耦合制冷剂回流压缩的吸收式热泵回收低温余热性能  

Performance of absorption heat pump coupled with reflux refrigerant compression for low-temperature waste heat recovery

作　　者：徐琼 杜勇博 李宁宁 车得福[1] XU Qiong;DU Yongbo;LI Ningning;CHE Defu(State Key Laboratory of Multiphase Flow in Power Engineering,School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,Shaanxi Province,China;Hebei Special Equipment Supervision and Inspection Research Institute,Shijiazhuang 050024,Hebei Province,China)

机构地区：[1]西安交通大学能源与动力工程学院动力工程多相流国家重点实验室,陕西西安710049 [2]河北省特种设备监督检验研究院,河北石家庄050024

出　　处：《化学工程》2025年第4期77-82,共6页Chemical Engineering(China)

基　　金：陕西省重点研发计划项目(2023-YBGY-287);河北省市场监督管理局科技计划项目(2023ZC23)。

摘　　要：采用溴化锂吸收式热泵回收燃气锅炉出口的烟气余热时,由于排烟温度较低,烟气显热量不足,往往需要引入外部高温热源为发生器提供驱动热源,严重影响了锅炉系统的经济性和适应能力。针对这个问题,采用一种并联的吸收压缩式热泵系统,通过增加压缩机使部分蒸发器出口的制冷剂进行压缩后进入冷凝器,减少发生器中所需的驱动热量。模拟结果表明:改进系统通过消耗33.70 kW的电能,可从160℃的烟气中回收271.97 kW的余热,最终烟气冷却至30.04℃,烟气中水蒸气冷凝率接近80%。此外还研究具有不同制冷剂分流比系统的运行性能,以及不同进口烟温、回水温度下热泵系统的能效特性,为热泵系统的设计与运行提供理论指导。In the recovery of flue gas waste heat from a gas boiler using a lithium bromide absorption heat pump,the low exhaust temperature and insufficient sensible heat of the flue gas often necessitate the introduction of an external heat source to provide an additional generator-driven heat source,which seriously affects the economy and adaptability of the boiler.To address this issue,an improved heat pump system was adopted,in which a portion of the gaseous refrigerant at the outlet of the evaporator was compressed by adding a compressor and then entered into the condenser,thus reducing the required driving heat in the generator.The simulation results demonstrate that the system can recover 271.97 kW flue gas of waste heat through the consumption of 33.70 kW of electrical energy.The final flue gas is cooled to 30.04℃,with the flue gas in the water vapor condensation rate of nearly 80%.In addition,the energy efficiency characteristics of the heat pump system was examined at varying refrigerant diversion ratios,boiler outlet flue temperature and return water temperature,thereby providing a reference point for actual operation.

关 键 词：热力学 模拟 天然气 热泵 余热回收 

分 类 号：TK115[动力工程及工程热物理—热能工程]