CN109973177A - A kind of diesel engine after treatment device - Google Patents
A kind of diesel engine after treatment device Download PDFInfo
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- CN109973177A CN109973177A CN201910250874.5A CN201910250874A CN109973177A CN 109973177 A CN109973177 A CN 109973177A CN 201910250874 A CN201910250874 A CN 201910250874A CN 109973177 A CN109973177 A CN 109973177A
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- 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
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having thermal insulation
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- 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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
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- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
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- 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]
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- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
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- 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
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- 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
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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
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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
- Y02T10/40—Engine management systems
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- 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)
Abstract
The present invention relates to a kind of diesel engine after treatment devices, belong to internal combustion engine post-processing technology field, including DPF chamber, SCR catalyst chamber, the nozzle sprayed in directed walk is installed on the channel between DPF chamber and SCR catalyst chamber, nozzle is connected with liquid feeding pipeline；Catalyst carrier is equipped in the SCR catalyst chamber, the catalyst carrier periphery is equipped with electric heater.It in cold boot of diesel or when operating in middle and slow speed of revolution, underload, gives catalyst converter to heat using the tubular electric heater of setting, achievees the purpose that the catalytic conversion efficiency for improving catalyst comprehensively.Also, in excessive discharge temperature, moreover it is possible to be sprayed water by liquid feeding pipeline and nozzle into channel, reach cooling effect, guarantee that catalyst will not fail.
Description
Technical field
The invention belongs to internal combustion engine post-processing technology fields, and in particular to a kind of diesel engine after treatment device.
Background technique
Diesel combustion major pollutants discharged are NOXAnd PM, x=1,2, to avoid pollution the dirt that the discharge of object generates
Dye, diesel engine vent gas after-treatment system become indispensable one of the system of engine.Wherein many producers use SCR
(Selective Catalytic Reduction, selective catalysis reduction) reduces NOXDischarge, but the conversion of SCR catalyst
Efficiency very temperature dependent range, common vanadium base, copper-based, iron-based and molecular sieve catalyst have its allowable work temperature range.
In diesel engine use process, in the high revolving speed high load capacity of diesel engine or DPF (the Diesel Particulate before SCR
Filter, diesel particulate trap) regeneration when, excessive discharge temperature causes catalyst failure.Such as it is at low cost, using wide
The reliable operating temperature range of general catalytic component based on vanadium is 250-550 DEG C, when delivery temperature is higher than 550 DEG C, may make vanadium
Vanadium volatilization failure effect catalytic conversion efficiency in base, and pollute the environment.So needing to diesel engine after treatment system
Delivery temperature of uniting carries out heat management, guarantees that delivery temperature is in an OK range.
In the prior art, after the Chinese invention patent application that publication No. is CN108757118A discloses a kind of diesel engine
Manage device, including sequentially connected DOC (Diesel Oxidation Catalyst, diesel oxidation catalyst), DPF and SCR
Hole for water spraying is offered on the cooling channel of catalyst converter, DPF and SCR catalyst, and water jet is installed on hole for water spraying, utilizes water jet
Cool down to the delivery temperature after dpf regeneration, cooling effect is preferable.
However, will lead to urea when cold boot of diesel or delivery temperature is lower when operating in middle and slow speed of revolution underload
Not exclusively, catalytic conversion efficiency is poor for pyrolysis hydrolysis, and pollutant discharge amount is high, and is likely to result in part of sulfuric acid salt and is attached to and urge
Agent surface, causes sulfur poisoning.Therefore, cooling when above-mentioned patent application is only able to achieve excessive discharge temperature, can not the row of solution
The problem of the lower catalytic efficiency difference for leading to catalyst in SCR catalyst of temperature degree.
Summary of the invention
The object of the present invention is to provide a kind of diesel engine after treatment devices, when for solution, delivery temperature is low in the prior art
The low problem of catalyst transformation efficiency.
In order to solve the above technical problems, the present invention proposes a kind of diesel engine after treatment device, including DPF chamber, SCR catalysis
Device chamber, the nozzle sprayed on the channel between DPF chamber and SCR catalyst chamber in installation directed walk, nozzle are connected with
Liquid feeding pipeline；Catalyst carrier is equipped in the SCR catalyst chamber, the catalyst carrier periphery is equipped with electric heater.
Diesel engine after treatment device of the invention, in cold boot of diesel or when operating in middle and slow speed of revolution, underload, benefit
It is heated with the electric heater of setting to catalyst converter, achievees the purpose that the catalytic conversion efficiency for improving catalyst.Also, in exhaust temperature
When spending high, moreover it is possible to be sprayed water by liquid feeding pipeline and nozzle into channel, reach cooling effect.
Further, the catalyst carrier is tubular, and catalyst, paving on the outside of catalyst carrier are arranged on the inside of catalyst carrier
If the electric heater, realizes flash heat transfer, improve the catalyzed conversion speed of catalyst.
Further, heat insulation cavity or insulating layer are equipped between the tubular electric heater and the shell of SCR catalyst chamber,
While realizing quick conductive, to keeping the temperature in SCR catalyst chamber, the catalytic conversion efficiency of catalyst is improved.
Further, the design of the liquid feeding pipeline includes two kinds of design schemes:
Design scheme one: the liquid feeding pipeline is divided into two-way, wherein liquid feeding pipeline is equipped with metering pump and water tank all the way, separately
Design has urea pump and urea box on liquid feeding pipeline all the way, drains into urea liquid and water each by individual liquid feeding pipeline
In channel between DPF chamber and SCR catalyst chamber, the reduction of delivery temperature is realized.
Design scheme two: the liquid feeding pipeline includes main road, is connected to the water supply branch and urea branch of main road, the water supply
Branch road is equipped with metering pump and water tank, and the urea branch road is equipped with urea pump and urea box.Being connected to branch will be in water supply branch
Water and urea branch in urea liquid mixing, mixed liquor is sprayed into channel by nozzle, realizes the reduction of delivery temperature.
It further, further include the third temperature sensor being arranged in water tank, for examining on the basis of design scheme one
The water temperature in water tank is surveyed, reaches the appropriate water temperature the case where water spray or mixed liquor into channel, guarantees to reduce delivery temperature.
It further include the controller that control connects the electric heater, the control to realize the detection of delivery temperature in channel
Device processed also controls the first temperature sensor in the channel for being connected with and being arranged between DPF chamber and SCR catalyst chamber, according to
The delivery temperature size of first temperature sensor detection performs corresponding processing, if the delivery temperature of detection is too low, control electricity adds
Hot device is opened, if the excessive discharge temperature of detection, water spray or mixed liquor into channel.
It further include the controller that control connects the electric heater, the control to realize the temperature detection of catalyst carrier
Device processed also controls the second temperature sensor being connected with She Zhi on a catalyst support, is detected and is catalyzed according to second temperature sensor
The temperature of agent carrier realizes opening or closing for electric heater, to guarantee the catalytic conversion efficiency of catalyst.
Detailed description of the invention
Fig. 1 is a kind of diesel engine after treatment device of the invention；
Fig. 2 is another diesel engine after treatment device of the invention；
Label declaration is as follows:
1 --- DPF chamber, 2 --- water tank, 3 --- third temperature sensor, 4 --- metering pump, 5 --- controller,
6 --- the first temperature sensor, 7 --- nozzle, 8 --- urea pump, 9 --- urea box, 10 --- catalyst carrier, 11 ---
Tubular electric heater, 12 --- heat insulation cavity, 13 --- second temperature sensor, 14 --- SCR catalyst chamber.
Specific embodiment
A specific embodiment of the invention is further described with reference to the accompanying drawing.
Installation practice one:
A kind of diesel engine after treatment device as shown in Figure 1, including DPF chamber 1, SCR catalyst chamber 14, DPF chamber 1
Two nozzles that water and urea liquid are sprayed in oriented exhaust passage are installed on the exhaust passage between SCR catalyst chamber 14
7, each nozzle 7 is connected with individual liquid feeding pipeline, wherein liquid feeding pipeline is equipped with metering pump 4 and water tank 2 all the way, another way is supplied
Liquid pipeline is equipped with urea pump 8 and urea box 9 for the reduction of SCR selective catalysis.
Catalyst carrier 10 is equipped in SCR catalyst chamber 14, in order to guarantee catalytic effect, catalyst carrier 10 is cylinder
Catalyst is arranged on the inside of catalyst carrier 10, is equipped with tubular electric heater 11, the tubular electric heating on the outside of catalyst carrier 10 for shape
Device is ptc heater, is wrapped in 10 periphery of catalyst carrier, and the tubular electric heater surface is coated with insulating layer.
It is equipped with heat insulation cavity 12 between tubular electric heater 11 and the shell of SCR catalyst chamber 14, plays insulation effect,
As other embodiments, heat insulation cavity 12 can also be replaced using insulating layer.
The diesel engine after treatment device further includes control system, and control system includes controller 5, which is connected with
The first temperature sensor 6 in exhaust passage is set, for detecting the gas from 1 row of DPF chamber to SCR catalyst chamber 14
Temperature；Controller 5 is also connected with second temperature sensor 13, for detecting the temperature of catalyst carrier 10；Controller 5 also controls
Metering pump 4 and urea pump 8 are connected, third temperature sensor 3 is provided in water tank 2, third temperature sensor 3 and controller 5 connect
It connects, for detecting the water temperature in water tank 2.
The working principle of above-mentioned diesel engine after treatment device are as follows:
In cold boot of diesel, ptc heater is controlled by controller 5, catalyst carrier 10 is heated, with contracting
It is short to the time up to catalyst carrier operating temperature.When controller 5 receives the catalyst carrier that second temperature sensor 13 acquires
10 temperature reaches set temperature (such as 250 DEG C), and heating finishes, and closes ptc heater.
When diesel engine runs well, diesel engine may be operated under the operating condition of middle and slow speed of revolution and underload at this time, controller 5
Control the first temperature sensor 6 measurement obtain delivery temperature, for example 200 DEG C, by the temperature good with earlier set compared with, for example
250 DEG C, then determine that delivery temperature is lower, opens ptc heater, catalyst carrier 10 is heated, its temperature is made to be in SCR
The suitable temperature ranges (i.e. said catalyst carrier operating temperature) of reaction, until delivery temperature rises to 250 DEG C or more and closes
Ptc heater.
When under the operating condition that diesel engine operates in high revolving speed, big load or before SCR, dpf regeneration, delivery temperature is higher,
It needs to carry out spray cooling.For example, the delivery temperature that controller 5 receives the acquisition of the first temperature sensor 6 is T1, higher than originally setting
The T for the catalyst operating temperature upper limit set2When, controller 5 controls metering pump 4 and absorbs water out of water tank 2, water via liquid feeding pipeline,
It is finally sprayed inside intake and exhaust channel by nozzle 7, is absorbed in exhaust using the latent heat of vaporization of water and the heat absorption capacity of vapor
Heat makes delivery temperature be reduced to the operating temperature upper limit T of catalyst to achieve the purpose that reduce delivery temperature2Hereinafter, closing
Metering pump 4 ensure that the temperature of catalyst carrier 10 is not too high.
The water of above-mentioned injection is by controller 5 according to the water in the engine operating condition of metering pump 4, delivery temperature and water tank 2
Temperature is calculated, and by taking an in-line four cylinder supercharged diesel engine as an example, detail parameters be see the table below:
| Parameter | Numerical value |
| Diesel engine discharge capacity/L | 2.7 |
| Diesel engine compression ratio | 17.5 |
| Maximum (top) speed/rmin-1 | 3600 |
| Peak torque/Nm | 220 |
| Maximum power/kW | 85 |
Catalyst choice catalytic component based on vanadium in the present embodiment, reliable operating temperature range are 250-550 DEG C, it is arranged
The operating temperature upper limit is T2=530 DEG C.
In Idling Process for Diesel Engine in the case where dpf regeneration, the flow for measuring air mass in real time is 120kg/h, and oil consumption is
6kg/h is then m=2.1kg by the exhaust quality of SCR chamber in 1min, after the first temperature sensor 6 measures dpf regeneration
Actual exhaust air temperature is T1=700 DEG C, third temperature sensor 3 measures the water temperature T in water tank 24=50 DEG C, the water of injection by
Controller 5 is calculated by following steps:
It is as follows by the exhaust quality m of SCR chamber in unit time:
M=m1+m2
In formula, m1Represent unit time engine charge quality, m2Represent unit time engine consumption quality.
High-temperature exhaust air needs the heat W released1It is as follows:
W1=ckm(T1-T2)
In formula, ckRepresent common high-temperature exhaust air specific heat capacity, ck=1018J/ (kgK)；T1Represent the first temperature sensor 6
The actual exhaust air temperature measured；T2Represent the operating temperature upper limit of catalytic component based on vanadium.
The heat W absorbed using the latent heat of vaporization and vapor heat absorption capacity of water2, as high-temperature exhaust air needs the heat released
Measure W1, it is as follows:
W2=W1
The mass M for consuming water is as follows:
In formula, c1Represent liquid water specific heat capacity, c1=4.2 × 103J/(kg·K)；T3Represent the evaporating temperature of water, T3=
100℃；T4The water temperature in water tank 2 is represented, is obtained by the measurement of third temperature sensor 3；c2Represent vaporous water specific heat capacity, c2=2.1
×103J/(kg·K)；Δ H represents the vaporization enthalpy (latent heat of vaporization) of water, Δ H=2.257 × 106J/kg。
The quality that consumption water per minute can be obtained according to above-mentioned formula is about M=0.108kg.It is controlled and is measured by controller 5
Pump 4 absorbs water out of water tank 2, exhaust passage is injected into, to reduce delivery temperature.
Compared with prior art, the invention has the advantages that the temperature of diesel catalyst carrier can be controlled effectively, make
The temperature of SCR catalysis reaction is constantly in its suitable reactions temperature range, guarantees its catalytic conversion efficiency；It opens diesel engine is cold
When dynamic, catalytic carrier is heated, subsequent catalyst reaction efficiency can be higher；In electric heating temperature-rise period, PTC is selected to add
Hot device heats catalytic carrier, and use process control is simple, and temperature control precision is high, using electricity wisely.
It, can be in addition, controller in the present embodiment is either computer, is also possible to microprocessor, such as ARM
It is programmable chip, such as FPGA, DSP.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.For example, electric heater in the present embodiment is using being wrapped in catalysis
The tubular electric heater of agent carrier periphery can also use the electric heater of other shapes, such as plate as other embodiments
Electric heater, is laid on catalyst carrier periphery, and the quantity of plate electric heater setting can be arranged one according to demand
Or more than one, if quantity is two or more, paving mode both can be to be laid side by side, or staggeredly be laid with.
As other embodiments, can also be laid on outside catalyst carrier using the electric heating wire that surface applies insulating layer coating
Side；It can also be that electric heating wire is embedded into flexible insulation matrix (such as flexible net), flexible insulation matrix be wrapped in catalysis
The outside of agent carrier, therefore, the above-mentioned electric heating wire with insulating layer or flexible insulation matrix are substantially equal with electric heater,
The catalytic effect of catalyst carrier can be reached.
For another example, the present embodiment is that two-way liquid feeding pipeline is mounted with nozzle respectively, as other embodiments, two-way liquid supply pipe
Road can also share liquid feeding pipeline all the way.
Installation practice two:
Another diesel engine after treatment device as shown in Figure 2, the diesel engine after treatment device in Installation practice one
On the basis of, the liquid feeding pipeline that nozzle 7 connects includes main road, is connected to the water supply branch and urea branch of main road, water supply branch road
Equipped with metering pump 4 and water tank 2, urea branch road is equipped with urea pump 8 and urea box 9, and the control of controller 5 connects the urea pump 8.Control
Device 5 processed controls the water that water tank 2 is sprayed water into channel by metering pump 4, and controls urea box 9 to channel by urea pump 8
The amount of the urea liquid of interior injection after the two mixes in pipeline, sprays into exhaust pipe, realizes the reduction of delivery temperature.
When under the operating condition that diesel engine operates in high revolving speed, big load or before SCR, dpf regeneration, delivery temperature is higher,
It carries out water spray and cooling is exhausted in urea liquid.Specifically, controller 5 receives the row of the first temperature sensor 6 acquisition
Temperature degree is T1, higher than the T for the catalyst operating temperature upper limit being originally arranged2When, controller 5 controls metering pump 4 out of water tank 2
Water suction controls the extracted urea solution from urea box 9 of urea pump 8, water via water supply branch, urea liquid via urea branch,
The two is converged in the main road of liquid feeding pipeline, is finally sprayed inside intake and exhaust channel by nozzle 7, utilizes the latent heat of vaporization and water of water
The heat absorption capacity of steam absorbs the heat in exhaust, to achieve the purpose that reduce delivery temperature, delivery temperature is made to be reduced to catalysis
The operating temperature upper limit T of agent2Hereinafter, closing metering pump 4 and urea pump 8, it ensure that the temperature of catalyst carrier 10 is not too high.
The work of the diesel engine after treatment device and the diesel engine after treatment device in Installation practice one of the present embodiment is former
It manages almost the same, uniquely the difference is that only that the diesel engine after treatment device of the present embodiment is mixed using water with urea liquid in advance
The mode that gas exhaust piping is sprayed into after conjunction is exhausted cooling, the calculation method of amount of water sprayed in Installation practice one it has been noted that
The amount of urea is sprayed according to NO in exhaustXAmount calculate, Computing Principle be SCR catalytic reduction reaction working principle, here
It does not repeat.
The diesel engine after treatment device of the present embodiment only needs to install a nozzle on exhaust passage first in structure,
Save the cost, installation site also preferably determine that next nozzle will not generate two kinds by spraying while spray the injection that interacts
The spray discharge pattern of the phenomenon that form, urea liquid are most important, influence spraying evaporation atomization etc., and then affect subsequent
The efficiency of SCR, thus it is more preferable using the injection form that a nozzle carries out, and the efficiency of subsequent SCR is also higher.
Sufficiently clear, complete, this implementation introduced in Installation practice one due to other working principles
Example repeats no more.
Claims (8)
1. a kind of diesel engine after treatment device, including DPF chamber, SCR catalyst chamber, DPF chamber and SCR catalyst chamber it
Between channel on the nozzle that sprays in installation directed walk, nozzle is connected with liquid feeding pipeline；It is characterized in that, the SCR catalysis
Catalyst carrier is equipped in device chamber, the catalyst carrier periphery is equipped with electric heater.
2. diesel engine after treatment device according to claim 1, which is characterized in that the catalyst carrier is tubular, is urged
Catalyst is set on the inside of agent carrier, is laid with the electric heater on the outside of catalyst carrier.
3. diesel engine after treatment device according to claim 2, which is characterized in that the electric heater and SCR catalyst
Heat insulation cavity or insulating layer are equipped between the shell of chamber.
4. diesel engine after treatment device according to claim 1, which is characterized in that the liquid feeding pipeline is divided into two-way,
In all the way liquid feeding pipeline be equipped with metering pump and water tank, design has urea pump and urea box on another way liquid feeding pipeline.
5. diesel engine after treatment device according to claim 4, which is characterized in that further include the third being arranged in water tank
Temperature sensor, for detecting the water temperature in water tank.
6. diesel engine after treatment device according to claim 1, which is characterized in that the liquid feeding pipeline includes main road, even
The water supply branch and urea branch of logical main road, the water supply branch road are equipped with metering pump and water tank, and the urea branch road is equipped with
Urea pump and urea box.
7. diesel engine after treatment device according to claim 1 or 5, which is characterized in that further include that control connects the electricity
The controller of heater, the controller also control in the channel for being connected with and being arranged between DPF chamber and SCR catalyst chamber
First temperature sensor, for the delivery temperature in sense channel.
8. diesel engine after treatment device according to claim 1 or 5, which is characterized in that further include that control connects the electricity
The controller of heater, which also controls the second temperature sensor being connected with She Zhi on a catalyst support, for examining
Survey the temperature of catalyst carrier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910250874.5A CN109973177A (en) | 2019-03-29 | 2019-03-29 | A kind of diesel engine after treatment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910250874.5A CN109973177A (en) | 2019-03-29 | 2019-03-29 | A kind of diesel engine after treatment device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109973177A true CN109973177A (en) | 2019-07-05 |
Family
ID=67081817
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910250874.5A Pending CN109973177A (en) | 2019-03-29 | 2019-03-29 | A kind of diesel engine after treatment device |
Country Status (1)
| Country | Link |
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| CN (1) | CN109973177A (en) |
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| CN110566324A (en) * | 2019-09-30 | 2019-12-13 | 潍柴动力股份有限公司 | Catalyst efficiency monitoring method and device |
| CN110714819A (en) * | 2019-10-31 | 2020-01-21 | 中自环保科技股份有限公司 | SCR (Selective catalytic reduction) purification system for ship engine tail gas |
| CN110848042A (en) * | 2019-10-12 | 2020-02-28 | 江苏大学 | Device for removing DPF particles and ash through gas-liquid multiphase injection and control method |
| CN112901320A (en) * | 2021-02-02 | 2021-06-04 | 天津市津聿动力科技有限公司 | Exhaust pipe temperature control device and system |
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