机械蒸汽压缩机模型及其与风力发电机耦合模拟研究

机械蒸汽压缩海水淡化是一种很有前景的消纳风能的方式,其中的压缩机是这种能源利用方式的核心部件。建立了离心式蒸汽压缩机数学模型,研究了压缩机性能参数间的关系,重点探讨了压缩机输入功率及吸气蒸汽参数与压缩机流量、压比和转速间的关系,并通过耦合风力发电机模型,研究了定压比条件下,压缩机流量和转速在风力发电机随机功率变化时的响应曲线。结果表明,风力发电机驱动的机械蒸汽压缩机需要辅助能源来保证在较小的风力发电机输入功率情况下,压缩机能稳定运行在非喘振区。对于额定功率为160 k W的压缩机,在压比2.4条件下的最小输入功率为50 k W。

Modeling study of mechanical vapor compressor and its coupling with a wind power generator

Seawater desalination using mechanical vapor compressor is one of the most promising technology to consume the wind power energy. The vapor compressor is the core unit. A centrifugal compressor used for vapor compression is modeled and the relationships between the performance parameters of the compressor is studied. The changes of mass flux, compression ratio and the speed of the compressor with the input power are discussed. The compressor model is finally coupled with a wind-power generator and the corresponding mass flux and speed of the compressor at a constant compression ratio with the random changed wind power is examined. The results show that an auxiliary energy source is needed to assistant the compressor run out of the surge region under the condition of much smaller power input at small wind velocity. For a compressor with a nominal power of 160kW , the minimum required input power is about 50 kW at the compression ratio of 2.4.