CN105201891B - Frequency conversion and movable vane combined control system for adjusting rotor blade air-introduced machine - Google Patents
Frequency conversion and movable vane combined control system for adjusting rotor blade air-introduced machine Download PDFInfo
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- CN105201891B CN105201891B CN201510621823.0A CN201510621823A CN105201891B CN 105201891 B CN105201891 B CN 105201891B CN 201510621823 A CN201510621823 A CN 201510621823A CN 105201891 B CN105201891 B CN 105201891B
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Abstract
The present invention relates to a kind of frequency conversion for adjusting rotor blade air-introduced machine and movable vane combined control system, including：Combustion chamber draft self-adjustment module, for by changing air-introduced machine frequency conversion rotating speed come automatic regulating stove thorax negative pressure；Movable vane aperture regulation module, for the functional relation by establishing movable vane aperture and boiler load, movable vane aperture is set to follow the change of boiler load and change.Compared with prior art, the present invention, which has, improves air-introduced machine performance driving economy and reliability, reduces power station station service power consumption rate, realizes energy-saving and emission-reduction.
Description
Technical field
The present invention relates to a kind of adjusting rotor blade air-introduced machine, more particularly, to a kind of frequency conversion for adjusting rotor blade air-introduced machine with
Movable vane combined control system.
Background technology
Air-introduced machine is the important auxiliary equipment of station boiler, for aspirating flue gas and the air more than needed that boiler combustion is formed,
So that burner hearth forms negative pressure, prevent from altering outside flame and flue gas leakage.Station boiler air-introduced machine can be generally divided into adjusting rotor blade and
The class of Silence Process two, for the air-introduced machine of Silence Process, change induced draft blower withdraws ability by adjusting the aperture of stator blade baffle plate,
To meet boiler varying duty demand, but need to turn down stator blade aperture at low load, restriction loss be present, influence economy.It is right
In the air-introduced machine of movable vane regulation, induced draft blower withdraws ability can be changed by adjusting movable vane aperture, do not throttled under underload
Loss, therefore efficiency is relatively higher than the air-introduced machine of Silence Process, but Fan Equipment cost is higher.In order to further improve air-introduced machine
Operating efficiency, Frequency Conversion Modification can be carried out to air-introduced machine, air inducing unit frequency can be reduced at low load, and by changing frequency
To adjust induced draft blower withdraws ability, combustion chamber draft is controlled.The domestic Frequency Conversion Modification that carried out to Silence Process air-introduced machine has more answer
With example, because adjusting rotor blade blower fan relative efficiency is higher, pertinent literature is had no to the dynamic blower fan progress Frequency Conversion Modification country that regulates and guides
Report.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is used for adjusting rotor blade
The frequency conversion of air-introduced machine and movable vane combined control system, improve air-introduced machine performance driving economy and reliability, reduce power station station-service
Electric rate, realizes energy-saving and emission-reduction.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of frequency conversion for adjusting rotor blade air-introduced machine and movable vane combined control system, it is characterised in that including：
Combustion chamber draft self-adjustment module, for by changing air-introduced machine frequency conversion rotating speed come automatic regulating stove thorax negative pressure；
Movable vane aperture regulation module, for the functional relation by establishing movable vane aperture and boiler load, make movable vane aperture
Follow the change of boiler load and change.
Described combustion chamber draft self-adjustment module is automatic to change air-introduced machine frequency conversion rotating speed according to the change of combustion chamber draft,
I.e. when combustion chamber draft is higher than setting value, increase frequency conversion rotating speed automatically；When combustion chamber draft is less than setting value, frequency conversion is reduced automatically
Rotating speed, combustion chamber draft is maintained in setting range.
Described functional relation is piecewise linear function relation.
Boiler load is raised, and movable vane aperture gradually opened greatly with setting speed, boiler load decline, and movable vane aperture is to set speed
Rate gradually turns down.
Functional relation in described step 2) is specially：
| Load | MW | 320 | 250 | 190 | 160 | 130 | <130 |
| Air-introduced machine movable vane aperture | % | 75 | 70 | 65 | 65 | 55 | 55 |
Compared with prior art, the present invention realizes the converting operation of air-introduced machine, reached using after jointly controlling mode
The purpose of energy-saving and emission-reduction, while by changing movable vane aperture, air-introduced machine safe and reliable operation is also ensure that, meet that unit safety passes through
The requirement of Ji reliability service.
Brief description of the drawings
Fig. 1 is that regulation and control system schematic diagram is combined in air-introduced machine frequency conversion of the present invention with movable vane.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
After carrying out Frequency Conversion Modification for the adjustable air-introduced machine of conventional stator blade, stator blade standard-sized sheet typically is used, by adjusting frequency conversion
Rotating speed adjusts induced draft blower withdraws ability, meets hearth vacuum control requirement.But for the Frequency Conversion on Induced Fan of adjusting rotor blade
Afterwards, the cheap and reliable method of operation is not necessarily by the way of movable vane standard-sized sheet, needs to study rationally applicable air inducing for this
Machine frequency conversion-movable vane joint regulative mode, realizes the reliable and economical operation of air-introduced machine.
It is found by experiment that, as boiler load reduces, air-introduced machine frequency conversion rotating speed also accordingly reduces, in this process such as
Fruit movable vane standard-sized sheet all the time, then air-introduced machine may enter work unstability region, two air-introduced machines when operating mode disturbs at low load
In the presence of " tacking " phenomenon, causing an increase of contributing, an output drastically declines and surge occurs, furnace pressure fluctuation aggravation,
The critical safe operation of the boiler of meeting, causes boiler flameout to protect if serious.
Afterwards by experiment, under boiler different load, combustion chamber draft is automatically adjusted by air-introduced machine frequency conversion, and it is motor-driven to change air inducing
Leaf aperture, air-introduced machine operating efficiency and performance are tested under different movable vane apertures, the movable vane for finding economy and stable operation is opened
Degree, draws movable vane aperture and the functional relation of boiler load.
For adjusting rotor blade air-introduced machine, a kind of new control method is invented, i.e. air-introduced machine frequency conversion-movable vane joint is adjusted
Mode, combustion chamber draft is automatically adjusted by air-introduced machine frequency conversion, i.e., it is automatic to change air-introduced machine frequency conversion turn according to the change of combustion chamber draft
Speed, combustion chamber draft is maintained near setting value；Movable vane aperture is arranged to the function of boiler load, follows the change of boiler load to delay
Slow change, i.e. boiler load are raised, and movable vane is gradually opened greatly with given pace, and boiler load declines, and movable vane is gradual with given pace
Turn down, realize that air-introduced machine frequency conversion-movable vane jointly controls, realize the energy-saving effect of air-introduced machine converting operation, meet that boiler safety can
By the requirement of operation.
Specific implementation step is as follows：
The economic aperture under different load is determined by air-introduced machine performance test；
Upgrade the control function for increasing air-introduced machine frequency conversion and automatically adjusting combustion chamber draft by control function；
The function that movable vane aperture is arranged to boiler load is designed by control function, follows boiler load with given pace
Change；
Regulatory function is combined come Optimization Debugging air-introduced machine frequency conversion-movable vane by load change test.
Using it is this jointly control mode after, realize the converting operation of air-introduced machine, reached the purpose of energy-saving and emission-reduction, together
When by changing movable vane aperture, also ensure that air-introduced machine safe and reliable operation, meet the requirement of unit safety economic and reliable operation.
For the station boiler of a certain 300MW unit, two adjusting rotor blade air-introduced machines are equipped with, air-introduced machine carries out frequency conversion and changed
After making, by air-introduced machine performance test, the economic movable vane aperture of different load, functional relation are drawn under air-introduced machine conversion system
As shown in table 1：
Table 1
| Load | MW | 320 | 250 | 190 | 160 | 130 | <130 |
| IDF movable vane apertures | % | 75 | 70 | 65 | 65 | 55 | 55 |
Air-introduced machine frequency conversion-movable vane joint regulation, i.e., follow boiler using air-introduced machine VFC combustion chamber draft, movable vane aperture
Load variations, its control system schematic diagram is as shown in Figure 1.Combustion chamber draft is mainly by air-introduced machine variable frequency adjustment, air-introduced machine movable vane master
Follow boiler load instruction to change according to given pace, participate in the auxiliary adjustment of combustion chamber draft.
In addition, when the special operation conditions such as generation pressure fan RB need fast cutback, two air-introduced machine movable vanes are quickly corresponding
Turn down, air-introduced machine frequency conversion controls combustion chamber draft at that time still in state is automatically adjusted.
Claims (3)
1. a kind of frequency conversion for adjusting rotor blade air-introduced machine and movable vane combined control system, it is characterised in that including：
Combustion chamber draft self-adjustment module, for by changing air-introduced machine frequency conversion rotating speed come automatic regulating stove thorax negative pressure；
Movable vane aperture regulation module, for the functional relation by establishing movable vane aperture and boiler load, follow movable vane aperture
The change of boiler load and change；
Described functional relation is piecewise linear function relation；
Boiler load is raised, and movable vane aperture gradually opened greatly with setting speed, boiler load decline, movable vane aperture with set speed by
Gradually turn down；
By the way of air-introduced machine frequency conversion-movable vane joint regulation, combustion chamber draft is automatically adjusted by air-introduced machine frequency conversion, i.e., according to burner hearth
The change of negative pressure, it is automatic to change air-introduced machine frequency conversion rotating speed, combustion chamber draft is maintained near setting value；Movable vane aperture is arranged to boiler
The function of load, follow the change of boiler load slowly varying；
Using it is this jointly control mode after, realize the converting operation of air-introduced machine, reached the purpose of energy-saving and emission-reduction, simultaneously lead to
Change movable vane aperture is crossed, also ensure that air-introduced machine safe and reliable operation, meets the requirement of unit safety economic and reliable operation.
2. a kind of frequency conversion for adjusting rotor blade air-introduced machine according to claim 1 and movable vane combined control system, it is special
Sign is that described combustion chamber draft self-adjustment module changes air-introduced machine frequency conversion rotating speed, i.e., automatically according to the change of combustion chamber draft
When combustion chamber draft is higher than setting value, increase frequency conversion rotating speed automatically；It is automatic to reduce frequency conversion turn when combustion chamber draft is less than setting value
Speed, combustion chamber draft is maintained in setting range.
3. a kind of frequency conversion for adjusting rotor blade air-introduced machine according to claim 1 and movable vane combined control system, it is special
Sign is that described piecewise linear function relation is specially：
。
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| CN201510621823.0A CN105201891B (en) | 2015-09-25 | 2015-09-25 | Frequency conversion and movable vane combined control system for adjusting rotor blade air-introduced machine |
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| CN201510621823.0A CN105201891B (en) | 2015-09-25 | 2015-09-25 | Frequency conversion and movable vane combined control system for adjusting rotor blade air-introduced machine |
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| CN105201891B true CN105201891B (en) | 2018-03-30 |
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| CN110630551B (en) * | 2019-09-10 | 2020-07-31 | 中国能源建设集团华中电力试验研究院有限公司 | Automatic paralleling method and system for induced draft fans of thermal generator set |
| CN112228893A (en) * | 2020-10-23 | 2021-01-15 | 大唐湘潭发电有限责任公司 | Air volume adjusting device and method for draught fan of large power station boiler |
| CN116816716B (en) * | 2023-08-30 | 2023-11-21 | 苏州汇川控制技术有限公司 | Fan system control method, frequency converter, fan system and storage medium |
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| KR101277163B1 (en) * | 2011-05-13 | 2013-06-19 | 가부시끼가이샤 도시바 | Apparatus for supplying voltage, rotation machine and method for supplying voltage |
| CN202690484U (en) * | 2012-04-27 | 2013-01-23 | 昆山化工医药原料有限公司 | Frequency conversion control system of boiler induced-draft fan |
| CN202852865U (en) * | 2012-10-30 | 2013-04-03 | 新疆杰瑞节能环保设备有限公司 | Hearth air-inducing control system |
| CN103868096B (en) * | 2014-03-11 | 2016-06-08 | 莱芜钢铁集团有限公司 | A kind of hearth vacuum control method and Controlling System |
| CN104329281B (en) * | 2014-10-20 | 2017-06-13 | 东方日立(成都)电控设备有限公司 | A kind of adjusting rotor blade formula air-introduced machine frequency conversion energy-saving system |
| CN204476822U (en) * | 2015-01-28 | 2015-07-15 | 国电龙源节能技术有限公司 | Axial flow movable vane regulates the speed control system of blower fan |
| CN104895820B (en) * | 2015-07-02 | 2016-09-28 | 东方日立(成都)电控设备有限公司 | A kind of energy-conserving and optimizing control method of variable moning blade axial flow fan frequency conversion energy-saving system |
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