CN104728857B - Coal-burning boiler secondary air register baffle plate control method based on burner thermic load - Google Patents
Coal-burning boiler secondary air register baffle plate control method based on burner thermic load Download PDFInfo
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- CN104728857B CN104728857B CN201510005586.5A CN201510005586A CN104728857B CN 104728857 B CN104728857 B CN 104728857B CN 201510005586 A CN201510005586 A CN 201510005586A CN 104728857 B CN104728857 B CN 104728857B
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- coal
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- secondary air
- air register
- baffle plate
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Abstract
The present invention relates to a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load, secondary air register aperture is set according to the different combustion characteristics of each layer burner, control the storey distribution of secondary wind, thus real-time matching control is carried out with each layer burner thermic load to the distribution of burner region secondary wind.Compared with prior art, the present invention has the combustion conditions that can meet burner difference thermic load, improves boiler combustion economy, reduces NOxDischarge, minimizing gas temperature windage.
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 hot based on burner
The coal-burning boiler secondary air register baffle plate control method of load.
Background technology
At present, adopt burner hearth-big bellows differential pressure control method the secondary air register control method of coal-fired electric generation furnace, it is auxiliary more
The regulation helping secondary wind is by setting total blast volume curve and burner hearth big bellows differential pressure curve come co- controlling, and this is a kind of letter
Single 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 stove
Thorax-big bellows differential pressure, to each layer burner, little damper does not constrain it is impossible to respond the uneven combustion of each layer burner thermic load
Burn operating mode.After pulverizer capacity difference, as-fired coal qualitative change or secondary air register are intervened manually, in burner hearth-big bellows differential pressure still
When so meeting demand for control, but the burner air distribution within burner hearth is already unreasonable.Lead to boiler combustion to be deteriorated, aggravate burner hearth
Outlet gas temperature windage.
In recent years, the ature of coal source of coal-fired power plant is numerous and diverse, power plant using mixing because ature of coal is different after burning mode, coal pulverizer
Exerting oneself of normally running is different, cause the thermic load of each layer burner and combustion characteristics all differ greatly it is therefore necessary to
According to the different coal characteristic of each layer burner and exerting oneself, targetedly accurately each layer burner additional ventilation flap aperture is set,
Stablized with ensureing to catch fire and combustible combustion is complete, realize mixing safety and the economy of burning.And this is current burner hearth strong wind
Case differential pressure control mode is difficult to.
Content of the invention
The purpose of the present invention is exactly to overcome the defect of above-mentioned prior art presence to provide a kind of hot based on burner
The coal-burning boiler secondary air register baffle plate control method of load is it is ensured that the real-time matching of secondary air flow and burner thermic load.
The purpose 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 is it is characterised in that according to each
The different combustion characteristics of layer burner sets secondary air register aperture, controls the storey distribution of secondary wind, thus to burner region
Secondary wind distribution carries out real-time matching control with each layer burner thermic load.
Described secondary air register aperture is specifically calculated as follows：
Adjacent layer secondary air damper aperture=DO0+(B×kB+C×kC)/2/Q×(DOmax-DO0)
Wherein B, C are the pulverizer capacity of adjacent layer respectively, kB、kCFor corresponding to the correction coefficient of heat load of burner ature of coal,
Q is every layer of burner maximum heating load, DO0Cool down aperture, DO for secondary air registermaxFor maximum opening.
When ature of coal changes it is only necessary to change the correction coefficient of heat load of ature of coal.
The change of the correction coefficient of heat load of described ature of coal manually or automatically completes.
Described be automatically performed when completing the correction coefficient of heat load of ature of coal and changing, changed by ature of coal self-checking device
Become correction factor, realize secondary air register baffle plate and become automatically controlling of ature of coal operating mode.
Described maximum opening is determined by burner hearth-big bellows differential pressure minimum limit value.
Compared with prior art, the present invention can meet burner difference thermic load (under as different in ature of coal, same ature of coal
Pulverizer capacity is different) combustion conditions, improve boiler combustion economy, reduce NOxDischarge, minimizing gas temperature windage.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.
Embodiment
Boiler total blast volume is controlled according to burner thermic load by pressure fan control, secondary air register baffle opening, and aperture is phase
The relation function of adjacent two-layer burner thermic load sum.Burner thermic load is the thermic load that corresponding pulverizer capacity is multiplied by ature of coal
Correction factor, this correction factor is related with coal characteristic.Secondary air damper minimum aperture is cooling aperture, and maximum opening is by stove
Thorax-big bellows differential pressure minimum limit value determines.
Taking BC layer secondary air damper aperture as a example, if B layer, C layer pulverizer capacity are B, C, burner thermic load correction system
Number is kB、kC, every layer of burner maximum heating load is Q, and secondary air register cools down aperture DO0, maximum opening DOmax, then
BC layer secondary air damper aperture
=DO0+(B×kB+C×kC)/2/Q×(DOmax-DO0)
When power plant coal quality changes, only ature of coal coefficient need to be manually changed, if power plant has ature of coal automatically to check dress
Put, then set and can be automatically performed, realize secondary air register baffle plate and become automatically controlling of ature of coal operating mode.
Claims (5)
1. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load is it is characterised in that according to each layer
The different combustion characteristics of burner sets secondary air register aperture, controls the storey distribution of secondary wind, thus to burner region two
Secondary wind distribution carries out real-time matching control with each layer burner thermic load；
Described secondary air register aperture is specifically calculated as follows：
Adjacent layer secondary air damper aperture=DO0+(B×kB+C×kC)/2/Q×(DOmax-DO0)
Wherein B, C are the pulverizer capacity of adjacent layer respectively, kB、kCFor corresponding to the correction coefficient of heat load of burner ature of coal, Q is
Every layer of burner maximum heating load, DO0Cool down aperture, DO for secondary air registermaxFor maximum opening.
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, when ature of coal changes it is only necessary to change the correction coefficient of heat load of ature of coal.
3. a kind of coal-burning boiler secondary air register baffle plate control method based on burner thermic load according to claim 2,
It is characterized in that, the change of the described correction coefficient of heat load of ature of coal manually or automatically completes.
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, when described being automatically performed completes the correction coefficient of heat load change of ature of coal, by ature of coal self-checking device
To change correction factor, to realize secondary air register baffle plate and become automatically controlling of ature of coal operating mode.
5. 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 maximum opening is determined by burner hearth-big bellows differential pressure minimum limit value.
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 |
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| CN104728857A CN104728857A (en) | 2015-06-24 |
| CN104728857B true CN104728857B (en) | 2017-03-08 |
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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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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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