Engine Reformer for Lean Operation and NOx Reduction
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Solution Overview
Problem
Existing engine systems that utilize reformed fuel face challenges in reducing NOx emissions and efficiently transitioning between fuel forms during engine operation, particularly in starting and maintaining optimal reformer performance.
Innovation Solution
An engine system that employs a reformer to generate hydrogen through a hydrogen-assisted lean operation scheme, using a fuel delivery system with a compressor, oxidant, and catalyst to reform fuel into hydrogen and carbon monoxide, with temperature control and venting mechanisms to manage fuel flow and emissions, allowing for transition from unreformed to reformed fuel and back.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If fuel is reformed to generate hydrogen for lean operation, then engine efficiency and NOx reduction are improved, but system complexity and difficulty of transitioning between fuel forms increase
Solution Approach 1:
The reformer system is designed to perform multiple functions: it can process different fuel types (natural gas, propane, diesel), operate in different modes (continuous reforming, startup reforming), and provide both reformed and unreformed fuel to the combustion chamber. This multi-functionality allows a single system to address emissions reduction while maintaining operational flexibility across various operating conditions.
Solution Approach 2:
The system dynamically adjusts the ratio of reformed fuel to unreformed fuel based on operating conditions. During startup, the system transitions from 100% unreformed fuel to increasing proportions of reformed fuel as the reformer reaches operating temperature. The control system continuously modulates fuel flow rates and air-to-fuel ratios to optimize performance while managing the complexity of fuel transitions.
2Reliability
If the reformer is started before the engine, then reformer performance is optimized, but the system requires additional heating infrastructure and coordination
Solution Approach 1:
The reformer is started and brought to operating temperature before the engine begins operation. Electric heaters are activated during the pre-start phase to heat the reformer catalyst and internal components to the required temperature range. This preliminary heating ensures that when fuel is introduced, the reformer is already in optimal operating condition, eliminating the need for complex thermal management during engine startup.
Solution Approach 2:
Traditional mechanical heating methods (such as flame heating or heat exchangers requiring external fuel sources) are replaced with electric heating elements. This substitution simplifies the heating infrastructure by eliminating the need for additional fuel delivery systems, temperature sensors, and thermal coupling mechanisms, while providing precise temperature control through electrical power regulation.
3Ease of operation
If the engine is started before the reformer, then the system is simpler to operate, but the reformer may not reach optimal temperature for efficient hydrogen generation
Solution Approach 1:
The reformer system incorporates self-heating capabilities through electric heaters that are automatically activated when the reformer temperature falls below the threshold required for efficient reforming. Once the reformer reaches operating temperature, the heaters are automatically deactivated. This self-service approach maintains high hydrogen generation efficiency without requiring continuous external heating or complex manual temperature management.
Solution Approach 2:
Temperature sensors continuously monitor the reformer's internal temperature and provide feedback to the control system. Based on this feedback, the control system automatically adjusts the heater power output to maintain the reformer within the optimal temperature range for hydrogen generation. This closed-loop control ensures efficient reforming performance while simplifying operator intervention, as the system self-regulates based on real-time temperature conditions.
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
The system effectively reduces NOx emissions and improves engine efficiency by generating hydrogen for lean operation, enabling smooth transitions between fuel forms and optimizing reformer performance, thus enhancing engine operation and emissions control.
Implementation Method 1
a reformer (34) configured to receive the oxidant and fuel, and to reform the fuel
Implementation Method 2
the reformer is configured to receive the oxidant and fuel received from the source of fuel and to reform the fuel
Data Source
Figure 1
AI summary
One embodiment of the present invention is a unique method for operating an engine. Another embodiment is a unique engine system. Other embodiments include apparatuses, systems, devices, hardware, methods, and combinations for engines and engine systems. Further embodiments, forms, features, aspects, benefits, and advantages of the present application will become apparent from the description and figures provided herewith.