CN202638273U - Low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology - Google Patents
Low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology Download PDFInfo
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- CN202638273U CN202638273U CN 201220272123 CN201220272123U CN202638273U CN 202638273 U CN202638273 U CN 202638273U CN 201220272123 CN201220272123 CN 201220272123 CN 201220272123 U CN201220272123 U CN 201220272123U CN 202638273 U CN202638273 U CN 202638273U
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Abstract
The utility model discloses a low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology. The low-gas-consumption bubble atomizing spray gun comprises a compressed air flow channel, a location board, a two-phase flow mixing room, spraying holes, a spraying gun outer casing and a bubble generating device. The side wall of one end of the spraying gun outer casing is provided with a reducing agent solution inlet and the other end of the spraying gun outer casing is provided with a nozzle cap. A plurality of the spraying holes are distributed on the end face of the nozzle cap. A two-phase flow accelerating area is arranged in the other end of the spraying gun outer casing. The compressed air flow channel is arranged in the spraying gun outer casing. One end of the compressed air flow channel passes through the end wall of one end of the spraying gun outer casing and is connected with the air inlet, and the other end of the compressed air flow channel is connected with the bubble generating device and fixed on the inner wall of the spraying gun outer casing through the location board. A bubble pouring hole is arranged on the bubble generating device. The outer side of the bubble pouring hole is provided with a bubble pouring area. The two-phase flow mixing room is arranged between the bubble pouring area and the two-phase flow accelerating area. The low-gas-consumption bubble atomizing spray gun has the advantages of being low in gas consumption rate and gas-liquid pressure and the like, and achieving atomizing effect of low energy consumption. A bubble atomizing structure enables atomizing quality to be improved and spraying distance to be enlarged, so denitration efficiency is improved.
Description
Technical field
The utility model belongs to gas-liquid injection device technique field, relates in particular to a kind of low gas consumption effervescent atomization spray gun of the SNCR of being applicable to denitration technology.
Background technology
The combustion of fossil fuel processes such as coal can be discharged a large amount of NOx pollutants, have very large harmfulness.Denitration means commonly used can be divided into denitration in the stove and the outer denitration of stove in the at present industry, and wherein SNCR method (SNCR) and selective catalytic reduction (SCR) are widely applied.SCR is a kind of denitration technology of maturation, and denitration efficiency can reach more than 90%, but needs extra SCR reactor, and floor space is large, and investment is high.In addition, the catalyst that SCR uses is expensive, and has easily poisoning and easily by problems such as dust obstructions, need periodic replacement.The SNCR denitration technology is that amino reductive is sprayed into 900～1100 ℃ of intervals in the stove, and NOx is reduced to the nitrogen G﹠W.The SNCR denitration technology does not use catalyst, denitration efficiency is lower, but adopt burner hearth as reactor, have that equipment is simple, small investment, the advantage such as floor space is few and operating cost is low, especially being fit to small-sized pulverized-coal fired boiler, CFBB, incinerator and cement decomposing furnace etc., is one of main development direction of present denitration.
In the SNCR denitrification process, the mixability of reducing agent and flue gas is the important factor for controlling that determines the denitration efficiency height.In the situation of good mixing, in the mini-reactor of laboratory, SNCR can reach the denitration rate more than 90%.Especially for the larger boiler of burner hearth, because reducing agent is difficult to even the mixing with flue gas, SNCR denitration rate generally is lower than 50% but in actual applications.
The reducing agent that the SNCR denitration is adopted mainly is low concentration ammoniacal liquor or urea liquid, sprays into burner hearth after the atomizing.Atomization quality is the key that determines mixed effect, comprises particle diameter distribution, speed and the atomization angle etc. of atomized drop.Therefore, the performance of reducing agent atomizing lance is extremely important in the SNCR denitrification process.
The atomizing type of reducing agent atomizing lance employing commonly used has mechanical atomization, strength atomizing and effervescent atomization etc. at present, and wherein atomizing nozzle is simple in structure, and is practical and convenient, but atomizing effect is poor; The pneumatic atomizing nozzle atomizing effect is better, and gas consumption rate height, gas consumption medium and reducing agent pressure are high, the shortcomings such as large and complex structure consume energy but exist.Effervescent atomization spray gun gas consumption rate is low, but this technology is still immature, and the bubble of filling liquid merges easily, and atomizing effect is difficult to guarantee.
Summary of the invention
The utility model purpose is to overcome the shortcoming of prior art, and a kind of low gas consumption effervescent atomization spray gun of the SNCR of being applicable to denitration technology is provided.
Be applicable to the low gas consumption effervescent atomization spray gun of SNCR denitration technology, comprise compressed air inlet, reductant solution import, reducing agent runner, compression air flow channel, location-plate, bubble injection region, two-phase flow mixing chamber, two-phase flow accelerating region, spray orifice, spray gun shell, bubble hand-hole, bubble generator, cap of spraying nozzle; Spray gun shell one distolateral wall is provided with the reductant solution import, spray gun shell other end end is provided with cap of spraying nozzle, arrange a plurality of spray orifices on the cap of spraying nozzle end face, be provided with the two-phase flow accelerating region in the spray gun shell other end, be provided with compression air flow channel in the spray gun shell, compression air flow channel one end passes spray gun shell one end end wall and links to each other with air intlet, the compression air flow channel other end links to each other with bubble generator, and be fixed on the spray gun outer casing inner wall by location-plate, bubble generator is provided with the bubble hand-hole, the bubble hand-hole outside is the bubble injection region, is provided with the two-phase flow mixing chamber between bubble injection region and the two-phase flow accelerating region.
Described bubble generator is the shuttle type, and the two ends diameter is little, the middle-end diameter is large, bubble injection region sectional area be the reducing agent cross section of fluid channel long-pending 20%～30%.
Described bubble generator middle-end arranges that 1～2 circle bubble hand-hole, every circle arrange 6～10 bubble hand-holes, and the aperture is 0.5～2 mm.
The described low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology is characterized in that described two-phase flow mixer length is 1.0～2.5 with the diameter ratio.
The ratio of described two-phase flow accelerating region diameter and two-phase flow mixing chamber diameter is 0.5～0.8; Two-phase flow accelerating region L/D ratio is 2～4.
Described cap of spraying nozzle is circular platform type; The side that central point arranges a spray orifice, round platform is evenly arranged 4～6 spray orifices, and the diameter of spray orifice is 1～2.5 mm, and the angle of the axis of the spray orifice of side arrangement and whole spray gun axis is 12.5～40 °.
The beneficial effect that the utility model compared with prior art has:
1) simple and reliable for structure, anti-clogging, processing cost is low;
2) adopt the effervescent atomization mode, the gas consumption rate is low, and the gas consumption rate is 5%～10% under the typical condition;
When 3) reducing agent is through the effervescent atomization device, runner dwindles, flow velocity improves, and it is little to inject the formation bubble volume this moment, and is dispersed to very soon liquid phase, the difficult merging, add the effect of two-phase flow mixing chamber and accelerating region, bubble is further disperseed and fragmentation, atomizing effect is good, atomized drop Suo Teer diameter is 30～120 μ m under the typical condition, average diameter 70 μ m;
4) less demanding to the pressure of compressed air and reductant solution, reductant solution pressure is 0.15～0.3 MPa, and as long as compressed air pressure is a little more than solution pressure, and energy-saving effect is remarkable;
5) bubble generator is replaceable, adopts different injecting holes, in order to change atomizing effect; Cap of spraying nozzle is replaceable, the convenient atomization angle of regulating.
Description of drawings
Fig. 1 is the low gas consumption effervescent atomization spray gun structure schematic diagram that is applicable to the SNCR denitration technology;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is the left view of Fig. 1;
Among the figure: compressed air inlet 1, reductant solution import 2, reducing agent runner 3, compression air flow channel 4, location-plate 5, bubble injection region 6, two-phase flow mixing chamber 7, two-phase flow accelerating region 8, spray orifice 9, spray gun shell 10, bubble hand-hole 11, bubble generator 12, cap of spraying nozzle 13.
The specific embodiment
The utility model will be further described below in conjunction with accompanying drawing:
Be applicable to the low gas consumption effervescent atomization spray gun of SNCR denitration technology, comprise compressed air inlet 1, reductant solution import 2, reducing agent runner 3, compression air flow channel 4, location-plate 5, bubble injection region 6, two-phase flow mixing chamber 7, two-phase flow accelerating region 8, spray orifice 9, spray gun shell 10, bubble hand-hole 11, bubble generator 12, cap of spraying nozzle 13; Spray gun shell 10 1 distolateral walls are provided with reductant solution import 2, spray gun shell 10 other end ends are provided with cap of spraying nozzle 13, arrange a plurality of spray orifices 9 on cap of spraying nozzle 13 end faces, be provided with two-phase flow accelerating region 8 in spray gun shell 10 other ends, be provided with compression air flow channel 4 in the spray gun shell 10, compression air flow channel 4 one ends pass spray gun shell 10 1 end end walls and link to each other with air intlet 1, compression air flow channel 4 other ends link to each other with bubble generator 12, and be fixed on spray gun shell 10 inwalls by location-plate 5, location-plate 5 plays and supports and the fixed position effect, and allow reductant solution to pass through, bubble generator 12 is provided with bubble hand-hole 11, bubble hand-hole 11 outsides are bubble injection region 6, are provided with two-phase flow mixing chamber 7 between bubble injection region 6 and the two-phase flow accelerating region 8.
Described bubble generator 12 is the shuttle type, and the two ends diameter is little, the middle-end diameter is large, and bubble injection region 6 sectional areas are 20%～30% of reducing agent runner 3 sectional areas.
Described bubble generator 12 middle-ends arrange that 1～2 circle bubble hand-hole 11, every circle arrange 6～10 bubble hand-holes 11, and the aperture is 0.5～2 mm.Bubble hand-hole 11 is for reducing the hole, and the diameter of cross section dwindles from inside to outside gradually.During reductant solution process bubble injection region 6, speed obtains larger raising, and the bubble volume of injection is little, and is dispersed to very soon liquid phase, the difficult merging.
The described low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology is characterized in that described two-phase flow mixing chamber 7 L/D ratios are 1.0～2.5.At two-phase flow mixing chamber 7, bubble and reductant solution continue fully to mix the further Uniform Dispersion of bubble.
The ratio of described two-phase flow accelerating region 8 diameters and two-phase flow mixing chamber 7 diameters is 0.5～0.8; Two-phase flow accelerating region 8 L/D ratios are 2～4.Because flow area dwindles, the gas-liquid two-phase flow flow velocity is accelerated, and turbulivity increases, and bubble occurs further broken.
Described cap of spraying nozzle 13 is circular platform type; The side that central point arranges a spray orifice 9, round platform is evenly arranged 4～6 spray orifices 9, and the diameter of spray orifice 9 is 1～2.5 mm, and the angle of the axis of the spray orifice 9 of side arrangement and whole spray gun axis is 12.5～40 °, forms 25～80 ° spraying torch.
The outer wall of low gas consumption effervescent atomization spray gun all adopts heat resisting steel to make, and remaining part adopts common straightcarbon steel.
The compressed air that the atomizing lance that the utility model provides adopts and the pressure of reductant solution require lower, as long as reach 0.15～0.3 MPa, compressed air pressure will be a little more than solution pressure.Compressed air enters bubble generator 12 through compression air flow channel 4, from bubble hand-hole 11 bubble is injected reductant solution, forms gas-liquid two-phase flow.Through two-phase flow mixing chamber 7 and two-phase flow accelerating region 8, bubble further mixes in solution and is broken, and last gas-liquid two-phase flow forms the spraying torch from spray orifice 9 ejections.The spraying torch atomization angle be 25～80 °, jet length reach 3～6 meters.Atomizing effect is good, and atomized drop Suo Teer diameter is 30～120 μ m under the typical condition, average diameter 70 μ m.
The atomizing lance that the utility model provides has overcome the shortcoming that present spray gun atomizing effect is poor, energy consumption is high, has the advantages such as the gas consumption rate is low, gas-liquid pressure is low, has reached energy-conservation purpose.The effervescent atomization structure of unique design makes that atomization quality improves, jet length is large, can improve the SNCR denitration efficiency.
Claims (6)
1. a low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology is characterized in that comprising compressed air inlet (1), reductant solution import (2), reducing agent runner (3), compression air flow channel (4), location-plate (5), bubble injection region (6), two-phase flow mixing chamber (7), two-phase flow accelerating region (8), spray orifice (9), spray gun shell (10), bubble hand-hole (11), bubble generator (12), cap of spraying nozzle (13); Spray gun shell (10) one distolateral walls are provided with reductant solution import (2), spray gun shell (10) other end end is provided with cap of spraying nozzle (13), arrange a plurality of spray orifices (9) on cap of spraying nozzle (13) end face, be provided with two-phase flow accelerating region (8) in spray gun shell (10) other end, be provided with compression air flow channel (4) in the spray gun shell (10), compression air flow channel (4) one ends pass spray gun shell (10) one end end walls and link to each other with air intlet (1), compression air flow channel (4) other end links to each other with bubble generator (12), and be fixed on spray gun shell (10) inwall by location-plate (5), bubble generator (12) is provided with bubble hand-hole (11), bubble hand-hole (11) outside is bubble injection region (6), is provided with two-phase flow mixing chamber (7) between bubble injection region (6) and the two-phase flow accelerating region (8).
2. the low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology according to claim 1, it is characterized in that, described bubble generator (12) is the shuttle type, the two ends diameter is little, the middle-end diameter is large, and bubble injection region (6) sectional area is 20%～30% of reducing agent runner (3) sectional area.
3. the low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology according to claim 1, it is characterized in that, described bubble generator (12) middle-end arranges that 1～2 circle bubble hand-hole (11), every circle arrange 6～10 bubble hand-holes (11), and the aperture is 0.5～2 mm.
4. according to the low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology claimed in claim 1, it is characterized in that described two-phase flow mixing chamber (7) L/D ratio is 1.0～2.5.
5. the low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology according to claim 1 is characterized in that, the ratio of described two-phase flow accelerating region (8) diameter and two-phase flow mixing chamber (7) diameter is 0.5～0.8; Two-phase flow accelerating region (8) L/D ratio is 2～4.
6. the low gas consumption effervescent atomization spray gun that is applicable to the SNCR denitration technology according to claim 1 is characterized in that described cap of spraying nozzle (13) is circular platform type; The side that central point arranges a spray orifice (9), round platform is evenly arranged 4～6 spray orifices (9), and the diameter of spray orifice (9) is 1～2.5 mm, and the angle of the axis of the spray orifice of side arrangement (9) and whole spray gun axis is 12.5～40 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220272123 CN202638273U (en) | 2012-06-11 | 2012-06-11 | Low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220272123 CN202638273U (en) | 2012-06-11 | 2012-06-11 | Low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology |
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| CN202638273U true CN202638273U (en) | 2013-01-02 |
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| CN 201220272123 Withdrawn - After Issue CN202638273U (en) | 2012-06-11 | 2012-06-11 | Low-gas-consumption bubble atomizing spray gun suitable for selective non-catalytic reduction (SNCR) denitration technology |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671533A (en) * | 2012-06-11 | 2012-09-19 | 杭州浙大天元科技有限公司 | Low-air consumption effervescent atomizer applicable to SNCR (selective non-catalytic reduction) denitrification technology |
| CN103170231A (en) * | 2013-04-10 | 2013-06-26 | 南京西普水泥工程集团有限公司 | Spray gun specially for selective non-catalytic reduction (SNCR) denitration process |
| CN104353567A (en) * | 2014-11-13 | 2015-02-18 | 河南海力特机电制造有限公司 | High pressure fine water mist spray gun for SNCR (selective non-catalytic reduction) denitration system |
| CN107999296A (en) * | 2017-11-27 | 2018-05-08 | 常州五王电机有限公司 | The resistance to thermic lance of SNCR denitration two-fluid voltage stabilizing |
| CN108014625A (en) * | 2017-11-27 | 2018-05-11 | 常州五王电机有限公司 | SNCR denitration two-fluid voltage stabilizing spray gun |
-
2012
- 2012-06-11 CN CN 201220272123 patent/CN202638273U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102671533A (en) * | 2012-06-11 | 2012-09-19 | 杭州浙大天元科技有限公司 | Low-air consumption effervescent atomizer applicable to SNCR (selective non-catalytic reduction) denitrification technology |
| CN102671533B (en) * | 2012-06-11 | 2014-04-09 | 杭州浙大天元科技有限公司 | Low-air consumption effervescent atomizer applicable to SNCR (selective non-catalytic reduction) denitrification technology |
| CN103170231A (en) * | 2013-04-10 | 2013-06-26 | 南京西普水泥工程集团有限公司 | Spray gun specially for selective non-catalytic reduction (SNCR) denitration process |
| CN104353567A (en) * | 2014-11-13 | 2015-02-18 | 河南海力特机电制造有限公司 | High pressure fine water mist spray gun for SNCR (selective non-catalytic reduction) denitration system |
| CN107999296A (en) * | 2017-11-27 | 2018-05-08 | 常州五王电机有限公司 | The resistance to thermic lance of SNCR denitration two-fluid voltage stabilizing |
| CN108014625A (en) * | 2017-11-27 | 2018-05-11 | 常州五王电机有限公司 | SNCR denitration two-fluid voltage stabilizing spray gun |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130102 Effective date of abandoning: 20140409 |
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| RGAV | Abandon patent right to avoid regrant |