通过朗肯循环回收内燃机余热的技术(英文)

A Research of IC Engine Waste Heat Recovery by Rankine Cycle Technologies

介绍了内燃机余热回收领域的最新研究进展,分析了通过组织动力循环如有机朗肯循环进行热功转化的技术。首先研究了内燃机可回收余热的分布状况,然后对循环工质选择和膨胀机选型这2 个最关键的技术环节进行深入讨论,介绍了工质选择的基准和最新的膨胀机研究进展。最后讨论目前代表性的几家研究机构提供的具有不同概念的系统设计。前期研究结果表明,通过余热回收的方式最高可以提高系统效率达 30%以上,是一种有效的节能减排技术。

For traditional internal combustion （IC） engines, which are still employed as the power source of over 95% vehicles, only less than 30% input energy is used for effective work—over 70% energy is dispersed with coolant and exhaust gas. With the surge of fuel price, in conjunction with the urgent requirement of CO2 emission reduction, a large number of researches have been focusing on the technologies to recover waste heat from IC engines, as it has become extremely difficult to significantly improve IC engine efficiency solely by engine optimisation. This paper aims to introduce pilot research results in the IC engine waste heat recovery area, mainly on the technologies using power cycles such as Organic Rankine Cycle. The available IC engine waste heat source distribution will be introduced, followed by a thorough discussion of working fluid and expander selection, which are the two key components of the power cycle. The criteria of working fluid selection will be provided and the latest expander technologies will be introduced. At last, the system designs from previous researchers will be introduced to provide the different design concepts. The research results suggested that the maximum efficiency enhancement by waste heat recovery system could achieve over 30%.