Catalytic Evaporator Pulsed Fuel Oxidant Feed
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Solution Overview
Problem
Existing catalytic evaporator methods for adjusting fuel properties in internal combustion engines are limited in increasing air ratio without exceeding catalyst temperature, which restricts the shift in fuel properties, particularly reducing NOx and soot emissions.
Innovation Solution
A method involving pulsating additions of fuel and/or oxidant to the catalytic evaporator, allowing for increased air ratio without overheating the catalyst, thereby enhancing the production of hydrogen and carbon monoxide reaction products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the air ratio is increased to shift fuel properties, then NOx and soot emissions are reduced, but the catalyst temperature exceeds maximum operating limits
Solution Approach 1:
The patent applies periodic pulsating supply of fuel and/or oxidant instead of continuous supply. This creates alternating phases of high air ratio (producing reforming reactions and reducing emissions) and lower air ratio (allowing catalyst temperature to recover), thereby achieving emission reduction without sustained overheating of the catalyst
Solution Approach 2:
The patent dynamically adjusts the air ratio by pulsating the supply of fuel and/or oxidant, allowing the system to operate at high air ratios during pulsation phases for emission reduction, then recover during non-pulsation phases, maintaining catalyst temperature within acceptable limits through dynamic operation rather than static high air ratio
2Object-generated harmful factors
If the operating pressure is increased to shift fuel properties, then the effectiveness of hydrogen and carbon monoxide production increases, but the supercharging capacity of the internal combustion engine is exceeded
Solution Approach 1:
The patent uses periodic pulsating supply to achieve high air ratio conditions that promote reforming reactions producing hydrogen and carbon monoxide, effectively shifting fuel properties without requiring sustained high operating pressure that would exceed engine supercharging capacity
Solution Approach 2:
The patent changes the operational parameters by implementing pulsating supply patterns rather than steady-state operation, allowing the system to achieve effective fuel property shifts through temporal variation in air ratio and residence time rather than through high pressure alone
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 method effectively shifts fuel properties to reduce NOx and soot emissions, lowers light-off temperatures, and provides cost and power advantages for internal combustion engines and exhaust gas after-treatment systems.
Implementation Method 1
in a first reaction chamber the fuel is evaporated and strongly sub-stoichiometrically oxidized with the supply of air by means of a first catalyst
Implementation Method 2
the fuel is evaporated and strongly sub-stoichiometrically oxidized with the supply of air
Implementation Method 3
the fuel is evaporated and strongly sub-stoichiometrically oxidized
Data Source
AI summary
A method is described for operating a catalytic evaporator (1), with the step: feeding fuel and an oxidant to the catalytic evaporator, which method is distinguished by the fact that (a) the feed of the fuel is performed as a pulsed feed, and/or (b) the feed of the oxidant is performed as a pulsed feed.