CN207065551U - A kind of π type gas fired-boilers using Secondary Air technology - Google Patents
A kind of π type gas fired-boilers using Secondary Air technology Download PDFInfo
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- CN207065551U CN207065551U CN201721030043.XU CN201721030043U CN207065551U CN 207065551 U CN207065551 U CN 207065551U CN 201721030043 U CN201721030043 U CN 201721030043U CN 207065551 U CN207065551 U CN 207065551U
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Abstract
It the utility model is related to a kind of π type gas fired-boilers using Secondary Air technology, main body includes burner hearth and gas burner, burner hearth includes the front wall provided with gas burner and Secondary Air laying area, the left and right side wall for being provided with Secondary Air laying area and the interior furnace chamber provided with primary zone, reburning zone, burnt zone and Secondary Air active region, each Secondary Air and lays in area and be provided with some overfire air ports.During work, 70% 95% combustion air enters primary zone by gas burner, fuel is set to be burnt in anaerobic environment, 5% 30% combustion air is sent into by overfire air port, former fuel not sufficiently combusted in primary zone is set to be burnt away in the reburning zone of Secondary Air active region middle and lower part, the NOx originally generated is set further to reduce, burnt zone is finally entered to burn away to after-flame, solving Secondary Air technology for a long time can not be effective for a great problem on π type boilers, both to have good drop nitrogen effect, and can makes boiler reach the Secondary Air technology of discharge standard to refer on π type boilers and opened up successful precedent.
Description
Technical field
It the utility model is related to technical field of boiler combustion, particularly a kind of π type gas fired-boilers using Secondary Air technology.
Background technology
The problem that pollution of the gas fired-boiler discharge gas to air ambient is current industry common concern is reduced as far as possible, is
Ensure the quality of surrounding air, relevant functional departments are all trying to explore, adopted an effective measure, and formulated corresponding restriction
Property environmental protection standard, and with measure implement and technique effect steps up, constantly corresponding improve standard, Beijing at present
That area is carrying out is NOx emission 30mg/Nm3Newest standards.Air classification technology is that a kind of generally acknowledged comparison of current industry has
The low nitrogen burning mode of effect, take at gas burner head by air be divided into form that multiply is passed through send to burner it is combustion-supporting
Air, there is certain effect to the discharge for reducing NOx.But it is limited to find that it drops nitrogen effect in practice, it is difficult to reaches 30mg/Nm3
Discharge standard.Therefore, to have explored a kind of entirety supplied gas in whole gas fired-boiler with air classification again deep or light for industry
Combustion technology, also known as Secondary Air technology.Its main points is arranged in Secondary Air at the correct position away from burner certain distance, is made
Can ensure that card fuel abundant burning, and the flue-gas temperature of boiler furnace outlet with increase Secondary Air before compared with will not rise
It is high too many, and certain drop nitrogen effect can also be played, there is certain actual effect.But in practice, it has been found that although it has certain drop
Nitrogen effect, but applicable surface is limited, be especially not suitable for boiler furnace sectional area is larger, the absolute altitude of the superiors' burner arrangement away from
On the nearer π type boilers of furnace outlet.But π type boilers are most widely used a kind of type of furnaces in current electric power station system, so,
How both having a good drop nitrogen effect, and can ensures that boiler reaches the Secondary Air technology of discharge standard and referred on π type boilers,
With highly important positive effect.
The content of the invention
The purpose of this utility model is that the Secondary Air technology that overcome existing overall bias combustion is not suitable for boiler furnace
Sectional area is larger, the absolute altitude of the superiors' burner arrangement is away from the deficiency on the nearer π type boilers of furnace outlet, there is provided a kind of structure
It is novel, rationally distributed, be advantageous to further reduce NOx initial ejection and reach NOx to be less than 30mg/Nm3It is ultralow nitrogen discharged
The π type gas fired-boilers using Secondary Air technology of standard.
π type gas fired-boilers of the present utility model using Secondary Air technology, main body include boiler furnace and several combustion gas
Burner, it is characterised by that described boiler furnace includes front wall, left and right side wall, Hou Qiang and Nei provided with primary zone, reburning zone, combustion
Cinder area and the furnace chamber of Secondary Air active region, described gas burner stratose are arranged on front wall, and its throat diameter is d, comprising
There are the superiors' burner and some lower floor's burners, wherein：
Area is laid by the front wall Secondary Air being arranged on front wall and is arranged on the side wall of left and right in described Secondary Air active region
Side wall Secondary Air lay area between furnace cavity form；
Described front wall Secondary Air lays area and is laid in the center absolute altitude of the superiors' burner and away from the superiors' burner
On front wall on the absolute altitude of center between 10d in region；
Described side wall Secondary Air is laid area and is laid in front wall after being d, and is burnt in height away from the superiors
The center absolute altitude of device is on the left and right side wall under 10d；
Described front wall Secondary Air lays area and side wall Secondary Air is laid regular respectively in area or irregularly presses a floor
Or multilayer, the structure formula individual per the number of plies are provided with some overfire air ports；
Described primary zone include by front wall be that left and right side wall within d limits space apart from front wall, and with institute
The corresponding lower furnace portion space of lower floor's burner for stating；
Described reburning zone positioned at Secondary Air active region middle and lower part and the handing-over space adjacent with primary zone by forming；
Described burnt zone is made up of the upper furnace space between the top of Secondary Air active region 17 and furnace outlet；
It is symmetricly set in addition, described side wall Secondary Air lays area on the side wall of left and right；
During work, the combustion air needed for gas fired-boiler is divided into two-stage and is sent into burner hearth, one is 70%-95% combustion air
Primary zone is entered by gas burner, makes the excess air coefficient in primary zone between 0.7- 1, thus is in fuel
Burnt in anaerobic environment, cause burning velocity slowly, ignition temperature it is not high, simultaneously as reproducibility atmosphere of the fuel in anoxic
Middle burning, substantial amounts of nitrogen-containing group is reacted with NOx, improve NOx to N2Conversion ratio, so as to inhibit NOx generation, have
Beneficial to growing amounts of the reduction NOx in primary zone；The second is remaining 5%-30% combustion air by be arranged at boiler front wall and
Overfire air port on the side wall of left and right is sent into burner hearth, in freeze profile into Secondary Air active region, makes not fill in primary zone originally
The fuel of divided combustion first burns away in the reburning zone near the middle and lower part of Secondary Air active region, and makes originally in primary zone
The NOx of interior generation is further reduced, and is then entered back into positioned at Secondary Air active region top to the burnt zone between furnace outlet area
Inside burn away, until after-flame；Although close to furnace outlet, inner air amount is sufficient, fuel energy is fully fired for burnt zone
To the greatest extent, but flame temperature is relatively low, so final NOx generation amount is little, and because unburned fuel before can obtain abundant after-flame,
Therefore CO yield is almost nil, the flue gas mass and temperature rise that can ensure that burner hearth discharge are in standard allowed band.
The utility model based on above-mentioned design uses the π type gas fired-boilers of Secondary Air technology, two due to proper citation
Secondary wind technology, Secondary Air active region is established in burner hearth, and section has been carried out to the primary zone in burner hearth, reburning zone and burnt zone
Learn and reasonably configure, ensure that Secondary Air technology is quoted from structure and its overall deep or light combustion is given full play on π type gas fired-boilers
Burn positive technique effect, make the NOx generation amount of π type gas fired-boilers reduce 30~60%, at the same also bring slow down burning,
Reduce ignition temperature, manufactured NOx reproducibility atmosphere, effectively inhibit thermal NO x and fuel type NOx generation, simultaneously
The concentration impact for avoiding Secondary Air to burning is also relaxed, makes flameholding, reduces what boiler shook by combustion instability
Possibility.Therefore the utility model realizes the initial of reduction NOx conscientiously using the π types gas fired-boiler of Secondary Air technology
Discharge and reach NOx and be less than 30mg/Nm3Ultralow nitrogen discharged standard purpose of utility model, solve and perplex industry for a long time
The Secondary Air technology of the overall bias combustion on boundary can not be effective for a great problem on π type boilers, technology of the present utility model
Scenario-frame rationally and science, both to have good drop nitrogen effect, and can to ensure that boiler reached the Secondary Air technology of discharge standard
Refer in current electric power station system and opened up successful precedent on most widely used π types boiler, hence it is evident that there is very strong practicality
With wide market application foreground.
Brief description of the drawings
Fig. 1 is the basic structure schematic diagram of the utility model embodiment；
Fig. 2 is A-A sectional views in Fig. 1；
Fig. 3 is D-D sectional views in Fig. 1.
In figure：
1. the primary zone of wall 14. after the side wall 13. of 11. front wall of boiler furnace 12. or so
15. the front wall Secondary Air of 16. burnt zone of reburning zone, 17. Secondary Air active region 171. lays area
172. side wall Secondary Airs lay the superiors' burner of 2. gas burner of area 21.
The overfire air port of 22. lower floor's burner of center absolute altitude 3. of 211. the superiors' burners.
Embodiment
The utility model is described in further detail with exemplary embodiments below in conjunction with the accompanying drawings.
In Fig. 1, Fig. 2 and Fig. 3, the π type gas fired-boilers of the present utility model using Secondary Air technology, main body includes pot
The gas burner 2 that stove burner hearth 1 and several stratoses are set, is characterised by：Described boiler furnace 1 includes front wall 11, left and right
Side wall 12, rear wall 13 and the interior furnace chamber provided with primary zone 14, reburning zone 15, burnt zone 16 and Secondary Air active region 17, it is described
The stratose of gas burner 2 is arranged on front wall 11, and its throat diameter is d, includes the superiors' burner 21 and the combustion of some lower floors
Burner 22, wherein：
Area 171 is laid by the front wall Secondary Air being arranged on front wall 11 and is arranged on left and right in described Secondary Air active region 17
The furnace cavity that side wall Secondary Air on side wall 12 is laid between area 172 is formed；
Described front wall Secondary Air lays area 171 and is laid in the center absolute altitude 211 of the superiors' burner 21 and away from the superiors
On front wall 11 on the center absolute altitude 211 of burner 21 between 10d in region；
Described side wall Secondary Air is laid area 172 and is laid in front wall 11 after for d, and away from the superiors in height
The center absolute altitude 211 of burner 21 is on the left and right side wall 12 under 10d；
Described front wall Secondary Air lays area 171 and side wall Secondary Air lay it is regular respectively in area 172 or irregularly
By one or more layers, often the structure formula of the number of plies is provided with some overfire air ports 3；
Described primary zone 14 includes by front wall 11 with limiting space apart from front wall for the left and right side wall 12 within d,
The corresponding lower furnace portion space with described lower floor's burner 22；
Described reburning zone 15 is by positioned at the middle and lower part of Secondary Air active region 17 and the handing-over space structure adjacent with primary zone 14
Into；
Described burnt zone 16 is made up of the upper furnace space between the top of Secondary Air active region 17 and furnace outlet；
It is symmetricly set in addition, described side wall Secondary Air lays area 172 on left and right side wall 12；
During work, the combustion air needed for gas fired-boiler is divided into two-stage and is sent into burner hearth, one is 70%-95% combustion air
Primary zone is entered by gas burner 2, makes the excess air coefficient in primary zone between 0.7-1, thus is made at fuel
Burnt in anaerobic environment, cause burning velocity slowly, ignition temperature it is not high, simultaneously as reproducibility atmosphere of the fuel in anoxic
Middle burning is enclosed, substantial amounts of nitrogen-containing group is reacted with NOx, improves NOx to N2Conversion ratio, so as to inhibit NOx generation,
Advantageously reduce growing amounts of the NOx in primary zone；The second is remaining 5%-30% combustion air is by being arranged at boiler front wall
11 and left and right side wall 12 on overfire air port 3 be sent into burner hearth, in freeze profile into Secondary Air active region 17, make originally in main combustion
Not sufficiently combusted fuel first burns away in the reburning zone 15 near the middle and lower part of Secondary Air active region 17 in area 14, and
The NOx of the originally generation in primary zone 14 is further reduced, then enter back into positioned at the top of Secondary Air active region 17 to burner hearth
Burnt away in burnt zone 16 between outlet area, until after-flame；Although burnt zone is filled close to furnace outlet, inner air amount
Foot, makes fuel energy obtain abundant after-flame, but flame temperature is relatively low, so final NOx generation amount is little, and due to unburned before
Fuel energy obtain abundant after-flame, therefore CO yield is almost nil, and the flue gas mass and temperature rise that can ensure that burner hearth discharge are in
Standard allowed band.
Claims (1)
1. a kind of π type gas fired-boilers using Secondary Air technology, main body includes boiler furnace（1）With several gas burners
（2）, it is characterised by described boiler furnace（1）Include front wall（11）, left and right side wall（12）, rear wall（13）Main combustion is provided with interior
Area（14）, reburning zone（15）, burnt zone（16）With Secondary Air active region（17）Furnace chamber, described gas burner（2）Stratose
It is arranged on front wall（11）On, its throat diameter is d, includes the superiors' burner（21）With some lower floor's burners（22）, its
In：
Described Secondary Air active region（17）By being arranged on front wall（11）On front wall Secondary Air lay area（171）Be arranged on a left side
Right-side wall（12）On side wall Secondary Air lay area（172）Between furnace cavity form；
Described front wall Secondary Air lays area（171）It is laid in the superiors' burner（21）Center absolute altitude（211）With away from most upper
Layer burner（21）Center absolute altitude（211）On front wall between 10d in region（11）On；
Described side wall Secondary Air lays area（172）It is laid in and front wall（11）After distance is d, and away from the superiors in height
Burner（21）Center absolute altitude（211）For the left and right side wall under 10d（12）On；
Described front wall Secondary Air lays area（171）Area is laid with side wall Secondary Air（172）Upper difference is regular or irregularly
By one or more layers, often the structure formula of the number of plies is provided with some overfire air ports（3）；
Described primary zone（14）Include by front wall（11）With being the left and right side wall within d apart from front wall（12）Restriction it is empty
Between, and with described lower floor's burner（22）Corresponding lower furnace portion space；
Described reburning zone（15）By positioned at Secondary Air active region（17）Middle and lower part and and primary zone（14）Adjacent handing-over space
Form；
Described burnt zone（16）By positioned at Secondary Air active region（17）Upper furnace space between top and furnace outlet is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721030043.XU CN207065551U (en) | 2017-08-17 | 2017-08-17 | A kind of π type gas fired-boilers using Secondary Air technology |
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| CN201721030043.XU CN207065551U (en) | 2017-08-17 | 2017-08-17 | A kind of π type gas fired-boilers using Secondary Air technology |
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| CN207065551U true CN207065551U (en) | 2018-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314366A (en) * | 2017-08-17 | 2017-11-03 | 上海华之邦科技股份有限公司 | A kind of π type gas fired-boilers of use Secondary Air technology |
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2017
- 2017-08-17 CN CN201721030043.XU patent/CN207065551U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314366A (en) * | 2017-08-17 | 2017-11-03 | 上海华之邦科技股份有限公司 | A kind of π type gas fired-boilers of use Secondary Air technology |
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