CN112709284A - Water supply control method for centrifugal plant - Google Patents
Water supply control method for centrifugal plant Download PDFInfo
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- CN112709284A CN112709284A CN202011594061.7A CN202011594061A CN112709284A CN 112709284 A CN112709284 A CN 112709284A CN 202011594061 A CN202011594061 A CN 202011594061A CN 112709284 A CN112709284 A CN 112709284A
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- frequency
- control mode
- water supply
- control
- frequency conversion
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 41
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/02—Methods or layout of installations for water supply for public or like main supply for industrial use
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention belongs to the technical field of electrical automation, and particularly relates to a water supply control method for a centrifugal plant, which comprises the following steps: the method comprises the following steps: setting a main loop, wherein each water pump is provided with two operation loops; step two: a control system which is provided with two control modes; step three: and setting a frequency conversion automatic control mode, a frequency conversion manual control mode and a power frequency control mode. The operation frequency of the invention can be automatically adjusted according to the set parameters, the operation of the water pump can be automatically controlled by a program and can be manually controlled, the invention has the advantages of simple operation, high reliability, high automation degree and the like, and the safety and the stability of the water supply system of the centrifugal factory are greatly improved.
Description
Technical Field
The invention belongs to the technical field of electrical automation, and particularly relates to a water supply control method for a centrifugal plant.
Background
At present, the domestic and foreign water supply system has two modes of an automatic mode and a manual mode, the mode adopted in the automatic mode is frequency conversion constant pressure water supply generally, the output frequency of a frequency converter is adjusted in real time according to the change of the outlet pressure of a water pump, and then the rotating speed of the water pump is adjusted, and meanwhile, the increase or the decrease of the running water pump can be related, so that the outlet pressure of the water pump is basically equal to the set pressure. When the water consumption changes greatly, the variable-frequency constant-pressure water supply not only can play a role in regulating the pressure, but also can save water and electricity. The power frequency mode or the manual frequency conversion mode is adopted in the manual mode, the pressure of a pipe network cannot be automatically adjusted according to the water consumption condition, and the manual frequency conversion type pipe network pressure regulating device is an overhauling mode.
In the civil field, the water consumption difference between day and night is large, the variable-frequency constant-pressure water supply technology is used more, and the obtained effect is good. However, the water consumption condition of a centrifugal factory is analyzed, so that the production requirement can be met by one water pump, the increase and decrease of the water pump are not involved, the water consumption condition can be roughly divided into two time periods, and the operation requirement can be met by only two frequencies of the water pump. Meanwhile, due to the high dependence of a centrifugal plant on water, a water supply control system must have high reliability, and variable-frequency constant-pressure water supply is not the optimal choice due to the complex control, so that a control method needs to be improved in a targeted manner.
Therefore, it is desirable to provide a water supply control method for a centrifugal plant to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a water supply control method for a centrifugal plant, which is used for researching the typical working conditions of a water supply system of the centrifugal plant, improving the safety and stability of the water supply system and reducing the energy consumption.
The technical scheme for realizing the purpose of the invention is as follows:
a method for controlling water supply to a centrifugal plant, the method comprising the steps of:
the method comprises the following steps: setting a main loop, wherein each water pump is provided with two operation loops;
step two: a control system which is provided with two control modes;
step three: and setting a frequency conversion automatic control mode, a frequency conversion manual control mode and a power frequency control mode.
And in the step one, two operation loops comprise variable frequency operation and power frequency operation.
And in the second step, the two control modes comprise a frequency conversion control mode and a power frequency control mode, and the frequency conversion control mode and the power frequency control mode are mutually independent, so that the power frequency control system is still available when the frequency conversion control system fails.
In the second step, the variable frequency control mode takes the PLC as a core, and the touch screen is used as a display and operation interface to realize various functions, including two control modes of automatic variable frequency and manual variable frequency.
And in the third step, the automatic control mode of the variable frequency realizes the automatic cycle work of the three water pumps according to the set time through the PLC programming.
The three-step intermediate frequency conversion automatic control mode is set with time-division frequency conversion control, 9 to 17 points of Monday to Friday are set as a fixed frequency to operate, and other time is set as another fixed frequency to operate.
In the third step, the running frequency of the frequency converter can be independently set in a frequency conversion manual control mode, and the production water pump is started and stopped.
The invention has the beneficial technical effects that:
(1) the invention adopts the time-interval variable frequency control technology, theoretically, the power consumption is 0.512 times of 50Hz when the power supply works at 40Hz, and the power consumption can be greatly reduced.
(2) The operation frequency of the invention can be automatically adjusted according to the set parameters, the operation of the water pump can be automatically controlled by a program and can be manually controlled, the invention has the advantages of simple operation, high reliability, high automation degree and the like, and the safety and the stability of the water supply system of the centrifugal factory are greatly improved.
Drawings
FIG. 1 is a schematic diagram of a water supply control method for a centrifugal plant according to the present invention;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the present invention provides a water supply control method for a centrifugal plant, the method comprising the steps of:
the method comprises the following steps: setting a main loop, wherein each water pump is provided with two operation loops;
the two operation loops comprise frequency conversion operation and power frequency operation, the system flexibility is good, and electric energy can be saved.
Step two: a control system which is provided with two control modes;
in order to improve the safety and reliability of the system, two control modes are designed, namely a frequency conversion control mode and a power frequency control mode, wherein the frequency conversion control mode and the power frequency control mode are mutually independent, and the power frequency control system is still available when the frequency conversion control system fails.
The frequency conversion control mode takes the PLC as a core, the touch screen is used as a display and operation interface to realize various functions, and the frequency conversion control mode comprises two control modes of frequency conversion automation and frequency conversion manual operation, so that the flexibility of the system is greatly improved.
Step three: and setting modes of automatic frequency conversion control, manual frequency conversion control and power frequency control.
Frequency conversion automatic control mode:
and frequency conversion fault automatic switching is set, and the fault state of the frequency converter is detected through a PLC (programmable logic controller), so that the automatic switching of the three water pumps is realized.
The frequency conversion is automatically alternated to realize the automatic cycle work of the three water pumps according to the set time through the PLC programming, and the reasonable utilization of the equipment can be realized. In the frequency conversion automatic mode, when the alternation switch is on, the operation of the 3 production water pumps is automatically switched according to the set alternation time. However, if the control mode of a certain pump is at a manual or stop position, the frequency converter is skipped during circulation, and the next operation is directly switched to.
The time-sharing variable frequency control design sets the frequency from 9 to 17 points of Monday to Friday to be operated at a fixed frequency, and sets the frequency at other times to be operated at another fixed frequency. Not only meets the production requirement, but also realizes energy conservation.
Frequency conversion manual control mode:
the operation frequency of the frequency converter can be independently set in a frequency conversion manual control mode, and the production water pump can be started and stopped through a button on a panel of a production water pump frequency conversion control cabinet or an operation button between underground water pumps; when a start button is pressed, the production water pump starts to operate, and the operation indicator light is normally on; when the stop button is pressed, the production water pump stops running, and the running indicator light is turned off; and clicking a 'parameter setting' button on the touch screen to modify the manual working parameters.
A power frequency control mode;
under the condition that the system is powered on, a frequency conversion/power frequency selection switch on a power frequency control cabinet of the production water pump is switched to a power frequency position, the system enters a power frequency working mode, and the frequency conversion working mode is invalid under the power frequency working mode.
The production water pump can be started and stopped by a button on a panel of a power frequency control cabinet of the production water pump; when a start button is pressed, the domestic water pump starts to operate, and the operation indicator light is normally on; when the stop button is pressed down, the living water pump stops running, and the running indicator light is turned off.
According to the water supply characteristics of the centrifugal plant, multiple control modes are designed in a targeted manner, namely a variable-frequency automatic control mode, a variable-frequency manual control mode and a power frequency manual control mode, the variable-frequency automatic mode adjusts the frequency of the water pump by adopting a time-interval variable-frequency energy-saving technology, the variable-frequency mode and the power frequency mode are independent, the safety and the reliability are high, and uninterrupted continuous water supply of the centrifugal plant can be guaranteed. Meanwhile, based on the requirements of automation and energy conservation, the automatic switching and the regular automatic switching of the water pump faults are realized through PLC programming, and parameters such as working frequency, working frequency time, rest frequency time, alternate time, manual frequency conversion frequency and the like can be set according to actual operation requirements.
The present invention has been described in detail with reference to the drawings and examples, but the present invention is not limited to the examples, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention. The prior art can be adopted in the content which is not described in detail in the invention.
Claims (7)
1. A water supply control method for a centrifugal plant is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: setting a main loop, wherein each water pump is provided with two operation loops;
step two: a control system which is provided with two control modes;
step three: and setting a frequency conversion automatic control mode, a frequency conversion manual control mode and a power frequency control mode.
2. A centrifugal plant water supply control method according to claim 1, characterized in that: and in the step one, two operation loops comprise variable frequency operation and power frequency operation.
3. A centrifugal plant water supply control method according to claim 2, characterized in that: and in the second step, the two control modes comprise a frequency conversion control mode and a power frequency control mode, and the frequency conversion control mode and the power frequency control mode are mutually independent, so that the power frequency control system is still available when the frequency conversion control system fails.
4. A centrifugal plant water supply control method according to claim 3, characterized in that: in the second step, the variable frequency control mode takes the PLC as a core, and the touch screen is used as a display and operation interface to realize various functions, including two control modes of automatic variable frequency and manual variable frequency.
5. A centrifugal plant water supply control method according to claim 4, characterized in that: and in the third step, the automatic control mode of the variable frequency realizes the automatic cycle work of the three water pumps according to the set time through the PLC programming.
6. A centrifugal plant water supply control method according to claim 5, characterized in that: the three-step intermediate frequency conversion automatic control mode is set with time-division frequency conversion control, 9 to 17 points of Monday to Friday are set as a fixed frequency to operate, and other time is set as another fixed frequency to operate.
7. A centrifugal plant water supply control method according to claim 6, characterized in that: in the third step, the running frequency of the frequency converter can be independently set in a frequency conversion manual control mode, and the production water pump is started and stopped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011594061.7A CN112709284A (en) | 2020-12-29 | 2020-12-29 | Water supply control method for centrifugal plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011594061.7A CN112709284A (en) | 2020-12-29 | 2020-12-29 | Water supply control method for centrifugal plant |
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| CN112709284A true CN112709284A (en) | 2021-04-27 |
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| CN202011594061.7A Pending CN112709284A (en) | 2020-12-29 | 2020-12-29 | Water supply control method for centrifugal plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326633A (en) * | 2021-12-31 | 2022-04-12 | 四川红华实业有限公司 | Automatic control method for feeding process |
Citations (6)
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|---|---|---|---|---|
| CN201347566Y (en) * | 2008-12-18 | 2009-11-18 | 广州市高级技工学校 | Variable frequency constant-pressure water-supplying automatic control system |
| JP2010275688A (en) * | 2009-05-26 | 2010-12-09 | Sayama Seisakusho:Kk | Boost water supply system for high-rise building |
| CN104196088A (en) * | 2014-09-09 | 2014-12-10 | 江南大学 | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof |
| CN105507378A (en) * | 2016-01-15 | 2016-04-20 | 昆明理工大学 | Frequency-conversion-type automatic constant-pressure water supplying system and method |
| CN205636918U (en) * | 2016-05-17 | 2016-10-12 | 江苏建筑职业技术学院 | Multicomputer constant pressure water supply frequency conversion control system based on PLC |
| CN206800507U (en) * | 2017-06-09 | 2017-12-26 | 上海煤科实业有限公司 | Constant pressure water supply system |
-
2020
- 2020-12-29 CN CN202011594061.7A patent/CN112709284A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201347566Y (en) * | 2008-12-18 | 2009-11-18 | 广州市高级技工学校 | Variable frequency constant-pressure water-supplying automatic control system |
| JP2010275688A (en) * | 2009-05-26 | 2010-12-09 | Sayama Seisakusho:Kk | Boost water supply system for high-rise building |
| CN104196088A (en) * | 2014-09-09 | 2014-12-10 | 江南大学 | Frequency conversion speed regulation and constant pressure pipe network water supply system and control method thereof |
| CN105507378A (en) * | 2016-01-15 | 2016-04-20 | 昆明理工大学 | Frequency-conversion-type automatic constant-pressure water supplying system and method |
| CN205636918U (en) * | 2016-05-17 | 2016-10-12 | 江苏建筑职业技术学院 | Multicomputer constant pressure water supply frequency conversion control system based on PLC |
| CN206800507U (en) * | 2017-06-09 | 2017-12-26 | 上海煤科实业有限公司 | Constant pressure water supply system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114326633A (en) * | 2021-12-31 | 2022-04-12 | 四川红华实业有限公司 | Automatic control method for feeding process |
| CN114326633B (en) * | 2021-12-31 | 2024-04-09 | 四川红华实业有限公司 | Automatic control method for feeding process |
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Application publication date: 20210427 |