CN202350013U - W-shaped flame boiler - Google Patents
W-shaped flame boiler Download PDFInfo
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- CN202350013U CN202350013U CN2011205140240U CN201120514024U CN202350013U CN 202350013 U CN202350013 U CN 202350013U CN 2011205140240 U CN2011205140240 U CN 2011205140240U CN 201120514024 U CN201120514024 U CN 201120514024U CN 202350013 U CN202350013 U CN 202350013U
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- Prior art keywords
- boiler
- weary gas
- gas blowout
- flame
- wall
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 210000004894 snout Anatomy 0.000 claims description 28
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 15
- 239000000446 fuel Substances 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 5
- 230000008901 benefit Effects 0.000 abstract description 5
- 229910052799 carbon Inorganic materials 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 239000010881 fly ash Substances 0.000 abstract 2
- 239000007789 gas Substances 0.000 description 43
- 238000002485 combustion reaction Methods 0.000 description 21
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 9
- 239000003245 coal Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000007921 spray Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003500 flue dust Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241000143973 Libytheinae Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Abstract
The utility model relates to a W-shaped flame boiler, which comprises an upper hearth and a lower hearth, wherein an exhaust gas nozzle is arranged at an arch throat between the upper hearth and the lower hearth; the exhaust gas nozzle is inclined downwards and arranged on a vertical water cooling wall above the arch throat; and an over-fire air nozzle is arranged on the upper part of the exhaust gas nozzle. The W-shaped flame boiler has the advantages that by taking exhaust gas as re-burning fuel, the problem that the exhaust gas is burnt out can be effectively solved, and the carbon content of fly ash is reduced; by arranging the exhaust gas nozzle on the lower part of the upper hearth, slagging of a throat part can be prevented; and by arranging the over-fire air nozzle on the upper part of the exhaust gas nozzle, an over-arch secondary air arrangement mode is optimized, and low-nitrogen-oxides (NOx) burning of the boiler is facilitated. Moreover, a complicated process is eliminated, the W-shaped flame boiler is low in cost and has certain economic and environmental benefits, the burning efficiency of the boiler can be effectively improved, the carbon content of the fly ash is reduced, and the content of NOx is reduced.
Description
Technical field
The utility model relates to a kind of boiler plant, particularly relates to a kind of W type flame boiler.
Background technology
W type flame boiler is the type of furnace that uses unburnable coal (like anthracite, meager coal).Owing to arranged a large amount of wall with refractory lining, refracto in the lower hearth of the type boiler, form adiabatic furnace, make burner hearth keep higher temperature, playing the effect of catch fire reinforcement and smooth combustion.But also cause the type boiler discharged nitrous oxides very high simultaneously, discharge water is on average at 1000mg/Nm
3More than, even surpass 1800mg/Nm
3
Become strict along with environmental protection requirement heals, the W type flame boiler unit of existing operation is imitateed and is used the bituminous coal unit, increases dress after-flame wind snout at arch windward upper box part, in order to reduce nitrogen oxide emission.But in practical application; Only rely on the way that increases after-flame wind and do not adopt other supplementary means to reach the reduction nitrogen oxide to bring a lot of adverse influences to using anthracitic W type flame boiler operation; Like unstable combustion; Very easily put out a fire during underload, unburned carbon in flue dust increases severely, and efficiency of combustion descends or the like.
The main cause that produces the problems referred to above is: low volatile anthracite, meager coal catch fire and smooth combustion needs burner hearth to have higher temperature; But keep the increase that higher temperature can cause formation of nitrogen oxides, this is contradiction that is difficult to be in harmonious proportion in the prior art.
To the high problem of W flame boiler discharged nitrous oxides, the existing numerous patents delivered and the multinomial improvement project that has put into operation.For example: Lee of Harbin Institute of Technology disclose " a kind of W type flame furnace of low-NOx coal powder " (Chinese utility model patent ZL200620020919.8) etc. multinomial such as has striven and has reduced the method and apparatus of nitrogen oxide about W type flame boiler, and the Zhou Huaichun of the Central China University of Science and Technology etc. discloses " a kind of W type flame boiler combustion exhausted wind apparatus " (Chinese utility model patent ZL200420076058.6) or the like.But some patented technology finds that in the practical applications of power plant boiler performance receives very big influence after the transformation of employing low NOx combusting technology, such as: the instability of catching fire; The lower hearth burn deterioration; The ash content phosphorus content is high, and the convection heating surface overtemperature is serious, degradation under the boiler combustion thermal efficiency.
To the high problem of W flame boiler discharged nitrous oxides, the existing technical scheme majority is to start with from the single increase after-flame of boiler wind, when reducing nitrogen oxide, has also reduced efficiency of combustion, and the unit business efficiency is descended.In application, expose following subject matter: the one, influence the boiler combustion performance, the combustion stability that is mainly reflected in boiler is poor, and the combustion chamber draft fluctuation is big, is prone to fire extinguishing; The 2nd, influence the steam temperature performance, be mainly reflected in the variation of stove internal combustion and cause steam temperature to alter a great deal, can not guarantee the safety of steam turbine side with vapour.
The utility model content
The purpose of the utility model is to propose a kind of W type flame boiler that can utilize the stove internal combustion to reduce discharged nitrous oxides.
For realizing above-mentioned purpose; The utility model provides a kind of W type flame boiler; The upper furnace and the lower hearth that comprise boiler; Aditus laryngis place, arch between said upper furnace and the lower hearth is provided with weary gas blowout mouth, and said weary gas blowout mouth is downward-sloping to be arranged on the above vertical water wall of said arch aditus laryngis, and on the vertical water wall on said weary gas blowout mouth top, also is provided with the after-flame wind snout.
Preferably, the inclination angle that is of said weary gas blowout mouth and vertical direction is 30～60 degree.
Preferably, said weary gas blowout mouth is arranged on the position near the arch aditus laryngis.Preferably, said boiler comprises front wall and the back wall with full wall superheater, is equipped with at least one group of after-flame wind snout and weary gas blowout mouth on said front wall and the back wall.
Preferably, said boiler comprises that at least two group horizontal symmetrical are arranged at after-flame wind snout and the weary gas blowout mouth on boiler front wall and the back wall.
Preferably, when the full wall superheater of the front wall lower end of boiler was nearer apart from the arch of boiler, the said absolute altitude that is positioned at the after-flame wind snout of front wall all was higher than the after-flame wind snout that is positioned at the back wall.
Preferably, the spout of said weary gas blowout mouth is square, or rectangle, or circular, or oval, or the combination between them.
Based on technique scheme, the utility model has the advantages that:
The utility model can effectively solve the problem that lacks the gas after-flame with weary gas as reburning fuel, reduces unburned carbon in flue dust; To lack the gas blowout mouth and be arranged on the upper furnace bottom, help preventing the slagging scorification of aditus laryngis position; The after-flame wind snout is arranged on the top that lacks the gas blowout mouth, optimizes arch and go up the secondary wind arrangement, help the boiler low NOx combustion.In addition, the utility model need not complicated technology, and cost is low, can improve boiler combustion efficiency effectively, reduces unburned carbon in flue dust, has taken into account the reduction nitrogen oxide simultaneously, has certain economic benefits and environmental benefit.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the structural representation of prior art W type flame boiler;
Fig. 2 is the structural representation of the utility model;
Fig. 3 is the local enlarged diagram of Fig. 2 mid portion.
The specific embodiment
Through accompanying drawing and embodiment, the technical scheme of the utility model is done further detailed description below.
Referring to Fig. 2 and Fig. 3; The preferred embodiment of a kind of W type of the utility model shown in it flame boiler comprises upper furnace 1 and lower hearth 12, and the arch aditus laryngis between said upper furnace 1 and the lower hearth 12 is provided with weary gas blowout mouth 3; Said weary gas blowout mouth 3 downward-sloping being arranged on the above vertical water wall 50 of said arch aditus laryngis; Particularly, weary gas blowout mouth 3 is taken root on vertical water wall 50, as shown in Figures 2 and 3 with certain tilt angled down at the opening part of vertical water wall 50; And the top at said weary gas blowout mouth 3 also is provided with after-flame wind snout 2, and is as shown in Figure 3.Preferably, said weary gas blowout mouth 3 is 30～60 degree with the inclination angle that vertical direction is, and in the present embodiment, said weary gas blowout mouth 3 is 40 degree with the inclination angle that vertical direction is.
Further; As shown in Figure 3; Said after-flame wind snout 2 also is arranged on the above vertical water wall of said arch aditus laryngis, thus, and in the utility model; The inside of said boiler also comprises the burning-out zone 20 and the reburning zone 30 that are formed by said after-flame wind snout 2, weary gas blowout mouth 3 except the primary zone 40 of lower hearth 12.Preferably, said weary gas blowout mouth 3 is arranged on the position of upper furnace bottom near the arch aditus laryngis, and as shown in Figure 3, this kind structure helps preventing the slagging scorification of aditus laryngis position.
Understand easily to those skilled in the art; Boiler includes front wall and the back wall with full wall superheater (not shown) usually; Be equipped with at least one group of after-flame wind snout 2 and weary gas blowout mouth 3 on said front wall of the utility model and the back wall, as shown in Figures 2 and 3.Preferably, said boiler comprises that at least two group horizontal symmetrical are arranged at the after-flame wind snout 2 and weary gas blowout mouth 3 on boiler front wall and the back wall.
The another kind of embodiment of the utility model is that when the full wall superheater of the front wall lower end of boiler was nearer apart from the arch of boiler, the said absolute altitude that is positioned at the after-flame wind snout 2 of front wall all was higher than the after-flame wind snout that is positioned at the back wall.
The course of work of the utility model said structure is:
Can transform to existing W type boiler; For example; With on the arch of boiler shown in Figure 1 near aditus laryngis former weary gas blowout mouth 300 shutoff on the lower side, the weary gas blowout mouth 3 (as shown in Figures 2 and 3) of the utility model is set on upper furnace 100 bottom aditus laryngis vertical water wall on the upper side; To lack gas thus and spray in the burner hearth with certain tilt angled down (30～60 degree) as reburning fuel, the coal dust that main burner sprays into fully burn or the stoichiometric ratio of air/fuel less than 1 basis on, fine breeze burns in the weary gas.
Further, the utility model is provided with after-flame wind snout 2 for guaranteeing the after-flame of the fine powder coke in the 30 weary gas of reburning zone in weary gas blowout mouth 3 position on the upper side, and the after-flame air quantity is taken from the surrounding air of weary gas with secondary wind.
The weary gas blowout mouth 3 of the utility model need realize that its spout form can be taked square, or rectangle through water-cooling wall perforate bend pipe, or circular, or oval, or the combined shaped between them.
The utility model utilizes the reburning technology mechanism, and in process of coal combustion, the burner hearth internal combustion is divided into three zones: 1, the primary zone 40, is oxidisability or reducing atmosphere slightly, and the reaction of NO takes place to generate; 2, the reburning zone 30, and the NO reaction that CH group that secondary fuel generates in this zone and primary combustion zone generate generates N
23, burning-out zone 20, send into secondary wind in this zone, make fuel completing combustion.
Further, referring to Fig. 2 and Fig. 3, the concrete structure of the utility model comprises upper furnace 1, after-flame wind snout 2; Weary gas blowout mouth 3, cyclone separator 4,5 mouthfuls of main burner sprays, weary gas surrounding air (A) secondary wind air door 6; Main burner surrounding air (B) secondary wind air door 7, oil burner surrounding air (C) secondary wind air door 8, classification wind (D) secondary wind air door 9; Classification wind (E) secondary wind air door 10, classification wind (F) secondary wind air door 11, lower hearth 12.Weary gas surrounding air air compartment is delivered in blast pipe road by draw at cyclone separator 4 tops, and weary gas blowout mouth 3 is taken root in vertical water wall 50 with 30～60 ° of tilt angled downs at the tapping of upper furnace lower vertical water-cooling wall 50.After-flame wind snout 2 can be taked two kinds of forms when realizing: (one), need polish off fin or band steel between the vertical water wall of relevant position, and after-flame wind is with the downward-sloping burner hearth that sprays into of slit form level; (2), need water-cooling wall perforate bend pipe to realize, its spout form can be taked square, or rectangle, or circular, or oval.
The described weary gas blowout mouth of the front wall of the utility model boiler and back wall symmetric arrangement 3, after-flame wind snout 2; Weary gas blowout mouth 3, after-flame wind snout 2 can be arranged in (60 parts that can hide of the big bellows of secondary wind) on the above vertical water wall 50 of arch aditus laryngis, like Fig. 2, shown in Figure 3.
In addition, weary gas blowout mouth 3 also can be arranged on the above vertical water wall 50 of 60 arch aditus laryngis that can hide of the big bellows of the above secondary wind of arch aditus laryngis, and 2 of after-flame wind snouts are arranged in the vertical water wall position (not shown) of the big bellows of secondary wind more than 60.
In subcritical parameter boiler, if the full wall superheater of front wall lower end is nearer apart from the arch, the after-flame wind snout 2 that front wall is arranged all is higher than the after-flame wind snout 2 that the back wall paper is put, about front-back wall difference in height Δ=100mm～2000mm; Be arranged in the boiler at furnace outlet place at supercritical unit or full wall superheater; The layout of weary gas blowout mouth 3, after-flame wind snout 2 can the front-back wall horizontal symmetrical arrangement; The low arrangement in high back before perhaps adopting, perhaps low arrangement before the height of employing back.
The operation principle of the utility model is:
In the reburning zone 30; Because containing air influence, weary gas make this zone oxygen amount sufficient relatively; The combustion that contains fine powder in the weary simultaneously gas, making the volatile matter N burning that contains in the coal dust generate NO increases, but the effect of combustion again of fine powder makes the NO growing amount in the flue gas reduce in the weary gas.The fine powder that contains in the weary gas is many more, and the reduction effect that produces during the coal powder recombustion is strong more, and it is big more to cause the NO growing amount to reduce amplitude.
At burning-out zone 20,, and then make the NO growing amount slightly rise once more but tend to be steady gradually because replenishing of after-flame wind makes the HCN and the char N oxidation of generation; In addition, the additional complete as far as possible after-flame of unburnt coke particle and a large amount of CO that makes of after-flame wind reduces solid and gas combustible loss, improves boiler combustion efficiency.
Obviously, those of ordinary skill in the art can use a kind of W type flame boiler of the utility model, constitutes various types of boiler plants.
Should be noted that at last: above embodiment only in order to the explanation the utility model technical scheme but not to its restriction; Although with reference to preferred embodiment the utility model has been carried out detailed explanation, the those of ordinary skill in affiliated field is to be understood that: still can make amendment to the specific embodiment of the utility model perhaps is equal to replacement to the part technical characterictic; And not breaking away from the spirit of the utility model technical scheme, it all should be encompassed in the middle of the technical scheme scope that the utility model asks for protection.
Claims (7)
1. W type flame boiler; Comprise upper furnace (1) and lower hearth (12); Arch aditus laryngis between said upper furnace (1) and the lower hearth (12) is provided with weary gas blowout mouth (3); It is characterized in that: said weary gas blowout mouth (3) is downward-sloping to be arranged on the above vertical water wall of said arch aditus laryngis, and on the vertical water wall on said weary gas blowout mouth (3) top, also is provided with after-flame wind snout (2).
2. W type flame boiler according to claim 1 is characterized in that: said weary gas blowout mouth (3) is 30～60 degree with the inclination angle that vertical direction is.
3. W type flame boiler according to claim 2 is characterized in that: said weary gas blowout mouth (3) is arranged on the position near the arch aditus laryngis.
4. W type flame boiler according to claim 2 is characterized in that: said boiler comprises front wall and the back wall with full wall superheater, is equipped with at least one group of after-flame wind snout (2) and weary gas blowout mouth (3) on said front wall and the back wall.
5. W type flame boiler according to claim 4 is characterized in that: said boiler comprises that at least two group horizontal symmetrical are arranged at after-flame wind snout (2) and the weary gas blowout mouth (3) on boiler front wall and the back wall.
6. W type flame boiler according to claim 4 is characterized in that: when the full wall superheater of the front wall lower end of boiler was nearer apart from the arch of boiler, the said absolute altitude that is positioned at the after-flame wind snout (2) of front wall all was higher than the after-flame wind snout that is positioned at the back wall.
7. W type flame boiler according to claim 1 is characterized in that: the spout of said weary gas blowout mouth (3) is square, or rectangle, or circular, or oval, or the combination between them.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205140240U CN202350013U (en) | 2011-12-12 | 2011-12-12 | W-shaped flame boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205140240U CN202350013U (en) | 2011-12-12 | 2011-12-12 | W-shaped flame boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202350013U true CN202350013U (en) | 2012-07-25 |
Family
ID=46539015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205140240U Expired - Fee Related CN202350013U (en) | 2011-12-12 | 2011-12-12 | W-shaped flame boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202350013U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913299A (en) * | 2015-06-01 | 2015-09-16 | 东南大学 | W flame boiler burner and air distribution method thereof |
| CN108180469A (en) * | 2018-02-12 | 2018-06-19 | 东方电气集团东方锅炉股份有限公司 | A kind of method and apparatus for adjusting steam temperature using burner or milling waste steam processed |
| CN109340810A (en) * | 2018-11-22 | 2019-02-15 | 西安交通大学 | A kind of secondary air distribution structure reducing layer burner unburned carbon in flue dust |
| CN110645569A (en) * | 2019-11-01 | 2020-01-03 | 国电南京电力试验研究有限公司 | Combustion system and combustion method for improving flexibility of coal types of W flame boiler |
| CN111520705A (en) * | 2020-04-08 | 2020-08-11 | 哈尔滨工业大学 | Exhaust gas post-positioned W-flame boiler with arch-mounted secondary air nozzles and air distribution method |
-
2011
- 2011-12-12 CN CN2011205140240U patent/CN202350013U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104913299A (en) * | 2015-06-01 | 2015-09-16 | 东南大学 | W flame boiler burner and air distribution method thereof |
| CN108180469A (en) * | 2018-02-12 | 2018-06-19 | 东方电气集团东方锅炉股份有限公司 | A kind of method and apparatus for adjusting steam temperature using burner or milling waste steam processed |
| CN108180469B (en) * | 2018-02-12 | 2023-07-14 | 东方电气集团东方锅炉股份有限公司 | Method and device for adjusting steam temperature by using burner or powder process exhaust gas |
| CN109340810A (en) * | 2018-11-22 | 2019-02-15 | 西安交通大学 | A kind of secondary air distribution structure reducing layer burner unburned carbon in flue dust |
| CN110645569A (en) * | 2019-11-01 | 2020-01-03 | 国电南京电力试验研究有限公司 | Combustion system and combustion method for improving flexibility of coal types of W flame boiler |
| CN110645569B (en) * | 2019-11-01 | 2023-10-24 | 国能南京电力试验研究有限公司 | Combustion system and combustion method for improving flexibility of W-flame boiler coal types |
| CN111520705A (en) * | 2020-04-08 | 2020-08-11 | 哈尔滨工业大学 | Exhaust gas post-positioned W-flame boiler with arch-mounted secondary air nozzles and air distribution method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20201212 |
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| CF01 | Termination of patent right due to non-payment of annual fee |