Research on Stirling Powered Booster Pump for Reverse Osmosis Desalination
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摘要: 提出一种用于小型反渗透海水淡化新型增压装置，将β型自由活塞斯特林发动机与往复式活塞泵耦合成为自由活塞斯特林发动机驱动式增压泵。确定初始设计参数，建立结构原理图，利用实用等温模型建模，分析斯特林发动机内部工作参数；在确定斯特林发动机参数后利用伯努利方程和一维不稳定流动方程对往复泵进行建模，得出泵吸排水口压力以及泵腔内压力变化；研究了斯特林发动机热源温度对输出功的影响，排出管口压力影响因素；利用MATLAB软件对所建立模型求解计算。结果表明，本设备理论上满足设计初始工况要求并可正常运行。
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关键词:
- 自由活塞斯特林发动机 /
- 往复式活塞泵 /
- 增压泵 /
- 实用等温模型 /
- 伯努利方程
Abstract: This paper proposes a new supercharger for small reverse osmosis desalination, coupling a free piston Stirling engine with a reciprocating piston pump into a free piston Stirling engine driven booster pump. First, determine the initial design parameters and establish a structural schematic. Then, using the practical isothermal model modeling, the internal working parameters of the Stirling engine are analyzed. After determining the Stirling engine parameters, the reciprocating pump is modeled using the Bernoulli equation and the one-dimensional unstable flow equation, and the pumping and draining pressure and the pressure change in the pump chamber are obtained. At the same time, the influence of the temperature of the Stirling engine heat source on the output work and the influence factors of the discharge port pressure are studied. Then MATLAB software is used to solve the calculation of the established model. Finally, the output power and efficiency of the whole machine are calculated and compared with the initial set value. It is found that the device theoretically meets the initial working conditions of the design and can operate normally. -
表 1 斯特林发动机计算参数
参数及单位 数值 额定功率/kW 4 活塞行程/cm 5 活塞频率/(r·min−1) 960 工质质量/g 0.75 膨胀腔温度/K 1060 压缩腔温度/K 371 回热器温度/K 662.76 加热器温度/K 1120 冷却器温度/K 351 扫气容积比$\kappa $ 0.7 无益容积比$\chi $ 1.5 容积相位角${\alpha _V}$ ${{\text{π}} / 2}$ 温度比$\tau $ 0.35 膨胀腔最大容积/cm3 359.04 压缩腔最大容积/cm3 251.33 平均压力/MPa 6.57 最大压力/MPa 9.37 最小压力/MPa 4.46 加热器容积/cm3 158.34 回热器容积/cm3 188.50 冷却器容积/cm3 30.16 回热器集体长度/cm 9.86 回热器基体直径/cm 4.93 回热器集体填充系数 0.5 
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表 2 往复增压泵参数
参数及单位 数值 泵理论流量/(cm3·s−1) 833 泵排出管口直径/cm 3.5 泵吸入管直径/cm 5 配气活塞杆直径/cm 2 泵活塞直径/cm 4.32 排出管长/cm 50 吸入管长/cm 30 排出管到泵体中心轴距离/cm 10 吸入管到泵体中心轴距离/cm 30 排出口背景压力/MPa 5 吸入口背景压力/MPa 0.8
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