CN215058218U - Direct air cooling unit electric preposed feed pump system based on double-fed system - Google Patents
Direct air cooling unit electric preposed feed pump system based on double-fed system Download PDFInfo
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- CN215058218U CN215058218U CN202120706768.6U CN202120706768U CN215058218U CN 215058218 U CN215058218 U CN 215058218U CN 202120706768 U CN202120706768 U CN 202120706768U CN 215058218 U CN215058218 U CN 215058218U
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Abstract
A double-fed system-based electric preposed feed pump system of a direct air cooling unit comprises an air cooling island, a preposed feed 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 direct air cooling unit based on the double-fed system, all operation requirements of the electric preposed feed pump of the boiler can be met, the regulation efficiency and the regulation safety of the preposed feed pump 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 direct air 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 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 electric preposed feed water pump of the direct air cooling unit boiler has higher driving power and is an important electric energy consumer in a power plant. The electric preposed feed pump of the boiler of the direct air cooling unit mostly runs at a constant speed, and under the variable working condition of the direct air cooling unit, the electric preposed feed pump of the boiler has low running efficiency and poor economical efficiency, and is difficult to meet the running requirement of frequent adjustment of the direct air cooling unit in the application scene of high frequency and wide load in the future. Therefore, the rationality of the driving mode and the speed regulating mode of the electric preposed feed pump of the boiler of the direct air cooling unit is very critical to the economical efficiency of the operation 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 motor-driven leading feed pump system based on double-fed system can satisfy the operation demand of all operating modes of the motor-driven leading feed pump of boiler, reduces the station service power rate, improves the regulation efficiency of the motor-driven leading feed pump of boiler 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 preposed feed pump system of a direct air cooling unit comprises a steam turbine, a generator, an air cooling island, a small steam turbine, a feed pump, a boiler electric preposed feed pump and a double-fed motor;
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 electric preposed feed pump of the boiler;
a first steam extraction outlet of the steam turbine is connected to a steam inlet of the small steam turbine, a steam exhaust outlet of the small steam turbine and a steam exhaust outlet of the steam turbine are connected to a steam inlet of the air cooling island, a condensed water outlet of the air cooling island is connected to an inlet of a water feed pump through an electric preposed water feed pump of the boiler, and an outlet of the water feed pump is connected to the boiler.
The utility model discloses further improvement lies in, and the steam import department of little steam turbine is provided with little steam turbine admission governing valve, and the steam extraction exit of little steam turbine is provided with little steam turbine exhaust governing valve.
The utility model discloses further improvement lies in, and the business turn over mouth department of feed pump is provided with feed pump inlet valve and feed pump outlet valve door respectively.
The utility model discloses further improvement lies in, and the business turn over mouth department of the electronic leading feed-water pump of boiler is provided with leading feed-water pump inlet valve and leading feed-water pump outlet valve respectively.
The utility model discloses further improvement lies in, and the steam inlet department of steam turbine is provided with the steam turbine admission governing valve.
The utility model discloses further improvement lies in, under the condition that satisfies the water-feeding pump safe operation needs, adjusts the electronic leading water-feeding pump operating mode of boiler through the rotational speed of double feed motor regulation boiler.
The utility model discloses further improvement lies in, and the driving method of the electronic leading feed-water pump of boiler 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 electronic leading feed-water pump of boiler is fast operation temporarily.
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 the electronic leading feed-water pump of boiler.
The utility model discloses further improvement lies in, and the steam turbine's steam extraction to the air cooling island cooling condense the back, goes the boiler heating after the electronic leading feed pump of boiler and feed pump step up.
Compared with the prior art, the utility model changes the motor of the electric preposed feed pump of the direct air 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 feed pump, the rotating speed of the electric preposed feed pump of the boiler is adjusted through the double-fed motor, and the operation working condition of the electric preposed feed pump of the boiler is adjusted; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency, and the electric preposed feed pump of the boiler 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 electric preposed feed water pump of the boiler, 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 direct air cooling unit boiler can meet all running states of the electric preposed feed pump of the direct air cooling unit boiler, the adjusting efficiency and the adjusting safety of the electric preposed feed pump of the direct air cooling unit boiler under the future high-frequency wide-load application scene are improved, and the electric preposed feed pump of the direct air cooling unit boiler has huge energy-saving potential.
(2) The double feed motor can directly adjust the rotating speed of the electric preposed feed pump of the boiler of the direct air cooling unit, the non-frequency-conversion simple fine continuous speed regulation of the electric preposed feed pump of the boiler of the direct air cooling unit can be realized, 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 direct air cooling unit based on the 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 steam turbine steam inlet regulating valve, 5, a small steam turbine, 6, a small steam turbine steam outlet regulating valve, 7, a water feed pump water outlet valve, 8, a water feed pump, 9, a water feed pump water inlet valve, 10, a preposed water feed pump water outlet valve, 11, a boiler electric preposed water feed pump, 12, a preposed water feed pump water inlet valve, 13, a double-fed motor, 14 and a steam turbine steam inlet regulating valve.
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 electric preposition feed water pump system based on double-fed system, which comprises a steam turbine 1, a generator 2, an air cooling island 3, a small steam turbine 5, a feed water pump 8, a boiler electric preposition feed water pump 11 and a double-fed motor 13; the generator 2 is coaxially connected with the steam turbine 1, the small steam turbine 5 is coaxially connected with the feed pump 8, and the double feed motor 13 is coaxially connected with the electric preposed feed pump 11 of the boiler; 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 and a steam exhaust outlet of the steam turbine 1 are connected to a steam inlet of the air cooling island 3, a condensed water outlet of the air cooling island 3 is connected to an inlet of a water feed pump 8 through an electric preposed water feed pump 11 of the boiler, and an outlet of the water feed pump 8 is connected to the boiler.
Wherein, the steam inlet of the small steam turbine 5 is provided with a small steam turbine admission governing valve 4, and the steam outlet of the small steam turbine 5 is provided with a small steam turbine exhaust governing valve 6. The inlet and outlet of the feed pump 8 are respectively provided with a feed pump inlet valve 9 and a feed pump outlet valve 7. The inlet and outlet of the electric preposed feed pump 11 of the boiler are respectively provided with a preposed feed pump inlet valve 12 and a preposed feed pump outlet valve 10. A steam inlet of the steam turbine 1 is provided with a steam turbine inlet damper 14.
Working example 1
In a certain direct air cooling unit provided with a boiler electric preposed water feeding pump, the boiler electric 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 method is characterized in that a motor of an electric preposed feed water pump of a boiler is changed into a double-fed motor, when the working condition of a unit is changed, the rotating speed of the electric preposed feed water pump of the boiler is adjusted through the double-fed motor under the condition that the safe operation requirement of the feed water pump is met, and the operation working condition of the electric preposed feed water pump of the boiler is adjusted; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency, and the electric preposed feed pump of the boiler 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 electric preposed feed water pump of the boiler, but not 0-100%, so that the waste of regulation allowance is avoided, and the manufacturing cost is low. The direct air cooling unit electric preposed feed water pump system based on the double-fed system 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 direct air cooling unit based on the double-fed system.
1. When the speed regulation function of the double-fed system is normal, the unit operates under variable working conditions, and under the condition that the safe operation requirement of the feed pump 8 is met, the rotating speed of the electric preposed feed pump 11 of the boiler is adjusted through the double-fed motor 13, so that the operation working condition of the electric preposed feed pump 11 of the boiler 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 electric preposed feed water pump 11 of the boiler operates at a temporary constant speed.
Through the implementation of the electric preposed feed pump system of the direct air cooling unit based on the double-fed system, all operation requirements of the electric preposed feed pump of the boiler can be met, the regulation efficiency and the regulation safety of the electric preposed feed pump of the boiler under the future high-frequency wide-load application scene are improved, and the electric preposed feed pump system has huge energy-saving potential.
Claims (9)
1. A double-fed system-based electric preposed feed water pump system of a direct air cooling unit is characterized by comprising a steam turbine (1), a generator (2), an air cooling island (3), a small steam turbine (5), a feed water pump (8), a boiler electric preposed feed water pump (11) and a double-fed motor (13);
the generator (2) is coaxially connected with the steam turbine (1), the small steam turbine (5) is coaxially connected with the water feeding pump (8), and the double-fed motor (13) is coaxially connected with the electric preposed water feeding pump (11) of the boiler;
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) and a steam exhaust outlet of the steam turbine (1) are connected to a steam inlet of the air cooling island (3), a condensed water outlet of the air cooling island (3) is connected to an inlet of a water feeding pump (8) through a boiler electric preposed water feeding pump (11), and an outlet of the water feeding pump (8) is connected to a boiler.
2. The electric preposed feed water pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein 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 of the small turbine (5).
3. The electric preposition feed water pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, characterized in that the inlet and outlet of the feed water pump (8) are respectively provided with a feed water pump inlet valve (9) and a feed water pump outlet valve (7).
4. The direct air cooling unit electric preposition feed water pump system based on the doubly-fed system as claimed in claim 1, characterized in that the boiler electric preposition feed water pump inlet valve (12) and the boiler electric preposition feed water pump outlet valve (10) are respectively arranged at the inlet and the outlet of the boiler electric preposition feed water pump (11).
5. The electric preposition feed water pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, characterized in that a steam turbine inlet throttle (14) is arranged at the steam inlet of the steam turbine (1).
6. The direct air cooling unit electric preposition feed water pump system based on the double-fed system as claimed in claim 1, characterized in that under the condition of meeting the safe operation requirement of the feed water pump (8), the rotating speed of the boiler electric preposition feed water pump (11) is adjusted through the double-fed motor (13), and the operation condition of the boiler electric preposition feed water pump (11) is adjusted.
7. The direct air cooling unit electric pre-feed water pump system based on the double-fed system as claimed in claim 1, characterized in that the boiler electric pre-feed water pump (11) is driven by the electric power based on the double-fed system, when the speed regulation function of the double-fed motor (13) fails, the double-fed motor (13) operates at power frequency, and the boiler electric pre-feed water pump (11) operates at a temporary constant speed.
8. The direct air cooling unit electric pre-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 (13) is set according to the precise speed range required by the actual operation of the boiler electric pre-feed water pump (11).
9. The electric preposed feed water pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, characterized in that after the steam exhausted from the steam turbine (1) and the small steam turbine (5) is cooled and condensed in the air cooling island (3), the steam is boosted by the electric preposed feed water pump (11) and the feed water pump (8) of the boiler and then is heated by the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706768.6U CN215058218U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit electric preposed feed pump system based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706768.6U CN215058218U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit electric preposed feed pump system based on double-fed system |
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| Publication Number | Publication Date |
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| CN215058218U true CN215058218U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120706768.6U Active CN215058218U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit electric preposed feed pump system based on double-fed system |
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| CN (1) | CN215058218U (en) |
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2021
- 2021-04-08 CN CN202120706768.6U patent/CN215058218U/en active Active
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