CN215058219U - Electric preposed feed pump system of wet cooling unit based on double-fed system - Google Patents
Electric preposed feed pump system of wet cooling unit based on double-fed system Download PDFInfo
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- CN215058219U CN215058219U CN202120706859.XU CN202120706859U CN215058219U CN 215058219 U CN215058219 U CN 215058219U CN 202120706859 U CN202120706859 U CN 202120706859U CN 215058219 U CN215058219 U CN 215058219U
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Abstract
A double-fed system-based electric preposed feed water pump system of a wet cooling unit comprises a natural ventilation cooling tower, a preposed feed water pump, a double-fed motor and the like. The utility model changes the motor of the electric preposed water feeding pump into a double-feed motor, when the working condition of the unit changes, under the condition of meeting the safe operation requirement of the water feeding pump, the rotating speed of the preposed water feeding pump is adjusted through the double-feed motor, and the operation working condition of the preposed 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 the preposed feed pump operates at a temporary constant speed. 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 preposed feed pump, which is not 0-100%, the waste of regulation allowance is avoided, and the manufacturing cost is low. Through the implementation of the electric preposed feed pump system of the wet cooling unit based on the double-fed system, all operation requirements of the preposed feed pump can be met, the regulation efficiency and the regulation safety of the preposed feed pump of the wet cooling unit under the future high-frequency wide-load application scene are improved, and the energy-saving potential is huge.
Description
Technical Field
The utility model belongs to power plant boiler and steam turbine system field, concretely relates to wet cooling unit motor-driven leading 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 boiler front feed water pump has high driving power and is an important electric energy consumer in a power plant. At present, the electric preposed feed pump of the wet cooling unit boiler mostly runs at a constant speed, and under a variable working condition, the electric preposed feed pump of the wet cooling unit boiler runs at the constant speed with low efficiency and poor economical efficiency, so that the running requirement of frequent regulation of the unit is difficult to meet under the application scene of high frequency and wide load in the future. Therefore, the rationality of the speed regulation mode of the electric preposed feed pump of the boiler of the wet cooling unit is very critical to the economical efficiency of the operation of the wet 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 wet cold set motor-driven leading feed pump system based on double-fed system can satisfy the operation demand of leading all operating modes of feed pump, reduces the station power rate, improves the security of adjusting efficiency and regulation of leading feed pump under the scene is used to 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 preposed feed pump system of a wet cooling unit comprises a steam turbine, a generator, a condenser, a natural ventilation cooling tower, a circulating water pump, a surface cooler, a feed pump, a deaerator, a preposed feed pump, a small steam turbine, a double-fed motor and a condensate pump;
the generator is coaxially connected with the steam turbine, the small steam turbine is coaxially connected with the feed pump, and the double-fed motor is coaxially connected with the front feed pump;
a first steam extraction outlet of the steam turbine is respectively connected to a steam inlet of the small steam turbine and a steam inlet of the deaerator, an exhaust outlet of the small steam turbine and an exhaust outlet of the steam turbine are connected to a steam inlet of the condenser, a condensed water outlet of the condenser is connected to a condensed water inlet of the deaerator through a condensed water pump, a feed water outlet of the deaerator is connected to an inlet of a feed water pump through a preposed feed water pump, and an outlet of the feed water pump is connected to the boiler;
the circulating water outlet of the natural ventilation cooling tower and the circulating water outlet of the surface cooler are connected to the circulating water inlet of the condenser, and the circulating water outlet of the condenser is respectively connected to the circulating water inlet of the natural ventilation cooling tower and the circulating water inlet of the surface cooler through the circulating water pump.
The utility model discloses further improvement lies in, surface cooler's circulating water import department is provided with the cooler intake valve.
The utility model discloses further improvement lies in, and the steam inlet department of little steam turbine is provided with little steam turbine admission gate.
The utility model discloses further improvement lies in, under the condition that satisfies the water-feeding pump safe operation needs, adjusts leading water-feeding pump operating mode through the rotational speed of double feed motor regulation leading water-feeding pump.
The utility model discloses further improvement lies in, and the drive mode of leading feed pump is for the electric drive based on double-fed system, and when double-fed motor's speed governing malfunction, double-fed motor power frequency operation, the temporary constant speed operation of leading feed pump.
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 leading feed pump.
The utility model discloses further improvement lies in, and the steam turbine's steam extraction to condenser cooling condense the back, goes the boiler heating after leading feed pump and feed pump step up.
The utility model discloses further improvement lies in, falls into two parts behind circulating water pump at the endothermic circulating water in the condenser, and partly get into the direct heat transfer cooling of natural draft cooling tower and air, and another part gets into the cooling of surface cooler through the cooler inlet door, and the circulating water after being cooled gets into the steam extraction of condenser cooling steam turbine and little steam turbine.
Compared with the prior art, the utility model changes the motor of the electric preposed water feeding pump of the wet cooling unit into a double-fed motor, when the working condition of the unit changes, under the condition of meeting the safe operation requirement of the water feeding pump, the rotating speed of the preposed water feeding pump is adjusted through the double-fed motor, and the operation working condition of the preposed 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 the preposed feed pump operates at a temporary constant speed. 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 preposed feed water 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 electric preposed feed pump of the wet cooling unit boiler can meet all running states of the electric preposed feed pump of the wet cooling unit boiler, the adjusting efficiency and the adjusting safety of the electric preposed feed pump of the wet cooling unit boiler under the future high-frequency wide-load application scene are improved, and the electric preposed feed pump of the wet cooling unit boiler has huge energy-saving potential.
(2) The double-fed motor can directly adjust the rotating speed of the electric preposed feed pump of the wet cooling unit boiler, the non-variable-frequency simple fine continuous speed regulation of the electric preposed feed pump of the wet cooling unit boiler can be realized, a hydraulic coupler or a variable-frequency adjusting system is omitted, and the adjusting efficiency is high.
(3) Compared with hydraulic coupler adjustment or variable frequency adjustment, 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 the electric preposed feed pump system of the wet cooling unit based on the double-fed system.
Description of reference numerals:
1. the system comprises a steam turbine, 2, a generator, 3, a condenser, 4, a natural draft cooling tower, 5, a circulating water pump, 6, a cooler water inlet door, 7, a surface cooler, 8, a small steam turbine steam inlet door, 9, a water feeding pump, 10, a deaerator, 11, a front water feeding pump, 12, a small steam turbine, 13, a double-fed motor, 14 and a 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 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 preposition feed water pump system based on double-fed system, including steam turbine 1, generator 2, condenser 3, natural draft cooling tower 4, circulating water pump 5, surface cooler 7, feed water pump 9, oxygen-eliminating device 10, preposition feed water pump 11, small steam turbine 12, double feed motor 13 and condensate pump 14; the generator 2 is coaxially connected with the steam turbine 1, the small steam turbine 12 is coaxially connected with the feed pump 9, and the double feed motor 13 is coaxially connected with the front feed pump 11; a first steam extraction outlet of the steam turbine 1 is respectively connected to a steam inlet of a small steam turbine 12 and a steam inlet of a deaerator 10, a steam exhaust outlet of the small steam turbine 12 and a steam exhaust outlet of the steam turbine 1 are connected to a steam inlet of a condenser 3, a condensed water outlet of the condenser 3 is connected to a condensed water inlet of the deaerator 10 through a condensed water pump 14, a feed water outlet of the deaerator 10 is connected to an inlet of a feed water pump 9 through a preposed feed water pump 11, and an outlet of the feed water pump 9 is connected to a boiler; the circulating water outlet of the natural ventilation cooling tower 4 and the circulating water outlet of the surface cooler 7 are connected to the circulating water inlet of the condenser 3, and the circulating water outlet of the condenser 3 is respectively connected to the circulating water inlet of the natural ventilation cooling tower 4 and the circulating water inlet of the surface cooler 7 through the circulating water pump 5.
Wherein, a cooler water inlet door 6 is arranged at the circulating water inlet of the surface cooler 7. The steam inlet of the small steam turbine 12 is provided with a small steam turbine inlet valve 8.
Working example 1
In a certain wet cooling unit provided with an electric preposed water feeding pump, the preposed water feeding pump is driven by a motor and runs at a constant speed, and the economic running of the unit is seriously influenced under the application background of frequent adjustment. The motor of the electric preposed water feeding pump is changed into a double-fed motor, when the working condition of a unit changes, under the condition of meeting the safe operation requirement of the water feeding pump, the rotating speed of the preposed water feeding pump is adjusted through the double-fed motor, and the operation working condition of the preposed 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 the preposed feed pump operates at a temporary constant speed. 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 preposed feed water pump, but not 0-100%, so that the waste of regulation allowance is avoided, and the manufacturing cost is low. The double-fed system-based electric preposed feed pump system of the wet cooling unit is flexible in operation, simple in operation, strong in availability and high in reliability.
The operation mode of the electric preposed feed water pump system of the wet cooling unit based on the double-fed system.
1. When the speed regulation function of the double-fed system is normal, the wet cooling unit operates under a variable working condition, and under the condition that the requirement of safe operation of the feed pump 9 is met, the rotating speed of the front feed pump 11 is adjusted through the double-fed motor 13, and the operation working condition of the front feed pump 11 is adjusted.
2. When the speed regulation function of the double-fed system fails, the double-fed motor 13 operates at power frequency, and the preposed feed water pump 11 operates at a temporary constant speed.
Through wet cooling unit electric leading feed pump system implementation based on double-fed system, can satisfy all operation demands of leading feed pump, improve wet cooling unit boiler electric leading feed pump regulation efficiency and the security of adjusting under the wide load application scene of future high frequency, have huge energy-conserving potentiality.
Claims (8)
1. A double-fed system-based electric preposed feed water pump system of a wet cooling unit is characterized by comprising a steam turbine (1), a generator (2), a condenser (3), a natural ventilation cooling tower (4), a circulating water pump (5), a surface cooler (7), a feed water pump (9), a deaerator (10), a preposed feed water pump (11), a small steam turbine (12), a double-fed motor (13) and a condensate pump (14);
the generator (2) is coaxially connected with the steam turbine (1), the small steam turbine (12) is coaxially connected with the water feeding pump (9), and the double-fed motor (13) is coaxially connected with the preposed water feeding pump (11);
a first steam extraction outlet of the steam turbine (1) is respectively connected to a steam inlet of a small steam turbine (12) and a steam inlet of a deaerator (10), a steam exhaust outlet of the small steam turbine (12) and a steam exhaust outlet of the steam turbine (1) are connected to a steam inlet of a condenser (3), a condensed water outlet of the condenser (3) is connected to a condensed water inlet of the deaerator (10) through a condensed water pump (14), a water supply outlet of the deaerator (10) is connected to an inlet of a water supply pump (9) through a preposed water supply pump (11), and an outlet of the water supply pump (9) is connected to a boiler;
the circulating water outlet of the natural ventilation cooling tower (4) and the circulating water outlet of the surface cooler (7) are connected to the circulating water inlet of the condenser (3), and the circulating water outlet of the condenser (3) is respectively connected to the circulating water inlet of the natural ventilation cooling tower (4) and the circulating water inlet of the surface cooler (7) through the circulating water pump (5).
2. The double-fed system-based electric pre-feed water pump system of the wet cooling unit is characterized in that a cooler water inlet door (6) is arranged at a circulating water inlet of the surface cooler (7).
3. The double-fed system based wet cooling unit electric preposition feed water pump system of claim 1, characterized in that a small turbine inlet valve (8) is arranged at the steam inlet of the small turbine (12).
4. The electric preposed feed water pump system of the wet cooling unit based on the double-fed system as claimed in claim 1, characterized in that under the condition of meeting the requirement of safe operation of the feed water pump (9), the rotating speed of the preposed feed water pump (11) is adjusted through the double-fed motor (13), and the operation condition of the preposed feed water pump (11) is adjusted.
5. The electric preposed feed water pump system of the wet cooling unit based on the double-fed system as claimed in claim 1, characterized in that the preposed feed water pump (11) is driven by electric power based on the double-fed system, when the speed regulating function of the double-fed motor (13) fails, the double-fed motor (13) operates at power frequency, and the preposed feed water pump (11) operates at a temporary constant speed.
6. The electric preposition feed water pump system of the double-fed system-based wet cooling unit is characterized in that the speed regulation range of the double-fed motor (13) is set according to the accurate rotating speed range required by the actual operation of the preposition feed water pump (11).
7. The electric preposed feed water pump system of the wet cooling unit based on the double-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 condenser (3), the steam is boosted by the preposed feed water pump (11) and the feed water pump (9) and then is heated in a boiler.
8. The electric preposed feed water pump system of the doubly-fed system-based wet cooling unit is characterized in that circulating water absorbing heat in a condenser (3) is divided into two parts after passing through a circulating water pump (5), one part enters a natural draft cooling tower (4) to be directly subjected to heat exchange with air for cooling, the other part enters a surface cooler (7) through a cooler water inlet valve (6) for cooling, and the cooled circulating water enters the condenser (3) to cool exhaust steam of a steam turbine (1) and a small steam turbine (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706859.XU CN215058219U (en) | 2021-04-08 | 2021-04-08 | Electric preposed feed pump system of wet cooling unit based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706859.XU CN215058219U (en) | 2021-04-08 | 2021-04-08 | Electric preposed feed pump system of wet cooling unit based on double-fed system |
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| Publication Number | Publication Date |
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| CN215058219U true CN215058219U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120706859.XU Active CN215058219U (en) | 2021-04-08 | 2021-04-08 | Electric preposed feed pump system of wet cooling unit based on double-fed system |
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| CN (1) | CN215058219U (en) |
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2021
- 2021-04-08 CN CN202120706859.XU patent/CN215058219U/en active Active
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