CN204005958U - A kind of low NO of generating plant pulverized coal boiler - Google Patents
A kind of low NO of generating plant pulverized coal boiler Download PDFInfo
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- CN204005958U CN204005958U CN201420445093.4U CN201420445093U CN204005958U CN 204005958 U CN204005958 U CN 204005958U CN 201420445093 U CN201420445093 U CN 201420445093U CN 204005958 U CN204005958 U CN 204005958U
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- burner hearth
- air
- pulverized coal
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Abstract
The utility model proposes a kind of low NO of generating plant pulverized coal boiler, mainly comprise burner hearth, four jiaos of burner hearth arrange respectively wind snout one time, and lay respectively at the upper and lower overfire air port of wind snout one time, the axis line of a wind snout at burner hearth diagonal angle overlaps with burner hearth diagonal, the axis line of the overfire air port at burner hearth diagonal angle and burner hearth diagonal form angle, and angle is greater than zero degree, are also provided with the tertiary air spout that is positioned at overfire air port top.The utility model is in the situation that coal dust amount is certain, realize the classification supply of furnace air by overfire air port and tertiary air spout, distribute with the air capacity of controlling zones of different in stove, make coal dust in stove, in primary combustion zone, form reducing atmosphere, thereby suppress nitrogen oxide and generate total amount, in burner hearth, not clean-burning pulverized coal particle moves upward, relend the air that helps tertiary air spout supplementary, make coal dust realize completing combustion, the efficiency of combustion of boiler can be ensured, the total emission volumn of nitrogen oxidation can be reduced again.
Description
Technical field
The utility model relates to coal dust firing field, relates in particular to a kind of low NO of generating plant pulverized coal boiler.
Background technology
The existing generating plant pulverized coal boiler overwhelming majority adopts four jiaos of tangential firing technology, being breeze airflow introduces in burner hearth and burns from being arranged in the parallel flow burner of four jiaos, burner hearth, by the wind powder mixture co-operating at each angle, in stove, form coal dust suspension combustion, routine once, Secondary Air be interval arrange, the geometric center lines in each air port is all tangent with the imaginary circle separately at burner hearth center respectively.This mode can make coal dust fully completing combustion in burner hearth, thereby efficiency of combustion is high, generally applies at modern station boiler.But also there is some problems in this combustion system, due in primary combustion zone, the oxygen amount (air) that Secondary Air provides is more abundant, so coal dust combustion velocity in this region is very fast, can give off energy fast, efficiency of combustion is high, forms higher temperature in region, and the amount of nitrogen oxides simultaneously generating in combustion process is also many.Aspect current environmental protection, propose to control haze, reduce smoke pollution of boiler thing discharge capacity under the new situation, control degree and the effect of the total emission volumn of combustion system originally to reduction nitrogen oxide are not very good, still have improved space.
Utility model content
The NOx discharge capacity producing when reducing power boiler burning, the utility model object is to provide a kind of low NO of generating plant pulverized coal boiler.
The technical solution of the utility model is achieved in that
A kind of low NO of generating plant pulverized coal boiler, it mainly comprises burner hearth, four jiaos of described burner hearth arrange respectively wind snout one time, and lay respectively at a described upper and lower overfire air port of wind snout, the axis line of a wind snout at burner hearth diagonal angle overlaps with burner hearth diagonal, the axis line of the overfire air port at burner hearth diagonal angle and burner hearth diagonal form angle, and described angle is greater than zero degree, on described burner hearth, be also provided be positioned at described overfire air port top tertiary air spout.
As preferably, a described wind snout and described overfire air port distance are L1, and the distance of described overfire air port and described tertiary air spout is L2, wherein, and described L1* (10～15)=L2.
As preferably, coal dust enters in burner hearth by a wind snout, and four jiaos of wind center lines liquidate, and with burner hearth center superposition; Secondary Air enters freeze profile by overfire air port and becomes the Secondary Air imaginary circle taking burner hearth center as the center of circle, and tertiary air enters freeze profile by tertiary air spout and becomes the tertiary air imaginary circle taking burner hearth center as the center of circle.
As preferably, not etc., Secondary Air imaginary circle diameter is not less than tertiary air imaginary circle diameter for Secondary Air imaginary circle and tertiary air imaginary circle diameter.
As preferably, described Secondary Air imaginary circle direction and described tertiary air imaginary circle opposite direction.
As preferably, described angular range is 10～45 °.
The utility model compared with prior art, there is following advantage: the utility model is entering stove coal dust amount certain in the situation that, carry out the necessary air of classification supply coal dust firing by overfire air port and tertiary air spout, controlling the air capacity in zones of different in stove distributes, make coal dust firing in primary combustion zone in reducing atmosphere, generate total amount to reduce nitrogen oxide.Not clean-burning coal dust is at burner hearth inner suspension and move upward, then by the supplementary air of upper strata tertiary air spout, finally realizes the abundant burning of coal dust, has both ensured efficiency of combustion, has reduced again the total release of nitrogen oxide.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is that wind, Secondary Air, a tertiary air enter the view after burner hearth.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described.Obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
As shown in attached Fig. 1 and 2, the low NO of a kind of generating plant pulverized coal boiler described in the utility model, it can be multilayer setting, also can individual layer setting, when individual layer arranges, it mainly comprises burner hearth 1, four jiaos of described burner hearth 1 arrange respectively wind snout 2 one time, and lay respectively at the overfire air port 3 of described wind snout 2 both sides, the center line line of a wind snout 2 at burner hearth 1 diagonal angle liquidate and with burner hearth center superposition, the axis line of the overfire air port 3 at burner hearth 1 diagonal angle and burner hearth 1 diagonal form angle a, described angle a is greater than zero degree, described angle a scope is 10～45 °, on described burner hearth 1, be also provided be positioned at described overfire air port 3 tops tertiary air spout 4.
Breeze airflow enters in burner hearth from a described wind snout 2, and hot-air enters burner hearth from described overfire air port 3, provides coal dust firing necessary oxygen.A described wind snout 2 is L1 with described overfire air port 3 distances, described overfire air port 3 is L2 with the distance of described tertiary air spout 4, wherein, described L1* (10～15)=L2, can adjust by distance the burning time of the coal dust of different atures of coal, then control the growing amount of nitrogen oxide.
Breeze airflow enters in burner hearth 1 by a wind snout 2 of four jiaos, and four jiaos of wind center lines liquidate and form a wind imaginary circle 5, a described wind imaginary circle 5 and burner hearth center superposition; Secondary Air enters the Secondary Air imaginary circle 6 of the interior formation of burner hearth 1 taking burner hearth center, burner hearth center as the center of circle by overfire air port 3, and tertiary air enters the tertiary air imaginary circle 7 of the interior formation of burner hearth 1 taking burner hearth center, burner hearth center as the center of circle by tertiary air spout 4.Wherein, the Secondary Air imaginary circle 6 that Secondary Air forms is greater than wind imaginary circle 5 one time; So just make to form " bellows chamber powder " state between primary and secondary air, make combustion zone form anaerobic condition, reduced the temperature of combustion zone, produce reproducibility atmosphere, be conducive to control total growing amount of nitrogen oxide.Secondary Air imaginary circle 6 is different from tertiary air imaginary circle 7 diameter, and Secondary Air imaginary circle 6 diameters are less than tertiary air imaginary circle 7 diameters.
Described Secondary Air imaginary circle 6 directions and described tertiary air imaginary circle 7 opposite directions, because burner hearth 1 space is larger, the high temperature suspension air-flow of single direction can cause furnace exit temperature field distribution inhomogeneous, produce district of localized hyperthermia, when serious, affect the normal operation of boiler,, and by reciprocal tertiary air, can reduce the momentum of Secondary Air rotation, thus the uniform distribution of temperature field that burner hearth 1 is exported.
The utility model is entering stove coal dust amount certain in the situation that; realize air classification by overfire air port 3 and tertiary air spout 4; control the distribution of oxygen amount in zones of different in stove; make the interior coal dust of primary combustion zone in reducing atmosphere; reduce the temperature of primary combustion zone; formation of nitrogen oxides is reduced; not clean-burning coal dust moves upward; again by the supplementary air of tertiary air spout 4; coal dust is fully burnt, finally realize the abundant burning of coal dust, both ensured the efficiency of combustion of boiler; the total amount that has reduced again nitrogen oxide, is conducive to environmental protection.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.
Claims (6)
1. the low NO of a generating plant pulverized coal boiler, it is characterized in that: it mainly comprises burner hearth (1), four jiaos of described burner hearth (1) arrange respectively a wind snout (2), and lay respectively at the upper and lower overfire air port (3) of a described wind snout (2), the axis line of a wind snout (2) at burner hearth (1) diagonal angle overlaps with burner hearth (1) diagonal, the axis line of the overfire air port (3) at burner hearth (1) diagonal angle and burner hearth (1) diagonal form angle (a), described angle (a) is greater than zero degree, on described burner hearth (1), be also provided be positioned at described overfire air port (3) top tertiary air spout (4).
2. the low NO of a kind of generating plant pulverized coal boiler according to claim 1, it is characterized in that: a described wind snout (2) is L1 with described overfire air port (3) distance, described overfire air port (3) is L2 with the distance of described tertiary air spout (4), wherein, described L1* (10～15)=L2.
3. according to the low NO of a kind of generating plant pulverized coal boiler described in claim 1 or 2, it is characterized in that: coal dust enters in burner hearth (1) by a wind snout (2) of four jiaos, four jiaos of wind center lines liquidate, and with burner hearth center superposition; Secondary Air is entered in burner hearth (1) and is formed the Secondary Air imaginary circle (6) taking burner hearth center as the center of circle by overfire air port (3), and tertiary air enters the tertiary air imaginary circle (7) of formation taking burner hearth center as the center of circle in burner hearth (1) by tertiary air spout (4).
4. the low NO of a kind of generating plant pulverized coal boiler according to claim 3, it is characterized in that: Secondary Air imaginary circle (6) differs in size with tertiary air imaginary circle (7), and Secondary Air imaginary circle (6) diameter is less than tertiary air imaginary circle (7) diameter.
5. the low NO of a kind of generating plant pulverized coal boiler according to claim 3, is characterized in that: described Secondary Air imaginary circle (6) direction and described tertiary air imaginary circle (7) opposite direction.
6. according to the low NO of a kind of generating plant pulverized coal boiler described in claim 4 or 5, it is characterized in that: described angle (a) scope is 10 °～45 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420445093.4U CN204005958U (en) | 2014-08-07 | 2014-08-07 | A kind of low NO of generating plant pulverized coal boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420445093.4U CN204005958U (en) | 2014-08-07 | 2014-08-07 | A kind of low NO of generating plant pulverized coal boiler |
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| CN204005958U true CN204005958U (en) | 2014-12-10 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823079A (en) * | 2016-04-11 | 2016-08-03 | 中国神华能源股份有限公司 | Air distribution method of oxygen-enriched combustion boiler |
| CN107289445A (en) * | 2017-06-12 | 2017-10-24 | 沈阳化工大学 | A kind of device for improving boiler of power plant fuel value |
| CN108105782A (en) * | 2017-12-08 | 2018-06-01 | 长兴新城环保有限公司 | A kind of fluidized bed refuse incinerator |
| CN108592041A (en) * | 2018-04-28 | 2018-09-28 | 光大环保技术研究院（深圳）有限公司 | A kind of air distribution device and waste incinerator of flue gas |
-
2014
- 2014-08-07 CN CN201420445093.4U patent/CN204005958U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105823079A (en) * | 2016-04-11 | 2016-08-03 | 中国神华能源股份有限公司 | Air distribution method of oxygen-enriched combustion boiler |
| CN107289445A (en) * | 2017-06-12 | 2017-10-24 | 沈阳化工大学 | A kind of device for improving boiler of power plant fuel value |
| CN107289445B (en) * | 2017-06-12 | 2020-06-30 | 沈阳化工大学 | Device for improving combustion value of power plant boiler |
| CN108105782A (en) * | 2017-12-08 | 2018-06-01 | 长兴新城环保有限公司 | A kind of fluidized bed refuse incinerator |
| CN108592041A (en) * | 2018-04-28 | 2018-09-28 | 光大环保技术研究院（深圳）有限公司 | A kind of air distribution device and waste incinerator of flue gas |
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