CN203223404U - Frequency converting control system of supercritical unit induced draft fan - Google Patents
Frequency converting control system of supercritical unit induced draft fan Download PDFInfo
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- CN203223404U CN203223404U CN 201320229603 CN201320229603U CN203223404U CN 203223404 U CN203223404 U CN 203223404U CN 201320229603 CN201320229603 CN 201320229603 CN 201320229603 U CN201320229603 U CN 201320229603U CN 203223404 U CN203223404 U CN 203223404U
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Abstract
The utility model provides a frequency converting control system of a supercritical unit induced draft fan. The frequency converting control system of the supercritical unit induced draft fan comprises an induced draft fan power switch QF, a frequency converter input side high-voltage power switch QF1, a frequency converter output side high-voltage power switch QF2, a frequency converter bypass high-voltage power switch QF3, a frequency converter and a distributed control system, wherein the switches QF, QF1 and QF2 and the frequency converter are connected in series, the switch QF3 is connected with a series-connection circuit of the switch QF1, the switch QF2 and the frequency converter in parallel, and the distributed control system is respectively in electric connection with the switches QF, QF1, QF2 and QF3 and controls the switching on-off states of the switches. The frequency converting control system of the induced draft fan can realize frequency conversion of the induced draft fan to automatically control the pressure of a hearth, effectively lower the energy consumption when the induced draft fan operates, controls the pressure of the hearth through the rotation speed of the induced draft fan, can guarantee the accuracy, rapidness and stability of control over the pressure of the hearth under a frequency-conversion operating mode, and improves the anti-jamming capability of control over the pressure of the hearth.
Description
Technical field
The utility model relates to the frequency conversion control technique field, refers to a kind of supercritical unit induced draught fan frequency-changing control system especially.
Background technique
Along with progressively going deep into of energy-saving and emission-reduction work, build the focus that economical and environment-friendly enterprise becomes the thermal power plant just day by day.In the energy-saving and emission-reduction project of power station, the frequency variator transformation of high-voltage motor equipment, obvious because of its energy-saving effect, obtain promotion and application rapidly.
Induced draught fan is one of important high-voltage motor of thermal power plant, and its operation regulative mode is normally regulated air quantity by regulating the stator blade aperture, and a large amount of power consumptions are in restriction loss.At present, power plant's induced draught fan mainly adopts the power frequency control mode, and mainly there is following problem in this control mode:
1, power plant's induced draught fan power frequency control mode is by stator blade actuating mechanism controls air inducing amount, when unit load changes, the air output of boiler, air inducing amount change thereupon, the induced draught fan angle of adjusting the stator blade by changing blower fan of exerting oneself is regulated, restriction loss is very big, and particularly restriction loss is bigger during low-load.
2, stator blade is adjusted slow movement, and is slow with desulfurization booster fan system speed of response when the varying duty adjustment process, causes system oscillation, load responding sluggishness etc. easily.
3, asynchronous motor inrush current when starting generally reaches 6～8 times of motor rated current, station service is formed impact, and influence the stabilization of power grids, simultaneously the very big adverse effect of existence in the working life of impact torque and blower fan formidably.
In same system, do not carry out during 4, because of booster fan and induced draught fan adjustment, furnace pressure control can't be flourishing to effect preferably, the disturbance rejection ability is relatively poor, causes that easily the desulfurization side opens by-pass damper greatly because of pressure surge, cause desulfurization out of service, have a strong impact on environment protection digital.
The model utility content
The utility model provides a kind of supercritical unit induced draught fan frequency-changing control system, be used for solving the very big and bad problem of control effect of prior art induced draught fan control mode restriction loss, the induced draught fan frequency-changing control system that the utility model provides can be realized induced draught fan rotating speed random group load variations and adjust, raise the efficiency, and reduce unit energy consumption and station service power consumption rate effectively, simultaneously by induced draught fan rotating speed control furnace pressure, and controller parameter is optimized, so just can guarantee under the converting operation mode, the accuracy of furnace pressure control, rapidity and stability improve the antijamming capability of furnace pressure control.
The utility model provides a kind of supercritical unit induced draught fan frequency-changing control system, comprise the fan power switch, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch, frequency variator and decentralized control system; Described fan power switch, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator series connection; Described frequency variator bypass high-voltage electric switch is in parallel with the series circuit of described frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch and frequency variator; Described decentralized control system is electrically connected respectively with described fan power switch, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch, is used for the folding condition of the described fan power switch of control, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch and frequency variator.
Preferably, in the above-mentioned supercritical unit induced draught fan frequency-changing control system, described system is the frequency conversion mode during control induced draught fan starting up, and described decentralized control system is controlled described fan power switch, frequency variator input side high-voltage electric switch and output side transducer high-voltage electric switch and all is in "on" position under the described frequency conversion mode.
When described system was in the power frequency mode, described decentralized control system was controlled described frequency variator input side high-voltage electric switch and the output side transducer high-voltage electric switch is in off state, and described frequency variator bypass high-voltage electric switch is in "on" position.
The supercritical unit induced draught fan frequency-changing control system that the utility model provides has following beneficial effect:
1, by cancellation desulfurization booster fan, induced draught fan dilatation, frequency conversion transformation adopt the induced draught fan of the unit of this induced draught fan frequency-changing control system to adopt the converting operation mode, and the stator blade standard-sized sheet significantly reduces the stator blade restriction loss, lowers the induced draught fan energy consumption, reduces station service power consumption rate.
2, during converting operation, the stator blade standard-sized sheet is by rotating speed control furnace pressure, controller parameter is optimized to be adjusted, guarantee under the converting operation mode that furnace pressure control more accurately and fast, stable, load responding accelerates, and improved the antijamming capability of furnace pressure control.And the furnace pressure control system adopts two cover control schemes, and design induced draught fan frequency conversion cut is controlled frequently, guarantees that induced draught fan frequency conversion, power frequency dual mode all can move, and the frequency conversion that can steadily carry out switches to the power frequency mode.
3, during the induced draught fan VFC, utilize variable frequency starting, rotating speed is lower, and inrush current is less, solves to the station service shock problem working life of improving blower fan greatly simultaneously.
4, after the booster fan cancellation, former by-pass damper is by shutoff, and the situation that does not exist by-pass damper to open by mistake guarantees that desulfurization drops into, and guarantees that environment protection digital is normal.
5, can realize all switches in the frequency-changing control system of DCS and the whole process control function of frequency variator; The induced draught fan frequency conversion is cut to the power frequency control logic, and when realizing the frequency conversion fault trip, induced draught fan is cut automatically to power frequency operation.
Description of drawings
The supercritical unit induced draught fan frequency-changing control system schematic representation that Fig. 1 provides for the utility model embodiment;
The supercritical unit induced draught fan frequency-changing control system workflow schematic representation that Fig. 2 provides for the utility model embodiment;
Fig. 3 is load and stator blade aperture corresponding relation figure.
Embodiment
Because induced draught fan often is under the lower efficient operating mode and moves in the prior art, the stator blade aperture is less than 50%, therefore the utility model carries out the frequency conversion transformation to induced draught fan, adjust to realize induced draught fan rotating speed random group load variations, thereby improve induced draught fan efficient, reduce unit energy consumption and station service power consumption rate greatly.Meanwhile, realize decentralized control system (Distributed Control Systems, DCS) control of high voltage frequency conversion equipment.For making the technical problems to be solved in the utility model, technological scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
As shown in Figure 1, a kind of supercritical unit induced draught fan frequency-changing control system that embodiment of the present utility model provides, comprise fan power switch QF, frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, frequency variator bypass high-voltage electric switch QF3, frequency variator 1 and decentralized control system (not shown in figure 1), described frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, frequency variator 1 series connection; Described frequency variator bypass high-voltage electric switch QF3 and frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, frequency variator 1 series circuit parallel connection; Circuit after described fan power switch QF and frequency variator bypass high-voltage electric switch QF3 and frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, the frequency variator 1 series circuit parallel connection is connected; Described decentralized control system is used for control fan power switch QF, frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, frequency variator bypass high-voltage electric switch QF3, the folding condition of frequency variator 1.
A kind of supercritical unit induced draught fan frequency-changing control system that the utility model provides can work in frequency conversion mode or power frequency mode, and between freely switches.
This control system at first starts the frequency conversion mode when induced draught fan starts.Make things convenient for mode to be specially: QF closes with the fan power switch, and then frequency variator 1 outlet side high-voltage switch power supply output side transducer high-voltage electric switch QF2 satisfies startup enabled condition, starts output side transducer high-voltage electric switch QF2; After output side transducer high-voltage electric switch QF2 closes a floodgate, output side transducer high-voltage electric switch QF1 satisfies startup enabled condition, then start frequency variator input side high-voltage electric switch QF1, frequency variator bypass this moment high-voltage electric switch frequency variator bypass high-voltage electric switch QF3 is at sub-gate position, and do not have combined floodgate enabled condition (preventing frequency variator bypass high-voltage electric switch QF3 false switching).Frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2 all in the closing position and frequency variator bypass high-voltage electric switch QF3 at sub-gate position, synthesize " converting operation mode ", issue operation person CRT picture.
Need set automatic control parameter during frequency conversion, control furnace pressure to pass through the induced draught fan rotating speed, and controller parameter is optimized, so just can guarantee under the converting operation mode, accuracy, rapidity and the stability of furnace pressure control improve the antijamming capability of furnace pressure control.
When the tripping operation of one-sided induced draught fan frequency variator need automatically switch to the operating mode of power frequency operation in the unit normal course of operation, occur for fear of the accident that influences safe operation, and reducing system disturbance as far as possible, the control system that the utility model provides can be carried out the conversion frequently of frequency conversion cut according to " induced draught fan frequency conversion cut triggers frequently " signal.The supercritical unit induced draught fan frequency-changing control system that Fig. 2 provides for the utility model embodiment is from frequency conversion cut flow chart frequently, and this flow process may further comprise the steps:
S1: judging whether to receive " induced draught fan frequency conversion cut triggers frequently " signal, is then to carry out S2, otherwise continues operation frequency conversion mode.Wherein, " induced draught fan frequency conversion cut triggers frequently " signal is made up of with institute following three conditions:
A) " the frequency conversion mode was delayed time disconnected 3 seconds ";
B) " fan power switch QF is closing the position ";
C) " fault is thought highly of in the induced draught fan frequency conversion " or " the manual frequency conversion cut of operations staff button time-delay frequently 1 second ";
S2: induced draught fan frequency conversion cut frequently, namely after " induced draught fan frequency conversion cut triggers frequently " signal triggering, DCS sends interlocking of signals and disconnects frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2, and corresponding blower fan stator blade override closed to the corresponding opening value of unit load, this corresponding relation is as shown in Figure 3; Fault side frequency conversion automatic control regulator with combustion chamber draft is cut to manually simultaneously.
S3: judge that whether induced draught fan frequency conversion cut is successful frequently, if then jump to S4, otherwise jumps to S5;Particularly, if " induced draught fan frequency conversion cut triggers frequently " signal lag is after 2 seconds and frequency variator input side high-voltage electric switch QF1, output side transducer high-voltage electric switch QF2 separating brake success, then DCS sends " induced draught fan frequency conversion cut closes frequency variator bypass high-voltage electric switch QF3 frequently automatically " interlocking of signals combined floodgate frequency variator bypass high-voltage electric switch QF3.Namely judge " induced draught fan frequency conversion cut frequently success " if frequency variator bypass high-voltage electric switch QF3 closes a floodgate successfully and fan power switch QF switch is still closing the position this moment; Do not close a floodgate yet success or fan power switch switch QF disconnects then judgement " induced draught fan frequency conversion cut is failed frequently " if " induced draught fan frequency conversion cut frequently close automatically frequency variator bypass high-voltage electric switch QF3 " signal that DCS sends sends back frequency variator bypass above 4 seconds high-voltage electric switch QF3.
S4: induced draught fan moves in the power frequency mode.
S5: induced draught fan RB signal triggering.
The supercritical unit induced draught fan frequency-changing control system that the utility model embodiment provides has following beneficial effect:
1, by cancellation desulfurization booster fan, induced draught fan dilatation, frequency conversion transformation adopt the induced draught fan of the unit of this induced draught fan frequency-changing control system to adopt the converting operation mode, and the stator blade standard-sized sheet significantly reduces the stator blade restriction loss, lowers the induced draught fan energy consumption, reduces station service power consumption rate.
2, during converting operation, the stator blade standard-sized sheet is by rotating speed control furnace pressure, controller parameter is optimized to be adjusted, guarantee under the converting operation mode that furnace pressure control more accurately and fast, stable, load responding accelerates, and improved the antijamming capability of furnace pressure control.And the furnace pressure control system adopts two cover control schemes, and design induced draught fan frequency conversion cut is controlled frequently, guarantees that induced draught fan frequency conversion, power frequency dual mode all can move, and the frequency conversion that can steadily carry out switches to the power frequency mode.
3, during the induced draught fan VFC, utilize variable frequency starting, rotating speed is lower, and inrush current is less, solves to the station service shock problem working life of improving blower fan greatly simultaneously.
4, after the booster fan cancellation, former by-pass damper is by shutoff, and the situation that does not exist by-pass damper to open by mistake guarantees that desulfurization drops into, and guarantees that environment protection digital is normal.
5, can realize all switches in the frequency-changing control system of DCS and the whole process control function of frequency variator; The induced draught fan frequency conversion is cut to the power frequency control logic, and when realizing the frequency conversion fault trip, induced draught fan is cut automatically to power frequency operation.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (3)
1. a supercritical unit induced draught fan frequency-changing control system is characterized in that, comprises the fan power switch, frequency variator input side high-voltage electric switch, the output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch, frequency variator and decentralized control system; Described fan power switch, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator series connection; Described frequency variator bypass high-voltage electric switch is in parallel with the series circuit of described frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch and frequency variator; Described decentralized control system is electrically connected respectively with described fan power switch, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch, is used for the folding condition of the described fan power switch of control, frequency variator input side high-voltage electric switch, output side transducer high-voltage electric switch, frequency variator bypass high-voltage electric switch and frequency variator.
2. a kind of supercritical unit induced draught fan frequency-changing control system as claimed in claim 1, it is characterized in that, described system is the frequency conversion mode during control induced draught fan starting up, and described decentralized control system is controlled described fan power switch, frequency variator input side high-voltage electric switch and output side transducer high-voltage electric switch and all is in "on" position under the described frequency conversion mode.
3. a kind of supercritical unit induced draught fan frequency-changing control system as claimed in claim 2, it is characterized in that, when described system is in the power frequency mode, described decentralized control system is controlled described frequency variator input side high-voltage electric switch and the output side transducer high-voltage electric switch is in off state, and described frequency variator bypass high-voltage electric switch is in "on" position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320229603 CN203223404U (en) | 2013-04-30 | 2013-04-30 | Frequency converting control system of supercritical unit induced draft fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320229603 CN203223404U (en) | 2013-04-30 | 2013-04-30 | Frequency converting control system of supercritical unit induced draft fan |
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| CN203223404U true CN203223404U (en) | 2013-10-02 |
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| CN 201320229603 Expired - Lifetime CN203223404U (en) | 2013-04-30 | 2013-04-30 | Frequency converting control system of supercritical unit induced draft fan |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295516A (en) * | 2014-08-08 | 2015-01-21 | 大唐三门峡发电有限责任公司 | Application of automatic switching mode of frequency converter of power station |
| WO2018076128A1 (en) * | 2016-10-28 | 2018-05-03 | 中国电建集团山东电力建设第一工程有限公司 | Test scheme for automatically switching from variable frequency to power frequency for primary draught fan in large unit |
| CN108183642A (en) * | 2017-12-31 | 2018-06-19 | 中国能源建设集团华东电力试验研究院有限公司 | 660MW supercritical unit voltage stabilizing washing pipe analysis systems |
| CN113027802A (en) * | 2021-05-11 | 2021-06-25 | 西安热工研究院有限公司 | Power frequency switching method for fault state of frequency converter of centrifugal fan of power station |
-
2013
- 2013-04-30 CN CN 201320229603 patent/CN203223404U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104295516A (en) * | 2014-08-08 | 2015-01-21 | 大唐三门峡发电有限责任公司 | Application of automatic switching mode of frequency converter of power station |
| WO2018076128A1 (en) * | 2016-10-28 | 2018-05-03 | 中国电建集团山东电力建设第一工程有限公司 | Test scheme for automatically switching from variable frequency to power frequency for primary draught fan in large unit |
| CN108183642A (en) * | 2017-12-31 | 2018-06-19 | 中国能源建设集团华东电力试验研究院有限公司 | 660MW supercritical unit voltage stabilizing washing pipe analysis systems |
| CN108183642B (en) * | 2017-12-31 | 2020-01-31 | 中国能源建设集团华东电力试验研究院有限公司 | 660MW supercritical unit voltage stabilization washing pipe analysis system |
| CN113027802A (en) * | 2021-05-11 | 2021-06-25 | 西安热工研究院有限公司 | Power frequency switching method for fault state of frequency converter of centrifugal fan of power station |
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