CN103267286B - A kind of gas combustion apparatus of ultra-low NOx emission and gas collocation method - Google Patents
A kind of gas combustion apparatus of ultra-low NOx emission and gas collocation method Download PDFInfo
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- CN103267286B CN103267286B CN201310183718.4A CN201310183718A CN103267286B CN 103267286 B CN103267286 B CN 103267286B CN 201310183718 A CN201310183718 A CN 201310183718A CN 103267286 B CN103267286 B CN 103267286B
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Abstract
The present invention relates to gas combustion apparatus and the gas collocation method of ultra-low NOx emission, solve and make NOx discharge be less than 20ppm, the technical problem that the low emission meeting high-power burner requires, belong to Industrial Boiler Technology field.It is characterized in that: central tube, cyclone, interior aditus laryngis and outer aditus laryngis are arranged from the central axis of burner is outwards coaxial successively, it is the first combustion air passage between interior aditus laryngis and outer aditus laryngis, be in the second combustion air between outside the inboard and central tube of interior aditus laryngis, be equipped with multiple T-shaped gas gun and multiple angle gas gun, and described multiple T-shaped gas gun and multiple interlaced interval of angle gas gun is isometrical is uniformly distributed.Beneficial effect is: the fuel gas hole of angle gas gun outwardly, forms flame, thus make use of boiler furnace space to greatest extent in the outside first combustion air passage of T-shaped rifle flame, thus make the NOx amount of generation few, be less than 20ppm, and produce without CO, flameholding is reliable.Single-machine capacity is maximum reaches more than 70MW.
Description
Technical field
The present invention relates to a kind of gas combustion apparatus and gas collocation method, particularly relate to gas combustion apparatus and gas collocation method that a kind of NOx discharge is less than the ultra-low NOx emission of 20ppm, belong to Industrial Boiler Technology field.
Background technology
Along with national energy-saving reduces discharging going deep into of policy, GB 100ppm is not content with to NOx emission in each big city, just required that NOx emission was less than 50ppm in cities such as Beijing as far back as 2008, subsequently Tianjin, Urumchi and some propose the low emission requirement of high-power burner all one after another with gas heating company, and the many requirements of combustion gas starting trouble of power plant are emitted on below 40ppm.But so far on international market, NOx emission is less than to the advanced burner requirement of 50ppm, also adopts flue gas recirculation measure to obtain more, extract a part by boiler smoke and to mix with fresh air and send into burner afterwards and combustion gas mixing is burnt.Its mechanism mainly reduces the oxygen concentration in air, reduces the probability that the N in air is combined with oxygen.But this method certainly will need to increase blower power and power consumption, robs Peter to pay Paul just, and this method too increases the unstability of burning, easily causes and breathes heavily shake, there is very big potential safety hazard simultaneously.Shanghai Nuote Feibo Combustion Equipment Co., Ltd's name is called
"backflow homogeneous combustion low-NOx combustor and gas collocation method thereof in a kind of flue gas
"the patent No. is the patent of invention of 201010582069.1, adopts T-shaped time spraygun portion pre-mixing gas combustion and air, makes fuel gas buring even, NOx emission is less than 40ppm, but for powerful gas combustion apparatus, lower discharge standard can be reached, need further research.
Summary of the invention
The object of the invention is: the gas combustion apparatus providing a kind of NOx discharge to be less than the ultra-low NOx emission of 20ppm and gas collocation method, Industrial Boiler Flame is made as far as possible effectively to utilize furnace cavity, reduce flame mean temperature and peak temperature, meet the instructions for use of ultra-low NOx emission.
For achieving the above object, the technical scheme taked is: a kind of gas combustion apparatus of ultra-low NOx emission, comprise central tube, cyclone and aditus laryngis, it is characterized in that: described central tube, described cyclone, interior aditus laryngis and outer aditus laryngis are arranged from the central axis of burner is outwards coaxial successively, end, described central tube upper end lateral surface is fixedly connected with the inner ring surface of described cyclone: described central tube is built-in with center combustion air passage, the first combustion air passage is equipped with between described interior aditus laryngis and outer aditus laryngis, the second combustion air passage is equipped with between outside the inboard and described central tube of described interior aditus laryngis, in described second combustion air passage, be equipped with multiple T-shaped gas gun and multiple angle gas gun, and described multiple T-shaped gas gun and multiple interlaced interval of angle gas gun is isometrical is uniformly distributed.
Described T-shaped gas gun is equipped with multiple (6 ~ 16) fuel gas hole, be respectively that spray orifice is returned in outer section of combustion gas, spray orifice, body of a gun fuel gas hole and end face fuel gas hole are returned in inner section of combustion gas: described outer section of combustion gas is returned spray orifice and be placed in the outer section of body of a gun horizontal component, described inner section of combustion gas is returned spray orifice and is placed in section in body of a gun horizontal component, described body of a gun fuel gas hole is placed in body of a gun vertical component, and described end face fuel gas hole is placed in the centripetal end end face of body of a gun horizontal component.
Described angle gas gun end face towards from inside to outside, and is equipped with multiple angle fuel gas hole.
The gas collocation method of the gas combustion apparatus of described ultra-low NOx emission, is characterized in that:
(1) low speed center combustion air is by described center combustion air channel axis to outflow, and described center combustion air accounts for 5 ~ 15% of total air, plays the effect of cooling root flame and reduction flame of centre temperature;
(2) combustion gas that angle gas gun end face angle fuel gas hole ejects in described first combustion air passage, and flows through the first combustion air channel axis to the combustion air mixed combustion of flowing out, and combustion gas can be burnt in the space that whole burner hearth is large as far as possible;
(3), in described second combustion air passage, combustion air is divided into two large divisions's axial flow, and a part flows through swirler blades and becomes Whirl deposite tank, and Whirl deposite tank combustion air accounts for 30% ~ 45% of total air; Another part combustion air, then from axial flow between cyclone outer shroud and interior aditus laryngis, becomes axial flow wind; The combustion gas that spray orifice ejection is returned in the described inner section of combustion gas that T-shaped gas gun is equipped with liquidates with the Whirl deposite tank flowed out through cyclone; The combustion gas of spray orifice ejection is returned in outer section of combustion gas and axial flow wind liquidates; Described body of a gun fuel gas hole liquidates with the combustion gas of described end face fuel gas hole radial direction ejection is vertical with described axial combustion air.
The invention has the beneficial effects as follows: due to T-shaped rifle combustion gas and air pre-mixing, reasonably make combustion gas and combustion air burn at furnace cavity Homogeneous phase mixing, avoid the generation of localized hyperthermia; And the fuel gas hole of angle gas gun outwardly, flame is formed in the outside of T-shaped rifle flame, thus make use of boiler furnace space to greatest extent, make the thermic load of various piece in burner hearth even, reduce flame mean temperature and peak temperature, thus make the NOx amount of generation few, be less than 20ppm, and produce without CO.Flameholding is reliable.Single-machine capacity is maximum reaches more than 70MW.
Accompanying drawing explanation
Below with reference to the accompanying drawings illustrate and detailed description of the invention the invention will be further described.
Fig. 1 is structural representation of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to structural representation;
Fig. 3 is hydrocyclone structure schematic diagram in Fig. 1;
Fig. 4 is T-shaped gas gun header structure schematic diagram;
Fig. 5 is that the B of Fig. 4 is to structural representation;
Fig. 6 is that the C of Fig. 4 is to structural representation;
Fig. 7 angle gas gun schematic diagram;
Fig. 8 is that the D of Fig. 7 is to structural representation;
Fig. 9 is that furnace flame arranges schematic diagram.
In figure, aditus laryngis 1.; 2.T type gas gun; 3. cyclone; 4. central tube; 5. angle gas gun; 6. outer aditus laryngis; 7. furnace wall; 8. spray orifice is returned in an outer section combustion gas; 9. spray orifice is returned in a li section combustion gas; 10. swirler blades; 11. cyclone outer shrouds; 12. cyclone inner ring; 13. combustion chambers; 14. angle rifle fuel gas holes; 15. angle gas gun end faces; 16. body of a gun fuel gas holes; 17 end face fuel gas holes; 18. center combustion air passages; 19. second combustion air passages; 20. first combustion air passages; 21. angle rifle flame zones; 22.T type rifle flame zone.
Detailed description of the invention
Fig. 1 and Fig. 2 is the gas combustion apparatus structural representation of a kind of ultra-low NOx emission of the present invention.Fig. 9 be the present invention when using furnace flame arrange schematic diagram.
Visible as shown in Figure 1, 2, described gas combustion apparatus structure comprises central tube 4, cyclone 3 and aditus laryngis, it is characterized in that: outwards coaxially arrange described central tube 4, described cyclone 3, interior aditus laryngis 1 and outer aditus laryngis 6 successively from the central axis of burner; Described central tube 4 upper end is fixedly connected with described cyclone inner ring 12 outside end; Multiple T-shaped gas gun 2 and multiple angle gas gun 5 is equipped with between described cyclone outer shroud 11 and described interior aditus laryngis 1, and described multiple T-shaped gas gun 2 and multiple interlaced interval of angle gas gun 5 is isometrical is uniformly distributed.
Fig. 3 is hydrocyclone structure schematic diagram, visible as shown in Figure 3, and cyclone 3 is made up of cyclone outer shroud 11, cyclone inner ring 12 and the some swirler blades 10 be placed in therebetween thereof, and described swirler blades 10 is streamlined in curved shape of plunderring, and is evenly periphery.Made by exotic material, make air by time crushing little, flow pattern good, be easy to and combustion gas Homogeneous phase mixing.
T-shaped gas gun structural representation is illustrated in Fig. 4 ~ Fig. 6.Illustrate described T-shaped gas gun 2 and be equipped with multiple (6 ~ 16) fuel gas hole, be respectively that spray orifice 8 is returned in outer section of combustion gas, spray orifice 9, body of a gun fuel gas hole 16 and end face fuel gas hole 17 are returned in inner section of combustion gas, combustion gas is flowed out from these little fuel gas holes, becomes the thin gas-flow of multiply.Spray orifice 8(quantity is returned in described outer section of combustion gas 0 ~ 6) be placed in the outer section of body of a gun horizontal component, spray orifice 9(2 ~ 10 are gone back in described inner section of combustion gas) be placed in section in body of a gun horizontal component, described body of a gun fuel gas hole 16(1 ~ 4) be placed in body of a gun vertical component, described end face fuel gas hole 17(1 ~ 3) be placed in the centripetal end end face of body of a gun horizontal component.Combustion gas and the described axial combustion air of the radial ejection from outside to inside of described body of a gun fuel gas hole 16 and described end face fuel gas hole 17 liquidate.
From Fig. 7,8 angle gas gun schematic diagrames: described angle gas gun end face 15 is equipped with 1 ~ 3 group of fuel gas hole 14(14-a, 14-b, 14-c), and described angle gas gun end face 15 is towards from inside to outside.
Combustion air passage 18 centered by described central tube 4, low speed center combustion air is axially flowed out by central tube 4, and this part wind accounts for 5 ~ 15% of total air, plays cooling root flame and the effect reducing flame of centre temperature.
Be the second combustion air passage 19 between described interior aditus laryngis 1 inboard and described central tube 4 lateral surface, in described second combustion air passage 19, combustion air axial flow is divided into two large divisions, and a part flows through swirler blades 10 one-tenth Whirl deposite tank, and this part wind accounts for 30% ~ 45% of total blast volume; Another part air, then from axial flow between cyclone outer shroud 11 and interior aditus laryngis 1, becomes axial flow wind; The combustion gas of spray orifice 9 ejection is returned through the 2 li of section combustion gas of T-shaped gas gun, with flow through cyclone Whirl deposite tank out refunds sprayed, return spray orifice 8 through outer section of combustion gas and return the combustion gas of spray vertically and axial flow wind liquidates, through body of a gun fuel gas hole 16 described in T-shaped rifle 2 and the radial combustion gas sprayed from outside to inside of described end face fuel gas hole 17, liquidate with by the axial combustion air of described second combustion air passage 19 is vertical.
From Fig. 9 for furnace flame is arranged shown in schematic diagram, fuel gas hole due to T-shaped gas gun 2 is substantially back spray or sprays from outside to inside, therefore combustion gas can mix equably with the combustion air axially flowed out from the second combustion air passage 19 to the full extent before not spraying burner throat, more unburned, and in the inboard of furnace flame, T-shaped rifle flame zone 22 forms back taper flame; Be the first combustion air passage 20 between described interior aditus laryngis 1 and outer aditus laryngis 6, combustion air is axially flowed out by the first combustion air passage 20 between interior aditus laryngis 1 and outer aditus laryngis 6.And angle gas gun end face 15 from inside to outside, the combustion air mixed combustion that the combustion gas of ejecting and the first combustion air passage 20 axially flow out, produce flame at the outside angle rifle flame zone 21 of furnace flame, combustion gas can be burnt in the space that whole burner hearth is large as far as possible.
Combustion gas and combustion air Homogeneous phase mixing in furnace cavity is burnt, avoids the generation of localized hyperthermia; Angle rifle then forms flame in the outside of T-shaped rifle flame, effectively make use of furnace cavity, reduces flame mean temperature and peak temperature, thus makes the NOx producing minute quantity, is less than 20ppm, and produces without CO.Flameholding is reliable.Single-machine capacity is maximum reaches more than 70MW.
Claims (2)
1. the gas combustion apparatus of a ultra-low NOx emission, comprise central tube, cyclone and aditus laryngis, it is characterized in that: described central tube, described cyclone, interior aditus laryngis and outer aditus laryngis are arranged from the central axis of burner is outwards coaxial successively, end, described central tube upper end lateral surface is fixedly connected with the inner ring surface of described cyclone: described central tube is built-in with center combustion air passage, be equipped with the first combustion air passage between described interior aditus laryngis and outer aditus laryngis, between outside the inboard and described central tube of described interior aditus laryngis, be equipped with the second combustion air passage; In described second combustion air passage, be equipped with multiple T-shaped gas gun and multiple angle gas gun, and described multiple T-shaped gas gun and multiple interlaced interval of angle gas gun is isometrical is uniformly distributed;
Described T-shaped gas gun is equipped with multiple fuel gas hole, be respectively that spray orifice is returned in outer section of combustion gas, spray orifice, body of a gun fuel gas hole and end face fuel gas hole are returned in inner section of combustion gas: described outer section of combustion gas is returned spray orifice and be placed in the outer section of body of a gun horizontal component, described inner section of combustion gas is returned spray orifice and is placed in section in body of a gun horizontal component, described body of a gun fuel gas hole is placed in body of a gun vertical component, and described end face fuel gas hole is placed in the centripetal end end face of body of a gun horizontal component;
Described angle gas gun end face towards from inside to outside, and is equipped with multiple angle fuel gas hole.
2. the gas collocation method of a kind of gas combustion apparatus of ultra-low NOx emission described in claim 1, is characterized in that:
(1) low speed center combustion air is by described center combustion air channel axis to outflow, and described center combustion air accounts for 5 ~ 15% of total air, plays the effect of cooling root flame and reduction flame of centre temperature;
(2) combustion gas that angle gas gun end face angle fuel gas hole ejects in described first combustion air passage, and flows through the first combustion air channel axis to the combustion air mixed combustion of flowing out, and combustion gas can be burnt in the space that whole burner hearth is large as far as possible;
(3), in described second combustion air passage, combustion air is divided into two large divisions's axial flow, and a part flows through swirler blades and becomes Whirl deposite tank, and Whirl deposite tank combustion air accounts for 30% ~ 45% of total air; Another part combustion air, then from axial flow between cyclone outer shroud and interior aditus laryngis, becomes axial flow wind; The combustion gas that spray orifice ejection is returned in the described inner section of combustion gas that T-shaped gas gun is equipped with liquidates with the Whirl deposite tank flowed out through cyclone; The combustion gas of spray orifice ejection is returned in outer section of combustion gas and described axial combustion air liquidates; Described body of a gun fuel gas hole liquidates with the combustion gas of described end face fuel gas hole radial direction ejection is vertical with described axial combustion air.
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