CN108930573A - Aqueous solution of urea feed system and the method for controlling the pressure oscillation in the system - Google Patents
Aqueous solution of urea feed system and the method for controlling the pressure oscillation in the system Download PDFInfo
- Publication number
- CN108930573A CN108930573A CN201710389804.9A CN201710389804A CN108930573A CN 108930573 A CN108930573 A CN 108930573A CN 201710389804 A CN201710389804 A CN 201710389804A CN 108930573 A CN108930573 A CN 108930573A
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- aqueous solution
- urea
- feed system
- triple valve
- shell
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 111
- 239000004202 carbamide Substances 0.000 title claims abstract description 111
- 239000007864 aqueous solution Substances 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000010355 oscillation Effects 0.000 title claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 21
- 239000007924 injection Substances 0.000 claims abstract description 21
- 238000011282 treatment Methods 0.000 claims abstract description 15
- 230000008676 import Effects 0.000 claims abstract description 12
- 238000010992 reflux Methods 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000001914 filtration Methods 0.000 claims 1
- 230000008859 change Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N9/00—Electrical control of exhaust gas treating apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
Abstract
The method that the present invention provides aqueous solution of urea feed system and controls the pressure oscillation in aqueous solution of urea feed system.Aqueous solution of urea feed system is used to for aqueous solution of urea being supplied to the injection apparatus of airborne exhaust treatment system, and aqueous solution of urea feed system includes：For accommodating the container of aqueous solution of urea；For aspirating the pump installation of aqueous solution of urea；For aqueous solution of urea to be transported to the aspiration line of pump installation from container；For aqueous solution of urea to be transported to the pressure line of injection apparatus from pump installation；And the reflux pipeline for aqueous solution of urea to be returned to container from pump installation.Aqueous solution of urea feed system further includes the triple valve being arranged in aspiration line, and an import of triple valve and an outlet are connected to aspiration line respectively, and ambient enviroment is led in another import of triple valve.According to the present invention it is possible to buffer the immense pressure fluctuation of aqueous solution of urea, reduce the pressure change for being transported to the aqueous solution of urea of injection apparatus, so that it is guaranteed that tail gas is effectively treated.
Description
Technical field
The present invention relates to the vent gas treatments for the machine for using diesel engine, more particularly to one kind to be used for at airborne tail gas
Reason system supplies the pressure oscillation in the aqueous solution of urea feed system and control aqueous solution of urea feed system of aqueous solution of urea
Method.
Background technique
Diesel engine is since with good reliability, the thermal efficiency is high and the characteristics such as output torque is big and is widely used in
The machines such as small-sized, heavy or oversize vehicle, ship, generator and military tanks.Have in the tail gas of diesel engine emissions
The nitrogen oxides of high level can be just discharged into after needing to handle tail gas by dedicated airborne exhaust treatment system
In atmosphere.A kind of effective technology handled the tail gas of diesel engine emissions is using selective catalytic reduction (SCR)
Method reduces the content of the nitrogen oxide in tail gas of diesel engine emissions.Selective catalytic reduction (SCR) method pass through by
Aqueous solution of urea is ejected on the mixer being arranged in tail gas discharging pipe, the blade collision on aqueous solution of urea and mixer and
It is cracked into little particulate and is pyrolyzed generation ammonia.Under the action of catalyst in catalyst converter, ammonia is as reducing agent by diesel oil
Harmful conversion of nitrogen oxides is harmless nitrogen and vapor in the tail gas of engine emission.Thus, airborne vent gas treatment system
System generally includes to be arranged in the mixer in tail gas discharging pipe, the dress of the injection for being ejected into aqueous solution of urea on mixer
Set and be arranged in tail gas discharging pipe and be located at the catalyst converter in mixer downstream.Aqueous solution of urea is generally by urea
Aqueous solution feed system is fed into the injection apparatus of airborne exhaust treatment system, and aqueous solution of urea feed system mainly includes using
In accommodate the container of aqueous solution of urea, the pump installation for aspirating aqueous solution of urea, for by aqueous solution of urea from container transport
Aspiration line to pump installation, the injection apparatus for aqueous solution of urea to be transported to airborne exhaust treatment system from pump installation
Pressure line and for by aqueous solution of urea from pump installation return container reflux pipeline.
In aqueous solution of urea feed system operational process, due to the expansion and contraction of the diaphragm pump in pump installation, pump dress
The aging for the pressure compensation element set, the opening and closing of injection apparatus, the vibration in machine running process and entire system
The reasons such as rigidity increase caused by system longtime running make the pressure of the aqueous solution of urea in pressure line generate huge fluctuation.This
The amount for the aqueous solution of urea that kind pressure oscillation sprays injection apparatus fluctuates, produced in final influence tail gas discharging pipe
Ammonia amount, and then reduce tail gas treatment effeciency.
It is then desired to existing for being fed to the aqueous solution of urea of airborne exhaust treatment system supply aqueous solution of urea
System improves.
Summary of the invention
One object of the present invention seeks to propose a kind of improved aqueous solution of urea feed system, this aqueous solution of urea
Feed system can buffer the immense pressure fluctuation of the aqueous solution of urea in the system.
For this purpose, it is according to an aspect of the present invention, a kind of aqueous solution of urea feed system, the aqueous solution of urea feeding are provided
System is used to for aqueous solution of urea being supplied to the injection apparatus of airborne exhaust treatment system, the aqueous solution of urea feed system packet
It includes：
For accommodating the container of aqueous solution of urea；
For aspirating the pump installation of aqueous solution of urea；
For by aqueous solution of urea from the container transport to the aspiration line of the pump installation；
For aqueous solution of urea to be transported to the pressure line of the injection apparatus from the pump installation；And
For aqueous solution of urea to be returned to the reflux pipeline of the container from the pump installation；
It is characterized in that, the aqueous solution of urea feed system further includes being arranged in the aspiration line and having two
The triple valve of import and an outlet, an import of the triple valve and an outlet are connected to the aspiration line respectively, and described three
Ambient enviroment is led in another import of port valve.
According to another aspect of the present invention, it provides a kind of for controlling in aqueous solution of urea feed system as described above
The method of pressure oscillation, described method includes following steps：
Determine whether the pressure oscillation of the aqueous solution of urea in the pressure line is greater than predetermined value；
When the pressure oscillation is greater than predetermined value, the outlet for controlling the triple valve is connected to first with ambient enviroment holding
Predetermined time, the outlet for then controlling the triple valve were connected to for the second predetermined time with container holding；And
It repeats the above steps.
Aqueous solution of urea feed system according to the present invention and for controlling the pressure in aqueous solution of urea feed system
The method of fluctuation can play effectively the pressure oscillation in pressure line by the way that air to be input in the shell of pump installation
Buffer function, reduce be transported to airborne exhaust treatment system injection apparatus aqueous solution of urea pressure change so that spray
The amount of the aqueous solution of urea of injection device injection keeps constant as far as possible or occurs the variation of very little, and then ensures in tail gas discharging pipe
Generated ammonia amount keeps constant or occurs the variation of very little, it is ensured that the treatment effeciency of tail gas.
Detailed description of the invention
Fig. 1 schematically shows aqueous solution of urea feed system according to the present invention；
Fig. 2 shows the pump installation and threeway electromagnetism of aqueous solution of urea feed system according to the present invention with rough schematic view
Valve connection, wherein three-way magnetic valve makes pump installation and the reservoir for accommodating aqueous solution of urea；
Fig. 3 shows the pump installation and threeway electromagnetism of aqueous solution of urea feed system according to the present invention with rough schematic view
Valve connection, wherein three-way magnetic valve makes pump installation and environment；And
Fig. 4 shows the exemplary flow of the pressure oscillation for controlling the aqueous solution of urea in aqueous solution of urea feed system
Figure.
Specific embodiment
Below with reference to each preferred embodiment of example detailed description of the present invention.It will be understood by those skilled in the art that this
A little embodiments are exemplary, it is not meant to form any restrictions to the present invention.
Fig. 1 schematically shows aqueous solution of urea feed system according to the present invention.As shown in Figure 1, according to the present invention
Aqueous solution of urea feed system 1 mainly include for accommodating the container 3 of aqueous solution of urea, the pump for aspirating aqueous solution of urea
Device 5, for by aqueous solution of urea from container 3 be transported to the aspiration line SL of pump installation 5, be used for by aqueous solution of urea from pump fill
Set the pressure line PL for the injection apparatus 9 that 5 are transported to airborne exhaust treatment system 7 and for filling aqueous solution of urea from pump
Set the reflux pipeline BL of 5 return containers 3.
Fig. 2 and Fig. 3 shows the pump installation and three of aqueous solution of urea feed system according to the present invention with rough schematic view
Three-way electromagnetic valve connects, and three-way magnetic valve makes pump installation and the reservoir for accommodating aqueous solution of urea, threeway in Fig. 3 in Fig. 2
Solenoid valve makes pump installation and environment.As shown in Figures 2 and 3, it is generallyd include for aspirating the pump installation 5 of aqueous solution of urea
Shell 11, the annular filter 13 being arranged in shell 11, the pressure balance in shell 11 and positioned at 13 center of filter
Element 15 and it is arranged between 13 outer wall of inner wall and annular filter of shell 11 so as in the inner wall of shell 11 and annular mistake
The sealing ring 18 for accommodating the first space 17 of filtered aqueous solution of urea is limited between 13 outer wall of filter.It is removed in shell 11
Second space 19 except first space 17 be usually for receive by aspiration line SL convey from the filtered of container 3
Aqueous solution of urea.Pressure compensation element 15 is usually made of the elastic material of rubber etc., can be in the effect of being under pressure
When compressed, thus play the role of adjusting or compensator or trimmer pressure fluctuation.Aspiration line SL is usually to lead to second space 19
It is connected at position on shell 11, and pressure line PL and reflux pipeline BL is usually to connect at the position for leading to the first space 17
It is connected on shell 11.In order to which aqueous solution of urea is drawn into second space 19 from container 3, pump installation 5 generally includes setting the
First pump (not shown) of such as diaphragm pump being connect in two spaces 19 and with aspiration line SL.Machine is not run in order to prevent
When aqueous solution of urea freezing and expansion leads to line fracture to the corrosion of the equipment such as injection apparatus and in cold snap, in machine
It usually also needs aqueous solution of urea returning to container 3 when not running.Therefore, pump installation 5 generally also includes setting in the first sky
Between 17 and such as diaphragm pump that is connect with reflux pipeline BL the second pump (not shown).
As shown in Figure 1-3, aqueous solution of urea feed system 1 according to the present invention further includes being arranged on aspiration line SL simultaneously
And the triple valve 21 with two imports and an outlet.One import of triple valve 21 and an outlet are connected to aspiration line SL respectively,
Ambient enviroment SE is led in another import of triple valve 21.Triple valve 21 is preferably three-way solenoid valve.In general, pump installation
5 are electrically connected with the electronic control unit (ECU) of machine and are controlled by it.According to the present invention, triple valve 21 also with machine
Electronic control unit (ECU) is electrically connected and is controlled by it.
Fig. 4 shows the exemplary flow of the pressure oscillation for controlling the aqueous solution of urea in aqueous solution of urea feed system
Figure.In Fig. 4, step S0Indicate the control of pressure oscillation of the starting to the aqueous solution of urea in pressure line.In standardization program
In, usually in step S1Judge whether the temperature of pump installation is less than the first temperature of setting, height above sea level whether be less than setting height,
And whether environment temperature is less than the second temperature of setting.Only when all answers be all it is determining, just carry out step S2.In step
Rapid S2, the pressure wave of the aqueous solution of urea in pressure line is checked using the pressure sensor being for example arranged in pressure line
It is dynamic whether to be greater than predetermined value.If in step S2Answer be it is determining, then carry out step S3.In step S3, electronic control list
The outlet of member control triple valve 21 was connected to for the first predetermined time with ambient enviroment SE, then controls triple valve 21 and continues and container 3
Keep connection.Then, in step S4, reset timer.In step S5, check whether by the second predetermined time, and true
Surely by returning to step S after the second predetermined time1.If in step S2Answer be negative, directly arrive step S5.It should
Understand, if machine is run in conventional environment, step S1It can be omitted, by step S0Step can directly be arrived
S2。
In general, being located at the intracorporal air of pump installation shell gradually after aqueous solution of urea feed system runs a period of time
It is dissolved into aqueous solution of urea and as aqueous solution of urea is discharged out of shell.With the growth of runing time, due to shell
Intracorporal air is fewer and fewer, and especially the air in aspiration line SL and second space 19 is fewer and fewer, and entire urea is water-soluble
Pressure in liquid feed system is more and more unstable.Although in the mistake that aqueous solution of urea is withdrawn into container using the second pump
Cheng Zhong, some air can enter in the first space 17, but due to being filled with aqueous solution of urea, siphon in second space 19
Effect hinders air and enters in second space 19.
However, according to the present invention, there is the triple valve 21 of two imports and an outlet by being arranged on aspiration line SL, and
And outlet and the ambient enviroment SE that triple valve is controlled after aqueous solution of urea feed system runs a period of time keep communicating it is pre-
It fixes time, to make a certain amount of air enter in the shell 11 of pump installation 5, especially in second space 19.Air is pressed
Contracting is more much better than the compressibility of the aqueous solution of urea in liquid form, when the expansion and receipts due to the diaphragm pump in pump installation
Contracting, the aging of pressure compensation element in pump installation, the opening and closing of injection apparatus, the vibration in machine running process, with
And the reasons such as increase of rigidity caused by whole system longtime running go out the pressure of the aqueous solution of urea in pressure line may
When existing huge fluctuation, the air in the shell 11 of pump installation 5 especially second space 19 can have been played this pressure oscillation
The buffer function of effect reduces the pressure change for being transported to the aqueous solution of urea of injection apparatus 9 of airborne exhaust treatment system 7, makes
The amount for obtaining the aqueous solution of urea of injection apparatus injection keeps constant as far as possible or occurs the variation of very little, and then ensures exhaust emissions
Generated ammonia amount keeps constant or occurs the variation of very little in pipe, it is ensured that the treatment effeciency of tail gas.
Above in conjunction with specific embodiments to the present invention have been described in detail.Obviously, above description and show in the accompanying drawings
Embodiment out should be construed as illustratively, but not to limit the present invention.For those skilled in the art
Speech, can carry out various variations or modifications to it without departing from the spirit of the invention, these variations or modifications are not
It departs from the scope of the present invention.
Claims (8)
1. a kind of aqueous solution of urea feed system (1), the aqueous solution of urea feed system (1) is for supplying aqueous solution of urea
To the injection apparatus (9) of airborne exhaust treatment system (7), the aqueous solution of urea feed system (1) includes：
For accommodating the container (3) of aqueous solution of urea；
For aspirating the pump installation (5) of aqueous solution of urea；
For aqueous solution of urea to be transported to the aspiration line (SL) of the pump installation (5) from the container (3)；
For aqueous solution of urea to be transported to the pressure line (PL) of the injection apparatus (9) from the pump installation (5)；And
For aqueous solution of urea to be returned to the reflux pipeline (BL) of the container (3) from the pump installation (5)；
It is characterized in that, the aqueous solution of urea feed system (1) further includes being arranged on the aspiration line (SL) and having
Have two imports and one outlet triple valve (21), an import of the triple valve (21) and one outlet respectively with the aspiration line
(SL) it is connected to, ambient enviroment (SE) is led in another import of the triple valve (21).
2. aqueous solution of urea feed system (1) according to claim 1, which is characterized in that the triple valve (21) is three
Three-way electromagnetic valve.
3. aqueous solution of urea feed system (1) according to claim 1, which is characterized in that the aqueous solution of urea into
When being run to system (1), the outlet of the triple valve (21) be switched to after connecting predetermined time with the container (3) with
The ambient enviroment (SE) connects another predetermined time.
4. aqueous solution of urea feed system (1) according to claim 2, which is characterized in that the triple valve (21) and electricity
Sub-control unit is electrically connected, in the aqueous solution of urea feed system (1) operation, the electronic control unit control described three
The outlet of port valve (21) is switched to after connecting the predetermined time with the container (3) to be connected separately with the ambient enviroment (SE)
One predetermined time.
5. aqueous solution of urea feed system (1) according to claim 1, which is characterized in that the pump installation (5) includes shell
Body (11)；
The annular filter (13) being arranged in the shell (11)；
The pressure compensation element (15) for being arranged in the shell (11) and being located in the filter (13)；
After being arranged between the inner wall and the annular filter (13) outer wall of the shell (11) to limit for accommodating filtering
Aqueous solution of urea the first space (17) sealing ring；
The first pump for being arranged in the shell (11) and being connect with the aspiration line (SL)；And
The second pump for being arranged in the shell (11) and being connect with the reflux pipeline (BL).
6. aqueous solution of urea feed system (1) according to claim 5, which is characterized in that the aspiration line (SL) exists
Lead at the position in the shell (11) for the second space (19) for accommodating filtered aqueous solution of urea and is connected to institute
It states on shell (11), the pressure line (PL) and the reflux pipeline (BL) are at the position for leading to first space (17)
It is connected on the shell (11).
7. a kind of method for controlling the pressure oscillation in aqueous solution of urea feed system described in any claim as above,
Described method includes following steps：
Determine whether the pressure oscillation of the aqueous solution of urea in the pressure line is greater than predetermined value；
When the pressure oscillation is greater than predetermined value, the outlet for controlling the triple valve (21) is connected to ambient enviroment (SE) holding
First predetermined time, the outlet for then controlling the triple valve (21) keep being connected to for the second predetermined time with the container (3)；With
And
It repeats the above steps.
8. further including the method for claim 7, following steps：
Determine whether the temperature of the pump installation is less than the first temperature of setting；
Determine whether height above sea level is less than the height of setting；And；
Whether environment temperature is less than the second temperature of setting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710389804.9A CN108930573B (en) | 2017-05-27 | 2017-05-27 | Urea aqueous solution feeding system and method of controlling pressure fluctuation in the same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710389804.9A CN108930573B (en) | 2017-05-27 | 2017-05-27 | Urea aqueous solution feeding system and method of controlling pressure fluctuation in the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911273A (en) * | 2020-08-20 | 2020-11-10 | 安徽江淮汽车集团股份有限公司 | Method and system for monitoring urea consumption of vehicle |
| CN112682130A (en) * | 2019-10-18 | 2021-04-20 | 中国船舶重工集团公司第七一一研究所 | Marine urea supply injection system and method |
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| CN102269031A (en) * | 2011-07-01 | 2011-12-07 | 吉林大学 | Universal type selective catalytic reduction (SCR) injection system |
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| CN111911273A (en) * | 2020-08-20 | 2020-11-10 | 安徽江淮汽车集团股份有限公司 | Method and system for monitoring urea consumption of vehicle |
| CN111911273B (en) * | 2020-08-20 | 2021-06-08 | 安徽江淮汽车集团股份有限公司 | Method and system for monitoring urea consumption of vehicle |
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