CN203036634U - Fractional combustion low-nitrogen oxide rotational flow burner - Google Patents

Fractional combustion low-nitrogen oxide rotational flow burner Download PDF

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Publication number
CN203036634U
CN203036634U CN2012206277207U CN201220627720U CN203036634U CN 203036634 U CN203036634 U CN 203036634U CN 2012206277207 U CN2012206277207 U CN 2012206277207U CN 201220627720 U CN201220627720 U CN 201220627720U CN 203036634 U CN203036634 U CN 203036634U
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CN
China
Prior art keywords
burner
air pipe
reburning fuel
air channel
wind
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn - After Issue
Application number
CN2012206277207U
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Chinese (zh)
Inventor
蔡兴飞
孙树翁
李明
林淑胜
崔星源
刘欣
王志远
姬亚
甄晓伟
王光轩
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Yantai Longyuan Power Technology Co Ltd
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Yantai Longyuan Power Technology Co Ltd
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Priority to CN2012206277207U priority Critical patent/CN203036634U/en
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Abstract

The utility model relates to a fractional combustion low-nitrogen oxide rotational flow burner which comprises a central air pipe, wherein a primary air pipe, an inner secondary air pipe and an outer secondary air pipe are sequentially arranged on the periphery of the central air pipe from inside to outside in a concentric mode, a recrudescence fuel pipe is further arranged between the inner secondary air pipe and the outer secondary air pipe, and the recrudescence fuel pipe comprises a front portion straight segment, a middle portion bending segment and a rear portion straight segment. The front portion straight segment and the primary air pipe, the inner secondary air pipe and the outer secondary air pipe are arranged in a concentric mode, the middle portion bending segment and the rear portion straight segment extend towards the direction far away from the inner secondary air pipe, recrudescence fuel or tail portion smoke is introduced inside the recrudescence fuel pipe, and a rotational flow burner forms fractional combustion. On the basis that the fractional combustion low-nitrogen oxide rotational flow burner can ensure high efficiency and steady combustion, the fractional combustion low-nitrogen oxide rotational flow burner deeply reduces emission of NOx so as to achieve optimal combination of benefits and environment protection, and simultaneously can be industrially applied to a coal-fired power plant boiler in a large scale.

Description

A kind of low nox swirling burner of fractional combustion
Technical field
The utility model relates to controls nitrogen oxide (NO in a kind of combustion process x) turbulent burner, particularly relate to a kind of low nox swirling burner of fractional combustion.
Background technology
The acid pollution gas of coal-fired plant boiler discharging mainly comprises SO x, NO xAnd CO 2Deng.Along with the development of China's economic technology and the raising of environmental requirement, to the NO of coal-fired power station boiler xDischarging is effectively controlled, and not only have significant environmental benefit, and have great economic benefit and social benefit, be one of environmental problem that needs to be resolved hurrily at present.
Consider low NO from technology and economic angle xCombustion technology is most widely used control coal-burning boiler NO always xEmission measure, even if having to use gas denitrifying technology after the huge burning of investment and operating cost in order to satisfy discharge standard, still must adopt and hang down NO xCombustion technology reduces the NO of smoke eliminator entrance xConcentration, thus reach the purpose of saving operating cost.
Existing low NO xCombustion technology mainly comprises: low excess air combustion technology, air classification combustion technology, fuel-staged combustion technology, flue gas recirculating technique, low NO xBurner Technology etc.In above-mentioned low nitrogen burning technology, fuel fires and reduces NO xEffect be more tangible, the reburning fuel in the combustion process again can be gas (natural gas, coal gas), liquid (water-coal-slurry, oil) or solid various fuel such as (coal dust, biomass fuels).In place with good conditionsi, can adopt different fuel as reburning fuel, thereby can reduce again operation and the improvement expenses of combustion technology significantly.But fire spout again boiler setting, increased a lot of relevant devices undoubtedly, operating cost is also increased thereupon.
Flue gas recirculation mainly extracts partial fume from air preheater, directly sends into burner hearth or mix the back with a secondary wind to enter burner hearth by burner, reduces the burner hearth oxygen concentration, reduces fire box temperature, thereby reduces NO xDischarging and effectively prevent slagging scorification, but the cycling rate of flue gas recirculation to the burning stability influence bigger, regulate also very difficult.
Because low NO xBurner has technology maturation, application is easy, investment cost is little and do not increase operating cost, and having can be with above-mentioned several low NO xThe advantage that know-why combines is therefore general as reducing coal-burning boiler NO xThe one preferred technique of discharging has also obtained extensive use in coal-fired power station boiler.Many documents show low NO xBurner Technology and other independent NO xControl technology is compared, and taking all factors into consideration from denitration efficiency, investment cost, operating cost, technology maturity etc. has very big advantage.
At present, along with domestic to NO xStrictness control, low NO xThe application of burner also more and more widely, but existing low NO is to NO xControl limited, being nothing like boiler oil fires and the three-dimensional classification of air or flue gas recirculation again, and existing boiler oil fires with the three-dimensional classification of air or flue gas recirculation again also exist many problems on using, and present many power plant all thirst for having a kind ofly have both that boiler oil fires again, the three-dimensional classification of air or flue gas recirculation function and system is simple, processing ease, adjusting flexibly and can reduce NO xThe low NO of discharging xCoal burner.
The utility model content
The purpose of this utility model is to propose a kind of practicality, efficient, economic, the low nox swirling burner that can adapt to different reburning fuels or flue gas.
For achieving the above object, the utility model provides a kind of low nox swirling burner of fractional combustion, comprise central air hose, periphery at described central air hose is provided with one time airduct from inside to outside successively with one heart, interior secondary air channel, outer secondary air channel, in described secondary air channel and outside also be provided with the reburning fuel pipe between the secondary air channel, described reburning fuel pipe comprises anterior flat segments, middle bent section and rear portion flat segments, wherein, described anterior flat segments and a described airduct, interior secondary air channel and outer secondary air channel are concentric setting, and described middle bent section and rear portion flat segments are extended to the direction away from secondary air channel in described; Inner reburning fuel or the tail flue gas of feeding of described reburning fuel pipe makes turbulent burner form fractional combustion.
Preferably, secondary wind bellows in the described interior secondary air channel outside is provided with, described interior secondary wind bellows are installed in the middle bent section inboard of described reburning fuel pipe.
Preferably, also be provided with the local at least three-way pipeline that is the Y type on the described reburning fuel pipe, first end of described three-way pipeline is connected with the reburning fuel pipe, second end of three-way pipeline connects airduct by secondary wind and is connected with the big bellows of secondary wind of burner, the 3rd end of three-way pipeline is connected with the reburning fuel supply source, and is equipped with valve at described second end and the 3rd end place.
Preferably, the valve at described second end and the 3rd end place alternately opens and closes, and realizes the switching between reburning and the fractional combustion.
Preferably, feed reburning fuel or flue gas in the described reburning fuel pipe, the carrier gas of carrying described reburning fuel is air or flue gas.
Preferably, described reburning fuel comprises natural gas, fine breeze or living beings, or any several mixture in them.
Based on technique scheme, the utility model has the advantages that:
The low nox swirling burner of the utility model fractional combustion can adapt to different reburning fuels or flue gas, simultaneously can control the air quantity that secondary air box enters reburning fuel place airduct according to different combustible material again or flue gas ratio, thereby make flameholding.The utility model can guarantee in depth to reduce NO on the efficient steady combustion basis xThe discharging, to reach the optimal combination of benefit and environmental protection, for gas denitrifying technology provides good basis, simultaneously, but the utility model also large-scale industrial application in coal-fired power station boiler.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present utility model, constitutes the application's a part, and illustrative examples of the present utility model and explanation thereof are used for explaining the utility model, do not constitute improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the side cross-sectional schematic of the utility model turbulent burner;
Fig. 2 is the local schematic rear view of the utility model turbulent burner;
Fig. 3 is the cutaway view of the utility model bellows baffle plate governor motion.
The specific embodiment
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Referring to Fig. 1~Fig. 3, the preferred embodiment of the low nox swirling burner of a kind of fractional combustion of the utility model shown in it, low nox swirling burner of the present utility model comprises central air hose 13, periphery at described central air hose 13 is provided with one time airduct 3 from inside to outside successively with one heart, interior secondary air channel 4, outer secondary air channel 7, in described secondary air channel 4 and outside also be provided with reburning fuel pipe 5 between the secondary air channel 7, described reburning fuel pipe 5 comprises anterior flat segments, middle bent section and rear portion flat segments, wherein, described anterior flat segments and a described airduct 3, interior secondary air channel 4 and outer secondary air channel 7 are concentric setting, as depicted in figs. 1 and 2; Described middle bent section and rear portion flat segments are extended to the direction away from secondary air channel 4 in described, form an installing space between middle bent section, rear portion flat segments and the described interior secondary air channel 4, preferably, interior secondary wind bellows 11 at least part of this installing spaces that are arranged in interior secondary air channel 4 outsides; Described reburning fuel pipe 5 inner reburning fuel or the tail flue gas of feeding make turbulent burner form fractional combustion.
Preferably, also be provided with the local at least three-way pipeline that is the Y type on the described reburning fuel pipe 5, first end of described three-way pipeline is connected with reburning fuel pipe 5, and directly lead to the combustion zone, second end 1 of three-way pipeline connects airduct 2 by secondary wind and is connected with the big bellows of secondary wind of burner, and the big bellows of secondary wind of this burner can be the big bellows of boiler left and right sides; The 3rd end 15 of three-way pipeline is connected with the reburning fuel supply source, and is equipped with valve 14 at described second end 1 and the 3rd end 15 places.
In the process of real work, the valve 14 at described second end 1 and the 3rd end 15 places alternately opens and closes, realize the switching between reburning and the fractional combustion, valve 14 of the present utility model must be for closing dead valve, when particularly feeding natural gas, can not allow natural gas go to secondary wind and connect in the airduct 2, certainly, single valve 14 also can be regulated air quantity.
When reburning fuel pipe 5 inside fed reburning fuel or tail flue gas via the 3rd end 15, turbulent burner can form fractional combustion.
And when reburning fuel pipe 5 inside do not have reburning fuel via the secondary wind in second end, the 1 feeding secondary wind connection airduct 2, just feed one deck direct current wind, play the effect of the rapid mixing of isolated coal dust and outer secondary wind.Realize the switching between combustion again and the classification technique thus.
As shown in Figure 1, the interior secondary wind bellows 11 that have usually of burner are installed in the middle bent section inboard of described reburning fuel pipe 5.Further, have air inlet on the described interior secondary wind bellows 11, described air inlet is provided with bellows baffle plate governor motion.
Above-mentioned bellows baffle plate governor motion comprises bellows baffle plate 12, pull bar 13 and gland nut 14, and described bellows baffle plate 12 and pull bar 13 link to each other by nut, and described gland nut 14 is enclosed within on the pull bar 13.
During the utility model work, feed reburning fuel or flue gas in the described reburning fuel pipe 5, be used for realizing fractional combustion.Wherein, reburning fuel comprises natural gas, fine breeze or living beings, or any several mixture in them.
Center wind in the central air hose 13 described in the utility model can be direct current, the center wind that central air hose 13 is sent does not use when the burner normal duty moves, and be mainly used in providing the oil firing required air when burner is lighted a fire, when oil gun withdraws from blowing out, cooling off oil gun and burner, and when underload, replenish required oxygen amount.Central air hose 13 be provided with the generation that is beneficial to the recirculating zone, center, and increase wind powder air-flow and heat circumference with contacting of high-temperature flue gas, be conducive to catching fire and flameholding of coal dust.
In addition, in airduct of the utility model interior 3 swirl vane 6 is housed also preferably, can improves the coal fines circumferential direction skewness.Wind exit of burner also is provided with flame steady burner 10, and as shown in Figure 1, the coal dust that can improve a wind outlet distributes, and it is stable to be conducive to coal powder ignition.
Further, in the present embodiment, the rear portion of an airduct 3 is provided with the air intake elbow, as shown in Figure 1, simultaneously in conjunction with described swirl vane 6, can improve or avoid the situation of coal fines circumferential direction skewness effectively; The disturbance that also can increase pulverized coal particle and high-temperature flue gas simultaneously with mix, be conducive to conflagration, the wind rate of a wind is generally 16% ~ 24%; Airduct 3 exits of burner are provided with flame steady burner 10, and the coal dust that can improve a wind outlet distributes, and it is stable to be conducive to coal powder ignition.
The air inlet place of secondary air channel 4, outer secondary air channel 7 is provided with swirl vane in described in the utility model.Can regulate by the adjusting swirl vane and select and remain, make outer secondary air channel 7, interior secondary air channel 4 produces direct current or the variable secondary wind of swirl strength.
Reburning fuel pipe 5 described in the utility model can be direct current or eddy flow, also can be used for feeding reburning fuel or flue gas according to the actual conditions of power plant, well show the fractional combustion of fuel or air, the reburning fuel of feeding can be gas (natural gas, coal gas), liquid (water-coal-slurry, oil) or solid various fuel such as (coal dust, biomass fuels); The flue gas that feeds also can be the flue gas that attracts from boiler tail, perhaps can be the CO that obtains from other remote locations 2/ O 2The gas that ratio is higher.
In addition, interior secondary air channel 4, reburning fuel pipe 5 and outer secondary air channel 7 ports of export are equipped with taper and expand angle 9, as shown in Figure 1,9 pairs of air-flows in taper expansion angle of the above-mentioned port of export play guide functions to a certain degree, increasing flaring angle can make the recirculating zone widen, increase the contact area of recirculating zone and high-temperature flue gas, the expanded-angle that angle 9 is expanded in described taper is 5~45 °
The air inlet of interior secondary air channel 4, outer secondary air channel 7 is provided with swirl vane, and the blade number of swirl strength is 0~40, and swirl vane and burner axis are angled 5~85 °.
Secondary wind bellows 11 in interior secondary air channel 4 outer being socketed with, interior secondary wind bellows 11 middle parts all have a plurality of air inlets, and (this air inlet is preferably rectangle, can certainly be other shapes), air inlet evenly distributes on interior secondary wind bellows 11, quantity is 4 ~ 10, interior secondary wind bellows 11, reburning fuel pipe 5 are provided with bellows baffle plate governor motion, and bellows baffle plate governor motion is made up of bellows baffle plate 12, pull bar 13 and gland nut 14, as shown in Figure 3; Bellows baffle plate 12 and pull bar 13 link to each other by nut, and gland nut 14 is enclosed within on the pull bar.Bellows baffle plate 12 comes adjusting position by pull bar 13, is locked on its position with gland nut 14 at last.Bellows baffle plate 12 is one, and sleeve is equipped with runner around bellows external diameter one all sleeves, and the position of sleeve is regulated by pull bar 13.Sleeve length vertically be on the bellows rectangular opening length 4/3.Regulate the air quantity that enters interior secondary air channel 4, reburning fuel pipe 5 and outer secondary air channel 7 by regulating bellows baffle plate governor motion 12.
When bellows baffle plate 12 covers the rectangle air inlet entirely, intake is minimum, intake maximum when bellows baffle plate 12 leaves the rectangle air inlet entirely.Be locked on its position with gland nut 14 at last after bellows baffle plate 12 set positions.In the time of to each airduct air quantity size adjustment, can make the secondary wind swirl strength that enters airduct unaffected by regulating the eddy flow governor motion.The wind rate of interior secondary wind is generally 12 ~ 13%; The wind rate of middle secondary wind is 15 ~ 27%; The wind rate of outer secondary wind is 30 ~ 45%.
The utility model provides a cover practical, efficient, economic low NO xTurbulent burner, its denitration efficiency can reach more than 50%.The utility model also has following characteristics:
1) the interior secondary wind in secondary air box and outside the reburning fuel pipe that feeds reburning fuel or tail flue gas is set between the secondary wind, can realize that similar boiler oil fires again or the combustion efficiency of flue gas recirculation.
2) the utility model can be according to ature of coal, and is better in ature of coal, NO xIn the time of lower, the combustion cartridge can not feed reburning fuel, but bubbling air is realized fractional combustion.
3) fractional combustion of the utility model turbulent burner formation is obviously strengthened, and makes fuel type NO xReduce significantly.
4) by regulating bellows baffle plate governor motion, the air quantity that gets final product internal secondary air channel, reburning fuel pipe and outer secondary air channel is regulated, thereby adapts to the variation of coal and load.Can not influence the swirl strength of airduct to the adjusting of each airduct air quantity.
5) reburning fuel wide accommodation of the present utility model, gas (natural gas, coal gas), liquid (water-coal-slurry, oil) or solid various fuel such as (coal dust, biomass fuels), and the flue gas that feeds can be the flue gas that attracts from boiler tail, also can be the CO that obtains from other places 2/ O 2The gas that ratio is higher.
6) carrier gas of carrying reburning fuel both can be air, also can be flue gas, can also be other gases.
7) only depend on burner just can realize the combustion again of fuel, or flue gas recirculation, be different from boiler and fire and also need increase equipment, therefore, the utility model has reduced a lot of expenses.
The structure that the utlity model has has better realized low NO xThe fuel staging technology of turbulent burner and air classification technology, thus can satisfy the needs of stablizing different coals and reduce NO to greatest extent xGeneration.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit; Although with reference to preferred embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or the part technical characterictic is equal to replacement the specific embodiment of the present utility model; And not breaking away 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 (5)

1. the low nox swirling burner of a fractional combustion, comprise central air hose (13), periphery at described central air hose (13) is provided with an airduct (3) from inside to outside successively with one heart, interior secondary air channel (4), outer secondary air channel (7), it is characterized in that: secondary air channel in described (4) and outside also be provided with reburning fuel pipe (5) between the secondary air channel (7), described reburning fuel pipe (5) comprises anterior flat segments, middle bent section and rear portion flat segments, wherein, described anterior flat segments and a described airduct (3), interior secondary air channel (4) and outer secondary air channel (7) are concentric setting, and described middle bent section and rear portion flat segments are extended to the direction away from secondary air channel (4) in described; Inner reburning fuel or the tail flue gas of feeding of described reburning fuel pipe (5) makes turbulent burner form fractional combustion.
2. low nox swirling burner according to claim 1, it is characterized in that: secondary wind bellows (11) in secondary air channel (4) outside is provided with in described, described interior secondary wind bellows (11) are installed in the middle bent section inboard of described reburning fuel pipe (5).
3. low nox swirling burner according to claim 1, it is characterized in that: also be provided with the local at least three-way pipeline that is the Y type on the described reburning fuel pipe (5), first end of described three-way pipeline is connected with reburning fuel pipe (5), second end (1) of three-way pipeline connects airduct (2) by secondary wind and is connected with the big bellows of secondary wind of burner, the 3rd end (15) of three-way pipeline is connected with the reburning fuel supply source, and locates to be equipped with valve (14) at described second end (1) and the 3rd end (15).
4. low nox swirling burner according to claim 3 is characterized in that: the valve (14) that described second end (1) and the 3rd end (15) are located alternately opens and closes, and realizes the switching between reburning and the fractional combustion.
5. low nox swirling burner according to claim 1 is characterized in that: feed reburning fuel or flue gas in the described reburning fuel pipe (5), the carrier gas of carrying described reburning fuel is air or flue gas.
CN2012206277207U 2012-11-21 2012-11-21 Fractional combustion low-nitrogen oxide rotational flow burner Withdrawn - After Issue CN203036634U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103411220A (en) * 2013-07-25 2013-11-27 江联重工股份有限公司 Big heating value difference double-fuel gas double-swirl burner
CN103528059A (en) * 2013-11-12 2014-01-22 哈尔滨前程科技发展有限公司 Multifunction substep high-oxygen combustor for industrial furnace
CN103836621A (en) * 2012-11-21 2014-06-04 烟台龙源电力技术股份有限公司 Graded burning low-NOx turbulent burner
CN105276605A (en) * 2014-07-04 2016-01-27 烟台龙源电力技术股份有限公司 Coal-fired boiler and combustion method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103836621A (en) * 2012-11-21 2014-06-04 烟台龙源电力技术股份有限公司 Graded burning low-NOx turbulent burner
CN103836621B (en) * 2012-11-21 2016-08-03 烟台龙源电力技术股份有限公司 A kind of low nitrogen oxide swirling burner of fractional combustion
CN103411220A (en) * 2013-07-25 2013-11-27 江联重工股份有限公司 Big heating value difference double-fuel gas double-swirl burner
CN103528059A (en) * 2013-11-12 2014-01-22 哈尔滨前程科技发展有限公司 Multifunction substep high-oxygen combustor for industrial furnace
CN105276605A (en) * 2014-07-04 2016-01-27 烟台龙源电力技术股份有限公司 Coal-fired boiler and combustion method thereof

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C25 Abandonment of patent right or utility model to avoid double patenting
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Granted publication date: 20130703

Effective date of abandoning: 20160803