CN106704211A - Frequency change and energy conservation system of thermal power plant electric water feeding pump - Google Patents
Frequency change and energy conservation system of thermal power plant electric water feeding pump Download PDFInfo
- Publication number
- CN106704211A CN106704211A CN201510790437.4A CN201510790437A CN106704211A CN 106704211 A CN106704211 A CN 106704211A CN 201510790437 A CN201510790437 A CN 201510790437A CN 106704211 A CN106704211 A CN 106704211A
- Authority
- CN
- China
- Prior art keywords
- frequency converter
- motor
- pump
- feed pump
- power plant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a frequency change and energy conservation system of a thermal power plant electric water feeding pump. The system comprises a switching cabinet, a frequency converter, a motor, a gear box, a water feeding pump and a system controller; the system controller issues an output parameter instruction to the frequency converter; the switching cabinet provides an input power supply to the frequency converter; the frequency converter drives the motor to operate; the motor drives the gear box to rotate through a rotor shaft; and the gear box reduces the rotating speed to a proper ratio, and conveys to the water feeding pump so as to adjust the water supply quantity of the water feeding pump. The system can improve the operation efficiency of the water feeding pump and the adjusting precision of supplying water to a boiler under different load change conditions, reduces the power consumption, and prolongs the service life of the motor.
Description
Technical field
The invention belongs to field of energy-saving technology, in particular it relates to a kind of thermal power plant's electrically driven feed pump frequency conversion section
Can system.
Background technology
Thermal power plant needs to have uniform temperature in oxygen-eliminating device storage tank by feed pump in operation, removes
The feedwater of peroxide is conveyed to boiler, to meet boiler feed water the need for.Current Power Plant Feedwater pumping system
It is made up of interconnected cage motor, fluid coupling and feed pump, in load variations, by adjusting fluid power
The scoop tube aperture of coupler changes the running speed of feed pump, so as to control to be supplied to the current of boiler
Amount, but the efficiency of fluid coupling is with rotating speed into once linear relationship, with the decline of rotating speed, effect
Rate can also be reduced, and cause the power consumption of water pump higher.
Since frequency converter came out from 1964, the experience development of more than 40 years, in European and American developed countries
Be widely used, at present China air-conditioning, elevator, metallurgy, machinery, electronics, petrochemical industry, papermaking,
The industries such as weaving are also carrying out application.Frequency control in tuning range, static accuracy, dynamic quality,
System effectiveness, perfect defencive function, easily realize that it is liquid to automatically control with the aspects such as process control
Mechanical couple speed governing is incomparable, and it has been the most preferable most promising tune of generally acknowledged ac motor
Fast scheme, represents the developing direction of Electrified Transmission from now on.
The content of the invention
The present invention overcomes the shortcomings of that prior art is present, and technical problem to be solved is：There is provided a kind of
Thermal power plant's electrically driven feed pump frequency conversion energy-saving system.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of thermal power plant is electronic
Feed pump frequency conversion energy-saving system, including switch cubicle, frequency converter, motor, gear-box, feed pump,
System controller.
The frequency converter is made up of rectifier and inverter two parts, and rectifier is using high-voltage diode unit
Part, inverter uses IGBT elements；The frequency converter is using with unit bypass function, power list
Unit uses center point drift control technology；The frequency converter uses vector control technology, cooling by water side
Formula, soft start can be carried out to motor and soft stop stops control.
The motor uses asynchronous motor, and its stator load voltage value is not less than frequency converter output
Magnitude of voltage.
, using DRUHIT Turbo series, gear up ratio is by motor speed for the gear-box
Determine with speed of feedwater.
The feed pump is made up of main pump and fore pump, and main pump uses horizontal multi-stage centrifugal pump, fore pump
Using horizontal single-stage double suction centrifugal pump.
The system controller is made up of PLC elements, with being capable of automatic detection and calculated load amount
Size and the in good time function of adjustment frequency converter, motor and feed pump operation curve.
The present invention has an advantageous effect in that compared with prior art：
First, the present invention can be improved under different load situation of change, especially in the underload at night
In the case of feed pump efficiency, overcome that former to adjust brought efficiency by fluid coupling relatively low and consume
The big defect of electricity.
2nd, the present invention can improve the degree of regulation to boiler water supply, and using soft start and stop skill
Art, can extend motor service life, be thrown switch phenomenon at a high speed without stoste mechanical couple.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
Specific embodiment
As shown in figure 1, a kind of thermal power plant's electrically driven feed pump frequency conversion energy-saving system of the invention, including switch
Cabinet, frequency converter, motor, gear-box, feed pump, system controller；Above-mentioned switch cubicle is by electricity
Cable is connected with the three-phase input end of frequency converter, and the output of frequency converter arrives motor by cable connection
Stator input, motor is connected by rotor of output shaft axle with gear-box, the gear output shaft of gear-box
Connected with the armature spindle of feed pump；The controller of above-mentioned frequency converter passes through controlling cable homologous ray controller
Connection.
The frequency converter is made up of rectifier and inverter two parts, and rectifier is using high-voltage diode unit
Part, inverter uses IGBT elements；The frequency converter is using with unit bypass function, power list
Unit uses center point drift control technology；The frequency converter uses vector control technology, with to motor
Carry out soft start and soft stop only control function, cooling by water mode.
The motor uses asynchronous motor, and its stator load voltage value is not less than frequency converter output
Magnitude of voltage.
, using DRUHIT Turbo series, gear up ratio is by motor speed for the gear-box
Determine with speed of feedwater.
The feed pump is made up of main pump and fore pump, and main pump uses horizontal multi-stage centrifugal pump, fore pump
Using horizontal single-stage double suction centrifugal pump.
The system controller is made up of PLC elements, with being capable of automatic detection and calculated load amount
Size and the in good time function of adjustment frequency converter, motor and feed pump operation curve.
The course of work of this example：Above-mentioned all parts substantially one thermal power plant's electrically driven feed pump of composition
Frequency conversion energy-saving system, under normal circumstances, system controller issues output order to frequency converter, switch
Cabinet provides input power to frequency converter, and by transducer drive motor running, motor passes through armature spindle
Gear-box rotation is driven, rotating speed is reduced to suitable ratio by gear-box, and is sent to feed pump, from
And adjust the output of feed pump.
Advantages of the present invention：The present invention can be improved under different load situation of change, especially at night
Between underload in the case of feed pump efficiency, overcome the former effect brought by fluid coupling regulation
Rate is relatively low and the big defect of power consumption；The degree of regulation to boiler water supply can be improved, and is opened using soft
It is dynamic and stop technology, motor service life can be extended, thrown switch at a high speed phenomenon without stoste mechanical couple.
It is finally it should be noted that above content is merely illustrative of the technical solution of the present invention rather than right
The limitation of the scope of the present invention, one of ordinary skill in the art is carried out to technical scheme
Simple modification or equivalent, all without departing from the spirit and scope of technical solution of the present invention.
Claims (5)
1. a kind of thermal power plant's electrically driven feed pump frequency conversion energy-saving system, it is characterised in that：Including switch cubicle,
Frequency converter, motor, gear-box, feed pump, system controller；Above-mentioned switch cubicle passes through cable
Connected with the three-phase input end of frequency converter, the output of frequency converter passes through cable connection to the stator of motor
Input, motor is connected by rotor of output shaft axle with gear-box, and the gear output shaft of gear-box is same to be given
The armature spindle of water pump is connected；The controller of above-mentioned frequency converter is connected by controlling cable homologous ray controller
Connect.
2. a kind of thermal power plant's electrically driven feed pump frequency conversion energy-saving system according to claim 1, its
It is characterised by：The frequency converter is made up of rectifier and inverter two parts, and rectifier uses high pressure two
Pole pipe element, inverter uses IGBT elements；The frequency converter is used has unit bypass function,
Power cell uses center point drift control technology；The frequency converter uses vector control technology, has
Soft start and soft stop only control function, cooling by water mode are carried out to motor.
3. a kind of switchgear house intelligent data acquisition management system according to claim 1, it is special
Levy and be：The system controller is made up of PLC elements, with being capable of automatic detection and calculated load
The size of amount and the in good time function of adjustment frequency converter, motor and feed pump operation curve.
4. a kind of thermal power plant's electrically driven feed pump frequency conversion energy-saving system according to claim 1, its
It is characterised by：, using DRUHIT Turbo series, gear up ratio is by motor for the gear-box
Rotating speed and speed of feedwater determine.
5. a kind of thermal power plant's electrically driven feed pump frequency conversion energy-saving system according to claim 1, its
It is characterised by：The feed pump is made up of main pump and fore pump, and main pump uses horizontal multi-stage centrifugal pump,
Fore pump uses horizontal single-stage double suction centrifugal pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790437.4A CN106704211A (en) | 2015-11-18 | 2015-11-18 | Frequency change and energy conservation system of thermal power plant electric water feeding pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510790437.4A CN106704211A (en) | 2015-11-18 | 2015-11-18 | Frequency change and energy conservation system of thermal power plant electric water feeding pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106704211A true CN106704211A (en) | 2017-05-24 |
Family
ID=58932096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510790437.4A Pending CN106704211A (en) | 2015-11-18 | 2015-11-18 | Frequency change and energy conservation system of thermal power plant electric water feeding pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106704211A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5234319A (en) * | 1992-05-04 | 1993-08-10 | Wilder Richard W | Sump pump drive system |
| CN2898630Y (en) * | 2006-04-22 | 2007-05-09 | 陆磊 | Automatic energy-saving control system of mini-medium fired-coal chain boiler |
| CN202991531U (en) * | 2012-09-29 | 2013-06-12 | 张文海 | Power frequency conversion switchover type fluid coupling electrically driven feed pump energy-saving system |
| CN203584761U (en) * | 2013-11-30 | 2014-05-07 | 广州智光节能有限公司 | Electric water feeding pump system with frequency-conversion speed regulation of gearbox |
| CN104993457A (en) * | 2015-07-21 | 2015-10-21 | 大唐三门峡发电有限责任公司 | Thermal power plant high-voltage variable frequency motor protection system |
| CN205117755U (en) * | 2015-11-18 | 2016-03-30 | 亿海天成(北京)科技有限公司 | Electronic pump variable frequency economizer system that gives of thermal power plant |
-
2015
- 2015-11-18 CN CN201510790437.4A patent/CN106704211A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5234319A (en) * | 1992-05-04 | 1993-08-10 | Wilder Richard W | Sump pump drive system |
| CN2898630Y (en) * | 2006-04-22 | 2007-05-09 | 陆磊 | Automatic energy-saving control system of mini-medium fired-coal chain boiler |
| CN202991531U (en) * | 2012-09-29 | 2013-06-12 | 张文海 | Power frequency conversion switchover type fluid coupling electrically driven feed pump energy-saving system |
| CN203584761U (en) * | 2013-11-30 | 2014-05-07 | 广州智光节能有限公司 | Electric water feeding pump system with frequency-conversion speed regulation of gearbox |
| CN104993457A (en) * | 2015-07-21 | 2015-10-21 | 大唐三门峡发电有限责任公司 | Thermal power plant high-voltage variable frequency motor protection system |
| CN205117755U (en) * | 2015-11-18 | 2016-03-30 | 亿海天成(北京)科技有限公司 | Electronic pump variable frequency economizer system that gives of thermal power plant |
Non-Patent Citations (1)
| Title |
|---|
| 蔡猛等: "高压变频器中性点漂移技术的研究", 《万方数据》 * |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170524 |
|
| WD01 | Invention patent application deemed withdrawn after publication |