CN217392027U - Flue gas denitration ozone distribution device - Google Patents
Flue gas denitration ozone distribution device Download PDFInfo
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- CN217392027U CN217392027U CN202221103641.6U CN202221103641U CN217392027U CN 217392027 U CN217392027 U CN 217392027U CN 202221103641 U CN202221103641 U CN 202221103641U CN 217392027 U CN217392027 U CN 217392027U
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- Y—GENERAL 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
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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
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- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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Abstract
The utility model belongs to the technical field of low temperature ozone oxidation denitration, concretely relates to flue gas denitration ozone distributor. Comprises a contraction section flue, a throat flue and a diffusion section flue which are connected in sequence; the contraction section flue and the diffusion section flue are connected to two ends of the throat flue, the inlet end of the contraction section flue is connected with the horizontal flue at the outlet end of the induced draft fan, and the outlet end of the diffusion section flue is connected with the horizontal flue in front of the desulfurization tower; the ozone distribution main pipe is arranged outside the contraction section flue and communicated with a conveying pipeline from an ozone generator; and a plurality of ozone distribution branch pipes which are uniformly distributed outside the throat flue, wherein one ends of all the ozone distribution branch pipes are communicated with the ozone distribution main pipe into a whole, and the other ends of the ozone distribution branch pipes are inserted into the inner side of the throat flue. The device can accelerate the uniform mixing of ozone and flue gas, has good denitration effect, and avoids the waste and escape of ozone; the device has the advantages of simple structure, high operation elasticity and strong adaptability.
Description
Technical Field
The utility model belongs to the technical field of low temperature ozone oxidation denitration, concretely relates to flue gas denitration ozone distributor.
Background
At present, the industrial boiler flue gas denitration technology mainly adopts a selective catalytic reduction method (SCR method), a selective non-catalytic reduction method (SNCR method), a low-temperature oxidation method and the like.
The SCR method is to utilize a reducing agent to catalytically reduce NOx in flue gas into N in a reactor 2 To be discharged, the conventional reducing agent is NH 3 Or urea, and the reaction temperature can be selected to be between 250 and 420 ℃ according to the type of the used catalyst. The SNCR rule is to make NO in flue gas by using a reducing agent without the participation of a catalyst x Reduction to harmless N 2 And the reaction temperature window is 850-950 ℃. The low-temperature oxidation method is to oxidize insoluble low-valence nitrogen oxides into soluble high-valence nitrogen oxides by using the strong oxidizing property of an oxidizing agent, and then to absorb the nitrogen oxides in a desulfurizing tower to achieve the purpose of removing the nitrogen oxides. The oxidant is typically ozone (O) 3 ) Etc. the method can be carried out under low temperature (O) 3 Decomposition rate is enhanced when the temperature is higher than 150 ℃, so the temperature of the flue gas is not too high) and simultaneously NO in the flue gas is efficiently removed x And SO 2 And the like, and other pollutant control technologies are not influenced, and the denitration technology can be used as an efficient supplement or substitute when the traditional denitration technology is not suitable for a reaction temperature window.
In the low-temperature ozone oxidation denitration process, the oxidant O 3 The mixing degree with the flue gas is the most critical, and the size of denitration efficiency is determined. Traditional ozone distributor mostly refers to the mode of ammonia injection grid among the denitration SCR technique for reference, arranges ozone distributor in the flue before the desulfurizing tower, and the perpendicular flue gas flow direction of the type that ozone distributor mostly adopted arborescent spray tube installs in the flue, and then sets up whirl blade device in ozone distributor's downstream direction, through the direction vortex effect of blade for the even mixing of flue gas and ozone.
Because the ozone distributor is arranged in the flue, phenomena of abrasion, blockage, low mixing uniformity and the like of the spray pipe can be frequently encountered. Therefore, an ozone distribution device for uniformly mixing ozone and flue gas and promoting rapid dispersion of ozone is needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a flue gas denitration ozone distribution device for the low temperature ozone oxidation denitration technology, which can accelerate the uniform mixing of ozone and flue gas, has good denitration effect and avoids the waste and escape of ozone; the device has the advantages of simple structure, high operation elasticity and strong adaptability.
In order to achieve the above object, the utility model provides a following technical scheme does:
a flue gas denitration ozone distribution device comprises a contraction section flue, a throat flue and a diffusion section flue which are connected in sequence;
the contraction section flue and the diffusion section flue are connected to two ends of the throat flue, the inlet end of the contraction section flue is connected with the horizontal flue at the outlet end of the induced draft fan, and the outlet end of the diffusion section flue is connected with the horizontal flue in front of the desulfurization tower;
the ozone distribution main pipe is arranged outside the contraction section flue and communicated with a conveying pipeline from an ozone generator;
the ozone distribution branch pipes are uniformly distributed on the outer side of the throat flue, one ends of all the ozone distribution branch pipes are communicated with the ozone distribution main pipe into a whole through connecting pipes, and the other ends of the ozone distribution branch pipes are inserted into the inner side of the throat flue;
the contraction section flue is in a cone frustum shape, and the diameter of the contraction section flue is gradually reduced from the inlet end to the outlet end; the diffusion section flue is also in a cone frustum shape, and the diameter of the diffusion section flue is gradually increased from the inlet end to the outlet end; the diameter of the throat flue is equal to the diameter of the outlet end of the contraction section flue and the diameter of the inlet end of the diffusion section flue, and the diameters of the throat flue and the inlet end of the contraction section flue are R/2; the diameter of the inlet end of the contraction section flue is the same as that of the outlet of the diffusion section flue and is R.
As a preferred technical scheme, the ratio of the axial length of the throat flue to the diameter of the throat flue is 1: 1.
Preferably, the contraction angle a of the contraction section flue is 21 °.
Preferably, the diffusion angle beta of the diffusion section flue is 15 degrees.
As the preferred technical scheme, the included angle theta between the axis of the ozone distribution branch pipe and the axis of the throat flue is 45 degrees.
Compared with the prior art, the utility model has the following beneficial effects,
The ozone distribution device utilizes the Venturi nozzle principle of jet flow gravitation, and the ozone spray pipe is not required to be arranged in a flue, and a swirl vane device is not required to be arranged in the downstream direction. The ozone distribution branch pipes are uniformly and obliquely distributed on the peripheral side wall of the throat flue, when the flue gas flows through the ozone distribution device, the flow cross section is reduced, so that pressure difference is generated, an external suction force is provided for the mixing of ozone and the flue gas, the uniform mixing of the ozone and the flue gas can be accelerated, the denitration effect is good, and the waste and the escape of the ozone are avoided; the device has the advantages of simple structure, high operation elasticity and strong adaptability.
Drawings
FIG. 1 is a front view of an ozone distribution apparatus according to an embodiment of the present invention;
fig. 2 is a left side view of fig. 1.
In the figure: 1. a contraction section flue; 2. a throat flue; 3. a diffusion section flue; 4. distributing the main pipes; 5. a connecting pipe; 6. a distribution branch pipe; 7. a delivery conduit.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention is further described below with reference to the following embodiments.
As shown in figures 1-2, the utility model discloses a flue gas denitration ozone distribution device, including shrink section flue 1, throat flue 2, diffuse section flue 3, the female pipe 4 of ozone distribution, connecting pipe 5 and ozone distribution branch pipe 6.
The contraction section flue 1 and the diffusion section flue 3 are respectively welded at two ends of the throat flue 2, the inlet end of the contraction section flue 1 is welded with the horizontal flue at the outlet end of the induced draft fan, and the outlet end of the diffusion section flue 3 is welded with the horizontal flue in front of the desulfurization tower. An annular ozone distribution main pipe 4 is arranged on the outer side of the contraction section flue 1, and one side of the ozone distribution main pipe 4 is communicated with a conveying pipeline 7 from an ozone generator so as to input ozone into the ozone distribution main pipe; a plurality of ozone distribution branch pipes 6 are uniformly distributed on the outer side of the throat flue 2, one ends of all the ozone distribution branch pipes 6 are communicated with the ozone distribution main pipe 4 into a whole through a connecting pipe 5, the other ends of the ozone distribution branch pipes 6 are inserted into the inner side of the throat flue 2, and therefore ozone entering the ozone distribution main pipe passes through the ozone distribution branch pipes 6 and enters the throat flue 2 uniformly. Preferably, the number of ozone distribution manifolds 6 is 4.
Preferably, the contraction section flue 1 is in a cone frustum shape, and the diameter of the contraction section flue is gradually reduced from the inlet end to the outlet end; the diffusion section flue 3 is also in a cone frustum shape, and the diameter of the diffusion section flue from the inlet end to the outlet end is gradually increased; the throat flue 2 is cylindrical, the diameter of the throat flue is respectively equal to the outlet end of the contraction section flue 1 and the inlet end of the diffusion section flue 3, and the diameter of the throat flue is R/2; the diameter of the inlet end of the contraction section flue 1 is the same as that of the outlet of the diffusion section flue 3 and is R; the ratio of the axial length of the throat flue 2 to its diameter is 1: 1.
Preferably, the contraction angle α of the contraction section flue 1 is 21 °.
Preferably, the diffuser stack 3 has a diffusion angle β of 15 °.
Preferably, the axis of the ozone distributing branch pipe 6 and the axis of the throat flue form an included angle theta of 45 degrees.
The working principle is as follows: o from an ozone generator 3 The ozone enters the ozone distribution main pipe 4 through the conveying pipeline 7, and enters the throat flue 2 through the ozone distribution branch pipes 6 which are uniformly and obliquely distributed on the peripheral side wall of the throat flue, so that uniform air inlet of the throat flue is realized, incoming smoke is buffered and stabilized, stable pressure difference is formed between the ozone distribution main pipe and the throat flue, and the uniformity and stability of a flue flow field are maintained; further, by utilizing the Venturi nozzle principle, the smoke passes through the contraction section flue, the flow area is reduced, the flow velocity of the smoke is accelerated, a vacuum degree is generated at the inlet of the ozone distribution branch pipe, so that the ozone is sucked into the throat flue and enters into the expansion and expansion flue together with the smoke in a uniform mixing mannerA scattered section flue for serving as an oxidant O 3 And the denitration efficiency is improved under the highly mixing action of the flue gas.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a flue gas denitration ozone distribution device which characterized in that: comprises a contraction section flue, a throat flue and a diffusion section flue which are connected in sequence;
the contraction section flue and the diffusion section flue are connected to two ends of the throat flue, the inlet end of the contraction section flue is connected with the horizontal flue at the outlet end of the induced draft fan, and the outlet end of the diffusion section flue is connected with the horizontal flue in front of the desulfurization tower;
the ozone distributor is arranged on the outer side of the contraction section flue and communicated with a conveying pipeline from an ozone generator;
the ozone distribution branch pipes are uniformly distributed on the outer side of the throat flue, one ends of all the ozone distribution branch pipes are communicated with the ozone distribution main pipe into a whole through connecting pipes, and the other ends of the ozone distribution branch pipes are inserted into the inner side of the throat flue; the contraction section flue is in a cone frustum shape, and the diameter of the contraction section flue is gradually reduced from the inlet end to the outlet end; the diffusion section flue is also in a cone frustum shape, and the diameter of the diffusion section flue is gradually increased from the inlet end to the outlet end; the throat flue is cylindrical, the diameter of the throat flue is equal to the diameter of the outlet end of the contraction section flue and the diameter of the inlet end of the diffusion section flue, and the diameters of the throat flue and the inlet end of the contraction section flue are R/2; the diameter of the inlet end of the contraction section flue is the same as that of the outlet of the diffusion section flue and is R.
2. The flue gas denitration ozone distribution apparatus of claim 1, characterized in that: the ratio of the axial length of the throat flue to the diameter thereof is 1: 1.
3. The flue gas denitration ozone distribution apparatus of claim 1, characterized in that: the contraction angle alpha of the contraction section flue is 21 degrees.
4. The flue gas denitration ozone distribution device of claim 1, characterized in that: the diffusion angle beta of the diffusion section flue is 15 degrees.
5. The flue gas denitration ozone distribution apparatus of claim 1, characterized in that: the included angle theta between the axis of the ozone distribution branch pipe and the axis of the throat flue is 45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221103641.6U CN217392027U (en) | 2022-04-29 | 2022-04-29 | Flue gas denitration ozone distribution device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221103641.6U CN217392027U (en) | 2022-04-29 | 2022-04-29 | Flue gas denitration ozone distribution device |
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| CN217392027U true CN217392027U (en) | 2022-09-09 |
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| CN202221103641.6U Active CN217392027U (en) | 2022-04-29 | 2022-04-29 | Flue gas denitration ozone distribution device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116764424A (en) * | 2023-08-07 | 2023-09-19 | 江苏凯希盟科技有限公司 | SNCR denitration system capable of improving denitration efficiency |
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- 2022-04-29 CN CN202221103641.6U patent/CN217392027U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116764424A (en) * | 2023-08-07 | 2023-09-19 | 江苏凯希盟科技有限公司 | SNCR denitration system capable of improving denitration efficiency |
| CN116764424B (en) * | 2023-08-07 | 2024-03-08 | 江苏凯希盟科技有限公司 | SNCR denitration system capable of improving denitration efficiency |
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