CN108590825B - Engine catalytic converter with novel expansion pipe guiding device and sepiolite carrier - Google Patents
Engine catalytic converter with novel expansion pipe guiding device and sepiolite carrier Download PDFInfo
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- CN108590825B CN108590825B CN201810390921.1A CN201810390921A CN108590825B CN 108590825 B CN108590825 B CN 108590825B CN 201810390921 A CN201810390921 A CN 201810390921A CN 108590825 B CN108590825 B CN 108590825B
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- 239000004113 Sepiolite Substances 0.000 title claims abstract description 78
- 229910052624 sepiolite Inorganic materials 0.000 title claims abstract description 78
- 235000019355 sepiolite Nutrition 0.000 title claims abstract description 78
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 48
- 230000008602 contraction Effects 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000969 carrier Substances 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 10
- 239000003054 catalyst Substances 0.000 claims abstract description 9
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims abstract description 4
- 238000013016 damping Methods 0.000 claims abstract description 4
- 239000012530 fluid Substances 0.000 claims description 12
- 230000002378 acidificating effect Effects 0.000 claims description 9
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 239000000243 solution Substances 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000004381 surface treatment Methods 0.000 claims description 3
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000000746 purification Methods 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract 1
- 238000004088 simulation Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 5
- 238000006555 catalytic reaction Methods 0.000 description 4
- 238000007598 dipping method Methods 0.000 description 4
- 238000011068 loading method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910000510 noble metal Inorganic materials 0.000 description 4
- 238000005457 optimization Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 239000002131 composite material Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 231100000956 nontoxicity Toxicity 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000010425 asbestos Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- DKAGJZJALZXOOV-UHFFFAOYSA-N hydrate;hydrochloride Chemical compound O.Cl DKAGJZJALZXOOV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
-
- 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
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
The invention relates to an engine catalytic converter with a novel expansion pipe flow guide device and a sepiolite carrier, which consists of a flange, an expansion pipe, a flow guide device, a fixed rib plate, a shell, a damping layer, a sepiolite carrier and a contraction pipe; the expansion pipe is of a smooth streamline curved surface structure, so that local flow loss in the expansion pipe is eliminated, and the tail curved surface bending section is used for changing the flow direction of tail gas; the tail gas is guided by the cooperation of the inner wall of the expansion pipe and the outer wall of the guide device, so that the flow distribution of the gas flow is more uniform when the gas flow passes through the sepiolite carrier; a fixing rib plate is added to fix the flow guide device on the inner wall of the expansion pipe; the invention is suitable for tail gas purification of gasoline engines or diesel engines under different working conditions, and is also suitable for ceramic honeycomb carriers and metal carriers with different pore densities and pore shapes; sepiolite is added in the coating material of the carrier catalyst, so that the compound conversion efficiency of tail gas is increased; the contraction pipe also adopts a streamline curved surface, so that the flow resistance in the contraction pipe is reduced, and the device has a simple structure.
Description
Technical Field
The invention relates to an engine catalytic converter, in particular to an engine catalytic converter with a novel expansion pipe flow guide device and a sepiolite carrier.
Background
Traditional engine catalytic converter, its expansion pipe design become the wall for the straight edge shape curved surface, the gradually crescent round platform structure of cross-section, and its shortcoming is that automobile exhaust gets into the expansion pipe, easily forms phenomena such as vortex, gas wall separation at the nearly wall of expansion pipe for the inside great local flow loss that forms of expansion pipe, the automobile exhaust who makes the carrier front end simultaneously radially distributes unevenly. The carrier central area of the traditional catalytic converter is easy to age quickly due to large thermal stress generated due to large flow and high temperature, and the carrier edge area has small flow and low carrier utilization rate, so that the conversion efficiency and the utilization rate of the carrier are low on the whole. In addition, the improved structure of the existing catalytic converter is mainly characterized in that a plurality of layers of horn-shaped guide plates or spiral blade type guide devices are additionally arranged in the expansion pipe, and although the local flow loss in the expansion pipe can be effectively eliminated, the guide devices only force airflow to change the flow direction, so that the airflow flows to the middle of the plurality of layers of horn-shaped guide plates and flows along the guide plates, the flow resistance is increased, and the flow uniformity of automobile exhaust gas passing through a carrier is not ideal enough. The invention designs the expansion pipe into a smooth streamline curved surface structure, designs the flow guide device into a hollow and closed structure with a streamline curved surface on the wall surface, the front wall surface is a herringbone curved surface, and the back wall surface is a rotary curved shell structure with an omega-shaped curved surface, so that the flow guide device and the expansion pipe play a role in guiding together, automobile exhaust firstly flows to two ends of the flow guide device, then flows into the tail part of the flow guide device along the radial direction of the catalytic converter, and finally flows into the sepiolite carrier. More importantly, the catalyst coating of the traditional catalytic converter carrier is made of precious metal materials, has only a single catalytic reaction effect and small specific surface area, so that a large amount of precious metals are required to be loaded to meet higher emission standards, and the production cost of the catalytic converter is higher. The sepiolite crystal is of a layer chain structure, the specific structure of the sepiolite crystal determines that the sepiolite crystal has good adsorption performance, rheological performance and catalytic performance, Hunan Tan is called as ' all ' of Chinese sepiolite ', the sepiolite in Hunan Tan area does not contain asbestos, is nontoxic and radioactive, has the characteristics of high thermal stability, high adsorbability and large specific surface area, and the sepiolite is used in a carrier catalyst coating material of an engine catalytic converter, so that the sepiolite can realize higher chemical catalytic reaction and physical adsorption purification composite conversion efficiency on engine tail gas under the condition of smaller noble metal loading capacity, and the production cost is saved.
Disclosure of Invention
The invention aims to provide an engine catalytic converter structure with a novel expansion pipe flow guide device and a sepiolite carrier aiming at the defects in the existing catalytic converter structure, so that the internal pressure loss of the catalytic converter is smaller, and the automobile exhaust in the carrier is more uniformly distributed, so that the carrier utilization rate is improved, the service life is prolonged, the sepiolite is used in a carrier catalyst coating material, the higher catalytic efficiency can be achieved under the condition of smaller noble metal loading capacity, and the production cost is saved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an engine catalytic converter with a novel expansion pipe flow guide device and a sepiolite carrier is characterized by consisting of a flange, an expansion pipe, a flow guide device, a fixed rib plate, a shell, a damping layer, a sepiolite carrier and a contraction pipe; the expansion pipe is internally provided with a flow guide device, the inlet end of the expansion pipe is connected with the outlet end of the exhaust pipe through a flange, the flow guide device is positioned in the expansion pipe and fixed on the inner wall of the expansion pipe through fixing rib plates, the number of the fixing rib plates is three, the upper long edge of the fixing rib plate is welded on the inner wall of the expansion pipe, the lower long edge of the fixing rib plate is welded on the front wall surface of the flow guide device, the outlet end of the expansion pipe is connected with. A shock absorption layer is arranged between the sepiolite carrier and the shell. The expansion pipe is designed into a smooth streamline curved surface structure, the flow guide device is additionally arranged in the expansion pipe, under the common guide effect of the flow guide device and the expansion pipe, automobile exhaust firstly flows to the peripheral area at the maximum diameter position of the flow guide device, and then flows into the back area of the flow guide device along the radial direction of the catalytic converter, and then enters the sepiolite carrier. The CFD software Fluent is used for carrying out numerical simulation on the automobile engine catalytic converter model with the novel expansion pipe flow guiding structure, and guidance can be provided for optimization design. The simulation result shows that compared with the traditional catalytic converter of the engine and the catalytic converter with a plurality of layers of trumpet-shaped guide plates or spiral blade type guide devices, the improved structure of the invention can greatly improve the distribution uniformity of the internal flow field of the sepiolite carrier, simultaneously eliminate the local flow loss in the expansion pipe, improve the utilization rate of the sepiolite carrier and prolong the service life of the sepiolite carrier.
Furthermore, the expansion pipe is of a smooth streamline curved surface structure, the flow direction of the fluid can be changed by the bent section of the curved surface at the tail part, the fluid at the front end of the expansion pipe is changed from axial flow to radial flow, and tail gas is converged into the tail part of the flow guide device from the radial direction and then enters the sepiolite carrier.
Furthermore, the flow guide device is hollow and closed, the wall surface of the flow guide device is a streamline curved surface, the front wall surface of the flow guide device is a herringbone curved surface, the back wall surface of the flow guide device is a rotary curved shell structure with an omega-shaped curved surface, the front wall surface of the flow guide device is connected with the expansion pipe through three fixing rib plates and is used for guiding tail gas in a coordinated mode, and the omega-shaped curved surface of the back wall surface can reduce flow resistance, so that the tail gas is uniformly mixed at the front end of the sepiolite carrier, more importantly, the radial tail gas distribution can be improved, and the flow uniformity of the engine tail gas passing through the.
Furthermore, the contraction pipe is of a smooth streamline curved surface structure and is used for reducing flow resistance in the contraction pipe, and the shape and the size of the section of the outlet end of the contraction pipe are consistent with those of the inlet end of the expansion pipe.
Furthermore, the thickness of the fixed rib plate is 1.5mm, the upper long edge of the fixed rib plate is fixed on the inner wall of the expansion pipe, the lower long edge of the fixed rib plate is fixed on the front wall surface of the flow guide device, the two long edges of the fixed rib plate are spline curves, the height of the fixed rib plate is gradually reduced along the flow direction of the tail gas, and the minimum height of the fixed rib plate is 21% of the diameter of the inlet of the.
Furthermore, the sepiolite carrier is suitable for ceramic honeycomb carriers and metal carriers with different pore densities and pore shapes, and the surface coating material is prepared from natural sepiolite in the Hunan pond area and is prepared into a carrier coating material after acidic surface treatment.
Further, the preparation method of the sepiolite carrier coating material comprises the steps of dipping natural sepiolite in the Hunan pool area into 1.7mol/L hydrochloric acid water solution for surface acidity treatment, drying and roasting to obtain the acidic sepiolite, dipping the acidic sepiolite into 4% cerium nitrate solution for 30 hours, and finally roasting at the constant temperature of 450 ℃ for 3 hours to obtain the Cu/Sep catalyst of the sepiolite carrier.
The invention has the positive effects that: the curved surface bending section at the tail part of the expansion pipe wall can change the flow direction of fluid, so that the fluid in the expansion pipe changes from axial flow to radial flow, and the local flow loss in the expansion pipe is eliminated; the flow guide device is fixed in the expansion pipe, the wall surface of the expansion pipe and the wall surface of the flow guide device are both designed to be smooth streamline curved surfaces, and the tail gas is guided in a synergistic manner, so that the flow resistance in the expansion pipe is reduced, and meanwhile, the flow field is uniformly distributed when the airflow passes through the front end of the sepiolite carrier, so that the utilization rate of the sepiolite carrier is improved, and the service life of the sepiolite carrier is prolonged; the invention is suitable for purifying the tail gas of the gasoline engine or the diesel engine under different working conditions, and is also suitable for ceramic honeycomb carriers and metal carriers with different pore densities and pore shapes; the sepiolite with high thermal stability, high adsorbability, large specific surface area, no toxicity and no radioactivity is added in the coating material of the carrier catalyst, so that the chemical catalytic reaction and physical adsorption purification composite conversion efficiency of the engine tail gas is increased simultaneously on the premise of smaller noble metal loading, and the production cost is saved; the contraction pipe also adopts a streamline curved surface, so that the flow resistance in the contraction pipe is reduced, and the device has a simple structure.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and examples.
FIG. 1 is a schematic view of the overall structure of a catalytic converter
FIG. 2 is a schematic sectional view of a catalytic converter
FIG. 3 is a schematic structural view of the fixing rib plate and the flow guiding device
FIG. 4 is a schematic view of a half-section structure of a flow guide device
FIG. 5 is a cloud diagram of two-dimensional CFD simulated velocity field distribution of the novel catalytic converter
FIG. 6 is a two-dimensional CFD simulated pressure field distribution cloud diagram of the novel catalytic converter
In the figures 1-4, 1 is an expansion pipe, 2 is a shock absorption layer, 3 is a shell, 4 is a contraction pipe, 5 is a flange, 6 is a sepiolite carrier, 7 is a fixing rib plate, and 8 is a flow guide device.
Detailed Description
As shown in fig. 1-4, the catalytic converter for the engine with the novel expansion pipe flow guiding device and the sepiolite carrier comprises a flange 5, an expansion pipe 1, a flow guiding device 8, a fixed rib plate 7, a shell 3, a damping layer 2, a sepiolite carrier 6 and a contraction pipe 4; the inlet end of an expansion pipe 1 is connected with a flange 5, the inlet end of the expansion pipe 1 is connected with the outlet end of an exhaust pipe through a flange, a flow guide device 8 is arranged in the expansion pipe 1, the flow guide device 8 is positioned in the expansion pipe 1 and fixed on the inner wall of the expansion pipe 1 through a fixing rib plate 7, the fixing rib plates 7 are three in number, the upper long edge of the fixing rib plate is welded on the inner wall of the expansion pipe 1, the lower long edge of the fixing rib plate is welded on the front wall surface of the flow guide device 8, the outlet end of the expansion pipe 1 is connected with one end of a shell 3, the inlet end of a contraction pipe 4 is connected with the other end of the shell 3.
The expansion pipe 1 is of a smooth streamline curved surface structure, the flow direction of fluid can be changed by the bent section of the tail curved surface, so that the fluid at the front end of the expansion pipe 1 changes from axial flow to radial flow, and tail gas radially flows into the back area of the flow guide device 8 and then enters the sepiolite carrier 6.
The flow guide device 8 is hollow and closed, the wall surface is a streamline curved surface, the front wall surface is a herringbone curved surface, the back wall surface is a rotary curved shell structure with an omega-shaped curved surface, the front wall surface is connected with the expansion pipe through three fixing rib plates and guides the tail gas in a coordinated mode, the omega-shaped curved surface of the back wall surface can reduce flow resistance, the tail gas is uniformly mixed at the front end of the sepiolite carrier 6, more importantly, the radial tail gas distribution can be improved, and the flow uniformity of the engine tail gas passing through the sepiolite carrier 6 is greatly improved.
The contraction pipe 4 is of a smooth streamline curved surface structure and is used for reducing flow resistance in the contraction pipe 4, and the shape and the size of the section of the outlet end of the contraction pipe 4 are consistent with those of the inlet end of the expansion pipe 1.
The thickness of the fixed rib plate 7 is 1.5mm, the upper long edge of the fixed rib plate is fixed on the inner wall of the expansion pipe 1, the lower long edge of the fixed rib plate is fixed on the front wall surface of the flow guide device 8, the two long edges of the fixed rib plate are spline curves, the height of the fixed rib plate is gradually reduced along the flow direction of tail gas, and the minimum height of the fixed rib plate is 21% of the diameter of the inlet of the.
The sepiolite carrier 6 is suitable for ceramic honeycomb carriers and metal carriers with different pore densities and pore shapes, and the surface coating material is prepared from natural sepiolite in the plunge pool area and is prepared into a carrier coating material after acidic surface treatment.
The preparation method of the sepiolite carrier 6 coating material comprises the steps of dipping natural sepiolite in the Hunan pool area into 1.7mol/L hydrochloric acid aqueous solution for surface acidity treatment, drying and roasting to obtain the acidic sepiolite, dipping the acidic sepiolite into 4% cerium nitrate solution for 30 hours, and finally roasting at the constant temperature of 450 ℃ for 3 hours to obtain the Cu/Sep catalyst of the sepiolite carrier 6.
Automobile exhaust from 1 entry end of expansion pipe entering device, under the combined action of 1 inner wall of expansion pipe and 8 outer walls of guiding device, tail gas flows to 8 both ends of guiding device respectively, and the section of bending of 1 afterbody curved surface of expansion pipe can change the fluid flow direction for the fluid of 1 front end of expansion pipe is become radial flow by axial flow, and tail gas is regional from radially converging into guiding device back, then gets into inside sepiolite carrier 6. Compared with the traditional catalytic converter of an engine and the catalytic converter with a plurality of layers of horn-shaped guide plates or spiral blade type guide devices, the improved structure can greatly improve the distribution uniformity of the internal flow field of the sepiolite carrier 6, further improve the utilization rate and the service life of the sepiolite carrier 6, and exhaust enters the sepiolite carrier 6 to be purified and then is discharged out of the device through the contraction pipe 4.
Numerical simulation is carried out on the automobile engine catalytic converter model with the novel expansion pipe flow guide structure by using Fluent software, and guidance can be provided for structural optimization design. Simulation results show that the speed uniformity index of the front end of the sepiolite carrier 6 of the catalytic converter model used by the invention reaches more than 0.94, which is greatly higher than the improved structure of the catalytic converter of the traditional engine catalytic converter and the catalytic converter additionally provided with a multi-layer trumpet-shaped guide plate or spiral blade type guide device. Fig. 5 is a cloud chart of two-dimensional CFD simulation velocity field distribution of the novel catalytic converter, which can be seen that, inside the sepiolite carrier 6 of the novel catalytic converter, the flow velocity is layered less, most of the fluid passes through the whole sepiolite carrier 6 at a higher flow velocity, the low-velocity zone inside the sepiolite carrier 6 only exists in a very narrow region close to the inner wall of the housing 3, and the whole sepiolite carrier 6 is negligible relatively, which shows that the novel catalytic converter can reduce the range of the low-velocity zone inside the sepiolite carrier 6, so that the fluid flow inside the sepiolite carrier 6 is wholly uniform, and the simulation achieves the expected optimization effect.
Fig. 6 is a cloud diagram of two-dimensional CFD simulation pressure field distribution of the novel catalytic converter, and the result shows that, inside the sepiolite carrier 6 of the catalytic converter, the pressure distribution is relatively uniform, and no local concentrated pressure is generated, the highest pressure of the model only appears in a relatively small area on the wall surface of the flow guide device 8, the influence on the whole catalytic converter is relatively small, the simulation result can reflect the main characteristics of the novel catalytic converter, and the theoretical basis can be provided for the structural optimization of the catalytic converter.
After the sepiolite with high thermal stability, high adsorbability, large specific surface area and non-toxicity and non-radioactivity is added in the carrier catalyst coating material of the novel catalytic converter, the bench experiment comparison test of the engine finds that the chemical catalytic reaction and physical adsorption purification composite conversion efficiency of the tail gas of the engine is effectively improved on the premise of smaller noble metal loading amount, and the emission of harmful pollutants of the engine is reduced.
The above description is only about the embodiment of the present invention with respect to a catalytic converter of an engine having a novel diverging pipe guiding device and a sepiolite carrier, but the present invention is not limited to the disclosure of the embodiment and the accompanying drawings, and equivalents or modifications made without departing from the spirit of the disclosure of the present invention fall within the protection scope of the present invention.
Claims (4)
1. An engine catalytic converter with a novel expansion pipe flow guide device and a sepiolite carrier is characterized by consisting of a flange, an expansion pipe, a flow guide device, a fixed rib plate, a shell, a damping layer, a sepiolite carrier and a contraction pipe; the inlet end of the expansion pipe is connected with a flange, the inlet end of the expansion pipe is connected with the outlet end of the exhaust pipe through the flange, a flow guide device is arranged in the expansion pipe and is fixed on the inner wall of the expansion pipe through fixing rib plates, the number of the fixing rib plates is three, the upper long edge of the fixing rib plate is welded on the inner wall of the expansion pipe, the lower long edge of the fixing rib plate is welded on the front wall surface of the flow guide device, the outlet end of the expansion pipe is connected with one end of a shell, the other end of the shell is connected with the inlet end; the expansion pipe is of a smooth streamline curved surface structure, the flow direction of fluid can be changed by the curved surface bending section at the tail part, so that the fluid at the front end of the expansion pipe changes from axial flow to radial flow, and engine tail gas flows into the back area of the flow guide device from the radial direction and then enters the sepiolite carrier; the flow guide device is hollow and closed, the wall surface is a streamline curved surface, the front wall surface is a herringbone curved surface, the back wall surface is a rotary curved shell structure with an omega-shaped curved surface, the front wall surface of the flow guide device is connected with the expansion pipe through three fixing rib plates and is used for guiding tail gas in a cooperative manner, the flow resistance can be reduced by the omega-shaped curved surface of the back wall surface, and the flow uniformity of the engine tail gas is improved when the engine tail gas passes through the sepiolite carrier; the sepiolite carrier is suitable for ceramic honeycomb carriers and metal carriers with different pore densities and pore shapes, and the surface coating material is prepared from natural sepiolite in the Hunan pond area and is prepared into a carrier coating material after acidic surface treatment.
2. The catalytic converter of the engine with the novel expansion pipe flow guiding device and the sepiolite carrier according to claim 1, wherein the thickness of the fixing rib plate is 1.5mm, the two long edges of the fixing rib plate are spline curves, the height of the fixing rib plate is gradually reduced along the flow direction of the exhaust, and the minimum height is 21% of the diameter of the inlet of the expansion pipe.
3. The engine catalytic converter with the novel expansion pipe flow guide device and the sepiolite carrier according to claim 1, wherein the sepiolite carrier coating material is prepared by immersing natural sepiolite in the Hunan pool area in 1.7mol/L hydrochloric acid aqueous solution for surface acidity treatment, drying and roasting to obtain acidic sepiolite, immersing the acidic sepiolite in 4% cerium nitrate solution for 30 hours, and finally roasting at the constant temperature of 450 ℃ for 3 hours to obtain the Cu/Sep catalyst of the sepiolite carrier.
4. The catalytic converter of engine with the new type of the diverging pipe diversion device and the sepiolite carrier as claimed in claim 1, wherein the contracting pipe is a smooth streamline curved structure, and the cross section shape and size of the outlet end of the contracting pipe are the same as the inlet end of the diverging pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810390921.1A CN108590825B (en) | 2018-04-27 | 2018-04-27 | Engine catalytic converter with novel expansion pipe guiding device and sepiolite carrier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810390921.1A CN108590825B (en) | 2018-04-27 | 2018-04-27 | Engine catalytic converter with novel expansion pipe guiding device and sepiolite carrier |
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| Publication Number | Publication Date |
|---|---|
| CN108590825A CN108590825A (en) | 2018-09-28 |
| CN108590825B true CN108590825B (en) | 2020-04-17 |
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| CN201810390921.1A Expired - Fee Related CN108590825B (en) | 2018-04-27 | 2018-04-27 | Engine catalytic converter with novel expansion pipe guiding device and sepiolite carrier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110821610B (en) * | 2019-12-11 | 2021-11-12 | 湘潭大学 | Gasoline car sleeve type molecular sieve hydrocarbon adsorption type catalytic converter |
| CN111102037B (en) * | 2019-12-18 | 2021-11-12 | 湘潭大学 | Engine catalysis type particulate trap with amortization guiding device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3803917C2 (en) * | 1988-02-09 | 1999-02-25 | Siemens Ag | Arrangement of a honeycomb body in a housing |
| DE10021166A1 (en) * | 2000-04-29 | 2001-11-08 | Univ Stuttgart | Catalyst matrix used for purifying IC engine exhaust gases has a longitudinal axis running in the main flow direction of the exhaust gases, a bent inlet surface, and an outlet surface |
| FR2924466A3 (en) * | 2007-11-29 | 2009-06-05 | Renault Sas | Catalyst for exhaust line of motor vehicle, has inlet cone with projection element dividing inlet exhaust gas flow into two internal exhaust gas flows for permitting internal flows to cross element on width direction |
| CN101333956A (en) * | 2008-07-24 | 2008-12-31 | 无锡红湖消声器有限公司 | Coupling type catalyst |
| FR2945576A1 (en) * | 2009-05-14 | 2010-11-19 | Peugeot Citroen Automobiles Sa | Mixer for mixing fuel e.g. diesel, injected into exhaust line with exhaust gas produced by internal combustion of car, has deflector whose length along path is greater or equal to half of large transverse dimension of inner periphery |
| CN106121789A (en) * | 2016-08-22 | 2016-11-16 | 成都众易通科技有限公司 | A kind of vehicle catalytic converter structure |
-
2018
- 2018-04-27 CN CN201810390921.1A patent/CN108590825B/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN108590825A (en) | 2018-09-28 |
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