CN104912632A - Diesel engine selective catalytic reduction system nozzle - Google Patents
Diesel engine selective catalytic reduction system nozzle Download PDFInfo
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- CN104912632A CN104912632A CN201510164923.5A CN201510164923A CN104912632A CN 104912632 A CN104912632 A CN 104912632A CN 201510164923 A CN201510164923 A CN 201510164923A CN 104912632 A CN104912632 A CN 104912632A
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Abstract
The invention relates to the technical field of diesel engine atomization devices, in particular to a diesel engine selective catalytic reduction system nozzle which comprises a compressed air circulating pipeline and a urea aqueous solution circulating pipeline. The compressed air circulating pipeline comprises a starting section air pipe (1), a middle section first air collecting cavity (13), a middle section first air channel (34), a guiding section second air channel (41) and an outlet section air pipe (5). The urea aqueous solution circulating pipeline comprises a starting section urea pipe (2), a middle section first solution collecting cavity (23), a middle section first urea channel (35), a guiding section second urea channel (42) and an outlet section urea pipe (6). The outlet section air pipe (5) is perpendicular to the guiding section second air channel (41), and the outlet section urea pipe (6) is perpendicular to the guiding section second urea channel (42). The diesel engine selective catalytic reduction system nozzle is remarkable in atomization effect, can remarkably improve the NOx conversion efficiency, and has wide application prospects.
Description
Technical field
The present invention relates to atomizer for diesel engine technical field, relate generally to a kind of diesel engine selective catalytic reduction system operating nozzle for air supplementary mode, be specifically related to a kind of diesel engine selective catalytic reduction system operating nozzle.
Background technique
Selective catalytic reduction system operating is referred to as SCR or SCR system, and SCR (selective catalytic reduction system operating) is the english abbreviation of Selective (selectivity), Catalytic (catalysis), Reduction (reduction).Selective catalytic reduction system operating is a kind of technology be widely used, and is mainly used in eliminating the nitrogen oxide in waste gas.In order to be also nitrogen by conversion of nitrogen oxides effectively at a lower temperature, appropriate reducing agent and catalyzer are the requisite constituent elements of SCR system.
The SCR aftertreatment system nozzle circulated in the market, has internal-mixing and external mixture type two kinds.
Internal-mixing nozzle has again two kinds of modes, and a kind of is, after aqueous solution of urea and pressurized air provide different pipelines to enter nozzle, mix in nozzle interior; Another kind is that aqueous solution of urea and pressurized air just mix before entering the nozzle, then enters nozzle; The exit design of above-mentioned two kinds of internal-mixing nozzles has uniform aperture, by adjusting diameter and the direction of aperture, and adjustment atomizing effect.The drawback of this kind of nozzle is, one, and aperture difficulty of processing is very high, causes processing cost high; Its two, because pipeline is longer, system responses is slower.
Outer mixed mode nozzle and aqueous solution of urea and pressurized air enter nozzle by different pipelines, passing through separately independently medium channel, directly spray from nozzle, aqueous solution of urea and pressurized air mix in the outlet port of nozzle, by adjusting shape and the relative position of outlet port aqueous solution of urea and compressed air outlet section, adjustment atomizing effect.The drawback of this kind of nozzle is that nozzle installs relative complex, and urea-spray direction and airflow direction generally in 45 degree, are unfavorable for jet atomization.
Summary of the invention
The technical problem that the present invention solves is: the reaction efficiency of SCR system has much room for improvement at present, and the conversion efficiency of NOx is low; The rate of fault of nozzle is higher; NO in urea liquid and tail gas
xmixed effect need to strengthen.
The object of the invention is the reaction efficiency in order to improve SCR system: the conversion efficiency improving NOx; Reduce the rate of fault of nozzle; Strengthen the mixed effect of the NOx in urea liquid and tail gas, a kind of technological scheme of the diesel SCR nozzle for air supplementary mode is provided.
The invention discloses a kind of SCR nozzle for air supplementary mode, it comprises exhaust pipe installation group cover, guide section pipeline, ozzle fitting seat, the initial segment air duct, the initial segment urea tube, outlet section air duct, outlet section urea tube etc.Nozzle comprises pressurized air flow pipe and aqueous solution of urea flow pipe, pressurized air flow pipe and aqueous solution of urea flow pipe completely independent, the outlet section pipeline of pressurized air and aqueous solution of urea and the installation in 90 ° of guide section pipeline, pressurized air and aqueous solution of urea mix at nozzle exterior.
Specifically, for the deficiencies in the prior art, the invention provides following technological scheme:
A kind of diesel engine selective catalytic reduction system operating nozzle, it is characterized in that, comprise pressurized air flow pipe and aqueous solution of urea flow pipe, described pressurized air flow pipe comprises the initial segment air duct 1, intermediate section first air collecting chamber 13 and the first air passageways 34, guide section second air passageways 41 and outlet section air duct 5, and described aqueous solution of urea flow pipe comprises the initial segment urea tube 2, intermediate section first liquid collecting cavity 23 and the first urea passage 35, guide section second urea passage 42 and outlet section urea tube 6; Described outlet section air duct 5 is vertical with guide section second air passageways 41 to be arranged, and described outlet section urea tube 6 is vertical with guide section second urea passage 42 to be arranged.
Preferably, in said nozzle, the device of described intermediate section is ozzle fitting seat 3, and the device of described guide section is guide pipe 4;
Wherein, described ozzle fitting seat 3 is top 3a near one end of air duct 1 and urea tube 2, and the other end is bottom 3b; Top 3a be provided with for the initial segment air duct 1 carry out step location the first groove 31 and for carrying out the second groove 32 of step location with the initial segment urea tube 2, bottom 3b is provided with the 3rd groove 33 for coordinating with guide pipe 4, wherein, described second groove bottom is provided with the conical surface 321 to the convergence of its circular hole axle center, and described the initial segment air duct 1 and the initial segment urea tube 2 form the first air collecting chamber 13 and the first liquid collecting cavity 23 with the conical surface 321 of the first groove 31 and the second groove 32 respectively.
Preferably, in said nozzle, described first groove 31 bottom is being provided with near side, ozzle fitting seat center the first air passageways 34 be communicated with the 3rd groove 33.
Preferably, in said nozzle, the conical surface 321 bottom of described second groove 32 is provided with the first urea passage 35 be communicated with the 3rd groove 33.
Preferably, in said nozzle, described 3rd groove 33 depart from side, ozzle fitting seat center be provided with prevent guide pipe 4 assemble dislocation positioning groove 332.
Preferably, in said nozzle, described guide pipe 4 is inner is axially provided with independently the second air passageways 41 and the second urea passage 42 that be parallel to each other, described guide pipe 4 is top 4A near one end of ozzle fitting seat 3, the other end is bottom 4B, and the top 4A of guide pipe 4 is provided with the gap 43 for being communicated with the second air passageways 41 and the first air passageways 34.
Preferably, in said nozzle, be provided with the projection 44 preventing guide pipe 4 from assembling dislocation in the 4A periphery, top of guide pipe 4.
Preferably, in said nozzle, described guide pipe 4 is provided with the compressed air outlet pipe mounting groove 45 of right angle type at bottom 4B, described air outlet slit pipe mounting groove 45 comprises and the end face 451 that the second air passageways 41 communicates and the side 452 parallel with the second urea passage 42, and described guide pipe 4 cuts formation right angle locating slot 453 at bottom 4B from the side 452 of mounting groove 45.
Preferably, in said nozzle, described second urea passage 42 bottom is provided with urea outer pipe mounting groove 46, described urea outer pipe mounting groove 46 is the arc groove of connection second urea passage 42 and air outlet slit pipe mounting groove 5 side 452, comprise inner cylindrical surface 461 and the locating face 462 along guide pipe 4 axis, described inner cylindrical surface 461 is lower than the bottom of the second urea passage 42.
Preferably, in said nozzle, described outlet section air duct 5 is the U-shaped seal structure of inner hollow, comprise the first attachment face 54 for matching with air outlet manifold mounting groove 45 end face 451 and the second attachment face 55 perpendicular to the first attachment face 54, described first attachment face 54 is provided with the air interface 52 be communicated with the second air passageways 41 and match with guide pipe 4 outer circumferential face first locates chimb 541.
Preferably, in said nozzle, described second attachment face 55 matches with air outlet manifold mounting groove 45 side 452, and described second attachment face 55 is provided with second locates chimb 551 for what coordinate with locating slot 453.
Preferably, in said nozzle, described outlet section air duct 5 is being provided with the one side that the second attachment face 55 opposes the air outlet slit 53 be communicated with hollow space.
Preferably, in said nozzle, the second cylindrical tube portion 65 that described outlet section urea tube 6 comprises the first cylindrical tube portion 64, diameter is less than the first cylindrical tube portion 64 comprises the locating face 611 for connecting with aqueous solution of urea pipe mounting groove 46 locating face 462 and the external cylindrical surface 612 for connecting with aqueous solution of urea pipe mounting groove 46 inner cylindrical surface 461 with the conical pipe portion 63 in order to be connected the first cylindrical tube portion 64 and the second cylindrical tube portion 65, described first cylindrical tube portion 64; The inner chamber in described first cylindrical tube portion 64 and conical pipe portion 63 forms the second liquid collecting cavity 61.
Preferably, in said nozzle, described second inside, cylindrical tube portion 65 is provided with aqueous solution of urea outlet passage 62, described second cylindrical tube portion 65 external diameter is slightly less than the internal diameter of the air outlet slit 53 of outlet section air duct 5, after outlet section urea tube 6, outlet section air duct 5 and guide pipe 4 coordinate, the outer surface of described outlet section urea tube 6 and the internal surface of outlet section air duct 5 form the second air collecting chamber 51.
Preferably, in said nozzle, after outlet section urea tube 6, outlet section air duct 5 and guide pipe 4 coordinate, the export department exterior edge face 621 of outlet section urea tube 6 is a little more than the export department exterior edge face 531 of outlet section air duct 5.
Preferably, in said nozzle, described nozzle also comprises nozzle installation group cover 7, and described nozzle installation group cover 7 comprises positioning device 72 and clamp device 71;
Wherein, described positioning device 72 inside is provided with the step circular hole running through end face and bottom surface, described step circular hole comprise to coordinate with guide pipe 4 outer circumferential face in step circular hole 721 and the outer step circular hole 722 that coordinates with clamp device 71.
Preferably, in said nozzle, described positioning device 72 outer circumferential face be provided with for by nozzle the location be installed on exhaust pipe play 73.
Preferably, in said nozzle, described clamp device 71 comprises cylindrical tube portion 71a and conical tube portion 71b, and described cylindrical tube portion 71a and conical tube portion 71b inside is provided with the elongated hole 711 coordinated with guide pipe 4.
Advantage of the present invention is: 1, the pressurized air flow pipe of this nozzle and aqueous solution of urea flow pipe completely independent, and the outlet section pipeline of pressurized air and aqueous solution of urea and guide section pipeline are at an angle of 90, pressurized air and aqueous solution of urea mix at nozzle exterior, make the injection direction of nozzle in exhaust pipe consistent with the discharge directions of diesel engine vent gas, substantially increase the mixed effect of NOx in aqueous solution of urea and tail gas, and atomizing effect is also fine; 2, the aqueous solution of urea of this nozzle is directly from the ejection of outlet section urea tube, and outlet diameter is comparatively large, is different from market and adopts hole array to spray the design of urea, therefore not easily blocked by the impurity in urea, reduce the rate of fault of nozzle; 3, the Placement of this nozzle and exhaust pipe is Placement general at present, and structure is simple, and be easy to operation, soundness is high.
In nozzle using process of the present invention, the NOx mixed effect in aqueous solution of urea and diesel engine vent gas is splendid, and actual atomizing effect is remarkable, can significantly improve the transformation efficiency of NOx; Nozzle exit should not block, and Nozzle failures rate is low.
Accompanying drawing explanation
Fig. 1 is the stereogram of the present invention for the SCR system of diesel engine nozzle of air supplementary mode.
Fig. 2-a is the structural drawing of the present invention for the SCR system of diesel engine nozzle of air supplementary mode, wherein, 1 is the initial segment air duct, 2 is the initial segment urea tube, 3 is ozzle fitting seat, 4 is guide pipe, 5 is outlet section air duct, 6 outlet section urea tubes, 7 nozzle installation group covers, 11 is air inlet port, 12 is air duct joint, 13 is the first air collecting chamber, 21 is feed liquor duct, 22 is urea tube joint, 23 is the first liquid collecting cavity, 34 is the first air passageways (also referred to as the first air guide channel), 35 is the first urea passage (also referred to as the first urea guide channel), 41 is the second air passageways (also referred to as the second air guide channel), 42 is the second urea passage (also referred to as the second urea guide channel), 43 is guide pipe top gap, 44 is the projection of guide pipe 4, 51 is the second air collecting chamber, 61 is the second liquid collecting cavity.
Fig. 2-b is the partial enlarged drawing bottom Fig. 2-a, wherein, 52 is the air interface communicated with the second air passageways 41,53 is compressed air outlet, 541 is that first of outlet section air duct locates chimb, 531 is the exterior edge face in outlet section air pipe outlets portion, and 62 is aqueous solution of urea outlet passage, and 621 is the exterior edge face of outlet section urea tube export department.
Fig. 3 is the sectional view of ozzle fitting seat 3 in the embodiment of the present invention 1.Wherein, 3a is end face, 3b is bottom surface, and 31 is the first groove, and 32 is the second groove, 33 is the 3rd groove, 34 is the first air guide channel, and 35 is the first urea guide channel, and 321 is the conical surface to the convergence of circular hole axle center, 331 is the plane coordinated with guide section pipeline 4, and 332 for preventing the positioning groove of guide section pipeline 4 loading error.
Fig. 4-a is the sectional view of guide pipe 4 in the embodiment of the present invention 1.Wherein, 4A and 4B is top and bottom, 41 is the second air guide channel, 42 second urea guide channels, 43 is guide pipe top gap, and 44 is the projection of guide pipe 4, and 46 is urea outer pipe mounting groove, 461 is the inner cylindrical surface coordinated with urea outer pipe 6, and 462 is the locating face coordinated with urea outer pipe 6.
Fig. 4-b is the C-C sectional view of guide pipe 4 in the embodiment of the present invention 1.Wherein, 45 is air outlet slit pipe mounting groove, and 451,452 be the orthogonal plane, 453 coordinated with air outlet slit pipe 5 is the locating slot coordinated with air outlet slit pipe 5.
Fig. 5-a is the sectional view of the embodiment of the present invention 1 middle outlet section air duct 5.Wherein, wherein, 51 is the second air collecting chamber, and 52 is the air interface be communicated with the second air passageways 41, and 53 is compressed air outlet, and 531 is the export department exterior edge face of air outlet slit pipe, and 54 is the first attachment face, and 55 is the second attachment face, and 551 is the second location chimb.
Fig. 5-b is the plan view of the embodiment of the present invention 1 middle outlet section air duct 5.Wherein, 541 is the first location chimb.
Fig. 6 is the sectional view of the embodiment of the present invention 1 middle outlet section urea tube 6.Wherein, 61 is the second liquid collecting cavity, and 62 is aqueous solution of urea outlet passage, and 621 is the export department exterior edge face of urea outer pipe, and 63 is conical pipe portion, and 611 is locating face, and 612 is external cylindrical surface, and 64 is the first cylindrical tube portion, and 65 is the second cylindrical tube portion.
Fig. 7-a is the sectional view of positioning device 72 in nozzle installation group cover 7 in the embodiment of the present invention 1, and wherein, 72 is positioning device, and 721 is interior step circular hole, and 722 is outer step circular hole, and 73 is the locator protrusions for being installed to by nozzle on exhaust pipe.
Fig. 7-b is the sectional view of clamp device 71 in nozzle installation group cover 7 in the embodiment of the present invention 1, and wherein, 71 is clamp device, and 71a is cylindrical tube portion, and 71b is conical pipe portion, and 711 is elongated hole.
Fig. 8-a is the stereogram of nozzle described in comparative example 1, and Fig. 8-b is sectional view, and wherein, 81 is air duct, and 82 is urea tube, and 83 is spray orifice.
Fig. 9 is the sectional view of nozzle described in comparative example 2, and wherein, 91 is air duct, and 92 is urea tube, and 93 is triangular mounting seat.
Embodiment
The invention provides a kind of diesel SCR nozzle for air supplementary mode, comprise pressurized air flow pipe and aqueous solution of urea flow pipe, pressurized air flow pipe and aqueous solution of urea flow pipe completely independent, and the outlet section pipeline of pressurized air and aqueous solution of urea and guide section pipeline are at an angle of 90, pressurized air and aqueous solution of urea mix at nozzle exterior, make the injection direction of nozzle in exhaust pipe consistent with the discharge directions of diesel engine vent gas, substantially increase the mixed effect of aqueous solution of urea and tail gas NOx, described nozzle comprises the initial segment air duct 1, the initial segment urea tube 2, ozzle fitting seat 3, guide section pipeline 4 and outlet section air duct 5 and outlet section urea tube 6, the initial segment air duct 1 and the initial segment urea tube 2 are arranged on ozzle fitting seat 3, guide section pipeline 4 is arranged on ozzle fitting seat 3, outlet section air duct 5 and outlet section urea tube 6 are arranged on guide section pipeline 4, the guide channel 41 and 42 of pressurized air and urea liquid is independently arranged in guide section pipeline 4 inside.
Outlet section pipeline of the present invention and guide section pipeline are installed at an angle of 90, and pressurized air mixes at nozzle exterior with aqueous solution of urea.
In a preferred embodiment, the invention provides a kind of diesel SCR nozzle, it is characterized in that, comprise pressurized air flow pipe and aqueous solution of urea flow pipe, pressurized air flow pipe and aqueous solution of urea flow pipe completely independent, and the outlet section pipeline of pressurized air and aqueous solution of urea and guide section pipeline are at an angle of 90, pressurized air and aqueous solution of urea mix at nozzle exterior, described nozzle comprises the initial segment air duct 1, the initial segment urea tube 2, intermediate section pipeline ozzle fitting seat 3, guide section pipeline 4 and outlet section air duct 5 and outlet section urea hang 6, and guide section channel interior has two independent pipelines to be respectively used to the second air guide channel 41 and the second aqueous solution of urea guide channel 42.
Wherein, described ozzle fitting seat 3 comprises the first groove 31, second groove 32, the 3rd groove 33, first air guide channel 34 and the first urea guide channel 35, and described the initial segment air duct 1 and the initial segment urea tube 2 form the first air collecting chamber 13 and the first liquid collecting cavity 23 with the first groove 31 of ozzle fitting seat 3 and the second groove 32 respectively.
Wherein, described 3rd groove 33 comprises the plane 331 coordinated with guide section pipeline 4, prevents the positioning groove 332 of guide section pipeline 4 loading error, and described 3rd groove 33 communicates with the first air guide channel 34.
Described guide section pipeline 4 inside is provided with the second air guide channel 41 and the second urea guide channel 42, and the upper end of guide section pipeline is 4A, and lower end is 4B.
The 4A end of described guide section pipeline 4 comprises the gap 43 be communicated with aforementioned first air guide channel 34 by the second air guide channel 41, there is the cylindrical projections 44 preventing guide section pipeline 4 from assembling dislocation the outside of the second urea guide channel 42 side, and projection 44 matches with described positioning groove 332.
The 4B end of described guide section pipeline 4 comprises the air outlet slit pipe mounting groove 45 of outlet section air duct 5 and the urea outer pipe mounting groove 46 of outlet section urea tube 6.
Wherein, described air outlet slit pipe mounting groove 45 comprises and the plane 451 that outlet section air duct 5 coordinates, the plane 452 vertical with plane 451 and locating slot 453.Described urea outer pipe mounting groove 46 comprises the inner cylindrical surface 461 and plane of orientation 462 that coordinate with outlet section urea tube 6.
Wherein, described outlet section air duct 5 comprises the second air collecting chamber 51, the air interface 52 be communicated with the second air guide pipe 41 in guide section pipeline 4, compressed air outlet 53, the first attachment face 54, second attachment face 55, first of coordinating with above-mentioned air outlet slit pipe mounting groove 45 locate chimb 541 and second and locate chimb 551.
Described outlet section urea tube 6 comprises the second liquid collecting cavity 61, cylindrical tube portion 65 of aqueous solution of urea outlet passage 62, first cylindrical tube portion 64, second, conical pipe portion 63, the location and installation face 611 coordinated with described urea outer pipe mounting groove 46 and external cylindrical surface 612.
First attachment face 54 of described outlet section air duct 5 matches with the plane 451 of the air outlet slit pipe mounting groove 45 of described guide section pipeline 4, and the second attachment face 55 coordinates with plane 452, and location chimb 551 coordinates with locating slot 453, forms location and installs.
The location and installation face 611 of described outlet section urea tube 6 coordinates with the plane of orientation 462 of the urea outer pipe mounting groove 46 of guide section pipeline 4, and external cylindrical surface 612 coordinates with inner cylindrical surface 461, forms location and installs.
Described guide section pipeline 4 and outlet section air duct 5 and outlet section urea tube 6 is in 90 ° coordinates, make the injection direction of nozzle in exhaust pipe consistent with the discharge directions of diesel engine vent gas, substantially increase the mixed effect of NOx in aqueous solution of urea and tail gas.
The outlet 53 of described outlet section air duct 5 is a little less than the outlet passage 62 of outlet section urea tube 6, and form the second air collecting chamber 51 (that is, the external diameter in the second cylindrical tube portion 65 of described aqueous solution of urea outer pipe 6 is slightly less than the internal diameter of compressed air outlet 53).
Wherein, above-mentioned diesel SCR nozzle also comprises exhaust pipe installation group cover 7, described installation group cover comprises lower end surface 71, upper-end surface 72, be positioned at lower end surface 71 has coordinate with guide section pipeline 4 elongated hole 711, be positioned on upper-end surface 72 and have the elongated hole 721 coordinated with guide section pipeline 4 and the locator protrusions 73 be installed to by nozzle on exhaust pipe.
Below in conjunction with drawings and Examples, diesel engine selective catalytic reduction system operating nozzle of the present invention and Advantageous Effects thereof are described in detail.
Embodiment 1
In a kind of preferred embodiment of the present invention, described diesel engine selective catalytic reduction system operating nozzle comprises following structure:
The initial segment air duct 1: include columniform air inlet port 11, bottom is provided with for carrying out the air duct joint 12 of step location with ozzle fitting seat 3, and described air duct 1 forms the first air collecting chamber 13 with the first groove 31 of following ozzle fitting seat 3.
The initial segment urea tube 2: include cylindrical feed liquor duct 21, bottom is provided with for carrying out the joint 22 of step location with ozzle fitting seat 3, and described urea tube 2 forms the first liquid collecting cavity 23 with the conical surface of following ozzle fitting seat 3 second groove 32.
Preferably, described the initial segment air duct 1 and the initial segment urea tube 2 meet SAE J2044-2002 standard, in actual use can using the initial segment air duct 1 and the initial segment urea tube 2 as male connector, connector, as negative joint, realizes the quick-replaceable on external connecting pipe road.
Ozzle fitting seat 3: as shown in Figure 3,3a and 3b is respectively end face and the bottom surface of ozzle fitting seat 3, described ozzle fitting seat 3 comprises the first groove 31 for locating with the initial segment air duct 1 step, for carrying out the second groove 32 of step location with the initial segment urea tube 2, and be provided with the 3rd groove 33 coordinated with guide pipe 4 in bottom.Preferably, described first groove 31 and the second groove 32 are arranged along the Central Symmetry of ozzle fitting seat 3.
Wherein, described first groove 31 top is provided with the stepped recesses for locating with the initial segment air duct 1 step, and bottom is being horizontally arranged with near side, ozzle fitting seat center the first air passageways 34 be connected with the 3rd groove 33.
Wherein, described second groove 32 top is provided with the stepped recesses for locating with the initial segment urea tube 2 step, bottom is provided with the conical surface 321 to the convergence of its circular hole axle center, the cylindrical bore be connected with the 3rd groove 33 is set bottom the conical surface 321, i.e. the first urea passage 35, the inner chamber of described second groove 32 and the end face 3a of the through ozzle fitting seat of the first urea passage 35 and the 3rd groove 33, and communicate with the second urea passage 42 of following guide pipe 4.
Wherein, described 3rd groove 33 comprises the cylinder shape groove for coordinating with following guide section pipeline 4, be provided with the positioning groove 332 preventing pilot conduits 4 from assembling dislocation near side, fitting seat edge at cylinder shape groove, described cylinder shape groove comprises the groove plane 331 for locating with following guide section pipeline 4 periphery, and in described 3rd groove 33, the size of cylinder shape groove is equal with the periphery of following guide section pipeline 4.
The guide pipe 4 of guide section: as shown in Fig. 4-a and 4-b, 4A and 4B is respectively top and the bottom of guide pipe, described guide pipe inside is provided with independently two ducts parallel to each other, and be respectively the second air passageways 41 and the second urea passage 42, guide pipe 4 low side is not run through in described two ducts.
Described guide pipe top is cut from the outer ledge near the second air passageways 41 and is formed right angle gap 43, in order to be communicated with the second air passageways 41 and the first air passageways 34; Described guide pipe bottom forms right angle gap from the edge slit near the second air passageways 41, form compressed air outlet pipeline mounting groove 45, described second air passageways 41 is made to run through the end face 451 of guide pipe top 4A and compressed air outlet pipe mounting groove 45, the side 452 of described compressed air outlet pipe mounting groove 45 is parallel with the second urea passage 42, but does not communicate with the second urea passage 42; Cut from compressed air outlet pipe side 452 bottom guide pipe 4 and form right angle locating slot 453, and described locating slot 453 does not communicate with the second urea passage 42.The end face 451 of described compressed air outlet pipe mounting groove 45, side 452 match with the first attachment face 54 of following outlet section air duct 5 and the second attachment face 55 respectively, and locating slot 453 is located chimb 551 with second of outlet section air duct 5 and matched.
Described guide pipe top is provided with at the outward edge near the second urea passage 42 projection 44 preventing guide section pipeline 4 loading error, the wrong-mounting prevention groove 332 that described projection 44 and ozzle install 3 matches, described second urea passage 42 bottom is provided with the arc groove being less than 1/2 circumference of connection second urea passage 42 and air outlet slit pipe mounting groove 45 side 452, i.e. aqueous solution of urea outer pipe mounting groove 46, described arc groove groove face is lower than the bottom of the second urea passage 42, arc groove comprises inner cylindrical surface 461 and the locating face 462 with guide pipe parallel to an axis, the inner cylindrical surface 461 of described aqueous solution of urea mounting groove 46 matches with the external cylindrical surface 612 of following outlet section urea tube 6, locating face 462 matches with the locating face 611 of urea outer pipe 6.
When guide pipe 4 coordinates with following outlet section air duct 5 and outlet section urea tube 6, the air interface 52 of following outlet section air duct 5 is connected with the second air passageways 41, and the second liquid collecting cavity 61 of outlet section urea tube 6 is connected with the second urea passage 42.First location chimb 541 of air outlet slit pipe matches with the outer circumferential face of guide pipe 4.
Outlet section air duct 5: as shown in Fig. 5-a and 5-b, described outlet section air duct 5 is the U-shaped seal structure of inner hollow, comprise the first attachment face 54 and second attachment face 55 vertical with the first attachment face 54, described first attachment face 54 is provided with the air interface 52 be connected with the second air passageways 41 and match with guide pipe 4 outer circumferential face first locates chimb 541; The second positioning convex 551 for coordinating with guide pipe 4 locating slot 453 is provided with bottom described second attachment face 55; The side opposed with the second attachment face is provided with the air outlet slit 53 be communicated with hollow space.When outlet section urea tube 6, outlet section air duct 5 and guide pipe 4 coordinate, the outer surface of following outlet section urea tube 6 and the internal surface of outlet section air duct 5 form the second air collecting chamber 51.
Outlet section urea tube 6: as shown in Figure 6, the second cylindrical tube portion 65 that described outlet section urea tube 6 comprises the first cylindrical tube portion 64, diameter is less than the first cylindrical tube portion and the conical pipe portion 63 in order to be connected the first cylindrical tube portion and the second cylindrical tube portion; Described first cylindrical tube portion comprises the locating face 611 for matching with aqueous solution of urea mounting groove 46 locating face 462, and the external cylindrical surface 612 for connecting with the inner cylindrical surface 461 of aqueous solution of urea mounting groove 46; The inner chamber in described first cylindrical tube portion and conical pipe portion forms the second liquid collecting cavity 61; Described second inside, cylindrical tube portion 65 is provided with aqueous solution of urea outlet passage 62.The external diameter in described second cylindrical tube portion is slightly less than the internal diameter of the air outlet slit 53 of outlet section air duct, when outlet section urea tube 6, outlet section air duct 5 and guide pipe 4 coordinate, as shown in Fig. 2-b, described second cylindrical tube portion 65 inserts the air outlet slit 53 of outlet section air duct 5, and air outlet slit 53 exterior edge face 531 is a little less than the exterior edge face 621 of the outlet passage 62 of outlet section urea tube, form the second air collecting chamber 51.
Nozzle installation group cover 7: described nozzle installation group cover comprises positioning device 72 and clamp device 71, described positioning device 72 inside is provided with the step circular hole running through end face and bottom surface, described step circular hole comprise to coordinate with guide pipe 4 periphery in step circular hole 721 and the outer step circular hole 722 that coordinates with clamp device; Described positioning device outer circumferential face is provided with the locator protrusions 73 for being installed to by nozzle on exhaust pipe.Described clamp device comprises cylindrical tube portion 71a and conical tube portion 71b, and described cylindrical tube portion and inside, conical tube portion are provided with the elongated hole 711 coordinated with guide pipe 4.
The heat-resistance stainless steel that in the present invention, the whole parts of nozzle all adopt resistant to urea to corrode.
Specifically, diesel SCR nozzle of the present invention, its each component assembling process is as follows:
(1) joint 12 of the initial segment air duct 1 is connected with ozzle fitting seat 3 with the joint 22 of the initial segment urea tube 2, employing step is located, ensure that outer length is consistent, coordinate with the first groove 31 of ozzle fitting seat 3 and the second groove 32 respectively by the initial segment air duct 1 described in embodiment 1 and the initial segment urea tube 2, described the initial segment air duct 1 and the first groove 31 locate rear formation first air collecting chamber 13, and the conical surface of described the initial segment urea tube 2 and the second groove 32 is located and formed the first liquid collecting cavity 23 afterwards.
(2) guide section pipeline 4 is connected with ozzle fitting seat 3, use outer circumferential face is located, adopt draw-in groove 332 to match with projection 44 and prevent from filling by mistake, match by the internal surface of the outer circumferential face of guide pipe 4 described in embodiment 1 with the 3rd groove 33 of ozzle fitting seat 3, the 4A end of guide section pipeline 4 connects with the plane 331 of ozzle fitting seat 3, the projection 44 of guide pipe 4 matches with the positioning groove 332 of ozzle fitting seat 3, ensures that the gap 43 on guide pipe 4 top communicates with the first air passageways 34.
(3) in order to improve the mixed effect of urea and NOx, the outlet section air duct 5 of nozzle and outlet section urea tube 6 are connected with guide pipe 4 is in 90 °.
(4) for ensureing nozzle exit, the outlet port of air outlet slit pipe 5 and urea outer pipe 6 is concentric, second attachment face 55 of air outlet slit pipe 5 connects with the mounting plane 452 of guide section pipeline 4, second location chimb 551 of air outlet slit pipe 5 matches with the locating slot 453 of guide pipe 4, complete location, ensure that the air interface 52 of air outlet slit pipe 5 communicates with the second air passageways 41 simultaneously.
(5) for ensureing nozzle exit, the outlet port of outlet section air duct 5 and outlet section urea tube 6 is concentric, the locating face 611 of outlet section urea tube 6, connect with the locating face 462 of guide pipe 4 urea outer pipe mounting groove 46, the external cylindrical surface 612 of outlet section urea tube 6 matches with the inner cylindrical surface 461 of guide pipe 4 urea outer pipe mounting groove 46, completes location.Thus ensure that the air outlet slit 53 of outlet section air duct 5 is consistent with the axle center of the outlet passage 62 of outlet section urea tube 6, and the outlet exterior edge face 621 of outlet section urea tube 6 is a little more than the exterior edge face 531 of the export department of outlet section air duct 5, namely, after installation, the outlet exterior edge face 621 of outlet section urea tube 6 exceeds the exterior edge face 531 of the export department of outlet section air duct 5.
(4) outer circumferential face of guide section pipeline 4 matches with the elongated hole 711 of clamp device 71 inside of nozzle installation group cover 7 and the interior step circular hole 721 of positioning device 72, the outer circumferential face of clamp device 71 matches with the outer step circular hole 722 of positioning device 72, forms the diesel SCR nozzle in the present invention.
So far, air inlet port 11, first air collecting chamber 13, first air passageways 34, second air passageways 41 of air duct and the second air collecting chamber 51 form air passageways; The feed liquor duct 21 of urea tube, liquid collecting cavity 23, first urea passage 35, second urea passage 42 and the second liquid collecting cavity 61 form aqueous solution of urea passage.
Pressurized air, through the outlet section air duct 5 at initial air duct 1, intermediate section pipeline ozzle connecting base 3, guide section pipeline 4 and delivery nozzle place, forms pressurized air flow pipe; Aqueous solution of urea, through initial pipeline urea tube 2, intermediate section pipeline ozzle connecting base 3, guide section pipeline 4 and outlet section urea tube 6, forms aqueous solution of urea pipeline; And pressurized air and aqueous solution of urea mix in the outside of outlet section air duct 5 and outlet section urea tube 6.
Nozzle and diesel catalyst are oxidized the tail gas exhaust pipe before case and are connected, the nut check mounting type that logical employing is general at present, and nozzle installation direction is vertical with airflow direction, and jet expansion ensures consistent with airflow direction.
Preferably, described the initial segment air duct 1 and the initial segment urea tube 2 meet SAE J2044-2002 standard, and rapid pipe joint can be adopted to change.
Comparative example 1
The stereogram of existing a kind of diesel engine selective catalytic reduction system operating nozzle as shown in fig 8-a, sectional view is as shown in 8-b, pressurized air and aqueous solution of urea 81,82 enter nozzle interior respectively by the road, aperture 83 through jet expansion portion after mixing sprays, by adjusting the diameter of this aperture, direction, quantity and position, adjustment atomizing effect.The difficulty of processing of this aperture is high, causes processing cost to improve, and occurs that small holes is by the phenomenon of the impurity blocking in urea.
Comparative example 2
Comparative example 2, as shown in Figure 9, pressurized air and aqueous solution of urea 91,92 enter nozzle interior respectively by the road, and through respective standalone media passage, directly from nozzle ejection, pressurized air mixes in outlet port with aqueous solution of urea.This nozzle is installed need by illustrated triangular mounting seat 93, adopts screw to be installed on exhaust pipe, and the urea-spray direction after installing generally is 45 degree with the airflow direction of tail gas, is unfavorable for jet atomization.
Pressurized air flow pipe of the present invention and aqueous solution of urea flow pipe completely independent, and the outlet section pipeline of pressurized air and aqueous solution of urea and guide section pipeline are at an angle of 90, pressurized air and aqueous solution of urea mix at nozzle exterior, make the injection direction of nozzle in exhaust pipe consistent with the discharge directions of diesel engine vent gas, substantially increase the mixed effect of NOx in aqueous solution of urea and tail gas, and atomizing effect is also fine;
Aqueous solution of urea of the present invention is directly from the ejection of outlet section urea tube, and outlet diameter is comparatively large, and processing cost is low, is different from market and adopts hole array to spray the design of urea, therefore not easily blocked by the impurity in urea, reduce the rate of fault of nozzle;
The Placement of the present invention and exhaust pipe is Placement general at present, and structure is simple, and be easy to operation, soundness is high.
It can thus be appreciated that, diesel engine selective catalytic reduction system operating nozzle of the present invention can improve the mixed effect of the NOx in aqueous solution of urea and diesel engine vent gas, can significantly improve the transformation efficiency of NOx, and jet expansion should not block, Nozzle failures rate is low, has broad application prospects.
Claims (17)
1. a diesel engine selective catalytic reduction system operating nozzle, it is characterized in that, comprise pressurized air flow pipe and aqueous solution of urea flow pipe, described pressurized air flow pipe comprises the initial segment air duct (1), intermediate section first air collecting chamber (13) and the first air passageways (34), guide section second air passageways (41), with outlet section air duct (5), described aqueous solution of urea flow pipe comprises the initial segment urea tube (2), intermediate section first liquid collecting cavity (23) and the first urea passage (35), guide section second urea passage (42), with outlet section urea tube (6), described outlet section air duct (5) is vertical with guide section second air passageways (41) to be arranged, and described outlet section urea tube (6) is vertical with guide section second urea passage (42) to be arranged.
2. nozzle according to claim 1, wherein, the device of described intermediate section is ozzle fitting seat (3), and the device of described guide section is guide pipe (4);
Wherein, described ozzle fitting seat (3) is top (3a) near one end of air duct (1) and urea tube (2), and the other end is bottom (3b), top (3a) be provided with for the initial segment air duct (1) carry out step location the first groove (31) and for carrying out second groove (32) of step location with the initial segment urea tube (2), bottom (3b) is provided with the 3rd groove (33) for coordinating with guide pipe (4), wherein, described second groove bottom is provided with the conical surface (321) to the convergence of its circular hole axle center, described the initial segment air duct (1) and the initial segment urea tube (2) form the first air collecting chamber (13) and the first liquid collecting cavity (23) with the conical surface (321) of the first groove (31) and the second groove (32) respectively.
3. nozzle according to claim 2, wherein, described first groove (31) bottom is being provided with near side, ozzle fitting seat center the first air passageways (34) be communicated with the 3rd groove (33).
4. the nozzle according to Claims 2 or 3, wherein, the conical surface (321) bottom of described second groove (32) is provided with the first urea passage (35) be communicated with the 3rd groove (33).
5. the nozzle according to any one of claim 2-4, wherein, described 3rd groove (33) depart from side, ozzle fitting seat center be provided with prevent guide pipe (4) assemble dislocation positioning groove (332).
6. nozzle according to claim 2, wherein, described guide pipe (4) is inner is axially provided be parallel to each other independently the second air passageways (41) and the second urea passage (42), described guide pipe (4) is top (4A) near one end of ozzle fitting seat (3), the other end is bottom (4B), and the top (4A) of guide pipe (4) is provided with the gap (43) for being communicated with the second air passageways (41) and the first air passageways (34).
7. nozzle according to claim 6, is provided with the projection (44) preventing guide pipe (4) from assembling dislocation in top (4A) periphery of guide pipe (4).
8. the nozzle according to claim 6 or 7, wherein, described guide pipe (4) is provided with the compressed air outlet pipe mounting groove (45) of right angle type at bottom (4B), described air outlet slit pipe mounting groove (45) comprises and the end face (451) that the second air passageways (41) communicates and the side (452) parallel with the second urea passage (42), and described guide pipe (4) cuts formation right angle locating slot (453) at bottom (4B) from the side (452) of mounting groove (45).
9. the nozzle according to any one of claim 6-8, wherein, described second urea passage (42) bottom is provided with urea outer pipe mounting groove (46), the arc groove that described urea outer pipe mounting groove (46) is connection second urea passage (42) and air outlet slit pipe mounting groove (5) side (452), comprise inner cylindrical surface (461) and the locating face (462) along guide pipe (4) axis, described inner cylindrical surface (461) is lower than the bottom of the second urea passage (42).
10. the nozzle according to any one of claim 1-9, wherein, the U-shaped seal structure that described outlet section air duct (5) is inner hollow, comprise the first attachment face (54) for matching with air outlet manifold mounting groove (45) end face (451) and the second attachment face (55) perpendicular to the first attachment face (54), described first attachment face (54) is provided with the air interface (52) be communicated with the second air passageways (41) and match with guide pipe (4) outer circumferential face first locates chimb (541).
11. nozzles according to claim 10, wherein, described second attachment face (55) is matched with air outlet manifold mounting groove (45) side (452), and described second attachment face (55) is provided with second locates chimb (551) for what coordinate with locating slot (453).
12. nozzles according to claim 10 or 11, wherein, described outlet section air duct (5) is being provided with the one side that the second attachment face (55) opposes the air outlet slit (53) be communicated with hollow space.
13. nozzles according to any one of claim 1-12, wherein, described outlet section urea tube (6) comprises the first cylindrical tube portion (64), diameter is less than the second cylindrical tube portion (65) in the first cylindrical tube portion (64), with the conical pipe portion (63) in order to be connected the first cylindrical tube portion (64) and the second cylindrical tube portion (65), described first cylindrical tube portion (64) comprises the locating face (611) for connecting with aqueous solution of urea pipe mounting groove (46) locating face (462) and the external cylindrical surface (612) for connecting with aqueous solution of urea pipe mounting groove (46) inner cylindrical surface (461), the inner chamber of described first cylindrical tube portion (64) and conical pipe portion (63) forms the second liquid collecting cavity (61).
14. nozzles according to claim 13, wherein, described second cylindrical tube portion (65) inside is provided with aqueous solution of urea outlet passage (62), described second cylindrical tube portion (65) external diameter is slightly less than the internal diameter of the air outlet slit (53) of outlet section air duct (5), after outlet section urea tube (6), outlet section air duct (5) and guide pipe (4) coordinate, the outer surface of described outlet section urea tube (6) and the internal surface of outlet section air duct (5) form the second air collecting chamber (51).
15. nozzles according to claim 1-14, wherein, described nozzle also comprises nozzle installation group cover (7), and described nozzle installation group cover (7) comprises positioning device (72) and clamp device (71);
Wherein, described positioning device (72) inside is provided with the step circular hole running through end face and bottom surface, and described step circular hole comprises the interior step circular hole (721) coordinated with guide pipe (4) outer circumferential face and the outer step circular hole (722) coordinated with clamp device (71).
16. nozzles according to claim 15, wherein, described positioning device (72) outer circumferential face be provided with for by nozzle the location be installed on exhaust pipe rise (73).
17. nozzles according to claim 15 or 16, wherein, described clamp device (71) comprises cylindrical tube portion (71a) and conical tube portion (71b), and described cylindrical tube portion (71a) and conical tube portion (71b) inside are provided with the elongated hole (711) coordinated with guide pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510164923.5A CN104912632A (en) | 2015-05-08 | 2015-05-08 | Diesel engine selective catalytic reduction system nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510164923.5A CN104912632A (en) | 2015-05-08 | 2015-05-08 | Diesel engine selective catalytic reduction system nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN104912632A true CN104912632A (en) | 2015-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510164923.5A Pending CN104912632A (en) | 2015-05-08 | 2015-05-08 | Diesel engine selective catalytic reduction system nozzle |
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| CN (1) | CN104912632A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107376621A (en) * | 2017-08-15 | 2017-11-24 | 深圳市特种设备安全检验研究院 | Denitrogenation method and system in biomass Industrial Boiler stove |
| CN111188671A (en) * | 2018-11-15 | 2020-05-22 | 卡特彼勒公司 | Reductant nozzle with radial air injection |
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| CN203347897U (en) * | 2013-06-18 | 2013-12-18 | 潍柴动力股份有限公司 | SCR urea nozzle |
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| CN104583548A (en) * | 2012-06-21 | 2015-04-29 | 洋马株式会社 | Urea solution injection nozzle |
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| JP2007040118A (en) * | 2005-08-01 | 2007-02-15 | Osaka Gas Co Ltd | Aqueous urea nozzle device |
| CN101518766A (en) * | 2008-10-16 | 2009-09-02 | 阿尔博耐尔有限公司 | Dual-medium nozzle |
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| CN107376621A (en) * | 2017-08-15 | 2017-11-24 | 深圳市特种设备安全检验研究院 | Denitrogenation method and system in biomass Industrial Boiler stove |
| CN111188671A (en) * | 2018-11-15 | 2020-05-22 | 卡特彼勒公司 | Reductant nozzle with radial air injection |
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Application publication date: 20150916 |