CN203756290U - Urea water solution injection system used for SCR (Selective Catalytic Reduction) postprocessing system - Google Patents
Urea water solution injection system used for SCR (Selective Catalytic Reduction) postprocessing system Download PDFInfo
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- CN203756290U CN203756290U CN201320792355.XU CN201320792355U CN203756290U CN 203756290 U CN203756290 U CN 203756290U CN 201320792355 U CN201320792355 U CN 201320792355U CN 203756290 U CN203756290 U CN 203756290U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The utility model discloses a urea water solution injection system used for an SCR (Selective Catalytic Reduction) postprocessing system. The injection system comprises a urea bucket (1), a diaphragm pump (2), an overflow balance valve (3) and an ejector (4), wherein the diaphragm pump (2) is communicated with the urea bucket (1) by a first pipeline (12); the overflow balance valve (3) is communicated with the diaphragm pump (2) by a second pipeline (13); the ejector (4) is communicated with the overflow balance valve (3) by a third pipeline (14); the ejector (4) is arranged at a position close to an exhaust pipe (10) and is communicated with the exhaust pipe (10); the overflow balance valve (3) is communicated with the urea bucket (1) by a fourth pipeline (15); the overflow balance valve (3) is communicated with the ejector (4) by a fifth pipeline (16). According to the injection system, the pressure difference between urea water solution and compressed air is kept unchanged by the control of the overflow balance valve, the flow velocity of urea fogdrops which are ejected by the ejector is further kept unchanged, and the precise metering and the accuracy control on the urea water solution to be ejected are realized by the own starting frequency and the duty ratio of the ejector.
Description
Technical field
The utility model relates to Purification of IC Exhaustive Gas processing technology field, particularly a kind of ejecting system of the aqueous solution of urea for selective catalytic reduction (SCR) after-treatment system.
Background technique
In prior art, internal-combustion engine especially contains a large amount of particulate matter (PM, Particulate Matter) and nitrogen oxide in the exhaust of diesel engine, and atmosphere environment is caused to severe contamination.This does not meet existing and from now on by the regulation of the environmental protection relevant laws and regulations of promulgating.
In prior art, there is a shortcoming for the method for I. C. engine exhaust processing, cannot realize the purified treatment of PM and nitrogen oxide simultaneously, conflict mutually between the two.For example, adopt EGR (EGR, Exhaust Gas Recycle) technology purified treatment I. C. engine exhaust, the content that can realize nox in exhaust significantly reduces, but in exhaust, the content of PM raises on the contrary, and fuel cost improves; Adopt high-pressure injection technology purified treatment I. C. engine exhaust, be conducive to reduce the content of PM in exhaust, but tend to make the content of nox in exhaust to raise.
In recent years, technician starts again to pay close attention to diesel engine homogeneous charge compression ignite (HCCI, HomogeneousCharge Compression Ignition) technology, wish to reduce the content of PM and nitrogen oxide in internal-combustion engine simultaneously, but the applicable condition range of HCCI technology is limited, engine mode switching controls complexity, and reduce the DeGrain of PM and amount of nitrogen oxides in exhaust.
Along with the enhancing of the mankind to atmosphere protection consciousness, the environmental protection relevant laws and regulations of promulgating successively both at home and abroad are progressively tending towards severization.To this, technician has to adopt post-processing technology to carry out the exhaust of purified treatment internal combustion.
The basic principle of SCR post-processing technology is to injected fuel in I. C. engine exhaust or adds in addition reducing agent, utilizes suitable catalyzer to impel reducing agent and nitrogen oxide generation chemical reaction to generate nitrogen (N
2), suppress the non-selective oxidation reaction of reducing agent and oxygen simultaneously.For example,, with ammonia (NH
3) be that the SCR post-processing technology of reducing agent is processed when exhaust, the main chemical reactions of generation is as follows:
4NH
3+4NO+O
2→4N
2+6H
2O；
2NH
3+NO+NO
2→2N
2+3H
2O；
8NH
3+6NO
2→7N
2+12H
2O；
2NO
2+2NH
3→NH
4NO
3+N
2+H
2O。
Because ammonia has higher corrosivity, the storage of liquefied ammonia and ammoniacal liquor and transport are all very difficult, thereby ammonia can not be directly used in vehicle-mounted SCR after-treatment system.
Above-mentioned defect for ammonia as reducing agent, technician adopts aqueous solution of urea that reducing agent is provided conventionally.Practice shows, the aqueous solution of urea that concentration is 32.5% has minimum solidifying point, and its solidifying point is-11 DEG C, thus generally adopt in the world aqueous solution of urea that concentration is 32.5% that the reducing agent of SCR post-processing technology is provided, and by its called after AdBlue.
Adopt SCR post-processing technology purified treatment I. C. engine exhaust, if adopt aqueous solution of urea that reducing agent is provided, aqueous solution of urea need to be sprayed to exhaust.When spraying aqueous solution of urea in exhaust, need to consider the factors such as concentration, the working condition of catalyzer and the leakage rate of ammonia of nitrogen oxide.Particularly, need accurately to control the requirement of the emitted dose of aqueous solution of urea when spraying aqueous solution of urea in exhaust, the highest 25ppm of being no more than of leakage rate making at ammonia, be on average no more than under the condition of 10ppm, the transformation efficiency of nitrogen oxide is the highest.Therefore,, concerning SCR post-processing technology, how to realize the accurate measurement of aqueous solution of urea and accurately control and become technician's technical problem urgently to be resolved hurrily.
Model utility content
The purpose of this utility model is the above-mentioned defect for prior art, and a kind of ejecting system of the aqueous solution of urea for SCR after-treatment system is provided.
The ejecting system of the aqueous solution of urea for SCR after-treatment system that the utility model provides comprises urea bucket, diaphragm pump, overflow equilibrium valve and sparger;
Described diaphragm pump is communicated with described urea bucket by the first pipeline; Described overflow equilibrium valve is communicated with described diaphragm pump by the second pipeline; Described sparger is communicated with described overflow equilibrium valve by the 3rd pipeline; Described sparger is located near outlet pipe place, and described sparger is connected with outlet pipe; Described overflow equilibrium valve is communicated with described urea bucket by the 4th pipeline; Described overflow equilibrium valve is communicated with described sparger by the 5th pipeline.
Preferably, described sparger is obliquely installed with respect to outlet pipe; Described sparger is Y-shaped, and sparger comprises fluid injector, gas nozzle and mixing spraying pipe; Described mixing spraying pipe flare, the less opening end of described mixing spraying pipe is communicated with one end of described gas nozzle, and described mixing spraying pipe and described gas nozzle are located on the same line, the larger opening end of described mixing spraying pipe is communicated with outlet pipe; One end of described fluid injector and described the 3rd pipeline connection, the other end of described fluid injector crosses and is connected with the less opening end three of described gas nozzle and described mixing spraying pipe; Described the 5th pipeline is connected with described fluid injector.
Further preferably, described ejecting system also comprises the gas holder being communicated with the described gas nozzle of described sparger by pipeline.
Further preferably, described ejecting system also comprises the pressure-limit valve of being located between described gas holder and described sparger, and described pressure-limit valve is communicated with the described gas nozzle of described sparger by the 6th pipeline.
Further preferably, described ejecting system also comprises two two-way valves being located between described gas holder and described pressure-limit valve, and described two two-way valves are communicated with described pressure-limit valve by the 7th pipeline.
Further preferably, described ejecting system also comprises three filters of being located between described gas holder and described two two-way valves, and described three filters are communicated with described two two-way valves by the 8th pipeline, and described gas holder is communicated with described three filters by the 9th pipeline.
Preferably, described ejecting system also comprises controller; Described controller is electrically connected with described diaphragm pump, described overflow equilibrium valve and described sparger respectively.
Preferably, described overflow equilibrium valve comprises valve seat, valve gap, spring, spring pedestal, diaphragm, movable part, overflow seat, outer lining, filter screen, liner and positioning end cover; One side of described valve gap is fixedly connected with described valve seat, and the opposite side of described valve gap is provided with suction port; In described valve gap, be provided with air storing cavity; In described valve seat, be provided with the first liquid storage cylinder, fluid passage and the second liquid storage cylinder that are connected successively; One side of the valve gap dorsad of described valve seat is provided with liquid entering hole, the first liquid outlet and the second liquid outlet; Described liquid entering hole is connected with described the first liquid storage cylinder; Described overflow seat is located at the inner side of described second liquid outlet of described valve seat; In described overflow seat, be provided with overflow hole; Described movable part is located at the joint of described valve seat and described valve gap, and described movable part is positioned at a side of described second liquid outlet dorsad of described overflow seat, and is provided with slit between described movable part and described overflow seat; Described the second liquid outlet is connected with described the second liquid storage cylinder by described overflow hole; One end of the described overflow seat dorsad of described movable part is provided with described diaphragm and described spring pedestal successively; One end of described diaphragm is fixedly connected with described movable part, and the other end of described diaphragm is fixedly connected on the joint of described valve gap and described valve seat, and described diaphragm is separated described the second liquid storage cylinder and described air storing cavity; Described spring is located in described air storing cavity, and one end of described spring is fixedly connected with described spring pedestal, and the other end of described spring is fixedly connected with described valve gap; Described the first liquid outlet is connected with described the first liquid storage cylinder; One end opening of described the first liquid storage cylinder; Described filter screen is cylindrical, in described filter screen, is provided with filtering cavity; Described filter screen is located in described the first liquid storage cylinder, and one end of described filter screen is fixedly connected with described liner, and the other end of described filter screen is fixedly connected with described outer lining; Described positioning end cover is arranged at the opening end of described the first liquid storage cylinder, and described positioning end cover is fixedly connected with described valve seat; One end of described positioning end cover contacts with described outer lining; One end contacting with described outer lining of described positioning end cover is provided with at least one through hole; Described liquid entering hole is connected with described filtering cavity by described through hole; One end contacting with described outer lining of described positioning end cover is tightly connected by the second seal ring and described valve seat; Described outer lining is tightly connected by the 3rd seal ring and described valve seat; Described liquid entering hole is connected with described the second pipeline; Described the first liquid outlet is connected with described the 3rd pipeline; Described the second liquid outlet is connected with described the 4th pipeline; Described suction port is connected with described the 5th pipeline.
Further preferably, described overflow equilibrium valve also comprises the heating tape of described valve gap one side dorsad of being located at described valve seat.
Further preferably, described overflow equilibrium valve also comprises pressure transducer; Described pressure transducer is located at a side of the described liquid entering hole dorsad of described valve seat; Described pressure transducer is tightly connected by the first seal ring and described valve seat, and described pressure transducer is connected with described the first liquid storage cylinder.
The utlity model has following beneficial effect:
(1) described ejecting system is realized aqueous solution of urea by the control of overflow equilibrium valve and compressed-air actuated pressure difference remains unchanged, the flow velocity of further realizing the urea droplet of sparger ejection remains unchanged, and makes sparger to realize the accurate measurement of sprayed aqueous solution of urea and accurately to control according to the open frequency of self and dutycycle;
(2) described ejecting system filters the particulate pollutant of removing in aqueous solution of urea by overflow equilibrium valve, thereby can avoid the particulate pollutant in aqueous solution of urea to stop up sparger;
(3) sparger of described ejecting system by pressurized air carry aqueous solution of urea droplet flow, be that pressurized air provides auxiliary power for aqueous solution of urea droplet flows, be conducive to the quick ejection of aqueous solution of urea droplet, thereby improve the ejection efficiency of sparger; And can fully mix with aqueous solution of urea droplet at sparger compressed air, be conducive to form small aqueous solution of urea droplet, thereby improve the jeting effect of sparger.
Brief description of the drawings
The structural representation of the ejecting system of the aqueous solution of urea for SCR after-treatment system that Fig. 1 provides for the utility model embodiment;
The sectional drawing of the sparger of the ejecting system of the aqueous solution of urea for SCR after-treatment system that Fig. 2 provides for the utility model embodiment;
The sectional drawing of the overflow equilibrium valve of the ejecting system of the aqueous solution of urea for SCR after-treatment system that Fig. 3 provides for the utility model embodiment.
Embodiment
Below in conjunction with drawings and Examples, content of the present utility model is further described.
The ejecting system of the aqueous solution of urea for SCR after-treatment system that as shown in Figure 1, the present embodiment provides comprises urea bucket 1, diaphragm pump 2, overflow equilibrium valve 3, sparger 4, controller (ECM) 5, pressure-limit valve 6, two two-way valves 7, three filter 8 and gas holder 9.
Diaphragm pump 2 is communicated with urea bucket 1 by the first pipeline 12.Overflow equilibrium valve 3 is communicated with diaphragm pump 2 by the second pipeline 13.Sparger 4 is communicated with overflow equilibrium valve 3 by the 3rd pipeline 14.Sparger 4 is located near outlet pipe 10 places, and sparger 4 is connected with outlet pipe 10.In the present embodiment, sparger 4 is obliquely installed with respect to outlet pipe 10, makes the aqueous solution of urea droplet that sparger 4 sprays tilt to enter in outlet pipe 10.Overflow equilibrium valve 3 is communicated with urea bucket 1 by the 4th pipeline 15.Overflow equilibrium valve 3 is communicated with sparger 4 by the 5th pipeline 16.Pressure-limit valve 6 is communicated with sparger 4 by the 6th pipeline 17.Two two-way valves 7 are communicated with pressure-limit valve 6 by the 7th pipeline 18.Three filters 8 are communicated with two two-way valves 7 by the 8th pipeline 19.Gas holder 9 is communicated with three filters 8 by the 9th pipeline 20.One end of outlet pipe 10 is communicated with internal-combustion engine (not shown); The other end of outlet pipe 10 is communicated with catalyzer assembly 11.
ECM5 is electrically connected with diaphragm pump 2, overflow equilibrium valve 3 and sparger 4 respectively, for controlling the opening and closing of diaphragm pump 2, overflow equilibrium valve 3 and sparger 4.
As shown in Figure 2, in the present embodiment, sparger 4 is Y-shaped, and sparger 4 comprises fluid injector 401, gas nozzle 402 and mixes spraying pipe 403.Mix spraying pipe 403 flares, the less opening end that mixes spraying pipe 403 is communicated with one end of gas nozzle 402, and mix spraying pipe 403 and be located on the same line with gas nozzle 402, the larger opening end that mixes spraying pipe 403 is communicated with outlet pipe 10.One end of fluid injector 401 is communicated with the 3rd pipeline 14, and the other end of fluid injector 401 crosses and is connected with the less opening end three of gas nozzle 402 and mixing spraying pipe 403.Gas nozzle 402 is communicated with the 6th pipeline 17.The 5th pipeline 16 is connected with fluid injector 401.Fluid injector 401 is for to the interior injection aqueous solution of urea of gas nozzle 402 droplet, gas nozzle 402 is for to mixing spraying pipe 403 interior injection pressurized air, the pressurized air that gas nozzle 402 sprays can carry the aqueous solution of urea droplet that fluid injector 401 sprays, and to mixing, spraying pipe 403 is interior to flow, and aqueous solution of urea droplet flows to outlet pipe 10 mixing after fully mixing with pressurized air in spraying pipe 403.
The working principle of the ejecting system of the aqueous solution of urea for SCR after-treatment system that the present embodiment provides is as follows:
Urea bucket 1 is for holding aqueous solution of urea; Diaphragm pump 2 is for being transported to overflow equilibrium valve 3 through the aqueous solution of urea in the first pipeline 12 extracted urea buckets 1 and after being pressurizeed through the second pipeline 13; Overflow equilibrium valve 3 is for filtering the particulate pollutant of removing aqueous solution of urea, to avoid the sparger 4 of the particulate pollutant clog downstream in aqueous solution of urea; Aqueous solution of urea after overflow equilibrium valve 3 filters flows to sparger 4 through the 3rd pipeline 14; The pressure of the aqueous solution of urea in the 3rd pipeline 14 is labeled as P
1;
Gas holder 9 is for storing compressed air; Three filters 8 are for filtering the impurity of removing from the pressurized air of gas holder 9; Two two-way valves 7 are for controlling pressurized air from three filters 8 to sparger 4 direction one-way flow; Pressure-limit valve 6 is for controlling the compressed-air actuated pressure that flows to sparger 4;
Sparger 4 sprays to aqueous solution of urea in outlet pipe 10 with droplet form, sprays to after urea droplet in outlet pipe 10 mixes with I. C. engine exhaust and flows to catalyzer assembly 11; Pressurized air in sparger 4 flows to overflow equilibrium valve 3 through the 5th pipeline 16; Compressed-air actuated pressure in sparger 4 is labeled as P
0;
As the pressure P of aqueous solution of urea
1raise, make the compressed-air actuated pressure difference (P in aqueous solution of urea and sparger 4
1-P
0) while being greater than pressure difference threshold value, overflow equilibrium valve 3 is opened, the aqueous solution of urea in overflow equilibrium valve 3 passes back in urea bucket 1 through the 4th pipeline 15, thereby causes the pressure P of aqueous solution of urea
1start to reduce;
As the compressed-air actuated pressure P in sparger 4
0raise, make the compressed-air actuated pressure difference (P in aqueous solution of urea and sparger 4
1-P
0) while being less than pressure difference threshold value, overflow equilibrium valve 3 cuts out, the aqueous solution of urea in overflow equilibrium valve 3 stops to the interior backflow of urea bucket 1, and the aqueous solution of urea in the second pipeline 13 continues to flow in overflow equilibrium valve 3, thereby causes the pressure P of aqueous solution of urea
1again start to raise, realize the compressed-air actuated pressure difference (P in aqueous solution of urea and sparger 4 by the control of overflow equilibrium valve 3
1-P
0) remain unchanged; According to fluid Bernoulli's equation, as the compressed-air actuated pressure difference (P in aqueous solution of urea and sparger 4
1-P
0) while remaining unchanged, the flow velocity that can realize the urea droplet that sparger 4 sprays remains unchanged, thereby makes sparger 4 to realize the accurate measurement of sprayed aqueous solution of urea and accurately to control according to the open frequency of self and dutycycle.
As shown in Figure 2, overflow equilibrium valve 3 comprises valve seat 301, valve gap 302, spring 303, spring pedestal 304, diaphragm 305, movable part 306, overflow seat 307, outer lining 308, filter screen 309, liner 310, positioning end cover 311, heating tape 312 and pressure transducer 313.
One side of valve gap 302 is fixedly connected with valve seat 301, and the opposite side of valve gap 302 is provided with suction port 327.In valve gap 302, be provided with air storing cavity 328.In valve seat 301, be provided with the first liquid storage cylinder 320, fluid passage 322 and the second liquid storage cylinder 323 that are connected successively.One side of the valve gap dorsad 302 of valve seat 301 is provided with liquid entering hole 317, the first liquid outlet 321 and the second liquid outlet 326.
Liquid entering hole 317 is connected with the first liquid storage cylinder 320.Overflow seat 307 is located at the inner side of the second liquid outlet 326 of valve seat 301.Preferably, the position of overflow seat 307 and the second liquid outlet 326 is just right.In overflow seat 307, be provided with overflow hole 325.Movable part 306 is located at the joint of valve seat 301 and valve gap 302, and movable part 306 is positioned at a side of the second liquid outlet 326 dorsad of overflow seat 307, and is provided with slit 324 between movable part 306 and overflow seat 307.The second liquid outlet 326 is connected with the second liquid storage cylinder 323 by overflow hole 325.Preferably, movable part 306 is just right with the position of overflow seat 307.
One end of the seat of overflow dorsad 307 of movable part 306 is provided with diaphragm 305 and spring pedestal 304 successively.Spring pedestal 304 is for fixing and supported spring 303.One end of diaphragm 305 is fixedly connected with movable part 306, and the other end of diaphragm 305 is fixedly connected on the joint of valve gap 302 and valve seat 301, and diaphragm 305 is separated the second liquid storage cylinder 323 with air storing cavity 328.Spring 303 is located in air storing cavity 328, and one end of spring 303 is fixedly connected with spring pedestal 304, and the other end of spring 303 is fixedly connected with valve gap 302.
A side of the valve gap dorsad 302 of valve seat 301 is located in heating tape 312.Pressure transducer 313 is located at a side of the liquid entering hole dorsad 317 of valve seat 301, and pressure transducer 313 is tightly connected with valve seat 301 by the first seal ring 314, and pressure transducer 313 is connected with the first liquid storage cylinder 320.
The first liquid outlet 321 is connected with the first liquid storage cylinder 320.One end opening of the first liquid storage cylinder 320.Preferably, the sectional area of the first liquid storage cylinder 320 is greater than the sectional area of the second pipeline 13 and the 3rd pipeline 14.Filter screen 309 is cylindrical, is provided with filtering cavity 319 in filter screen 309.Filter screen 309 is located in the first liquid storage cylinder 320, and one end of filter screen 309 is fixedly connected with liner 310, and the other end of filter screen 309 is fixedly connected with outer lining 308.Liner 310 and outer lining 308 are for fixing filter screen 309.Positioning end cover 311 is arranged at the opening end of the first liquid storage cylinder 320, and positioning end cover 311 is fixedly connected with valve seat 301.
One end of positioning end cover 311 contacts with outer lining 308, and the other end of positioning end cover 311 flushes with the opening end of valve seat 301.Positioning end cover 311 is for fixing outer lining 308.Preferably, positioning end cover 311 is threaded with valve seat 301, and one end of the outer lining dorsad 308 of positioning end cover 311 is provided with bayonet socket 329, and bayonet socket 329 is for such as hexagon wrench of holding spanners, to facilitate the installation and removal of positioning end cover 311.One end contacting with outer lining 308 of positioning end cover 311 is provided with at least one through hole 318.Liquid entering hole 317 is connected with filtering cavity 319 by through hole 318.One end contacting with outer lining 308 of positioning end cover 311 is tightly connected with valve seat 301 by the second seal ring 315.Outer lining 308 is tightly connected with valve seat 301 by the 3rd seal ring 316.
The liquid entering hole 317 of overflow equilibrium valve 3 is connected with the second pipeline 13; The first liquid outlet 321 of overflow equilibrium valve 3 is connected with the 3rd pipeline 14; The second liquid outlet 326 of overflow equilibrium valve 3 is connected with the 4th pipeline 15; The suction port 327 of overflow equilibrium valve 3 is connected with the 5th pipeline 16.
The working principle of the overflow equilibrium valve 3 of the present embodiment is as follows:
Aqueous solution of urea in the second pipeline 13 flows in the filtering cavity 319 of filter screen 309 through liquid entering hole 317 and through hole 318 successively; Aqueous solution of urea in filtering cavity 319 can see through filter screen 309 and flow in the first liquid storage cylinder 320 of valve seat 301, and filter screen 309 is for filtering the particulate pollutant of removing aqueous solution of urea; Aqueous solution of urea after filtration in the first liquid storage cylinder 320 is in the first liquid outlet 321 flows into the 3rd pipeline 14, and the aqueous solution of urea after the filtration in the first liquid storage cylinder 320 is also in fluid passage 322 flows into the second liquid storage cylinder 323; Owing to no longer containing particulate pollutant in the aqueous solution of urea after filter screen 309 filters, thereby can avoid the sparger 4 of the particulate pollutant clog downstream in aqueous solution of urea;
In addition, because the sectional area of the first liquid storage cylinder 320 is greater than the sectional area of the second pipeline 13 and the 3rd pipeline 14, the flow velocity of the aqueous solution of urea in filtering cavity 319 and the first liquid storage cylinder 320 is lower than the flow velocity of the aqueous solution of urea in the second pipeline 12, and the flow velocity of the aqueous solution of urea in filtering cavity 319 and the first liquid storage cylinder 320 slows down; When aqueous solution of urea is in the time that sparger 4 sprays, the first liquid storage cylinder 320 can hold a certain amount of aqueous solution of urea, and the fluctuation of pressure of the aqueous solution of urea in the 3rd pipeline 14 and sparger 4 is weakened;
Pressurized air in the 5th pipeline 16 enters in air storing cavity 328 through the suction port 327 of overflow equilibrium valve 3; A side towards air storing cavity 328 of movable part 306 is born the elastic force of spring 303 and the pressure of air storing cavity 328 compressed airs, a side towards the second liquid storage cylinder 323 of movable part 306 is born the pressure of the aqueous solution of urea in the second liquid storage cylinder 323, and movable part 306 can be in air storing cavity 328 and the interior motion of the second liquid storage cylinder 323 under the elastic force of above-mentioned spring 303, compressed-air actuated pressure, the pressure of aqueous solution of urea and the acting in conjunction of self gravitation;
As the pressure P of the aqueous solution of urea in the second liquid storage cylinder 323
1raise, make the compressed-air actuated pressure difference (P in aqueous solution of urea and the air storing cavity 328 in the second liquid storage cylinder 323
1-P
0) while being greater than pressure difference threshold value, movable part 306 is with dynamic diaphragm 305 to air storing cavity 328 direction motions, slit 324 between movable part 306 and overflow seat 307 broadens gradually, aqueous solution of urea in the second liquid storage cylinder 323 flows out through overflow hole 325 and the second liquid outlet 326 successively, realize the unlatching of overflow equilibrium valve 3, thereby cause the pressure P of the aqueous solution of urea in the second liquid storage cylinder 323
1start to reduce;
As the compressed-air actuated pressure P in air storing cavity 328
0raise, make the compressed-air actuated pressure difference (P in aqueous solution of urea and the air storing cavity 328 in the second liquid storage cylinder 323
1-P
0) while being less than pressure difference threshold value, movable part 306 is with dynamic diaphragm 305 to the second liquid storage cylinder 323 direction motions, slit 324 between movable part 306 and overflow seat 307 narrows gradually, when movable part 306 moves to while contacting with overflow seat 307, overflow hole 325 is sealed by movable part 306, aqueous solution of urea in the second liquid storage cylinder 323 stops flowing out to overflow hole 325 and the second liquid outlet 326, realizes closing of overflow equilibrium valve 3, thereby causes the pressure P of the aqueous solution of urea in the second liquid storage cylinder 323
1again start to raise;
To-and-fro motion by movable part 306 between the second liquid storage cylinder 323 and air storing cavity 328 realizes the compressed-air actuated pressure difference (P in aqueous solution of urea and the air storing cavity 328 in the second liquid storage cylinder 323
1-P
0) remain unchanged.
The pressure transducer 313 of overflow equilibrium valve 3 is for the pressure change situation of the aqueous solution of urea in Real-Time Monitoring the first liquid storage cylinder 320, and then the Real-Time Monitoring of the running state of realization to described ejecting system.The monitoring result of pressure transducer 313 can also be served as the inline diagnosis signal (OBD) of SCR after-treatment system.
The heating tape 312 of overflow equilibrium valve 3 is for heating to overflow equilibrium valve 3 during lower than the solidification point of aqueous solution of urea when ambient temperature, thereby realizes thawing of overflow equilibrium valve 3.
The described ejecting system of the present embodiment realizes aqueous solution of urea by the control of overflow equilibrium valve and compressed-air actuated pressure difference remains unchanged, the flow velocity of further realizing the urea droplet of sparger ejection remains unchanged, and makes sparger to realize the accurate measurement of sprayed aqueous solution of urea and accurately to control according to the open frequency of self and dutycycle.The described ejecting system of the present embodiment filters the particulate pollutant of removing in aqueous solution of urea by overflow equilibrium valve, thereby can avoid the particulate pollutant in aqueous solution of urea to stop up sparger.The sparger of the described ejecting system of the present embodiment carries aqueous solution of urea droplet by pressurized air and flows, be that pressurized air provides auxiliary power for aqueous solution of urea droplet flows, be conducive to the quick ejection of aqueous solution of urea droplet, thereby improve the ejection efficiency of sparger; And can fully mix with aqueous solution of urea droplet at sparger compressed air, be conducive to form small aqueous solution of urea droplet, thereby improve the jeting effect of sparger.
Should be appreciated that the above detailed description of the technical solution of the utility model being carried out by preferred embodiment is illustrative and not restrictive.Those of ordinary skill in the art modifies reading the technological scheme that can record each embodiment on the basis of the utility model specification, or part technical characteristics is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment's technological scheme of the utility model.
Claims (10)
1. for an ejecting system for the aqueous solution of urea of SCR after-treatment system, it is characterized in that, this ejecting system comprises urea bucket (1), diaphragm pump (2), overflow equilibrium valve (3) and sparger (4);
Described diaphragm pump (2) is communicated with described urea bucket (1) by the first pipeline (12); Described overflow equilibrium valve (3) is communicated with described diaphragm pump (2) by the second pipeline (13); Described sparger (4) is communicated with described overflow equilibrium valve (3) by the 3rd pipeline (14); Described sparger (4) is located near outlet pipe (10) and is located, and described sparger (4) is connected with outlet pipe (10); Described overflow equilibrium valve (3) is communicated with described urea bucket (1) by the 4th pipeline (15); Described overflow equilibrium valve (3) is communicated with described sparger (4) by the 5th pipeline (16).
2. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 1, is characterized in that, described sparger (4) is obliquely installed with respect to outlet pipe (10); Described sparger (4) is Y-shaped, and sparger (4) comprises fluid injector (401), gas nozzle (402) and mixes spraying pipe (403);
Described mixing spraying pipe (403) flare, the less opening end of described mixing spraying pipe (403) is communicated with one end of described gas nozzle (402), and described mixing spraying pipe (403) is located on the same line with described gas nozzle (402), and the larger opening end of described mixing spraying pipe (403) is communicated with outlet pipe (10);
One end of described fluid injector (401) is communicated with described the 3rd pipeline (14), and the other end of described fluid injector (401) crosses and is connected with the less opening end three of described gas nozzle (402) and described mixing spraying pipe (403); Described the 5th pipeline (16) is connected with described fluid injector (401).
3. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 2, it is characterized in that, described ejecting system also comprises the gas holder (9) being communicated with the described gas nozzle (402) of described sparger (4) by pipeline.
4. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 3, it is characterized in that, described ejecting system also comprises the pressure-limit valve (6) of being located between described gas holder (9) and described sparger (4), and described pressure-limit valve (6) is communicated with the described gas nozzle (402) of described sparger (4) by the 6th pipeline (17).
5. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 4, it is characterized in that, described ejecting system also comprises two two-way valves (7) of being located between described gas holder (9) and described pressure-limit valve (6), and described two two-way valves (7) are communicated with described pressure-limit valve (6) by the 7th pipeline (18).
6. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 5, it is characterized in that, described ejecting system also comprises is located at the filters of three between described gas holder (9) and described two two-way valves (7) (8), described three filters (8) are communicated with described two two-way valves (7) by the 8th pipeline (19), and described gas holder (9) is communicated with described three filters (8) by the 9th pipeline (20).
7. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 1, is characterized in that, described ejecting system also comprises controller (5); Described controller (5) is electrically connected with described diaphragm pump (2), described overflow equilibrium valve (3) and described sparger (4) respectively.
8. according to the ejecting system of the aqueous solution of urea for SCR after-treatment system described in any one in claim 1-7, it is characterized in that, described overflow equilibrium valve (3) comprises valve seat (301), valve gap (302), spring (303), spring pedestal (304), diaphragm (305), movable part (306), overflow seat (307), outer lining (308), filter screen (309), liner (310) and positioning end cover (311);
One side of described valve gap (302) is fixedly connected with described valve seat (301), and the opposite side of described valve gap (302) is provided with suction port (327); In described valve gap (302), be provided with air storing cavity (328); In described valve seat (301), be provided with the first liquid storage cylinder (320), fluid passage (322) and the second liquid storage cylinder (323) that are connected successively; One side of the valve gap dorsad (302) of described valve seat (301) is provided with liquid entering hole (317), the first liquid outlet (321) and the second liquid outlet (326);
Described liquid entering hole (317) is connected with described the first liquid storage cylinder (320); Described overflow seat (307) is located at the inner side of described second liquid outlet (326) of described valve seat (301); In described overflow seat (307), be provided with overflow hole (325); Described movable part (306) is located at the joint of described valve seat (301) and described valve gap (302), described movable part (306) is positioned at a side of described the second liquid outlet (326) dorsad of described overflow seat (307), and is provided with slit (324) between described movable part (306) and described overflow seat (307); Described the second liquid outlet (326) is connected with described the second liquid storage cylinder (323) by described overflow hole (325);
One end of described overflow seat (307) dorsad of described movable part (306) is provided with described diaphragm (305) and described spring pedestal (304) successively; One end of described diaphragm (305) is fixedly connected with described movable part (306), the other end of described diaphragm (305) is fixedly connected on the joint of described valve gap (302) and described valve seat (301), and described diaphragm (305) is separated described the second liquid storage cylinder (323) and described air storing cavity (328); Described spring (303) is located in described air storing cavity (328), and one end of described spring (303) is fixedly connected with described spring pedestal (304), the other end of described spring (303) is fixedly connected with described valve gap (302);
Described the first liquid outlet (321) is connected with described the first liquid storage cylinder (320); One end opening of described the first liquid storage cylinder (320); Described filter screen (309) is cylindrical, is provided with filtering cavity (319) in described filter screen (309); Described filter screen (309) is located in described the first liquid storage cylinder (320), one end of described filter screen (309) is fixedly connected with described liner (310), and the other end of described filter screen (309) is fixedly connected with described outer lining (308); Described positioning end cover (311) is arranged at the opening end of described the first liquid storage cylinder (320), and described positioning end cover (311) is fixedly connected with described valve seat (301);
One end of described positioning end cover (311) contacts with described outer lining (308); One end contacting with described outer lining (308) of described positioning end cover (311) is provided with at least one through hole (318); Described liquid entering hole (317) is connected with described filtering cavity (319) by described through hole (318); One end contacting with described outer lining (308) of described positioning end cover (311) is tightly connected by the second seal ring (315) and described valve seat (301); Described outer lining (308) is tightly connected by the 3rd seal ring (316) and described valve seat (301);
Described liquid entering hole (317) is connected with described the second pipeline (13); Described the first liquid outlet (321) is connected with described the 3rd pipeline (14); Described the second liquid outlet (326) is connected with described the 4th pipeline (15); Described suction port (327) is connected with described the 5th pipeline (16).
9. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 8, it is characterized in that, described overflow equilibrium valve (3) also comprises the heating tape (312) of described valve gap (302) one sides dorsad of being located at described valve seat (301).
10. the ejecting system of the aqueous solution of urea for SCR after-treatment system according to claim 8, is characterized in that, described overflow equilibrium valve (3) also comprises pressure transducer (313); Described pressure transducer (313) is located at a side of the described liquid entering hole dorsad (317) of described valve seat (301); Described pressure transducer (313) is tightly connected by the first seal ring (314) and described valve seat (301), and described pressure transducer (313) is connected with described the first liquid storage cylinder (320).
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| CN201320792355.XU CN203756290U (en) | 2013-12-04 | 2013-12-04 | Urea water solution injection system used for SCR (Selective Catalytic Reduction) postprocessing system |
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| CN201320792355.XU CN203756290U (en) | 2013-12-04 | 2013-12-04 | Urea water solution injection system used for SCR (Selective Catalytic Reduction) postprocessing system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN108301905A (en) * | 2018-03-06 | 2018-07-20 | 中国第汽车股份有限公司 | Ammonia urea double ejecting system and its control method |
| CN110374727A (en) * | 2019-09-03 | 2019-10-25 | 湖北农谷环保科技有限公司 | Urea injection system for diesel engine aftertreatment system |
| CN113600359A (en) * | 2021-08-10 | 2021-11-05 | 保定市巨龙微波能设备有限公司 | Spraying system for surface treatment of rubber strip and implementation method thereof |
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2013
- 2013-12-04 CN CN201320792355.XU patent/CN203756290U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437959A (en) * | 2015-08-04 | 2017-02-22 | 浙江福爱电子有限公司 | Gas-liquid mixing type SCR spraying device |
| CN106437959B (en) * | 2015-08-04 | 2019-01-01 | 浙江福爱电子有限公司 | A kind of gas-liquid mixed SCR injection apparatus |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN106593586B (en) * | 2016-11-29 | 2019-07-05 | 潍柴动力股份有限公司 | A kind of urea injection apparatus for engine SCR system |
| CN108301905A (en) * | 2018-03-06 | 2018-07-20 | 中国第汽车股份有限公司 | Ammonia urea double ejecting system and its control method |
| CN108301905B (en) * | 2018-03-06 | 2023-08-25 | 中国第一汽车股份有限公司 | Ammonia urea double-injection system and control method thereof |
| CN110374727A (en) * | 2019-09-03 | 2019-10-25 | 湖北农谷环保科技有限公司 | Urea injection system for diesel engine aftertreatment system |
| CN113600359A (en) * | 2021-08-10 | 2021-11-05 | 保定市巨龙微波能设备有限公司 | Spraying system for surface treatment of rubber strip and implementation method thereof |
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Effective date of registration: 20151201 Address after: 075000 Zhangjiakou City, Hebei Province Xishan industry cluster zone Konglu Shen North Patentee after: Zhangjiakou General Machinery Co., Ltd. Patentee after: Zhangjiakou Baitong Environmental & Technology Co., Ltd. Address before: 075000 Zhangjiakou City, Hebei Province Xishan industry cluster zone Konglu Shen North Patentee before: Zhangjiakou Baitong Environmental & Technology Co., Ltd. |
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