CN215058217U - Direct air cooling unit condensate pump system based on double-fed system - Google Patents
Direct air cooling unit condensate pump system based on double-fed system Download PDFInfo
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- CN215058217U CN215058217U CN202120706758.2U CN202120706758U CN215058217U CN 215058217 U CN215058217 U CN 215058217U CN 202120706758 U CN202120706758 U CN 202120706758U CN 215058217 U CN215058217 U CN 215058217U
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Abstract
A condensate pump system of a direct air cooling unit based on a double-fed system comprises an air cooling island, a condensate pump, a double-fed motor and the like. The utility model changes the motor of the condensate pump into a double-feed motor, the water feeding regulating valve of the deaerator is fully opened to reduce the throttling loss, the rotating speed of the condensate pump is regulated by the double-feed motor, and the operating condition of the condensate pump is regulated; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency, and the flow of condensed water can be regulated through a water feeding regulating valve of the deaerator. 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 condensate pump, which is not 0-100%, so that the waste of the regulation allowance is avoided, and the manufacturing cost is low. Through the implementation of the condensate pump system of the direct air cooling unit based on the double-fed system, all operation requirements of the condensate pump can be met, the regulation efficiency and the regulation safety of the condensate pump in the future high-frequency wide-load application scene are improved, and the condensate 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 condensate 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 condensate pump has high driving power and is an important electric energy consumer in a power plant. At present, the main adjusting modes of the condensate pump are throttling adjustment and variable frequency adjustment. The throttling regulation is to change the working point of the condensate pump by changing the pipeline characteristic of the condensate system, and the regulation method is reliable, simple and easy to implement, but has poor economical efficiency. The frequency conversion adjustment is to change the rotating speed of the condensate pump by using a frequency converter to adjust the rotating speed of the motor, so that the performance curve of the condensate pump is changed, and the working point of the condensate pump is further changed. The technology of frequency conversion regulation is mature, and the frequency converter is widely applied to speed regulation of pumps and fans of large, medium and small power plants at present, but has the defects of strict requirements on operation environment, high manufacturing cost, large operation and maintenance workload and the like. Therefore, the rationality of the condensate pump driving mode and the speed regulating mode is very critical to the operation economy of the unit frequent regulation in 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 condensate pump system based on double-fed system can satisfy the operation demand of all operating modes of condensate pump, reduces the factory power consumption rate, improves the regulation efficiency and the regulation security of direct air cooling unit condensate 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 condensate 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 condensate pump, a double-fed motor and a deaerator;
the generator is coaxially connected with the steam turbine, and the double-fed motor is coaxially connected with the condensate pump;
the extraction steam outlet of steam turbine is connected to the steam inlet of oxygen-eliminating device, and the exhaust steam outlet of steam turbine is connected to the steam inlet of air cooling island, and the condensate outlet of air cooling island is connected to the condensate inlet of oxygen-eliminating device through condensate pump, and the feedwater export of oxygen-eliminating device is connected to water supply system.
The utility model discloses a further improvement lies in, condensate pump's inlet outlet department is provided with respectively and congeals pump inlet valve and congeals pump outlet valve.
The utility model discloses a further improvement lies in, the exit linkage of condensate pump is provided with the oxygen-eliminating device water feeding transfer door on the condensate inlet pipe of oxygen-eliminating device.
The utility model discloses further improvement lies in, the deaerator is gone up the water transfer door and is opened entirely to reduce the throttle loss, adjust condensate pump's rotational speed by double feed motor, thereby adjust condensate pump operating mode.
The utility model discloses a further improvement lies in, condensate pump passes through the dual feed motor drive.
The utility model discloses further improvement lies in, condensate pump's drive mode is for the electric drive based on double-fed system, and when double-fed motor's speed governing malfunction, the operation of double-fed motor power frequency is temporarily adjusted the operating point of condensate pump through the aperture of adjusting the oxygen-eliminating device water-feeding throttle to adjust condensate flow.
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 condensate pump's actual operation needs.
The utility model discloses further improvement lies in, and the steam extraction of steam turbine removes water supply system to the air cooling island after cooling and condensing, after condensate pump steps up.
Compared with the prior art, the utility model changes the motor of the condensate pump into a double-feed motor, the water feeding regulating valve of the deaerator is fully opened to reduce the throttling loss, the rotating speed of the condensate pump is adjusted by the double-feed motor, and the operating condition of the condensate pump is adjusted; when the double-fed motor fails in speed regulation function, the double-fed motor can continue to drive the condensate pump at power frequency, and at the moment, the characteristic of the pipeline can be adjusted through throttling by temporarily adjusting the water feeding throttle of the deaerator, so that the working point of the condensate pump is adjusted. 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 condensate pump, which is not 0-100%, so that the waste of the 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 condensate pump, improves the regulation efficiency and the regulation safety of the condensate pump in future high-frequency wide-load application scenes, and has huge energy-saving potential.
(2) The double-fed motor can directly adjust the rotating speed of the condensate pump, the simple fine continuous speed regulation of the non-variable frequency of the condensate pump of the direct air cooling unit can be realized, the throttling loss of the water feeding throttle adjustment through the deaerator is avoided, and the adjusting efficiency is high.
(3) Compared with frequency conversion regulation of a condensate pump, 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 the utility model discloses a direct air cooling unit condensate pump system schematic diagram based on double-fed system.
Description of reference numerals:
1. the system comprises a steam turbine, 2, a generator, 3, an air cooling island, 4, a condensate pump water outlet valve, 5, a condensate pump, 6, a condensate pump water inlet valve, 7, a double-fed motor, 8, a deaerator, 9 and a deaerator water feeding 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 condensate pump system based on double-fed system, including steam turbine 1, generator 2, air cooling island 3, condensate pump 5, double feed motor 7 and oxygen-eliminating device 8; the generator 2 is coaxially connected with the steam turbine 1, and the double-fed motor 7 is coaxially connected with the condensate pump 5; the steam extraction outlet of the steam turbine 1 is connected to the steam inlet of the deaerator 8, the steam exhaust outlet of the steam turbine 1 is connected to the steam inlet of the air cooling island 3, the condensed water outlet of the air cooling island 3 is connected to the condensed water inlet of the deaerator 8 through the condensed water pump 5, and the water supply outlet of the deaerator 8 is connected to a water supply system.
Wherein, the inlet and outlet of the condensate pump 5 are respectively provided with a condensate pump inlet valve 6 and a condensate pump outlet valve 4. An outlet of the condensate pump 5 is connected to a condensate inlet pipeline of the deaerator 8, and a deaerator water feeding adjusting door 9 is arranged on the condensate inlet pipeline.
Working example 1
In a direct air cooling unit provided with a condensate pump, the condensate pump is driven by a motor, and the operating condition of the condensate pump is adjusted through a water feeding throttle of a deaerator under a variable working condition, so that the flow of condensate is adjusted. Throttling loss of water feeding and adjusting of the deaerator is large, and economic operation of a unit is seriously influenced under the application background of frequent adjustment. The motor of the condensate pump is changed into a double-fed motor, the opening degree of a water feeding regulating valve on a deaerator is opened to the maximum so as to reduce throttling loss, the rotating speed of the condensate pump is regulated by the double-fed motor, and the operating condition of the condensate pump is regulated; when the speed regulation function of the double-fed motor fails, the double-fed motor operates at power frequency, and the operating condition point of the condensate pump can be adjusted temporarily by adjusting the opening of the water feeding regulating valve of the deaerator, so that the flow of the condensate is adjusted. 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 condensate pump, which is not 0-100%, so that the waste of the regulation allowance is avoided, and the manufacturing cost is low.
The condensate pump system of the direct air cooling unit 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 condensate 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 opening degree of the water feeding regulating valve 9 of the deaerator is opened to the maximum, the throttling loss is reduced, and the running rotating speed of the condensate pump 5 is regulated through the double-fed motor 7.
2. When the speed regulation function of the double-fed system fails, the double-fed motor 7 operates at power frequency, and the operating condition of the condensate pump 5 can be temporarily adjusted by adjusting the opening degree of the water feeding regulating valve 9 of the deaerator, so that the flow of condensate water is adjusted.
Through the implementation of the condensate pump system of the direct air cooling unit based on the double-fed system, all operation requirements of the condensate pump can be met, the regulation efficiency and the regulation safety of the condensate pump in the future high-frequency wide-load application scene are improved, and the condensate pump system has huge energy-saving potential.
Claims (8)
1. A condensate 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 condensate pump (5), a double-fed motor (7) and a deaerator (8);
the generator (2) is coaxially connected with the steam turbine (1), and the double-fed motor (7) is coaxially connected with the condensate pump (5);
the extraction steam outlet of steam turbine (1) is connected to the steam inlet of oxygen-eliminating device (8), the steam extraction outlet of steam turbine (1) is connected to the steam inlet of air cooling island (3), the condensate outlet of air cooling island (3) is connected to the condensate inlet of oxygen-eliminating device (8) through condensate pump (5), the exit linkage of oxygen-eliminating device (8) is to water supply system.
2. The condensate pump system of the doubly-fed system-based direct air cooling unit of claim 1, wherein a condensate pump inlet valve (6) and a condensate pump outlet valve (4) are respectively arranged at an inlet and an outlet of the condensate pump (5).
3. The direct air cooling unit condensate pump system based on the doubly-fed system as claimed in claim 1, wherein a deaerator water supply regulating valve (9) is arranged on an inlet pipeline of the condensate pump (5) connected to the deaerator (8).
4. The condensate pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 3, wherein the water feeding damper (9) of the deaerator is fully opened to reduce throttling loss, and the doubly-fed motor (7) is used for adjusting the rotating speed of the condensate pump (5) so as to adjust the operation condition of the condensate pump (5).
5. The direct air cooling unit condensate pump system based on the doubly-fed system as claimed in claim 1, wherein the condensate pump (5) is driven by a doubly-fed motor (7).
6. The condensate pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the condensate pump (5) is driven by electricity based on the doubly-fed system, when the speed regulation function of the doubly-fed motor (7) fails, the doubly-fed motor (7) operates at power frequency, and the operating point of the condensate pump (5) is temporarily adjusted by adjusting the opening degree of a water feeding throttle (9) of the deaerator, so that the condensate flow is adjusted.
7. The condensate pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the speed regulation range of the doubly-fed motor (7) is set according to the precise rotating speed range required by the actual operation of the condensate pump (5).
8. The direct air cooling unit condensate pump system based on the doubly-fed system as claimed in claim 1, wherein the steam discharged from the steam turbine (1) is sent to the air cooling island (3) for cooling and condensing, and then sent to the water supply system after being boosted by the condensate pump (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706758.2U CN215058217U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit condensate pump system based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706758.2U CN215058217U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit condensate pump system based on double-fed system |
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| Publication Number | Publication Date |
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| CN215058217U true CN215058217U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120706758.2U Active CN215058217U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit condensate pump system based on double-fed system |
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2021
- 2021-04-08 CN CN202120706758.2U patent/CN215058217U/en active Active
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