CN109813137A - A kind of vacuum pump system that can be contributed according to suction air capacity adjustment - Google Patents
A kind of vacuum pump system that can be contributed according to suction air capacity adjustment Download PDFInfo
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- CN109813137A CN109813137A CN201910189559.6A CN201910189559A CN109813137A CN 109813137 A CN109813137 A CN 109813137A CN 201910189559 A CN201910189559 A CN 201910189559A CN 109813137 A CN109813137 A CN 109813137A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses it is a kind of can be according to the vacuum pump system of suction air capacity adjustment power output, including condenser (1), leak into air-flow measurement device (2), vacuum pump (3), motor (4), frequency-conversion control cabinet (5) and steam-water separator (6).The present invention will control the revolving speed of vacuum pump by vacuum pump frequency-converting control device according to condenser and vacuum system leaked-in air flow, realize the operation of vacuum pump optimum state, reach optimum energy-saving effect.The present invention can reduce the power consumption of vacuum pump, be conducive to the whole economic efficiency for improving thermal power plant by implementing changeable vacuum pump system.
Description
Technical Field
The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a vacuum pump system capable of adjusting output according to the amount of sucked air.
Background
In the thermodynamic cycle of a modern condensing steam turbine unit, condensing equipment plays a role of a cold source, and the vacuum degree of a condenser has great influence on the efficiency and the power of a steam turbine device according to the working principle of a steam turbine. The establishment and maintenance of the turbine vacuum are all undertaken by the vacuum pump, the vacuum is established at the initial starting stage of the unit, and after the unit normally operates, noncondensable gas leaking into the condenser is continuously pumped out of the vacuum system so as to maintain the condenser in a high vacuum state, and the vacuum pump plays a decisive role in the change of the unit vacuum.
The operation mode of the vacuum pump of the power plant at present mainly comprises: two transporting and one standby or one transporting and one standby. When the vacuum system is subjected to leakage detection treatment, the flow of non-condensable gas leaking into the condenser is reduced, and the operation mode of the vacuum pump system is unchanged.
The vacuum pump system capable of adjusting the output according to the sucked air amount can adjust the output of the vacuum pump according to the flow change of the non-condensed gas in the condenser, so that the optimal state operation of the vacuum pump is realized, and the economic operation of the unit is further realized.
Disclosure of Invention
The invention aims to provide a vacuum pump system capable of adjusting output according to the amount of sucked air, which can adjust output according to the change of the amount of sucked air, thereby having energy-saving potential.
The invention is realized by adopting the following technical scheme:
a vacuum pump system capable of adjusting output according to the amount of sucked air comprises a condenser, a leaked air flow measuring device, a vacuum pump, a motor, a variable frequency control cabinet and a steam-water separator; wherein,
the steam-water outlet of the condenser is communicated with the inlet of the vacuum pump, the outlet of the vacuum pump is communicated with the steam-water inlet of the steam-water separator, and the steam-water separator is also provided with an air outlet and a condensed water outlet; the leaked air flow measuring device is arranged on a pipeline communicated with a steam outlet of the condenser and an inlet of the vacuum pump, an output end of the leaked air flow measuring device is connected with an input end of the variable frequency control cabinet, and the variable frequency control cabinet is used for controlling the rotating speed of the motor and further controlling the rotating speed of the vacuum pump.
The invention is further improved in that the number of the vacuum pumps is 1 or more.
The invention is further improved in that when the condenser is in operation, the rotating speed of the motor is controlled through the variable frequency control cabinet according to the flow rate of air leaked into the condenser measured by the air leakage flow measuring device, so that the rotating speed of the vacuum pump is controlled, the vacuum pump pumps out air, non-condensable gas and part of wet steam in the condenser, the air, the non-condensable gas and the part of wet steam are separated in the steam-water separator, the air and the non-condensable gas are discharged into the atmosphere, and the wet steam is condensed into condensed water and discharged into a hot well of the condenser.
The invention has the further improvement that when the flow rate of the air leaked into the condenser measured by the leaked air flow measuring device is increased, the frequency conversion control cabinet acts, the motor drives the rotating speed of the vacuum pump to be increased, the suction amount of the vacuum pump is increased, and redundant air is pumped out; similarly, when the flow rate of the air leaked into the condenser measured by the air leakage flow measuring device is reduced, the frequency conversion control cabinet acts, the rotating speed of the vacuum pump driven by the motor is reduced, and the suction capacity of the vacuum pump is reduced, so that the best energy-saving effect is achieved.
The invention has the following beneficial technical effects:
the invention provides a vacuum pump system capable of adjusting output according to the amount of sucked air, which comprises a condenser, an air leakage flow measuring device, a vacuum pump, a motor, a variable frequency control cabinet and a steam-water separator, wherein the condenser is connected with the vacuum pump; when the device works, the rotating speed of the motor is controlled through the variable frequency control cabinet according to the flow rate of air leaked into the condenser measured by the air leakage flow measuring device, so that the rotating speed of the vacuum pump is controlled, the vacuum pump pumps out air, non-condensable gas and part of wet steam in the condenser, the air, the non-condensable gas and the part of the wet steam are separated in the steam-water separator, the air and the non-condensable gas are discharged into the atmosphere, and the wet steam is condensed into condensed water and discharged into a hot well of the condenser.
In summary, the output of the vacuum pump can be adjusted according to the change of the air quantity, and the larger the frequency change range is, the more accurate the air quantity monitoring is, and the easier the energy saving is. Therefore, the problem of energy waste caused by constant-speed operation of the vacuum pump is avoided.
Drawings
FIG. 1 is a schematic view of a vacuum pumping system of the present invention with adjustable output based on the amount of air drawn;
description of reference numerals:
1. the device comprises a condenser, 2, a leaked air flow measuring device, 3, a vacuum pump, 4, a motor, 5, a variable frequency control cabinet, 6 and a steam-water separator.
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 described herein are merely for purposes of illustration and explanation and are not intended to limit the present invention.
As shown in fig. 1, the vacuum pump system for adjusting output according to the amount of sucked air provided by the invention comprises a condenser 1, an air leakage detector 2, a vacuum pump 3, a motor 4, a variable frequency control cabinet 5 and a steam-water separator 6; wherein, install air leakage amount detector 2 on the air extraction pipeline of condenser 1, install converter 5 on the motor 4 of vacuum pump, when detector 2 detects that air leakage amount increases, converter 5 acts on. Specifically, a steam-water outlet of the condenser 1 is communicated with an inlet of a vacuum pump 3, an outlet of the vacuum pump 3 is communicated with a steam-water inlet of a steam-water separator 6, and an air outlet and a condensed water outlet are also arranged on the steam-water separator 6; the leaked air flow measuring device 2 is arranged on a pipeline communicated with a steam outlet of the condenser 1 and an inlet of the vacuum pump 3, an output end of the leaked air flow measuring device is connected with an input end of the variable frequency control cabinet 5, and the variable frequency control cabinet 5 is used for controlling the rotating speed of the motor 4 so as to control the rotating speed of the vacuum pump 3.
When the device works, the rotating speed of the motor 4 is controlled through the variable frequency control cabinet 5 according to the air leakage flow of the condenser 1 measured by the air leakage flow measuring device 2, so that the rotating speed of the vacuum pump 3 is controlled, the vacuum pump 3 pumps out air, non-condensable gas and part of wet steam in the condenser 1 and separates the air, the non-condensable gas and the part of the wet steam in the steam-water separator 6, the air and the non-condensable gas are discharged into the atmosphere, and the wet steam is condensed into condensed water and discharged into a hot well of the condenser 1. When the flow of air leaked into the condenser 1 is increased, the variable frequency control cabinet 5 acts, the rotating speed of the motor 4 is increased, the rotating speed of the vacuum pump 3 is driven to be increased, the suction capacity of the vacuum pump 3 is increased, and redundant air is pumped out; similarly, when the air flow leaked into the condenser 1 is reduced, the variable frequency control cabinet 5 acts, the rotating speed of the motor 4 is reduced, the rotating speed of the vacuum pump 3 is also reduced, and the suction quantity of the vacuum pump 3 is reduced, so that the optimal state operation of the vacuum pump 3 is realized, and the optimal energy-saving effect is achieved.
Example 1
The rated load of a certain unit is 600MW, the rated backpressure of a double-backpressure condenser is 5.4kPa, 3 vacuum pumps are arranged, 2 of the vacuum pumps operate and 1 of the vacuum pumps is reserved, the rated power of a single pump is 160kW, the rated suction capacity is 65kg/h (the amount of dry air extracted), the rated rotating speed is 590r/min, and other operating parameters of the unit are kept stable.
The air amount leaked into the condenser is 130kg/h when the unit normally operates under the rated load, at the moment, two vacuum pumps are required to work together to pump out air and non-condensable gas in the condenser, and the power consumption of a vacuum system is 320 kW. The unit is subjected to vacuum leakage detection treatment, the air amount leaked into the condenser is reduced to 90kg/h when the unit normally operates under the rated load, the rotating speed of the vacuum pump is reduced to 408r/min to operate according to the similar principle, the power consumption of the vacuum pump system is 106kW, and the power consumption of the vacuum system is reduced by 214 kW.
A comparison of the energy consumption before and after the addition of the vacuum system, the output of which can be adjusted according to the amount of air sucked, is shown in Table 1.
TABLE 1 comparison of front and rear energy consumption of vacuum system with addition of adjustable output depending on the amount of air drawn
Claims (5)
1. A vacuum pump system capable of adjusting output according to the amount of sucked air is characterized by comprising a condenser (1), a leaked air flow measuring device (2), a vacuum pump (3), a motor (4), a variable frequency control cabinet (5) and a steam-water separator (6); wherein,
a steam-water outlet of the condenser (1) is communicated with an inlet of the vacuum pump (3), an outlet of the vacuum pump (3) is communicated with a steam-water inlet of the steam-water separator (6), and an air outlet and a condensed water outlet are also arranged on the steam-water separator (6); the leaked air flow measuring device (2) is arranged on a pipeline communicated with a steam outlet of the condenser (1) and an inlet of the vacuum pump (3), an output end of the leaked air flow measuring device is connected with an input end of the variable frequency control cabinet (5), and the variable frequency control cabinet (5) is used for controlling the rotating speed of the motor (4) so as to control the rotating speed of the vacuum pump (3).
2. A vacuum pump system with adjustable output as a function of the amount of air extracted, as claimed in claim 1, characterized in that the number of vacuum pumps (3) is 1 or more.
3. Vacuum pump system with adjustable output according to the extracted air quantity according to claim 1, characterized in that the condenser (1) is a double back pressure condenser.
4. The vacuum pump system capable of adjusting output according to the amount of sucked air as claimed in claim 1, wherein, in operation, the rotation speed of the vacuum pump (3) is controlled by controlling the rotation speed of the motor (4) through the variable frequency control cabinet (5) according to the flow rate of the leaked air of the condenser (1) measured by the leaked air flow measuring device (2), the vacuum pump (3) pumps out the air, the non-condensable gas and part of the wet steam in the condenser (1) and separates the air and the non-condensable gas in the steam-water separator (6), the air and the non-condensable gas are exhausted to the atmosphere, and the wet steam is condensed into condensed water and is exhausted.
5. The vacuum pump system capable of adjusting output according to the sucked air amount is characterized in that when the flow rate of the leaked air of the condenser (1) measured by the leaked air flow measuring device (2) is increased, the variable frequency control cabinet (5) acts, the motor (4) drives the vacuum pump (3) to increase the rotating speed, the suction amount of the vacuum pump (3) is increased, and the redundant air is pumped out; similarly, when the flow rate of the air leaked into the condenser (1) and measured by the leaked air flow measuring device (2) is reduced, the variable frequency control cabinet (5) acts, the motor (4) drives the vacuum pump (3) to reduce the rotating speed, and the vacuum pump (3)
The pumping amount is reduced, thereby achieving the best energy-saving effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910189559.6A CN109813137A (en) | 2019-03-13 | 2019-03-13 | A kind of vacuum pump system that can be contributed according to suction air capacity adjustment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910189559.6A CN109813137A (en) | 2019-03-13 | 2019-03-13 | A kind of vacuum pump system that can be contributed according to suction air capacity adjustment |
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| CN109813137A true CN109813137A (en) | 2019-05-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143090A (en) * | 2022-07-13 | 2022-10-04 | 西安热工研究院有限公司 | Method for determining performance of water ring vacuum pump of vacuum pumping system of thermal power generating unit |
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|---|---|---|---|---|
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| JPH10299418A (en) * | 1997-04-23 | 1998-11-10 | Hitachi Ltd | Air discharging system |
| CN105202937A (en) * | 2015-10-10 | 2015-12-30 | 中联西北工程设计研究院有限公司 | Cavitation-free low-noise condenser vacuumizing energy-saving device |
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| CN109340114A (en) * | 2018-12-07 | 2019-02-15 | 江苏方天电力技术有限公司 | Steam turbine Roots-water ring vacuum pump frequency control extract system and its control method |
| CN209689415U (en) * | 2019-03-13 | 2019-11-26 | 西安热工研究院有限公司 | A kind of vacuum pump system that can be contributed according to suction air capacity adjustment |
-
2019
- 2019-03-13 CN CN201910189559.6A patent/CN109813137A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU830170A1 (en) * | 1979-07-30 | 1981-05-15 | Производственное Объединение По Наладкесовершенствованию Технологиии Эксплуатации Электростанцийи Сетей "Средазтехэнерго" | Device for detecting vacuum system leaks |
| JPH10299418A (en) * | 1997-04-23 | 1998-11-10 | Hitachi Ltd | Air discharging system |
| CN105202937A (en) * | 2015-10-10 | 2015-12-30 | 中联西北工程设计研究院有限公司 | Cavitation-free low-noise condenser vacuumizing energy-saving device |
| CN206832075U (en) * | 2017-05-26 | 2018-01-02 | 中国能源建设集团广东省电力设计研究院有限公司 | Condenser vacuumizes energy-saving driving system |
| CN107246807A (en) * | 2017-06-23 | 2017-10-13 | 大唐东北电力试验研究所有限公司 | Efficiently adjustable vacuum control method and system for power plant |
| CN207050497U (en) * | 2017-06-23 | 2018-02-27 | 大唐东北电力试验研究所有限公司 | Efficiently adjustable vacuum-control(led) system for power plant |
| CN109340114A (en) * | 2018-12-07 | 2019-02-15 | 江苏方天电力技术有限公司 | Steam turbine Roots-water ring vacuum pump frequency control extract system and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143090A (en) * | 2022-07-13 | 2022-10-04 | 西安热工研究院有限公司 | Method for determining performance of water ring vacuum pump of vacuum pumping system of thermal power generating unit |
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