CN202849078U - Novel spray gun applied to urea pryolysis ammonia production system - Google Patents
Novel spray gun applied to urea pryolysis ammonia production system Download PDFInfo
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- CN202849078U CN202849078U CN 201220487889 CN201220487889U CN202849078U CN 202849078 U CN202849078 U CN 202849078U CN 201220487889 CN201220487889 CN 201220487889 CN 201220487889 U CN201220487889 U CN 201220487889U CN 202849078 U CN202849078 U CN 202849078U
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Abstract
The utility model aims at providing a novel spray gun applied to a urea pryolysis ammonia production system, which realizes more uniform and more stable atomization of the urea spray gun. The spray gun comprises a urea liquid inlet, a compressed air inlet and a nozzle, and is characterized in that the urea liquid inlet and the compressed air inlet are respectively connected with the nozzle through a pipeline with a swirler. By adopting the swirler, uniform distribution and buffer adjustment to the material can be realized, and the integrating degree of atomized liquid sprayed by the spray gun with existing flow field and temperature field can be higher after flowing into a pryolytic furnace, the destruction to the spray gun can be reduced, and risk of causing serious accidents by small failures can be avoided.
Description
Technical field
The utility model relates to the urea pyrolysis ammonia system processed in manufacturing field, particularly a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed.
Background technology
Urea is as one of denitrification reducing agent three large main raw materials since its in security, be beneficial to the huge advantage of the aspects such as transportation, along with the national policy rules are more and more stricter to the requirement of security, and obtained using more and more widely.Especially in the power plant of Outskirts of City, urea as reductive agent first select to be applied in the denitrating system.
Be applied in the denitration restoring system at urea pyrolysis ammonia processed, the performance of urea spray gun has directly affected the pyrolytic reaction performance in the urea pyrolysis stove.Existing urea soln spray gun mostly adopts the mode of double-channel gas atomizing, ubiquitous problem is because the interior working conditions of the inhomogeneous pyrolysis oven that causes of atomised jet is unstable, the specific region temperature occurs easily and sharply descend, and then cause that pyrolytic reaction is incomplete, form crystallization.
In urea pyrolysis ammonia system processed, originally external except pyrolysis oven, the design of spray gun is also very crucial.Because pyrolytic reaction is mainly carried out on the surface of atomizing droplet, so the even distribution character of the size of atomizing droplet, atomizing droplet etc. all have important impact to the effect of pyrolytic reaction.Therefore the design of urea spray gun is directly connected to the generating rate and stability of ammonia after the pyrolytic reaction, also is related to the utilization ratio of urea soln simultaneously.Exploitation is specially adapted for the spray gun of urea pyrolysis ammonia system processed, has been that whole pyrolysis system is efficient, the key guarantee of steady running.
Existing gun design generally adopts the two channels form, is 200920065058.9 Chinese patent " nano-bubble water-coal-slurry spraying gun " such as the patent No..Utilize this kind spray gun that urea soln is entered spray gun from different passages respectively with atomizing air, shear liquid by pressurized air at a high speed, form atomizing droplet.The atomizing of urea soln is take air atomizing as main, and pressurized air maintains less pressure range.Because the singularity of urea so urea spray gun is higher to compressed-air actuated quality requirements, can not contain too much oil in the pressurized air, particulate matter etc., otherwise cause easily obstruction.When locally stopping up appears in spray gun, the atomized droplet footpath is inhomogeneous or emitted dose distributes when also inhomogeneous, may be at inner part or the bulk temperature skewness of forming of pyrolysis oven, single spray gun urea injecting quantity is too much or very few, thereby causes crystallization.In a single day crystallization forms, and will have a strong impact on the ammonia performance processed of whole pyrolysis system, and then affect the overall operation of follow-up SCR denitration.
The main drawback of existing urea spray gun:
Spray gun is the caused path partially obstruction of incidental impurities in operational process because in the pressurized air, or because the obstruction that urea causes in the inner formation of spray gun crystallization.Stop up in case form, can have a strong impact on the motion in passage of pressurized air and urea soln, it is inhomogeneous, unstable to cause flowing, and and then have influence on the atomizing effect of solution, it is inhomogeneous to form atomization droplets diameter.Atomization droplets diameter inhomogeneous caused detrimentally affect to the pyrolytic reaction in the follow-up pyrolysis oven, and the urea soln deposition that the result causes the pyrolysis oven afterbody not react completely forms mass crystallization, when serious even the maintenance of should stopping transport.
Because the emitted dose of urea is to be determined by ammonia amount required in the SCR reactor, and what of ammonia amount are determined that by boiler load the time of response of pyrolysis system is generally 5～15 seconds.If boiler load changes, the emitted dose of urea spray gun is in the process that changes suddenly, the atomized liquid drip of ejection will form original gas flow pattern in the pyrolysis oven and impact, destroy original flow field in the pyrolysis oven, cause simultaneously temperature field in furnace inhomogeneous, the local temperature drop that forms rapidly, thereby because the not enough urea crystals that causes of pyrolysis temperature.This class crystallization also can cause the pyrolysis decrease in efficiency when serious, even can not normally use in case formation will be attached to the pyrolysis oven wall and be deposited on the pyrolysis oven afterbody.
Simultaneously, owing to serious obstruction or the reasons such as corrosion and impact, cause spray gun that the time in 1～2 year is only arranged average work-ing life, have in addition only have the time in 1 year of less than.This has just caused the frequent of urea spray gun, has also directly caused the increase of urea pyrolysis ammonia system cost processed.
In view of this, special the utility model that proposes.
Summary of the invention
The purpose of this utility model provides a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed, makes the atomizing of urea more even, more stable, has prevented that the urea-spray atomizing from causing the phenomenon of crystallization.Also can reduce simultaneously owing to the impure spray gun blockage problem that causes of pressurized air, prolong the life cycle of spray gun.
For achieving the above object, the technical solution adopted in the utility model is: a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed, comprise the urea soln entrance, compressed air inlet and nozzle, the pipeline intersection is passed through respectively in nozzle in described urea soln entrance and compressed air inlet, it is characterized in that: be respectively arranged with swirler on the described pipeline.
Further, described pipeline intersection concrete structure is that double-skin duct consists of, passage centered by the passage that the inner layer tube wall of double-skin duct forms, and the passage that the inner layer tube wall of double-skin duct and outer wall form is outer ring channel; Perhaps pipeline intersection concrete structure is to be provided with piping medullary ray and two long strip shape baffle plates that end face is connected with inner-walls of duct in the pipeline, and pipeline one side and baffle plate form first channel, and pipeline opposite side and baffle plate form second passage.
Further, be provided with the first straight tube on the pipeline of described swirler inlet end.
Further, the length of described the first straight tube 〉=10 times channel diameter.
Further, be provided with necking pipe on the double-skin duct of described swirler exit end, the swirler exit end is connected with the large mouth of necking pipe.
Further, the number of degrees of the cone angle of described necking pipe are between 20 to 40.
Further, be provided with the second straight tube on the double-skin duct between described necking pipe and the nozzle.
Further, the length of described the second straight tube 〉=6 times channel diameter, 0.5 times of the diameter of its diameter≤first straight tube.
Further, described swirler is fixed on the tube wall place of the exit end of the first straight tube.
The beneficial effects of the utility model are:
The utility model by simple built-in swirler is set, has been realized even distribution and dash adjustment to material, and the obstruction of also having avoided simultaneously the impurity in the pressurized air to cause has realized the optimized running of spray gun.
The utility model, pass through said structure, after the atomizing droplet that spray gun is sprayed flows to pyrolysis oven, higher with the compatible degree in original flow field and temperature field, in the situation that boiler load changes, can better keep the distribution in original flow field and temperature field, not damage, have the utmost point widely adaptability and applicability.
The utility model by swirler is installed, has reduced the destruction of spray gun, has reduced replacing or has repaired the expense that spray gun causes, has prolonged the periodical repair cycle, has reduced cost of labor, has also avoided simultaneously because glitch causes the harm of major disaster.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is system construction drawing of the present utility model.
Fig. 2 is system of the present utility model cross-section structure.
Fig. 3 is system of the present utility model end face structure iron.
Fig. 4 is the cross section place figure of the swirler that arranges on the utility model outer-loop passage.
Description of symbols among the figure: 1-urea soln entrance, 2-compressed air inlet, 3-swirler, 4-outer ring channel, 5-centre channel, 6-nozzle, 7-necking pipe, 8-the first straight tube, 9-the second straight tube, 10 pipelines, 11-first channel, 12-second passage, 13-baffle plate.
Embodiment
Below in conjunction with embodiment the utility model is described in more detail.
Shown in Fig. 1,2 and 4,
The utility model, shown pipeline 10 have double-skin duct to consist of.The passage that the passage that the inner tube of described double-skin duct forms and inner tube and outer tube form is respectively centre channel 5 and outer ring channel 4.Connect urea soln entrance 1 and nozzle 6 by centre channel 5, connect compressed air inlet 2 and nozzle 6 by outer ring channel 4.Described centre channel 5 and outer ring channel 4 be respectively arranged with swirler 3. and, on the double-skin duct of swirler 3 inlet ends, be provided with 〉=the first straight tube 8 of 10 times of channel diameters.On the double-skin duct of swirler 3 exit end, be provided with necking pipe 7, its tapering is between 20 to 40.On the double-skin duct between necking pipe 7 and the nozzle 6, be provided with 〉=the second straight tube 9 of 6 times of channel diameters, its diameter is 0.5 times of the first straight tube 8 diameters.The inner tube of described double-skin duct and outer tube spacing are 1 ~ 5mm, and it can slightly adjust according to the particular case of actual items.At least one is installed in described nozzle 6 on the double-skin duct of the second straight tube 9 exit end.
Swirler 3 described in the utility model is a kind of two-phase or multiphase separation, mixing equipment of being used widely at engineering field.After material tangentially enters swirler inside with certain pressure from the swirler periphery, can form the strong rotational shear turbulent flow of strong Three-Dimensional Elliptic, in this process, material is realized mixing fully and is uniform.Because the existence of swirler 3 has formed strong rotating fluid, strengthened and washed away, collided effect simultaneously, also reduced to a great extent the possibility of stopping up.
The utility model, described centre channel 5 and the outer ring channel 4 interior swirlers 3 that all are provided with, the pattern that swirler 3 adopts is axial rotary vane type.The pattern of outer ring channel 4 inward eddy devices 3 is smaller, is arranged symmetrically, and the inner layer tube wall that is fixed on double-skin duct is inboard.Main Function is by strong eddy flow, strengthen compressed-air actuated shear effect, and by washing away of strengthening with collide effect, impurity in the pressurized air all can be intercepted and captured by swirler 3, and be rotated air-flow and take away and enter pyrolysis oven, pressurized air has obtained further purification on the one hand, has guaranteed the effect of atomizing, avoided on the other hand that contained oils, particulate matter class impurity results in blockage in the pressurized air in the spray gun passage, solved spray gun and held a susceptible to plugging difficult problem.
The utility model, the pattern of described centre channel 5 inward eddy devices 3 is bigger, axial arranged, is fixed on the outer wall inboard of double-skin duct by the frame flange of swirler.Main Function is by cyclonic action so that urea soln guarantees evenly to distribute fully before atomizing, obtains equally distributed size droplet diameter in the time of can guaranteeing to atomize like this.Simultaneously when boiler load changes, can play buffering by the cyclonic action of swirler 3, so that urea droplet mobile has a relatively slowly progressive formation after the atomizing, very large impact is not caused in the flow field in the pyrolysis oven and temperature field, eliminate because the problem of the unstable pyrolysis oven intercrystalline that causes of urea solution jet amount.
Shown in Fig. 1,3,
The utility model is provided with the baffle plate 13 of piping diameter in the shown pipeline 10, it will be divided into independently first channel 11 and 12 two passages of second passage in the pipeline 10.Connect urea soln entrance 1 and nozzle 6 by first channel 11, connect compressed air inlet 2 and nozzle 6 by second passage 12.Described first channel 11 and second passage 12 be respectively arranged with swirler 3. and, on the pipeline 10 of swirler 3 inlet ends, be provided with 〉=the first straight tube 8 of 10 times of channel diameters.On the pipeline 10 of swirler 3 exit end, be provided with necking pipe 7, its tapering is between 20 to 40.On the pipeline 10 between necking pipe 7 and the nozzle 6, be provided with 〉=the second straight tube 9 of 6 times of channel diameters, its diameter is 0.5 times of the first straight tube 8 diameters.At least one is installed in described nozzle 6 on the double-skin duct of the second straight tube 9 exit end, and it can slightly adjust according to the particular case of actual items.
Shown in Fig. 1,4
The utility model, shown swirler 3 are fixed on the inwall of pipeline 10 the frame flange that arranges by swirler 3, and it also can be fixed on the outer wall of pipeline 10 by the frame flange.Any one fixed forms such as and described flange is fixing can be fixed for bolt, and screw thread is fixed or clip is fixing.
The utility model, by simple built-in swirler 3 is set, even distribution and dash adjustment to material have been realized, after the atomizing droplet that spray gun is sprayed flows to pyrolysis oven, higher with the compatible degree in original flow field and temperature field, and reduced the destruction to spray gun, avoided because glitch causes the harm of major disaster.
It should be noted that; above-mentioned specific embodiment only is exemplary; under above-mentioned instruction of the present utility model, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion drop in the protection domain of the present utility model.
It will be understood by those skilled in the art that top specific descriptions just in order to explain the purpose of this utility model, is not for restriction the utility model.Protection domain of the present utility model is limited by claim and equivalent thereof.
Claims (9)
1. novel spray gun that is applied to urea pyrolysis ammonia system processed, comprise urea soln entrance (1), compressed air inlet (2) and nozzle (6), pipeline (10) intersection is passed through respectively in nozzle (6) in described urea soln entrance (1) and compressed air inlet (2), it is characterized in that: be respectively arranged with swirler (3) on the described pipeline (10).
2. a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 1, it is characterized in that: described pipeline (10) consists of for double-skin duct, passage (5) centered by the passage that the inner layer tube wall of double-skin duct forms, the passage that the inner layer tube wall of double-skin duct and outer wall form is outer ring channel (4);
Perhaps pipeline (10) intersection concrete structure is to be provided with piping (10) medullary ray and two long strip shape baffle plates (13) that end face is connected with pipeline (10) inwall in the pipeline (10), pipeline (10) one sides and baffle plate (13) form first channel (11), and pipeline opposite side and baffle plate (13) form second passage (12).
3. any described a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 1 is characterized in that: be provided with the first straight tube (8) on the pipeline (10) of described swirler (3) inlet end.
4. a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 3 is characterized in that: the length of described the first straight tube (8) 〉=10 times of channel diameters.
5. any described a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 1, it is characterized in that: be provided with necking pipe (7) on the double-skin duct of described swirler (3) exit end, swirler (3) exit end is connected with the large mouth of necking pipe (7).
6. a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 5, it is characterized in that: the number of degrees of the cone angle of described necking pipe (7) are between 20 to 40.
7. any described a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 5 is characterized in that: be provided with the second straight tube (9) on the double-skin duct between described necking pipe (7) and the nozzle (6).
8. a kind of novel spray gun that is applied to urea pyrolysis ammonia system processed according to claim 7 is characterized in that: the length of described the second straight tube (9) 〉=6 times of channel diameters, 0.5 times of the diameter of its diameter≤the first straight tube (8).
9. according to claim 1 any one is applied to the novel spray gun of urea pyrolysis ammonia system processed, it is characterized in that: described swirler (3) is fixed on the tube wall place of the exit end of the first straight tube (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220487889 CN202849078U (en) | 2012-09-21 | 2012-09-21 | Novel spray gun applied to urea pryolysis ammonia production system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220487889 CN202849078U (en) | 2012-09-21 | 2012-09-21 | Novel spray gun applied to urea pryolysis ammonia production system |
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| Publication Number | Publication Date |
|---|---|
| CN202849078U true CN202849078U (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220487889 Expired - Fee Related CN202849078U (en) | 2012-09-21 | 2012-09-21 | Novel spray gun applied to urea pryolysis ammonia production system |
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| CN (1) | CN202849078U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103230740A (en) * | 2013-04-25 | 2013-08-07 | 朱跃 | SNCR (selective non-catalytic reduction) swirl atomization spray gun with bluff body device |
| CN103723743A (en) * | 2013-10-10 | 2014-04-16 | 西安交通大学 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
-
2012
- 2012-09-21 CN CN 201220487889 patent/CN202849078U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103230740A (en) * | 2013-04-25 | 2013-08-07 | 朱跃 | SNCR (selective non-catalytic reduction) swirl atomization spray gun with bluff body device |
| CN103723743A (en) * | 2013-10-10 | 2014-04-16 | 西安交通大学 | Reactor for urea pyrolysis to produce ammonia for flue gas denitration |
| CN104897291A (en) * | 2015-03-30 | 2015-09-09 | 北京京能电力股份有限公司石景山热电厂 | Urea pyrolyzing furnace deposit monitoring method and system |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: CHINA DATANG GROUP ENVIRONMENT TECHNOLOGY CO.,LTD. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG ENVIRONMENT INDUSTRY GROUP Co.,Ltd. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Address after: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee after: DATANG TECHNOLOGY INDUSTRY GROUP CO.,LTD. Address before: 100097 Beijing Haidian District Zizhuyuan Road No. 120 Patentee before: DATANG TECHNOLOGY INDUSTRY Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130403 Termination date: 20210921 |
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| CF01 | Termination of patent right due to non-payment of annual fee |