CN113090544A - Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system - Google Patents
Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system Download PDFInfo
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- CN113090544A CN113090544A CN202110375046.1A CN202110375046A CN113090544A CN 113090544 A CN113090544 A CN 113090544A CN 202110375046 A CN202110375046 A CN 202110375046A CN 113090544 A CN113090544 A CN 113090544A
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- 238000001816 cooling Methods 0.000 title claims abstract description 50
- 230000005611 electricity Effects 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000000605 extraction Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 10
- 230000008676 import Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Classifications
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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
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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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
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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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
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
A steam-electricity double-drive water feeding pump system of a direct air cooling unit based on a double-fed system comprises an air cooling island, a steam-electricity double-drive water feeding pump, a double-fed motor and the like. The invention changes the pump feeding motor into the double-fed motor, the air inlet valve of the small engine is fully opened under each working condition, the throttling loss is reduced, the internal efficiency is improved, after the working power consumption of the pump feeding is met, the double-fed motor is automatically converted into a generator state, the residual power of the small engine is converted into electric energy, the power supply capacity of the unit is improved, the electric energy generated by the double-fed motor is 50Hz, and the network can be directly accessed; when the small motor fails or the output is insufficient, the double-fed motor is in a motor state, and the rotating speed of the pump can be directly adjusted. The speed regulation range of the double-fed motor is set according to the actual running accurate rotating speed range of the pump, so that the waste of allowance is avoided, and the manufacturing cost is low. Through the implementation of the steam-electricity double-drive water feeding pump system of the direct air cooling unit based on the double-feed system, all operation requirements of the water feeding pump can be met, the adjusting efficiency and the adjusting safety of the water feeding pump in the future high-frequency wide-load application scene are improved, and the energy-saving potential is huge.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a steam-electricity double-drive water supply pump system of a direct air cooling unit 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 direct 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 feed pump of the direct air cooling unit is high, and the direct air cooling unit is an important energy consumer in a power plant. At present, a boiler water feeding pump of a part of direct air cooling units adopts steam-electricity double-drive to reduce the plant power consumption rate and improve the generated energy of the units, the system of the driving mode is complex, the generated energy of a motor of the water feeding pump can be used on the internet only by rectifying and transforming 50HZ, and when the motor drives the water feeding pump, the motor does not have the speed regulation function and needs an additional hydraulic coupler or a frequency converter to cooperate with the speed regulation to adapt to the variable working condition operation of the units, and the system is complex in structure, poor in economical efficiency and poor in reliability. Therefore, the rationality of the driving mode and the speed regulating mode of the steam-electric double-drive boiler feed pump of the direct air cooling unit is very critical to the operation economy of the unit frequent regulation in the future high-frequency wide-load scene.
Disclosure of Invention
The invention aims to provide a steam-electricity double-drive water feeding pump system of a direct air cooling unit based on a double-feed system, which can meet the operation requirements of all working conditions of a steam-electricity double-drive water feeding pump, reduce the plant power consumption rate, improve the regulation efficiency and the regulation safety of the steam-electricity double-drive water feeding pump 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 double-drive water-feeding pump system of a direct air cooling unit based on a double-fed system comprises a steam turbine, a generator, an air cooling island, a small steam turbine, a steam-electricity double-drive water-feeding pump, a hydraulic coupler, a double-fed motor, a surface cooler and a small condensate pump;
the generator is coaxially connected with the steam turbine, one end of the double-fed motor is coaxially connected with the small steam turbine, and the other end of the double-fed motor is connected with the steam-electricity double-drive water-feeding pump through the hydraulic coupler;
the first steam extraction outlet of steam turbine is connected to the steam inlet of little steam turbine, and the steam extraction outlet of little steam turbine is connected to the import of surface cooler, and the exit linkage of surface cooler is to the import of little condensate pump, and the steam extraction outlet of steam turbine is connected to the import of air cooling island, and the export of little condensate pump and the export of air cooling island are connected to the boiler through vapour electricity double-drive feed water pump.
The invention further improves that the steam-electricity double-drive water feeding pump is based on double-feed system steam-electricity double-drive and is driven by a small steam turbine or a double-feed motor.
The invention is further improved in that a small turbine steam inlet is provided with a small turbine steam inlet regulating valve, and a small turbine steam exhaust regulating valve is arranged at a steam exhaust outlet.
The invention has the further improvement that under each working condition, the small turbine steam inlet regulating valve is fully opened, the throttling loss is reduced, the internal efficiency is improved, the double-fed motor is automatically converted into a generator state on the premise of meeting the working power consumption of the steam-electricity double-drive water-feeding pump, the residual power of the small 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, the transformation is not needed, and the network can be directly accessed.
The invention is further improved in that a water inlet valve and a water outlet valve of the pump are respectively arranged at the inlet and the outlet of the steam-electricity double-drive water feeding pump.
The invention is further improved in that a steam inlet of the steam turbine is provided with a steam inlet regulating valve of the 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 steam-electricity double-drive water-feeding pump to adjust the rotating speed of the steam-electricity double-drive water-feeding pump.
The invention has the further improvement that when the small steam turbine fails and the double-fed motor is used as a motor to operate, the rotating speed of the steam-electricity double-drive water-feeding pump can be adjusted by changing the frequency, so that the operating condition of the steam-electricity double-drive water-feeding pump 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 steam-electricity double-drive feed water pump when the double-feeder motor operates in a state.
The invention is further improved in that the steam of the steam turbine is discharged to the air cooling island for cooling and condensation;
and the exhaust steam of the small steam turbine is discharged into a surface cooler for cooling and condensation, and the condensed water is conveyed by a small condensed water pump, is converged with the condensed water of the air cooling island, is boosted by a steam-electricity double-drive water-feeding pump and then is sent to a boiler for heating.
Compared with the prior art, the double-fed motor changes a pump feeding motor into a double-fed motor, the small motor air inlet valve is fully opened under various working conditions, the throttling loss is reduced, the internal efficiency is improved, after the working power consumption of the pump feeding is met, the double-fed motor is automatically converted into a generator state, the residual power of the small motor is converted into electric energy, 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 motor fails or the output is insufficient, the double-fed motor is in a motor state, and the rotating speed of the pump can be directly adjusted. The speed regulation range of the double-fed motor is set according to the actual running accurate rotating speed range of the pump, so that the waste of allowance is avoided, and the manufacturing cost is low. The invention has the beneficial effects that:
(1) the driving and speed regulating system of the steam-electricity double-drive boiler feed pump of the existing direct air cooling unit can be simplified, and the power generated by the double-fed generator can be directly connected to the Internet without voltage transformation or rectification; the double-feed motor can directly adjust the rotating speed of the steam-electricity double-drive water-feeding pump of the direct air cooling unit, a hydraulic coupler or a variable-frequency adjusting system is omitted, and the operation is simple.
(2) The non-frequency-conversion simple fine continuous speed regulation of the steam-electricity double-drive feed pump of the direct air cooling unit in the electric operation state can be realized, and the regulation efficiency is high.
(3) The double-fed system has small floor area, low cost and high reliability
(4) The system is flexible in operation, simple in operation and strong in usability.
Drawings
FIG. 1 is a schematic diagram of a steam-electricity double-drive feed pump system of a direct air cooling unit based on a double-fed system.
Description of reference numerals:
1. the system comprises a steam turbine, 2, a generator, 3, an air cooling island, 4, a small turbine steam inlet regulating valve, 5, a small steam turbine, 6, a small turbine steam outlet regulating valve, 7, a water supply and discharge valve, 8, a steam-electricity double-drive water supply pump, 9, a pump water inlet valve, 10, a hydraulic coupler, 11, a double-fed motor, 12, a steam turbine steam inlet regulating valve, 13, a surface cooler, 14 and a small condensate pump.
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 double-drive water-feeding pump system of the direct air cooling unit based on the double-fed system provided by the invention comprises a steam turbine 1, a generator 2, an air cooling island 3, a small steam turbine 5, a steam-electricity double-drive water-feeding pump 8, a hydraulic coupler 10, a double-fed motor 11, a surface cooler 13 and a small condensate pump 14; the generator 2 is coaxially connected with the steam turbine 1, one end of a double-fed motor 11 is coaxially connected with the small steam turbine 5, and the other end of the double-fed motor is connected with a steam-electricity double-drive feed pump 8 through a hydraulic coupler 10; the first extraction steam outlet of the steam turbine 1 is connected to the steam inlet of the small steam turbine 5, the exhaust steam outlet of the small steam turbine 5 is connected to the inlet of the surface cooler 13, the outlet of the surface cooler 13 is connected to the inlet of the small condensate pump 14, the exhaust steam outlet of the steam turbine 1 is connected to the inlet of the air cooling island 3, and the outlet of the small condensate pump 14 and the outlet of the air cooling island 3 are connected to the boiler through the steam-electricity double-drive water feed pump 8.
Wherein, a small turbine steam inlet adjusting valve 4 is arranged at the steam inlet of the small turbine 5, and a small turbine steam exhaust adjusting valve 6 is arranged at the steam exhaust outlet. The inlet and outlet of the steam-electricity double-drive water feeding pump 8 are respectively provided with a water feeding valve 9 and a water discharging valve 7. A steam inlet of the steam turbine 1 is provided with a steam turbine inlet throttle valve 12.
Working example 1
In a certain direct air cooling unit provided with the steam-electricity double-drive water feeding pump, under the normal condition, the steam-electricity double-drive water feeding pump is driven by a small steam turbine, under the condition that the operation requirement of the steam-electricity double-drive water feeding pump is met, a motor automatically turns into a generator to operate, the generated electric energy needs rectification and transformation and then is merged into a unit service system, and the system is complex. When the small steam turbine fails, the steam-electricity double-drive water feeding pump is driven by the motor, and the rotating speed of the steam-electricity double-drive water feeding pump is adjusted through the hydraulic coupler or the frequency converter.
The existing pump feeding motor is changed into a double-fed motor, the air inlet valve of the small motor is fully opened under each working condition, the throttling loss is reduced, the internal efficiency is improved, after the working power consumption of the pump feeding is met, the double-fed motor is automatically converted into a generator state, the residual power of the small motor is converted into electric energy, the power supply capacity of a unit is improved, the electric energy generated by the double-fed motor is 50Hz, and the network can be directly accessed; when the small motor fails or the output is insufficient, the double-fed motor is in a motor state, and the rotating speed of the pump can be directly adjusted. The speed regulation range of the double-fed motor is set according to the actual running accurate rotating speed range of the pump, so that the waste of allowance is avoided, and the manufacturing cost is low. The direct air cooling unit steam-electricity double-drive water pump system based on the double-feed system is flexible in operation, simple in operation, strong in availability and high in reliability.
The operating mode of the direct air cooling unit steam-electricity double-drive water pump system based on the double-fed system.
1. When the small steam turbine 5 has a reliable steam source, the steam-electricity double-drive water feeding pump 8 is driven by the small steam turbine 5, and the small steam inlet regulating valve 4 is fully opened, so that the steam inlet throttling loss is reduced, and the internal efficiency of the small steam turbine 5 is improved. On the premise of meeting the working power consumption of the steam-electricity double-drive water feeding pump 8, the double-fed motor 11 is automatically converted into a generator state, the residual power of the small steam turbine 5 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 11 is 50HZ, and the direct internet surfing can be realized.
2. When the small steam turbine 5 has no reliable steam source, the double-fed motor 11 operates as a motor, the steam-electricity double-drive water-feeding pump 8 is driven by the double-fed motor, and the double-fed motor can directly adjust the rotating speed of the steam-electricity double-drive water-feeding pump 8 and adjust the operating condition of the steam-electricity double-drive water-feeding pump 8.
Through the implementation of the steam-electricity double-drive water-feeding pump system of the direct air cooling unit based on the double-feed system, all operation requirements of the steam-electricity double-drive water-feeding pump can be met, the adjusting efficiency and the adjusting safety of the steam-electricity double-drive water-feeding pump in the future high-frequency wide-load application scene are improved, and the energy-saving potential is huge.
Claims (10)
1. A steam-electricity double-drive water pump system of a direct air cooling unit based on a double-fed system is characterized by comprising a steam turbine (1), a generator (2), an air cooling island (3), a small steam turbine (5), a steam-electricity double-drive water pump (8), a hydraulic coupler (10), a double-fed motor (11), a surface cooler (13) and a small condensate pump (14);
the generator (2) is coaxially connected with the steam turbine (1), one end of the double-fed motor (11) is coaxially connected with the small steam turbine (5), and the other end of the double-fed motor is connected with the steam-electricity double-drive water feeding pump (8) through a hydraulic coupler (10);
a first steam extraction outlet of the steam turbine (1) is connected to a steam inlet of the small steam turbine (5), a steam exhaust outlet of the small steam turbine (5) is connected to an inlet of the surface cooler (13), an outlet of the surface cooler (13) is connected to an inlet of the small condensate pump (14), a steam exhaust outlet of the steam turbine (1) is connected to an inlet of the air cooling island (3), and an outlet of the small condensate pump (14) and an outlet of the air cooling island (3) are connected to a boiler through the steam-electricity double-drive feed water pump (8).
2. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system according to claim 1, characterized in that the steam-electricity double-drive water pump (8) is a steam-electricity double-drive based on the double-fed system, and is driven by a small steam turbine (5) or a double-fed motor (11).
3. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system according to claim 1, characterized in that a small turbine steam inlet adjusting valve (4) is arranged at a steam inlet of the small turbine (5), and a small turbine steam outlet adjusting valve (6) is arranged at a steam outlet.
4. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system according to claim 2, characterized in that under each working condition, the steam inlet throttle (4) of the small turbine is fully opened, so that the throttling loss is reduced, the internal efficiency is improved, on the premise of meeting the working power consumption of the steam-electricity double-drive water pump (8), the double-fed motor (11) is automatically converted into a generator state, the residual power of the small turbine (5) 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, the transformation is not needed, and the direct internet surfing can be realized.
5. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system as claimed in claim 1, wherein the inlet and outlet of the steam-electricity double-drive water pump (8) are respectively provided with a water inlet valve (9) and a water outlet valve (7) for the pump.
6. The steam-electricity double-drive water pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein a steam turbine inlet throttle (12) is arranged at a steam inlet of the steam turbine (1).
7. The steam-electric double-drive water pump system of the direct air cooling unit based on the double-fed system as claimed in claim 1, wherein the double-fed motor (11) 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 steam-electric double-drive water pump (8) to adjust the rotating speed of the steam-electric double-drive water pump (8).
8. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system according to claim 1, characterized in that when the small steam turbine (5) fails and the double-fed motor (11) operates as a motor, the frequency can be changed to adjust the rotating speed of the steam-electricity double-drive water pump (8), so as to adjust the operation condition of the steam-electricity double-drive water pump (8).
9. The steam-electric double-drive water pump system of the direct air cooling unit based on the double-fed system as claimed in claim 1, wherein when the double-fed motor (11) 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 steam-electric double-drive water pump (8).
10. The steam-electricity double-drive water pump system of the direct air cooling unit based on the double-fed system according to the claim 1, characterized in that the steam discharged from the steam turbine (1) is cooled and condensed in the air cooling island (3);
the exhaust steam of the small steam turbine (5) is discharged into a surface cooler (13) for cooling and condensation, and condensed water is conveyed by a small condensed water pump (14), is merged with the condensed water of the air cooling island (3), is subjected to pressure boosting by a steam-electricity double-drive water feeding pump (8), and is then sent to a boiler for heating.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375046.1A CN113090544A (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110375046.1A CN113090544A (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system |
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| CN113090544A true CN113090544A (en) | 2021-07-09 |
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| CN202110375046.1A Pending CN113090544A (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit vapour electricity double-drive feed pump system based on double-fed system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114483552A (en) * | 2022-02-18 | 2022-05-13 | 重庆江增船舶重工有限公司 | Control method for steam-electricity double-drive water pump system |
| CN114837761A (en) * | 2022-05-06 | 2022-08-02 | 西安热工研究院有限公司 | Frequency conversion system for improving internet power and working method |
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Cited By (2)
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| CN114483552A (en) * | 2022-02-18 | 2022-05-13 | 重庆江增船舶重工有限公司 | Control method for steam-electricity double-drive water pump system |
| CN114837761A (en) * | 2022-05-06 | 2022-08-02 | 西安热工研究院有限公司 | Frequency conversion system for improving internet power and working method |
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Application publication date: 20210709 |