CN214842578U - Direct air cooling unit slurry circulating pump system based on double-fed system - Google Patents
Direct air cooling unit slurry circulating pump system based on double-fed system Download PDFInfo
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- CN214842578U CN214842578U CN202120706598.1U CN202120706598U CN214842578U CN 214842578 U CN214842578 U CN 214842578U CN 202120706598 U CN202120706598 U CN 202120706598U CN 214842578 U CN214842578 U CN 214842578U
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Abstract
A slurry circulating pump system of a direct air cooling unit based on a double-fed system comprises an air cooling island, a slurry circulating pump, a double-fed motor, a boiler, an induced draft fan, a chimney and the like. The utility model discloses a change the motor of slurry circulating pump into double-fed motor, on each load section, by the rotational speed of double-fed motor regulation slurry circulating pump, adjust slurry circulating pump operating condition, frequently strike and a large amount of operation maintenance work to the factory power grid when avoiding adapting to the variable working condition through the operation number of adjustment pump. The speed regulation range of the double-fed motor is set according to the accurate rotating speed range of the actual operation of the slurry circulating 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 slurry circulating pump system of the direct air cooling unit based on the double-fed system, all operation requirements of the slurry circulating pump can be met, the adjusting efficiency and the adjusting safety of the slurry circulating pump in the future high-frequency wide-load application scene are improved, the reliability is high, the usability is strong, 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 thick liquid circulating 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 power consumption rate of the boiler desulfurization system is about 1.6%, and the power consumption of the slurry circulating water pump accounts for about 40% of the total power consumption of the desulfurization system. The driving power of the slurry circulating pump is high, and the slurry circulating pump is an important electric energy consumer in a power plant. At present, when the unit is in a variable working condition, a slurry circulating pump of a desulfurization system is mainly adapted to the load change of the unit by adjusting the number of running pumps, and frequent starting and stopping of the pumps can cause certain impact on a plant power grid, so that the slurry circulating pump is poor in safety and usability, and is difficult to meet the running requirement of frequent adjustment of a direct air cooling unit in the application scene of high-frequency and wide-load in the future.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a direct air cooling unit thick liquid circulating pump system based on double-fed system can satisfy the operation demand of all operating modes of slurry circulating pump, reduces the factory power consumption, improves the regulation efficiency of slurry circulating 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 slurry circulating pump system of a direct air cooling unit based on a double-fed system comprises a boiler, an induced draft fan, a small steam turbine, a slurry circulating pump, a double-fed motor, a small condenser, a desulfurizing tower, a chimney, an air cooling island and a small condensate pump;
the induced draft fan is coaxially connected with the small steam turbine, and the double-fed motor is coaxially connected with the slurry circulating pump; the flue gas outlet of the boiler is connected to the inlet of an induced draft fan, the outlet of the induced draft fan is connected to the flue gas inlet of the desulfurizing tower, the slurry outlet of the slurry circulating pump is connected to the slurry inlet of the desulfurizing tower, the flue gas outlet of the desulfurizing tower is connected to a chimney, and the desulfurizing tower is also provided with a gypsum outlet;
the exhaust steam outlet of the small steam turbine is connected to the exhaust steam inlet of the small condenser, the condensate outlet of the small condenser is connected to the inlet of the small condensate pump, the exhaust steam of the main steam turbine is connected to the inlet of the air cooling island, and the outlet of the air cooling island and the outlet of the small condensate pump are connected to the heat regenerative system.
The utility model discloses further improvement lies in, still is provided with circulating water on the little condenser and advances, exports.
The utility model discloses further improvement lies in, and little condenser's circulating water import department is provided with little circulating water pump.
The utility model discloses further improvement lies in, and the slurry circulating pump adopts double feed motor drive.
The utility model discloses further improvement lies in, on each load section, by the rotational speed of double feed motor regulation slurry circulating pump to adjust slurry circulating pump operating condition.
The utility model discloses further improvement lies in, and the drive mode of slurry circulating pump is for the electric drive based on double-fed system, and when double-fed motor's speed governing malfunction, double-fed motor can continue the power frequency operation, temporarily adapts to the variable operating mode through the operation number of adjustment slurry circulating pump, treats that double-fed motor speed governing function resumes normal back, continues to be adjusted the operating mode of slurry circulating pump 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 slurry circulating pump, and double-fed motor's speed governing scope is according to the accurate rotational speed scope setting of slurry circulating pump 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 condensation water of air cooling island and goes out the female pipe through little condensate pump, joins the back with the condensation water of main steam turbine exhaust, gets into the regenerative system together.
Compared with the prior art, the utility model changes the motor of the slurry circulating pump into a double-fed motor, and the rotating speed of the slurry circulating pump is adjusted by the double-fed motor on each load section, thereby adjusting the operating condition of the slurry circulating pump; when the speed regulation function of the double-fed motor fails, the double-fed motor can continue to operate at power frequency, the variable working condition can be adapted by temporarily adjusting the number of the operating pumps, and the operating condition of the slurry circulating pump is continuously adjusted by the double-fed motor after the speed regulation function of the double-fed motor is recovered to be normal. The speed regulation range of the double-fed motor is set according to the rotating speed range required by the actual operation of the slurry circulating 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 slurry circulating pump can meet all running states of the slurry circulating pump, the adjusting efficiency and the adjusting safety of the slurry circulating pump in future high-frequency wide-load application scenes are improved, and the energy-saving potential is huge.
(2) The double-fed motor can directly adjust the rotating speed of the slurry circulating pump, the simple fine continuous speed regulation of the non-variable frequency of the slurry circulating pump of the direct air cooling unit can be realized, and the adjusting efficiency is high.
(3) Compared with the original constant-speed operation of a slurry circulating pump, the double-feed system avoids frequent impact of variable working conditions on a power grid and a large amount of operation maintenance work operation only by adjusting the number of running pumps, and has the advantages of small occupied area, low manufacturing cost, high reliability, flexible operation, simple operation and strong usability.
Drawings
Fig. 1 is the utility model discloses a direct air cooling unit slurry circulating pump system schematic diagram based on double-fed system.
Description of reference numerals:
1. the system comprises a boiler, 2, an induced draft fan, 3, a small steam turbine, 4, a slurry circulating pump, 5, a double-feed motor, 6, a small condenser, 7, a desulfurizing tower, 8, a chimney, 9, an air cooling island, 10, a small condensate pump and 11, and a small circulating water pump.
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 slurry circulating pump system based on double-fed system, including boiler 1, draught fan 2, little steam turbine 3, slurry circulating pump 4, double feed motor 5, little condenser 6, desulfurizing tower 7, chimney 8, air cooling island 9 and little condensate pump 10; the induced draft fan 2 is coaxially connected with the small steam turbine 3, and the double-fed motor 5 is coaxially connected with the slurry circulating pump 4; a flue gas outlet of the boiler 1 is connected to an inlet of an induced draft fan 2, an outlet of the induced draft fan 2 is connected to a flue gas inlet of a desulfurizing tower 7, a slurry outlet of a slurry circulating pump 4 is connected to a slurry inlet of the desulfurizing tower 7, a flue gas outlet of the desulfurizing tower 7 is connected to a chimney 8, and a gypsum outlet is further formed in the desulfurizing tower 7; the exhaust steam outlet of the small steam turbine 3 is connected to the exhaust steam inlet of the small condenser 6, the condensate outlet of the small condenser 6 is connected to the inlet of the small condensate pump 10, the small condenser 6 is further provided with a circulating water inlet and a circulating water outlet, the circulating water inlet of the small condenser 6 is provided with a small circulating water pump 11, the exhaust steam of the main steam turbine is connected to the inlet of the air cooling island 9, and the outlet of the air cooling island 9 and the outlet of the small condensate pump 10 are connected to the heat regeneration system.
Example 1
In a certain direct air cooling unit provided with a slurry circulating pump, the slurry circulating pump is driven by a motor, the number of the slurry circulating pumps in operation is adjusted under variable working conditions to adapt to the change of the load of the unit, the adjustment efficiency is low, the reliability is low, the availability is poor by starting and stopping the pumps, and the economic and safe operation of the unit is seriously influenced under the application background of frequent adjustment. The motor of the slurry circulating pump is changed into a double-fed motor, and the rotating speed of the slurry circulating pump is adjusted by the double-fed motor on each load section, so that the operating condition of the slurry circulating pump is adjusted; when the speed regulation function of the double-fed motor fails, the double-fed motor can continue to operate at power frequency, the variable working condition can be adapted by temporarily adjusting the number of the operating pumps, and the operating condition of the slurry circulating pump is continuously adjusted by the double-fed motor after the speed regulation function of the double-fed motor 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 slurry circulating pump, but not 0-100%, so that the waste of the regulation allowance is avoided, and the manufacturing cost is low.
The slurry circulating 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 slurry circulating 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 operation rotating speed of the slurry circulating pump 4 is regulated through the double-fed motor 5.
2. When the speed regulation function of the double-fed motor system fails, the double-fed motor 5 can continue to operate at power frequency, the variable working condition can be adapted by adjusting the number of the operating slurry circulating pumps 4 temporarily, and the operating working condition of the slurry circulating pumps 4 is continuously adjusted by the double-fed motor 5 after the speed regulation function of the double-fed motor 5 is recovered to be normal.
Through the implementation of the slurry circulating pump system of the direct air cooling unit based on the double-fed system, all operation requirements of the slurry circulating pump can be met, and the adjusting efficiency and the adjusting safety of the slurry circulating pump in future high-frequency wide-load application scenes are improved.
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 (8)
1. A slurry circulating pump system of a direct air cooling unit based on a double-fed system is characterized by comprising a boiler (1), an induced draft fan (2), a small steam turbine (3), a slurry circulating pump (4), a double-fed motor (5), a small condenser (6), a desulfurizing tower (7), a chimney (8), an air cooling island (9) and a small condensate pump (10);
the induced draft fan (2) is coaxially connected with the small steam turbine (3), and the double-fed electric motor (5) is coaxially connected with the slurry circulating pump (4); the flue gas outlet of the boiler (1) is connected to the inlet of the draught fan (2), the outlet of the draught fan (2) is connected to the flue gas inlet of the desulfurizing tower (7), the slurry outlet of the slurry circulating pump (4) is connected to the slurry inlet of the desulfurizing tower (7), the flue gas outlet of the desulfurizing tower (7) is connected to the chimney (8), and the desulfurizing tower (7) is also provided with a gypsum outlet;
the exhaust steam outlet of the small steam turbine (3) is connected to the exhaust steam inlet of the small condenser (6), the condensate outlet of the small condenser (6) is connected to the inlet of the small condensate pump (10), the exhaust steam of the main steam turbine is connected to the inlet of the air cooling island (9), and the outlet of the air cooling island (9) and the outlet of the small condensate pump (10) are connected to the heat return system.
2. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the small condenser (6) is further provided with a circulating water inlet and a circulating water outlet.
3. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 2, wherein a small circulation water pump (11) is arranged at a circulating water inlet of the small condenser (6).
4. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, characterized in that the slurry circulation pump (4) is driven by a doubly-fed motor (5).
5. A slurry circulation pump system of a direct air cooling unit based on a double-fed system according to claim 4, characterized in that the rotating speed of the slurry circulation pump (4) is adjusted by the double-fed motor (5) in each load section, so as to adjust the operation condition of the slurry circulation pump (4).
6. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the slurry circulation pump (4) is driven by electricity based on the doubly-fed system, when the speed regulation function of the doubly-fed motor (5) fails, the doubly-fed motor (5) can continue to operate at power frequency, the variable working condition is adapted by temporarily adjusting the number of the operating slurry circulation pumps (4), and after the speed regulation function of the doubly-fed motor (5) returns to normal, the operating condition of the slurry circulation pump (4) continues to be adjusted by the doubly-fed motor (5).
7. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein the system can realize non-frequency conversion simple fine continuous speed regulation of the slurry circulation pump (4) of the direct air cooling unit, and the speed regulation range of the doubly-fed motor (5) is set according to the accurate rotating speed range required by the actual operation of the slurry circulation pump (4).
8. The slurry circulation pump system of the direct air cooling unit based on the doubly-fed system as claimed in claim 1, wherein exhaust steam of the small turbine (3) driven by the induced draft fan (2) is discharged to the small condenser (6) for cooling and condensing, and then is conveyed to a condensate water outlet main pipe of the air cooling island (9) through the small condensate pump (10), and enters the regenerative system together with condensate water discharged by the main turbine after being merged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706598.1U CN214842578U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit slurry circulating pump system based on double-fed system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120706598.1U CN214842578U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit slurry circulating pump system based on double-fed system |
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| Publication Number | Publication Date |
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| CN214842578U true CN214842578U (en) | 2021-11-23 |
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| CN202120706598.1U Active CN214842578U (en) | 2021-04-08 | 2021-04-08 | Direct air cooling unit slurry circulating pump system based on double-fed system |
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| CN (1) | CN214842578U (en) |
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- 2021-04-08 CN CN202120706598.1U patent/CN214842578U/en active Active
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