Exhaust Gas Catalyst System with Preheating Annular Chamber
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Solution Overview
Problem
Existing exhaust gas catalyst systems for vehicles have limited compactness and inefficiencies in managing gas temperatures, leading to suboptimal pollutant emission reduction and frequent regeneration needs due to clogging issues in particulate filtration systems.
Innovation Solution
The exhaust gas catalyst system features a 'DOC' configuration with a central chamber housing the catalyst substrate, where exhaust gases flow through a preheating annular chamber before passing through the catalyst, optimizing temperature and ensuring high-temperature gases reach the filtration system for efficient regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If exhaust gas catalyst systems use conventional configurations without preheating chambers, then the system structure is simpler, but the exhaust gas temperature is insufficient for efficient filtration and regeneration
Solution Approach 1:
The patent implements a preheating annular chamber nested within the catalyst substrate structure. The preheating chamber is positioned concentrically around the central catalyst substrate, with the catalyst housed in the inner region while the annular region serves as the preheating zone. This nested configuration allows the system to increase exhaust gas temperature through controlled combustion in the annular chamber without significantly increasing overall system volume or structural complexity.
2Productivity
If particulate filtration systems operate without optimized temperature management, then the system operation is simpler, but regeneration frequency increases causing downtime
Solution Approach 1:
The patent implements a preheating annular chamber that prepares the exhaust gas by increasing its temperature before the gas reaches the catalyst substrate and filtration system. This preliminary thermal preparation ensures that the exhaust gas is at the optimal temperature range for efficient catalytic conversion and particulate regeneration, thereby reducing the frequency of regeneration operations and minimizing downtime.
Solution Approach 2:
The patent changes the thermal parameter of the exhaust gas by implementing controlled combustion in the preheating annular chamber. This combustion process raises the exhaust gas temperature to the optimal range for catalytic activity and particulate oxidation, thereby improving regeneration efficiency and reducing the frequency of regeneration operations required.
3Productivity
If the catalyst substrate is positioned without preheating, then the system occupies less space, but the pollutant reduction efficiency is lower
Solution Approach 1:
The patent positions the catalyst substrate in the central region of the exhaust gas catalyst system, with a preheating annular chamber nested around it. This nested arrangement allows the preheating function to be integrated within the existing system footprint rather than adding external components, thereby improving pollutant reduction efficiency through temperature optimization while minimizing increases in system volume.
Solution Approach 2:
The patent utilizes the radial dimension by implementing an annular preheating chamber surrounding the central catalyst substrate. This dimensional arrangement allows the preheating process to occur in the radial space around the catalyst without extending the axial length or increasing the overall system volume significantly, thereby improving efficiency without compromising compactness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves a significant increase in exhaust gas temperature, enhancing the filtration system's efficiency and reducing downtime by ensuring effective regeneration and compact system design.
Implementation Method 1
a catalyst substrate (4) housed in所述第二 chamber (352) wherein, when the exhaust gases pass through the catalyst substrate (4), the catalyst substrate (4) carries out a catalytic action and, in particular, an oxidation action on the particulate
Implementation Method 2
the material trapped in the filtering system, that is the trapped fine dusts, largely consists of carbon particles together with a number of absorbed hydrocarbons. This unwanted material is removable by reacting it with oxygen (O2) or with nitrogen dioxide (NO2)
Implementation Method 3
a small quantity of fuel is injected into the combustion chamber (delayed injection of the main injection system of the engine) such that hydrocarbons are created and burned in the catalyst substrate, causing an increase in the temperature of the exhaust gases that optimizes the operations inside the filtration system
Implementation Method 4
at least one filtration system that is suitable for removing the particles of fine dusts
Data Source
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AI summary
An exhaust gas catalyst system (1) for a vehicle (900) that is suitable for carrying out operations for treating the fine dusts of the exhaust gases produced by the internal combustion engine group (500) of the vehicle (900). The exhaust gas catalyst system (1) comprises an inlet duct (21) and an outlet duct (22) that are connectable to the internal combustion engine group (500) and to the DPF filtration system (600) arranged in the vehicle. The exhaust gas catalyst system (1) comprises a main body (3) that extends along a main axis (X-X) between a head wall (30) comprising at least one inlet opening (301) and at least one outlet opening (302), and a bottom wall (32). Said main body (3) is hollow and defines a first gas treatment chamber (351) in the inside thereof, which is fluidically connected to the inlet opening (301), and a second chamber (352), which is fluidically connected to the outlet opening (302), wherein the first chamber (351) and the second chamber (352) are fluidically connected in a region proximal to the bottom wall (32) such that the exhaust gases flow in the two chambers in opposite directions. The exhaust gas catalyst system (1) comprises a catalyst substrate (4) that is housed in said second chamber (352) and by means of which exothermic filtration and, in particular, oxidation operations are carried out on the fine dust present in the exhaust gases.