二级回热式氨水循环发电系统性能

A Study on the Performance of Two-Stage Regenerative Ammonia Water Circulating Power Generation System

利用二级回热式氨水循环发电系统回收柴油机排气余热;以系统热效率为优化目标,分析氨水基液浓度、蒸发压力、蒸发温度和冷却水温度等特征参数对氨水循环系统性能的影响。结果表明:在保持其中3个特征参数恒定的条件下,二级回热式氨水循环发电系统的热效率随着基液浓度的增大而下降,随着蒸发压力的增大而升高,随着蒸发温度的升高而先升高后趋于平稳,随着冷却水温度的升高而下降;当最优运行点性能参数为氨水基液浓度44%、蒸发压力4.0 MPa、蒸发温度214℃时,该二级回热式氨水循环发电系统的热效率最高达到11.52%。

A two-stage regenerative ammonia water circulating power generation system is used to recover the exhaust heat of the diesel engine.The system thermal efficiency is used as the optimization target to analyze the influence of the ammonia water base liquid concentration,evaporation pressure,evaporation temperature,cooling water temperature and other characteristic parameters on the performance of the ammonia water circulation system.The results show that the thermal efficiency of the two-stage regenerative system decreases with the increase of the concentration of the base liquid,increases with the increase of the evaporation pressure,and increases with the increase of the evaporation temperature,when the three characteristic parameters are kept constant.The thermal efficiency increases with the rise of the evaporation temperature at first,then stabilizes,and decreases with the rise of the cooling water temperature.When the ammonia base solution concentration reaches 44%,evaporation pressure reaches 4.0 MPa,and evaporation temperature reaches 214℃,the thermal efficiency of the system achieves the highest value of 11.52%.