CN203907595U - Boiler - Google Patents
Boiler Download PDFInfo
- Publication number
- CN203907595U CN203907595U CN201420312513.1U CN201420312513U CN203907595U CN 203907595 U CN203907595 U CN 203907595U CN 201420312513 U CN201420312513 U CN 201420312513U CN 203907595 U CN203907595 U CN 203907595U
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- Prior art keywords
- flame wind
- wind snout
- flame
- boiler
- main burner
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- 210000004894 snout Anatomy 0.000 claims description 211
- 230000000694 effects Effects 0.000 claims description 12
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 30
- 239000003546 flue gas Substances 0.000 abstract description 30
- 238000002485 combustion reaction Methods 0.000 abstract description 29
- 239000003245 coal Substances 0.000 abstract description 21
- 230000001603 reducing effect Effects 0.000 abstract description 15
- 230000000630 rising effect Effects 0.000 abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 239000000843 powder Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 15
- 238000010304 firing Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 239000002817 coal dust Substances 0.000 description 10
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 8
- 238000010586 diagram Methods 0.000 description 8
- 239000007921 spray Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 239000013067 intermediate product Substances 0.000 description 4
- 241000143973 Libytheinae Species 0.000 description 3
- 230000000712 assembly Effects 0.000 description 3
- 238000000429 assembly Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000003916 acid precipitation Methods 0.000 description 1
- -1 by burner Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a boiler and relates to the technical field of pulverized coal fired boiler low-nitrogen combustion, and the boiler can be used for solving the problem that the boiler efficiency is reduced due to fractional air combustion. The boiler comprises a main combustor nozzle and an overfire air nozzle assembly, wherein the overfire air nozzle assembly comprises a first overfire air nozzle and a second overfire air nozzle; the structural forms of the first overfire air nozzle and the second overfire air nozzle are different; the overfire air nozzle assembly is positioned above the main combustor nozzle. The boiler provided by the technical scheme of the utility model is simultaneously provided with the first overfire air nozzle and the second overfire air nozzle which have different structural forms, so that flue gas rising from a reducing region in a hearth can be effectively caught in all directions; furthermore, full complete combustion of coal powder can be guaranteed, and the CO content of the flue gas from the outlet of the hearth is reduced; the problem that the boiler efficiency is reduced due to the fractional air combustion is solved.
Description
Technical field
The utility model relates to pulverized-coal fired boiler low nitrogen burning technical field, is specifically related to a kind of boiler.
Background technology
The boiler shape of coal-fired thermal power generation unit is varied, the combustion system adopting mainly contains corner tangential firing, the burning of wall delta hedge delta and down-ejection type W flame combustion mode etc., although having had significantly, boiler combustion efficiency promotes, but the high pollution of coal-burning boiler remains the large difficulty of pendulum in face of coal-fired firepower electrical plant, wherein thermal power plant's nitrogen oxide (NOx) discharge has surpassed sulfur dioxide becomes the main source that acid rain forms, and environmental administration has put into effect the atmosphere polluting problem that the strictest discharged nitrous oxides standard is controlled thermal power plant.
For the high problem of exhaustion of nitrogen oxides from coal-fired boiler, the current major measure of taking has: increase after-flame wind (OFA) and carry out burner hearth Researched of Air Staging Combustion Burning Pulverized Coal, burner design is transformed into low NOx generation type burner, adopts fuel re-burning mode, adopts flue gas recirculation mode, reduces the low oxygen combustion method of operation of boiler export oxygen amount etc.In above-mentioned many measures, to increase after-flame wind, to carry out the mode effect of burner hearth Researched of Air Staging Combustion Burning Pulverized Coal the most obvious again, but air classification often also can bring that unburned carbon in flue dust rises, CO raises, degradation problem under boiler efficiency.How more effectively to carry out Researched of Air Staging Combustion Burning Pulverized Coal, to reduce nitrogen oxide, generate, the impact again it being brought to boiler combustion is down to minimum, is a difficult problem of pendulum in face of vast boiler producer and the running technology personnel of power plant.
At present, the method that generating plant pulverized coal boiler burner hearth Researched of Air Staging Combustion Burning Pulverized Coal mainly adopts is, at boiler upper furnace, arrange after-flame wind, burner hearth is divided into primary zone, reducing zone and burning-out zone, containing general mood stream of coal dust, by burner, spray into burner hearth primary zone, coal dust catches fire in time and burns in burner outlet vicinity, send into the oxygen amount in primary zone lower than the required theoretical air requirement of coal dust firing, make pulverized coal particle in primary zone abundant after-flame under oxygen debt environment, the N element that coal contains and airborne nitrogen at high temperature Partial Conversion become NO, part generates the intermediate products such as HCN, there is reduction and answer in the intermediate products such as inner flue gas of the stove enters behind reducing zone, a large amount of HCN meeting and the NO having generated, NO is reduced into N
2, this can significantly reduce NOx and generate.Above reducing zone, by after-flame wind snout, spraying into after after-flame wind, in burning-out zone, the material such as unburnt carbon and CO burns away, thereby guarantees that boiler combustion efficiency does not decline.
Inventor finds: the after-flame wind snout that Researched of Air Staging Combustion Burning Pulverized Coal technology adopts mostly now is circle or the rectangular jet of single structure pattern, Fig. 1 is the boiler schematic diagram that in prior art, a kind of after-flame wind snout is arranged, it adopts is circular after-flame wind snout 112, and circular after-flame wind snout 112 is arranged on the top of main burner spout 111.The two-layer airflow channel structure of the normal employing of circular after-flame wind snout 112 structures, inner side is direct current wind passage, outside, for installing the eddy flow wind passage of swirl vane additional, by adopting single OFA spout structure to set up after-flame wind, is divided into primary zone 101, reducing zone 102 and burning-out zone 103 by burner hearth.
Inventor finds that prior art at least exists following problems: existing single after-flame wind structure, when in adopting, direct current wind adds the circular jetting mouth structure of outer eddy flow wind, though the after-flame wind that can guarantee to spray in burner hearth has good coverage rate, but often can not guarantee that it has enough rigidity to penetrate the flue gas rising in burner hearth, very easily in burner hearth center, form flue gas corridor; When adopting square can fix and during the rectangular jet of swingable adjusting, rigidity of its ejection air-flow is obviously greater than circular spout, but the air-flow of its ejaculation can not effectively entrainment and cover the flue gas rising, and very easily between adjacent after-flame wind snout, forms flue gas corridor.Therefore during the single layout of spout of two kinds of structural shapes, in all can not effective omnibearing seizure burner hearth by rising the flue gas of coming on reducing zone, can not guarantee the abundant after-flame of coal dust and reduce the CO content in furnace outlet flue gas, eliminating the boiler efficiency decline problem because adopting Researched of Air Staging Combustion Burning Pulverized Coal to cause.
Therefore, can reach optimum air classification amount while how to guarantee boiler combustion, can effectively solve again the boiler efficiency decline problem of bringing because of Researched of Air Staging Combustion Burning Pulverized Coal, be this area engineers and technicians' urgent problem.
Utility model content
One of them object of the present utility model is to propose a kind of boiler, for reaching under the prerequisite of optimum air classification amount when guaranteeing boiler combustion, improves the efficiency of combustion of boiler in Researched of Air Staging Combustion Burning Pulverized Coal situation.
For achieving the above object, the utility model provides following technical scheme:
The utility model provides a kind of boiler, comprises main burner spout and after-flame wind snout assembly;
Described after-flame wind snout assembly comprises the first after-flame wind snout and the second after-flame wind snout, and described the first after-flame wind snout is different with the structural shape of described the second after-flame wind snout;
Described after-flame wind snout assembly is positioned at the top of described main burner spout.
In preferred or optional embodiment, described after-flame wind snout assembly in the vertical direction has one deck or at least two-layer.
In preferred or optional embodiment, every layer of described after-flame wind snout assembly all comprises described at least one the first after-flame wind snout and the second after-flame wind snout described at least one.
In preferred or optional embodiment, described in every layer of described after-flame wind snout assembly, the total quantity of the first after-flame wind snout and described the second after-flame wind snout is consistent with the quantity of described main burner spout, and described after-flame wind snout assembly and the corresponding layout of described main burner spout.
In preferred or optional embodiment, described in every layer of described after-flame wind snout assembly, the first after-flame wind snout and the total quantity of described the second after-flame wind snout and the quantity of described main burner spout differ one, and described after-flame wind snout assembly and described main burner spout are staggered in arrangement.
In preferred or optional embodiment, many two than the quantity of described main burner spout of the total quantitys of the first after-flame wind snout and described the second after-flame wind snout described in every layer of described after-flame wind snout assembly, and wherein two spouts of described after-flame wind snout assembly are arranged near the body of wall of described boiler, remaining spout and the corresponding layout of described main burner spout.
In preferred or optional embodiment, every layer of described the first after-flame wind snout and alternate layout of described the second after-flame wind snout that described after-flame wind snout assembly is included.
In preferred or optional embodiment, described after-flame wind snout assembly in the vertical direction has at least two-layer, and wherein at least one deck only includes described the first after-flame wind snout, and at least another layer only includes described the second after-flame wind snout.
In preferred or optional embodiment,
The quantity of described the first after-flame wind snout that wherein at least one deck only includes equates with the quantity of described main burner spout, and described the first after-flame wind snout and the corresponding layout of described main burner spout; And/or,
The quantity of described the second after-flame wind snout that at least another layer only includes equates with the quantity of described main burner spout, and described the second after-flame wind snout and the corresponding layout of described main burner spout.
In preferred or optional embodiment,
The quantity of described the first after-flame wind snout and the quantity of described main burner spout that wherein at least one deck only includes differ one, and described the first after-flame wind snout and described main burner spout are staggered in arrangement; And/or,
The quantity of described the second after-flame wind snout that at least another layer only includes and the quantity of described main burner spout differ one, and described the second after-flame wind snout and described main burner spout are staggered in arrangement.
In preferred or optional embodiment, described the first after-flame wind snout is rectangle after-flame wind snout, and described the second after-flame wind snout is circular after-flame wind snout.
In preferred or optional embodiment,
Described circular after-flame wind snout is to have the structural shape that inner ring direct current wind adds outer ring eddy flow wind effect; And/or,
Described rectangle after-flame wind snout is the structural shape with rectangle direct current wind effect, and the regulative mode of described rectangle after-flame wind snout is manual adjustments or motorized adjustment.
In preferred or optional embodiment, described after-flame wind snout arrangement of components is after boiler front wall, boiler on wall or boiler side wall.
Based on technique scheme, the utility model embodiment at least can produce following technique effect:
The boiler that technique scheme provides, there is the first different after-flame wind snout of structural shape and the second after-flame wind snout simultaneously, different structural shapes makes to have different characteristics from the first after-flame wind snout and the second after-flame wind snout after-flame wind out: the circular after-flame wind snout of take adds the structural shape of outer ring eddy flow wind effect as having inner ring direct current wind, rectangle after-flame wind snout is that the structural shape with rectangle direct current wind effect is example, while adopting inner ring direct current wind to add the circular jetting mouth structure of outer ring eddy flow wind, the after-flame wind that can guarantee to spray in burner hearth has good coverage rate.The rigidity of rectangle after-flame wind snout ejection air-flow is obviously greater than circular spout.Visible, the after-flame wind snout of two kinds of structural shapes is used simultaneously, can be so that guarantee that the after-flame wind spraying in burner hearth has good coverage rate, and can guarantee that it has enough rigidity to penetrate the flue gas rising in burner hearth, be difficult in burner hearth center, forming flue gas corridor, and be difficult for forming flue gas corridor between adjacent after-flame wind snout.Can catch effectively in all directions thus the flue gas of being come by liter on reducing zone in burner hearth, and can guarantee the abundant after-flame of coal dust and reduce the CO content in furnace outlet flue gas, reduce the boiler efficiency decline problem of even eliminating because adopting Researched of Air Staging Combustion Burning Pulverized Coal to cause.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the boiler schematic diagram that in prior art, a kind of after-flame wind snout is arranged;
The schematic diagram of a kind of arrangement form of after-flame wind snout assembly on the boiler that Fig. 2 provides for the utility model embodiment;
Fig. 3 is the schematic top plan view of Fig. 2;
The schematic diagram of the another kind of arrangement form of after-flame wind snout assembly on the boiler that Fig. 4 provides for the utility model embodiment;
The schematic diagram of another arrangement form of after-flame wind snout assembly on the boiler that Fig. 5 provides for the utility model embodiment;
The schematic diagram of another arrangement form of after-flame wind snout assembly on the boiler that Fig. 6 provides for the utility model embodiment;
The schematic diagram of the another kind of arrangement form of after-flame wind snout assembly on the boiler that Fig. 7 provides for the utility model embodiment;
The schematic diagram of another arrangement form of after-flame wind snout assembly on the boiler that Fig. 8 provides for the utility model embodiment.
The specific embodiment
Can understand the distinctive points between content of the present utility model and the utility model and prior art with reference to accompanying drawing Fig. 1～Fig. 8 and word content below.Below, by accompanying drawing and the mode of enumerating optional embodiment more of the present utility model, the technical solution of the utility model (comprising optimal technical scheme) is described in further detail.It should be noted that: any technical characterictic in the present embodiment, any technical scheme is all the technical characterictic of plurality of optional or one or more in optional technical scheme, cannot exhaustive all alternative technical characterictics of the present utility model and alternative technical scheme in order to describe succinct need in presents, also the embodiment that is not easy to each technical characterictic all emphasizes that it is one of optional numerous embodiments, so those skilled in the art should know: any technical characterictic in the present embodiment and any technical scheme all do not limit protection domain of the present utility model, protection domain of the present utility model should comprise that those skilled in the art do not pay the thinkable any alternate embodiments of creative work.
Technical scheme the utility model being provided below in conjunction with Fig. 2～Fig. 8 is carried out more detailed elaboration, and arbitrary technological means that the utility model is provided is replaced or any two or more technological means that the utility model is provided or technical characterictic combine mutually and the technical scheme that obtains all should be within protection domain of the present utility model.
The utility model embodiment provides a kind of boiler, comprises main burner spout 211 and after-flame wind snout assembly.After-flame wind snout assembly comprises the first after-flame wind snout and the second after-flame wind snout, and the first after-flame wind snout is different with the structural shape of the second after-flame wind snout.After-flame wind snout assembly is positioned at the top of main burner spout 211.
Particularly, the first after-flame wind snout can, for circular after-flame wind snout 213, hereinafter also be described with this for rectangle after-flame wind snout 212, the second after-flame wind snouts.
The boiler that technique scheme provides, there is the first different after-flame wind snout of structural shape and the second after-flame wind snout simultaneously, different structural shapes makes to have different characteristics from the first after-flame wind snout and the second after-flame wind snout after-flame wind out: the circular after-flame wind snout 213 of take adds the structural shape of outer ring eddy flow wind effect as having inner ring direct current wind, rectangle after-flame wind snout 212 is example for having the structural shape of rectangle direct current wind effect, while adopting inner ring direct current wind to add the circular jetting mouth structure of outer ring eddy flow wind, the after-flame wind that can guarantee to spray in burner hearth has good coverage rate.The rigidity of rectangle after-flame wind snout 212 ejection air-flows is obviously greater than circular spout.Visible, the after-flame wind snout of two kinds of structural shapes is used simultaneously, can be so that guarantee that the after-flame wind spraying in burner hearth has good coverage rate, and can guarantee that it has enough rigidity to penetrate the flue gas rising in burner hearth, be difficult in burner hearth center, forming flue gas corridor, and be difficult for forming flue gas corridor between adjacent after-flame wind snout.Can catch effectively in all directions thus the flue gas that rises and come by reducing zone 202 in burner hearth, and can guarantee the abundant after-flame of coal dust and reduce the CO content in furnace outlet flue gas, eliminate the boiler efficiency decline problem because adopting Researched of Air Staging Combustion Burning Pulverized Coal to cause.
Herein, the regulative mode of rectangle after-flame wind snout 212 can be manual adjustments or motorized adjustment.
Herein, after-flame wind snout assembly in the vertical direction can arrange one or more layers.When only having one deck after-flame wind snout assembly, this grate firing to the greatest extent wind snout assembly should have rectangle after-flame wind snout 212 and circular after-flame wind snout 213 simultaneously, and rectangle after-flame wind snout 212 and circular after-flame wind snout 213 can alternate setting or settings at random.When arranging at random, the quantity of rectangle after-flame wind snout 212 can be one, and remaining is all circular after-flame wind snout 213; Or the quantity of circular after-flame wind snout 213 is set to one, remaining is all rectangle after-flame wind snout 212.
The every grate firing to the greatest extent total quantity of the included rectangle after-flame wind snout 212 of wind snout assembly and circular after-flame wind snout 213 is preferably similar with the quantity of main burner spout 211, is specifically as follows: quantity equates, quantity differs one or quantity and differs two.When quantity equates, the spout of main burner spout 211 corresponding after-flame wind snout assemblies, i.e. rectangle after-flame wind snout 212 or circular after-flame wind snout 213.When quantity differs one, if the included spout quantity of after-flame wind snout assembly than the quantity of main burner spout 211 many one, main burner spout 211 correspondences are arranged in the middle of the spout of two adjacent after-flame wind snout assemblies so.If many one of the quantity of main burner spout 211, the centre of two main burner spouts 211 that each spout of after-flame wind snout assembly is corresponding adjacent.
If many two than the quantity of main burner spout 211 of the included spout total quantitys of after-flame wind snout assembly, the spout of after-flame wind snout assembly and main burner spout 211 corresponding setting one by one so, the spout of remaining two after-flame wind snout assemblies is arranged between the spout and body of wall of that after-flame wind snout assembly of the most close boiler body of wall.
When after-flame wind snout assembly in the vertical direction has multilayer, wherein one deck is all rectangle after-flame wind snout 212, and another layer is all circular after-flame wind snout 213.Every layer of included spout quantity and arrangement can be referring to the situations that above after-flame wind snout assembly is one deck.
To introduce in detail above-mentioned various situation below.
Paper only has the situation of one deck after-flame wind snout assembly.
Every grate firing to the greatest extent wind snout assembly all comprises at least one rectangle after-flame wind snout 212 and at least one circular after-flame wind snout 213.
Referring to Fig. 2 and Fig. 3, every grate firing to the greatest extent in wind snout assembly rectangle after-flame wind snout 212 and the total quantity of circular after-flame wind snout 213 and the quantity of main burner spout 211 differ one, and after-flame wind snout assembly and main burner spout 211 are staggered in arrangement.
Further, most included rectangle after-flame wind snout 212 and the alternate layout of circular after-flame wind snout 213 of wind snout assembly of every grate firing.Fig. 2 and Fig. 3 signal be that the total quantity of rectangle after-flame wind snout 212 and circular after-flame wind snout 213 is than the situation of many one of the quantity of main burner spout 211, certainly, the total quantity of rectangle after-flame wind snout 212 and circular after-flame wind snout 213 also can be than the quantity of main burner spout 211 few one.
Fig. 4 has illustrated another kind of situation, referring to Fig. 4, in the most wind snout assembly of every grate firing, the total quantity of rectangle after-flame wind snout 212 and circular after-flame wind snout 213 is consistent with the quantity of main burner spout 211, and after-flame wind snout assembly layout corresponding to main burner spout 211.
Fig. 5 has illustrated another situation, referring to Fig. 5, every grate firing is the total quantity of rectangle after-flame wind snout 212 and circular after-flame wind snout 213 than the quantity of main burner spout 211 many two in wind snout assembly to the greatest extent, and wherein two spouts of after-flame wind snout assembly are arranged near the body of wall of boiler, remaining spout layout corresponding to main burner spout 211.
Introduce the situation with multilayer after-flame wind snout assembly below, this sentences two-layer is example.
Referring to Fig. 6, after-flame wind snout assembly in the vertical direction has at least two-layer, and wherein at least one deck only includes rectangle after-flame wind snout 212, and at least another layer only includes circular after-flame wind snout 213.
When having multilayer after-flame wind snout assembly, the included spout quantity of wind snout assembly can be referring to the situation of one deck to the greatest extent for every grate firing, and the included spout quantity of wind snout assembly can be identical to the greatest extent for every grate firing, also can be different.
Referring to Fig. 6, take that two-layer after-flame wind snout assembly is set is example, the quantity of the rectangle after-flame wind snout 212 that wherein at least one deck only includes equates with the quantity of main burner spout 211, and rectangle after-flame wind snout 212 layout corresponding to main burner spout 211.And/or the quantity of the circular after-flame wind snout 213 that at least another layer only includes equates with the quantity of main burner spout 211, and circular after-flame wind snout 213 layout corresponding to main burner spout 211.
Referring to Fig. 7 and Fig. 8, certainly, the every grate firing to the greatest extent included spout quantity of wind snout assembly also can adopt following manner: the quantity of rectangle after-flame wind snout 212 and the quantity of main burner spout 211 that wherein at least one deck only includes differ one, and rectangle after-flame wind snout 21 is staggered in arrangement with main burner spout 211.And/or the quantity of circular after-flame wind snout 213 and the quantity of main burner spout 211 that at least another layer only includes differ one, and circular after-flame wind snout 213 is staggered in arrangement with main burner spout 211.
According to actual needs, after-flame wind snout assembly can be arranged in after boiler front wall 221, boiler on wall 222 or boiler side wall 223.
The boiler that technique scheme provides, combines by rectangle after-flame wind snout 212 and circular after-flame wind snout 213 top that is arranged in main burner spout 211, and burner hearth is divided into primary zone 201, reducing zone 202, burning-out zone 203.Coal dust and the required a part of air quantity of burning are sent into burner hearth primary zone 201 by main burner spout 211, in primary zone, 201 interiorly catch fire in time and burn, with coal dust, enter air quantity in primary zone 201 needed air quantity will be lower than coal dust completing combustion time, pulverized coal particle is in the abundant after-flame of oxygen debt condition, the materials such as the N Element generation NO in the N element himself containing while making to enter the coal dust firing in primary zone 201 and burning required air and HCN (representative of reproducibility intermediate product).The materials such as rear flue gas and uncompleted burned carbon that catch fire and burn in primary zone 201 enter reducing zone 202, in this space, do not have wind to fill into, make from the combustion product in flue gas after the burning in primary zone 201 in strong reducing property atmosphere, there is reduction reaction in a large amount of intermediate product HCN in combustion product etc. and NO, is reduced into N
2.
After-flame wind sprays into a distance above primary zone 201, and to form rational reducing zone 202, after-flame wind top forms burning-out zone 203, and the materials such as the flue gas after burning and uncompleted burned carbon burn away after filling into after-flame wind.By being arranged in the after-flame wind that the rectangle after-flame wind snout 212 of wall 222 sprays into after boiler front wall 221 and boiler, form rectangular jet after-flame wind penetrating region 231, after boiler front wall 221, boiler, wall 222 air-flow of arranging that liquidates can effectively penetrate the flue gas being risen by reducing zone 202, eliminates the flue gas corridor, burner hearth center 241 of boiler for deeply direction middle; By being arranged in the after-flame wind that the circular after-flame wind snout 213 of wall 222 sprays into after boiler front wall 221 and boiler, between adjacent two rectangle after-flame wind snouts 212, form the circular spout after-flame wind area of coverage 232, elimination is pushed rising flue gas because rectangle after-flame wind penetrates into burner hearth center, the flue gas corridor, nearly furnace wall place 242 between two rectangle after-flame wind snouts 212 forming, to guarantee the abundant after-flame of uncombusted material.
The boiler that technique scheme provides, high for existing generating plant pulverized coal boiler discharged nitrous oxides, while carrying out Researched of Air Staging Combustion Burning Pulverized Coal, can not guarantee boiler combustion efficiency, the after-flame wind of setting up can not be taken into account the penetration depth of the flue gas that rises in burner hearth and effectively cover, cause in afterbody smoke evacuation in the high and flying dust of CO content the problems such as uncompleted burned carbon content is more, a kind of boiler with the after-flame wind snout of various structures pattern of special proposition, boiler combustion exhausted wind arrangement is optimized, realize generating plant pulverized coal boiler and set up the Researched of Air Staging Combustion Burning Pulverized Coal after after-flame wind, do not reducing under the prerequisite of boiler efficiency, significantly reducing nitrogen oxide generates, when the flue gas that rises mixes, take into account the control at furnace flame center in guaranteeing after-flame wind and stove, guarantee that boiler main, reheat steam temperature reach rated value, control boiler spray water flux, the lifting of the covering of after-flame wind and penetration capacity, also can effectively solve the inner flue gas of the stove corridor of causing because of single after-flame wind snout layout, the Local C O excessive concentration of avoiding boiler upper furnace and heated surface at the end of boiler, alleviates heated surface corrosion, improves boiler operatiopn security.
Above-mentioned arbitrary technical scheme disclosed in the utility model unless otherwise stated, if it discloses number range, so disclosed number range is preferred number range, any it should be appreciated by those skilled in the art: preferred number range is only the obvious or representative numerical value of technique effect in many enforceable numerical value.Because numerical value is more, cannot be exhaustive, so the utility model just discloses part numerical value to illustrate the technical solution of the utility model, and the above-mentioned numerical value of enumerating should not form the restriction of the utility model being created to protection domain.
If used the words such as " first ", " second " to limit parts herein, those skilled in the art should know: the use of " first ", " second " is only used to be convenient to describe above parts are distinguished as not having outside Stated otherwise, and above-mentioned word does not have special implication.
Simultaneously, if above-mentioned the utility model discloses or has related to parts or the structural member of connection fastened to each other, so, unless otherwise stated, be fixedly connected with and can be understood as: can dismantle and be fixedly connected with (for example using bolt or screw to connect), also can be understood as: non-removable being fixedly connected with (for example rivet, weld), certainly, connection fastened to each other also can for example, be replaced (obviously cannot adopt except integrally formed technique) by integral type structure (use casting technique is integrally formed to be created).
In addition, in the disclosed arbitrary technical scheme of above-mentioned the utility model applied for the term that represents position relationship or shape unless otherwise stated its implication comprise and its approximate, similar or approaching state or shape.Arbitrary parts that the utility model provides can be both to be assembled by a plurality of independent parts, the produced separate part of the technique that also can be one of the forming.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the field are to be understood that: still can modify or part technical characterictic is equal to replacement the specific embodiment of the present utility model; And not departing from the spirit of technical solutions of the utility model, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (13)
1. a boiler, is characterized in that, comprises main burner spout and after-flame wind snout assembly;
Described after-flame wind snout assembly comprises the first after-flame wind snout and the second after-flame wind snout, and described the first after-flame wind snout is different with the structural shape of described the second after-flame wind snout;
Described after-flame wind snout assembly is positioned at the top of described main burner spout.
2. boiler according to claim 1, is characterized in that, described after-flame wind snout assembly in the vertical direction has one deck or at least two-layer.
3. boiler according to claim 2, is characterized in that, every layer of described after-flame wind snout assembly all comprises described at least one the first after-flame wind snout and the second after-flame wind snout described at least one.
4. boiler according to claim 3, it is characterized in that, described in every layer of described after-flame wind snout assembly, the total quantity of the first after-flame wind snout and described the second after-flame wind snout is consistent with the quantity of described main burner spout, and described after-flame wind snout assembly and the corresponding layout of described main burner spout.
5. boiler according to claim 3, it is characterized in that, described in every layer of described after-flame wind snout assembly, the first after-flame wind snout and the total quantity of described the second after-flame wind snout and the quantity of described main burner spout differ one, and described after-flame wind snout assembly and described main burner spout are staggered in arrangement.
6. boiler according to claim 3, it is characterized in that, many two than the quantity of described main burner spout of the total quantitys of the first after-flame wind snout and described the second after-flame wind snout described in every layer of described after-flame wind snout assembly, and wherein two spouts of described after-flame wind snout assembly are arranged near the body of wall of described boiler, remaining spout and the corresponding layout of described main burner spout.
7. boiler according to claim 3, is characterized in that, every layer of described the first after-flame wind snout and alternate layout of described the second after-flame wind snout that described after-flame wind snout assembly is included.
8. boiler according to claim 2, is characterized in that, described after-flame wind snout assembly in the vertical direction has at least two-layer, and wherein at least one deck only includes described the first after-flame wind snout, and at least another layer only includes described the second after-flame wind snout.
9. boiler according to claim 8, is characterized in that,
The quantity of described the first after-flame wind snout that wherein at least one deck only includes equates with the quantity of described main burner spout, and described the first after-flame wind snout and the corresponding layout of described main burner spout; And/or,
The quantity of described the second after-flame wind snout that at least another layer only includes equates with the quantity of described main burner spout, and described the second after-flame wind snout and the corresponding layout of described main burner spout.
10. boiler according to claim 8, is characterized in that,
The quantity of described the first after-flame wind snout and the quantity of described main burner spout that wherein at least one deck only includes differ one, and described the first after-flame wind snout and described main burner spout are staggered in arrangement; And/or,
The quantity of described the second after-flame wind snout that at least another layer only includes and the quantity of described main burner spout differ one, and described the second after-flame wind snout and described main burner spout are staggered in arrangement.
11. boilers according to claim 1, is characterized in that, described the first after-flame wind snout is rectangle after-flame wind snout, and described the second after-flame wind snout is circular after-flame wind snout.
12. boilers according to claim 11, is characterized in that,
Described circular after-flame wind snout is to have the structural shape that inner ring direct current wind adds outer ring eddy flow wind effect; And/or,
Described rectangle after-flame wind snout is the structural shape with rectangle direct current wind effect, and the regulative mode of described rectangle after-flame wind snout is manual adjustments or motorized adjustment.
13. boilers according to claim 1, is characterized in that, described after-flame wind snout arrangement of components is after boiler front wall, boiler on wall or boiler side wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312513.1U CN203907595U (en) | 2014-06-13 | 2014-06-13 | Boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420312513.1U CN203907595U (en) | 2014-06-13 | 2014-06-13 | Boiler |
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| Publication Number | Publication Date |
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| CN203907595U true CN203907595U (en) | 2014-10-29 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106016257A (en) * | 2016-05-20 | 2016-10-12 | 东方电气集团东方锅炉股份有限公司 | Over-fire air arrangement method of opposite firing boiler |
| CN106678782A (en) * | 2015-11-06 | 2017-05-17 | 浙江浙能技术研究院有限公司 | Bowl-shaped or W-shaped wind distributing method for rotational flow combustion of large power station coal-fired boiler |
| CN107940446A (en) * | 2017-12-08 | 2018-04-20 | 东方电气集团东方锅炉股份有限公司 | A kind of big volume inhales jet stream after-flame wind system and injection method |
| CN113958948A (en) * | 2021-11-25 | 2022-01-21 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
-
2014
- 2014-06-13 CN CN201420312513.1U patent/CN203907595U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106678782A (en) * | 2015-11-06 | 2017-05-17 | 浙江浙能技术研究院有限公司 | Bowl-shaped or W-shaped wind distributing method for rotational flow combustion of large power station coal-fired boiler |
| CN106016257A (en) * | 2016-05-20 | 2016-10-12 | 东方电气集团东方锅炉股份有限公司 | Over-fire air arrangement method of opposite firing boiler |
| CN106016257B (en) * | 2016-05-20 | 2017-12-12 | 东方电气集团东方锅炉股份有限公司 | A kind of burnout degree method for arranging of Opposite Firing Boiler |
| CN107940446A (en) * | 2017-12-08 | 2018-04-20 | 东方电气集团东方锅炉股份有限公司 | A kind of big volume inhales jet stream after-flame wind system and injection method |
| CN107940446B (en) * | 2017-12-08 | 2024-01-16 | 东方电气集团东方锅炉股份有限公司 | Large entrainment jet flow over-fire air system and jet method |
| CN113958948A (en) * | 2021-11-25 | 2022-01-21 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
| CN113958948B (en) * | 2021-11-25 | 2022-08-26 | 哈尔滨工业大学 | W flame boiler suitable for wide coal combustion and combustion method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141029 |