CN100416056C - Exhaust gas cleaning device and its method - Google Patents
Exhaust gas cleaning device and its method Download PDFInfo
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- CN100416056C CN100416056C CNB2006101148730A CN200610114873A CN100416056C CN 100416056 C CN100416056 C CN 100416056C CN B2006101148730 A CNB2006101148730 A CN B2006101148730A CN 200610114873 A CN200610114873 A CN 200610114873A CN 100416056 C CN100416056 C CN 100416056C
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Abstract
An exhaust gas cleaning device comprises an exhaust gas passage (31, 32, 33) through which exhaust gas passes from an engine (60), a nitrogen oxide cleaning catalyst (40) arranged in an arbitrary part of the exhaust gas passage and a reducing agent delivery unit (10) for adding a reducing agent to depurate the nitrogen oxide in the exhaust gas. The reducing agent delivery unit (10) on the upstream of the nitrogen oxide cleaning catalyst (40) adds the reducing agent in the exhaust gas. The reducing agent delivery unit further includes a reducing agent separation film for separating the strong reducing component from the mixture containing the strong reducing component and at least one other component by utilizing the heating and the resulting strong reducing component is used as a reducing agent.
Description
Technical field
The present invention relates to be used for to purify (reduction) apparatus and method from the nitrogen oxides from exhaust gas of the internal-combustion engine discharge of vehicle etc.
Background technique
Because fuel burns in oxygen-enriched environment, so diesel engine or poor combustion petrol engine have improved fuel economy.That is to say and to reduce CO
2Discharge amount.But, comprise relatively large nitrogen oxide unfriendly from the waste gas of diesel engine or the discharge of poor combustion petrol engine.
Uncensored Japan Patent publication discloses a kind of purification method that is used for purifying (reduction) nitrogen oxide for 2004-27881 number, in this method, waste gas has been used small amount of carbon hydrogen compound (HC), thereby will offer the catalyst of purification (reduction) nitrogen oxide with oxynitrides as the waste gas of rich gas.So waste gas has just obtained reduction and has purified.
Here, the fuel of diesel engine etc. is the source of HC.The fuel of diesel engine is light oil normally, and well-known light oil comprises various HC, such as the HC that can reduce nitrogen oxide (reduce by force composition, for example n-paraffin) effectively, and the HC that demonstrates more weak reduction.Strong reduction composition has different reduction/purifying abilitys with other composition to reduction/purifying nitrogen oxide.Therefore, when using the composition of weak reducing capacity, may increase use amount.This can cause the decline of fuel economy unfriendly.And, be necessary to simplify the device that from the such fuel of light oil, separates strong reduction composition.
Summary of the invention
What make that the present invention considers is above-mentioned shortcoming.Therefore, an object of the present invention is to provide a kind of apparatus and method that are used for purifying exhaust air, this apparatus and method are avoided or have been alleviated at least one above-mentioned shortcoming.
For realizing purpose of the present invention, a kind of waste gas cleaning plant is provided, it comprises that exhaust steam passage, purification of nitrogen oxides catalyst and reducing agent add module.Exhaust flow from internal-combustion engine is crossed exhaust steam passage.The purification of nitrogen oxides catalyst is positioned at the random position of exhaust steam passage, and wherein the purification of nitrogen oxides catalyst utilizes the nitrogen oxide in the reducing agent purifying exhaust air.Reducing agent adds module reducing agent is added in the exhaust steam passage, and it is positioned at upstream one side of purification of nitrogen oxides catalyst on the exhaust gas flow direction.Reducing agent adds module and comprises the reducing agent separation module, is used for utilizing heat to separate strong reduction composition from mixture, contains strong reduction composition and at least a other composition in this mixture.Be used as reducing agent by the isolated strong reduction composition of reducing agent separation module.
In order to realize purpose of the present invention, also provide a kind of exhaust gas purifying method.In this method, to contain strong reduction composition and at least a other mixture of ingredients and introduce a side of Separation membrane, wherein Separation membrane comprises the selectively penetrating hole, and the selectively penetrating hole allows the less relatively strong reduction composition infiltration of molecular dimension in the mixture by the selectively penetrating hole selectively.The waste gas introducing is contacted with the opposite side of Separation membrane, make and from mixture, isolate strong reduction composition, and isolated reduction composition is added in the waste gas.
In order to realize purpose of the present invention, also provide a kind of exhaust gas purifying method.In this method, will contain the side that strong reduction composition and at least a other mixture of ingredients are introduced Separation membrane, Separation membrane wherein allows strong reduction composition infiltration the passing through Separation membrane in the mixture selectively.The high-temperature gas introducing is contacted with the opposite side of Separation membrane, make and from mixture, isolate strong reduction composition, and isolated reduction composition is added in the high-temperature gas.
Description of drawings
From following explanation and following claim and accompanying drawing, will be better appreciated by the present invention and other purpose, characteristics and advantage, wherein:
Fig. 1 is a schematic diagram, shows the structure of waste gas cleaning plant among first embodiment;
Fig. 2 is the schematic appearance that reducing agent adds facility;
Fig. 3 is the schematic appearance of reducing agent separation facilities, and it adds the inside of facility at reducing agent;
Fig. 4 is the generalized section that the reducing agent separation facilities of its internal structure is shown;
Fig. 5 is the amplification profile schematic representation of a reducing agent separation facilities part shown in Figure 4;
Fig. 6 is the generalized section of the further amplification of a zoomed-in view part shown in Figure 5;
Fig. 7 is a flow chart, shows the method for first embodiment's of control waste gas cleaning plant;
Fig. 8 is the improved generalized section of first embodiment's reducing agent separation facilities, and this improvement has the Separation membrane zone of expansion; And
Fig. 9 is a schematic diagram, shows the structure of waste gas cleaning plant among second embodiment.
Embodiment
(first embodiment)
Below in conjunction with description of drawings first embodiment of the present invention.The waste gas cleaning plant of present embodiment purifies the waste gas of discharging from as the diesel engine of internal-combustion engine.As shown in Figure 1, the waste gas cleaning plant of present embodiment comprises exhaust steam passage 31,32,33, purification of nitrogen oxides (reduction) catalyst 40, and reducing agent adds facility (reducing agent interpolation module) 10.Waste gas process exhaust steam passage 31,32,33 from diesel engine 60 discharges.Purification of nitrogen oxides catalyst 40 is installed in the exhaust steam passage.Reducing agent adds facility 10 and is installed between the exhaust steam passage 31,32, that is to say, between diesel engine 60 and purification of nitrogen oxides catalyst 40 (reducing agent that promptly is installed in the exhaust steam passage adds upstream one side that facility 10 is positioned at purification of nitrogen oxides catalyst 40).Purification of nitrogen oxides catalyst 40 and reducing agent add facility 10, and each has all constituted the part of exhaust steam passage.
Reducing agent adds facility 10 and comprises fuel inlet port 111 and Oil residue recuperation port one 31 (see figure 2)s.Introduce the light oil (fuel that is used for internal-combustion engine) that serves as mixture from fuel inlet port 111 and enter the inside that reducing agent adds facility 10.Also having, in oil separate on the lenient side with reducing composition by force that the back produces, is the Residual oil of light oil residue, discharges and reclaims by Oil residue recuperation port one 31.Fuel feed passage 21 is connected with the fuel inlet port 111 that reducing agent adds facility 10.Utilize pump (mixture supply module) 20 to provide light oil to fuel inlet port 111 from fuel tank (mixture case) 50 by fuel feed passage 21.
The Oil residue recuperation port one 31 that reducing agent adds facility 10 is connected with fuel tank 50 by Oil residue recuperation passage 22, thereby is reduced after agent interpolation facility 10 isolates reducing composition by force, and the residue of light oil is recovered in the fuel tank.Oil residue recuperation passage 22 can comprise regulator, and the pressure that makes reducing agent add light oil in the facility 10 keeps equating with predetermined pressure or wants high.When reducing agent added the pressure increase of light oil in the facility 10, the amount of isolated strong reduction composition should be able to increase.
The light oil discharge-amount of electronic control unit (ECU) 70 control pumps 20.That is to say that ECU70 control offers the amount that reducing agent adds the light oil of facility 10.ECU 70 links to each other with nitrogen oxide (NOx) sensor 72 with temperature transducer 71.Temperature transducer 71 is installed in 31 li of exhaust steam passages, is used for measuring the temperature of the waste gas that flows into reducing agent interpolation facility 10.NOx sensor 72 is measured from the concentration of the nitrogen oxide of purification of nitrogen oxides catalyst 40 discharges.Describe in detail although omitted it, ECU 70 is connected with the various sensors of measuring various physical quantitys.
Reducing agent adds facility 10 and comprises main component and reducing agent separating member (reducing agent separation module), shown in Fig. 2,3.The part of exhaust steam passage is amplified the formation main component, and the reducing agent separating member is arranged in main component.The reducing agent separating member comprises separator (hollow separator) 12, and it separates strong reduction composition from light oil.Each separator 12 all is to be generally columniform tubular member, and it comprises carrier 122 and Separation membrane 121.Carrier 122 is tubular members, and it constitutes (that is, carrier 122 comprises for waste gas or high-temperature gas at physics and chemically durable material) by stainless steel porous bodies or mullite.Separation membrane 121 constitutes on the inwall of carrier 122, comprises it being a kind of silicalite of zeolite.Use zeolite to be because can easily control the pore diameter of zeolite by processing conditions and its composition.The pore diameter of Separation membrane 121 is controlled in 0.39nm between the 0.57nm, and about more specifically 0.55nm can select molecular sieve to replace silicalite as Separation membrane 121.
Isolate n-paraffin in the light oil that the silicalite that utilization forms, separator 12 flow from separator 12 on separator 12 inwalls.Specifically, the molecular diameter of n-paraffin approximately is 0.38nm, so n-paraffin can permeate by Separation membrane 121.But, molecular diameter approximately be 0.58nm aromatic component then not porous by Separation membrane 121.Based on the above-mentioned fact, can realize the separation of n-paraffin.That is to say, therefore arbitrarily diaphragm as Separation membrane 121, as long as diaphragm allow molecular diameter be 0.38nm or littler molecule infiltration by diaphragm, be that 0.58nm or bigger molecule infiltration pass through just but do not allow molecular diameter.
The installation of separator 12 makes the flow direction that is parallel to waste gas of each separator 12, separator 12 that 4 rows, five of every rows be arranged.One end of each separator 12 links to each other with bindiny mechanism 112, and bindiny mechanism 112 is connecting fuel inlet port 111.The other end of each separator 12 links to each other with bindiny mechanism 132, and bindiny mechanism 132 is connecting Oil residue recuperation port one 31.The light oil of introducing by fuel inlet port 111 flows through bindiny mechanism 112,20 separators 12, bindiny mechanism 132 and Oil residue recuperation port ones 31 successively.
That is to say that as shown in Figure 4, add in the facility 10 at reducing agent, fuel flows through after fuel inlet port 111 and the bindiny mechanism 112, flows into these separators 12.In separator, separate strong reduction composition.Then, resid oil stream is crossed bindiny mechanism 132, reclaims Residual oil by Oil residue recuperation port one 31.
Purification of nitrogen oxides catalyst 40 utilizes such as the reaction of adding this strong reduction composition of n-paraffin in the waste gas to and reduces and purifying nitrogen oxide.But catalyst is not limited to following Example, other catalyzer that catalyst can have suitable substrate (ceramic substrate, metal substrate) to support.Other catalyzer comprises, for example, and zeolite selective reduction catalyst, aluminium oxide selective reduction catalyst, Pt-Ba selective reduction catalyst and Pt threeway catalyzer.
The following describes effect.Because waste gas cleaning plant is constructed in the manner described above, so the waste gas cleaning plant of present embodiment can produce following effect.In other words, by fuel feed passage 21 light oil of 50 li of fuel tanks is offered reducing agent by pump 20 and add facility 10.Offer reducing agent and add the light oil of facility 10 by fuel inlet port 111 introducing reducing agent separating members.
Then, light oil arrives separator 12 by fuel inlet port 111 and bindiny mechanism 112.In separator 12, the strong reduction composition that molecular dimension is little is discharged in the exhaust steam passage by Separation membrane 121.Rely on to allow light oil (n-paraffin) infiltration by Separation membrane 121, Separation membrane 121 can be isolated n-paraffin effectively.Generally speaking, by the temperature of n-paraffin is brought up to the pressure that is above the boiling point or reduces n-paraffin, can evaporate n-paraffin.But the said method that reduces pressure needs main equipment and big energy.For example, for the boiling point of n-heptane from (1.0 barometric pressure) under the normal pressure 98.4 ℃ being reduced in the scope between the normal temperature to 50 ℃, the pressure of n-heptane need be reduced to about 0.1 to 0.2 barometric pressure.Therefore, the raising method of temperature of present embodiment use is to utilize the used heat of waste gas.Here, Separation membrane 121 is made by compatible material, and it is optionally compatible with n-paraffin (reduce by force composition).Like this, n-paraffin is pooled to Separation membrane 121 and the pore by Separation membrane, therefore, can separate n-paraffin selectively.
As long as Separation membrane can have needed separating property, Separation membrane is preferably thin as far as possible.In this case, in order to improve the intensity of Separation membrane 121, preferably have in first carrier and second carrier at least one.First carrier supports a side of Separation membrane 121, and second carrier supports relative (in addition) side of Separation membrane 121.
Therefore, can optionally n-paraffin be added in the waste gas effectively.In this, 2004-27881 number disclosed conventional art of the present invention and Japanese uncensored patent publications is different, and it is that the whole compositions in the fuel are all added (application) in waste gas, and no matter the reducing capacity of every kind of composition in the fuel.
Get back to the present invention, shown in Fig. 5,6, the diameter of carrier 122 each pore is significantly greater than the diameter of Separation membrane 121 each pore.Therefore, Separation membrane 121 mainly separates n-paraffin from light oil.Carrier 122 is positioned at the directly surface of contact of contact waste gas of separator 12, so the pore of Separation membrane 121 is subjected in the waste gas particulate matter chocking-up degree limited.Therefore, this characteristic helps to keep for a long time the separating property of Separation membrane 121.
The resid oil stream of the light oil behind the separation n-paraffin is crossed separator 12, and is recovered in the fuel tank by bindiny mechanism 132, Oil residue recuperation port one 31 and Oil residue recuperation passage 22.Therefore, can be effectively with the fuel of Residual oil as internal-combustion engine, this is the initial purpose of light oil.
In said structure, can apace isolated strong reduction composition be added in the waste gas.
The controlling method of this waste gas cleaning plant is described in conjunction with Fig. 7.Control to this device is realized by ECU 70.ECU 70 also controls this device according to the working state (for example, rotational velocity, fuel injection amount) of diesel engine 60 according to the information that temperature transducer 71 and NOx sensor 72 provide.Here, the temperature of temperature transducer 71 sensing waste gas, the concentration of NOx in the NOx sensor 72 sensing waste gas.
Motor is after starting in the step S1, and temperature transducer 71 is measured exhaust gas temperature in step S2.In step S3, judge that the temperature that measures equals or be higher than the boiling temperature of light oil (specifically, being the boiling temperature of the n-paraffin of the strong reduction of conduct composition in the light oil).When exhaust gas temperature is not the evaporating temperature of permission light oil evaporation (when exhaust gas temperature is lower than the light oil boiling point), control circle is got back to step S2.When exhaust gas temperature is evaporating temperature, proceed next step control.
When exhaust gas temperature is evaporating temperature, in step S4, measure engine speed, in step S5, obtain fuel injection amount information.According to above-mentioned information, estimate the concentration of NOx in exhaust gas discharging amount and the waste gas, thereby in step S6, estimate the discharge amount of NOx.NOx concentration in fact also can be measured by the NOx sensor that is installed in 31 li of exhaust steam passages, rather than estimates NOx concentration according to working state.Also have, also can estimate the discharge amount of NOx according to the corresponding relation that comes out by experimental calculation in advance.
In step S7, calculate accordingly the NOx discharge amount that estimates is reduced and purified the amount of needed reducing agent.In step S8, determine the discharge-amount of pump 20, thereby the reducing agent of amount of calculation can be added in the waste gas.The light oil discharge-amount of pump 20 and can come out for the corresponding relation between the reducing agent use amount of waste gas according to experimental calculation in advance so just can be determined the discharge-amount of light oil.
In step S9, pump 20 so just can offer the light oil that comprises a large amount of n-paraffin separator 12 according to above-mentioned definite discharge-amount work.The result is to have increased the amount of the n-paraffin that can separate by Separation membrane 121, thereby increased the amount of the n-paraffin that adds in the waste gas.In purification of nitrogen oxides catalyst 40, the n-paraffin and the nitrogen oxide that add in the waste gas react, and make nitrogen oxide obtain reduction and purification.
Then, in step S10, measure NOx concentration in exhaust steam passage 33, passage 33 is positioned at downstream one side of purification of nitrogen oxides catalyst 40.When the concentration of definite NOx was equal to or less than predetermined value in step S11, control flow turned back to step S2, so that recover control from the outset.When the concentration of NOx is not equal to or during less than predetermined value, the discharge-amount of pump 20 is set to higher in step S12.Then, control flow is got back to step S9, so that pump 20 is according to the discharge-amount work that increases.
When being noted that the discharge-amount that increases pump 20 in step S12, preferably revise the corresponding relation between light oil discharge-amount and the reducing agent use amount accordingly, this relation is used for determining the discharge-amount of pump 20 in step S8.For example, can revise corresponding relation between discharge-amount and the reducing agent use amount by corrected value that change to proofread and correct corresponding relation.Under the situation of revising corresponding relation, also need treatment step to be used to reduce discharge-amount.For example, several steps can be arranged, these steps can be described to " when control from step S11 to step S12 (step S2) when a succession of continuous n time or more times, discharge-amount one prearranging quatity of increase (minimizing) pump 20 ".
The following describes first modification of present embodiment.Except the Separation membrane and carrier opposed alignment of separator, the waste gas cleaning plant in this modification comprises structure same as the previously described embodiments, by identical method of work work.Specifically, the Separation membrane 121 of separator 12 forms on the peripheral surface of carrier 122.Because said structure, Separation membrane directly contacts waste gas, makes the temperature of Separation membrane can follow exhaust gas temperature apace.Like this, can isolate strong reduction composition fast.Here, can make thicklyer or the material of Separation membrane 121 can change at Separation membrane 121, thereby can improve under the situation of Separation membrane 121 intensity, carrier is optional.
In addition, make for convenience, can the light fluidizing oil passage can be used for the exhaust flow that reducing agent adds facility with the exhaust flow passage as the light fluidizing oil passage.In addition, as shown in Figure 8, also Separation membrane 121 can be formed convex-concave shape (shape, corrugated for example rise and fall), area of contact is increased.Therefore can improve separation effect.
Further, be positioned at carrier 122 under the situation on the surface of contact of separator contact waste gas, the selective reduction catalyst that is used for nitrogen oxides reduction can be carried by carrier 122, thereby carrier 122 also serves as the purification of nitrogen oxides catalyst.
The foregoing description has been described an example, wherein the reducing agent of introducing diesel engine as the light oil of fuel is added in the facility 10.When changing poor combustion petrol engine into, can introduce reducing agent as the gasoline of fuel and add in the facility 10.
The following describes second modification of first embodiment.Also alcohol, alcohol fuel and rock gas can be used as the mixture of two or more compositions (promptly strong reduction composition and at least a other composition), rather than use motor fuel, such as light oil.
(second embodiment)
Second embodiment's waste gas cleaning plant purifies the waste gas of discharging as the diesel engine of internal-combustion engine.The waste gas cleaning plant of present embodiment is described below with reference to Fig. 9.In Fig. 9 with first embodiment's waste gas cleaning plant in have similar effect some similar assemblies, represent with identical numeral.
As shown in Figure 9, the waste gas cleaning plant of present embodiment comprises exhaust steam passage 33,34, and purification of nitrogen oxides (reduction) catalyst 40 and reducing agent add facility (reducing agent interpolation module) 10.The waste gas of discharging from diesel engine 60 passes through exhaust steam passage 33,34.Purification of nitrogen oxides catalyst 40 is installed in 33,34 li of exhaust steam passages.Reducing agent adds facility 10 and is connected with reducing agent interpolation passage 11,13, makes gaseous emission (being that gaseous emission (application) is to the exhaust steam passage 34 that is positioned at purification of nitrogen oxides catalyst 40 upstreams) in the exhaust steam passage 34 between motor 60 and purification of nitrogen oxides catalyst 40.Purification of nitrogen oxides catalyst 40 and reducing agent add facility 10, and each all constitutes the part of exhaust steam passage.
Air by fan 82 and radiator 81 is offered reducing agent add facility 10.Reduction composition service duct comprises that reducing agent adds facility 10 by force, and reducing agent adds passage 11,13 and the inhibition mechanism 14 that refluxes, and the purpose that installing refluxes suppresses mechanism 14 is that restriction waste gas is back to the reducing agent interpolation facility 10 from exhaust steam passage.The freezing mixture of diesel engine 60 is recycled in the radiator 81 through coolant channel 83,84.
Further specifying some elements will be omitted, such as pump 20, purification of nitrogen oxides catalyst 40, fuel tank 50, diesel engine 60, ECU 70 and peripheral unit thereof, all these use with first embodiment in those identical numerals because these elements general all to first embodiment in describe those are similar.
The same substantially among the general structure that reducing agent adds facility 10 among second embodiment and first embodiment, this structure is utilized the strong reduction composition in the Separation membrane separation fuel.But, with the air of heating as introducing and the high-temperature gas of contact separation diaphragm one side.Here, the air of heating is by radiator 81, therefore is by the waste heat of diesel engine 60.
The following describes effect.Because said structure, the waste gas cleaning plant of present embodiment can obtain the effect identical with first embodiment's waste gas cleaning plant.Describe the difference that is different from first embodiment below in detail.
Being installed in the heat that reducing agent adds the high-temperature gas that the Separation membrane in the facility 10 heat by radiator 81 heats.Like this, the temperature of Separation membrane is improved, and makes to have only the n-paraffin as strong reduction composition to separate from light oil.After separating, isolated strong reduction composition is along with high temperature gas flow inflow exhaust gas passage., be higher than pressure in the strong reduction composition service duct (reducing agent interpolation passage) 11,13 here, reflux and suppress mechanism 14 and also can limit waste gas and flow into reducing agent and add in facility 10 and the radiator 81 even the pressure in the exhaust steam passage becomes.Therefore, the undressed waste gas that does not purify can not leak out.
10 direct contact waste gas are restricted because reducing agent adds facility, so the waste gas cleaning plant of present embodiment has limited exhaust gases (for example, because the obstruction of the Separation membrane that the particulate matter in the waste gas causes).
The following describes first modification of second embodiment.Also the gas (air) of the mechanism heats of back can be used for replacing air, as offering the high-temperature gas that reducing agent adds facility 10 by radiator 81.For example, replace come as high-temperature gas be air, these air are by exhaust steam passage 33,34 heating, the waste gas of diesel engine 60 is through these passages.Air can be introduced the outside of contact exhaust steam passage 33,34, thus heated air.
In addition, replace using high-temperature gas, also can come heating and separating diaphragm itself with a kind of method, for example, in this way, the heat of waste gas can be transmitted to Separation membrane.So, the Separation membrane of gas at normal temperature (may be high-temperature gas) by heating, thus can separate strong reduction composition and offer gas.
Those skilled in the art are easy to expect additional advantage and improvement.Therefore in a broad aspect, the illustrative example that the present invention is not limited to these details, representative device and illustrates and describe.
Claims (29)
1. waste gas cleaning plant comprises:
Exhaust steam passage (31,32,33), the exhaust flow of internal-combustion engine (60) is crossed this exhaust steam passage;
Purification of nitrogen oxides catalyst (40) is positioned at the random position of described exhaust steam passage (31,32), and wherein said purification of nitrogen oxides catalyst (40) utilizes reducing agent to purify described nitrogen oxides from exhaust gas; And
Reducing agent adds module (10), is used for adding described reducing agent to described exhaust steam passage (32,34), is positioned at exhaust flow to the upstream of the above purification of nitrogen oxides catalyst (a 40) side, wherein:
Described reducing agent adds module (10) and comprises the reducing agent separation module, is used for utilizing heat to separate strong reduction composition from mixture, and this mixture has described strong reduction composition and at least a other composition; And
The described strong reduction composition of being separated by described reducing agent separation module serves as described reducing agent.
2. waste gas cleaning plant as claimed in claim 1, wherein said reducing agent interpolation module (10) as described heat, is isolated described strong reduction composition with waste-gas heat from described mixture.
3. waste gas cleaning plant as claimed in claim 1 or 2, wherein said mixture comprises the fuel that is used for described internal-combustion engine (60).
4. waste gas cleaning plant as claimed in claim 3 also comprises:
Mixture supply module (20) is used for supplying described mixture from the mixture case (50) of storing described mixture to described reducing agent separation module; And
Mixture recycle module (22) is used for residue is recycled to described mixture case (50), and wherein said residue produces after by described reducing agent separation module described strong reduction composition being separated from described mixture.
5. waste gas cleaning plant as claimed in claim 1, wherein said reducing agent separation module comprises Separation membrane (121), introducing the side that described mixture contacts described Separation membrane (121), introduce simultaneously under the state of opposite side that high-temperature gas contacts described Separation membrane (121), described Separation membrane (121) separates described strong reduction composition from described mixture.
6. waste gas cleaning plant as claimed in claim 2, wherein said reducing agent separation module comprises Separation membrane (121), introducing the side that described mixture contacts described Separation membrane (121), introduce simultaneously under the state of opposite side that described waste gas contacts described Separation membrane (121), described Separation membrane (121) separates described strong reduction composition from described mixture.
7. waste gas cleaning plant as claimed in claim 5, wherein said Separation membrane (121) is poor based on the molecular dimension of described strong reduction composition and described at least a other composition, separates described strong reduction composition from described mixture.
8. waste gas cleaning plant as claimed in claim 6, wherein said Separation membrane (121) is poor based on the molecular dimension of described strong reduction composition and described at least a other composition, separates described strong reduction composition from described mixture.
9. waste gas cleaning plant as claimed in claim 7, wherein said Separation membrane (121) comprises permeability hole, the diameter of this permeability hole is controlled in 0.39nm between the 0.57nm.
10. waste gas cleaning plant as claimed in claim 8, wherein said Separation membrane (121) comprises permeability hole, the diameter of this permeability hole is controlled in 0.39nm between the 0.57nm.
11. waste gas cleaning plant as claimed in claim 7, wherein said Separation membrane (121) comprises zeolite.
12. waste gas cleaning plant as claimed in claim 8, wherein said Separation membrane (121) comprises zeolite.
13. waste gas cleaning plant as claimed in claim 5, wherein:
Described Separation membrane (121) comprises a kind of material, this material has first compatibility to described strong reduction composition, and have at least one second compatibility, it is compatible with corresponding a kind of composition of described at least a other composition that each of described second compatibility shows; And
Described first compatibility is different from described at least one second compatibility.
14. waste gas cleaning plant as claimed in claim 6, wherein:
Described Separation membrane (121) comprises a kind of material, this material has first compatibility to described strong reduction composition, and have at least one second compatibility, it is compatible with corresponding a kind of composition of described at least a other composition that each of described second compatibility shows; And
Described first compatibility is different from described at least one second compatibility.
15. waste gas cleaning plant as claimed in claim 5, wherein said reducing agent separation module (12) comprise following one of at least:
Support the porous carrier (122) of the described side of described Separation membrane (121); With
Support the porous carrier (122) of the described opposite side of described Separation membrane (121).
16. waste gas cleaning plant as claimed in claim 6, wherein said reducing agent separation module (12) comprise following one of at least:
Support the porous carrier (122) of the described side of described Separation membrane (121); With
Support the porous carrier (122) of the described opposite side of described Separation membrane (121).
17. waste gas cleaning plant as claimed in claim 5, wherein:
Described reducing agent separation module comprises hollow separator (12), this hollow separator (12) is arranged in described exhaust steam passage (31,32), make a inside that flows into described separator (12) in described waste gas and the described mixture, the another one in described waste gas and the described mixture centers on the outer flow mistake of described separator (12); And
The described inside of described separator (12) and at least a portion on the border between the described outside are formed by described Separation membrane (121).
18. waste gas cleaning plant as claimed in claim 6, wherein
Described reducing agent separation module comprises hollow separator (12), this hollow separator (12) is arranged in described exhaust steam passage (31,32), make a inside that flows into described separator (12) in described waste gas and the described mixture, the another one in described waste gas and the described mixture centers on the outer flow mistake of described separator (12); And
The described inside of described separator (12) and at least a portion on the border between the described outside are formed by described Separation membrane (121).
19., also comprise as claim 17 or 18 described waste gas cleaning plantes:
Mixture supply module (20) is used for supplying described mixture from the mixture case (50) of storing described mixture to described reducing agent separation module; And
Mixture recycle module (22) is used for residue is recycled to described mixture case (50), and wherein said residue produces after by described reducing agent separation module described strong reduction composition being separated from described mixture.
20. waste gas cleaning plant as claimed in claim 19, wherein:
Described mixture supply module (20) is supplied described mixture by an end of described separator (12); And
Described mixture recycle module (22) is recycled to described leftovers in the described mixture case (50) by the other end of described separator (12).
21. waste gas cleaning plant as claimed in claim 17, wherein said separator (12) are at the tubular member of described exhaust flow to middle extension.
22. waste gas cleaning plant as claimed in claim 18, wherein said separator (12) are at the tubular member of described exhaust flow to middle extension.
23. waste gas cleaning plant as claimed in claim 1, wherein said strong reduction composition is a n-paraffin.
24. an exhaust gas purifying method comprises:
To have strong reduction composition and at least a other mixture of ingredients and introduce a side of Separation membrane (121), wherein said Separation membrane (121) comprises the selectively penetrating hole, and this permeability hole allows to have in the described mixture the described strong reduction composition infiltration of less relatively molecular dimension selectively by described selectively penetrating hole; And
Introduce waste gas and contact the opposite side of described Separation membrane (121), thereby from described mixture, isolate described strong reduction composition, and isolated described strong reduction composition is added in the described waste gas.
25. exhaust gas purifying method as claimed in claim 24, wherein said Separation membrane (121) are arranged in upstream one side of exhaust steam passage (31,32) the purification of nitrogen oxides catalysts (40) that extend out from internal-combustion engine (60).
26. an exhaust gas purifying method comprises:
To have strong reduction composition and at least a other mixture of ingredients and introduce a side of Separation membrane (121), wherein said Separation membrane (121) allows the described strong reduction composition infiltration in the described mixture to pass through described Separation membrane (121) selectively; And
Introduce high-temperature gas and contact the opposite side of described Separation membrane (121), thereby from described mixture, isolate described strong reduction composition, and isolated described strong reduction composition is added in the described high-temperature gas.
27. exhaust gas purifying method as claimed in claim 26, wherein said Separation membrane (121) is arranged in upstream one side of strong reduction composition service duct (11,13,14) purification of nitrogen oxides catalysts (40), thereby described high-temperature gas is supplied to the exhaust steam passage (34) that extends out from internal-combustion engine (60).
28. exhaust gas purifying method as claimed in claim 26, wherein said high-temperature gas are what to be used to from the waste heat of internal-combustion engine (60).
29. as any one described exhaust gas purifying method in the claim 24 to 28, wherein said mixture comprises the fuel that is used for internal-combustion engine (60).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP236684/2005 | 2005-08-17 | ||
| JP2005236684 | 2005-08-17 | ||
| JP141685/2006 | 2006-05-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1916379A CN1916379A (en) | 2007-02-21 |
| CN100416056C true CN100416056C (en) | 2008-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101148730A Expired - Fee Related CN100416056C (en) | 2005-08-17 | 2006-08-16 | Exhaust gas cleaning device and its method |
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| CN (1) | CN100416056C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4764463B2 (en) * | 2008-09-22 | 2011-09-07 | 株式会社日本自動車部品総合研究所 | Exhaust gas purification control device and exhaust gas purification system for internal combustion engine |
| JP6996432B2 (en) * | 2018-06-20 | 2022-02-04 | トヨタ自動車株式会社 | CO2 separation system for mounting on vehicles that use an internal combustion engine as power |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4867953A (en) * | 1985-02-16 | 1989-09-19 | Kraftanlagen Ag | Method for the selective elimination of nitrogen oxides from exhaust gases |
| EP0505882A1 (en) * | 1991-03-28 | 1992-09-30 | Siemens Aktiengesellschaft | Process and apparatus for catalytic reduction |
| CN1187778A (en) * | 1995-06-28 | 1998-07-15 | 西门子公司 | Catalytic purification process and device for exhaust gas from combustion system |
| US6662552B1 (en) * | 1999-05-19 | 2003-12-16 | Daimlerchrysler Ag | Exhaust-gas cleaning system and method with internal ammonia generation, for the reduction of nitrogen oxides |
| US6892529B2 (en) * | 2002-02-25 | 2005-05-17 | Daimlerchrysler Ag | Exhaust-gas purification system for an internal combustion engine |
-
2006
- 2006-08-16 CN CNB2006101148730A patent/CN100416056C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4867953A (en) * | 1985-02-16 | 1989-09-19 | Kraftanlagen Ag | Method for the selective elimination of nitrogen oxides from exhaust gases |
| EP0505882A1 (en) * | 1991-03-28 | 1992-09-30 | Siemens Aktiengesellschaft | Process and apparatus for catalytic reduction |
| CN1187778A (en) * | 1995-06-28 | 1998-07-15 | 西门子公司 | Catalytic purification process and device for exhaust gas from combustion system |
| US6662552B1 (en) * | 1999-05-19 | 2003-12-16 | Daimlerchrysler Ag | Exhaust-gas cleaning system and method with internal ammonia generation, for the reduction of nitrogen oxides |
| US6892529B2 (en) * | 2002-02-25 | 2005-05-17 | Daimlerchrysler Ag | Exhaust-gas purification system for an internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1916379A (en) | 2007-02-21 |
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