Alcohol Reforming Catalyst for Engine Cold Start
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Solution Overview
Problem
Current technologies face challenges in efficiently utilizing alcohol fuels in internal combustion engines due to low heating values, cold start issues, and high emissions, particularly with ethanol, which requires blending with gasoline and results in inefficient combustion and emissions problems.
Innovation Solution
A process involving a reforming catalyst with a copper-coated metal sponge structure that efficiently reforms alcohol fuels at low temperatures to produce hydrogen-containing gas mixtures, allowing for improved combustion efficiency and reduced emissions by using waste heat from the engine exhaust to maintain the reformer temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If alcohol fuel is used directly in internal combustion engines, then renewable fuel utilization is achieved, but combustion efficiency is low due to lower heating values
Solution Approach 1:
The patent transforms alcohol fuel from liquid phase to gaseous phase through reforming process, changing its physical and chemical parameters. This conversion produces a gas mixture with higher effective heating value and improved combustion characteristics, resolving the low combustion efficiency issue while reducing the volume of fuel needed
Solution Approach 2:
The reforming process creates a composite gas mixture containing hydrogen, carbon monoxide, and unreacted alcohol vapors. This composite fuel mixture combines the advantages of different components - hydrogen provides high flame speed and low ignition temperature, while CO and alcohol provide energy density, achieving superior combustion efficiency
2Reliability
If pure alcohol fuel is used, then renewable energy utilization is maximized, but cold start capability is lost due to insufficient vapor pressure
Solution Approach 1:
The reforming process is activated before main combustion begins, pre-converting liquid alcohol into combustible gas mixture. This preliminary action ensures that when cold start conditions exist, the engine already has a vaporized, combustible mixture ready for ignition, eliminating the vapor pressure problem
Solution Approach 2:
The reforming catalyst acts as an intermediary that facilitates the conversion of alcohol to combustible gases. This intermediary process enables cold start by creating ignitable gas mixture from liquid alcohol, while the controlled reforming reduces harmful emissions compared to direct combustion of alcohol-gasoline blends
3Reliability
If alcohol is blended with gasoline to enable cold start, then cold start capability is improved, but combustion efficiency decreases and emissions increase
Solution Approach 1:
The patent extracts the harmful emissions problem by separating the cold start function from the main fuel combustion. The reforming process specifically addresses cold start by producing combustible gases, while the main engine operation burns cleaner reformate, effectively taking out the emissions problem from the fuel system
Solution Approach 2:
The reforming process converts the harmful effect of low-temperature liquid alcohol (insufficient vapor pressure) into a benefit by thermally decomposing it into combustible gases. The same thermal energy that could be considered a loss is converted into useful combustible hydrogen and CO, turning potential harm into benefit
4Use of energy by moving object
If compression ratio is increased to improve thermal efficiency, then fuel efficiency improves, but knock resistance decreases with alcohol fuels
Solution Approach 1:
The reforming process fundamentally changes the chemical composition parameters of the fuel, converting alcohol into a mixture rich in hydrogen and CO. These components have superior knock resistance compared to alcohol, enabling the engine to operate at higher compression ratios and achieve improved thermal efficiency without knock problems
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 solution enhances the efficiency of alcohol fuel utilization, enabling cold start without gasoline blending and allowing for leaner air-fuel operation, improving thermal efficiency and reducing emissions by producing a high-octane fuel that can be combusted at higher compression ratios.
Implementation Method 1
a reforming catalyst with a copper-coated metal sponge structure that efficiently reforms alcohol fuels at low temperatures
Implementation Method 2
using waste heat from the engine exhaust to maintain the reformer temperature
Implementation Method 3
The partially reformed gas mixture is combined with air or another oxygen-containing gas and combusted to produce an exhaust gas mixture
Data Source
AI summary
Improved alcohol reforming processes and reformed alcohol power systems utilizing those processes are disclosed. In preferred embodiments, the alcohol reforming processes utilize a thermally conductive reforming catalyst that allows efficient, low-temperature reforming of an alcohol fuel to produce a reformate gas mixture comprising hydrogen. The present invention makes possible the efficient utilization of alcohol fuels in an internal combustion engine to generate electrical or mechanical power such as in vehicular applications.