基于热力学理论液环压缩系统设计方法及工程应用

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doi:10.13385/j.cnki.vacuum.2020.05.17

摘要： 文章分析了液环真空泵和液环压缩机工作原理和过程,第一次提出真空泵和压缩机不同的设计理念。分析了液环泵几何设计方法,提出以能量传输和转化为设计基础,采用能量转化计算方法设计液环压缩机,以工艺需用的气体变化为准则,转化成为压缩机差压、压缩比等设计输入,建立能量转化基础的数学模型。通过液环动能向压力势能转化确定压缩机必需的动能相适应的结构,提供压缩机结构的基础参数。通过理论计算,给出了压缩机可实现最高压力趋势线。这种设计方法应用,液环压缩机可以实现不同的排口压力,并且可以实现真空-压力的综合、复合利用。结合工程实践提出了压缩机个性化,实现安全、节能的建议。文章建议采用系统方法考核液环压缩的指标,促进工程实用、压缩机技术发展。

关键词: 液环真空泵, 液环压缩机, 能量转换, 叶轮顶端速度, 气体回收, 真空-压缩系统, 化学气体输送, 系统能效评估

Abstract: The paper analyzes the working principle and process of the liquid ring vacuum pump and the liquid ring compressor. It is the first time that the different design concepts of the vacuum pump and the compressor are put forward. The geometric design method of the liquid ring pump is analyzed. Based on the energy transfer and conversion, the liquid ring compressor is designed by the energy conversion calculation method. According to the change of the gas required in the process, it is transformed into the design input of differential pressure and compression ratio of the compressor, and the mathematical model of the energy conversion foundation is established. By transforming the kinetic energy of the liquid ring into the pressure potential energy, the necessary kinetic energy suitable structure of the compressor is determined, and the basic parameters of the compressor structure are provided. Through theoretical calculation, the trend line of compressor's maximum pressure is given. The application of this design method shows that the liquid ring compressor can realize different outlet pressure, and can realize the comprehensive and compound utilization of vacuum-pressure. Combining with engineering practice, the suggestion of compressor individualization, safety and energy saving is put forward. It is suggested that the index of liquid ring compression should be checked by systematic method to promote engineering practicality and compressor technology development.

Key words: vacuum pump, compressor, energy conversion, tip velocity of impeller, gas recovery, vacuum-compression system, chemical gas transportation, system energy assessment

中图分类号:

V216.5+7

徐法俭, 黄志婷, 刘宝新. 基于热力学理论液环压缩系统设计方法及工程应用[J]. 真空, 2020, 57(5): 79-84.

XU Fa-jian, HUANG Zhi-ting, LIU Bao-xin. Design Method and Engineering Application of Liquid Ring Compression System Based on Thermodynamics Theory[J]. VACUUM, 2020, 57(5): 79-84.

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