关键词: 氢能；有机液态储氢；氢能发动机；废弃余热利用

Abstract: Hydrogen fuel has attracted much attention in the research field of hydrogen engines and power plants due to its advantages of zero carbon dioxide emissions and the ability to treat toxic gases such as NOX. However, the fuel conversion efficiency defined by the Carnot cycle cannot exceed 50%, which is a significant distance from conventional engines. For this purpose, the article constructs a hydrogen engine system that integrates compressed chamber air pressurization, internal combustion chamber hydrogen combustion expansion work, and low-grade waste heat energy recovery in the expansion chamber. The system adopts the method of storing hydrogen in organic liquid form, and establishes an efficient waste heat cascade utilization system based on the hydrogen internal combustion engine. High quality waste heat is used for hydrogen source dehydrogenation, and medium and low quality waste heat is subjected to Rankine cycle to achieve the cascade utilization of waste heat resources. The design of this system not only has important scientific research value, but also has profound impacts on multiple aspects such as economic, environmental, and social sustainable development.

Key words: Hydrogen; Organic liquid hydrogen storage; Hydrogen engine; Waste heat utilization