CN108368760A - Internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine - Google Patents
Internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine Download PDFInfo
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- CN108368760A CN108368760A CN201680072500.3A CN201680072500A CN108368760A CN 108368760 A CN108368760 A CN 108368760A CN 201680072500 A CN201680072500 A CN 201680072500A CN 108368760 A CN108368760 A CN 108368760A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Biomedical Technology (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Filtering Materials (AREA)
Abstract
In exhaust gas purification system for internal combustion engine (1) configured with the capture unit (21) for being loaded with catalyst particles in the exhaust passage (15) of internal combustion engine (10), simultaneously the exhaust purification unit for being loaded with oxidation catalyst is not configured in the upstream side of the micro particle catching unit (21) for being loaded with catalyst wherein in exhaust passage (15), the filter for being wherein loaded with the micro particle catching unit (21) of catalyst is made of particulate filter (21a), the catalyst (21b) that particulate filter (21a) is carried is free from the non-precious metal catalyst of noble metal.
Description
Technical field
This patent is related internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine.More particularly open
A kind of internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine, wherein reducing for purifying the useless of PM (particle matter)
The pressure loss in gas clean unit, to make being regenerated as zero or the regenerated frequencies of PM being made to be remarkably decreased for PM, even if use
There are the sulphur of high-content, the incidence for the sulfur poisoning that noble metal catalyst causes that can reduce, thus be consumed to purify PM in fuel
The fuel quantity of expense can also be reduced.
Background technology
In general, in the vehicle for being equipped with the internal combustion engines such as diesel engine, as shown in figure 3, using PM purifiers
30 come remove from internal combustion engine be discharged exhaust gas in PM (particle matter), which is by preposition oxidation catalyst
Unit 31 and the micro particle catching unit 32 for being loaded with catalyst are constituted.
In general, oxidation catalyst unit 31 uses the CO (carbon monoxide) in noble metal catalyst 31b oxidation gaseous effluents Ga
And HC, wherein noble metal catalyst 31b are located on carrier 31a and contain noble metal, performed various functions from this, such as heat up
Function so that the temperature of exhaust gas Ga is promoted；The function of removing SOOT, by a kind of oxidation of coal smoke, that is, PM；And generate NO2(two
Nitrogen oxide) function, by NO (nitric oxide) aoxidize and become nitrogen dioxide.And the catalyst of being loaded in downstream side is set
Micro particle catching unit 32 can more easily run various processing, for example, in the processing of usual burning removal PM；When PM regenerates
When pass through the processing that removes it of burning；With the desulfurization for the 32 related sulfur poisoning recovery of micro particle catching unit for being loaded with catalyst
Processing.
Meanwhile oxidation catalyst unit 31 uses the noble metal for including the platinum-group noble metals such as rhodium (Rh), palladium (Pd), platinum (Pt)
Thus catalyst 31b can lead to high cost.Thus the noble metal catalyst 31b for reducing noble metal dosage is developed.
In addition, only if oxidation catalyst unit 31, pass through the catalysis of the few low noble metal of noble metal catalyst 31b amounts
Agent coating can purify the SOF (soluble organic fraction) being attached on the SOOT of PM.But due to there is no filtering function,
Therefore very low to the purifying rate of PM.
Therefore, although being provided with the micro particle catching unit 32 for being loaded with catalyst, in order to reach on the basis of quality for example
Very small micro particle filtering efficiency as less than 10%, and the filter of the micro particle catching unit 32 to being loaded with catalyst uses
The wall-flow filter 32a of formula as a whole etc. that the entrance and exit in the cellular channel of porous ceramics alternately seals, from
And PM is inhibited to flow to downstream.
In addition, combination, ceria by carrying such as noble metal catalyst, platinum and alkalinity NOx absorbing materials
(CeO2) etc. PM oxidation catalysts etc. catalyst 32b, effect is to promote burning to remove the PM of trapping.
Furthermore in the micro particle catching unit 32 for being loaded with catalyst, when cause to be captured due to exhaust gas Ga consecutive low temperatures
When PM amounts increase, it can lead to be loaded with the pressure difference before and after the micro particle catching unit 32 of catalyst and also increase.Therefore in order to will be front and back
Pressure difference be maintained at as defined in it is below horizontal, it is necessary to carry out periodically will PM burning and removal PM regeneration treatments.Moreover,
When the catalyst 32b carried on the micro particle catching unit 32 for being loaded with catalyst makes urging for related PM burning removals because of sulfur poisoning
When changing functional deterioration, it is necessary to which catalyst temperature is set in greatly by the processing for executing sulfur poisoning recovery in sulfur poisoning recovery processing
In or equal to such as 600 degrees Celsius high temperature and also be set as carrying out desulfurization under dense combustion state.
Simultaneously as the combination of oxidation catalyst unit 31 and the micro particle catching unit 32 for being loaded with catalyst needs two to give up
Gas clean unit, therefore for example it is being not provided with oxidation catalyst unit and use wall-flow filter is loaded with the micro- of catalyst
In grain capture unit, it is proposed that a kind of exhaust emission control filter, on the partition wall of an exhaust gas flow-in side, carrying by transition metal and
Alkali metal salt constitutes the first exhaust gas purifying catalyst；The second exhaust gas containing noble metal is carried on the partition wall of exhaust gas flow-out side
Cleaning catalyst (for example, please referring to patent document 1).
Then, since exhaust emission control filter has used the second exhaust gas purifying catalyst containing noble metal, so making
With the region of high-sulfur combustor, the sulphur excluded from exhaust gas causes sulfur poisoning, oxidative function that can be weakened at branch, the purification work(of PM
It can also be weakened.And in the desulfurization process in order to solve sulfur poisoning, the dense combustion environment of high temperature is needed, so that sulfur poisoning
The fuel consumed when regeneration increases, therefore the efficiency of fuel utilization also reduces.
The problem of about sulfur poisoning, the metal composite oxide and specific alkali metal sulphuric acid being made of recently various metals
Tolerance of the mixed catalyst of salt to PM with high activity and with height, therefore propose one kind and need not use platinum family
Metal and the Diesel exhaust gas purification catalyst (referenced patent document 2 and non-patent literature 1) for substituting noble metal catalyst.
Compared with noble metal catalyst in the prior art, Diesel exhaust gas purification catalyst is not to use NO2In oxygen
Remove burning PM.Specifically, being to make its burning, and the spy of this catalyst by the way that the oxygen in air is supplied directly to PM
Sign is to make the gaseous oxygen molecule in exhaust gas to be decomposed, and the oxygen molecule being decomposed later is supplied to PM, high-effect to reach
Burning, and then remove PM.This Diesel exhaust gas purification catalyst is different from noble metal catalyst, hardly causes in sulphur
Poison.
At the same time, instead of the wall-flow filter of 90% or more PM in removing exhaust gas can be removed, it is proposed that a kind of diesel engine
Discharge treating system, having less than the fine particle filter efficiency that 10% fine particle can be filtered, and with matter
It is carried on the particulate filter (partial filter) of the particle filtration efficiency of the range with about 30%-60% on the basis of amount
With NOXThe SCR catalyst of conversion effect (for example, with reference to patent document 3).
Particulate filter is made of metallic foam filter, metal mesh etc. of the porosity between 60% to 95%.In addition,
Granular ceramics can also be used as particulate filter to use, and oxidation catalyst and PM oxidation catalysts are attached to ceramic particle
On surface, thus, it is possible to by the heat of exhaust gas come the PM for trapping and accumulating in particulate filter that burns.In addition, there is also other
The particulate filter of type, wherein the closure part of one end of unit is reduced in wall-flow filter.
<Reference listing>
Patent document
Patent document 1：Japanese Patent Laid-Open 2009-247931 bulletins
Patent document 2：Japanese Patent Laid-Open 2014-508 bulletins
Patent document 3：Japanese Patent Laid 2012-528705 bulletins
Non-patent literature
Non-patent literature 1：Palace river up to youth (Tatsuro MIYAGAWA), middle island grand great (Takahiro NAKAJIMA), long
It protects refined big (Masahiro KUBO) and palpus He Liang is situated between (Ryosuke SUGA),《Catalyst consisting of
combined metal oxide and alkali metal sulfate for diesel exhaust emissions》,
The 20-24 pages, volume 57 the 1st,《Panasonic Technical Journal》, in April, 2011.
Invention content
Technical problem
Meanwhile being loaded with the micro- of catalyst use wall-flow filter disclosed in patent document 2 and non-patent literature 1
Grain capture unit is not only easy to collect PM, also very high to the purifying rate of PM.However, being loaded with the micro particle catching unit of catalyst
There is also some problems, blocking are be easy to cause when for example, pressure detraction is huge, PM is trapped, and because be easier after blocking
Pressure difference before and after making to be loaded with the micro particle catching unit of catalyst becomes readily apparent from.Therefore, because PM regenerates and draws
The raising of the exhaust gas temperature risen, in NO2The regenerated frequencies of PM also increase in generating process, therefore the combustion expended for PM regeneration
Doses can also increase, and thus fuel utilization efficiency be caused to be deteriorated.
In addition, particulate filter disclosed in patent document 3, compared with wall-flow filter, the starting stage
The pressure loss wants smaller, and when PM is trapped the pressure loss increase also smaller.Therefore, it is to reduce to carry using particulate filter
There is the effective approach of the micro particle catching cell pressure loss of catalyst.Meanwhile the efficiency of the fine grained filtering of PM is also very high, because
This PM may not be fully cleaned up.
The method of internal-combustion engines exhaust gas purifying system and internal-combustion engines exhaust gas purifying disclosed in this patent can not only reduce because
To trap the increase for being loaded with the pressure loss caused by the micro particle catching unit of catalyst of PM, can also avoid using containing height
The sulfur poisoning in noble metal when the fuel of the sulphur of concentration, it is therefore possible to the energy of PM purifications is kept in stage long period
Power.It may be significantly reduced as a result, the PM regeneration for being loaded with the micro particle catching unit of catalyst can be zero or PM regeneration frequencies.
The means solved the problems, such as
The present invention internal-combustion engines exhaust gas purifying system include：What is be arranged in the exhaust passage of internal combustion engine is loaded with catalyst
Micro particle catching unit, wherein the exhaust purification unit of carrying noble metal catalyst is not arranged in the particle for being loaded with catalyst
In the exhaust channel of the upstream side of capture unit, wherein the filter of the micro particle catching unit for being loaded with catalyst is by particle mistake
Filter (partial filter) is constituted, and the catalyst that the particulate filter is carried is free from the non-expensive of noble metal
Metallic catalyst.
That is, the implementation of the PM purification functions in exhaust gas is not based on the oxidation catalyst unit configured in upstream side
It is completed with cooperation of the configuration in the micro particle catching unit for being loaded with catalyst in downstream side, operation is to be based on so a kind of knot
Structure is only loaded with the micro particle catching unit of catalyst not including oxidation catalyst unit in this configuration.In addition, particle filtering
The non-precious metal catalyst carried on device is made of compound without precious metal, thus aoxidizes and the PM that burns is by your non-gold
Metal catalyst is completed.
Herein, particulate filter refers to being filtered with particle on the basis of quality between 30% and 60%
The filter of micro particle filtering efficiency.Particulate filter can be made of metal foam, metal mesh, particulate ceramic etc..In addition,
Grain filter initial pressure loss it is less compared with wall-flow filter, and when trapping PM the pressure loss increment rate compared with
It is low.Therefore, in particulate filter, oxidation catalyst and PM oxidation catalysts be carried on metal foaming body opening, metal mesh and
On the surface of particulate ceramic.
According to above structure, the filtration device structure due to the use of particulate filter as trapping PM, therefore will be more with using
The case where wall-flow filter for the integral honeycomb type that the entrance and exit of the cellular flow path of hole matter ceramics alternately seals
It compares, the increase ratio of the pressure loss caused by the pressure loss and PM trappings can be significantly reduced.Therefore, for solving pressure
Can to be zero or its frequency can be substantially reduced for the PM regeneration of the growth of loss, and it is possible thereby to reduce for generating PM and
The fuel quantity being consumed, to improve the utilization ratio of fuel.
In addition, the catalyst carried on particulate filter is free from the non-precious metal catalyst of noble metal, therefore, even if
Make the ingredient of the sulphur in the exhaust gas of discharge relatively high using the high fuel of sulfur content, because your gold do not contained in catalyst
Belong to, still can be avoided that the generation of sulfur poisoning.Further, since non-noble metal catalyst contains minute quantity sulfur poisoning, therefore
The reduction of PM oxidative functions can be inhibited to maintain PM purification functions, it is possible thereby to compensate because using caused by particulate filter
The problem of reduction of PM purifying rates.
In addition, exhaust purification unit of the internal-combustion engines exhaust gas purifying system without carrying noble metal catalyst, i.e. oxidation catalysis
Agent unit, therefore the pressure loss because causing using oxidation catalyst unit can be reduced.
In addition, in the internal-combustion engines exhaust gas purifying system, non-precious metal catalyst can be answered by what various metals were constituted
Close the mixed catalyst that metal oxide and alkali metal sulfates are constituted.
Structure as described above, there are many metal composite oxides and alkali metal sulfates structure of metal composition for this
At mixed catalyst there is no use platinum metal catalyst.Moreover, different with noble metal catalyst, this mixed catalyst does not have
Have and utilizes NO2In oxygen come the PM that burns, but so that PM is burnt by directly providing the oxygen in air into PM, therefore can be with
Inhibit the incidence of sulfur poisoning, and PM is made to have better purification efficiency.As a result, it is possible to which compensating particles filter is low
PM collection rates and improve PM purifying rates as the micro particle catching unit for being loaded with catalyst.
The internal-combustion engines exhaust gas purifying of the present invention is the method for internal-combustion engines exhaust gas purifying, and wherein the particle matter in exhaust gas is by setting
The micro particle catching unit for being loaded with catalyst in exhausting waste gas channel is set to purify, includes being discharged from the exhaust passage of internal combustion engine
Exhaust gas by being loaded with the micro particle catching unit of catalyst, the unit be non-precious metal catalyst of the carrying without containing heavy metal
Particulate filter, rather than exhaust gas is made to pass through the exhaust purification unit for being loaded with noble metal catalyst.According to internal-combustion engines exhaust gas purifying
Method can obtain effect identical with internal-combustion engines exhaust gas purifying system.
Effect outstanding
According to inventive combustion engine waste gas cleaning system and method for purifying exhaust gas from internal combustion engine disclosure, using particle mistake
Filtration device structure of the filter as trapping PM (particulate matter), the increase of the pressure loss and the pressure loss can significantly reduce, so as to
Allow for solves the problems, such as the pressure loss increase PM be regenerated as zero or its frequency be substantially reduced.As a result, it is possible to reduce
The fuel quantity being consumed for generating PM, to improve the utilization ratio of fuel.
In addition, because of the catalyst carried on particulate filter using non-precious metal catalyst, therefore even if making
In the case of with the high fuel of sulphur concentration, the generation of sulfur poisoning can be also avoided.Thereby, it is possible to inhibit the reduction of PM oxidative functions simultaneously
Keep PM purification functions, it is thus possible to compensate the reduction of the PM purifying rates caused by using particulate filter.
Further, since being not provided with the Exhaust gas purifying unit of carrying noble metal catalyst, therefore the pressure loss can be reduced.
That is, by without using oxidation catalyst unit and using this combination of particulate filter, for purifying
The increase of the pressure loss and the pressure loss therein in the exhaust purification unit of PM can be reduced.In addition, by using particle mistake
Filter and this combination for using non-precious metal catalyst, not only to avoid sulfur poisoning, can also keep the pressure of low degree to damage
The PM purifying rates for high level of becoming estranged.According to two kinds of effects that three of the above combination generates, it can not only lower the regeneration frequency of PM,
By eliminating the regeneration of sulfur poisoning, the increase of the fuel consumption caused by PM purifying rates to be kept can be also reduced.
Description of the drawings
Fig. 1 is indicated according to one embodiment disclosed by the invention, i.e. the composition figure of the waste gas cleaning system of internal combustion engine.
Fig. 2 is the composition figure for the PM clean units for indicating only to be made of the micro particle catching unit for being loaded with catalyst.
Fig. 3 is the combination shape for indicating PM clean units by oxidation catalyst unit and the micro particle catching unit for being loaded with catalyst
At composition figure.
Specific implementation mode
It is by reference to attached drawing, to specifically describe disclosed internal-combustion engines exhaust gas purifying system and internal-combustion engines exhaust gas purifying below
The embodiment of method.
As shown in Figure 1, being illustrated to engine exhaust gas purification system 1.In the hair equipped with internal-combustion engines exhaust gas purifying system 1
In motivation (internal combustion engine) 10, air purifier 17, the turbine in intake channel 14 are passed sequentially through from the fresh air A of air introduction
Compressor 18b, charge air cooler 19a in supercharging device (turbo-type supercharger) 18 and intake-air throttle valve 19b, later fresh air A
Enter cylinder 10a from intake valve 12.As needed, exhaust gas Ge (EGR gas) can be flowed into company with fresh air A from EGR passage 16
Intake channel 14.
Sucking gas (A+Ge) is arranged on the piston 10b compressions in cylinder 10a, the combustion sprayed from fuel injection device 11
Material starts to burn, and thus generates the power of engine 10.The exhaust gas G that fuel combustion generates flows out to exhaust by air bleeding valve 13 and leads to
In road 15, and a part of exhaust gas G is flowed into as EGR gases Ge in EGR channel 16.At this point, remaining exhaust gas Ga (=G-Ge)
Via the turbine 18a of turbo-type supercharger 18 by being cleaned after emission-control equipment 20, then remaining exhaust gas Ga via
Silencer (not indicating) is discharged into as the exhaust gas Gc of purification in air.
In addition, emission-control equipment 20 is not equipped with preposition (pre-stage) oxidation catalyst unit, but upstream side according to
Secondary (the rear- for being furnished with the micro particle catching unit 21, selective reduction type catalyst elements (SCR) 22 and postposition that are loaded with catalyst
Stage) oxidation catalyst unit (DOC) 23.In addition, also having pressure sensor 24 and temperature sensor 25, pass through the pressure
Sensor 24 can detect the pressure difference before and after being loaded with the micro particle catching unit 21 of catalyst；Pass through the temperature sensor
25, the temperature of the exhaust gas Ga in inflow exhaust gas purifier 20 can be provided.
Fuel F is spurted into the fuel nozzle 26 in exhaust gas Ga in addition, being arranged, acts on and helps to be loaded with catalysis when necessary
PM regeneration in the micro particle catching unit 21 of agent, the process occur at the upstream for the micro particle catching unit 21 for being loaded with catalyst
In the exhaust passage 15 of side.In addition, in the upstream side of selective reduction type catalyst elements 22, there are urea injection apparatus 27, urine
Plain injection apparatus 27 effect be will be used as NOx reducing agents urea supply to be used for NOx purify selective reduction type catalyst
On unit 22.
Controller 41 equipped with the urea injection in the fuel injection and urea injection apparatus 27 in control fuel nozzle 26.
Controller 41 is desirably integrated into the total system controller 40 of the overall operation state of control engine 10 or the controller
It can also be separately provided.
As shown in Fig. 2, the filter structure for being loaded with the micro particle catching unit 21 of catalyst is formed by particulate filter 21a,
The catalyst carried on particulate filter 21a is non-precious metal catalyst 21, wherein and not containing noble metal.
Particulate filter 21a is the micro particle filtering that can be filtered with the particle on the basis of quality between 30% and 60%
The filter of efficiency.Compared with wall-flow filter, the initial pressure loss of particulate filter 21 is relatively low, and when collecting PM
The pressure loss growth it is relatively low.
Particulate filter 21a can be by metal foam, metal mesh, the formation such as particulate ceramic.By by flow honeycomb filter
The sealing of the end of device partly removes to be formed.In particulate filter 21a, surface, gold in the hole of metal foam
The surface etc. on the surface and particulate ceramic etc. that belong to net is loaded with non-precious metal catalyst 21b.
Non-noble metal catalyst 21b may be embodied in the form of mixed catalyst, by with the compound of various metals
Metal oxide and alkali metal sulfates are constituted.Transition metal sulfate or transition metal oxide and alkali metal sulfates it is mixed
Closing object has ideal PM combustion activities, vanadic anhydride (V2O5) and potassium sulfate (K2SO4) mixture and vanadic sulfate
(VOSO4) and caesium sulfate (Cs3SO4) etc. can also achieve the effect that more than.
That is, the PM purification functions in exhaust gas Ga be not based on positioned at upstream side oxidation catalyst unit and be located at
The combination of the micro particle catching unit 21 for being loaded with catalyst in downstream side is completed, but based on having abrogated oxidation catalyst unit and
Only setting is loaded with the such construction of micro particle catching unit 21 of catalyst to complete.In addition, your non-gold as cleaning catalyst
Metal catalyst, the compound by not including the noble metal such as platinum (Pt), palladium (Pd) form, and are loaded on particulate filter 21a
On, it is aoxidized from there through the catalytic action of the above non-noble metal catalyst 21b and the PM that burns.
As shown in the embodiment in embodiment disclosed by the invention, method of purifying exhaust gas from internal combustion engine is to be loaded with catalyst
Micro particle catching unit 21 in purify the PM in exhaust gas Ga, wherein the micro particle catching unit 21 for being loaded with catalyst is located at engine
In 10 exhaust passage 15.In addition, method of purifying exhaust gas from internal combustion engine is run, to which the exhaust gas Ga being discharged from engine 10 is obstructed
The exhaust purification unit for being loaded with noble metal catalyst is crossed, but by with the filtration device structure formed by particulate filter 21a
And the catalyst carried is free from the micro particle catching unit for being loaded with catalyst of the non-precious metal catalyst 21b of noble metal
21.Above is exactly the decontamination process of exhaust gas Ga.
According to internal-combustion engines exhaust gas purifying system 1 disclosed by the invention and method of purifying exhaust gas from internal combustion engine, with flow honeycomb filter
Device 32a is compared, as a result of particulate filter 21a as trapping PM construction, it is possible thereby to substantially reduce the pressure loss and
Lower by PM collection belts Lai the pressure loss increase.As a result, can be zero for solving the increased PM regeneration of the pressure loss, or
The regenerated frequencies of PM significant can reduce.Therefore, the firing rate and improve fuel utilization for generating that PM is consumed can be lowered
Efficiency.
In addition, there is non-noble metal catalyst 21b without precious metal to be carried on particulate filter 21a.Therefore, even if
The fuel of high-content sulphur is used so that in the sulphur ingredient inflow exhaust gas Ga of higher concentration, that is to say, that the fuel of engine 10
The comparison of ingredients of middle sulphur is high, but due to not having to use the catalyst containing noble metal, remains able to avoid that your gold used
Sulfur poisoning occurs often for metal catalyst.Further, since using non-precious metal catalyst 21b, it is possible to PM be inhibited to aoxidize
The reduction of function simultaneously keeps PM purification functions, therefore can also compensate the PM caused by using particulate filter 21a and purify
The reduction of rate.
In addition, according to fig. 3 shown in PM purifiers 30 in the prior art, internal-combustion engines exhaust gas purifying system 1 is not equipped with
There is oxidation catalyst unit 31, therefore can reduce due to the use of the pressure loss caused by oxidation catalyst unit 31.
That is, by the combination for not using oxidation catalyst unit 31 He taking particulate filter 21, it is net in exhaust gas
Changing the growth of the pressure loss and the pressure thus brought caused by purification PM in unit 21 can all reduce.In addition, by using
Grain filter 21a and the combination for using non-precious metal catalyst 21b, can be to avoid sulfur poisoning, while keeping the pressure of low degree
The PM purifying rates of loss and high level.The two kinds of effects generated according to above-mentioned three kinds combinations, reduce the regenerated frequencies of PM, and
By eliminating sulfur poisoning recovery, can also inhibit to keep the increase of fuel consumption caused by PM detergent powers.
This application claims priority be the Japanese patent application (JP-2015- submitted based on December 14th, 2015
243228), entire contents are incorporated herein by reference.
Industry application power
According to internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine, in the exhaust purification unit for purifying PM
The pressure loss reduce, therefore PM can be made to be regenerated as the regenerated frequencies of zero or PM significantly reduce, or even even if using containing
When the fuel of high-sulfur, the sulfur poisoning that noble metal catalyst occurs can be avoided, and in order to purify the fuel quantity that PM is consumed
It significantly reduces.
Reference sign
1：Internal-combustion engines exhaust gas purifying system
10：Engine (internal combustion engine)
15：Exhaust passage
20：Waste gas purification apparatus
21：It is loaded with the micro particle catching unit of catalyst
21a:Particulate filter
21b:Cleaning catalyst
22：Selective reduction type catalyst elements (SCR)
23：Postposition oxidation catalyst unit (DOC)
26：Fuel nozzle
27：Urea injection apparatus
40：Total system controller
41：Controller
A:Fresh air
A+Ge:The gas of sucking
G:The exhaust gas of generation
Ga:Into the exhaust gas (G-Ge) in waste gas cleaning system
Gc:The exhaust gas purified
Ge:Exhaust gas (EGR gases)
Claims (3)
1. a kind of internal-combustion engines exhaust gas purifying system, including：
It is loaded with the micro particle catching unit of catalyst, is arranged in the exhaust passage of internal combustion engine,
Wherein, carrying noble metal is not arranged in the upstream side of the micro particle catching unit for being loaded with catalyst in an exhaust gas
The exhaust purification unit of catalyst, and
Wherein, the filter of the micro particle catching unit for being loaded with catalyst be made of particulate filter, and
Wherein, the catalyst carried on the particulate filter is free from the non-precious metal catalyst of noble metal.
2. internal-combustion engines exhaust gas purifying system as described in claim 1, wherein
Above-mentioned non-precious metal catalyst be by with various metals metal composite oxide and alkali metal sulfates constitute it is mixed
Close catalyst.
3. a kind of method of internal-combustion engines exhaust gas purifying, wherein passing through the catalyst that is loaded with being arranged in the exhaust passage of internal combustion engine
Micro particle catching unit purifies the particle matter in exhaust gas, the method includes：
The exhaust gas being discharged from the internal combustion engine is set to pass through the particle filtering by being loaded with the non-precious metal catalyst for not containing noble metal
The described of device composition is loaded with the micro particle catching unit of catalyst, rather than makes exhaust gas net by the exhaust gas for carrying noble metal catalyst
Change unit.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015243228A JP2017110499A (en) | 2015-12-14 | 2015-12-14 | Exhaust emission control system for internal combustion engine and exhaust emission control method for internal combustion engine |
| JP2015-243228 | 2015-12-14 | ||
| PCT/JP2016/087082 WO2017104668A1 (en) | 2015-12-14 | 2016-12-13 | Internal-combustion engine exhaust gas purification system, and internal-combustion engine exhaust gas purification method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108368760A true CN108368760A (en) | 2018-08-03 |
Family
ID=59056730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201680072500.3A Withdrawn CN108368760A (en) | 2015-12-14 | 2016-12-13 | Internal-combustion engines exhaust gas purifying system and method for purifying exhaust gas from internal combustion engine |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2017110499A (en) |
| CN (1) | CN108368760A (en) |
| PH (1) | PH12018501202A1 (en) |
| WO (1) | WO2017104668A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925065A (en) * | 2019-12-17 | 2020-03-27 | 东风汽车集团有限公司 | Active regeneration grading control method for particle catcher |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002174111A (en) * | 2000-12-07 | 2002-06-21 | Matsushita Electric Ind Co Ltd | Exhaust gas purifying material |
| JP2011522694A (en) * | 2008-05-29 | 2011-08-04 | コーニング インコーポレイテッド | Partial wall flow filter and method |
| WO2012147333A1 (en) * | 2011-04-28 | 2012-11-01 | パナソニック株式会社 | Molten salt-type off gas purification catalyst and off gas purification filter |
| CN104285049A (en) * | 2012-05-11 | 2015-01-14 | 五十铃自动车株式会社 | Exhaust gas purification system and exhaust gas purification method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005144378A (en) * | 2003-11-18 | 2005-06-09 | Hino Motors Ltd | Exhaust emission control device |
-
2015
- 2015-12-14 JP JP2015243228A patent/JP2017110499A/en active Pending
-
2016
- 2016-12-13 CN CN201680072500.3A patent/CN108368760A/en not_active Withdrawn
- 2016-12-13 WO PCT/JP2016/087082 patent/WO2017104668A1/en active Application Filing
-
2018
- 2018-06-06 PH PH12018501202A patent/PH12018501202A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002174111A (en) * | 2000-12-07 | 2002-06-21 | Matsushita Electric Ind Co Ltd | Exhaust gas purifying material |
| JP2011522694A (en) * | 2008-05-29 | 2011-08-04 | コーニング インコーポレイテッド | Partial wall flow filter and method |
| WO2012147333A1 (en) * | 2011-04-28 | 2012-11-01 | パナソニック株式会社 | Molten salt-type off gas purification catalyst and off gas purification filter |
| CN104285049A (en) * | 2012-05-11 | 2015-01-14 | 五十铃自动车株式会社 | Exhaust gas purification system and exhaust gas purification method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925065A (en) * | 2019-12-17 | 2020-03-27 | 东风汽车集团有限公司 | Active regeneration grading control method for particle catcher |
| CN110925065B (en) * | 2019-12-17 | 2021-11-12 | 东风汽车集团有限公司 | Active regeneration grading control method for particle catcher |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2017104668A1 (en) | 2017-06-22 |
| PH12018501202A1 (en) | 2019-02-11 |
| JP2017110499A (en) | 2017-06-22 |
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Application publication date: 20180803 |