CN204877612U - SCR system and catalytic reaction unit thereof - Google Patents
SCR system and catalytic reaction unit thereof Download PDFInfo
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- CN204877612U CN204877612U CN201520362986.7U CN201520362986U CN204877612U CN 204877612 U CN204877612 U CN 204877612U CN 201520362986 U CN201520362986 U CN 201520362986U CN 204877612 U CN204877612 U CN 204877612U
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- catalytic reaction
- external pipe
- reaction unit
- inner tube
- carrier
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- 238000006555 catalytic reaction Methods 0.000 title claims abstract description 52
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000004202 carbamide Substances 0.000 claims abstract description 65
- 239000007864 aqueous solution Substances 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 24
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 14
- 239000003054 catalyst Substances 0.000 claims abstract description 6
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 5
- 230000009471 action Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 97
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 54
- 238000006243 chemical reaction Methods 0.000 abstract description 24
- 230000000694 effects Effects 0.000 abstract description 11
- 239000003638 chemical reducing agent Substances 0.000 abstract description 7
- 238000009827 uniform distribution Methods 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000009718 spray deposition Methods 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 239000007921 spray Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 230000030279 gene silencing Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000010348 incorporation Methods 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 3
- 241000219146 Gossypium Species 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000969 carrier Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- -1 H 2o Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Exhaust Gas After Treatment (AREA)
Abstract
The utility model discloses a SCR system and catalytic reaction unit thereof, catalytic reaction unit includes the staving, the staving inner chamber is equipped with the hybrid chamber that admits air has the carrier of catalyst with coating, and the urea aqueous solution is in with tail gas the hybrid chamber that admits air is interior to be mixed and the reaction, and the mixture of formation is in catalytic reduction takes place down and reacts for catalyst effect on the carrier, the inner chamber of staving still is equipped with the gas uniform distribution device, so that the mixture warp the gas uniform distribution device flow direction the carrier. When tail gas passes through this gas uniform distribution device with reductant NH3, increase its spray deposition uniformity to improve nitrogen oxide's conversion rate.
Description
Technical field
The utility model relates to tail gas disposal technique field, particularly a kind of SCR system and catalytic reaction unit thereof.
Background technique
SCR (SelectiveCatalyticReduction, selective catalytic reduction) technology is that one utilizes NH
3the technology that catalytic reduction reaction eliminates nitrogen oxide (NOx) in diesel engine vent gas is there is with NOx.After SCR system process, diesel engine vent gas is made to meet state four and above Abgasgesetz.
SCR system is mainly divided into control unit, urea dosage device and catalytic reaction unit three part according to function.Wherein, catalytic reaction unit mainly comprises SCR catalyst, carrier and encapsulation thereof.During work, quantitative aqueous solution of urea sprays in outlet pipe with vaporific form, and urea droplets issues raw hydrolysis reaction in high-temperature tail gas effect, the reducing agent NH required for generation
3, NH
3be nitrogen by reduction of nitrogen oxide under the effect of catalyzer, thus make diesel engine vent gas meet Abgasgesetz.
As shown in Figure 1, Fig. 1 is the catalytic reaction cell mesh sectional view of SCR system in prior art to a kind of typical catalytic reaction unit.In this catalytic reaction unit, diesel engine vent gas enters from suction tude 1 ', and enter inner tube 4 ' through diversion division 3 ', aqueous solution of urea sprays into inner tube 4 ' by nozzle 2 ' in vaporific, the raw hydrolysis reaction of tail gas and urea hybrid concurrency in inner tube 4 ', after having reacted, the mixture generated enters in external pipe 5 ' by the perforate on inner tube 4 ' sidewall, mixture continues flowing, discharge from the aperture of external pipe 5 ' sidewall, enter in staving inner housing, finally flow to carrier 6 ', tail gas and NH
3mixed gas under the effect of the upper catalyzer of carrier 6 ', there is redox reaction, nitrogen oxide is reduced to nitrogen.
In above-mentioned urea and tail gas mixed process, because this catalytic reaction unit is not provided with even gas distribution device, tail gas and NH
3distributing homogeneity is not high, affects the conversion ratio of nitrogen oxide.Therefore, in order to improve the conversion ratio of nitrogen oxide, need to spray into more aqueous solution of urea.But when the aqueous solution of urea sprayed into is too much, catalytic reaction location contents easily forms urea crystals, the rate of fault of SCR system is caused to improve.
In view of the defect that above-mentioned catalytic reaction unit exists, urgently provide a kind of catalytic reaction unit improving gas distribution uniformity.
Model utility content
For solving the problems of the technologies described above, the purpose of this utility model is for providing a kind of SCR system and catalytic reaction unit thereof.This catalytic reaction unit arranges even gas distribution device in the front end of carrier, as tail gas and reducing agent NH
3during by this even gas distribution device, increase its distributing homogeneity, thus improve the conversion ratio of nitrogen oxide.
For realizing the purpose of this utility model, the utility model provides a kind of catalytic reaction unit of SCR system, comprise staving, described bowl inner chamber is provided with air inlet mixing chamber and is coated with the carrier of catalyzer, aqueous solution of urea and tail gas mix and react in described air inlet mixing chamber, and the mixture of formation catalytic reduction reaction occurs under catalyst action on the carrier; The inner chamber of described staving is also provided with even gas distribution device, flows to described carrier to make described mixture through described even gas distribution device.
Alternatively, described even gas distribution device is the sieve plate being located at described carrier inlet side, and described sieve plate is evenly distributed with some apertures.
Alternatively, be provided with external pipe in described air inlet mixing chamber, and its sidewall is provided with some first through holes, aqueous solution of urea mixes in described external pipe with tail gas, and discharges from described first through hole;
Described even gas distribution device is located between described external pipe and described carrier inlet side.
Alternatively, also comprise and be located at the inner and inner tube be socketed with described external pipe of described external pipe, aqueous solution of urea and tail gas first pass into described inner tube, and described inner tube sidewall is provided with some second through holes, to be communicated with described inner tube and described external pipe.
Alternatively, described first through hole is located at the side of described external pipe, and described second through hole is located at the side away from described first through hole in described inner tube, detours between described inner tube and described external pipe to make gas.
Alternatively, described second through hole is near the inlet side of described carrier.
Alternatively, also comprise the diversion division being positioned at described external pipe inlet end and caliber convergent, enter described inner tube with water conservancy diversion tail gas;
The sidewall of described diversion division is also provided with some pod apertures, enters described external pipe to make partial tail gas by described pod apertures.
Alternatively, the setting position of described pod apertures is near described second through hole.
Alternatively, described external pipe is by bowl shutoff at the bottom of described air inlet, and at the bottom of described air inlet, bowl bottom is connected with the inner housing of described staving, is fixed on described staving inner housing to make described external pipe;
The bottom of described inner tube stretches in bowl at the bottom of described air inlet, and bottom it, periphery abuts the inwall of bowl at the bottom of described air inlet, and is provided with diversion groove bottom described inner tube, to be communicated with bowl at the bottom of described inner tube and described air inlet.
For realizing the purpose of this utility model, the utility model also provides a kind of SCR system, comprises interconnective control unit, urea dosage device and catalytic reaction unit, and wherein, catalytic reaction unit is above-described catalytic reaction unit.
In existing catalytic reaction unit, the NH produced after there is hydrolysis reaction
3directly on carrier, there is catalytic reduction reaction with the mixed gas of tail gas, make tail gas and NH
3skewness, reduces the conversion ratio of nitrogen oxide, therefore, is the conversion ratio ensureing nitrogen oxide in tail gas, the dosage of required urea and the volume of carrier all larger.And in the utility model, carrier front end arranges even gas distribution device, make tail gas and NH
3mixed gas before entering carrier by this even gas distribution device, improve its distributing homogeneity, thus improve the efficiency of follow-up catalytic reduction reaction, under the prerequisite ensureing nitrogen oxide in tail gas conversion ratio, reduce the dosage of urea and the volume of carrier, reduce the cost of raw material.
Accompanying drawing explanation
Fig. 1 is the catalytic reaction cell mesh sectional view of SCR system in prior art;
Fig. 2 is the catalytic reaction modular construction schematic diagram of SCR system provided by the utility model;
Fig. 3 is the front section view of Fig. 2;
Fig. 4 is that the B-B of sieve plate in Fig. 3 is to sectional view;
Fig. 5 is that the C-C of muffling hole plate in Fig. 3 is to sectional view.
In Fig. 1:
1 ＇ suction tude, 2 ＇ nozzles, 3 ＇ diversion divisions, 4 ＇ inner tube, 5 ＇ external pipe, 6 ＇ carriers.
In Fig. 2-5:
1 suction tude, 11 nozzles, 12 air inlets are bored partially;
2 diversion divisions, 3 inner tube, 31 second through holes, 32 diversion grooves, 4 external pipe, 41 first through holes;
Bowl, 7 carriers, 8 sieve plates, 9 muffling hole plates, 91 silencing cottons at the bottom of 5 stavings, 51 staving front covers, 6 air inlets.
Embodiment
In order to realize the purpose of this utility model, the first core of the present utility model is for providing a kind of catalytic reaction unit of SCR system, and this catalytic reaction unit arranges even gas distribution device in the front end of carrier, as tail gas and reducing agent NH
3during by this even gas distribution device, increase its distributing homogeneity, thus improve the conversion ratio of nitrogen oxide, reduce the dosage of aqueous solution of urea and the volume of carrier, avoid urea crystals simultaneously, reduce the system failure.Another core of the present utility model is for providing a kind of SCR system comprising this catalytic reaction unit.
In order to make those skilled in the art understand the technical solution of the utility model better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Please refer to accompanying drawing 2-3, Fig. 2 is the catalytic reaction modular construction schematic diagram of SCR system provided by the utility model; Fig. 3 is the front section view of Fig. 2.
In a kind of embodiment, the catalytic reaction unit of SCR system, comprise staving 5, this staving 5 inner chamber is provided with air inlet mixing chamber and is coated with the carrier 7 of catalyzer, aqueous solution of urea and tail gas mix and react in air inlet mixing chamber, and the mixture of formation under catalyst action, catalytic reduction reaction occurs on carrier 7; In addition, the inner chamber of staving 5 is also provided with even gas distribution device, flows to carrier 7 to make mixture through even gas distribution device.
It should be noted that, herein, the inner chamber between staving front cover 51 and carrier 7 is air inlet mixing chamber, and tail gas mixes in this space with aqueous solution of urea, and series of physical and chemical change occur, and urea droplets is converted into the reducing agent NH of catalytic reduction reaction
3.
During catalytic reaction cell operation, quantitative aqueous solution of urea sprays in staving 5 with vaporific form by nozzle 11, and meanwhile, high-temperature diesel tail gas passes in staving 5 by suction tude 1, urea droplets issues raw hydrolysis reaction in the effect of high-temperature tail gas, the reducing agent NH required for generation
3, as shown in the formula:
NH
2CONH
2+H
2O→2NH
3+CO
2
The NH that said hydrolyzed reaction generates
3with the simulation model for mixing gases flows of tail gas to the carrier 7 being coated with catalyzer, NO, NO in tail gas
2there is catalytic reduction reaction in carrier 7, as shown in the formula:
2NO+2NO
2+4NH
3→4N
2+6H
2O
4NO+O
2+4NH
3→4N
2+6H
2O
2NO
2+O
2+4NH
3→3N
2+6H
2O
Harmful gas in tail gas is reduced to N
2, thus make diesel engine meet Abgasgesetz.
In existing catalytic reaction unit, the NH produced after there is hydrolysis reaction
3directly on carrier 7, there is catalytic reduction reaction with the mixed gas of tail gas, make tail gas and NH
3skewness, reduces the conversion ratio of nitrogen oxide.For ensureing the conversion ratio of nitrogen oxide in tail gas, the dosage of required urea and the volume of carrier 7 all larger.And in the utility model, carrier 7 front end arranges even gas distribution device, make tail gas and NH
3mixed gas before entering carrier 7 by this even gas distribution device, improve its distributing homogeneity, thus improve the efficiency of follow-up catalytic reduction reaction, under the prerequisite ensureing nitrogen oxide in tail gas conversion ratio, reduce the dosage of urea and the volume of carrier, reduce the cost of raw material, and when the urea sprayed into is less, can urea crystals be avoided, reduce the rate of fault of equipment.
Particularly, this even gas distribution device can be the sieve plate 8 being located at carrier 7 inlet side, and sieve plate 8 is evenly distributed with some apertures.
As shown in Figure 4, Fig. 4 is that the B-B of sieve plate in Fig. 3 is to sectional view.Because this even gas distribution device is the sieve plate 8 being evenly distributed with some apertures, then when mixture passes through, be equivalent to orifice jet, mixture flows out from aperture with certain speed, after very short distance, namely become turbulent flow completely, due to the pulsation of turbulent flow, the disturbance of mixture is strengthened, thus makes unconverted for NH
3urea continue hydrolysis reaction occurs, improve the conversion ratio of urea, improve the conversion ratio of nitrogen oxide further.For this sieve plate 8, by aperture and the hole pitch of aperture in this sieve plate 8 of appropriate design, make sieve plate 8 have best percent opening, can ensure the even gas distribution effect of sieve plate 8 and flow perturbation effect all better.
Be appreciated that above-mentioned even gas distribution device is not limited in be realized by sieve plate 8, also can adopt other even gas distribution devices that related domain is conventional, as adopted tubular gas uniformly distributed device.This tubular gas uniformly distributed device is made up of some guide pipes, and each guide pipe is connection carrier 7 respectively, realizes tail gas and NH by each guide pipe
3carrier 7 is uniformly distributed.But the perturbation of this tubular gas uniformly distributed device to gas is less, is unfavorable for that urea is further converted to NH
3.Therefore, the sieve plate 8 in the present embodiment can at raising tail gas and NH
3the basis of distributing homogeneity is improved the conversion ratio of urea, meanwhile, structure is simple, saves cost.
Further, can be provided with external pipe 4 in air inlet mixing chamber, and its sidewall is provided with some first through holes 41, aqueous solution of urea mixes in external pipe 4 with tail gas, and discharges from the first through hole 41; In addition, sieve plate 8 is located between external pipe 4 and carrier 7 inlet side.
Setting like this, aqueous solution of urea mixes in external pipe 4 with tail gas, and a part of urea, in external pipe 4, hydrolysis reaction occurs, and generates NH
3, now, mixture comprises NH
3, urea, tail gas, H
2o, air, mixture discharges external pipe 4 by the first through hole 41, enters staving 5 inner chamber, finally enters carrier 7 catalytic reduction reaction occurs by even gas distribution device.Due to design external pipe 4, make tail gas and aqueous solution of urea all being improved by path and incorporation time in external pipe 4, thus improve the conversion ratio of urea.
Further, also can comprise and be located at the inner and inner tube 3 be socketed with external pipe 4 of external pipe 4, aqueous solution of urea and tail gas first pass into this inner tube 3, and inner tube 3 sidewall can be provided with some second through holes 31, to be communicated with inner tube 3 and external pipe 4.
Setting like this, aqueous solution of urea and tail gas mix and react in inner tube 3, mixture enters in external pipe 4 by the second through hole 31, and discharge external pipe 4 by the first through hole 41, in the process, improve further urea and tail gas by path and incorporation time, make it continue to react, thus improve the conversion ratio of urea, reduce its use amount.
Wherein, the first through hole 41 can be located at the side of external pipe 4, and correspondingly, the second through hole 31 is located at the side away from the first through hole 41 in inner tube 3, detours between inner tube 3 and external pipe 4 to make gas; And this second through hole 31 is near the entrance of carrier 7, then the first through hole 41 is near staving front cover 51.
Be appreciated that, the position of the first through hole 41 and the second through hole 31 is not limited in this, enter external pipe 4 in order to make mixture from inner tube 3 and discharge external pipe 4, first through hole 41 and the second through hole 31 can be located at the arbitrary position of external pipe 4 and inner tube 3 sidewall respectively, but, the bimetallic tube design of splitting in the present embodiment, can extend to greatest extent tail gas and urea admixture by path and incorporation time, thus improve the conversion ratio of urea to greatest extent.
On this basis, as shown in Figure 3, the first through hole 41 can be some small sircle holes, and is uniformly distributed in the left side wall of external pipe 4, and the second through hole 31 can be some small sircle holes, and is uniformly distributed in the right side wall of inner tube 3.
Setting like this, the left side wall of external pipe 4 is evenly distributed with small sircle hole, and the right side wall of inner tube 3 is evenly distributed with small sircle hole, when mixture is through this small sircle hole, changes complete turbulent flow equally into, increases the disturbance of gas, thus improve the conversion ratio of urea.
In addition, during design inner tube 3, by reducing the diameter of inner tube 3, the flow velocity of gas in inner tube 3 can be improved, reduced the diameter of small sircle hole by the percent opening improving inner tube 3 simultaneously, turbulent perturbation can be strengthened further, thus improve the conversion ratio of urea, reduce the waiting time of urea on inner tube 3 wall simultaneously, reduce the risk of urea crystals.
Meanwhile, also can comprise and be positioned at external pipe 4 inlet end and the diversion division 2 of caliber convergent, enter described inner tube 3 with water conservancy diversion tail gas; In addition, the sidewall of this diversion division 2 also can be provided with some pod apertures, and to make partial tail gas enter external pipe 4 by pod apertures, and the setting position of this pod apertures is near the second through hole 31.
By arranging diversion division 2, making the tail gas passed into from suction tude 1 be introduced into inner tube 3, after mixing with aqueous solution of urea in inner tube 3, entering external pipe 4 by the second through hole, and can not directly enter external pipe 4 from suction tude 1.Setting like this, can extend further tail gas by path, and extend the incorporation time of itself and urea, thus improve the conversion ratio of urea.
In addition, as shown in Figure 3, the inclination angle of diversion division 2 is less, during the sidewall of tail gas high speed impact diversion division 2, forms stronger vortex disturbance, makes tail gas keep turbulence state to enter inner tube 3 and mixes with aqueous solution of urea, thus the conversion ratio of raising urea.Meanwhile, make external pipe 4 less with the height difference of inner tube 3, the aqueous solution of urea sprayed into by nozzle 11 all sprays the right side wall in inner tube 3, and can not spray the sidewall in diversion division 2, avoids urea stay in the sidewall of diversion division 2 and produce crystallization.
When tail gas enters from suction tude 1, major part enters inner tube 3 from the bottom opening of diversion division 2, and a part enters in external pipe 4 from the pod apertures of diversion division 2 right side wall.When aqueous solution of urea is sprayed in inner tube 3 right side wall by nozzle 11, easily stay in inner tube 3 wall, now, under the purging effect of tail gas being entered external pipe 4 by pod apertures, the time that urea stays in wall can be reduced, avoid urea crystals.
On the other hand, enter the mixture of external pipe 4 from the second through hole 31 and still have unconverted urea, under the effect of tail gas entering external pipe 4 from pod apertures, continue that hydrolysis reaction occurs and be converted into NH
3.In addition, the mixture entering external pipe 4 from the second through hole 31 is Convection states with the tail gas entering external pipe 4 from pod apertures, can further improve the conversion ratio of urea.
Particularly, this external pipe 4 is by bowl at the bottom of air inlet 6 shutoff, and at the bottom of this air inlet, the bottom of bowl 6 is connected with the inner housing of staving 5, with the inner housing making external pipe 4 be fixed on staving 5; The bottom of this inner tube 3 stretches in bowl 6 at the bottom of this air inlet, and bottom it, periphery is connected to the inwall of bowl 6 at the bottom of air inlet, and the bottom of this inner tube 3 is provided with diversion groove 32, to be communicated with inner tube 3 and bowl 6 at the bottom of air inlet.
By arranging diversion groove 32 in inner tube 3 bottom, air-flow unobstructedly can be flowed bottom inner tube 3, avoid the formation of air-flow dead band, reduce urea bowl 6 joint at the bottom of inner tube 3 with air inlet and form the possibility of crystallization.
Be appreciated that external pipe 4 can be also spherical cylindrical structural in bottom surface, and one-body molded, but this construction cost is high, is unfavorable for shaping.
Further, diversion division 2 top can connect air inlet and partially bore 12, and 12 tops are bored in this air inlet partially can connect suction tude 1, and this air inlet bores the center line of 12 partially near staving front cover 51, is located to make nozzle 11 left surface that air inlet bores 12 partially.As shown in Figure 3, this air inlet bores 12 partially for nozzle 11 provides installing space.
In addition, the cylinder lumen of carrier 7 rear end can be provided with muffling hole plate 9 and silencing cotton, to eliminate the noise in catalytic reaction process.
As shown in Figure 5, Fig. 5 is that the C-C of muffling hole plate in Fig. 3 is to sectional view to the structure of muffling hole plate 9.Setting like this, the air inlet mixing chamber of this catalytic reaction unit carrier 7 front end is for generating reducing agent NH
3, carrier 7 is for catalyzing and reducing nitrogen oxides, and the muffling hole plate 9 of carrier 7 rear end and silencing cotton 91 are for eliminating the noise in gas collisions, hydrolysis and catalytic reduction reaction.Therefore, this catalytic reaction unit has the function of catalytic converter and silencing apparatus simultaneously, saves as SCR system designs silencing apparatus separately, saves cost.
Add man-hour, in order to ensure that system has enough mechanical strengths, each parts of this catalytic reaction unit, comprise that suction tude 1, air inlet bore 12 partially, mode that diversion division 2, nozzle 11, inner tube 3, external pipe 4, connection at the bottom of air inlet between bowl 6, staving 5, sieve plate 8, muffling hole plate 9 all adopt welding.
The utility model also provides a kind of SCR system, comprises interconnective control unit, urea dosage device and catalytic reaction unit, and wherein, catalytic reaction unit is the catalytic reaction unit described in above any embodiment.Because above-mentioned catalytic reaction unit has above-mentioned technique effect, the SCR system comprising this catalytic reaction unit also has identical technique effect, repeats no more herein.
Above a kind of SCR system provided by the utility model and catalytic reaction unit thereof are all described in detail.Apply specific case herein to set forth principle of the present utility model and mode of execution, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection domain of the utility model claim.
Claims (10)
- The catalytic reaction unit of 1.SCR system, comprise staving (5), described staving (5) inner chamber is provided with air inlet mixing chamber and is coated with the carrier (7) of catalyzer, aqueous solution of urea and tail gas mix and react in described air inlet mixing chamber, under the mixture of the formation catalyst action on described carrier (7), catalytic reduction reaction occur; It is characterized in that, the inner chamber of described staving (5) is also provided with even gas distribution device, flows to described carrier (7) to make described mixture through described even gas distribution device.
- 2. catalytic reaction unit according to claim 1, is characterized in that, described even gas distribution device is for being located at the sieve plate (8) of described carrier (7) inlet side, and described sieve plate (8) is evenly distributed with some apertures.
- 3. catalytic reaction unit according to claim 1, it is characterized in that, external pipe (4) is provided with in described air inlet mixing chamber, and its sidewall is provided with some first through holes (41), aqueous solution of urea mixes in described external pipe (4) with tail gas, and discharges from described first through hole (41);Described even gas distribution device is located between described external pipe (4) and described carrier (7) inlet side.
- 4. catalytic reaction unit according to claim 3, it is characterized in that, also comprise and be located at the inner and inner tube (3) be socketed with described external pipe (4) of described external pipe (4), aqueous solution of urea and tail gas first pass into described inner tube (3), described inner tube (3) sidewall is provided with some second through holes (31), to be communicated with described inner tube (3) and described external pipe (4).
- 5. catalytic reaction unit according to claim 4, it is characterized in that, described first through hole (41) is located at the side of described external pipe (4), described second through hole (31) is located at the side away from described first through hole (41) in described inner tube (3), detours between described inner tube (3) and described external pipe (4) to make gas.
- 6. catalytic reaction unit according to claim 5, is characterized in that, described second through hole (31) is near the inlet side of described carrier (7).
- 7. catalytic reaction unit according to claim 4, is characterized in that, also comprises and is positioned at described external pipe (4) inlet end and the diversion division (2) of caliber convergent, enter described inner tube (3) with water conservancy diversion tail gas;The sidewall of described diversion division (2) is also provided with some pod apertures, enters described external pipe (4) to make partial tail gas by described pod apertures.
- 8. catalytic reaction unit according to claim 7, is characterized in that, the setting position of described pod apertures is near described second through hole (31).
- 9. catalytic reaction unit according to claim 4, it is characterized in that, described external pipe (4) is by bowl at the bottom of air inlet (6) shutoff, at the bottom of described air inlet, bowl (6) bottom is connected with the inner housing of described staving (5), is fixed on described staving (5) inner housing to make described external pipe (4);The bottom of described inner tube (3) stretches in bowl (6) at the bottom of described air inlet, bottom it, periphery abuts the inwall of bowl (6) at the bottom of described air inlet, and described inner tube (3) bottom is provided with diversion groove (32), to be communicated with described inner tube (3) and bowl (6) at the bottom of described air inlet.
- 10.SCR system, comprises interconnective control unit, urea dosage device and catalytic reaction unit, it is characterized in that, catalytic reaction unit is the catalytic reaction unit described in claim 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520362986.7U CN204877612U (en) | 2015-05-29 | 2015-05-29 | SCR system and catalytic reaction unit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520362986.7U CN204877612U (en) | 2015-05-29 | 2015-05-29 | SCR system and catalytic reaction unit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204877612U true CN204877612U (en) | 2015-12-16 |
Family
ID=54821995
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520362986.7U Expired - Fee Related CN204877612U (en) | 2015-05-29 | 2015-05-29 | SCR system and catalytic reaction unit thereof |
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| Country | Link |
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| CN (1) | CN204877612U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879198A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) system and catalytic reaction unit thereof |
| CN105822396A (en) * | 2016-05-23 | 2016-08-03 | 潍柴动力股份有限公司 | Urea mixing device and SCR (Selective Catalytic Reduction) system |
| CN109404103A (en) * | 2016-06-03 | 2019-03-01 | 天纳克（苏州）排放系统有限公司 | Mixing arrangement |
-
2015
- 2015-05-29 CN CN201520362986.7U patent/CN204877612U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879198A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) system and catalytic reaction unit thereof |
| CN105822396A (en) * | 2016-05-23 | 2016-08-03 | 潍柴动力股份有限公司 | Urea mixing device and SCR (Selective Catalytic Reduction) system |
| CN109404103A (en) * | 2016-06-03 | 2019-03-01 | 天纳克（苏州）排放系统有限公司 | Mixing arrangement |
| CN109404103B (en) * | 2016-06-03 | 2021-02-19 | 天纳克（苏州）排放系统有限公司 | Mixing device |
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