CN202238363U

CN202238363U - Atomizing nozzle for reducing agent in SCR (Selective Catalytic Reduction) system

Info

Publication number: CN202238363U
Application number: CN2011203511710U
Authority: CN
Inventors: 郝庆军
Original assignee: Suzhou Powergreen Emission Solution System Co Ltd
Current assignee: Suzhou Powergreen Emission Solution System Co Ltd
Priority date: 2011-09-19
Filing date: 2011-09-19
Publication date: 2012-05-30
Anticipated expiration: 2021-09-19

Abstract

The utility model discloses an atomizing nozzle for a reducing agent in an SCR (Selective Catalytic Reduction) system. The atomizing nozzle comprises an AdBlue pipe for delivering the reducing agent, a nozzle for spraying the reducing agent, and a nozzle cover arranged between the AdBlue pipe and the nozzle, wherein spraying holes are arranged on the nozzle; a mixing region which is communicated with the spraying holes is arranged in the nozzle cover; and the reducing agent in the AdBlue pipe is sprayed to an air exhaust pipe through the spraying holes after being mixed in the mixing region in the nozzle cover. The atomizing nozzle for the reducing agent in the SCR system, disclosed by the utility model, has a compact structure; and through the tangential setting of transition holes and the setting of the mixing region, the mixing effect of the reducing agent is improved, and the purification effect of tail gas is also improved.

Description

The atomizer of reducing agent in the SCR system

Technical field

The utility model relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relates in particular to the atomizing nozzle structure of reducing agent in a kind of SCR system.

Background technology

Existing known; Nitrogen oxide through in SCR technology (SCR) the minimizing internal combustion engine especially diesel engine vent gas is a kind of general technology path; Be about to reducing agent (aqueous solution of urea) through atomizing metered injection intake and exhaust pipeline; And through the SCR catalyst the main pernicious gas NOX in the waste gas is changed into the nitrogen G&W and discharge, reach the purpose of tail gas clean-up.

The injection of reducing agent all is to be ejected in the blast pipe through atomizer; The structure of atomizer is different in the prior art; Like patent name is that " being used for the atomizing nozzle structure that liquid reducer sprays in the SCR system ", the patent No. are 201020539581.3 the disclosed nozzle arrangements of patent, and disclosed nozzle arrangements has atomizing effect preferably in this patent, but will make the reducing agent of atomizing and the waste gas in the blast pipe reach desirable reaction effect; Except atomizing effect good; Also need gas and reducing agent fully to mix, prior art does not reach desirable mixed effect, needs further to improve; In addition, in order to guarantee atomizing effect, this structure is provided with 4 spray-holes that the aperture is less, and the less spray-hole in aperture is stopped up by the reducing agent of crystallization easily, and influences the tail gas clean-up effect.

The utility model content

The purpose of the utility model is to overcome the defective of prior art, proposes the atomizer of reducing agent in a kind of SCR system with mixing, atomizing effect, to have improved tail gas clean-up efficient.

Be to realize above-mentioned purpose, the utility model proposes following technical scheme: the atomizer of reducing agent in the SCR system, comprise the blue tube of carrying reducing agent and the shower nozzle of injection reduction agent, and said shower nozzle is provided with spray-hole; Said atomizer also comprises the nozzle set that is installed between said blue tube and shower nozzle; Be provided with the Mixed Zone that is connected with said spray-hole in the said nozzle set; Reducing agent in the said blue tube is injected in the blast pipe through said spray-hole after mixing through the Mixed Zone in said nozzle set.

Also be provided with the blue tube installation portion on the said nozzle set, transitional pore, and shower nozzle installing hole, said blue tube installation portion, transitional pore, Mixed Zone and shower nozzle installing hole are communicated with setting successively.

Said transitional pore be located at the tangent direction of said Mixed Zone periphery on.

Said nozzle set is installed in the end of said blue tube through said blue tube installation portion.

Said cartridge nozzle is located on the shower nozzle installing hole of said nozzle set.

Said Mixed Zone is for being space cylindraceous.

The periphery of said blue tube also is coated with collet.

Said spray-hole is one.

Compared with prior art; The atomizing nozzle structure of reducing agent is compact in the utility model SCR system, has improved mixed effect through setting of transitional pore tangential and being provided with of Mixed Zone, has guaranteed the aperture of spray-hole simultaneously; Do not influence atomizing effect yet, improved the clean-up effect of tail gas.

Description of drawings

Fig. 1 is that the atomizer of reducing agent in the utility model SCR system stretches into the structural representation in the blast pipe;

Fig. 2 is the schematic perspective view of the atomizer of reducing agent in the utility model SCR system;

Fig. 3 is the cutaway view of the atomizer of reducing agent in the utility model SCR system;

Fig. 4 be among Fig. 3 nozzle set B to view;

Fig. 5 be among Fig. 3 nozzle set A-A to cutaway view;

Fig. 6 shows the shower nozzle that reducing agent flows to and the structural representation of nozzle set in nozzle set.

The specific embodiment

To combine the accompanying drawing of the utility model below, the technical scheme in the utility model preferred embodiment will be carried out clear, complete description.

As shown in Figure 1; The atomizer 1 of reducing agent in the SCR system that the utility model disclosed; It is inserted in the blast pipe 2 after running through the sidewall of blast pipe 2, be used for reducing agent mix and atomize after be ejected in the blast pipe 2, after waste gas in the blast pipe 2 mix; With the catalyst (not shown) generation selective catalytic reduction reaction in the blast pipe, thereby reduce the NO in the final waste gas of discharging in the blast pipe _xConcentration.

Like Fig. 2, shown in Figure 3, said atomizer 1 comprises blue tube 3, is coated on the collet 4 of blue tube 3 peripheries, and the nozzle set 5 and shower nozzle 6 that are installed in blue tube 4 ends.Said blue tube 3 is one to carry the hollow pipe of the reducing agent that goes out through SCR metering injection system metered injection, and its periphery is coated with thermal insulation ceramics 7 and collet 4, stop up to prevent the reducing agent crystallizations at high temperature in the blue tube 3, or reducing agent is rotten during high temperature.

In conjunction with Fig. 4, shown in Figure 5, said nozzle set 5 is installed in the end of blue tube 3, and nozzle set 5 is provided with the blue tube installation portion 51 that is connected successively, transitional pore 52, Mixed Zone 53, and the shower nozzle installing hole 54 that shower nozzle 6 is installed.Said blue tube installation portion 51 sets to the concave from a side of nozzle set 5 and forms, and this installation portion 51 is connected with Mixed Zone 53 through transitional pore 52.

Transitional pore 52 is the passage of reducing agent from blue tube 3 entering Mixed Zones 53, this transitional pore 52 be formed at the tangent direction of Mixed Zone 53 cross-sectional periphery on, to improve the mixed effect after reducing agent gets into the Mixed Zone.Said Mixed Zone 53 is cylindric, and this Mixed Zone 53 is the area of space of the mixed and stirring of reducing agent.

Said shower nozzle 6 is installed on the shower nozzle installing hole 54 of nozzle set 5, and shower nozzle 6 is provided with the spray-hole 61 that the Mixed Zone 53 at least one and the nozzle set 5 is connected, and the reducing agent in the blue tube 3 finally is injected in the blast pipe 2 via this spray-hole 61.

Specifically, the reducing agent in the blue tube 3 gets in the Mixed Zone 53 through 52 backs of the transitional pore on the nozzle set 5, because transitional pore 52 and Mixed Zone 53 tangent settings; According to the cyclone separator principle; As shown in Figure 6, when transitional pore 52 entering Mixed Zones 53 that reducing agent is provided with through the tangential, can Mixed Zone 53 in, form and attach the air-flow that chamber, Mixed Zone wall rotates; The reducing agent that ejects (gas-liquid mixture) fully stirs in the Mixed Zone; And spray-hole 61 is ejected into and carries out selective catalytic reduction reaction in the blast pipe 2 on shower nozzle 6, because mixing and stirring action in the Mixed Zone can form uniform suspension with aqueous solution of urea; Reduce the crystallization risk, improve the catalytic reduction reaction effect.

In the present embodiment, a hole is set on the shower nozzle can satisfies the atomizing requirement, and, stop up after therefore also being difficult for being reduced the agent crystallization because the spray-hole aperture is bigger.And in other embodiment of the utility model, the spray-hole of two spray-holes or other quantity can be set also according to expulsion pressure, to satisfy actual eject request.

Technology contents of the utility model and technical characterictic have disclosed as above; Yet those of ordinary skill in the art still maybe be based on the teaching of the utility model and announcements and are done all replacement and modifications that does not deviate from the utility model spirit; Therefore; The utility model protection domain should be not limited to the content that embodiment discloses, and should comprise various replacement and the modifications that do not deviate from the utility model, and is contained by the present patent application claim.

Claims

1.SCR the atomizer of reducing agent in the system comprises the blue tube of carrying reducing agent and the shower nozzle of injection reduction agent, said shower nozzle is provided with spray-hole; It is characterized in that: said atomizer also comprises the nozzle set that is installed between said blue tube and shower nozzle; Be provided with the Mixed Zone that is connected with said spray-hole in the said nozzle set; Reducing agent in the said blue tube is injected in the blast pipe through said spray-hole after mixing through the Mixed Zone in said nozzle set.

2. the atomizer of reducing agent in the SCR according to claim 1 system; It is characterized in that: also be provided with blue tube installation portion, transitional pore and shower nozzle installing hole on the said nozzle set, said blue tube installation portion, transitional pore, Mixed Zone and shower nozzle installing hole are communicated with setting successively.

3. the atomizer of reducing agent in the SCR according to claim 2 system is characterized in that: said transitional pore be located at the tangent direction of said Mixed Zone periphery on.

4. the atomizer of reducing agent in the SCR according to claim 2 system, it is characterized in that: said nozzle set is installed in the end of said blue tube through said blue tube installation portion.

5. the atomizer of reducing agent in the SCR according to claim 2 system, it is characterized in that: said cartridge nozzle is located on the shower nozzle installing hole of said nozzle set.

6. according to the atomizer of reducing agent in any described SCR system of claim 1 to 5, it is characterized in that: said Mixed Zone is for being space cylindraceous.

7. the atomizer of reducing agent in the SCR according to claim 6 system, it is characterized in that: the periphery of said blue tube also is coated with collet.

8. the atomizer of reducing agent in the SCR according to claim 6 system, it is characterized in that: said spray-hole is one.