CN215058305U - Direct air cooling unit primary air fan system based on double-fed system - Google Patents
Direct air cooling unit primary air fan system based on double-fed system Download PDFInfo
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- CN215058305U CN215058305U CN202120706569.5U CN202120706569U CN215058305U CN 215058305 U CN215058305 U CN 215058305U CN 202120706569 U CN202120706569 U CN 202120706569U CN 215058305 U CN215058305 U CN 215058305U
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Abstract
A primary fan system of a direct air cooling unit based on a double-fed system comprises an air cooling island, a primary fan, a double-fed motor, a boiler, an induced draft fan and the like. The utility model discloses a change the motor of a fan into double-fed motor, on each load section, adjust a fan operating condition by the rotational speed of double-fed motor regulation fan, adjust efficient, the reliability is high, usability is strong. The speed regulation range of the double-fed motor is set according to the accurate rotating speed range of the actual operation of the primary fan, so that the waste of regulation allowance is avoided, and the manufacturing cost is low. Through the implementation of the primary fan system of the direct air cooling unit based on the double-fed system, all operation requirements of the primary fan can be met, the regulation efficiency and the regulation safety of the primary fan in 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 primary air fan 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 primary fan has high driving power and is an important electric energy consumer in a power plant. At present, when a direct air cooling unit is in a variable working condition, the operation working condition of a primary fan is mainly adjusted through the angle of a movable blade so as to adapt to the load change of the unit.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct air cooling unit primary air fan system based on double-fed system can satisfy the regulation operation demand of all operating modes of primary air fan, reduces the factory power consumption, improves the regulation efficiency of primary air fan 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 primary fan system of a direct air cooling unit comprises a hearth, an air preheater, a double-fed motor, a primary fan, a silencer, an induced draft fan, a small steam turbine, a small condenser, a small condensate pump and an air cooling island;
the double-fed motor is coaxially connected with the primary fan, and the small steam turbine is coaxially connected with the induced draft fan;
the outlet of the muffler is connected to the inlet of a primary air fan, the outlet of the primary air fan is divided into two paths, one path is connected to the air inlet of the hearth through an air preheater, the other path is directly connected to the air inlet of the hearth, the flue gas outlet of the hearth is connected to the inlet of an induced draft fan through the air preheater, and the outlet of the induced draft fan is connected to a flue gas purification device;
the exhaust steam outlet of the small steam turbine is connected to the steam inlet of the small condenser, the condensed water outlet of the small condenser is connected to the inlet of the small condensed water pump, the exhaust steam of the main steam turbine is connected with the steam inlet of the air cooling island, and the condensed water outlet of the air cooling island and the outlet of the small condensed water pump are connected to the heat regeneration system.
The utility model discloses further improvement lies in, is provided with circulating water on the little condenser and advances, exports.
The utility model discloses further improvement lies in, and the primary air fan adopts the dual feed motor drive.
The utility model discloses further improvement lies in, on each load section, by the rotational speed of double feed motor regulation fan to adjust fan operating mode.
The utility model discloses further improvement lies in, and the drive mode of primary air fan is for the electric drive based on double-fed system, and when double-fed motor's speed governing malfunction, double-fed motor continues the power frequency operation, temporarily adjusts the operating mode of primary air fan through movable blade angle, treats double-fed motor speed governing function normal back, continues to be adjusted the operating mode of primary air fan by double-fed motor.
The utility model discloses further improvement lies in, the simple continuous speed governing that becomes more meticulous of non-frequency conversion that this system can realize direct air cooling unit fan, and double-fed motor's speed governing scope is according to the accurate rotational speed scope setting of fan actual operation needs.
The utility model discloses further improvement lies in, and the exhaust steam of the little steam turbine of drive of draught fan is arranged to little condenser cooling and is condensed the back, carries to the female pipe of air cooling island condensate outlet through little condensate pump, joins the back with the condensate of main steam turbine exhaust, gets into the backheat system together.
The utility model has the further improvement that the air is sucked by the primary fan and is called primary air, and one part of the air is heated by the flue gas through the air preheater and is called hot primary air which enters the boiler; the other part is directly sent to the boiler and is called cold primary air.
The utility model discloses further improvement lies in, hot flue gas comes out the back from the boiler, after air preheater heating primary air, has removed fume purification device through the draught fan, and the flue gas up to standard after the purification will be discharged into the atmosphere.
Compared with the prior art, the utility model changes the motor of the primary fan into a double-fed motor, and the rotating speed of the primary fan is adjusted by the double-fed motor on each load section, thereby adjusting the operating condition of the primary fan; when the double-fed motor speed regulation function is failed, the double-fed motor can continue to operate at the power frequency, the operation condition of the primary fan can be adjusted temporarily through the angle adjustment of the movable blade, and after the double-fed motor speed regulation function is recovered to be normal, the operation condition of the primary fan is continuously adjusted by the double-fed motor. The speed regulation range of the double-fed motor is set according to the rotating speed range required by the actual operation of the primary fan, 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 primary fan of the direct air cooling unit, improves the regulation efficiency and the regulation safety of the primary fan of the direct air cooling unit in the future high-frequency wide-load application scene, and has huge energy-saving potential.
(2) The double-fed motor can directly adjust the rotating speed of the primary fan, the simple fine continuous speed regulation of the non-variable frequency of the primary fan of the direct air cooling unit can be realized, and the adjusting efficiency is high.
(3) Compare in the original movable blade of primary air fan and adjust or throttle and adjust, this double-fed system's area is very little, and the cost is low, and the operation is nimble, easy operation, and usability is strong, and the reliability is high, adjusts the precision height, adjusts efficiently.
Drawings
Fig. 1 is a schematic diagram of a primary air fan system of a direct air cooling unit based on a double-fed system.
Description of reference numerals:
1. the device comprises a hearth, 2, an air preheater, 3, a double-fed motor, 4, a primary fan, 5, a silencer, 6, an induced draft fan, 7, a small steam turbine, 8, a small condenser, 9, a small condensate pump, 10 and an air cooling island.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
As shown in fig. 1, the utility model provides a direct air cooling unit primary air fan system based on double-fed system, including furnace 1, air preheater 2, double feed motor 3, primary air fan 4, muffler 5, draught fan 6, small steam turbine 7, small condenser 8, small condensate pump 9 and air cooling island 10; the double-fed motor 3 is coaxially connected with the primary fan 4, and the small steam turbine 7 is coaxially connected with the induced draft fan 6; the outlet of the silencer 5 is connected to the inlet of the primary fan 4, the outlet of the primary fan 4 is divided into two paths, one path is connected to the air inlet of the hearth 1 through the air preheater 2, the other path is directly connected to the air inlet of the hearth 1, the flue gas outlet of the boiler 1 is connected to the inlet of the induced draft fan 6 through the air preheater 2, and the outlet of the induced draft fan 6 is connected to the flue gas purification device; the exhaust steam outlet of the small steam turbine 7 is connected to the steam inlet of the small condenser 8, the condensed water outlet of the small condenser 8 is connected to the inlet of the small condensed water pump 9, the exhaust steam of the main steam turbine is connected with the steam inlet of the air cooling island 10, the condensed water outlet of the air cooling island 10 and the outlet of the small condensed water pump 9 are connected to the heat return system, and the small condenser 8 is provided with a circulating water inlet and a circulating water outlet.
Example 1
The method has the advantages of slow adjustment, high failure rate and low adjustment precision, and seriously influences the economic operation of the unit under the application background of frequent adjustment. The motor of the primary fan is changed into a double-fed motor, and the rotating speed of the primary fan and the operating condition of the primary fan are adjusted by the double-fed motor on each load section; when the double-fed motor speed regulation function is failed, the double-fed motor can continue to operate at power frequency, the variable working condition can be adapted by adjusting the angle of the movable blade temporarily, and the operation working condition of the primary fan is continuously adjusted by the double-fed motor after the double-fed motor speed regulation function is recovered to be normal. The speed regulation range of the double-fed motor is set according to the accurate rotating speed range of the actual operation of the primary fan, but not 0-100%, so that the waste of regulation allowance is avoided, and the manufacturing cost is low.
The direct air cooling unit primary air fan 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 primary fan 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 running rotating speed of the primary fan 4 is regulated through the double-fed motor 3.
2. When the speed regulation function of the double-fed motor system fails, the double-fed motor 3 operates at power frequency, the variable working condition can be adapted by adjusting the angle of the movable blade of the primary fan 4 temporarily, and the operation working condition of the primary fan 4 is continuously adjusted by the double-fed motor 3 after the speed regulation function of the double-fed motor 3 is recovered to be normal.
Through the implementation of the primary fan system of the direct air cooling unit based on the double-fed system, all operation requirements of the primary fan can be met, the regulation efficiency and the regulation safety of the primary fan under the future high-frequency wide-load application scene are improved, and the energy-saving system has huge energy-saving potential.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (9)
1. A double-fed system-based primary fan system of a direct air cooling unit is characterized by comprising a hearth (1), an air preheater (2), a double-fed motor (3), a primary fan (4), a silencer (5), an induced draft fan (6), a small steam turbine (7), a small condenser (8), a small condensate pump (9) and an air cooling island (10);
the double-fed motor (3) is coaxially connected with the primary fan (4), and the small steam turbine (7) is coaxially connected with the induced draft fan (6);
the outlet of the silencer (5) is connected to the inlet of the primary fan (4), the outlet of the primary fan (4) is divided into two paths, one path is connected to the air inlet of the hearth (1) through the air preheater (2), the other path is directly connected to the air inlet of the hearth (1), the flue gas outlet of the hearth (1) is connected to the inlet of the induced draft fan (6) through the air preheater (2), and the outlet of the induced draft fan (6) is connected to the flue gas purification device;
the exhaust steam outlet of the small steam turbine (7) is connected to the steam inlet of the small condenser (8), the condensed water outlet of the small condenser (8) is connected to the inlet of the small condensed water pump (9), the exhaust steam of the main steam turbine is connected with the steam inlet of the air cooling island (10), and the condensed water outlet of the air cooling island (10) and the outlet of the small condensed water pump (9) are connected to the heat return system.
2. The doubly-fed system-based primary air fan system of the direct air cooling unit as claimed in claim 1, wherein the small condenser (8) is provided with a circulating water inlet and a circulating water outlet.
3. The doubly-fed system-based primary fan system of the direct air cooling unit according to claim 1, wherein the primary fan (4) is driven by a doubly-fed motor (3).
4. The doubly-fed system-based primary fan system of the direct air cooling unit of claim 3, wherein the doubly-fed motor (3) is used for adjusting the rotating speed of the primary fan (4) in each load section, so that the operating condition of the primary fan (4) is adjusted.
5. The doubly-fed system-based primary fan system of the direct air cooling unit is characterized in that the primary fan (4) is driven by electricity based on a doubly-fed system, when the speed regulation function of the doubly-fed motor (3) fails, the doubly-fed motor (3) continues to operate at the power frequency, the operation condition of the primary fan (4) is adjusted through the angle of the movable blade temporarily, and after the speed regulation function of the doubly-fed motor (3) is recovered to be normal, the operation condition of the primary fan (4) is continuously adjusted by the doubly-fed motor (3).
6. The doubly-fed system-based primary fan system of the direct air cooling unit according to claim 1, wherein the system can realize non-frequency conversion, simple and fine continuous speed regulation of the primary fan (4) of the direct air cooling unit, and the speed regulation range of the doubly-fed motor (3) is set according to an accurate rotating speed range required by actual operation of the primary fan (4).
7. The double-fed system-based primary air fan system of the direct air cooling unit is characterized in that exhaust steam of a small turbine (7) driven by a draught fan (6) is discharged to a small condenser (8) for cooling and condensing, then is conveyed to a condensate outlet main pipe of an air cooling island (10) through a small condensate pump (9), and enters a heat regenerative system together with condensate discharged by a main turbine after being converged.
8. The double-fed system based primary air fan system of the direct air cooling unit of claim 1, characterized in that after being silenced by the silencer (5), the air is called primary air after passing through the primary air fan (4), and after being heated by the flue gas by the air preheater (2), a part of the air is called hot primary air and enters the boiler (1); the other part is directly sent to the boiler (1) and is called as cold primary air.
9. The double-fed system-based primary fan system of the direct air cooling unit according to claim 1, wherein after the hot flue gas comes out of the boiler (1), the hot flue gas is heated by the air preheater (2) for primary air, and then the flue gas purification device is removed by the induced draft fan (6), and the purified flue gas reaching the standard is discharged into the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706569.5U CN215058305U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit primary air fan system based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706569.5U CN215058305U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit primary air fan system based on double-fed system |
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| CN215058305U true CN215058305U (en) | 2021-12-07 |
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| CN202120706569.5U Active CN215058305U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit primary air fan system based on double-fed system |
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- 2021-04-08 CN CN202120706569.5U patent/CN215058305U/en active Active
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