CN104728857A - Coal-fired boiler secondary air valve baffle control method based on burner heat loads - Google Patents
Coal-fired boiler secondary air valve baffle control method based on burner heat loads Download PDFInfo
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- CN104728857A CN104728857A CN201510005586.5A CN201510005586A CN104728857A CN 104728857 A CN104728857 A CN 104728857A CN 201510005586 A CN201510005586 A CN 201510005586A CN 104728857 A CN104728857 A CN 104728857A
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- secondary air
- coal
- burner
- control method
- ature
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Abstract
The invention relates to a coal-fired boiler secondary air valve baffle control method based on burner heat loads. The secondary air valve aperture is set according to different burning characteristics of burners on all layers, the secondary air interlayer distribution is controlled, and real-time matching control over secondary air distribution of burner areas and the heat loads of the burners on all layers is carried out. Compared with the prior art, the coal-fired boiler secondary air valve baffle control method has the advantages that burning conditions of the different heat loads of the burners can be met, the boiler burning economical efficiency is improved, the NOx emission is reduced, and the smoke temperature deviation is reduced.
Description
Technical field
The present invention relates to a kind of coal-burning boiler secondary air register baffle plate control method, especially relate to a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load.
Background technology
At present, the secondary air register control method many employings burner hearth-large bellows differential pressure control method of coal-fired electric generation furnace, the adjustment of its secondary air carrys out co-controlling by setting total blast volume curve and burner hearth large bellows differential pressure curve, this is a kind of simple combustion control mode, constant based on ature of coal, its principle is the burner equal distribution wind that respectively puts into operation.Its drawback is only to control burner hearth-large bellows differential pressure, does not retrain, cannot respond the combustion conditions of each grate firing burner thermic load inequality to the little damper of each grate firing burner.After pulverizer capacity difference, as-fired coal qualitative change or secondary air register are manually intervened, when burner hearth-large bellows differential pressure still meets demand for control, but the burner air distribution of burner hearth inside is unreasonable already.Boiler combustion is caused to be deteriorated, aggravation furnace outlet gas temperature deviation.
In recent years, the ature of coal source of coal-fired power plant is numerous and diverse, power plant adopts mixes after burning mode because ature of coal is different, exerting oneself that coal-grinding function is normally run is different, cause the thermic load of each grate firing burner and combustion characteristics all to differ greatly, therefore according to the different coal characteristic of each grate firing burner and must exert oneself, each grate firing burner additional ventilation flap aperture is accurately set targetedly, stablize with combustible combustion to ensure to catch fire complete, realize security and the economy of mixing burning.And this to be current burner hearth large bellows differential pressure control mode be difficult to realizes.
Summary of the invention
Object of the present invention is exactly provide a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load to overcome defect that above-mentioned prior art exists, ensures the real-time matching of secondary air flow and burner thermic load.
Object of the present invention can be achieved through the following technical solutions:
A kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load, it is characterized in that, the combustion characteristics setting secondary air register aperture different according to each grate firing burner, control the storey distribution of Secondary Air, thus with each grate firing burner thermic load, real-time matching control is carried out to the distribution of burner region Secondary Air.
Described secondary air register aperture is specifically calculated as follows:
Adjacent layer secondary air damper aperture=DO
0+ (B × k
b+ C × k
c)/2/Q × (DO
max-DO
0)
Wherein B, C are the pulverizer capacity of adjacent layer respectively, k
b, k
cfor the correction coefficient of heat load of corresponding burner ature of coal, Q is every grate firing burner maximum heating load, DO
0for secondary air register cooling aperture, DO
maxfor maximum opening.
When ature of coal changes, only need the correction coefficient of heat load changing ature of coal.
The change of the correction coefficient of heat load of described ature of coal manually or automatically completes.
When the described correction coefficient of heat load automatically having completed ature of coal changes, change correction factor by ature of coal self-checking device, realize the automatic control that secondary air register baffle plate becomes ature of coal operating mode.
Described maximum opening is determined by burner hearth-large minimum limit value of bellows differential pressure.
Compared with prior art, the present invention can meet the combustion conditions of the different thermic load of burner (pulverizer capacity under ature of coal as different, same in ature of coal is different), improves boiler combustion economy, reduces NO
xdischarge, minimizing gas temperature windage.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment
Boiler total blast volume is controlled by pressure fan, and secondary air register baffle opening controls according to burner thermic load, and aperture is the relation function of adjacent two layers burner thermic load sum.Burner thermic load is the correction coefficient of heat load that corresponding pulverizer capacity is multiplied by ature of coal, and this correction factor is relevant with coal characteristic.The minimum aperture of secondary air damper is cooling aperture, and maximum opening is determined by burner hearth-large minimum limit value of bellows differential pressure.
For BC layer secondary air damper aperture, if B layer, C layer pulverizer capacity are B, C, burner correction coefficient of heat load is k
b, k
c, every grate firing burner maximum heating load is Q, secondary air register cooling aperture DO
0, maximum opening DO
max, then
BC layer secondary air damper aperture
＝DO
0+(B×k
B+C×k
C)/2/Q×(DO
max-DO
0)
When power plant coal quality changes, only need manually to change ature of coal coefficient, if there is ature of coal self-checking device in power plant, then setting can complete automatically, realizes the automatic control that secondary air register baffle plate becomes ature of coal operating mode.
Claims (6)
1. the coal-burning boiler secondary air register baffle plate control method based on burner thermic load, it is characterized in that, the combustion characteristics setting secondary air register aperture different according to each grate firing burner, control the storey distribution of Secondary Air, thus with each grate firing burner thermic load, real-time matching control is carried out to the distribution of burner region Secondary Air.
2. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 1, it is characterized in that, described secondary air register aperture is specifically calculated as follows:
Adjacent layer secondary air damper aperture=DO
0+ (B × k
b+ C × k
c)/2/Q × (DO
max-DO
0)
Wherein B, C are the pulverizer capacity of adjacent layer respectively, k
b, k
cfor the correction coefficient of heat load of corresponding burner ature of coal, Q is every grate firing burner maximum heating load, DO
0for secondary air register cooling aperture, DO
maxfor maximum opening.
3. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 2, is characterized in that, when ature of coal changes, only needs the correction coefficient of heat load changing ature of coal.
4. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 3, it is characterized in that, the change of the correction coefficient of heat load of described ature of coal manually or automatically completes.
5. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 4, it is characterized in that, when the described correction coefficient of heat load automatically having completed ature of coal changes, change correction factor by ature of coal self-checking device, realize the automatic control that secondary air register baffle plate becomes ature of coal operating mode.
6. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 2, is characterized in that, described maximum opening is determined by burner hearth-large minimum limit value of bellows differential pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510005586.5A CN104728857B (en) | 2015-01-05 | 2015-01-05 | Coal-burning boiler secondary air register baffle plate control method based on burner thermic load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510005586.5A CN104728857B (en) | 2015-01-05 | 2015-01-05 | Coal-burning boiler secondary air register baffle plate control method based on burner thermic load |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104728857A true CN104728857A (en) | 2015-06-24 |
| CN104728857B CN104728857B (en) | 2017-03-08 |
Family
ID=53453010
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|---|---|---|---|
| CN201510005586.5A Active CN104728857B (en) | 2015-01-05 | 2015-01-05 | Coal-burning boiler secondary air register baffle plate control method based on burner thermic load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709907A (en) * | 2018-11-16 | 2019-05-03 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | The boiler combustion process model integrated learning method and system of genetic programming algorithm based on tree |
| CN112413634A (en) * | 2020-10-22 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Secondary air control method for front-back wall hedging coal-fired power station boiler |
-
2015
- 2015-01-05 CN CN201510005586.5A patent/CN104728857B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109709907A (en) * | 2018-11-16 | 2019-05-03 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | The boiler combustion process model integrated learning method and system of genetic programming algorithm based on tree |
| CN112413634A (en) * | 2020-10-22 | 2021-02-26 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Secondary air control method for front-back wall hedging coal-fired power station boiler |
| CN112413634B (en) * | 2020-10-22 | 2022-09-20 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Secondary air control method for front-back wall hedging coal-fired power station boiler |
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|---|---|
| CN104728857B (en) | 2017-03-08 |
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