CN109631033A - A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device - Google Patents
A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device Download PDFInfo
- Publication number
- CN109631033A CN109631033A CN201811532179.XA CN201811532179A CN109631033A CN 109631033 A CN109631033 A CN 109631033A CN 201811532179 A CN201811532179 A CN 201811532179A CN 109631033 A CN109631033 A CN 109631033A
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- CN
- China
- Prior art keywords
- flue gas
- central tube
- depth
- gas recirculation
- low nox
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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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/40—Mixing tubes or chambers; Burner heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of depth flue gas recirculation fuel oil low NOx combustion method and its device, which is made of outer cylinder, cyclone, venturi nozzle and central tube, the making material surface plating fluorine of cyclone and central tube or spray fluorine processing.Use the mixture of outer circulation flue gas and air for oxidant, outer circulation flue gas multiplying power (ratio with air burning exhaust gas volumn) is 25%~80%, and flue gas air mixture temperature is greater than 5 DEG C~10 DEG C of exhaust gas temperature, the flaring angle β of outer cylinder2For 45 °~75 °, flaring depth be 0.08DN~0.12DN (Diameter Nominal, outer cylinder nominal diameter, unit: mm), the swirl strength of cyclone is 0.6~1.8, eddy flow axial direction component velocity is 10m/s~35m/s, and the length L of venturi nozzle is 0DN~1.05DN, height H is 0DN~0.3DN, angle of throat α is 35 °~55 °, angle of flare β1It is 45 °~75 °, oil burner nozzle and igniter is arranged in central tube, the speed of oil burner nozzle surrounding direct current wind is 5m/s~15m/s in central tube.
Description
Technical field
The invention belongs to Thermal Power Engineering field of combustion technology, are related to a kind of depth flue gas recirculation fuel oil low NOx combustion method
And its device.
Background technique
Currently, fuel burning is reduced using the flaming combustion mode of the methods of air classification, fuel staging, flue gas recirculation
The best level of NOx emission concentration is less than 120mg/Nm3(O2=3.5%).
This seminar is in the case where the Shanghai Municipal Commission of Science and Technology subsidizes, and by nearly 8 years study for a long period of time, issues depth flue gas by experiment opening
Fuel oil low-NOx combustor is recycled, NOx emission concentration is less than 50mg/m3(O2=3.5%).
Summary of the invention
Depth flue gas recirculation fuel oil low NOx combustion method and its device of the present invention use the outer circulation of high magnification flue gas, simultaneously
Eddy flow combines circulation in the jet strengthened burner hearth flue gas of venturi nozzle, i.e., with the side of flue gas deep-cycle inside and outside oil burning boiler
Method, the transition flame status that oil burner work is converted in flaming combustion to flameless combustion, to make oil burning boiler NOx emission
Concentration is reduced to 50mg/m3(O3=3.5%) within.
To achieve the goals above, the technical solution adopted by the present invention specifically includes that
Depth flue gas recirculation fuel oil low NOx combustion apparatus use outer circulation multiplying power for 25%~80% flue gas and air
Mixture promotes burner hearth flue gas is strongly interior to follow as oxidant, using the compound jet that axial swirler and venturi nozzle generate
The inside and outside flue gas recirculation of ring, i.e. boiler is all deepened, and converts so that fuel burning be made to enter flaming combustion to flameless combustion
Transition flame status.
The present invention provides a kind of depth flue gas recirculation fuel oil low NOx combustion apparatus, specifically include that
The burner includes outer cylinder, cyclone, venturi nozzle and central tube, the system of the cyclone and central tube
Make material surface plating fluorine or spray fluorine processing, cyclone and venturi nozzle are set between the outer cylinder and the central tube, it is described
Venturi nozzle exit is provided with flaring, setting oil burner nozzle and igniter in the central tube, the outlet of the oil burner nozzle and
Central tube exit end face is concordant.
The flaring angle β of the outer cylinder2For 45 °~75 °, flaring depth be 0.08DN~0.12DN (Diameter
Nominal, outer cylinder nominal diameter, unit: mm).
The burner uses the mixture of outer circulation flue gas and air for oxidant, and outer circulation flue gas multiplying power is 28%
~80%, the temperature of flue gas air mixture is greater than 5 DEG C~10 DEG C of exhaust gas temperature.
The cyclone uses axial swirler, and the swirl strength of the axial swirler is that 0.6~1.8, eddy flow is axial
Component velocity is 10m/s~35m/s.
The length L of the venturi nozzle of the burner is 0DN~1.05DN, and height H is 0DN~0.3DN, angle of throat
α is 35 °~55 °, angle of flare β1It is 45 °~75 °.
The speed of oil burner nozzle surrounding direct current wind is 5m/s~15m/s in the central tube of the burner.
The fuel that the burner uses is diesel oil or heavy oil or bio-fuel-oil.
Above structure parameter and the operating parameter combination of the burner can make oil burner work in flaming combustion
The transition flame status converted to flameless combustion, so that oil burning boiler NOx emission concentration be made to be reduced to 50mg/m3(O3=3.5%)
Within.
Detailed description of the invention
Fig. 1 is depth flue gas recirculation fuel oil low NOx combustion system schematic diagram；
Fig. 2 is depth flue gas recirculation fuel oil low-NOx combustor axonometric drawing；
Fig. 3 is the cross-sectional view of the structure of depth flue gas recirculation fuel oil low-NOx combustor when venturi nozzle height is not zero
The cross-sectional view of the structure for the depth flue gas recirculation fuel oil low-NOx combustor that Fig. 4 is venturi nozzle height when being zero
100- smoke pipe；200- electric control valve 1；300- boiler body；400- burner；500- air blower；600- mixes gas
Device；700- electric control valve；800- electric control valve；401- outer cylinder；402- central tube；403- cyclone；404- flaring；
405- burner hearth；406- venturi nozzle
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
Embodiment 1
Embodiment 1 is as shown in figure 3, be what depth flue gas recirculation fuel oil low-NOx combustor carried out on 4t/h oil burning boiler
100% load test.
Combustion system closes flue gas recirculation as shown in Figure 1, when burner starts, and starts air blower, the oxidation of burner
Agent is air, and central tube direct current speed is less than 10m/s, and initial igniter starts oil pump oil spout, and burner runs on flaming combustion
Mode after flameholding, increases fuel and air amount load up to 100% load, oxygen at furnace exit maintains 2%~5%
Between remain unchanged, when furnace exit temperature is greater than 850 DEG C, opens and simultaneously gradually open big flue gas motorized recycling valve, cigarette at this time
Gas mixes with air object as oxidant, when the oxygen concentration of mixture is less than 13%~16%, burner operation Yu Youyan
The transition flame modes burnt to flameless combustion conversion.
It is diesel oil, fuel consumption that the structural parameters and operating parameter of the transition flame modes of burner, which are respectively as follows: fuel,
248kg/h, flue gas outer circulation amount 1508m3/ h, 63 DEG C of exhaust gas temperature, the swirling number of axial swirler is 0.8, venturi
The length L of jet pipe is 190mm, and height H is 45mm, angle of throat α is 45 °, angle of flare β1It is 60 °, boiler export oxygen amount is 4%
(volume ratio), NOx emission concentration are 31mg/m3(O2=3.5%).
Embodiment 2
Embodiment 2 is as shown in figure 4, be what depth flue gas recirculation fuel oil low-NOx combustor carried out on 4t/h oil burning boiler
60% load test.
Combustion system closes flue gas recirculation as shown in Figure 1, when burner starts, and starts air blower, the oxidation of burner
Agent is air, and central tube direct current speed is less than 10m/s, and initial igniter starts oil pump oil spout, and burner runs on flaming combustion
Mode after flameholding, increases fuel and air amount load up to 60% load, oxygen at furnace exit maintain 2%~5% it
Between remain unchanged, when furnace exit temperature is greater than 850 DEG C, opens and simultaneously gradually open big flue gas motorized recycling valve, flue gas at this time
Object is mixed with air as oxidant, when the oxygen concentration of mixture is less than 13%~16%, burner operation is in there is flame combustion
Burn the transition flame modes converted to flameless combustion.
It is diesel oil, fuel consumption that the structural parameters and operating parameter of the transition flame modes of burner, which are respectively as follows: fuel,
148kg/h, flue gas outer circulation amount 901m3/ h, 40 DEG C of exhaust gas temperature, the swirling number of axial swirler is 1.6, no venturi
The length L of nozzle position is 190mm, and height H is 0, and boiler export oxygen amount is 6% (volume ratio), and NOx emission concentration is 41mg/
m3(O2=3.5%).
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 depth flue gas recirculation fuel oil low NOx combustion apparatus, the burner include outer cylinder, cyclone, venturi nozzle
And eddy flow is arranged in central tube, the making material surface plating fluorine or spray fluorine processing of cyclone and central tube between outer cylinder and central tube
Device and venturi nozzle, venturi nozzle exit are provided with flaring, oil burner nozzle and igniter are arranged in central tube, oil burner nozzle
It exports concordant with central tube exit end face.
2. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: the outer cylinder
Flaring angle β2It is 45 °~75 °, the flaring depth is that (Diameter Nominal, outer cylinder nominal are straight by 0.08DN~0.12DN
Diameter, unit: mm).
3. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: the burning dress
It sets and uses the mixture of outer circulation flue gas and air for oxidant, outer circulation flue gas multiplying power (ratio with air burning exhaust gas volumn)
It is 25%~80%, the temperature of flue gas air mixture is 5 DEG C~10 DEG C higher than the temperature of boiler exhaust gas.
4. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, it is characterised in that: the cyclone
Using axial swirler, the swirl strength of the axial swirler is 0.6~1.8, the axial component velocity of eddy flow be 10m/s~
35m/s。
5. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, which is characterized in that the venturi
The length L of jet pipe is 0DN~1.05DN, height H is 0DN~0.3DN, angle of throat α is 35 °~55 °, angle of flare β1For 45 °~
75°。
6. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, which is characterized in that the central tube
The speed of interior oil burner nozzle surrounding direct current wind is 5m/s~15m/s.
7. depth flue gas recirculation fuel oil low NOx combustion apparatus according to claim 1, which is characterized in that the burner
The fuel used is diesel oil or heavy oil or bio-fuel-oil.
8. depth flue gas recirculation fuel oil low NOx combustion apparatus according to any one of claims 1 to 7, which is characterized in that described
Above structure parameter and the operating parameter combination of burner (burner) can make oil burner work in flaming combustion to nothing
The transition flame status of flame burning conversion, so that oil burning boiler NOx emission concentration be made to be reduced to 50mg/m3(O3=3.5%) with
It is interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811532179.XA CN109631033A (en) | 2018-12-14 | 2018-12-14 | A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811532179.XA CN109631033A (en) | 2018-12-14 | 2018-12-14 | A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device |
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| Publication Number | Publication Date |
|---|---|
| CN109631033A true CN109631033A (en) | 2019-04-16 |
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ID=66074046
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811532179.XA Pending CN109631033A (en) | 2018-12-14 | 2018-12-14 | A kind of depth flue gas recirculation fuel oil low NOx combustion method and its device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110345475A (en) * | 2019-07-23 | 2019-10-18 | 华中科技大学 | A kind of premixed anti-backfire Flameless burner |
| CN112361331A (en) * | 2019-10-11 | 2021-02-12 | 中国石油大学(华东) | Plateau type fuel oil burner with high injection smoke and design method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2129874Y (en) * | 1992-07-13 | 1993-04-14 | 王可杭 | Heavy oil burner |
| CN205535787U (en) * | 2016-01-19 | 2016-08-31 | 南京创能电力科技开发有限公司 | Steam injection boiler crude oil whirl low NOx burner |
| CN108506929A (en) * | 2018-03-13 | 2018-09-07 | 同济大学 | A kind of fuel oil flameless combustion apparatus and its system equipment |
| CN208154482U (en) * | 2018-05-04 | 2018-11-27 | 江苏凤谷节能科技有限公司 | A kind of big momentum combustion combustor of multi-stage, energy-saving |
| CN208186334U (en) * | 2018-03-13 | 2018-12-04 | 同济大学 | A kind of single flow fuel oil flameless burner |
-
2018
- 2018-12-14 CN CN201811532179.XA patent/CN109631033A/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 |
| CN205535787U (en) * | 2016-01-19 | 2016-08-31 | 南京创能电力科技开发有限公司 | Steam injection boiler crude oil whirl low NOx burner |
| CN108506929A (en) * | 2018-03-13 | 2018-09-07 | 同济大学 | A kind of fuel oil flameless combustion apparatus and its system equipment |
| CN208186334U (en) * | 2018-03-13 | 2018-12-04 | 同济大学 | A kind of single flow fuel oil flameless burner |
| CN208154482U (en) * | 2018-05-04 | 2018-11-27 | 江苏凤谷节能科技有限公司 | A kind of big momentum combustion combustor of multi-stage, energy-saving |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110345475A (en) * | 2019-07-23 | 2019-10-18 | 华中科技大学 | A kind of premixed anti-backfire Flameless burner |
| CN110345475B (en) * | 2019-07-23 | 2020-05-19 | 华中科技大学 | Premixing type anti-backfire flameless combustor |
| CN112361331A (en) * | 2019-10-11 | 2021-02-12 | 中国石油大学(华东) | Plateau type fuel oil burner with high injection smoke and design method |
| CN112361331B (en) * | 2019-10-11 | 2022-04-29 | 中国石油大学(华东) | Plateau type fuel oil burner with high injection smoke and design method |
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| PB01 | Publication | ||
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Application publication date: 20190416 |