CN114762796B - Nitrogen oxide purification device and vehicle - Google Patents
Nitrogen oxide purification device and vehicle Download PDFInfo
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- CN114762796B CN114762796B CN202110056835.9A CN202110056835A CN114762796B CN 114762796 B CN114762796 B CN 114762796B CN 202110056835 A CN202110056835 A CN 202110056835A CN 114762796 B CN114762796 B CN 114762796B
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- vanadium pentoxide
- cerium
- purification
- active compound
- compound layer
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 289
- 238000000746 purification Methods 0.000 title claims abstract description 42
- GNTDGMZSJNCJKK-UHFFFAOYSA-N divanadium pentaoxide Chemical compound O=[V](=O)O[V](=O)=O GNTDGMZSJNCJKK-UHFFFAOYSA-N 0.000 claims abstract description 140
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000000654 additive Substances 0.000 claims abstract description 20
- 230000000996 additive effect Effects 0.000 claims abstract description 20
- 150000001875 compounds Chemical class 0.000 claims abstract description 20
- 238000010926 purge Methods 0.000 claims abstract description 11
- 230000003313 weakening effect Effects 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 5
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 claims description 34
- 239000002131 composite material Substances 0.000 claims description 30
- 229910052684 Cerium Inorganic materials 0.000 claims description 27
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 26
- OZECDDHOAMNMQI-UHFFFAOYSA-H cerium(3+);trisulfate Chemical compound [Ce+3].[Ce+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O OZECDDHOAMNMQI-UHFFFAOYSA-H 0.000 claims description 11
- 238000005728 strengthening Methods 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 19
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052921 ammonium sulfate Inorganic materials 0.000 abstract description 17
- 235000011130 ammonium sulphate Nutrition 0.000 abstract description 16
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 15
- 229910001868 water Inorganic materials 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 18
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 16
- 229910021529 ammonia Inorganic materials 0.000 description 13
- 230000000694 effects Effects 0.000 description 11
- 150000003568 thioethers Chemical class 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 229910000333 cerium(III) sulfate Inorganic materials 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- -1 SO 2 and SO 3 Chemical class 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Classifications
-
- 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
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9422—Processes characterised by a specific catalyst for removing nitrogen oxides by NOx storage or reduction by cyclic switching between lean and rich exhaust gases (LNT, NSC, NSR)
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/20—Metals or compounds thereof
- B01D2255/207—Transition metals
- B01D2255/20723—Vanadium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
The invention provides a nitrogen oxide purifying device and a vehicle, comprising: a housing having an inlet and an outlet, and a purge carrier disposed within the housing; an active compound layer is arranged on the inner surface of the pore canal of the purification carrier; wherein the components of the active compound layer comprise vanadium pentoxide and additive components; in the process of purifying the nitrogen oxides entering through the inlet of the shell by the purifying carrier, the active compound layer is used for reducing the reaction intensity of the vanadium pentoxide and the sulfide based on the additive components, weakening the reaction of the vanadium pentoxide and the sulfide to generate acid ammonium sulfate and ammonium sulfate, avoiding the surface of the vanadium pentoxide from being covered by the acid ammonium sulfate and the ammonium sulfate so as to store ammonia gas by the vanadium pentoxide, enabling the nitrogen oxides and the ammonia gas to react to generate nitrogen and water, completing the purification of the nitrogen oxides, enabling the vanadium pentoxide to play the self-purification role of the nitrogen oxides, and improving the purification efficiency of the nitrogen oxides.
Description
Technical Field
The invention relates to the technical field of vehicle control, in particular to a nitrogen oxide purifying device and a vehicle.
Background
The diesel engine has the characteristics of high thermal efficiency and oil saving, but the emission pollution of the generated particulate matters (Particulate Matter, PM, particulate matters, mainly carbon particles) is a primary obstacle affecting the popularization and the use of the diesel engine. With the upgrading of emission standards for light diesel vehicles, the emission limits for PM and nitrogen oxides (NO X) are being tightened.
Currently, there are mainly two post-treatment arrangements for light diesel vehicles, both of which are arranged with a Selective Catalytic Reduction (SCR) system or SDPF (a diesel particulate trap (Diesel Particulate Filter, DPF) with ammonia storage capability). Among them, SCR or SDPF is a device for purifying NO X, in which vanadium pentoxide (V 2O5) is the most main active component thereof, purification of NO X can be achieved.
However, sulfur (S) exists in diesel oil, and the S can react with oxygen (O 2) to generate sulfur dioxide (SO 2),SO2 can react with O 2 to generate sulfur trioxide (SO 3),SO2 and SO 3 can further generate sulfides and are attached to the surface of V 2O5, SO that V 2O5 cannot act, further the NO X purifying effect is poor, further, the conversion efficiency of light diesel oil automobile to nitrogen oxides cannot meet the emission limit, and the emission of the whole automobile is disqualified.
Disclosure of Invention
In view of this, the present invention aims to provide a purifying device for nitrogen oxides and a vehicle, SO as to solve the problems that the existing SO 2 and SO 3 can further generate sulfides and adhere to the surface of V 2O5, which results in NO effect of V 2O5, NO X purifying effect is further poor, and further, the conversion efficiency of light diesel vehicle to nitrogen oxides cannot meet the emission limit, thereby resulting in disqualification of the emission of the whole vehicle.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a purifying apparatus for nitrogen oxides, the apparatus including:
A housing having an inlet and an outlet, and a purge carrier disposed within the housing;
An active compound layer is arranged on the inner surface of the pore canal of the purification carrier;
Wherein the components of the active compound layer comprise vanadium pentoxide and additive components; the components of the additive component comprise tungsten trioxide and/or cerium;
the active composite layer is used to complete the purification of nitrogen oxides based on the additive component during the purification of nitrogen oxides entering through the inlet of the housing by the purification carrier.
Optionally, the mass ratio of the tungsten trioxide in the active composite layer is greater than or equal to five percent of the mass ratio of the vanadium pentoxide in the active composite layer, and less than or equal to ten percent of the mass ratio of the vanadium pentoxide content in the active composite layer.
Optionally, the mass ratio of cerium in the active composite layer is greater than or equal to five percent of the mass ratio of vanadium pentoxide in the active composite layer, and less than or equal to twelve percent of the mass ratio of vanadium pentoxide content in the active composite layer.
Optionally, the method further comprises:
And a gasket disposed between the housing and the purge carrier.
Optionally, the housing comprises a first connecting pipe section, a first expansion section, a main body section, a second expansion section and a second connecting pipe section in sequence from the inlet to the outlet in the longitudinal direction, and the purification carrier is arranged in the main body section.
Optionally, the first expansion section and the second expansion end are both structures with gradually increased inner diameters from one section to the other end, and the ends with larger inner diameters of the first expansion section and the second expansion section face the main body section.
Optionally, the active composite layer is configured to: and strengthening the reaction tendency of the vanadium pentoxide to the ammonia gas based on the tungsten trioxide, and weakening the reaction of the vanadium pentoxide and the sulfide.
Optionally, the active composite layer is configured to: generating cerium sulfate by reacting the cerium with the sulfide;
And reducing to obtain the cerium based on the reducibility of the cerium sulfate, and weakening the reaction between the vanadium pentoxide and the sulfide.
Optionally, the active composite layer is configured to: and (2) strengthening the reaction tendency of the vanadium pentoxide to the ammonia gas based on the tungsten trioxide, reacting the cerium with the sulfide to generate cerium sulfate, and reducing to obtain the cerium based on the reducibility of the cerium sulfate, so that the reaction of the vanadium pentoxide with the sulfide is weakened.
In a second aspect, an embodiment of the present invention provides a vehicle, including a purifying apparatus for nitrogen oxides according to the first aspect.
Compared with the prior art, the embodiment of the invention has the following advantages:
In the nitrogen oxide purifying device provided by the embodiment of the invention, in the process of purifying the nitrogen oxide entering through the inlet of the shell by the purifying carrier, the active compound layer is used for reducing the reaction strength of the vanadium pentoxide and the sulfide based on the additive component, namely, weakening the reaction of the vanadium pentoxide and the sulfide to generate the acid ammonium sulfate (NH 4HSO4) and the ammonium sulfate ((NH 4)2SO4), further, the surface of the vanadium pentoxide can be prevented from being covered by the acid ammonium sulfate and the ammonium sulfate so as to store ammonia by the vanadium pentoxide, and the nitrogen oxide and the ammonia react to generate nitrogen and water, so that the nitrogen oxide is purified, the purifying effect of the vanadium pentoxide on the nitrogen oxide can be exerted, the purifying efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle on the nitrogen oxide can meet the emission limit, and the emission of the whole vehicle is qualified.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 shows a schematic layout of a light-duty diesel vehicle provided by the related art;
FIG. 2 shows another light duty diesel vehicle layout schematic provided by the related art;
Fig. 3 is a schematic structural view of a purifying apparatus for nitrogen oxides according to a first embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a purifying apparatus for nitrogen oxides according to a second embodiment of the present invention.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Before explaining the nitrogen oxide purifying device provided by the embodiment of the present invention, an application scenario of the nitrogen oxide purifying device provided by the embodiment of the present invention is specifically described:
the emission of PM is reduced by adding a diesel particle catcher (Diesel Particulate Filter, DPF), which is one of the most effective means at present, and the purification efficiency can reach more than 90%. Referring to fig. 1, which illustrates a schematic layout of a light diesel vehicle provided by the related art, as shown in fig. 1, the light diesel vehicle may include: post-supercharger exhaust port 01, nitrogen oxide Trap (LeanNO X Trap, LNT) 02, urea nozzle 03, diesel particulate Trap (Diesel Particulate Filter, DPF) 04, and selective catalytic Reduction system (SELECTIVE CATALYST Reduction, SCR) 05. Wherein, light-duty diesel car still includes: a high temperature sensor 06, a nitrogen-oxygen sensor 07, an oxygen sensor 08, and a differential pressure sensor 09.
Referring to fig. 2, there is shown another light diesel vehicle arrangement schematic diagram provided by the related art, as shown in fig. 2, the light diesel vehicle may include: an engine 10, a nitrogen oxide trap (LNT) 02 or a diesel oxidation catalyst (Diesel oxidation catalyst, DOC) 11, a urea nozzle 03, a diesel particulate trap (SDPF, a DPF provided with an SCR coating) 12 and a selective catalytic reduction System (SCR) 05. Wherein, light-duty diesel car still includes: a high temperature sensor 06, a nitrogen-oxygen sensor 07, an oxygen sensor 08, and a differential pressure sensor 09.
In SCR or SDPF, vanadium pentoxide (V 2O5) is the most predominant active component, and purification of NO X can be achieved.
However, sulfur (S) is present in diesel, and S can react with oxygen (O 2) to produce sulfur dioxide (SO 2),SO2 can react with O 2 to produce sulfur trioxide (SO 3),SO2 and SO 3 can further produce sulfides. NH 3 reactions with nitrogen oxides in SCR or SDPF include:
2NH3+NO+NO2→2N2+3H2O(1)；
8NH3+6NO2→7N2+12H2O(2)；
4NH3+4NO+O2→4N2+6H2O(3)。
the primary function of SCR or SDPF is to purify nitrogen oxides (NO X),V2O5 is the primary active ingredient, but V 2O5 is susceptible to contamination by sulfides such as SO 2 and SO 3, the contaminated forms including ammonium acid sulfate (NH 4HSO4) and ammonium sulfate ((NH 4)2SO4), the reaction equations including:
S+O2→SO2(4)；
2SO2+O2→2SO3(5)；
SO3+NH3+H2O→NH4HSO4(6)；
SO3+2NH3+H2O→(NH4)2SO4(7)。
And attach on V 2O5 surface, lead to V 2O5 unable effect, further lead to NO X purifying effect not good, further, will lead to light-duty diesel car to the emission limit can not be satisfied to nitrogen oxide conversion efficiency to the emission disqualification of whole car is led to. The nitrogen oxide purifying device provided by the embodiment of the invention is applied to the scene.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 3, a schematic structural diagram of a nitrogen oxide purifying apparatus according to a first embodiment of the present invention is shown, and as shown in fig. 3, the nitrogen oxide purifying apparatus 20 includes:
a housing 201 having an inlet 201a and an outlet 201b, and a purge carrier 202, the purge carrier 202 being disposed inside the housing 201;
The inner surface of the pore canal of the purification carrier 202 is provided with an active compound layer 203;
wherein the components of the active composite layer 203 include vanadium pentoxide and additive components; the components of the additive component comprise tungsten trioxide and/or cerium;
the active composite layer 203 is used to complete the purification of nitrogen oxides based on the additive component during the purification of nitrogen oxides entering through the inlet of the housing 201 by the purification carrier 202.
Specifically, in the process of purifying the nitrogen oxide entering through the inlet of the housing 201 by the purifying carrier 202, the active compound layer 203 is used for reducing the reaction strength of the vanadium pentoxide and the sulfide based on the additive component, so that more of the vanadium pentoxide adsorbs ammonia, and the nitrogen oxide and the ammonia react to generate nitrogen and water, thereby completing the purification of the nitrogen oxide.
In the present application, the nitrogen oxide purification device may be SCR or SDPF.
In the nitrogen oxide purifying device provided by the embodiment of the invention, in the process of purifying the nitrogen oxide entering through the inlet of the shell by the purifying carrier, the active compound layer is used for reducing the reaction strength of the vanadium pentoxide and the sulfide based on the additive component, namely, weakening the reaction of the vanadium pentoxide and the sulfide to generate the acid ammonium sulfate (NH 4HSO4) and the ammonium sulfate ((NH 4)2SO4), further, the surface of the vanadium pentoxide can be prevented from being covered by the acid ammonium sulfate and the ammonium sulfate so as to store ammonia by the vanadium pentoxide, and the nitrogen oxide and the ammonia react to generate nitrogen and water, so that the nitrogen oxide is purified, the purifying effect of the vanadium pentoxide on the nitrogen oxide can be exerted, the purifying efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle on the nitrogen oxide can meet the emission limit, and the emission of the whole vehicle is qualified.
Referring to fig. 4, a schematic structural diagram of a nitrogen oxide purifying apparatus according to a second embodiment of the present invention is shown, and as shown in fig. 4, the nitrogen oxide purifying apparatus 20 includes:
a housing 201 having an inlet 201a and an outlet 201b, and a purge carrier 202, the purge carrier 202 being disposed inside the housing 201;
The inner surface of the pore canal of the purification carrier 202 is provided with an active compound layer 203;
Wherein the components of the active composite layer 203 include vanadium pentoxide and additive components; the components of the additive component comprise tungsten trioxide and/or cerium
The active composite layer 203 is used to complete the purification of nitrogen oxides based on the additive component during the purification of nitrogen oxides entering through the inlet of the housing 201 by the purification carrier 202.
Specifically, in the process of purifying the nitrogen oxide entering through the inlet of the housing 201 by the purifying carrier 202, the active compound layer 203 is used for reducing the reaction strength of the vanadium pentoxide and the sulfide based on the additive component, so that more of the vanadium pentoxide adsorbs ammonia, and the nitrogen oxide and the ammonia react to generate nitrogen and water, thereby completing the purification of the nitrogen oxide.
Optionally, referring to fig. 3, the purifying apparatus for nitrogen oxides further includes: a gasket 204 disposed between the housing 201 and the purge carrier 202.
Wherein, the liner can play the guard action of guaranteeing leakproofness and shock attenuation.
Optionally, the housing comprises a first connecting pipe section, a first expansion section, a main body section, a second expansion section and a second connecting pipe section in sequence from the inlet to the outlet in the longitudinal direction, and the purification carrier is arranged in the main body section.
Optionally, the first expansion section and the second expansion section are both in structures with inner diameters gradually increasing from one section to the other end, and the ends with larger inner diameters of the first expansion section and the second expansion section face the main body section, so that the main body section has a larger inner diameter, that is, a larger internal use space, and can accommodate the purification carrier, so that the air flow flowing through the main body section can sufficiently react in the purification carrier.
Optionally, the additive component includes: tungsten trioxide and/or cerium.
Optionally, the active composite layer is configured to: and strengthening the reaction tendency of the vanadium pentoxide to the ammonia gas based on the tungsten trioxide, and weakening the reaction of the vanadium pentoxide and the sulfide.
The adsorption capturing capacity of V 2O5 on sulfide (SO 2/SO3) and NH 3 is basically the same, V 2O5 can form an acid center in the process of treating NH 3, tungsten trioxide (WO 3) can promote the acidity of the acid center, the reaction tendency of V 2O5 to NH 3 can be further enhanced, the specific reaction of V 2O5 to sulfide is weakened, the quantity or probability of generating acidic ammonium sulfate and ammonium sulfate on the surface of V 2O5 by sulfide is weakened, ammonia gas is stored by vanadium pentoxide, the nitrogen oxide and the ammonia gas react to generate nitrogen and water, the purification of the nitrogen oxide is completed, the vanadium pentoxide can play the self-purifying function of the nitrogen oxide, the purifying efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle to the nitrogen oxide can meet the emission limit value, and the emission of the whole vehicle is qualified.
Optionally, the mass ratio of the tungsten trioxide in the active composite layer is greater than or equal to five percent of the mass ratio of the vanadium pentoxide in the active composite layer, and less than or equal to ten percent of the mass ratio of the vanadium pentoxide content in the active composite layer.
In the case where the mass ratio of the tungsten trioxide in the active composite layer is greater than or equal to nine percent of the mass ratio of the vanadium pentoxide in the active composite layer, the amount of the sulfide forming the acid ammonium sulfate and the ammonium sulfate on the surface of the vanadium pentoxide can be reduced by at least twelve percent.
Optionally, the active composite layer is configured to: generating cerium sulfate by reacting the cerium with the sulfide;
And reducing to obtain the cerium based on the reducibility of the cerium sulfate, and weakening the reaction between the vanadium pentoxide and the sulfide.
Cerium (Ce) is added in V 2O5 to form Ce 4+, when sulfide (SO 2/SO3) encounters NH 3、H2 O and Ce 4+, sulfide (SO 2/SO3) can react with Ce 4+ preferentially to form cerium sulfate (Ce 2(SO4)3), the quantity or probability of acid ammonium sulfate and ammonium sulfate generated by sulfide on the surface of V 2O5 is weakened, ammonia gas is stored in vanadium pentoxide, nitrogen gas and water are generated by reacting the nitrogen oxide with the ammonia gas, and nitrogen oxide purification is completed, SO that the vanadium pentoxide can exert the effect of purifying the nitrogen oxide, the nitrogen oxide purification efficiency is improved, the conversion efficiency of light diesel vehicles on the nitrogen oxide can meet the emission limit, and the emission of the whole vehicle is qualified.
It should be noted that, the formation process of Ce 2(SO4)3 is reversible, and specific reactions may include:
Ce2(SO4)3+2H2→2CeO2+2H2O+3SO2(8)；
Or alternatively Ce2(SO4)3+3H2+2O2→2CeO2+3H2O+3SO3(9);
Wherein SO 3 in equation (9) in the presence of H 2 produces SO 2 and H 2 O:
SO3+H2→H2O+SO2(10)。
Further, ceO 2 may be reduced to cerium (Ce), and for example, the reduction of CeO 2 to cerium (Ce) may be accomplished by carbon monoxide (CO), hydrocarbons (HC), hydrogen (H 2), and Nitric Oxide (NO), among others. The Ce can be recycled, the quantity or probability of generating acid ammonium sulfate and ammonium sulfate on the surface of V 2O5 by weakening sulfide can be ensured, so that the vanadium pentoxide can store ammonia, nitrogen oxide and ammonia react to generate nitrogen and water, the purification of nitrogen oxide is completed, the vanadium pentoxide can exert the purification effect of the vanadium pentoxide on the nitrogen oxide, the purification efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle on the nitrogen oxide can meet the emission limit value, and the emission of the whole vehicle is qualified.
Wherein, for SO 2, H 2 can be reacted to generate hydrogen sulfide (H 2 S) and H 2 O, and the specific reaction formula comprises:
SO2+3H2→2H2O+H2S(11)。
The hydrogen in the SCR or SDPF is substantially derived from the decomposition of water, and the reduction of Ce 2(SO4)3 to CeO 2 can be accomplished more fully by hydrolysis of water to produce the most hydrogen at 550 degrees celsius.
Optionally, the mass ratio of cerium in the active composite layer is greater than or equal to five percent of the mass ratio of vanadium pentoxide in the active composite layer, and less than or equal to twelve percent of the mass ratio of vanadium pentoxide content in the active composite layer.
Optionally, the active composite layer is configured to: and (2) strengthening the reaction tendency of the vanadium pentoxide to the ammonia gas based on the tungsten trioxide, reacting the cerium with the sulfide to generate cerium sulfate, and reducing to obtain the cerium based on the reducibility of the cerium sulfate, so that the reaction of the vanadium pentoxide with the sulfide is weakened.
According to the invention, tungsten trioxide and cerium can be added at the same time, so that the quantity or probability of generating acid ammonium sulfate and ammonium sulfate on the surface of V 2O5 by weakened sulfides can be further ensured, ammonia gas is stored by the vanadium pentoxide, the nitrogen oxide and the ammonia gas react to generate nitrogen and water, and the purification of the nitrogen oxide is completed, so that the vanadium pentoxide can exert the self purification effect on the nitrogen oxide, the purification efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle on the nitrogen oxide can meet the emission limit, and the emission of the whole vehicle is qualified.
For example, when the mass ratio of cerium in the active composite layer is greater than or equal to five percent of the mass ratio of vanadium pentoxide in the active composite layer and less than or equal to within twelve percent of the mass ratio of vanadium pentoxide in the active composite layer, the amount of ammonium acid sulfate and ammonium sulfate generated may be reduced by at least ten percent again on the basis of the addition of tungsten trioxide.
In the nitrogen oxide purifying device provided by the embodiment of the invention, in the process of purifying the nitrogen oxide entering through the inlet of the shell by the purifying carrier, the active compound layer is used for reducing the reaction strength of the vanadium pentoxide and the sulfide based on the additive component, namely, weakening the reaction of the vanadium pentoxide and the sulfide to generate the acid ammonium sulfate (NH 4HSO4) and the ammonium sulfate ((NH 4)2SO4), further, the surface of the vanadium pentoxide can be prevented from being covered by the acid ammonium sulfate and the ammonium sulfate so as to store ammonia by the vanadium pentoxide, and the nitrogen oxide and the ammonia react to generate nitrogen and water, so that the nitrogen oxide is purified, the purifying effect of the vanadium pentoxide on the nitrogen oxide can be exerted, the purifying efficiency of the nitrogen oxide is improved, the conversion efficiency of the light diesel vehicle on the nitrogen oxide can meet the emission limit, and the emission of the whole vehicle is qualified.
The embodiment of the invention also provides a vehicle, which comprises the nitrogen oxide purifying device.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
While alternative embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including alternative embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude that an additional identical element is present in an article or terminal device comprising the element.
While the foregoing has been described in some detail by way of illustration of the principles and embodiments of the invention, and while in accordance with the principles and implementations of the invention, those skilled in the art will readily recognize that the invention is not limited thereto.
Claims (5)
1. A nitrogen oxide purifying apparatus, comprising:
A housing having an inlet and an outlet, and a purge carrier disposed within the housing;
An active compound layer is arranged on the inner surface of the pore canal of the purification carrier;
wherein the components of the active compound layer comprise vanadium pentoxide and additive components; the additive component comprises tungsten trioxide and cerium, and the valence state of cerium added in vanadium pentoxide is Ce 4+;
the mass ratio of the tungsten trioxide in the active compound layer is greater than or equal to five percent of the mass ratio of the vanadium pentoxide in the active compound layer, and less than or equal to ten percent of the mass ratio of the vanadium pentoxide content in the active compound layer;
the mass ratio of cerium in the active compound layer is greater than or equal to five percent of the mass ratio of vanadium pentoxide in the active compound layer, and less than or equal to twelve percent of the mass ratio of vanadium pentoxide content in the active compound layer;
the active composite layer is for: strengthening the reaction tendency of the vanadium pentoxide to ammonia gas based on the tungsten trioxide, generating cerium sulfate by reacting the cerium with sulfide, and reducing the cerium based on the reducibility of the cerium sulfate to obtain the cerium, so that the cerium is recycled, and weakening the reaction of the vanadium pentoxide and the sulfide;
the active composite layer is used to complete the purification of nitrogen oxides based on the additive component during the purification of nitrogen oxides entering through the inlet of the housing by the purification carrier.
2. The apparatus as recited in claim 1, further comprising:
And a gasket disposed between the housing and the purge carrier.
3. The device of claim 1, wherein the housing comprises, in order, from the inlet to the outlet in a longitudinal direction, a first connecting tube segment, a first expanding segment, a main body segment, a second expanding segment, and a second connecting tube segment, the purge carrier being disposed within the main body segment.
4. The device of claim 3, wherein the first and second expansion segments each have a structure with an inner diameter that gradually increases from one end to the other, and wherein the larger inner diameters of the first and second expansion segments each have an end that faces the main body segment.
5. A vehicle comprising a nitrogen oxide purification apparatus according to any one of claims 1 to 4.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1593752A (en) * | 2004-07-01 | 2005-03-16 | 国电热工研究院 | Catalyst for generating station fume SCR denitration and preparation method thereof |
| CN103263912A (en) * | 2013-05-27 | 2013-08-28 | 四川中自尾气净化有限公司 | Diesel vehicle tail gas purifying catalyst and preparation method thereof |
| CN106975492A (en) * | 2017-04-09 | 2017-07-25 | 复旦大学 | One kind suppresses SO2Denitrating catalyst of oxidation and its preparation method and application |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2922594A1 (en) * | 2007-10-23 | 2009-04-24 | Peugeot Citroen Automobiles Sa | METHOD FOR UREA INJECTION MANAGEMENT IN A SELECTIVE CATALYTIC REDUCTION SYSTEM |
| JP4767296B2 (en) * | 2008-07-31 | 2011-09-07 | 本田技研工業株式会社 | NOx purification catalyst |
| DE102008044708A1 (en) * | 2008-08-28 | 2010-03-04 | Emitec Gesellschaft Für Emissionstechnologie Mbh | SCR system with compensation element |
| US20170082001A1 (en) * | 2015-09-18 | 2017-03-23 | Hyundai Motor Company | Diesel engine exhaust gas treatment system with enhanced nitrogen oxide purification performance |
-
2021
- 2021-01-15 CN CN202110056835.9A patent/CN114762796B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1593752A (en) * | 2004-07-01 | 2005-03-16 | 国电热工研究院 | Catalyst for generating station fume SCR denitration and preparation method thereof |
| CN103263912A (en) * | 2013-05-27 | 2013-08-28 | 四川中自尾气净化有限公司 | Diesel vehicle tail gas purifying catalyst and preparation method thereof |
| CN106975492A (en) * | 2017-04-09 | 2017-07-25 | 复旦大学 | One kind suppresses SO2Denitrating catalyst of oxidation and its preparation method and application |
Non-Patent Citations (2)
| Title |
|---|
| 周大权 等.柴油机国六排放控制技术.《汽车零部件》.2020,(第6期),第106-109页. * |
| 柴油机国六排放控制技术;周大权 等;《汽车零部件》;20200628(第6期);第106-109页 * |
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