液氨喷射泵热力性能的计算分析

doi:10.11949/0438-1157.20240086

摘要/Abstract

摘要：

为保证带有降膜蒸发器的制冷系统的正常运行，采用液氨喷射泵作为蒸发器中液氨的循环设备。基于动力学理论，编制了喷射泵的性能计算程序，分析了制冷系统中喷射泵的热力学性能，研究了操作参数对喷射泵性能的影响。结果表明，保持引射压力与出口压力不变，工作流体压力越高，喷射系数越大；工作流体温度越高，喷射系数越小。保持工作压力与出口压力不变，饱和引射压力越高，喷射系数越大，引射压力值越接近于出口压力值，喷射系数变化越显著。饱和引射液氨压力不变，出口压力越接近于引射液氨压力，喷射系数随工作液氨压力的升高增加程度越明显。

关键词: 氨, 喷射泵, 动力学理论, 热力学性能, 喷射系数

Abstract:

In order to ensure the normal operation of the refrigeration system with a falling-film evaporator, a liquid ammonia ejector pump is used as the circulating equipment for liquid ammonia in the evaporator. Based on the gas kinetic function method, the performance calculation program of the ejector pump is prepared, the thermal performance of the ejector pump in the refrigeration system is analyzed, and the influence of the operating parameters on the performance of the ejector pump is studied. The results show that, keeping the ejection pressure and outlet pressure unchanged, the higher the working fluid pressure, the larger the entrainment ratio; the higher the working fluid temperature, the smaller the entrainment ratio. Keeping the working pressure and outlet pressure unchanged, the higher the saturated ejection pressure is, the larger the entrainment ratio is, and the closer the value of the ejection pressure is to the value of the outlet pressure, the more significant the change of the entrainment ratio is. The saturated priming liquid ammonia pressure remains constant, and the closer the outlet pressure is to the priming liquid ammonia pressure, the more pronounced the increase in the entrainment ratio is with the increase in the working liquid ammonia pressure.

Key words: ammonia, jet pump, kinetic theory, thermal performance, entrainment ratio

中图分类号:

TK 2

杨艳, 郭亚丽, 于硕文, 潘泊年, 沈胜强. 液氨喷射泵热力性能的计算分析[J]. 化工学报, DOI: 10.11949/0438-1157.20240086.

Yan YANG, Yali GUO, Shuowen YU, Bonian PAN, Shengqiang SHEN. Calculation and analysis of thermal performance of R717 gas-liquid ejector[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240086.

图/表 8

图1 降膜蒸发器制冷系统简图

Fig.1 Schematic diagram of falling film evaporator refrigeration system

图2 喷射泵结构简图

Fig.2 Schematic diagram of jet pump structure

图3 喷射泵计算流程图

Fig.3 Jet pump calculation flow chart

图4 不同引射液氨压力下饱和液氨压力对喷射系数的影响

Fig.4 Influence of saturated ammonia pressure on entrainment ratio under different injection ammonia pressure

图5 不同引射液氨压力下工作液氨温度对喷射系数的影响

Fig.5 Influence of ammonia temperature on entrainment ratio under different injection ammonia pressure

图6 不同工作液氨压力下相同过冷度对喷射系数的影响

Fig.6 Influence of the same subcooling degree on the entrainment ratio under different working ammonia pressure

图7 不同出口压力下饱和工作液氨压力对喷射系数的影响

Fig.7 Influence of saturated working ammonia pressure on entrainment ratio under different outlet pressure

图8 不同工作压力下饱和引射液氨压力对喷射系数的影响

Fig.8 Influence of saturated ejector ammonia pressure on entrainment ratio under different working pressures

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