CN215294892U - Over-fire air nozzle and gas boiler - Google Patents
Over-fire air nozzle and gas boiler Download PDFInfo
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- CN215294892U CN215294892U CN202120380527.7U CN202120380527U CN215294892U CN 215294892 U CN215294892 U CN 215294892U CN 202120380527 U CN202120380527 U CN 202120380527U CN 215294892 U CN215294892 U CN 215294892U
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Abstract
The utility model provides an after-fire air spout and gas boiler, the after-fire air spout includes: the nozzle comprises a first nozzle orifice, a second nozzle orifice and a third nozzle orifice, wherein the first nozzle orifice and the third nozzle orifice are respectively positioned on two opposite sides of the second nozzle orifice, and the orientation of the first nozzle orifice, the orientation of the second nozzle orifice and the orientation of the third nozzle orifice are different. The utility model discloses an over fire air spout includes first spout, second spout and the third spout that the orientation is different, works as when the over fire air spout is used for gas boiler, the regional department of single over fire air spout, the over fire air can spout into the combustion chamber from a plurality of directions, has changed the current situation that the over fire air in the single over fire air spout spouts into the combustion chamber from single direction, has reduced the problem that the over fire air stays the time fluctuation because of the flue gas velocity change that the boiler operation load difference caused, has guaranteed the low nitrogen effect of over fire air.
Description
Technical Field
The utility model relates to a gas boiler ultralow nitrogen combustion technical field especially relates to an after-fire air spout and gas boiler.
Background
Energy conservation and emission reduction are still the subjects of the modern times, the over-fire air technology can effectively control the generation of thermal NOx and fuel NOx, has the advantages of low early investment and low operating cost, and has been successfully applied to a gas-fired boiler from a coal-fired boiler. The over-fire air technology changes the working condition that all combustion-supporting air enters from the throat of a burner on the traditional gas boiler, so that a part of the rest air enters from the downstream of the flue gas flow in the combustion chamber, the atmosphere of total thick and thin combustion is produced in the combustion chamber, and the emission of NOx is reduced.
The existing over-fire air technology is applied to a gas boiler, plays an important role in reducing the emission of nitrogen oxides, and can be widely applied to various gas fuels (such as natural gas, liquefied petroleum gas, carbon black tail gas, semi-coke tail gas and the like) and various furnace types (such as a pi-shaped furnace, a D-shaped furnace and a fire tube furnace).
The nitrogen reduction effect of the overfire air depends on the arrangement of the overfire air. When the boiler is operated, the load is high and low, the boiler is generally operated at 30% -110% load, namely the flue gas amount in the boiler is greatly changed, the furnace section and the height of a specific boiler are not changed, so the flue gas flow rate is gradually increased along with the increase of the boiler load. Therefore, for the same boiler with the over-fire air, when the loads of different boilers are operated, the retention time of the flue gas between the combustor and the over-fire air is gradually reduced along with the increase of the operating load of the boiler, so that the denitrification effect of the over-fire air is influenced. At present, the arrangement modes of the over-fire air are various, such as four corner tangential arrangement, arrangement of two side walls of a front wall and the like, but the over-fire air nozzles are mostly horizontally arranged, namely, the direction of the air flow ejected by the single over-fire air is more vertical to the direction of the flue gas flow. In patent 201820460841.4 and patent 201820142468.8, the overfire air nozzle can swing left and right or up and down, but the single overfire air nozzle can spray air flow from a single direction basically (or vertical to the flue gas flow direction, or inclined downward direction from the flue gas flow, or inclined upward direction from the flue gas flow) when the single overfire air nozzle operates under a specific working condition.
Therefore, the structural form of the over-fire air nozzle is innovated, the problem of over-fire air retention time fluctuation caused by flue gas flow velocity change of over-fire air due to different operation loads of the boiler is solved, the denitrification effect of the over-fire air is ensured, and the over-fire air nozzle has important significance.
SUMMERY OF THE UTILITY MODEL
In order to achieve the above and other related objects, the present invention provides an over fire air nozzle and a gas boiler for solving the above problems of the gas boiler in the prior art.
The utility model provides an over fire air spout, include: a first nozzle orifice, a second nozzle orifice, and a third nozzle orifice, wherein,
the first nozzle orifice and the third nozzle orifice are respectively positioned on two opposite sides of the second nozzle orifice, and the orientation of the first nozzle orifice, the orientation of the second nozzle orifice and the orientation of the third nozzle orifice are different.
Optionally, the overfire air nozzle further comprises an overfire air main channel, and the overfire air main channel is connected with the first nozzle, the second nozzle and the third nozzle.
Optionally, the orientation of the first nozzle, the orientation of the second nozzle, and the orientation of the third nozzle are different from each other, the central axis of the first nozzle and the central axis of the third nozzle are oblique to the central axis of the second nozzle in the over-fire air main channel, so that over-fire air in a single nozzle is respectively sprayed into the combustion chamber from a plurality of different directions in the obliquely downward direction of flue gas flow, the obliquely upward direction of flue gas flow, and the obliquely downward direction of flue gas flow.
The utility model also provides a gas boiler, include: the combustion chamber comprises a main combustion area, a reburning area and a burnout area, wherein the main combustion area, the reburning area and the burnout area are sequentially arranged along the flow direction of a flue gas flow;
the burner is positioned on the furnace wall of the main combustion zone;
the overfire air nozzle is positioned on the furnace wall of the overfire area.
Optionally, the number of the burners is multiple, and the multiple burners are arranged at intervals.
Optionally, the overfire air nozzles are multiple and arranged in a single layer.
Optionally, the overfire air nozzles are multiple and arranged in multiple layers.
Optionally, each tier comprises a plurality of the over fire air jets.
Optionally, the burner is connected to a combustion air source and a fuel source, and the over fire air nozzle is connected to the combustion air source.
As above, the utility model discloses an after-fire air spout and gas boiler have following beneficial effect: the utility model discloses an after-fire air spout includes the different first spout, second spout and the third spout of orientation, works as when the after-fire air spout is used for gas boiler, the regional department of single after-fire air spout, the after-fire air can spout into the combustion chamber from a plurality of directions (for example, flue gas flows the oblique downward direction, perpendicular to flue gas flow direction, flue gas flow direction is upwards to one side), the current situation in the combustion chamber is spouted into from single direction to the after-fire air in the single after-fire air spout has been changed, the problem that the after-fire air dwell time that changes and bring because of the different flue gas velocity of flow that cause of boiler operational load is reduced, the low nitrogen effect of after-fire air has been guaranteed.
Drawings
Fig. 1 is a schematic structural view of an over fire air nozzle provided in a first embodiment of the present invention; fig. 1 (a) is a schematic cross-sectional structure view of the overfire air nozzle, and fig. 1 (b) is a right side view of the overfire air nozzle in the direction a.
Fig. 2 is a schematic structural view of a gas boiler provided in the second embodiment of the present invention.
Fig. 3 is a schematic view of a relative relationship between a single overfire air nozzle overfire air spraying direction in the gas boiler and a flue gas flow direction in the boiler provided in the second embodiment of the present invention.
Element number description: 1. the device comprises a combustion chamber, 11, a main combustion area, 12, a reburning area, 13, an overfire area, 2, a combustor, 3, overfire air nozzles, 31, an overfire air main channel, 321, first nozzles, 322, second nozzles and 323 third nozzles.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.
Example one
Referring to fig. 1, the present embodiment provides an overfire air nozzle 3, where the overfire air nozzle 3 includes: a first nozzle 321, a second nozzle 322, and a third nozzle 323, wherein,
the first nozzle orifice 321 and the third nozzle orifice 323 are respectively positioned at two opposite sides of the second nozzle orifice 322, and the orientation of the first nozzle orifice 21, the orientation of the second nozzle orifice 322 and the orientation of the third nozzle orifice 323 are different.
As an example, the orientation of the first nozzle orifice 21, the orientation of the second nozzle orifice 322, and the orientation of the third nozzle orifice 323 may be partially the same or different from each other, and preferably, the orientation of the first nozzle orifice 21, the orientation of the second nozzle orifice 322, and the orientation of the third nozzle orifice 323 are different from each other.
As an example, the overfire air nozzle 3 further comprises an overfire air main channel 31, and the overfire air main channel 31 is connected with the first nozzle 321, the second nozzle 322 and the third nozzle 323. Namely, the overfire air nozzle 3 includes the main overfire air passage 31 at the front end and the first nozzle 321, the second nozzle 322 and the third nozzle 323 at the rear end.
As an example, more specifically, the orientation of the first nozzle 321, the orientation of the second nozzle 322, and the orientation of the third nozzle 323 are different from each other, and the central axis of the first nozzle 321 and the central axis of the third nozzle 323 are both oblique to the central axis of the second nozzle 322 in the over-fire air main channel 31, so that the over-fire air in the single-nozzle is injected into the combustion chamber from a plurality of different directions, i.e., an obliquely downward direction of the flue gas flow, a direction perpendicular to the flue gas flow, and an obliquely upward direction of the flue gas flow.
As an example, as shown in fig. 1, the first nozzle 321, the second nozzle 322, and the third nozzle 323 may be sequentially arranged from top to bottom, where the first nozzle 321 is an upper nozzle, the second nozzle 322 is a middle nozzle, and the third nozzle 323 is a lower nozzle; the second nozzle hole 322 is horizontally disposed, the first nozzle hole 321 is oriented in an obliquely upward direction, and the third nozzle hole 323 is oriented in an obliquely downward direction.
The utility model discloses an overfire air spout 3 includes first spout 321, second spout 322 and the third spout 323 that the orientation is different, works as when overfire air spout 3 is used for gas boiler, single 3 regional departments of overfire air spout, the overfire air can spout into the combustion chamber from a plurality of directions (for example, flue gas flows the oblique downward direction, perpendicular to flue gas flow direction, flue gas flow direction incline upward), the current situation in the combustion chamber is spouted into from single direction to the overfire air in having changed single 3 of overfire air spout, the undulant problem of overfire air dwell time that the change of flue gas velocity of flow that has reduced the overfire air and has brought because of the boiler operational load difference has guaranteed the low nitrogen effect of overfire air.
Example two
Referring to fig. 2 to 3 in conjunction with fig. 1, the present embodiment provides a gas boiler, including: the combustion chamber 1 comprises a main combustion zone 11, a reburning zone 12 and a burnout zone 13, wherein the main combustion zone 11, the reburning zone 12 and the burnout zone 13 are sequentially arranged along the flowing direction of a flue gas flow; the burner 2 is positioned on the wall of the main combustion zone 11; the overfire air nozzle 3 is as described in the first embodiment, and the overfire air nozzle 3 is positioned on the wall of the overfire zone 13. The direction of the dashed arrow in fig. 2 is the flow direction of the flue gas flow.
Specifically, the burner 2 is located upstream of the flue gas flow, and the overfire air nozzle 3 is located downstream of the flue gas flow. The combustion chamber 1 is a space where a gas fuel is burned, and may have various structures. Fig. 1 is merely an example of a combustion chamber of a pi-type furnace.
As an example, the second nozzle 322 is oriented perpendicular to the flow direction of the flue gas flow, and the first nozzle 321 and the third nozzle 323 are both oriented obliquely to the flow direction of the flue gas flow.
As an example, the third nozzle holes 323 face the reburning zone 12, and the first nozzle holes 321 face away from the reburning zone 12.
Specifically, the overfire air in the single overfire air nozzle 3 is injected into the combustion chamber 1 from the obliquely downward direction of the flue gas flow, the obliquely upward direction of the flue gas flow perpendicular to the flue gas flow direction, respectively.
As an example, the overfire air nozzle 3 further comprises an overfire air main channel 31, and the overfire air main channel 31 is connected with one ends of the first nozzle 321, the second nozzle 322 and the third nozzle 323, which are far away from the flue gas flow.
As an example, the number of the burners 2 may be set according to actual needs, the number of the burners 2 may be one, or may be multiple, such as 2, 3, 4, 5, 6, or even more, and the multiple burners 2 are arranged at intervals.
Specifically, the burner 2 may be disposed at any position on the furnace wall upstream of the flue gas flow of the burner 2, and specifically, the burner 2 may be disposed at both side walls, a front wall, a rear wall, four corners, or a furnace ceiling of the burner 2.
In an example, the number of the over fire air nozzles 3 may be set according to actual needs, the number of the over fire air nozzles 3 may be one, or may be multiple, such as 2, 4, 6, 8 or even more, and the multiple over fire air nozzles 3 may be arranged in a single layer.
In another example, the number of the over-fire air nozzles 3 may be multiple, and the multiple over-fire air nozzles 3 may be arranged in multiple layers.
As an example, when the over-fire air nozzles 3 are arranged in multiple layers, each layer may include a plurality of over-fire air nozzles 3.
Specifically, the flow area of a single over-fire air nozzle 3 is divided to form a third nozzle 323, a second nozzle 322 and a first nozzle 321, so that over-fire air in the single over-fire air nozzle 3 is respectively sprayed into the combustion chamber 1 from a flue gas flow obliquely downward direction, a flue gas flow direction perpendicular to the flue gas flow direction and an obliquely upward direction of the flue gas flow direction, as shown in fig. 3, over-fire air in the single over-fire air nozzle 3 is sprayed from different directions, and the retention time of the over-fire air is adjusted. The residence time of the over-fire air can be properly reduced when the over-fire air is injected obliquely downwards in the low load state, and the residence time of the over-fire air can be properly increased when the over-fire air is injected obliquely upwards in the high load state.
As an example, the burner 2 may be connected to a combustion air source and a fuel source, and the over-fire air jets 3 are connected to the combustion air source. Combustion air required for gas combustion enters the combustion chamber 1 from the throat of the burner 2, and the rest enters the combustion chamber 2 from the over-fire air nozzle 3.
When the system works, part of combustion air is fed from the combustor 2, all fuel is fed from the combustor 2, and the fuel is incompletely combusted in the main combustion zone 11 to generate a reducing intermediate product and a reducing atmosphere, so that the generation of thermal NOx and fuel NOx is reduced, and the emission of NOx is reduced; the incompletely combusted gas mixture enters the reburning zone 12, and the hydrocarbon radicals CHi generated by combustion in the main burning zone 11 and incompletely combusted products CO, H2, C, CnHm and the like are utilized to reduce NO into N2, so that the generation of NOx is further reduced; the incompletely combusted flue gas enters the burnout zone 13 and completely combusts when encountering the rest of air sprayed from the burnout air nozzle 3 in the obliquely downward direction, the obliquely upward direction perpendicular to the flue gas flow direction and the flue gas flow direction respectively, so that the efficiency of the boiler is ensured. The single overfire air nozzle 3 can be sprayed from the lower direction, the middle direction and the upper direction, so that the influence on the retention time of the overfire air caused by the load change during the operation of the boiler can be resisted, and the low-nitrogen effect of the overfire air is ensured. The utility model adopts the idea of integral shade burning, can be applied to different gas furnace types and different over fire air arrangement modes, and has wide application range.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
1. An over-fire air nozzle, comprising: a first nozzle orifice, a second nozzle orifice, and a third nozzle orifice, wherein,
the first nozzle orifice and the third nozzle orifice are respectively positioned on two opposite sides of the second nozzle orifice, and the orientation of the first nozzle orifice, the orientation of the second nozzle orifice and the orientation of the third nozzle orifice are different.
2. The over-fire air nozzle as claimed in claim 1, wherein: the over-fire air nozzle further comprises an over-fire air main channel, and the over-fire air main channel is connected with the first nozzle, the second nozzle and the third nozzle.
3. The over-fire air nozzle of claim 2, wherein: the orientation of the first nozzle, the orientation of the second nozzle and the orientation of the third nozzle are different from each other, and the central axis of the first nozzle and the central axis of the third nozzle are oblique to each other in the over-fire air main channel.
4. A gas boiler, characterized by comprising:
the combustion chamber comprises a main combustion area, a reburning area and a burnout area, wherein the main combustion area, the reburning area and the burnout area are sequentially arranged along the flow direction of a flue gas flow;
the burner is positioned on the furnace wall of the main combustion zone;
the overfire air nozzle of any of claims 1 to 3, located on a wall of said overfire zone.
5. The gas boiler according to claim 4, characterized in that: the number of the burners is multiple, and the plurality of burners are arranged at intervals.
6. The gas boiler according to claim 4, characterized in that: the overfire air nozzles are arranged in a single layer.
7. The gas boiler according to claim 4, characterized in that: the overfire air nozzles are arranged in a plurality of layers.
8. The gas boiler of claim 7, wherein: each layer comprises a plurality of over-fire air nozzles.
9. The gas boiler according to claim 4, characterized in that: the combustor is connected with a combustion-supporting air source and a fuel source, and the over-fire air nozzle is connected with the combustion-supporting air source.
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| CN202120380527.7U CN215294892U (en) | 2021-02-20 | 2021-02-20 | Over-fire air nozzle and gas boiler |
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| CN202120380527.7U CN215294892U (en) | 2021-02-20 | 2021-02-20 | Over-fire air nozzle and gas boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031205A (en) * | 2024-02-28 | 2024-05-14 | 绍兴上虞杭协热电有限公司 | Circulating fluidized bed boiler |
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2021
- 2021-02-20 CN CN202120380527.7U patent/CN215294892U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118031205A (en) * | 2024-02-28 | 2024-05-14 | 绍兴上虞杭协热电有限公司 | Circulating fluidized bed boiler |
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