CN102588259A - Frequency conversion and constant voltage control device of air compressor unit for cement plant - Google Patents
Frequency conversion and constant voltage control device of air compressor unit for cement plant Download PDFInfo
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- CN102588259A CN102588259A CN2012100513677A CN201210051367A CN102588259A CN 102588259 A CN102588259 A CN 102588259A CN 2012100513677 A CN2012100513677 A CN 2012100513677A CN 201210051367 A CN201210051367 A CN 201210051367A CN 102588259 A CN102588259 A CN 102588259A
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Abstract
The invention discloses a frequency conversion and constant voltage control device of an air compressor unit for a cement plant. The device is composed of a PLC (programmable logic controller) controller, a frequency converter, a pressure transmitter, a low voltage electric equipment and an air compressor. The device is characterized in that the frequency converter in a main loop works in a one-to-many way, namely, one dynamic loop of each air compressor motor is divided into two paths. One path is connected with a power supply bus by a switch and the frequency converter while the other path is directly connected with the power supply bus by a switch. The output nodes of the PLC controller are connected with the control coils of the two switches respectively. The automatic switching, and the automatic changeover between the power frequency running and the frequency conversion running of the air compressor motor are realized by switching on and switching off the control coils. Therefore, the problems that the traditional air compressor cannot be continuously adjusted according to load weight, and the problems of high energy consumption, low work efficiency and difficulty in guaranteeing pipeline pressure are solved.
Description
Technical field
The present invention relates to a kind of cement plant pneumatics unit frequency-changing pressure stabilizing control gear, this device is realized the constant voltage speed regulating control of pneumatics unit motor through computer controlled system.
Background technique
Cement production line is provided with a plurality of air compressor plants group according to state of arts; Interval for guaranteeing output pipeline pressure at nominal situation; Normally the load clutch of the control of the upper and lower bit switch through pipeline pressure air compressor plant group or several motors realizes that pressure is interval in normal industry control.This control mode can not be adjusted according to the weight of load continuously, and air compressor motor underloading ratio in service is very high, thereby causes energy consumption of electrical machinery big, and working efficiency is low, and pipeline pressure also is difficult to keep stable simultaneously.
Summary of the invention
In order to reduce the energy consumption of motor; Improve the working efficiency of motor; And guarantee the stable of pipeline pressure, and the present invention provides a kind of pneumatics unit frequency-changing pressure stabilizing energy saving device, and this device adopts the automatic switching mode to realize a Frequency Converter Control multiple air compressors motor; And, accomplish the speed governing of air compressor motor through constant voltage closed loop control setting frequency converter frequency.
The technological scheme that the present invention adopted is: this device is by the PLC controller, frequency variator, and pressure transmitter, low voltage electrical equipment and air compressor are formed.Frequency variator adopts the frequency variator that possesses the automatic energy-optimised function of AEO, and this type of frequency variator can be adjusted the voltage-frequency ratio of frequency variator output automatically according to motor load, and energy-saving effect exceeds 3-10% than general frequency variator.Major loop adopts one to drag many modes; A power loop of every air compressor motor all is divided into two-way; Leading up to switch and frequency variator is connected to bus, and another road directly links to each other with bus through switch, and the output node of PLC controller is connected to the control coil of these two switches respectively; Through switching on and off control coil, realize automatic switching and the power frequency and the converting operation automatic switchover of air compressor motor.
The constant control of pipeline pressure is accomplished by the constant voltage pid control circuit of PLC controller indoor design, and the pressure feedback value that pid control circuit detects through the pressure transmitter that relatively is installed on the gas holder and the force value of setting provide the frequency setting value of frequency variator.
For the automatic switching of realizing every air compressor motor and the conversion of power frequency and converting operation; In the PLC indoor design two kinds of control modes are a kind of is fixing frequency conversion air compressor control mode, another kind ofly be circulation frequency conversion air compressor control mode, the while has been designed the operation time device for every air compressor in PLC; Write down its working time; And according to every compressor operation time, choose reasonable needs the air compressor of switching, with the extent of deterioration of each air compressor of active balance.
Fixing frequency conversion air compressor control mode: fixing wherein one be the frequency conversion air compressor, and accomplish speed governing through the constant voltage pid control circuit.All the other air compressors all operate under the power frequency mode and through the PLC controller according to variation in pressure and realize automatic switching working time.
Circulation frequency conversion air compressor control mode: this mode realizes the frequency conversion loop control, no longer includes fixing frequency conversion air compressor in the control.At first start the longest air compressor dead time during startup, and regulate rotating speed, if pressure satisfies then keeps this method of operation by constant voltage PID regulator by PLC control frequency variator; If after transferring to maximum (top) speed; Pressure is still not enough, then with this air compressor incision power frequency operation, is started by next air compressor of Frequency Converter Control (this air compressor dead time be only second to a last motor) simultaneously; And the adjusting rotating speed, so circulation is satisfied setting value until pressure; When setting pressure descends, then regulate that motor speed of converting operation, if be adjusted to when minimum; Pressure is still greater than setting value; Then stop the longest motor of power frequency operation time immediately, simultaneously self rotating speed is transferred to maximum, if pressure is still greater than given; Then transfer slow self rotating speed, so circulation is satisfied setting value until pressure.
The invention has the beneficial effects as follows, can improve the working efficiency of air compressor greatly, cut down the consumption of energy, increase the service life, also effectively reduce the fluctuation of pipeline pressure simultaneously.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
A major loop figure of the pneumatics unit frequency-changing pressure stabilizing energy saving device that Fig. 1 has represented to be made up of three air compressor motors.
QF1 to QF4 is a circuit breaker among the figure, and KM1 to KM6 is the contactor main contact, and FR is a thermorelay, and SV is a frequency variator, and M1 to M3 is an air compressor motor.
Fig. 2 has represented the automatic control loop figure of this device, and 1 is expressed as PLC, and 2 are expressed as frequency variator, and 3 are expressed as at gas holder pipeline exit setting pressure transmitter, and 4 are expressed as gas holder, and KM1 to KM6 representes contactor coil and main contact thereof.
Fig. 3 is a constant voltage PID regulator.
Embodiment
In Fig. 1, frequency variator is connected to bus through circuit breaker Q F1, and KM1 is passed through in frequency variator output respectively, KM3, and KM5 is connected to
Air compressor motor M1 to M3 realizes the control of a frequency variator to multiple electric motors; Air compressor motor M1 to M3 passes through KM2 respectively, QF2, KM4, and QF3, KM6, QF4 is connected directly to bus, realizes power frequency operation.
Shown in Figure 2 is this device automatic control loop, realizes that fixedly the frequency conversion air compressor is controlled and the control of circulation frequency conversion air compressor.When selecting fixedly frequency conversion air compressor control mode, can preset a certain air compressor motor and be fixing VFC, be fixing VFC as air compressor 1 is set here; The control implementation process is following: PLC sends instruction adhesive KM1 during startup, and starts frequency variator, is regulated the rotating speed of air compressor 1 by constant voltage PID regulator; Along with if the rotating speed pressure that rises satisfies then keeps this method of operation; If transfer to the maximum (top) speed successor so less than setting pressure, PLC sends instruction adhesive KM4, lets air compressor 2 get into power frequency operation (it is the longest 2 dead times to establish air compressor); Regulate the rotating speed of Frequency Converter Control air compressor 1 simultaneously; If pressure is still less than setting value, then adhesive KM6 drops into and lets air compressor 3, satisfies condition until pressure; If setting pressure, is at first transferred air compressor 1 rotating speed less than feedback pressure, if speed drop does not still satisfy to minimum; PLC sends instruction and breaks off KM4, stops air compressor 2 (air compressor 2 operations are the longest), and regulates air compressor 1 rotating speed; If satisfy then keep this method of operation along with rotating speed reduces pressure; If speed drop does not still satisfy to minimum, PLC sends instruction and breaks off KM6, satisfies condition until pressure.
Circulation frequency conversion air compressor control implementation process is following: KM1 is the longest dead time in supposition, and PLC sends instruction adhesive KM1 during startup, and starts frequency variator; Regulate the rotating speed of air compressor 1 by constant voltage PID regulator, if along with the rotating speed pressure that rises satisfies then keeps this method of operation, if transfer to behind the maximum (top) speed still less than setting pressure; PLC sends instruction and breaks off KM1 and adhesive KM2, stops frequency converter frequency output, lets air compressor 1 change the power frequency operation mode over to; Adhesive KM3 then, air compressor 2 gets into converting operation attitudes (it is the longest 2 dead times to establish air compressor), regulates air compressor 2 rotating speeds by constant voltage PID regulator; If pressure is still less than setting value then change air compressor 2 over to the power frequency operation attitude; With air compressor 3 incision converting operation attitudes, handoff procedure is the same, satisfies condition until pressure simultaneously;
If setting pressure is less than feedback pressure, and air compressor 3 entering converting operation attitudes, at first regulate air compressor 3, if speed drop does not still satisfy to minimum; Then break off KM2, stop air compressor 1, regulate air compressor 3 rotating speeds simultaneously to maximum, if pressure is still greater than given; Then transfer slow self rotating speed, if setting pressure still less than feedback pressure, is then broken off KM4; Stop air compressor 2, and repeat said process, satisfy condition until pressure.
Fig. 3 is a constant voltage PID regulator, and this is a reverse feedback control, and the PID regulator is according to the difference of setting pressure and feedback pressure, and through calculating output frequency converter frequency value, the control rotating speed is realized constant voltage control.
Claims (3)
1. cement plant pneumatics unit frequency-changing pressure stabilizing control gear, this installs by PLC controller, frequency variator; Pressure transmitter; Low voltage electrical equipment and air compressor are formed, and it is characterized in that: the major loop frequency variator adopts one to drag many modes, and promptly every air compressor motor power loop all is divided into two-way; Leading up to switch, frequency variator is connected to power source bus, and another road is connected directly to power source bus through switch; The output node of PLC controller is connected to the control coil of these two switches respectively, through switching on and off control coil, realizes automatic switching and the power frequency and the converting operation automatic switchover of air compressor motor.
2. cement plant according to claim 1 pneumatics unit frequency-changing pressure stabilizing control gear, it is characterized in that: every motor of pneumatics unit all is connected to frequency variator through switch.
3. cement plant according to claim 1 pneumatics unit frequency-changing pressure stabilizing control gear is characterized in that: install pressure transmitter on the gas holder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100513677A CN102588259A (en) | 2012-03-01 | 2012-03-01 | Frequency conversion and constant voltage control device of air compressor unit for cement plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100513677A CN102588259A (en) | 2012-03-01 | 2012-03-01 | Frequency conversion and constant voltage control device of air compressor unit for cement plant |
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| CN102588259A true CN102588259A (en) | 2012-07-18 |
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| CN2012100513677A Pending CN102588259A (en) | 2012-03-01 | 2012-03-01 | Frequency conversion and constant voltage control device of air compressor unit for cement plant |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104774985A (en) * | 2015-01-30 | 2015-07-15 | 山东钢铁股份有限公司 | Blast furnace coal injection inflating assembly constant-pressure stable running method |
| CN105937492A (en) * | 2015-10-16 | 2016-09-14 | 江苏兴达钢帘线股份有限公司 | Automatic constant-pressure control device of air compressor |
| EP2956341B1 (en) | 2013-02-14 | 2016-11-30 | KNORR-BREMSE Systeme für Schienenfahrzeuge GmbH | Air supply system with electronic converter |
| CN106593816A (en) * | 2017-02-06 | 2017-04-26 | 荣成市固废综合处理与应用产业园有限公司 | Variable frequency one-drive-two compressed air system for air compressor |
| CN112783224A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Pressure maintaining system adopting variable-frequency pressure maintaining equipment and self-adaptive control method |
-
2012
- 2012-03-01 CN CN2012100513677A patent/CN102588259A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2956341B1 (en) | 2013-02-14 | 2016-11-30 | KNORR-BREMSE Systeme für Schienenfahrzeuge GmbH | Air supply system with electronic converter |
| EP2956341B2 (en) † | 2013-02-14 | 2020-08-12 | KNORR-BREMSE Systeme für Schienenfahrzeuge GmbH | Air supply system with electronic converter |
| US11300117B2 (en) | 2013-02-14 | 2022-04-12 | Knorr-Bremse Systeme für Schienenfahrzeuge GmbH | Air supply system with electronic converter |
| CN104774985A (en) * | 2015-01-30 | 2015-07-15 | 山东钢铁股份有限公司 | Blast furnace coal injection inflating assembly constant-pressure stable running method |
| CN105937492A (en) * | 2015-10-16 | 2016-09-14 | 江苏兴达钢帘线股份有限公司 | Automatic constant-pressure control device of air compressor |
| CN106593816A (en) * | 2017-02-06 | 2017-04-26 | 荣成市固废综合处理与应用产业园有限公司 | Variable frequency one-drive-two compressed air system for air compressor |
| CN112783224A (en) * | 2020-12-30 | 2021-05-11 | 中国长江电力股份有限公司 | Pressure maintaining system adopting variable-frequency pressure maintaining equipment and self-adaptive control method |
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Application publication date: 20120718 |