摘要
为降低造纸机干燥部的能耗,课题组提出了应用于闭式排风气罩的溴化锂吸收式热泵(Absorption Heat Pump, AHP)干燥系统模型。建立了干燥系统各关键部件的数学模型,利用MATLAB计算其设计工况及变工况性能,采用控制变量法研究冷凝温度与蒸发温度对系统热泵性能系数(Coefficient of Performance, COP)及[火用]效率(Exergy Efficiency)的影响规律。结果表明:设计工况下,系统热泵性能系数及[火用]效率分别为1.692和21.85%;随着冷凝温度升高,COP呈现显著下降趋势,系统[火用]效率呈上升趋势,且蒸发温度越高,COP下降幅度越大;随着蒸发温度升高,COP呈现显著上升趋势,系统[火用]效率呈下降趋势,且冷凝温度越低,COP下降幅度越大。因此,为优化系统热力学性能,需协同调控蒸发与冷凝温度,优先降低蒸发温度并适度控制冷凝温度,从而提升能量利用效率。
In order to reduce the energy consumption in the dryer section of paper machines,the research group proposed a model of a lithium bromide Absorption Heat Pump(AHP)drying system applied to a closed exhaust hood.Mathematical models were developed for each key component of the drying system.MATLAB facilitated calculations of its design condition and off-design performance.Employing the controlled variable method,the study investigated the influence laws of condensation temperature and evaporation temperature on the Coefficient of Performance(COP)and exergy efficiency of the system heat pump.The results indicate that under design conditions,the system COP and exergy efficiency reach 1.692 and 21.85%respectively;with increasing condensation temperature,COP shows a significant downward trend while the system exergy efficiency exhibits an upward trend;higher evaporation temperatures correspond to a larger decrease in COP.Conversely,rising evaporation temperature leads to a significant increase in COP but a decrease in system exergy efficiency;lower condensation temperatures correspond to a larger decrease in COP.Therefore,in order to optimize the system′s thermodynamic performance requires coordinated control of evaporation and condensation temperatures,prioritizing a reduction in evaporation temperature while moderately controlling condensation temperature to enhance energy utilization efficiency.
作者
潘钊
严彦
王伟超
PAN Zhao;YAN Yan;WANG Weichao(School of Mechanical and Electrical Engineering,Xi′an Polytechnic University,Xi′an 710048,China)
出处
《轻工机械》
2025年第4期90-95,共6页
Light Industry Machinery
基金
陕西省自然科学基础研究计划资助项目(2023-JC-ON-0154)
国家留学基金委(CSC)项目(202208610115)。
关键词
造纸机
干燥部
吸收式热泵
闭式排风气罩
热力性能
paper machine
drying department
AHP(Absorption Heat Pump)
closed exhaust hood
thermal performance
