Lean-Burn Engine Aftertreatment Electric Heating Methane Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lean-burn natural gas engines produce methane emissions due to low exhaust gas temperatures, which cannot be effectively reduced without increasing fuel efficiency or producing additional unwanted emissions like NOx, as traditional methods require higher temperatures or fossil fuel-based heating sources.
Innovation Solution
A system comprising a lean-burn natural gas engine, an electric power supply component, and a heating component within an aftertreatment housing, where the electric power supply generates heat using low-carbon techniques to increase the exhaust gas temperature, enabling methane conversion without increasing NOx emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the air-to-fuel ratio is decreased to increase combustion temperature for methane conversion, then the exhaust gas temperature increases to enable conversion process, but fuel efficiency decreases and NOx emissions increase
Solution Approach 1:
An electric heating component is introduced as an intermediary device to heat the exhaust gas independently of the combustion process. This mediator allows the exhaust gas to reach the required temperature for methane conversion without altering the air-to-fuel ratio, thereby maintaining fuel efficiency and avoiding additional NOx emissions.
Solution Approach 2:
The patent replaces the mechanical/chemical approach of adjusting air-to-fuel ratio with an electrical heating system. Instead of using combustion control to raise exhaust temperature, an electric heater powered by low-carbon generation techniques is used to directly heat the exhaust gas, substituting thermal management from a combustion-based system to an electrically-based system.
2Temperature
If a heating component powered by fossil fuel is employed to increase exhaust gas temperature, then the temperature increases to enable conversion process, but additional carbon dioxide and NOx emissions are produced
Solution Approach 1:
The patent changes the energy source parameter of the heating system from fossil fuel-based to low-carbon generation techniques. By altering this fundamental parameter, the system achieves the required temperature increase while eliminating the harmful emissions associated with fossil fuel combustion, aligning with environmental protection goals.
3Object-generated harmful factors
If a higher air-to-fuel ratio is used in lean-burn engine to reduce NOx emissions, then NOx emissions decrease, but exhaust gas temperature decreases preventing effective methane conversion
Solution Approach 1:
The patent segments the temperature control function from the combustion process. The lean-burn combustion process is optimized for NOx reduction with high air-to-fuel ratio, while a separate electric heating component handles the temperature increase needed for methane conversion. This segmentation allows independent optimization of both objectives without compromise.
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 methane emissions in lean-burn natural gas engines by utilizing low-carbon generated heat to enhance exhaust gas temperature, facilitating methane conversion without increasing fuel inefficiency or producing additional pollutants.
Implementation Method 1
the heating component is configured to: generate, based on the electric power provided by the electric power supply, heat
Data Source
AI summary
An engine system includes a lean-burn natural gas engine, an electric power supply component, an aftertreatment housing, and a heating component within the aftertreatment housing. The lean-burn natural gas engine provides, when in operation, an exhaust gas that includes methane to an input end of the aftertreatment housing. The aftertreatment housing allows the exhaust gas to flow through the aftertreatment housing from the input end of the aftertreatment housing to an output end of the aftertreatment housing. The electric power supply component provides, to the heating component, electric power that is generated using one or more low-carbon generation techniques. The heating component generates, based on the electric power provided by the electric power supply component, heat, and provides the heat within the aftertreatment housing. This causes a percentage of methane in the exhaust gas that flows through the aftertreatment housing to be reduced.