Abstract A condensation-induced depressurization and steam purging technology has been recently developed to drive a continuous gas flow at a sub-atmospheric pressure. The technology is based on a continuous regeneration of depressurization by a system of two or multiple alternatively-operated chambers with steam condensation and refilling. Comparing with traditional methods, this new vacuum generation technology has a great potential of high energy conversion and utilization for an open-flow system. A complete operation cycle of each chamber undergoes three stages in sequence: vacuum generation by condensing pre-refilled steam, vacuuming gas from application system, and purging gas out of chamber while refilling steam. This paper presents a mechanistic model of process characteristics and parametric analysis for the thermodynamic cyclic operations. Each process stage has been separately modelled, and the complete cycle characteristics are then integrated by connecting these stages in series. The mechanistic model provides a parametric analysis capability for the optimized operation of the developed technology to vacuum driving continuous gas flows at sub-atmospheric pressures. The model result is compared with experiment data with good match. The parametric study of the steam purging process indicates that increasing the steam flowrate and pre-heating of chamber can effectively reduce the purging time required by 20–40%.

中文翻译：

---

冷凝减压的建模与热力循环分析

摘要 最近开发了一种冷凝诱导减压和蒸汽吹扫技术，以在低于大气压的压力下驱动连续气流。该技术基于通过具有蒸汽冷凝和再填充的两个或多个交替操作室的系统进行的连续减压再生。与传统方法相比，这种新型真空发生技术对于开流系统具有巨大的能量转换和利用潜力。每个腔体的完整运行循环依次经历三个阶段：通过冷凝预充蒸汽产生真空，从应用系统抽真空，以及在补充蒸汽的同时将气体从腔体中排出。本文提出了热力学循环操作的过程特性和参数分析的机械模型。每个过程阶段都单独建模，然后通过串联连接这些阶段来集成完整的循环特性。机械模型为开发技术的优化操作提供了参数分析能力，以在低于大气压的压力下真空驱动连续气流。模型结果与实验数据进行了比较，具有良好的匹配性。蒸汽吹扫过程的参数研究表明，增加蒸汽流量和腔室预热可以有效减少20-40%的吹扫时间。然后通过串联连接这些阶段来集成完整的循环特性。机械模型为开发技术的优化操作提供了参数分析能力，以在低于大气压的压力下真空驱动连续气流。模型结果与实验数据进行了比较，具有良好的匹配性。蒸汽吹扫过程的参数研究表明，增加蒸汽流量和腔室预热可以有效减少20-40%的吹扫时间。然后通过串联连接这些阶段来集成完整的循环特性。机械模型为开发技术的优化操作提供了参数分析能力，以在低于大气压的压力下真空驱动连续气流。模型结果与实验数据进行了比较，具有良好的匹配性。蒸汽吹扫过程的参数研究表明，增加蒸汽流量和腔室预热可以有效减少20-40%的吹扫时间。