CN103791495B - Oxygen-enriched low-NOx pulverized coal burner and application thereof - Google Patents

Oxygen-enriched low-NOx pulverized coal burner and application thereof Download PDF

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Publication number
CN103791495B
CN103791495B CN201410064479.5A CN201410064479A CN103791495B CN 103791495 B CN103791495 B CN 103791495B CN 201410064479 A CN201410064479 A CN 201410064479A CN 103791495 B CN103791495 B CN 103791495B
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nozzle
burner
oxygen
nox
wind
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CN103791495A (en
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颜碧兰
汪澜
齐砚勇
宋军华
张坤悦
朱文尚
王俊杰
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China Building Materials Academy CBMA
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China Building Materials Academy CBMA
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

A kind of oxygen-enriched low-NOx pulverized coal burner and application thereof, relate to the coal burner of a kind of cement kiln.It is characteristic of the invention that the shower nozzle at burner is equipped with pantographic nozzle.This burner utilizes pantographic nozzle that exogenous wind wind speed can be made to reach supersonic speed, and is oxygen rich gas by this burner.The air velocity of burner injection is the highest, N2And O2The shortest in the flame high-temperature region holdup time, the probability forming NOx also reduces;Relatively low primary air flow makes flame high-temperature region oxygen content reduce, its High-speed DC wind energy rapidly and evenly scattered pulverized coal is in thermal current, the most both can reduce the superelevation warm area of burner front end, and coal dust and the thermal current time of staying in flame high-temperature region can have been shortened again, thus reduce NOx generation amount.Controlled by oxygen-enriched combusting and Whirl deposite tank, the reduction flame zone of oxygen-enriched oxidizing flame district and fuel-rich can be formed, and then while ensureing heat force intensity, efficient burning, it is achieved that the reduction of discharging of NOx.

Description

Oxygen-enriched low-NOx pulverized coal burner and application thereof
Technical field
The invention belongs to technical field of combustion equipment, relate to a kind of low-NOx pulverized coal burner, particularly to one Plant and can reduce the coal burner of NOx discharge and the application in cement kiln thereof in manufacture of cement.
Background technology
Oxygen-enriched combusting is one of power-saving technology of burning in modern age.Oxygen-enriched combustion technology can reduce the burning-point of fuel, Accelerate burning velocity, promotion burning is complete, improve flame temperature, reduce the smoke discharge amount after burning, raising Heat utilization ratio and reduction excess air coefficient, have superior energy-conservation and environmental-protecting performance, be referred to as by developed country For " resource creativeness technology ".Research in recent years shows, oxygen-enriched combustion technology is currently mainly applied to industry In boiler and glass furnace, it is few that cement industry uses.
In the waste gas of cement predecomposition kiln discharge, NOx content exceedes the strictest discharging standards, mesh Before, cement industry mainly uses the SNCR technology reduction NOx spraying into ammonia or carbamide at decomposition furnace outlet, Realize qualified discharge, but relatively costly, cause manufacture of cement cost to increase.Cement kiln uses low nitrogen coal dust firing Device, it is achieved low NOx drainage is the important requirement of energy-saving and emission-reduction.Its basic structure of existing coal burner is Common four-way structure, including for the primary air piping group of supply and before be docked at this primary air piping group with screw thread The burner tip of end, burner tip is provided with multiple straight tube nozzle foremost;Its shortcoming is the injection of flame Thrust is not enough, and coal dust mixes abundant not with air, and there is flame peak temperature, therefore NOx discharge is relatively Greatly, the trend trend of energy-saving and emission-reduction is not met.
Summary of the invention
It is an object of the invention to adapt to the trend trend of energy-saving and emission-reduction, it is provided that a kind of oxygen-enriched low-NOx coal powder Device and special nozzle thereof, and further provide for this oxygen-enriched low-NOx pulverized coal burner application in manufacture of cement.
First, the present invention proposes the special nozzle of a kind of oxygen-enriched low-NOx pulverized coal burner, and described nozzle is contracting Formula of putting i.e. has the nozzle of two-part variable diameter design.
Described nozzle has through hole along axis, and the diameter dimension of through hole first gradually reduces from inside to outside and the most gradually expands Greatly.Preferably, the cone angle of tapered portion is 20 ± 5 °, and the cone angle of flaring part 32 is 10 ± 2 °.Nozzle Shape of cross section be regular hexagon.
The present invention further provides a kind of oxygen-enriched low-NOx pulverized coal burner, including four-way structure with screw thread pair The burner tip connect and primary air piping group, and be disposed coaxially on the oil pipe of innermost layer, burner tip before End installs multiple nozzles, and described nozzle is the special nozzle of said structure.
In described oxygen-enriched low-NOx pulverized coal burner, burner tip coaxial package outer nozzle from outside to inside, outer Axial flow wind jet pipe, coal wind jet pipe and inward eddy wind jet pipe, and the most sheathed with primary air piping group respectively Four circular passages pair of the respective outer tube with blast pipe, outer axial flow airduct, coal airduct and inward eddy airduct Position, inlays center aerofoil between inward eddy wind jet pipe and oil pipe, inlays between outer nozzle and outer axial flow wind jet pipe Embedding nozzle seat board, described nozzle is fixed on nozzle seat board.Circumference along burner tip can be provided with 14-20 Individual nozzle, nozzle is fixed on nozzle seat board with thread forms.
In described oxygen-enriched low-NOx pulverized coal burner, there is the elevation angle, the elevation angle in the outside end of coal wind jet pipe outer wall Angle be 5 °-10 °.
In described oxygen-enriched low-NOx pulverized coal burner, the outside end of inward eddy wind jet pipe is provided with and can produce The eddy flow groove of eddy flow, the eddy flow angle of eddy flow groove is 15 °-45 °.
Present invention further propose that the application in manufacture of cement of the described oxygen-enriched low-NOx pulverized coal burner, it is provided that A kind of low NOx drainage amount cement kiln, in this cement kiln, is provided with described oxygen-enriched low-NOx pulverized coal burner.
First air of the present invention uses oxygen concentration to be the oxygen-enriched air of 28%-60%, and primary air flow accounts for into rotary kiln The 6%-10% of air capacity.Realizing under excess oxygen, NOx discharge reduces.
Using above design, the oxygen-enriched low-NOx pulverized coal burner that the present invention provides, this burner uses scaling Formula nozzle, can make exogenous wind wind speed reach supersonic speed, and its High-speed DC wind energy rapidly and evenly scattered pulverized coal is to warm In air-flow, the most both can reduce the superelevation warm area of burner front end, coal dust and thermal current can be shortened again at flame The time of staying of high-temperature region, thus reduce NOx generation amount.The inside and outside wind velocity difference of this burner is relatively big, then Controlled by oxygen-enriched combusting and Whirl deposite tank, the reduction flame zone of oxygen-enriched oxidizing flame district and fuel-rich can be formed, And then while ensureing heat force intensity, efficient burning, it is achieved that the reduction of discharging of NOx.
Accompanying drawing explanation
Fig. 1: for the overall structure schematic diagram of oxygen-enriched low-NOx pulverized coal burner.
Fig. 2: for burner tip part-structure schematic diagram of the present invention.
Fig. 3: for the concrete structure schematic diagram of burner pantographic nozzle of the present invention.
Fig. 4: for the structural representation of burner coal wind nozzle-end of the present invention.
Fig. 5: for the structural representation of burner inward eddy wind nozzle-end eddy flow groove of the present invention.
Detailed description of the invention
The present invention is to adapt to the requirement of energy-saving and emission-reduction, well-designed a kind of oxygen-enriched low NOx for cement kiln Coal burner.
Design philosophy of the present invention is: low-NOx combustor, is to be divided by the air of burner internal or outlet jet Level, feature is to control fuel and the mixed process of air in every burner, makes retarded by combustion, extends flame row Journey, reduces flame temperature peak, thus reduces NOx generation amount.The air velocity of burner injection is the highest, N2 And O2The shortest in the flame high-temperature region holdup time, the probability forming NOx also reduces;Relatively low primary air flow Flame high-temperature region oxygen content is made to reduce, in its High-speed DC wind energy rapidly and evenly scattered pulverized coal to thermal current, this Sample both can reduce the superelevation warm area of burner front end, can shorten again coal dust and thermal current stopping in flame high-temperature region Stay the time, thus reduce NOx generation amount.Therefore, manage to make the interior exogenous wind from burner tip ejection be formed Bigger speed difference, then controlled by oxygen-enriched combusting and Whirl deposite tank, can form oxygen-enriched oxidizing flame district and fuel-rich The reduction flame zone of material, and then while ensureing heat force intensity, efficient burning, it is achieved that the reduction of discharging of NOx.
The present invention proposes a kind of oxygen-enriched low-NOx pulverized coal burner based on above design philosophy, and it includes coaxial cloth Oil pipe, burner tip and the primary air piping group put, oil pipe is positioned at the innermost layer of burner, burner tip with Use threaded between primary air piping group.Burner tip include from outside to inside outer nozzle, outer axial flow wind spray, Coal wind jet pipe and inward eddy wind jet pipe.Above-mentioned shower nozzle also includes center aerofoil, nozzle seat board and nozzle, Qi Zhongzhong Heart-wind syndrome plate is embedded between inward eddy wind jet pipe and oil pipe, uses with inward eddy wind jet pipe and threadeds;Nozzle carrier Plate is embedded between outer nozzle and outer axial flow wind jet pipe;Nozzle is fixed on nozzle seat board, and connected mode is screw thread Connect.Primary air piping group includes outer tube, outer axial flow airduct, coal airduct and inward eddy airduct within outer.Above-mentioned Primary air piping group also includes outer axial flow wind blast pipe, coal wind blast pipe, inward eddy wind blast pipe and centre wind air intake Pipe, outer axial flow wind blast pipe is positioned on outer tube;Coal wind blast pipe is positioned on outer axial flow airduct;Inward eddy wind Blast pipe is positioned on coal airduct;Centre wind blast pipe is positioned on inward eddy airduct.
Burner tip be circumferentially with 14-20 nozzle, described nozzle is pantographic nozzle, described nozzle Shape of cross section is regular hexagon, and nozzle has through hole along axis, and the diameter dimension of described through hole first contracts gradually Little the most gradually expanding, the cone angle of tapered portion is 20 ± 5 °, and the cone angle of flaring part is 10 ± 2 °, reaches The effect of lift gas speed.Described nozzle uses with described burner tip threadeds.The end of coal wind jet pipe There is the elevation angle in portion, angle is 5 °-10 °.There is the eddy flow that can produce eddy flow in the end of inward eddy wind jet pipe Groove, the eddy flow angle of eddy flow groove is 15 °-45 °.
Describe in detail below in conjunction with the accompanying drawings.
As it is shown in figure 1, the present invention is a kind of oxygen-enriched low-NOx pulverized coal burner, including the burner spray of docking 100 and primary air piping group 200, and the oil pipe 16 coaxially arranged with primary air piping group and burner tip, Oil pipe 16 is positioned at the innermost layer of burner, uses and threaded between burner tip with primary air piping group.
Primary air piping group 200 has four circular passages, from outside to inside outer tube 8, outer axial flow airduct 10, coal airduct 12 and inward eddy airduct 14 coaxial package be successively set on these four circular passages;Above-mentioned primary air piping group 200 Also include outer axial flow wind blast pipe 9, coal wind blast pipe 11, inward eddy wind blast pipe 13 and centre wind blast pipe 15, outer axial flow wind blast pipe 9 is positioned on outer tube 8, and coal wind blast pipe 11 is positioned on outer axial flow airduct 10, Inward eddy wind blast pipe 13 is positioned on coal airduct 12, and centre wind blast pipe 15 is positioned on inward eddy airduct 14.
As in figure 2 it is shown, burner tip 100 coaxial package outer nozzle 4 from outside to inside, outer axial flow wind jet pipe 5, Coal wind jet pipe 6 and inward eddy wind jet pipe 7, and respectively with four circular passage para-positions of primary air piping group.Above-mentioned Shower nozzle also includes center aerofoil 1, nozzle seat board 2 and nozzle 3, and wherein center aerofoil 1 is embedded in inward eddy wind Between jet pipe 7 and oil pipe 16, use with inward eddy wind jet pipe 7 and threaded;Outside nozzle seat board 2 is embedded in Between jet pipe 4 and outer axial flow wind jet pipe 5;Nozzle 3 is fixed on nozzle seat board 2, and connected mode is that screw thread connects Connect.
Burner tip 100 be circumferentially with 14-20 nozzle 3, described nozzle 3 is pantographic nozzle, ginseng As shown in Figure 3, the shape of cross section of nozzle 3 is regular hexagon, and nozzle 3 has through hole along axis, described The diameter dimension of through hole first gradually reduces (for from right to left in Fig. 3) from inside to outside and the most gradually expands, tapered portion The cone angle dividing 31 is 20 ± 5 °, and the cone angle of flaring part 32 is 10 ± 2 °, by two-part variable diameter design Reach the effect of lift gas speed.
Shown in Figure 4, there is the elevation angle in the end of coal wind jet pipe 6 outer wall outwards (in Fig. 4, left side is outer), Angle is 5 °-10 °.Shown in Figure 5, outside (in Fig. 5, left side is outer) of inward eddy wind jet pipe 7 End be provided with the eddy flow groove 71 that can produce eddy flow, the eddy flow angle of eddy flow groove 71 is 15 °-45 °.
The work process of burner of the present invention is as follows: oxygen-enriched First air respectively by outer tube 8, outer axial flow airduct 10, Coal airduct 12 and inward eddy airduct 14 with different wind speed and different flows enter primary air piping group 200(by The gas that outer axial flow airduct 10 enters burner carries coal dust), then entered shower nozzle by primary air piping group 200 In 100.The oxygen-enriched First air of burner outer tube 8 is entered through 14-20 contracting by outer axial flow wind blast pipe 9 Put speed when formula nozzle 3 sprays burner to raise, reach supersonic speed, form outer axial flow wind;By coal wind air intake Pipe 11 enters the oxygen-enriched First air carrying coal dust of burner, through outer axial flow wind jet pipe 5 inwall and coal wind The when of jet pipe 6 outer wall passage ejection burner, owing to coal wind jet pipe 6 outer wall head has 5 ° of-10 ° of elevations angle When First air can be made to spray, coal dust is kicked up;By inward eddy wind blast pipe 13 enter burner oxygen-enriched once Wind, through the passage spray that coal wind jet pipe 6 inwall and end are formed with spiral fluted inward eddy wind jet pipe 7 outer wall The when of going out burner, eddy flow can be produced, form Whirl deposite tank;Burner is entered by centre wind blast pipe 15 Oxygen-enriched First air, through center aerofoil 1 spray burner formed centre wind.After spraying due to outer axial flow wind Speed is very big, will form bigger speed difference with inward eddy wind.The air velocity of burner injection is the highest, and one The N carried in secondary wind2And O2The shortest in the flame high-temperature region holdup time, the probability forming NOx also reduces; From the High-speed DC wind energy rapidly and evenly scattered pulverized coal of pantographic nozzle 3 ejection to thermal current, the most both may be used To reduce the superelevation warm area of burner front end, coal dust and thermal current can be shortened again when the stop of flame high-temperature region Between, thus reduce NOx generation amount;Controlled by oxygen-enriched combusting and Whirl deposite tank again, oxygen-enriched oxidation can be formed The reduction flame zone of flame zone and fuel-rich, and then while ensureing heat force intensity, efficient burning, it is achieved that The reduction of discharging of NOx.Utilize these features, cement kiln is installed oxygen-enriched low-NOx pulverized coal burner, will significantly Reduce the discharge capacity of NOx in manufacture of cement.
Emission reduction effect: oxygen-enriched low-NOx pulverized coal burner is as follows in certain 1000t/d nsp kiln applicable cases: raw Material feeding capacity 60t/h, coal As-received caloric value 5840kcal/kg, kiln hood feeds coal amount 2.4t/h, Coaling of Decomposing Furnace 3.1t/h.Rotary kiln rotating speed 3.9rpm, tertiary air temperature 950 DEG C, kiln tail smoke-box temperature 1000 DEG C, grog к н=0.90, SM=2.8, IM=1.7.Being passed through oxygen concentration in the clean wind of oxygen-enriched low-NOx pulverized coal burner is 30% Oxygen-enriched air, coal wind wind speed 16m/s, outer axial flow wind wind speed 300m/s, inward eddy wind wind speed 95m/s, raw Material feeding capacity brings up to 73t/h from 60t/h, and kiln tail smoke-box NOx content is from 481ppm/m3It is down to 350ppm/m3, Reducing by 30%, effect is notable.
Above description is visible, it is characteristic of the invention that the shower nozzle at burner is equipped with pantographic nozzle.This burner Utilize pantographic nozzle that exogenous wind wind speed can be made to reach supersonic speed, and be oxygen rich gas by this burner.Combustion The air velocity of burner injection is the highest, N2And O2The shortest in the flame high-temperature region holdup time, form the machine of NOx Rate also reduces;Relatively low primary air flow makes flame high-temperature region oxygen content reduce, and its High-speed DC wind energy is the most uniform Ground scattered pulverized coal, in thermal current, the most both can reduce the superelevation warm area of burner front end, can shorten again coal dust With thermal current in the time of staying of flame high-temperature region, thus reduce NOx generation amount.By oxygen-enriched combusting and eddy flow Wind controls, and can form the reduction flame zone of oxygen-enriched oxidizing flame district and fuel-rich, so ensure heat force intensity, While efficient burning, it is achieved that the reduction of discharging of NOx.

Claims (6)

1. an oxygen-enriched low-NOx pulverized coal burner, the burner tip docked with screw thread including four-way structure and one Secondary airduct group, and it is disposed coaxially on the oil pipe of innermost layer, burner tip installs multiple nozzle foremost, its feature Being: described nozzle is the nozzle that pantographic i.e. has two-part variable diameter design, described nozzle has through hole along axis, The diameter dimension of through hole first gradually reduces from inside to outside and the most gradually expands, and the cone angle of tapered portion is 20 ± 5 °, flaring portion The cone angle divided is 10 ± 2 °;
Burner tip coaxial package outer nozzle from outside to inside, outer axial flow wind jet pipe, coal wind jet pipe and inward eddy wind jet pipe, And the respective outer tube with blast pipe the most sheathed with primary air piping group, outer axial flow airduct, coal wind respectively Pipe and four circular passage para-positions of inward eddy airduct, inlay center aerofoil between inward eddy wind jet pipe and oil pipe, Inlaying nozzle seat board between outer nozzle and outer axial flow wind jet pipe, described nozzle is fixed on nozzle seat board, the axis of nozzle Line is parallel with the axis of described outer tube;
The outside end of inward eddy wind jet pipe is provided with the eddy flow groove that can produce eddy flow, and the eddy flow angle of eddy flow groove is 15°-45°。
The most oxygen-enriched low-NOx pulverized coal burner, it is characterised in that: described nozzle transversal Face is shaped as regular hexagon.
Oxygen-enriched low-NOx pulverized coal burner the most according to claim 1 or claim 2, it is characterised in that: spray along burner Head be circumferentially with 14-20 nozzle, nozzle is fixed on nozzle seat board with thread forms.
Oxygen-enriched low-NOx pulverized coal burner the most according to claim 1 or claim 2, it is characterised in that: outside coal wind jet pipe There is the elevation angle in the outside end of wall, the angle at the elevation angle is 5 °-10 °.
The most oxygen-enriched low-NOx pulverized coal burner, it is characterised in that: coal wind jet pipe outer wall to There is the elevation angle in outer end, the angle at the elevation angle is 5 °-10 °.
6. a low NOx drainage amount cement kiln, it is characterised in that be provided with the arbitrary described richness of claim 1 to 5 Oxygen low-NOx pulverized coal burner.
CN201410064479.5A 2014-02-25 2014-02-25 Oxygen-enriched low-NOx pulverized coal burner and application thereof Active CN103791495B (en)

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CN104033896A (en) * 2014-06-28 2014-09-10 广西聚为能源科技有限公司 Oxygen-enriched combustion device of boiler
CN104033895A (en) * 2014-06-28 2014-09-10 广西聚为能源科技有限公司 Oxygen-enriched pulverized coal combustor
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Inventor before: Song Junhua

Inventor before: Zhang Kunyue

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