摘要
回收天然气内燃机的排气余热是提高能源利用率的有效手段。提出一种回收排气余热的朗肯循环耦合吸收式制冷循环的联产系统,并针对内燃机多变工况特点,构建联产系统的变工况仿真模型开展变工况特性研究。结果表明,当内燃机工况从100%下降到40%时,联产系统的当量效率下降2.14%,系统总能效率增量仅下降1.64%,说明此联产系统具有很好的工况适应性。在40%工况下,制冷循环由于溴化锂溶液的结晶而不能正常运行。研究结果为联产系统的实际运行提供理论指导。
Recovering exhaust waste heat of gas fuel engines is an effective way to improve energy utilization rate. A cogeneration system inclusive of a steam Rankine cycle and an absorption refrigeration cycle is proposed to recover exhaust waste heat of a gas fuel engine. An off-design simulation model is established to analyze part-load performance of the cogeneration system in connection with the characteristics of variable engine load. The results show that the equivalent efficiency of cogeneration system is reduced by 2.14% when the engine load drops from 100% to 40%. Moreover, the improvement of system＇s total efficiency reduces by only 1.64%. Therefore, the cogeneration system shows excellent part-load adaptability. It should be noted that the absorption refrigeration cycle cannot operate normally under 40% engine load due to the crystallization of H2 O-Li Br solution, which can provide the reference for the practical operation.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2018年第2期792-800,共9页
CIESC Journal
基金
国家自然科学基金项目(51676133)~~
关键词
余热回收
朗肯循环
吸收式制冷循环
数学模拟
变工况
结晶
waste heat recovery
Rankine cycle
absorption refrigeration cycle
mathematical modeling
part-load
crystallization
