CN215058220U - Direct air cooling unit boiler electric feed pump system based on double-fed system - Google Patents
Direct air cooling unit boiler electric feed pump system based on double-fed system Download PDFInfo
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- CN215058220U CN215058220U CN202120707020.8U CN202120707020U CN215058220U CN 215058220 U CN215058220 U CN 215058220U CN 202120707020 U CN202120707020 U CN 202120707020U CN 215058220 U CN215058220 U CN 215058220U
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Abstract
A double-fed system-based electric water feeding pump system of a boiler of a direct air cooling unit comprises an air cooling island, a water feeding pump, a double-fed motor and the like. The utility model changes the motor of the electric water feeding pump into a double-fed motor, the position of the scoop tube of the hydraulic coupler is fixed at the maximum opening, the slip heat loss is reduced on each load section, the rotating speed of the water feeding pump is adjusted by the double-fed motor, and the operating condition of the water feeding pump is adjusted; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency and can be regulated through the hydraulic coupler. The speed regulation range of the double-fed motor is set according to the accurate rotating speed range required by the actual operation of the water feeding pump, but not 0-100%, so that the waste of the regulation allowance is avoided, and the manufacturing cost is low. Through the implementation of the direct air cooling unit boiler electric feed pump system based on the double-fed system, all operation requirements of the feed pump can be met, the regulation efficiency and the regulation safety of the feed pump in future high-frequency wide-load application scenes are improved, and the direct air cooling unit boiler electric feed pump 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 direct air cooling unit boiler electric feed pump 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 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 water pump is high, and the boiler feed water pump is an important electric energy consumer in a power plant. At present, a great part of electric water feeding pumps of boilers of direct air cooling units adopts a hydraulic coupler to regulate speed, and under a variable working condition, the larger the slip of the electric water feeding pumps of the boilers of the direct air cooling units is, the larger the slip heat loss of the hydraulic coupler is, the lower the speed regulation efficiency is, and the worse the economy is. The rationality of the driving mode and the speed regulating mode of the electric feed pump of the boiler of the direct air cooling unit is very critical to the operation economy of the frequent regulation of the direct air cooling unit under the future high-frequency wide-load scene.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct air cooling unit boiler electric feed pump system based on double-fed system can satisfy the operation demand of all operating modes of feed pump, reduces the station service power rate, improves the regulation efficiency of feed pump under the scene is used to future high frequency wide load and the security of adjusting, 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 water feeding pump system of a boiler of a direct air cooling unit comprises a steam turbine, a generator, an air cooling island, a water feeding pump, a double-fed motor and a hydraulic coupler;
the generator is coaxially connected with the steam turbine, the double-fed motor is connected with the water feeding pump through the hydraulic coupler, the steam exhaust outlet of the steam turbine is connected to the steam inlet of the air cooling island, and the condensed water outlet of the air cooling island is connected to the boiler through the water feeding pump.
The utility model discloses a further improvement lies in, the feed pump passes through the dual feed motor drive.
The utility model discloses a further improvement lies in, the spoon pipe position of fluid coupling is fixed at the maximum aperture.
The utility model discloses further improvement lies in, has reduced slip heat loss on each load section, remains hydraulic coupling's speed governing function, by the rotational speed of double feed motor regulation feed pump to adjust feed pump operating mode.
The utility model discloses further improvement lies in, and the drive mode of feed pump is for the electric drive based on double-fed system, and hydraulic coupling's speed governing function is reserve.
The utility model discloses further improvement lies in, when double-fed motor's speed governing malfunction, double-fed motor power frequency operation, through the hydraulic coupling speed governing.
The utility model discloses further improvement lies in, and double-fed motor's speed governing scope is according to the accurate rotational speed scope setting of the actual motion needs of feed pump.
The utility model discloses further improvement lies in, and the steam turbine's steam extraction removes the boiler heating after the cooling of air cooling island condenses through the feed pump after stepping up.
Compared with the prior art, the utility model changes the motor of the electric water feeding pump into a double-fed motor, the position of the scoop tube of the hydraulic coupler is fixed at the maximum opening, the slip heat loss is reduced on each load section, and the rotating speed of the water feeding pump is adjusted by the double-fed motor, thereby adjusting the operation condition of the water feeding pump; when the speed regulation function of the double-fed motor fails, the double-fed motor runs at power frequency and can still be regulated through the hydraulic coupler. The speed regulation range of the double-fed motor is set according to the rotating speed range required by the actual operation of the water feeding pump, but not 0-100%, so that the waste of regulation allowance is avoided, and the manufacturing cost is low. The beneficial effects of the utility model reside in that:
(1) the method can meet all running states of the boiler feed pump of the direct air cooling unit, improves the regulation efficiency and the regulation safety of the boiler feed pump of the direct air cooling unit in the future high-frequency wide-load application scene, and has huge energy-saving potential.
(2) The double feed motor can directly adjust the rotating speed of the boiler feed pump of the direct air cooling unit, the non-variable frequency simple fine continuous speed regulation of the boiler feed pump of the direct air cooling unit can be realized, a hydraulic coupler or a variable frequency regulation system is omitted, and the regulation efficiency is high.
(3) Compared with the hydraulic coupler adjustment or the variable frequency adjustment of a boiler feed pump of a direct air cooling unit, the double-fed system has the advantages of small occupied area, low manufacturing 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 an electric water feed pump system of a boiler 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 water feeding pump, 5, a hydraulic coupler, 6 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 direct air cooling unit boiler electric water feeding pump system based on double-fed system, which comprises a steam turbine 1, a generator 2, an air cooling island 3, a water feeding pump 4, a double-fed motor 5 and a hydraulic coupler 6; the generator 2 is coaxially connected with the steam turbine 1, the double-fed motor 5 is connected with the water feeding pump 4 through the hydraulic coupler 6, the steam exhaust outlet of the steam turbine 1 is connected to the steam inlet of the air cooling island 3, and the condensed water outlet of the air cooling island 3 is connected to the boiler through the water feeding pump 4.
Working example 1
In a direct air cooling unit provided with an electric water feeding pump, the water feeding pump is driven by a motor, the rotating speed of the water feeding pump is regulated by a hydraulic coupler under variable working conditions, the larger the slip of the hydraulic coupler is, the larger the slip heat loss is, the lower the regulating efficiency of the hydraulic coupler is under the variable working conditions, and the economic operation of the unit is seriously influenced under the application background of frequent regulation. The motor of a boiler electric feed pump of a direct air cooling unit is changed into a double-fed motor, the position of a scoop tube of a hydraulic coupler is fixed at the maximum opening, the slip heat loss is reduced on each load section, the rotating speed of the feed pump is adjusted by the double-fed motor, and the operating condition of the feed pump is adjusted; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency and can be regulated through the hydraulic coupler. The speed regulation range of the double-fed motor is set according to the accurate rotating speed range required by the actual operation of the water feeding pump, but not 0-100%, so that the waste of the regulation allowance is avoided, and the manufacturing cost is low. The direct air cooling unit boiler electric water feeding pump system based on the double-fed system is flexible in operation, simple in operation, strong in availability and high in reliability.
And when the direct air cooling unit normally operates, the operation mode of the boiler electric water feeding pump system of the direct air cooling unit based on the double-fed system is adopted.
1. When the speed regulation function of the double-fed system is normal, the position of the scoop tube of the hydraulic coupler 6 is fixed at the maximum opening, and the running rotating speed of the feed pump 4 is regulated through the double-fed motor 5.
2. When the speed regulation function of the double-fed system fails, the double-fed motor 5 operates at power frequency, the scoop tube of the hydraulic coupler 6 is set up, the speed regulation function of the hydraulic coupler 6 is recovered, and the rotating speed of the feed pump 4 is regulated through the hydraulic coupler 6.
The utility model discloses a direct air cooling unit boiler motor-driven feed pump system based on double-fed system implements, can satisfy all operation demands of boiler feed pump, improves the security of adjusting efficiency and regulation of boiler feed pump under the scene is used to future high frequency wide load, has huge energy-conserving potentiality.
Claims (8)
1. A double-fed system-based electric water feeding pump system of a boiler of a direct air cooling unit is characterized by comprising a steam turbine (1), a generator (2), an air cooling island (3), a water feeding pump (4), a double-fed motor (5) and a hydraulic coupler (6);
the generator (2) is coaxially connected with the steam turbine (1), the double-fed motor (5) is connected with the water feeding pump (4) through the hydraulic coupler (6), the steam exhaust outlet of the steam turbine (1) is connected to the steam inlet of the air cooling island (3), and the condensed water outlet of the air cooling island (3) is connected to the boiler through the water feeding pump (4).
2. A direct air cooling unit boiler electric feed water pump system based on a doubly-fed system according to claim 1, characterized in that the feed water pump (4) is driven by a doubly-fed motor (5).
3. The double-fed system based direct air cooling unit boiler electric feed water pump system of claim 1, characterized in that the position of the scoop pipe of the hydraulic coupling (6) is fixed at the maximum opening.
4. The direct air cooling unit boiler electric feed water pump system based on the double-fed system as claimed in claim 3, characterized in that slip heat loss of the hydraulic coupler (6) is reduced at each load section, the speed regulating function of the hydraulic coupler (6) is reserved, and the double-fed motor (5) is used for regulating the rotating speed of the feed water pump (4) so as to regulate the operation condition of the feed water pump (4).
5. The direct air cooling unit boiler electric feed water pump system based on the double-fed system as claimed in claim 1, characterized in that the feed water pump (4) is driven by electric power based on the double-fed system, and the speed regulation function of the hydraulic coupling (6) is used as a backup.
6. A direct air cooling unit boiler electric water feed pump system based on a double-fed system according to claim 5, characterized in that when the speed regulation function of the double-fed motor (5) fails, the double-fed motor (5) operates at power frequency and the speed is regulated through the hydraulic coupling (6).
7. The direct air cooling unit boiler electric feed water pump system based on the doubly-fed system as claimed in claim 1, characterized in that the speed regulation range of the doubly-fed motor (5) is set according to the precise speed range required by the actual operation of the feed water pump (4).
8. The direct air cooling unit boiler electric water feeding pump system based on the doubly-fed system as claimed in claim 1, characterized in that after the steam discharged from the steam turbine (1) is cooled and condensed in the air cooling island (3), the pressure is increased by the water feeding pump (4) and then the water is heated in the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707020.8U CN215058220U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit boiler electric feed pump system based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120707020.8U CN215058220U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit boiler electric feed pump system based on double-fed system |
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| Publication Number | Publication Date |
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| CN215058220U true CN215058220U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120707020.8U Active CN215058220U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit boiler electric feed pump system based on double-fed system |
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| CN (1) | CN215058220U (en) |
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2021
- 2021-04-08 CN CN202120707020.8U patent/CN215058220U/en active Active
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