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 PDF

Info

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
Authority
CN
China
Prior art keywords
gas
air channel
air
recycled
pipeline
Prior art date
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.)
Active
Application number
CN201820800842.9U
Other languages
Chinese (zh)
Inventor
方毅波
张光学
严志雄
陈力
施嘉能
杜志华
俞海玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd
Original Assignee
HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd filed Critical HANGZHOU ZJU TIANYUAN TECHNOLOGY Co Ltd
Priority to CN201820800842.9U priority Critical patent/CN208457958U/en
Application granted granted Critical
Publication of CN208457958U publication Critical patent/CN208457958U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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

Based on the low NOx gas burner recycled in combustion gas
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.
CN201820800842.9U 2018-05-28 2018-05-28 Based on the low NOx gas burner recycled in combustion gas Active CN208457958U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201820800842.9U CN208457958U (en) 2018-05-28 2018-05-28 Based on the low NOx gas burner recycled in combustion gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201820800842.9U CN208457958U (en) 2018-05-28 2018-05-28 Based on the low NOx gas burner recycled in combustion gas

Publications (1)

Publication Number Publication Date
CN208457958U true CN208457958U (en) 2019-02-01

Family

ID=65149031

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201820800842.9U Active CN208457958U (en) 2018-05-28 2018-05-28 Based on the low NOx gas burner recycled in combustion gas

Country Status (1)

Country Link
CN (1) CN208457958U (en)

Similar Documents

Publication Publication Date Title
CN107606606B (en) Central powder feeding omega-shaped industrial pulverized coal boiler adopting flue gas recirculation
CN101825278B (en) Oxygen-rich combustor
CN106247368B (en) A kind of industrial coal powder boiler flue gas recirculation low nitrogen burning method and system
CN204987009U (en) Wide in range high -efficient low NOx burner
CN105465780A (en) Ultralow NOx pulverized coal burner
CN103629663B (en) Vortex burner
CN104180368A (en) Medium-and-low temperature hot fume powder feeding type coal powder combustion device and combustion process thereof
Wang et al. Effects of secondary air distribution in primary combustion zone on combustion and NOx emissions of a large-scale down-fired boiler with air staging
CN103836621B (en) A kind of low nitrogen oxide swirling burner of fractional combustion
CN203036634U (en) Fractional combustion low-nitrogen oxide rotational flow burner
CN108506935A (en) Based on the low NOx gas burners recycled in combustion gas and the method for reducing discharge
CN108413382A (en) A kind of burner for individually burning or being mixed and burned for biomass and natural gas
CN208457958U (en) Based on the low NOx gas burner recycled in combustion gas
CN102705818B (en) Wall-attached wind distribution method of boiler combustor
CN204756916U (en) Brown coal cyclone burner with prevent burnt wind
CN204987008U (en) Bispin STREAMING low heat value gas combustion ware
CN111442263A (en) Cyclone burner suitable for pulverized coal concentration separation of lignite
CN111450681A (en) Denitration, desulfurization and dust removal integrated system for supercritical carbon dioxide coal-fired boiler
CN208418701U (en) A kind of low-NOx combustor for biomass and combustion of natural gas
CN208901632U (en) A kind of energy-saving hot air stove
CN208779450U (en) A kind of ultralow NOX combustion system and its burner of low-load combustion-stabilizing
CN206739256U (en) A kind of single backhaul WNS structure boilers
CN206300215U (en) A kind of system of utilization biomass gasified gas combustion heating SCR inlet flue gas
CN106287667B (en) A kind of high temperature gases recirculating preheating type low-NOx combustor equipped with SOFA
CN205919314U (en) Double -furnace thorax coal powder gasification low -nitrogen combustion industrial boiler

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant