CN109737397A - Multi-mode cyclone classification air distribution fuel oil low NOx combustion method and its device - Google Patents
Multi-mode cyclone classification air distribution fuel oil low NOx combustion method and its device Download PDFInfo
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- CN109737397A CN109737397A CN201910087503.XA CN201910087503A CN109737397A CN 109737397 A CN109737397 A CN 109737397A CN 201910087503 A CN201910087503 A CN 201910087503A CN 109737397 A CN109737397 A CN 109737397A
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- air
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- low nox
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a kind of multi-mode cyclone classification air distribution fuel oil low NOx combustion method and its devices, the burner is made of central tube, inner second air pipe and outer second air pipe, center arrangement oil burner nozzle in central tube, igniter is arranged between the central tube and the oil burner nozzle, the oil burner nozzle outlet is concordant with the exit end face of the central tube, arrangement inner swirler and venturi nozzle in the inner second air pipe, the outlet of the central tube is concordant with the exit end face of inner second air pipe, arrangement aperture-type regulating valve and outer swirler in the outer second air pipe.The device can be run with Three models such as flaming combustion, transition flame and flameless combustions, in boiler startup and underrun stage, the burner is in flaming combustion mode, use air for oxidant, pass through the adjusting of inside and outside swirl secondary air amount as oxidant in steady and heavy-duty service stage, flue gas air mixture, burner is set to be transformed into flameless combustion mode by transition flame from flaming combustion mode, oil burning boiler NOx emission concentration is reduced to 30mg/m3(O2=3.5%) within.
Description
Technical field
The invention belongs to Thermal Power Engineering field of combustion technology, it is related to a kind of low NOx combustion of multi-mode cyclone classification air distribution fuel oil
Burn device.
Background technique
Currently, fuel burning reduces NOx emission concentration using the methods of air classification, fuel staging, flue gas recirculation
To less than 120mg/Nm3It is extremely difficult.
Depth flue gas recirculation fuel oil low NOx combustion apparatus is using outer circulation flue gas multiplying power (and the ratio of air burning exhaust gas volumn
Value) it be 25%~80% flue gas air mixture is oxidant, eddy flow venturi nozzle multiple jet flow is strengthened to follow in inner flue gas of the stove
Ring, the structural parameters and operating parameter tissue transition flame combustion mode of the burner make the reduction of oil burning boiler NOx emission concentration
To 50mg/m3(O2=3.5%) within.
Summary of the invention
The purpose of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus (burner) of the present invention is that the burner can be with
Organize three kinds of methods of operation such as flaming combustion mode, transition flame status and flameless combustion mode.By oxidant constituents and
The adjusting of inside and outside secondary air flow makes burner be transformed into flameless combustion mode by transition flame from flaming combustion mode, thus
Oil burning boiler NOx emission concentration is reduced to 30mg/m3(O2=3.5%) within.
To achieve the goals above, the technical solution adopted by the present invention specifically includes that
In boiler startup or underrun, burner (burner) the tissue flaming combustion mode, using air
For oxidant, the 80%~90% of the total volume of air supply of inward eddy secondary air flow Zhan, the total volume of air supply of contour stealth Secondary Air Zhan 10%~
20%, axial jet component velocity is less than 15m/s.When the burner runs on transition flame, use flue gas air mixture for
Oxidant, flue gas account for the 20%~60% of fuel-air combustion product gases amount, the total volume of air supply of inward eddy secondary air flow Zhan 70%~
The 20%~30% of the total volume of air supply of 80%, contour stealth Secondary Air Zhan, axial jet component velocity are less than 25m/s.Burner fortune
For row when non flame combustion mode, furnace exit temperature is greater than 850 DEG C, uses flue gas air mixture for oxidant, flue gas accounts for combustion
The 50%~120% of oily air burning exhaust gas volumn, the 20%~40% of the total volume of air supply of inward eddy secondary air flow Zhan, contour stealth is secondary
The 60%~80% of the total volume of air supply of wind Zhan, axial jet component velocity are less than 30m/s.
The present invention provides a kind of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus (burner), comprising:
It is made of central tube, inner second air pipe and outer second air pipe, center arrangement oil burner nozzle in the central tube, described
Igniter is arranged between central tube and the oil burner nozzle, oil burner nozzle outlet is concordant with the exit end face of central tube.Inner second air pipe
Interior arrangement inner swirler and venturi nozzle, central tube outlet are concordant with inner second air exit end face.Arrangement in outer second air pipe
Aperture-type regulating valve and outer swirler.
The speed of oil burner nozzle surrounding direct current wind is 5m/s~15m/s in the central tube of the burner.
The swirling number of the inner second air of the burner is 0.8~1.4, the length L of venturi nozzle be 0DN~
1.05DN (Diameter Nominal, the nominal diameter of inner second air outer cylinder, unit: mm), height H are 0DN~0.3DN, receipts
Contracting angle α is 35 °~55 °, angle of flare β is 45 °~75 °, the flaring angle β of inner second air outer cylinder1For 45 °~75 °, flaring depth
For 0.08DN~0.12DN.
The swirling number of the outer second air of the burner is 0.6~1.2, the flaring angle β of outer second air outer cylinder2For
25 °~55 °, flaring depth be 0.16DN~0.24DN.The apex angle γ of pyrometric cone is 15 °~25 ° between interior outer second air.
Detailed description of the invention
Fig. 1 is multi-mode cyclone classification air distribution fuel oil low NOx combustion system schematic diagram；
Fig. 2 is a direction structure schematic diagram (main view) of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus；
Fig. 3 is the other direction structural schematic diagram (left view) of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus；
Fig. 4 is the another direction structure schematic diagram (right view) of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus.
In figure: 100- boiler；200- burner；300- air blower；400- flue gas air mixing device；500- first is electronic
Regulating valve；The second electric control valve of 600-；700- flue gas recirculation pipe；800- third electric control valve；201- circle becomes square joint；
202- central tube；203- inner swirler；204- outer swirler；205- venturi nozzle；206- oil burner nozzle；207- aperture-type is adjusted
Valve；The flaring of 208- inner second air outer cylinder；209- outer second air pipe；210- inner second air pipe.
Specific embodiment
The present invention is described in further detail for illustrated embodiment with reference to the accompanying drawing.
A kind of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus 200, i.e. burner 200, burner include
Central tube, inner second air pipe and outer second air pipe, center arrangement oil burner nozzle in the central tube, in the central tube and the oil
Igniter is arranged between nozzle, the oil burner nozzle outlet is concordant with the exit end face of the central tube, in the inner second air pipe
Arrange inner swirler and venturi nozzle, the outlet of the central tube is concordant with the exit end face of inner second air pipe, and described outer two
Arrangement aperture-type regulating valve and outer swirler in secondary air hose.
The speed of oil burner nozzle surrounding direct current wind is 5m/s~15m/s in the central tube in one of the embodiments,.
The swirling number of the inner second air pipe is 0.8~1.4 in one of the embodiments, the venturi nozzle
Length L is 0DN~1.05DN (Diameter Nominal, the nominal diameter of inner second air outer cylinder, unit: mm), height H is
0DN~0.3DN, angle of throat α are 35 °~55 °, angle of flare β is 45 °~75 °, and the flaring angle β 1 of the inner second air pipe is
45 °~75 °, flaring depth be 0.08DN~0.12DN.
The swirling number of the outer second air pipe is 0.6~1.2 in one of the embodiments, the outer second air pipe
Flaring angle β 2 is 25 °~55 °, flaring depth is 0.16DN~0.24DN, the top of pyrometric cone between the inside and outside secondary air channel
Angle γ is 15 °~25 °.
When the burner runs on flaming combustion mode in one of the embodiments, use air for oxidant, it is interior
The 80%~90% of the total volume of air supply of swirl secondary air amount Zhan, the 10%~20% of the total volume of air supply of contour stealth Secondary Air Zhan, axially penetrate
Flow point speed is less than 15m/s.
Multi-mode cyclone classification air distribution fuel oil low NOx combustion system includes boiler 100, combustion in one of the embodiments,
Burner 200, air blower 300, flue gas air mixing device 400, flue gas recirculation pipe 700 and shell circle become square joint 201, combustion
One end of burner is connect with boiler, and the other end of burner becomes square joint 201 by circle and connect with air blower, the flue gas air
Mixer is arranged in blower inlet, and the air intake of the flue gas air mixing device is equipped with the first electric control valve 500, cigarette
Gas recirculation pipe is equipped with the second electric control valve 600 and third electric control valve 800, first the 500, second electricity of electric control valve
Dynamic regulating valve 600 and third electric control valve 800 are used to adjust the mixed proportion and mixing temperature of flue gas and air.
When the burner runs on transition flame in one of the embodiments, use flue gas air mixture for oxygen
Agent, flue gas account for the 20%~60% of fuel-air combustion product gases amount, the total volume of air supply of inward eddy secondary air flow Zhan 70%~
The 20%~30% of the total volume of air supply of 80%, contour stealth Secondary Air Zhan, axial jet component velocity are less than 25m/s.It, should in the present embodiment
Device is first flaming combustion mode, when flaming combustion mode is converted to transition flame modes, the combustion of multi-mode cyclone classification air distribution
Oily low NOx combustion system closes the second electric control valve on flue gas recirculation pipe as shown in Figure 1, when burner starts, and closes
The aperture-type regulating valve of contour stealth, closes the first electric control valve of air intake, starts air blower, gradually performs fighting first electronic
Regulating valve uses air for oxidant, and central tube direct current speed is less than 15m/s, and initial igniter starts oil pump oil spout, burning
Device runs on flaming combustion mode, after the combustion is stabilized, increase fuel and air amount load up to target load (30%~
100% load), oxygen at furnace exit is maintained and is remained unchanged between 2%~5%, when furnace exit temperature is greater than 850 DEG C,
It opens and gradually opens big second motor-driven valve 600, opening the big increase of third electric control valve 800 high-temperature flue gas internal circulating load makes flue gas air
Mixing temperature is greater than 5 DEG C~10 DEG C of flue gas temperature of hearth outlet, and flue gas mixes with air object as oxidant at this time, works as mixture
Oxygen concentration less than 13%~16% when, the aperture for gradually opening big contour stealth adjusts door, and burner is converted into from flaming combustion
Transition flame modes.
When the burner runs on non flame combustion mode in one of the embodiments, furnace exit temperature is greater than 850
DEG C, use flue gas air mixture for oxidant, flue gas accounts for the 50%~120% of fuel-air combustion product gases amount, inward eddy two
The 20%~40% of the secondary total volume of air supply of air quantity Zhan, the 60%~80% of the total volume of air supply of contour stealth Secondary Air Zhan, axial jet point speed
Degree is less than 30m/s.In the present embodiment, which is first in transition flame modes, has served as crossing flame modes to flameless combustion mode
When conversion, multi-mode cyclone classification air distribution fuel oil low NOx combustion system is as shown in Figure 1, continue to increase the adjusting of contour stealth aperture-type
Valve increases the second electric control valve on flue gas recirculation pipe and flue gas third electric control valve and makes flue gas air to standard-sized sheet
Mixing temperature is greater than 80 DEG C, and burner is transformed into smouldering state from transition flame status.
Above-mentioned multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus can organize flaming combustion mode, transition flame
Three kinds of methods of operation such as state and flameless combustion mode.In boiler startup and underrun stage, which is woven with
Flame combustion mode uses air for oxidant, when furnace exit temperature be greater than 850 DEG C, use flue gas air mixture be aoxidize
Agent converts burner by transition flame from flaming combustion mode by the adjusting of oxidant constituents and inside and outside secondary air flow
To flameless combustion mode, so that oil burning boiler NOx emission concentration is reduced to 30mg/m3(O2=3.5%) within.
This hair can be understood and applied the above description of the embodiments is intended to facilitate those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to implementations here
Example, those skilled in the art's announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be
Within protection scope of the present invention.
Claims (8)
1. a kind of multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus, which includes central tube, inner second air pipe
With outer second air pipe, center arrangement oil burner nozzle in the central tube arranges igniting between the central tube and the oil burner nozzle
Device, the oil burner nozzle outlet is concordant with the exit end face of the central tube, arrangement inner swirler and text in the inner second air pipe
The outlet of jet pipe in mound, the central tube is concordant with the exit end face of inner second air pipe, and aperture is arranged in the outer second air pipe
Formula regulating valve and outer swirler.
2. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: described
The speed of oil burner nozzle surrounding direct current wind in central tube is 5m/s~15m/s.
3. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: described
The swirling number of inner second air pipe is 0.8~1.4, and the length L of the venturi nozzle is 0DN~1.05DN (Diameter
Nominal, nominal diameter, unit: mm), height H be 0DN~0.3DN, angle of throat α is 35 °~55 °, angle of flare β be 45 °~
75 °, the flaring angle β of the inner second air pipe1For 45 °~75 °, flaring depth be 0.08DN~0.12DN.
4. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: described
The swirling number of outer second air pipe is 0.6~1.2, the flaring angle β of the outer second air pipe2It is for 25 °~55 °, flaring depth
0.16DN~0.24DN, the apex angle γ of pyrometric cone is 15 °~25 ° between the inside and outside secondary air channel.
5. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to claim 1, which is characterized in that described
The fuel that burner uses is diesel oil or heavy oil or bio-fuel-oil.
6. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to any one of claims 1 to 5, feature exist
In: when the burner runs on flaming combustion mode, use air for oxidant, the total volume of air supply of inward eddy secondary air flow Zhan
The 10%~20% of the total volume of air supply of 80%~90%, contour stealth Secondary Air Zhan, axial jet component velocity are less than 15m/s.
7. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to any one of claims 1 to 5, feature exist
In: when the burner runs on transition flame, use flue gas air mixture for oxidant, flue gas accounts for fuel-air burning cigarette
The 20%~60% of tolerance, the 70%~80% of the total volume of air supply of inward eddy secondary air flow Zhan, the total volume of air supply of contour stealth Secondary Air Zhan
20%~30%, axial jet component velocity be less than 25m/s.
8. multi-mode cyclone classification air distribution fuel oil low NOx combustion apparatus according to any one of claims 1 to 5, feature exist
In: when the burner runs on non flame combustion mode, furnace exit temperature be greater than 850 DEG C, use flue gas air mixture for
Oxidant, flue gas account for the 50%~120% of fuel-air combustion product gases amount, the total volume of air supply of inward eddy secondary air flow Zhan 20%~
The 60%~80% of the total volume of air supply of 40%, contour stealth Secondary Air Zhan, axial jet component velocity are less than 30m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910087503.XA CN109737397A (en) | 2019-01-29 | 2019-01-29 | Multi-mode cyclone classification air distribution fuel oil low NOx combustion method and its device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910087503.XA CN109737397A (en) | 2019-01-29 | 2019-01-29 | Multi-mode cyclone classification air distribution fuel oil low NOx combustion method and its device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2129874Y (en) * | 1992-07-13 | 1993-04-14 | 王可杭 | Heavy oil burner |
| CN105782967A (en) * | 2014-12-25 | 2016-07-20 | 黑龙江宏宇电站设备有限公司 | Burning method of concentrated-thin type dual channel swirl burner of power station boiler |
| CN206145669U (en) * | 2016-09-28 | 2017-05-03 | 北京盛恒鑫业能源科技有限公司 | Swirling flow pulverized coal burner |
| CN207112818U (en) * | 2017-03-22 | 2018-03-16 | 黄玉河 | Multi fuel low-NOx combustor |
| CN108506929A (en) * | 2018-03-13 | 2018-09-07 | 同济大学 | A kind of fuel oil flameless combustion apparatus and its system equipment |
-
2019
- 2019-01-29 CN CN201910087503.XA patent/CN109737397A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2129874Y (en) * | 1992-07-13 | 1993-04-14 | 王可杭 | Heavy oil burner |
| CN105782967A (en) * | 2014-12-25 | 2016-07-20 | 黑龙江宏宇电站设备有限公司 | Burning method of concentrated-thin type dual channel swirl burner of power station boiler |
| CN206145669U (en) * | 2016-09-28 | 2017-05-03 | 北京盛恒鑫业能源科技有限公司 | Swirling flow pulverized coal burner |
| CN207112818U (en) * | 2017-03-22 | 2018-03-16 | 黄玉河 | Multi fuel low-NOx combustor |
| CN108506929A (en) * | 2018-03-13 | 2018-09-07 | 同济大学 | A kind of fuel oil flameless combustion apparatus and its system equipment |
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Application publication date: 20190510 |
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