CN208457958U - Based on the low NOx gas burner recycled in combustion gas - Google Patents
Based on the low NOx gas burner recycled in combustion gas Download PDFInfo
- Publication number
- CN208457958U CN208457958U CN201820800842.9U CN201820800842U CN208457958U CN 208457958 U CN208457958 U CN 208457958U CN 201820800842 U CN201820800842 U CN 201820800842U CN 208457958 U CN208457958 U CN 208457958U
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- gas
- air channel
- pipeline section
- recycled
- flue gas
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Abstract
The utility model discloses a kind of based on the low NO recycled in combustion gasxGas burner belongs to gas fuel combustion technical field.The utility model includes fuel gas conduit and secondary air channel, and the exit of the secondary air channel is provided with steady combustion disk, and the secondary air channel is made of Secondary Air entrance pipeline section and Venturi type shaped telescopic tube pipeline section;The aditus laryngis of the Venturi type shaped telescopic tube pipeline section in boiler furnace is equipped with interior circulating flue gas entrance.Without gas recirculating fan and flue, by flue gas inner loop mode, the ratio of circulating flue gas is 5%-20%, has reached the flue gas recirculation ratio of outer circulation method, has made the NO of burner or boilerxDischarge value is low.
Description
Technical field
It is the utility model relates to gas fuel combustion technical field, in particular to a kind of based on the low NO recycled in combustion gasx
Gas burner.
Background technique
With the increasingly failure of coal resources, in addition coal-fired process can discharge a large amount of NOxPollutant has very big harm
Property, therefore China is increasingly considered using the more clean gaseous fuel such as natural gas in terms of using energy source at present.
Although natural gas is substantially free of sulphur and dust, sulfur dioxide and dust pollution object are not discharged, in combustion process
In can still generate NOx, also there is certain pollution to atmosphere.
In order to which environmental protection needs, various countries have developed various low NOxThe technology of gas burner, use mainly has air
Classification, fuel staging, premixed combustion and flue gas recirculation etc..With the increasingly raising of environmental requirement, at present to gas burner
Generally require NOxDischarge is lower than 30mg/Nm3.Great mass of data shows to reach so low NOxDischarge value, flue gas recirculation
It is essential Mitigation options.On the one hand combustion peak temperature can be reduced, on the other hand also reduces oxygen concentration in furnace,
Advantageously reduce NOxDischarge.
There are two types of flue gas recirculation is general, the first is outer circulation, that is, passes through flue for the cigarette of boiler tail
Gas introduces burner inlet, which is easiest to implement, significant effect, and internal circulating load is controllable.Disadvantage is then to increase investment and fortune
Row cost needs to add expensive high-temperature blower, and flue gas recycled pipeline is easy to happen low-temperature corrosion, influences the reliable of boiler
Property.
Second method is interior circulation, has many burners to rationally design spout, produces flue gas near spout
Raw recirculating zone, allows the flue gas of reflux to mix with fresh gas-air, and equally also can achieve reduces NOxThe effect of discharge.It produces
The method of raw recirculating zone is usually the eddy flow for utilizing burner outlet, however, actually since swirl strength is weak, it is negative to be formed
Press not high enough, therefore the exhaust gas volumn of interior circulation is seldom, it is difficult to which generating significant reduces NOxThe effect of discharge.Generally can only at present
It is used as supplementary means.
Utility model content
In order to make up for the deficiencies of the prior art, the utility model provides a kind of based on the low NO recycled in combustion gasxCombustion gas
Burner.
The technical solution of the utility model are as follows:
It is a kind of based on the low NO recycled in combustion gasxGas burner, including fuel gas conduit and secondary air channel, the Secondary Air
The exit in channel is provided with steady combustion disk, and the secondary air channel is by Secondary Air entrance pipeline section and Venturi type shaped telescopic tube pipeline section structure
At;The aditus laryngis of the Venturi type shaped telescopic tube pipeline section in boiler furnace is equipped with interior circulating flue gas entrance.
Preferably, the angle of the Venturi type shaped telescopic tube pipeline section upstream necking is 20-30 °, downstream flaring
Angle is 10-20 °.When the Venturi type shaped telescopic tube pipeline section is set as the scalable manner, Venturi type shaped telescopic tube pipeline section
Larger negative pressure can be formed at aditus laryngis, with the flue gas introduced in more boiler furnace.
Preferably, the end of the fuel gas conduit is located at the aditus laryngis of the Venturi type shaped telescopic tube pipeline section.Combustion gas
It is premixed with Secondary Air (air) in gullet section, advantageously reduces NOxDischarge;In addition it can guarantee gas flow rate at aditus laryngis, into
One step, which increases, is formed by negative pressure at aditus laryngis.
Preferably, the secondary air channel includes inner second air channel and covers outside the inner second air channel
Outer second air channel;The inner second air channel is made of inner second air entrance pipeline section and interior Venturi type shaped telescopic tube pipeline section;
The outer second air channel is made of outer second air entrance pipeline section and outer Venturi type shaped telescopic tube pipeline section.Outer second air is to entire combustion
Burner has cooling effect, and burner operation condition is good, long service life.General secondary air channel is arranged two, certainly may be used
With setting one or three, it is set as needed.
Further, the exit in the inner second air channel and/or outer second air channel is disposed with Secondary Air eddy flow leaf
Piece.Secondary Air swirl vane is set and further increases negative pressure in combustion chamber.
Preferably, interior circulating flue gas entrance is provided on the inner second air channel and outer second air channel;
And the interior circulating flue gas entrance on the inner second air channel and outer second air channel is oppositely arranged;It is interior on outer second air channel
Circulating flue gas channel in being formed between interior circulating flue gas entrance on circulating flue gas entrance and inner second air channel.The setting is convenient for
Flue gas in boiler furnace enters burner.
Preferably, the interior circulating flue gas entrance is square hole or circular hole.The big rootlet of interior circulating flue gas entrance
It is designed according to actual needs, is that standard is set using the exhaust gas volumn entered by interior circulating flue gas entrance as the 5%-20% of amount of flue gas emission in burner hearth
Meter.
Using described based on the low NO recycled in combustion gasxGas burner reduces boiler NOxThe method of discharge, by the base
In the low NO recycled in combustion gasxGas burner is installed on boiler, is located at pot at the aditus laryngis of the Venturi type shaped telescopic tube pipeline section
In furnace burner hearth, it is passed through combustion gas in fuel gas conduit, Secondary Air, the aditus laryngis of the Venturi type shaped telescopic tube pipeline section are passed through in secondary air channel
Place will form negative pressure, and the flue gas in burner hearth is entered in the secondary air channel by the interior circulating flue gas entrance, with Secondary Air
And combustion gas mixing, the introducing of flue gas reduce oxygen amount and ignition temperature when burning, inhibit NOxGeneration.
Preferably, gas flow rate is 100-200m/s at the aditus laryngis of the Venturi type shaped telescopic tube pipeline section;By institute
State the 5%-20% that the exhaust gas volumn that interior circulating flue gas entrance enters is amount of flue gas emission in burner hearth.
Preferably, the gas flow rate of the fuel gas conduit outlet is 80-200m/s.
The utility model has the following beneficial effects:
1, it is not necessarily to gas recirculating fan and flue, by flue gas inner loop mode, the ratio of circulating flue gas is 5%-
20%, reach the flue gas recirculation ratio of outer circulation method, has made the NO of burner or boilerxDischarge value is low.
2, combustion gas and Secondary Air (air) are premixed in gullet section, advantageously reduce NOxDischarge.
3, outer second air has cooling effect to entire burner, and burner operation condition is good, long service life.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the utility model based on the low NO recycled in combustion gasxThe structural schematic diagram of gas burner;
Fig. 2 is embodiment 2 based on the low NO recycled in combustion gasxThe structural schematic diagram of gas burner.
In figure, 1- fuel gas conduit;2- inner second air channel;3- outer second air channel;The outer Venturi type shaped telescopic tube pipeline section of 4-;5-
Interior circulating flue gas access road;6- outer second air swirl vane;7- flame;8- surely fires disk;Venturi type shaped telescopic tube pipeline section in 9-;
10- furnace wall.
Specific embodiment
Embodiment 1
As shown in Figure 1, a kind of based on the low NO recycled in combustion gasxGas burner, including fuel gas conduit 1, interior twice aeration
Road 2, outer secondary ventilating ducting 3,3 sets of the outer secondary ventilating ducting outsides in interior secondary ventilating ducting 2.Interior secondary ventilating ducting 2 and outer secondary
The exit of ventilating duct 3 is provided with steady combustion disk 8, and flame 7 is sprayed by surely firing disk 8.Steady combustion disk 8 is made by heat resisting steel.
Wherein, inner second air channel 2 is made of inner second air entrance pipeline section and interior Venturi type shaped telescopic tube pipeline section 9.Outer two
Secondary wind channel 3 is made of outer second air entrance pipeline section and outer Venturi type shaped telescopic tube pipeline section 4.It is secondary in outer second air channel 3
Wind has cooling effect to entire burner, and burner operation condition is good, long service life.Interior Venturi type shaped telescopic tube pipeline section 9
Left side flushed with the left side of outer Venturi type shaped telescopic tube pipeline section 4;The right side of interior Venturi type shaped telescopic tube pipeline section 9 and outer
The right side of Venturi type shaped telescopic tube pipeline section 4 flushes.
Fuel gas conduit 1 is located at the center in inner second air channel 2, and the end of fuel gas conduit 1 is located at interior Venturi type shaped telescopic tube
At the aditus laryngis of pipeline section 9.The end of fuel gas conduit 1, which is located at the aditus laryngis of interior Venturi type shaped telescopic tube pipeline section 9, can preferably be conducive to drop
Low NOxDischarge.
The angle of interior 9 upstream necking of Venturi type shaped telescopic tube pipeline section is 20-30 °, and the angle of downstream flaring is 10-20 °;Outside
The angle of 4 upstream necking of Venturi type shaped telescopic tube pipeline section is 20-30 °, and the angle of downstream flaring is 10-20 °.Interior Venturi type contracting
Put pipe pipeline section 9 and the upstream necking angle of outer Venturi type shaped telescopic tube pipeline section 4 and downstream flaring angle can it is identical can also be with
Slightly difference.
Interior circulating flue gas entrance, outer Venturi type shaped telescopic tube pipe are provided at the aditus laryngis of interior Venturi type shaped telescopic tube pipeline section 9
Interior circulating flue gas entrance is also equipped at the aditus laryngis of section 4;Interior circulating flue gas entrance can be for rectangular or round or other are convenient for
The shape that interior circulating flue gas passes through.Interior circulating flue gas entrance and outer Venturi type on interior Venturi type shaped telescopic tube pipeline section 9 scale
The interior circulating flue gas entrance of pipe pipeline section 4 is oppositely arranged, interior circulating flue gas entrance and foreign language on interior Venturi type shaped telescopic tube pipeline section 9
Circulating flue gas inlet duct 5 in being formed between the interior circulating flue gas entrance of type shaped telescopic tube pipeline section 4 in mound.By adjusting interior circulation cigarette
The adjustable flue gas recycled amount of the internal diameter of gas inlet duct 5.According to engineering experience and calculating, under normal circumstances, when interior circulation
When total draught area of smoke inlet pipelines 5 is the 10%-20% of venturi shaped telescopic tube larynx mouth area, flue gas recycled amount ratio
About 5%~20%.
In order to preferably increase the indoor negative pressure of burning, outer second air eddy flow is disposed in the end of outer secondary air channel 3
Blade 6.Certainly, the end in inner second air channel 2 can also install inner second air swirl vane.
Using above-mentioned based on the low NO recycled in combustion gasxGas burner reduces boiler NOxThe method of discharge, will be based on combustion
The low NO recycled in gasxGas burner is installed on boiler, interior Venturi type shaped telescopic tube pipeline section 9 and outer Venturi type shaped telescopic tube pipe
It is located in boiler furnace at the aditus laryngis of section 4 (position of furnace wall 10 as shown in Figure 1 is a kind of embodiment), is passed through in fuel gas conduit 1
Combustion gas, it is 80-200m/s that combustion gas, which is passed through the gas flow rate that speed can guarantee that fuel gas conduit 1 exports,;Inner second air channel 2 and outer secondary
It is passed through Secondary Air in wind channel 3, will form negative pressure, the 5%- in boiler furnace at the aditus laryngis of interior Venturi type shaped telescopic tube pipeline section 9
20% flue gas is entered in inner second air channel 2 by interior circulating flue gas inlet duct 5, with Secondary Air and combustion gas mixing, Nei Wenqiu
In type shaped telescopic tube pipeline section 9 aditus laryngis at gas flow rate be 100-200m/s;The introducing of flue gas makes the oxygen amount and burning temperature when burning
Degree reduces, and inhibits NOxGeneration.
The present embodiment only gives the nuclear structure of the utility model burner, fuel gas conduit 1, inner second air channel 2, outer two
Secondary wind channel 3, steady combustion disk 8 are connected as there are many modes of an entirety, and fuel gas conduit 1, inner second air channel 2, outer second air
Channel 3, steady combustion disk 8 must be connected as it is known in the art, for example, using lasso, the fuel gas conduit 1, inner second air channel is supported
2, outer second air channel 3 is by support ferrule supports, and surely fires disk 8 and pass through inner second air channel 2,3 end of outer second air channel
Bindiny mechanism be connected to the end in inner second air channel 2, outer second air channel 3.Fuel gas conduit 1, inner second air channel 2, outer two
The mode that secondary wind channel 3, steady combustion disk 8 are connected as an entirety is not the innovative point place of the utility model, other are connected as
Whole mode no longer gives an example.
The burner of the present embodiment is used for general horizontal small Industrial Boiler and large-scale electricity generation boiler, NOxReduce
To 50~80 mg/Nm3。
And when general horizontal small Industrial Boiler and large-scale electricity generation boiler use existing normal burner at present, NOxRow
Putting value is 120~200 mg/Nm3。
Embodiment 2
As shown in Fig. 2, the utility model can make further modification, secondary air channel is reduced to a channel (i.e.
By in embodiment 1 inner second air channel and the outer second air channel channel Liang Ge be reduced to a channel), at this time due to burner
Venturi shaped telescopic tube pipeline section presence, remain to generate very strong flue gas recirculation effect, can equally generate very strong reduction
NOx emission effect.This case study on implementation is primarily adapted for use in the burner that power is lower, gas quantity is few.
Claims (7)
1. a kind of based on the low NO recycled in combustion gasxGas burner, including fuel gas conduit and secondary air channel, the Secondary Air are logical
The exit in road is provided with steady combustion disk, it is characterised in that: the secondary air channel is contracted by Secondary Air entrance pipeline section and Venturi type
Put pipe pipeline section composition;The aditus laryngis of the Venturi type shaped telescopic tube pipeline section in boiler furnace is equipped with interior circulating flue gas and enters
Mouthful.
2. as described in claim 1 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the Venturi type contracting
The angle for putting the upstream necking of pipe pipeline section is 20-30 °, and the angle of downstream flaring is 10-20 °.
3. as described in claim 1 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the end of the fuel gas conduit
End is located at the aditus laryngis of the Venturi type shaped telescopic tube pipeline section.
4. as described in claim 1 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the secondary air channel
Including inner second air channel and cover the outer second air channel outside the inner second air channel;The inner second air channel is by interior
Secondary Air entrance pipeline section and interior Venturi type shaped telescopic tube pipeline section are constituted;The outer second air channel by outer second air entrance pipeline section and
Outer Venturi type shaped telescopic tube pipeline section is constituted.
5. as claimed in claim 4 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the inner second air is logical
The exit in road and/or outer second air channel is disposed with Secondary Air swirl vane.
6. as claimed in claim 4 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the inner second air is logical
Interior circulating flue gas entrance is provided on road and outer second air channel;And on the inner second air channel and outer second air channel
Interior circulating flue gas entrance is oppositely arranged;The interior circulation on interior circulating flue gas entrance and inner second air channel on outer second air channel
Circulating flue gas channel in being formed between smoke inlet.
7. as claimed in claim 1 or 6 based on the low NO recycled in combustion gasxGas burner, it is characterised in that: the interior circulation
Smoke inlet is square hole or circular hole.
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CN201820800842.9U CN208457958U (en) | 2018-05-28 | 2018-05-28 | Based on the low NOx gas burner recycled in combustion gas |
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CN201820800842.9U CN208457958U (en) | 2018-05-28 | 2018-05-28 | Based on the low NOx gas burner recycled in combustion gas |
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108506935A (en) * | 2018-05-28 | 2018-09-07 | 杭州浙大天元科技有限公司 | Based on the low NOx gas burners recycled in combustion gas and the method for reducing discharge |
CN111442270A (en) * | 2020-04-03 | 2020-07-24 | 唐山冀东石油机械有限责任公司 | Flue gas inner loop low-nitrogen gas burner |
CN111442271A (en) * | 2020-04-03 | 2020-07-24 | 唐山冀东石油机械有限责任公司 | Flue gas inner loop low NOx burner |
CN115406100A (en) * | 2022-09-05 | 2022-11-29 | 南京宜热纵联节能科技有限公司 | Indirect heat exchange type hot blast stove |
-
2018
- 2018-05-28 CN CN201820800842.9U patent/CN208457958U/en active Active
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108506935A (en) * | 2018-05-28 | 2018-09-07 | 杭州浙大天元科技有限公司 | Based on the low NOx gas burners recycled in combustion gas and the method for reducing discharge |
CN108506935B (en) * | 2018-05-28 | 2024-08-30 | 杭州浙大天元科技有限公司 | Low NOx gas burner based on gas internal circulation and method for reducing emission |
CN111442270A (en) * | 2020-04-03 | 2020-07-24 | 唐山冀东石油机械有限责任公司 | Flue gas inner loop low-nitrogen gas burner |
CN111442271A (en) * | 2020-04-03 | 2020-07-24 | 唐山冀东石油机械有限责任公司 | Flue gas inner loop low NOx burner |
CN115406100A (en) * | 2022-09-05 | 2022-11-29 | 南京宜热纵联节能科技有限公司 | Indirect heat exchange type hot blast stove |
CN115406100B (en) * | 2022-09-05 | 2024-01-12 | 南京宜热纵联节能科技有限公司 | Indirect heat exchange type hot blast stove |
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