流体机械

2014, v.42;No.507(09) 5-9

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用于海水淡化的双螺杆膨胀压缩机热力性能研究
Study on the Performance of Twin-screw Expander-compressor Used for Seawater Desalination

张凯;高磊;董冰;邢子文;
ZHANG Kai;GAO Lei;DONG Bing;XING Zi-wen;Xi'an Jiaotong University;

摘要(Abstract):

为了研究用于机械压汽海水淡化系统的双螺杆蒸汽膨胀压缩机热力性能,建立了压缩机和膨胀机热力模型。根据已知参数求解压缩机喷水量和轴功率,膨胀机进气温度和质量流量,将计算结果与热力压汽淡化系统进行比较。通过改变压缩机进、排气压力和膨胀机进气压力,对膨胀压缩机进行变工况性能分析。结果显示,压缩机进、排气压力会对压缩机喷水量和轴功率产生不同影响;膨胀机进气压力决定进气温度的高低,且存在最佳值。
In order to study the thermal performance of twin-screw expander-compressor used for mechanical vapor compression seawater desalination system,the thermodynamic model of compressor and expander are built. Parameters like water spray mass flow rate and shaft power of the compressor,intake temperature and mass flow rate of the expander are calculated based on the known conditions,then the results are compared with thermal vapor compression seawater desalination system. Different compressor intake,exhaust pressure and expander intake pressure were chosen to analyze the variable condition performance of expandercompressor. The results show that the intake and exhaust pressure have different effects on shaft power and water spray mass rate of compressor; the intake pressure of the expander decides the intake temperature,and there exists an optimum value.

关键词(KeyWords): 海水淡化;双螺杆;膨胀压缩机;热力模型;变工况
desalination;twin-screw;expander-compressor;thermodynamic model;variable condition

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基金项目(Foundation): 海洋公益行业科研专项经费项目(201305011)

作者(Author): 张凯;高磊;董冰;邢子文;
ZHANG Kai;GAO Lei;DONG Bing;XING Zi-wen;Xi'an Jiaotong University;

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