摘要
公路运输领域的节能减排是实现碳中和战略的重要环节。重型商用车辆功率以及续航需求大,由传统燃油车型向混合动力转型并进行余热回收利用对提升发动机效率、降低能耗具有重要意义。但目前的研究中与混合动力耦合的余热回收系统的结构简单,仅能回收缸套水或烟气单一形式的余热能,对车辆整体效率的提升程度有限。因此提出了一种基于有机朗肯循环的能够同时回收烟气及缸套水余热并在全工况下高效运行的余热回收系统。将其与串联式混合动力系统耦合,并在高速、城郊道路工况下运行,深入探究了有机朗肯循环系统性能表现以及耦合系统整体能效提升效果。结果表明在考虑余热回收系统质量的前提下,该余热回收系统在高速路况USHWY对发动机效率的提升为2.85%,降低整体燃油消耗6.78%,在城郊路况UDDS下提升发动机效率2.30%,整体燃油消耗降低6.43%,证明了系统的节油能力和应用潜力。研究发现有机朗肯循环系统工作惯性大,发动机的长期稳定运行对于提升系统输出功率和效率具有决定性作用,因此该系统适合匹配高速运行的重型混合动力车辆。
Energy saving and emission reduction in road transport field is an important part of the strategy to achieve carbon neutrality.Heavy commercial vehicles have high power and range requirements,and the transition from conventional internal combustion locomotives to hybrids with waste heat recovery is of great significance in improving engine efficiency and reducing energy consumption.However,the waste heat recovery system integrated with hybrid power in current research mostly adopts a simple layout,and only recovers a single form of waste heat energy from the cylinder liner water or flue gas,which has a limited degree of enhancement to the overall efficiency of the vehicle.Therefore,a waste heat recovery system based on the organic Rankine cycle that can simultaneously recover the waste heat from flue gas and cylinder liner water and operate efficiently under full operating conditions is proposed.The system is coupled with a series hybrid power system and operates under high-speed and suburban road conditions,the performance of the organic Rankine cycle system and the improvement effect of the overall energy efficiency of the integrated system are then investigated.The results show that,under the premise of considering the weight of the waste heat recovery system,the waste heat recovery system improves the engine efficiency by 2.85%and reduces the overall fuel consumption by 6.78%under high-speed USHWY conditions.Under urban road UDDS conditions,it enhances the engine efficiency by 2.30%and decreases the overall fuel consumption by 6.43%.The above results demonstrate the system’s fuel-saving capability and application potential.It is found that the organic Rankine cycle system has a large inertia,and the long-term stable operation of the engine plays a decisive role in improving the output power and efficiency of the system,so the system is suitable for matching with high-speed operation of heavy-duty hybrid vehicles.
作者
王轩
殷艺玮
王竞宇
田华
舒歌群
张轩昂
WANG Xuan;YIN Yiwei;WANG Jingyu;TIAN Hua;SHU Gequn;ZHANG Xuanang(School of Mechanical Engineering,Tianjin University,Tianjin 300072,China;College of Engineering Science,University of Science and Technology of China,Hefei 230027,China)
出处
《热力发电》
CAS
CSCD
北大核心
2024年第7期149-158,共10页
Thermal Power Generation
基金
国家重点研发计划项目(2022YFE0100100)。
关键词
有机朗肯循环
余热回收
混合动力
重型卡车
organic Rankine cycle
waste heat recovery
hybrid power
heavy trucks
