Surface Combustion Unit for Rapid Catalyst Activation
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Solution Overview
Problem
Conventional electric heating methods for catalytic converters are inefficient in reducing the activation temperature arrival time of catalysts during engine start, leading to significant discharge of harmful components like CO, HC, and NOx into the atmosphere at the initial engine start stage.
Innovation Solution
A vehicle exhaust gas abatement apparatus featuring a fuel-type surface combustion unit that heats the exhaust gas to activation temperature, coupled with a catalytic converter, allowing direct combustion of harmful components and smoke before they reach the catalytic converter, thereby reducing the activation time of the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If electric heat plates are used to heat catalysts in advance, then catalyst activation is enabled, but heating time cannot be significantly shortened and electric capacity is limited
Solution Approach 1:
The patent replaces the electric heating system with a combustion-based heating system. A combustion chamber burns fuel (such as diesel or gasoline) to generate high-temperature exhaust gas that directly heats the catalyst, substituting electrical energy with chemical energy conversion through combustion.
Solution Approach 2:
The system uses the vehicle's own exhaust gas from the combustion chamber to heat the catalyst, creating a self-service heating mechanism. The exhaust gas from fuel combustion serves dual purposes: driving the exhaust gas recirculation system and providing thermal energy for catalyst activation without external energy input.
2Loss of energy
If catalyst heating is delayed, then electric capacity limitations are avoided, but harmful components are discharged into the atmosphere
Solution Approach 1:
The system performs preliminary heating action through fuel combustion in the combustion chamber before the catalyst needs activation. The combustion process generates hot exhaust gas that pre-heats the catalyst, ensuring it reaches activation temperature quickly and prevents harmful component discharge during cold start conditions.
Solution Approach 2:
The combustion chamber uses controlled oxidation of fuel to generate high-temperature exhaust gas. This accelerated oxidation process produces sufficient thermal energy to rapidly heat the catalyst, overcoming the slow heating limitation of electric systems and enabling quick activation to prevent emissions.
3Ease of manufacture
If a compact structure is implemented, then ease of installation is improved, but space for combustion chamber integration is limited
Solution Approach 1:
The combustion chamber is integrated within or adjacent to the existing exhaust manifold structure, nesting the heating function within the existing exhaust system geometry. This allows the combustion chamber to occupy minimal additional space while still providing sufficient volume for effective fuel combustion and exhaust gas generation.
Solution Approach 2:
The exhaust gas recirculation system serves multiple functions: it recirculates exhaust gas to the combustion chamber for heating, and the same exhaust gas is used to heat the catalyst. This multi-functionality reduces the need for separate dedicated components, enabling compact integration without sacrificing combustion chamber volume.
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
Effectively reduces the activation temperature arrival time of catalysts, preventing the discharge of harmful components into the atmosphere at engine start and improving practical utilization with a compact and efficient structure.
Implementation Method 1
a fuel-type surface combustion unit heating an inner portion of the exhaust gas discharging unit by heat of a flame via a fuel
Implementation Method 2
a catalytic converter connected to a rear end of the exhaust gas discharging unit along a direction in which the exhaust gas is discharged and removing harmful components in the exhaust gas using a catalyst
Data Source
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AI summary
The present invention relates to a vehicle exhaust gas abatement apparatus [u2]. The vehicle exhaust gas abatement apparatus includes: an exhaust gas discharging unit having an exhaust gas discharging pass which is formed on one side thereof and along which an exhaust gas generated from an engine of a vehicle is discharged; a catalytic converter connected to a rear end of the exhaust gas discharging unit along a direction in which the exhaust gas is discharged and removing harmful components in the exhaust gas using a catalyst; and a surface combustion unit coupled to one side of the exhaust gas discharging unit and heating an inner portion of the exhaust gas discharging unit so that the exhaust gas is heated to an activation temperature or higher of the catalyst and then arrives at the catalytic converter.