CN112648045A - Split-surface coating type SDPF system for diesel engine tail gas treatment and preparation method thereof - Google Patents
Split-surface coating type SDPF system for diesel engine tail gas treatment and preparation method thereof Download PDFInfo
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- CN112648045A CN112648045A CN202011390073.8A CN202011390073A CN112648045A CN 112648045 A CN112648045 A CN 112648045A CN 202011390073 A CN202011390073 A CN 202011390073A CN 112648045 A CN112648045 A CN 112648045A
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- coating
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention relates to a split-surface coating type SDPF system for treating tail gas of a diesel engine and a preparation method thereof, wherein the system comprises a particle catcher, at least two air inlets (8) and at least one air outlet (9) which are arranged on the particle catcher, and an inlet surface (4) and an outlet surface (5) which can intercept particles in the tail gas are sequentially arranged between the air inlets (8) and the air outlets (9) along the flow direction of the tail gas; the inlet surface (4) is coated with DPF passive regeneration catalyst; the outlet face (5) is coated with an SCR catalyst. Compared with the prior art, the diesel particulate filter has the advantages of low oil consumption, high stability of the DPF, reduced urea consumption, reduced emission reduction cost and the like.
Description
Technical Field
The invention relates to the field of power machinery and engineering, in particular to a split-surface coating type SDPF system for treating tail gas of a diesel engine and a preparation method thereof.
Background
Diesel engines (diesel engines) are widely used in transportation, agricultural machinery, engineering machinery and the like due to their excellent power performance and economyThe field of the technology. However, diesel engines produce more particulate matter and Nitrogen Oxides (NO)x) The emission causes great pollution to the atmospheric environment and also causes great threat to the health of residents.
A diesel particulate trap (DPF) is capable of trapping particulate matter, preventing the particulate matter from being discharged to the atmosphere. However, the DPF can accumulate particulate matter continuously during use, which raises exhaust back pressure and affects normal operation of the diesel engine. Therefore, the temperature of the particulate matter trapped in the DPF is generally raised by adding a catalyst or raising the temperature by injecting oil, so that combustible substances such as soot and organic matter in the particulate matter are oxidized to form gas, and the gas is discharged to the atmosphere. A Selective Catalytic Reduction (SCR) capable of selectively catalytically reducing NO by a catalyst through ammonia gas decomposed from injected ureaxThereby reducing NOxAnd (5) discharging. Because of the space limitation of the light diesel vehicle, the SDPF-SCR catalyst is coated on the surface of the DPF, so that the space of an after-treatment device is effectively utilized, and the cost is reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the split-surface coating type SDPF system for treating the tail gas of the diesel engine, which has the advantages of low oil consumption, high DPF stability, reduced urea consumption and reduced emission reduction cost, and the preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
the inventors have discovered that NO is present in existing SDPF systems due to SCR catalyst pairing2Resulting in NO that would otherwise be available for DPF regeneration2Is reduced by SCR. Therefore, the temperature of the DPF in passive regeneration is increased, and only active regeneration can be adopted generally, so that the oil consumption is increased and the stability of the DPF is reduced; and consumes more NH3To reduce NO2The urea consumption is increased, the emission reduction cost is increased, and the following specific scheme is adopted for solving the problems:
a split-surface coating type SDPF system for treating tail gas of a diesel engine comprises a particle catcher, at least two gas inlets and at least one gas outlet, wherein the at least two gas inlets and the at least one gas outlet are arranged on the particle catcher;
the inlet surface is coated with DPF passive regeneration catalyst; the outlet face is coated with an SCR catalyst.
Thus, NO in the exhaust gas2Can be utilized with the particulate matters accumulated on the inlet surface firstly, and after the action of promoting the regeneration of the DPF is played under the catalysis of the DPF passive regeneration catalyst, the residual NO in the tail gas2Then NH generated by SCR catalyst in outlet face3For NO2Reduction is carried out to avoid NO2The outlet face to inlet face space in the DPF is also fully utilized to coat more catalyst.
Furthermore, the air inlets are sequentially arrayed on the front side of the particle catcher, and front air plugs are adopted for spacing among the air inlets; the air outlets are sequentially arrayed on the rear side of the particle catcher, and rear air plugs are adopted for spacing among the air outlets.
Further, the number of the air inlets is one more than that of the air outlets.
Further, the front gas plug and the rear gas plug at the end parts are connected by a side gas plug.
Furthermore, adjacent inlet faces are connected by an inner rear gas plug for preventing tail gas leakage, and the inner rear gas plug and the rear gas plug are positioned on the same side.
Furthermore, adjacent outlet faces are connected by an inner front gas plug for preventing tail gas leakage, and the inner front gas plug and the front gas plug are positioned on the same side.
Further, the DPF passive regeneration catalyst comprises a noble metal Pt, and the SCR catalyst comprises a molecular sieve or vanadium-based catalyst.
A method for preparing the above-mentioned split-surface coating type SDPF system for treating the exhaust gas of the diesel engine, comprising the steps of:
(1) preparation of DPF passive regeneration catalyst coating slurry: uniformly stirring the DPF passive regeneration catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-20 mu m, adding deionized water, and uniformly stirring to obtain slurry;
(2) coating DPF passive regeneration catalyst: vertically placing the inlet surface at a coating cavity of a quantitative special coating machine, adding DPF passive regeneration catalyst coating slurry into a slurry disc of the quantitative special coating machine, coating, and drying and roasting to obtain the inlet surface coated with the DPF passive regeneration catalyst;
(3) preparing SCR catalyst coating slurry: uniformly stirring the SCR catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-18 mu m, adding deionized water, and uniformly stirring to obtain slurry;
(4) coating an SCR catalyst: and vertically placing the outlet face at a coating cavity of the special quantitative coating machine, adding the SCR catalyst coating slurry into a slurry tray of the special quantitative coating machine, coating, and drying and roasting to obtain the outlet face coated with the SCR catalyst.
Further, the grinding in the step (1) adopts a planetary ball mill, the rotating speed is 250-; the drying temperature in the step (2) is 100-150 ℃, and the drying time is 3-6 h; the roasting temperature is 450-550 ℃, and the roasting time is 1-2 h.
Further, the grinding in the step (3) adopts a planetary ball mill, the rotating speed is 260-390r/min, and the running time is 4-7 h; the drying temperature in the step (4) is 110-160 ℃, and the drying time is 3-6 h; the roasting temperature is 450-550 ℃, and the roasting time is 1-2 h.
Compared with the prior art, the invention has the following advantages:
(1) the coatable area of the catalyst is increased, and because the split-surface coating is adopted, the coatable area is twice that of the traditional SDPF, so that the probability of catalyst aggregation is reduced and the durability of the SDPF is improved under the same catalyst loading rate;
(2) due to elimination of SCR catalyst to NO2The SDPF particulate matter light-off temperature is low.
Drawings
FIG. 1 is a schematic diagram of the SDPF system in an embodiment;
the reference numbers in the figures indicate: the gas plug comprises a front gas plug 1, a side gas plug 2, a rear gas plug 3, an inlet face 4, an outlet face 5, an inner front gas plug 6, an inner rear gas plug 7, a gas inlet 8 and a gas outlet 9.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
A kind of diesel engine exhaust gas treatment uses the coated SDPF system of the facet, as shown in figure 1, the system includes the particle trap and sets up 5 air inlets 8 and 4 air outlets 9 on the particle trap, there are inlet faces 4 and outlet faces 5 that can intercept the particle in the exhaust gas between air inlet 8 and air outlet 9 sequentially along the exhaust flow direction; the inlet face 4 is coated with DPF passive regeneration catalyst; the outlet face 5 is coated with an SCR catalyst.
Thus, NO in the exhaust gas2Can be utilized with the particulate matters accumulated on the inlet surface 4 firstly, and after the action of promoting the regeneration of the DPF is played under the catalysis of the DPF passive regeneration catalyst, the residual NO in the tail gas2And then NH generated by the SCR catalyst in the outlet face 53For NO2Reduction is carried out to avoid NO2The space between the outlet face 5 and the inlet face 4 of the DPF is also fully utilized to coat more catalyst.
The air inlets 8 are sequentially arrayed on the front side of the particle catcher, and the air inlets 8 are spaced by adopting a front air plug 1; the air outlets 9 are sequentially arrayed at the rear side of the particle catcher, and the air outlets 9 are spaced by adopting rear air plugs 3. The front gas plug 1 and the rear gas plug 3 at the end parts are connected by a side gas plug 2. The adjacent inlet surfaces 4 are connected by an inner rear gas plug 7 for preventing tail gas leakage, and the inner rear gas plug 7 and the rear gas plug 3 are positioned on the same side. The adjacent outlet faces 5 are connected by an inner front gas plug 6 for preventing tail gas from leaking, and the inner front gas plug 6 and the front gas plug 1 are positioned on the same side. The front gas plug 1, the inner front gas plug 6 and the gas outlet 9 are correspondingly arranged in the horizontal direction, and the gas inlet 8, the inner rear gas plug 7 and the rear gas plug 3 are correspondingly arranged in the horizontal direction.
The preparation method of the split-surface coating type SDPF system for treating the tail gas of the diesel engine comprises the following steps of:
(1) preparation of DPF passive regeneration catalyst coating slurry: uniformly stirring the DPF passive regeneration catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-20 mu m, adding deionized water, and uniformly stirring to obtain slurry; wherein, the grinding adopts a planetary ball mill, the rotating speed is 250-380r/min, and the running time is 3-6 h;
(2) coating DPF passive regeneration catalyst: vertically placing the inlet surface 4 at a coating cavity of a special quantitative coating machine, adding DPF passive regeneration catalyst coating slurry into a slurry tray of the special quantitative coating machine, coating, and drying and roasting to obtain the inlet surface 4 coated with the DPF passive regeneration catalyst; wherein the drying temperature is 100-150 ℃, and the drying time is 3-6 h; the roasting temperature is 450-550 ℃, and the roasting time is 1-2h
(3) Preparing SCR catalyst coating slurry: uniformly stirring the SCR catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-18 mu m, adding deionized water, and uniformly stirring to obtain slurry; wherein, the grinding adopts a planetary ball mill, the rotating speed is 260-390r/min, and the running time is 4-7 h;
(4) coating an SCR catalyst: vertically placing the outlet face 5 at a coating cavity of a special quantitative coating machine, adding the SCR catalyst coating slurry into a slurry tray of the special quantitative coating machine, coating, and then drying and roasting to obtain the outlet face 5 coated with the SCR catalyst, wherein the drying temperature is 110-160 ℃, and the drying time is 3-6 hours; the roasting temperature is 450-550 ℃, and the roasting time is 1-2 h.
In the embodiment, by taking the coating amount of the precious metal catalyst of 7g/L and the SCR catalyst of 60g/L as an example, wherein the DPF passive regeneration catalyst is precious metal Pt, the SCR catalyst is a molecular sieve or vanadium-based catalyst, the DPF balance temperature (namely the temperature at which the trapping rate and the regeneration rate of the DPF soot particles are balanced) of the traditional SDPF is 300 ℃, and the balance point temperature adopting the method is 275 ℃, the DPF active regeneration efficiency can be improved from 72% to 80%.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.
Claims (10)
1. The split-surface coating type SDPF system for treating the tail gas of the diesel engine is characterized by comprising a particle catcher, at least two gas inlets (8) and at least one gas outlet (9) which are arranged on the particle catcher, wherein an inlet surface (4) and an outlet surface (5) which can intercept particles in the tail gas are sequentially arranged between the gas inlets (8) and the gas outlets (9) along the flow direction of the tail gas;
the inlet surface (4) is coated with DPF passive regeneration catalyst; the outlet face (5) is coated with an SCR catalyst.
2. The split-surface coating type SDPF system for treating the tail gas of the diesel engine according to claim 1, wherein the air inlets (8) are sequentially arrayed on the front side of the particle catcher, and the air inlets (8) are spaced by a front air plug (1); the air outlets (9) are sequentially arrayed at the rear side of the particle catcher, and the air outlets (9) are separated by a rear gas plug (3).
3. The split-surface coating SDPF system for treating exhaust gas of diesel engine as claimed in claim 1, wherein the number of the air inlets (8) is one more than that of the air outlets (9).
4. The split-surface coating type SDPF system for treating diesel engine exhaust according to claim 2 or 3, wherein the front gas plug (1) and the rear gas plug (3) at the end parts are connected by a side gas plug (2).
5. A split-surface coated SDPF system for the treatment of diesel exhaust gases according to claim 2 or 3, characterized in that adjacent inlet surfaces (4) are connected by means of an internal rear gas plug (7) preventing exhaust gas leakage, the internal rear gas plug (7) being located on the same side as the rear gas plug (3).
6. The split-surface coating SDPF system for treating exhaust gas of diesel engines according to claim 2 or 3, wherein adjacent outlet surfaces (5) are connected by an internal front gas plug (6) for preventing exhaust gas from leaking, and the internal front gas plug (6) is located at the same side as the front gas plug (1).
7. The split-surface coated SDPF system for treating diesel exhaust according to claim 1, wherein the DPF passive regeneration catalyst comprises a noble metal Pt and the SCR catalyst comprises a molecular sieve or a vanadium-based catalyst.
8. A method of making a split-surface coated SDPF system for treating diesel exhaust according to claim 1, comprising the steps of:
(1) preparation of DPF passive regeneration catalyst coating slurry: uniformly stirring the DPF passive regeneration catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-20 mu m, adding deionized water, and uniformly stirring to obtain slurry;
(2) coating DPF passive regeneration catalyst: vertically placing the inlet surface (4) at a coating cavity of a quantitative special coating machine, adding DPF passive regeneration catalyst coating slurry into a slurry disc of the quantitative special coating machine, coating, and drying and roasting to obtain the inlet surface (4) coated with the DPF passive regeneration catalyst;
(3) preparing SCR catalyst coating slurry: uniformly stirring the SCR catalyst and deionized water, grinding until the granularity D90 of the slurry is 2-18 mu m, adding deionized water, and uniformly stirring to obtain slurry;
(4) coating an SCR catalyst: and vertically placing the outlet face (5) at a coating cavity of the special quantitative coating machine, adding the SCR catalyst coating slurry into a slurry tray of the special quantitative coating machine, coating, and drying and roasting to obtain the outlet face (5) coated with the SCR catalyst.
9. The method as claimed in claim 8, wherein the step (1) of grinding is performed by a planetary ball mill at a rotation speed of 250-380r/min for a running time of 3-6 h; the drying temperature in the step (2) is 100-150 ℃, and the drying time is 3-6 h; the roasting temperature is 450-550 ℃, and the roasting time is 1-2 h.
10. The method as claimed in claim 8, wherein the step (3) of grinding is performed by using a planetary ball mill with a rotation speed of 260-390r/min and a running time of 4-7 h; the drying temperature in the step (4) is 110-160 ℃, and the drying time is 3-6 h; the roasting temperature is 450-550 ℃, and the roasting time is 1-2 h.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011390073.8A CN112648045A (en) | 2020-12-02 | 2020-12-02 | Split-surface coating type SDPF system for diesel engine tail gas treatment and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011390073.8A CN112648045A (en) | 2020-12-02 | 2020-12-02 | Split-surface coating type SDPF system for diesel engine tail gas treatment and preparation method thereof |
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| CN112648045A true CN112648045A (en) | 2021-04-13 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702745A (en) * | 2011-05-31 | 2014-04-02 | 庄信万丰股份有限公司 | Dual function catalytic filter |
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- 2020-12-02 CN CN202011390073.8A patent/CN112648045A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702745A (en) * | 2011-05-31 | 2014-04-02 | 庄信万丰股份有限公司 | Dual function catalytic filter |
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Application publication date: 20210413 |