the accurate rotating speed range required by the actual operation of the induced draft fan when the double-feeder motor operates in a state.
Compared with the prior art, the invention changes the motor of the steam-electricity double-drive induced draft fan of the indirect air cooling unit into a double-fed motor, and sets the adjusting range of the double-fed motor 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 invention has the beneficial effects that:
(1) the existing steam-electricity double-drive system can be simplified, and the generated energy of the double-fed generator can be directly connected to the internet without voltage transformation or rectification; the double-fed motor can directly adjust the rotating speed of the induced draft fan, a movable blade adjusting system is omitted, and the operation is simple.
(2) The non-frequency-conversion simple fine continuous speed regulation of the indirect air cooling unit induced draft fan can be realized, and the regulation efficiency is higher than that of movable blade regulation.
(3) Compare in the movable blade regulation of draught fan self, this double-fed system's area is very little, and the cost is low, and the reliability is high.
Drawings
Fig. 1 is a schematic diagram of a steam-electricity dual-drive system of an induced draft fan of an indirect air cooling unit based on a double-fed system.
Description of reference numerals:
1. steam turbine low pressure jar, 2, the condenser, 3, condenser circulating water inlet door, 4, condenser circulating water outlet door, 5, the indirect air cooling tower of steel construction, 6, the circulation pump inlet door, 7, circulating water pump, 8, the circulation pump outlet door, 9, intercooling tower outlet door, 10, intercooling tower inlet door, 11, the heat well, 12, double-fed motor, 13, the draught fan, 14, little steam turbine, 15, little condenser, 16, little condensate pump inlet door, 17, little condensate pump, 18, little condensate pump outlet door.
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 described herein are merely for purposes of illustration and explanation and are not intended to limit the present invention.
As shown in fig. 1, the steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the double-fed system, provided by the invention, comprises a steam turbine low-pressure cylinder 1, a condenser 2, a steel structure indirect air cooling tower 5, a circulating water pump 7, a hot well 11, a double-fed motor 12, an induced draft fan 13, a small steam turbine 14, a small condenser 15 and a small condensate pump 17; an exhaust steam outlet of the steam turbine low-pressure cylinder 1 is connected to a steam inlet of a condenser 2, and steam is cooled and condensed in the condenser 2 and collected in a hot well 11; the double-fed motor 12 and the small steam turbine 14 are respectively and coaxially connected with the induced draft fan 13, the exhaust outlet of the small steam turbine 14 is connected to the steam inlet of the small condenser 15, the small condenser 15 is provided with a circulating water inlet and a circulating water outlet, the condensed water outlet of the small condenser 15 is connected to the inlet of the hot well 11 through the small condensed water pump 17, and the outlet of the hot well 11 is connected to the heat recovery system; the circulating water outlet of the steel structure indirect air 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 steel structure indirect air cooling tower 5 through the circulating water pump 7.
Wherein, condenser circulating water inlet door 3 and condenser circulating water outlet door 4 are provided with respectively at condenser 2's circulating water inlet and outlet department. 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. An indirect cooling tower inlet door 10 and an indirect cooling tower outlet door 9 are respectively arranged at the circulating water inlet and outlet of the steel structure indirect air cooling tower 5.
Working example 1
In an indirect air cooling unit provided with a steam-electricity double-drive induced draft fan, the induced draft fan adjusts the flow by the movable blades under normal conditions, and the induced draft fan cannot adjust the flow if the movable blades fail. When the motor operates in a generator state, the generated electric energy needs to be rectified and transformed and then is merged into a plant service system of the unit, and the system is complex. The steam-electricity double-drive system of the indirect air cooling unit induced draft fan is modified, a motor is replaced by a double-fed motor, when a small steam turbine fails, the rotating speed of the induced draft fan can be adjusted by changing the frequency when the double-fed motor is used as a motor, so that the operating condition of the induced draft fan is adjusted, the speed adjusting range of the double-fed motor is set according to the accurate rotating speed range required by the actual operation of the induced draft fan when the double-fed motor operates in a motor state, and is not 0-100%, and the waste of rotating speed allowance is avoided. When the unit operates at each load, the steam inlet regulating valve of the induced draft fan steam turbine is fully opened, thus reducing the steam inlet throttling loss and improving the internal efficiency of the small steam turbine. 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 the unit is improved, the electric energy generated by the double-fed motor is 50HZ, transformation rectification is not needed, and the network can be directly accessed.
Through the implementation of a steam-electricity double-drive system of the indirect air cooling unit induced draft fan based on the double-feed system, the requirements of all operation states of the induced draft fan can be met, the production flow is simplified, the operation safety and economy of the unit are improved, and the application prospect is deep under the future high-frequency wide-load scene.
Claims (10)
1. A steam-electricity dual-drive system of an indirect air cooling unit induced draft fan based on a double-fed system is characterized by comprising a steam turbine low pressure cylinder (1), a condenser (2), a steel structure indirect air cooling tower (5), a circulating water pump (7), a hot well (11), a double-fed motor (12), an induced draft fan (13), a small steam turbine (14), a small condenser (15) and a small condensate pump (17);
an exhaust steam outlet of the steam turbine low-pressure cylinder (1) is connected to a steam inlet of the condenser (2), and steam is cooled and condensed in the condenser (2) and collected in the hot well (11);
the double-fed motor (12) and the small steam turbine (14) are respectively and coaxially connected with the induced draft fan (13), an exhaust outlet of the small steam turbine (14) is connected to a steam inlet of the small condenser (15), a circulating water inlet and a circulating water outlet are formed in the small condenser (15), condensed water of the small condenser (15) is connected to an inlet of the hot well (11) through the small condensed water pump (17), and an outlet of the hot well (11) is connected to a heat return system;
the circulating water outlet of the steel structure indirect air 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 steel structure indirect air cooling tower (5) through the circulating water pump (7).
2. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the doubly-fed system as claimed in claim 1, wherein a condenser circulating water inlet door (3) and a condenser circulating water outlet door (4) are respectively arranged at a circulating water inlet and outlet of the condenser (2).
3. The steam-electric double-drive system of the induced draft fan of the indirect air cooling unit based on the doubly-fed system as claimed in claim 1, wherein 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).
4. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the double-fed system as claimed in claim 1, wherein an indirect cooling tower inlet door (10) and an indirect cooling tower outlet door (9) are respectively arranged at a circulating water inlet and outlet of the steel structure indirect air cooling tower (5).
5. The steam-electric double-drive system of the induced draft fan of the indirect air cooling unit based on the double-fed system as claimed in claim 1, wherein an inlet and an outlet of the small condensate pump (17) are respectively provided with an inlet door (16) and an outlet door (18) of the small condensate pump.
6. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the induced draft fan (13) is driven by a doubly-fed motor (12) or a small steam turbine (14).
7. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the double-fed system as claimed in 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 to adjust the rotating speed of the induced draft fan.
8. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the double-fed system as claimed in claim 1, characterized in that on the premise of meeting the working power consumption of the induced draft fan (13), the double-fed motor (12) is automatically converted into a generator state, the residual power of the small steam turbine is converted into electric energy and is incorporated into a plant power system, the power supply capacity of the unit is improved, the electric energy generated by the double-fed motor is 50HZ, and the direct internet surfing can be realized.
9. The steam-electricity dual-drive system of the induced draft fan of the indirect air cooling unit based on the doubly-fed system as claimed in claim 1, wherein when the small steam turbine (14) fails and the doubly-fed motor (12) operates as a motor, the rotating speed of the induced draft fan (13) can be adjusted by changing the frequency, so that the operating condition of the induced draft fan (13) can be adjusted.
10. The steam-electric double-drive system of the induced draft fan of the indirect air cooling unit based on the doubly-fed system as claimed in claim 1, wherein when the motor of the doubly-fed motor (12) is in a state of operation, the speed regulation range is set according to the accurate rotating speed range required by the actual operation of the induced draft fan (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375044.2A CN112983876A (en) | 2021-04-08 | 2021-04-08 | Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375044.2A CN112983876A (en) | 2021-04-08 | 2021-04-08 | Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system |
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| CN112983876A true CN112983876A (en) | 2021-06-18 |
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| CN202110375044.2A Pending CN112983876A (en) | 2021-04-08 | 2021-04-08 | Steam-electricity double-drive system of indirect air cooling unit induced draft fan based on double-feed system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114183211A (en) * | 2021-10-27 | 2022-03-15 | 华能汕头海门发电有限责任公司 | Method for transforming condensate system of induced draft fan and quickly judging condenser leakage |
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2021
- 2021-04-08 CN CN202110375044.2A patent/CN112983876A/en active Pending
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| CN107100853A (en) * | 2017-07-04 | 2017-08-29 | 山西漳电大唐塔山发电有限公司 | A kind of auxiliary power system for two-shipper backheat |
| CN110159559A (en) * | 2019-05-09 | 2019-08-23 | 国家能源集团宿迁发电有限公司 | A kind of vapour electricity is double to drive draught fan system and its progress control method |
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| CN114183211A (en) * | 2021-10-27 | 2022-03-15 | 华能汕头海门发电有限责任公司 | Method for transforming condensate system of induced draft fan and quickly judging condenser leakage |
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Application publication date: 20210618 |