Ammonia Heat-Exchange Cooling With Radiator-Assisted Hydrogen Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing internal combustion engines face challenges in using ammonia as a fuel due to slow combustion, require secondary combustion promoters, and hydrogen storage is unsafe and inefficient, while conventional catalytic converters lack sufficient surface area and sealing for on-board ammonia dissociation, and cooling systems impact aerodynamics and efficiency.
Innovation Solution
A system for heat-exchange between ammonia and engine coolant using a heat-exchange unit with a TPMS structure, a bypass valve, and an electronic control unit to manage coolant flow, enabling efficient ammonia cracking and hydrogen production without fossil fuels, and integrating ammonia as a heat-exchange medium for engine cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If ammonia is used as fuel in internal combustion engines, then zero CO2 emissions are achieved, but combustion speed is too slow for practical engine operation
Solution Approach 1:
The combustion process is segmented into two stages: first, a small amount of hydrogen is combusted to raise the temperature and create a high-speed flame front; second, ammonia combustion is initiated and accelerated by this hydrogen flame. This segmentation allows each fuel to perform its optimal function - hydrogen provides fast ignition and ammonia provides zero-emission sustained combustion.
Solution Approach 2:
Hydrogen acts as an intermediary substance that mediates between the ignition system and ammonia combustion. The hydrogen is introduced as a promoter fuel that facilitates ammonia combustion by creating a faster flame propagation medium, thereby enabling practical engine operation with zero CO2 emissions.
2Temperature
If conventional cooling systems with radiators are used, then engine cooling is achieved, but aerodynamic efficiency is reduced due to ambient airflow requirements
Solution Approach 1:
The ammonia cooling system uses the engine's own exhaust heat to vaporize liquid ammonia, which then expands through an expansion valve to provide cooling. The system is self-sufficient, using waste heat from the engine to drive the cooling cycle without requiring external ambient airflow or large radiators, thereby maintaining aerodynamic efficiency.
Solution Approach 2:
The cooling system exploits the phase transition of ammonia from liquid to gas. Liquid ammonia is vaporized by exhaust heat in the vaporizer, then the gaseous ammonia expands through an expansion valve, absorbing heat and providing cooling effect. This phase transition mechanism enables efficient cooling without conventional radiator airflow requirements.
3Quantity of substance
If catalytic converters are used for on-board ammonia dissociation, then hydrogen production is achieved, but insufficient surface area and sealing capability limit effectiveness
Solution Approach 1:
The patent employs a porous monolithic catalyst structure with high surface area to volume ratio. The porous architecture provides extensive catalytic surface area within a compact form factor, enabling effective ammonia dissociation. The porous structure also facilitates better gas distribution and contact with catalyst surfaces, improving hydrogen production efficiency and reliability.
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 provides zero CO2 emissions by using ammonia-derived hydrogen as fuel, ensures safe storage and handling, and improves engine cooling efficiency by minimizing ambient airflow reliance.
Implementation Method 1
a heat-exchange unit with a TPMS structure... enabling efficient ammonia cracking and hydrogen production... integrating ammonia as a heat-exchange medium for engine cooling
Implementation Method 2
a heat-exchange unit with a TPMS structure... integrating ammonia as a heat-exchange medium for engine cooling
Data Source
AI summary
The present invention relates, in general, to systems and methods for generating hydrogen from ammonia on-board vehicles, where the produced hydrogen is used as fuel source for an internal combustion engine along with ammonia. The present invention utilizes ammonia not only as a co-fuel for the engine, but also as a heat-exchange medium used by a cooling system that is supplemented by a radiator based on the temperature of the internal combustion engine.