CN105134637A - Method for variable frequency and rotor blade joint control of rotor-blade-adjustable induced draft fan - Google Patents
Method for variable frequency and rotor blade joint control of rotor-blade-adjustable induced draft fan Download PDFInfo
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- CN105134637A CN105134637A CN201510621862.0A CN201510621862A CN105134637A CN 105134637 A CN105134637 A CN 105134637A CN 201510621862 A CN201510621862 A CN 201510621862A CN 105134637 A CN105134637 A CN 105134637A
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- draught fan
- induced draught
- frequency conversion
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Abstract
The invention relates to a method for variable frequency and rotor blade joint control of a rotor-blade-adjustable induced draft fan. The method comprises the following steps: (1) the negative pressure in a furnace chamber is automatically adjusted by changing the variable-frequency rotating speed of the induced draft fan; (2) a function relationship between the rotor blade openness and the boiler load is established, wherein the rotor blade openness is changed with the boiler load. Compared with the prior art, the method provided by the invention has the advantages that the operating economy and reliability of the induced draft fan are improved, the power consumption rate of a power station is lowered, and energy conservation and emission reduction are achieved.
Description
Technical field
The present invention relates to a kind of adjusting rotor blade induced draught fan, especially relate to a kind of frequency conversion for adjusting rotor blade induced draught fan and movable vane combination control method.
Background technique
Induced draught fan is the important supplementary equipment of station boiler, for aspirating the flue gas of boiler burning formation and air more than needed, makes burner hearth form negative pressure, prevents from altering outside flame leaking outside with flue gas.Station boiler induced draught fan generally can be divided into adjusting rotor blade and Silence Process two class, for the induced draught fan of Silence Process, induced draft blower withdraws ability is changed by regulating the aperture of stator blade baffle plate, to meet boiler varying duty demand, but need at low load to turn down stator blade aperture, there is restriction loss, affect Economy.For the induced draught fan that movable vane regulates, induced draft blower withdraws ability can be changed by adjustment movable vane aperture, there is no restriction loss under low-load, therefore efficiency is relatively higher than the induced draught fan of Silence Process, but Fan Equipment cost be higher.In order to improve the working efficiency of induced draught fan further, Frequency Conversion Modification can be carried out to induced draught fan, induced draught fan frequency can be reduced at low load, and regulate induced draft blower withdraws ability by changing frequency, control combustion chamber draft well.Domesticly Frequency Conversion Modification is carried out to Silence Process induced draught fan there is more application example, because adjusting rotor blade blower fan relative efficiency is higher, the dynamic blower fan that regulates and guides is carried out that Frequency Conversion Modification is domestic has no pertinent literature report.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of frequency conversion for adjusting rotor blade induced draught fan and movable vane combination control method are provided, improve induced draught fan performance driving economy and reliability, reduce power station station service power consumption rate, achieve energy-saving and emission-reduction.
Object of the present invention can be achieved through the following technical solutions:
For frequency conversion and the movable vane combination control method of adjusting rotor blade induced draught fan, it is characterized in that, comprising:
1) automatic regulating stove thorax negative pressure is carried out by changing induced draught fan frequency conversion rotating speed;
2) movable vane aperture and boiler load set up function relation, follow the change of boiler load and change.
Described step 1) be specially:
According to the change of combustion chamber draft, automatically change induced draught fan frequency conversion rotating speed, namely when combustion chamber draft is higher than setting value, automatically increase frequency conversion rotating speed; When combustion chamber draft is lower than setting value, automatically reduce frequency conversion rotating speed, maintain combustion chamber draft in setting range.
Described step 2) in function relation be piecewise linear function relation.
Boiler load raises, and movable vane aperture is opened greatly to set speed gradually, and boiler load declines, and movable vane aperture turns down gradually to set speed.
Described step 2) in function relation be specially
| Load | MW | 320 | 250 | 190 | 160 | 130 | <130 |
| Induced draught fan movable vane aperture | ％ | 75 | 70 | 65 | 65 | 55 | 55 |
Compared with prior art, the present invention achieves the converting operation of induced draught fan after adopting and jointly controlling mode, reach the object of energy-saving and emission-reduction, simultaneously by changing movable vane aperture, also ensure that induced draught fan safe and reliable operation, meeting the requirement of the economic reliable operation of unit safety.
Accompanying drawing explanation
Fig. 1 is induced draught fan frequency conversion of the present invention and movable vane combine regulation schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
After Frequency Conversion Modification is carried out for the induced draught fan of conventional Silence Process, generally adopt stator blade standard-sized sheet, regulate induced draft blower withdraws ability by adjustment frequency conversion rotating speed, meet hearth vacuum control requirement.But after the Frequency Conversion on Induced Fan of adjusting rotor blade, adopt the mode of movable vane the standard-sized sheet not necessarily economic and reliable method of operation, need to study the induced draught fan frequency conversion-movable vane combine regulation mode be rationally suitable for for this reason, realize the reliable of induced draught fan and economical operation.
Found by test; along with boiler load reduces; the also corresponding reduction of induced draught fan frequency conversion rotating speed, if movable vane standard-sized sheet all the time in this process, then induced draught fan may enter work unstability region at low load; during operating mode disturbance there is " tacking " phenomenon in two induced draught fans; cause an increase of exerting oneself, exert oneself for one and sharply decline and surge occurs, furnace pressure fluctuation aggravates; serious words can critical safe operation of the boiler, causes boiler flameout to protect.
Afterwards by test, under boiler different load, combustion chamber draft is regulated automatically by induced draught fan frequency conversion, change induced draught fan movable vane aperture, induced draught fan working efficiency and performance is tested under different movable vane apertures, find the movable vane aperture of economy and stable operation, draw the function relation of movable vane aperture and boiler load.
For adjusting rotor blade induced draught fan, invent a kind of new controlling method, i.e. the mode of induced draught fan frequency conversion-movable vane combine regulation, automatically combustion chamber draft is regulated by induced draught fan frequency conversion, namely according to the change of combustion chamber draft, automatically change induced draught fan frequency conversion rotating speed, maintain combustion chamber draft near setting value; Movable vane aperture is set to the function of boiler load, the change of following boiler load slowly changes, namely boiler load raises, movable vane is opened greatly with given pace gradually, boiler load declines, and movable vane turns down gradually with given pace, realizes induced draught fan frequency conversion-movable vane and jointly controls, realize the energy-saving effect of induced draught fan converting operation, meet the requirement of boiler safety reliable operation.
Concrete implementation step is as follows:
By the economic aperture under induced draught fan performance test determination different load;
The controlling functions that induced draught fan frequency conversion regulates combustion chamber draft is automatically increased by controlling functions upgrading;
By controlling functions design, movable vane aperture is set to the function of boiler load, follows boiler load and change with given pace;
Optimization Debugging induced draught fan frequency conversion-movable vane combine regulation function is carried out by load change test.
Adopt this jointly control mode after, achieve the converting operation of induced draught fan, reach the object of energy-saving and emission-reduction, simultaneously by changing movable vane aperture, also ensure that induced draught fan safe and reliable operation, meeting the requirement of the economic reliable operation of unit safety.
For the station boiler of a certain 300MW unit, be equipped with two adjusting rotor blade induced draught fans, after induced draught fan carries out Frequency Conversion Modification, by induced draught fan performance test, under induced draught fan conversion system, draw the economic movable vane aperture of different load, function relation is as shown in table 1:
Table 1
| Load | MW | 320 | 250 | 190 | 160 | 130 | <130 |
| IDF movable vane aperture | ％ | 75 | 70 | 65 | 65 | 55 | 55 |
Induced draught fan frequency conversion-movable vane combine regulation, namely adopts induced draught fan VFC combustion chamber draft, and movable vane aperture follows boiler load change, and it controls schematic diagram as shown in Figure 1.Combustion chamber draft is primarily of induced draught fan variable frequency adjustment, and induced draught fan movable vane is mainly followed boiler load instruction and changed according to given pace, participates in the auxiliary adjustment of combustion chamber draft.
In addition, when the special operation conditions such as gas fan RB occurs need fast cutback, two induced draught fan movable vanes are corresponding fast to be turned down, and induced draught fan frequency conversion is still in automatic adjustment state, the combustion chamber draft controlled well at that time.
Claims (5)
1., for frequency conversion and the movable vane combination control method of adjusting rotor blade induced draught fan, it is characterized in that, comprising:
1) automatic regulating stove thorax negative pressure is carried out by changing induced draught fan frequency conversion rotating speed;
2) movable vane aperture and boiler load set up function relation, follow the change of boiler load and change.
2. a kind of frequency conversion for adjusting rotor blade induced draught fan according to claim 1 and movable vane combination control method, is characterized in that, described step 1) be specially:
According to the change of combustion chamber draft, automatically change induced draught fan frequency conversion rotating speed, namely when combustion chamber draft is higher than setting value, automatically increase frequency conversion rotating speed; When combustion chamber draft is lower than setting value, automatically reduce frequency conversion rotating speed, maintain combustion chamber draft in setting range.
3. a kind of frequency conversion for adjusting rotor blade induced draught fan according to claim 1 and movable vane combination control method, is characterized in that, described step 2) in function relation be piecewise linear function relation.
4. a kind of frequency conversion for adjusting rotor blade induced draught fan according to claim 3 and movable vane combination control method, it is characterized in that, boiler load raises, and movable vane aperture is opened greatly to set speed gradually, boiler load declines, and movable vane aperture turns down gradually to set speed.
5. a kind of frequency conversion for adjusting rotor blade induced draught fan according to claim 3 and movable vane combination control method, is characterized in that, described step 2) in function relation be specially
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510621862.0A CN105134637B (en) | 2015-09-25 | 2015-09-25 | Frequency conversion and movable vane combination control method for adjusting rotor blade air-introduced machine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510621862.0A CN105134637B (en) | 2015-09-25 | 2015-09-25 | Frequency conversion and movable vane combination control method for adjusting rotor blade air-introduced machine |
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| CN105134637A true CN105134637A (en) | 2015-12-09 |
| CN105134637B CN105134637B (en) | 2017-09-26 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555771A (en) * | 2015-09-25 | 2017-04-05 | 上海上电漕泾发电有限公司 | For the stator blade and frequency conversion combination control method of Silence Process air-introduced machine |
| CN107588031A (en) * | 2017-10-24 | 2018-01-16 | 西安热工研究院有限公司 | A kind of online dynamic switching method of power station Axial Fan with Adjustable Vanes rotating speed |
| CN110159578A (en) * | 2019-04-25 | 2019-08-23 | 秦皇岛秦热发电有限责任公司 | Long axis system axial flow blower movable vane adjusts the combination adjusting method with variable frequency adjustment |
| CN112228381A (en) * | 2020-11-20 | 2021-01-15 | 东方日立(成都)电控设备有限公司 | Variable-frequency movable vane coordination control method for movable vane adjustable fan |
| CN112923393A (en) * | 2021-03-31 | 2021-06-08 | 西安热工研究院有限公司 | Induced draft fan guide vane control system and method in auxiliary machine fault load reduction process |
| CN113007123A (en) * | 2021-03-08 | 2021-06-22 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
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| CN104895820A (en) * | 2015-07-02 | 2015-09-09 | 东方日立(成都)电控设备有限公司 | Energy-saving optimization control method of moving-blade-adjustable axial flow fan variable-frequency energy-saving system |
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| US4177649A (en) * | 1977-11-01 | 1979-12-11 | Borg-Warner Corporation | Surge suppression apparatus for compressor-driven system |
| JPS5949394A (en) * | 1982-09-13 | 1984-03-21 | Taikisha Ltd | Operation control method of blower or pump |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106555771A (en) * | 2015-09-25 | 2017-04-05 | 上海上电漕泾发电有限公司 | For the stator blade and frequency conversion combination control method of Silence Process air-introduced machine |
| CN106555771B (en) * | 2015-09-25 | 2019-04-05 | 上海上电漕泾发电有限公司 | Stator blade and frequency conversion combination control method for Silence Process air-introduced machine |
| CN107588031A (en) * | 2017-10-24 | 2018-01-16 | 西安热工研究院有限公司 | A kind of online dynamic switching method of power station Axial Fan with Adjustable Vanes rotating speed |
| CN107588031B (en) * | 2017-10-24 | 2019-03-01 | 西安热工研究院有限公司 | A kind of online dynamic switching method of power station Axial Fan with Adjustable Vanes revolving speed |
| CN110159578A (en) * | 2019-04-25 | 2019-08-23 | 秦皇岛秦热发电有限责任公司 | Long axis system axial flow blower movable vane adjusts the combination adjusting method with variable frequency adjustment |
| CN112228381A (en) * | 2020-11-20 | 2021-01-15 | 东方日立(成都)电控设备有限公司 | Variable-frequency movable vane coordination control method for movable vane adjustable fan |
| CN113007123A (en) * | 2021-03-08 | 2021-06-22 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
| CN113007123B (en) * | 2021-03-08 | 2022-12-30 | 国家能源集团国源电力有限公司 | Control method and device of induced draft fan, electronic equipment and storage medium |
| CN112923393A (en) * | 2021-03-31 | 2021-06-08 | 西安热工研究院有限公司 | Induced draft fan guide vane control system and method in auxiliary machine fault load reduction process |
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| CN105134637B (en) | 2017-09-26 |
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