溶剂汽相干燥处理是大型油浸式电力变压器生产和维修过程中最重要的工艺过程之一。本文首先详细介绍了移动式溶剂汽相干燥技术的工作原理、设备系统组成、以及生产工艺流程。在对移动式溶剂汽相干燥设备及流程做了必要的简化和假设基础...溶剂汽相干燥处理是大型油浸式电力变压器生产和维修过程中最重要的工艺过程之一。本文首先详细介绍了移动式溶剂汽相干燥技术的工作原理、设备系统组成、以及生产工艺流程。在对移动式溶剂汽相干燥设备及流程做了必要的简化和假设基础上,论文建立了一个包括40个数学方程的热质传递数学模型,完整地表征了工艺过程中溶剂、水、空气三种介质的相变与迁移过程的热力学规律,详细地描述了设备关键单元和流程中温度、压力、流量等重要物理量间的定量关系。采用Matlab软件编程,以一个来自生产现场的500 k V/750 MVA变压器处理的实际工艺过程为例,开展了一个完整工艺处理过程的模拟计算,获得了干燥工艺过程中器身温度、油箱内压力、出水量等关键工艺参数随时间变化的关系曲线。对照实际生产记录数据,发现理论模拟结果与实际数据在变化趋势上十分吻合,验证了所建立模型的正确性。该模型的应用,将有希望为干燥工艺过程控制和结果预测提供理论依据。可供相关技术人员,在改进设备的结构设计和优化工艺运行时,参考借鉴。展开更多
The formations of desiccation cracks and their pattems in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal dropl...The formations of desiccation cracks and their pattems in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name ＂daisy＂ and ＂wavy-ring＂, are identified in the drying droplets. We explore the shifting of crack patterns from the ＂daisy＂ to the ＂wavy-ring＂ by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the ＂wavy-ring＂ crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications.展开更多
文摘溶剂汽相干燥处理是大型油浸式电力变压器生产和维修过程中最重要的工艺过程之一。本文首先详细介绍了移动式溶剂汽相干燥技术的工作原理、设备系统组成、以及生产工艺流程。在对移动式溶剂汽相干燥设备及流程做了必要的简化和假设基础上,论文建立了一个包括40个数学方程的热质传递数学模型,完整地表征了工艺过程中溶剂、水、空气三种介质的相变与迁移过程的热力学规律,详细地描述了设备关键单元和流程中温度、压力、流量等重要物理量间的定量关系。采用Matlab软件编程,以一个来自生产现场的500 k V/750 MVA变压器处理的实际工艺过程为例,开展了一个完整工艺处理过程的模拟计算,获得了干燥工艺过程中器身温度、油箱内压力、出水量等关键工艺参数随时间变化的关系曲线。对照实际生产记录数据,发现理论模拟结果与实际数据在变化趋势上十分吻合,验证了所建立模型的正确性。该模型的应用,将有希望为干燥工艺过程控制和结果预测提供理论依据。可供相关技术人员,在改进设备的结构设计和优化工艺运行时,参考借鉴。
基金supported by the National Natural Science Foundation of China(Grant Nos.U1562105,11372313)the Chinese Academy of Sciences through CAS Interdisciplinary Innovation Team Project+1 种基金the Chinese Academy of Sciences Key Research Program of Frontier Sciences(Grant No.QYZDJ-SSW-JSC019)the Chinese Academy of Sciences Strategic Priority Research Program(Grant No.XDB22040401)
文摘The formations of desiccation cracks and their pattems in drying droplets of protein solutions are studied experimentally. The solvent evaporation causes the dehydration self-organization phenomenon in colloidal droplets, followed by the formations of desiccation cracks. Two categories of highly ordered crack patterns, which we name ＂daisy＂ and ＂wavy-ring＂, are identified in the drying droplets. We explore the shifting of crack patterns from the ＂daisy＂ to the ＂wavy-ring＂ by varying the concentration of protein droplets. The results show that the concentration correlates with the pattern of deposition film directly, and modulates the periodicity of the crack pattern. We investigate the formations and periodicities of these two kinds of crack patterns, and obtain the scaling law of periodicity of the ＂wavy-ring＂ crack pattern. The relationship between the deposition pattern and the highly ordered crack patterns is also examined. This study will help in understanding the formation mechanisms of crack patterns in drying droplets of protein solutions and assist the future design of crack patterns in practical applications.
