预冷式蒸发空冷器中试实验装置系统分析计算及软件开发

发布时间：2018-11-20 14:15

【摘要】：节能减排是如今的大主题,炼油化工、化学工业、电力、冶金等行业响应号召,利用空冷器代替部分水冷器,取得明显成效,对空冷器自身的缺陷的改进这一课题,引起了很多研究者的兴趣。在经过多年的研究后,蒸发式空冷器作为一种新型的空冷器出现在人们的眼前,同时在众多行业中展现出它的高效能。然而,其入口温度有局限性,这就使得在蒸发式空冷器的前端加一段翅片干空冷的预冷式蒸发空冷器的出现成为了必然。本文探讨了预冷式蒸发空冷器的传热过程、传热类型以及对应的计算原理,以此对蒸发式空冷器中试装置实验系统进行了分析计算和工艺流程设计,并结合这两个内容,开发设计了计算机辅助软件——预冷式蒸发空冷器核算软件。将预冷式蒸发空冷器分为两段——干式空冷段和湿式蒸发空冷段进行计算。根据各段的气液相进出口流量和温度,将各段分为六种传热过程,每种过程分五种传热类型讨论。查询对应状态下的物性参数,进而根据每种传热类型的方法计算,根据实际的传热过程排列组合,得出预冷式蒸发空冷器整体的传热计算结果。在一套旧中试装置基础上进行改造,对预冷式蒸发空冷器中试实验装置进行了系统分析和设计。确定了实验方案为热水冷却实验和水蒸气冷凝实验,对工艺流程进行了设计并画出工艺流程图,对工艺过程的管道进行了管径设计并列出了管道一览表,对工艺过程的仪表显示及控制进行了设计及仪表选型并给出主要仪表一览表。建立中试实验装置的实验介质基础物性数据库和风机、水泵型号及参数数据库。结合传热计算原理和中试实验装置系统分析设计的过程,利用VC++6.0的MFC部分开发了适合预冷式蒸发空冷器中试实验装置系统的核算软件。软件在一定程度上囊括了不同的流体类型的多种过程的设计,适用性强;功能目录使得计算过程一目了然,界面友好,操作简单。在理论的基础上,还需结合实验来验证可靠性。
[Abstract]:Energy saving and emission reduction is a major theme today. Industries such as oil refining, chemical industry, electric power, metallurgy and so on have responded to the call to use air coolers instead of some water coolers, and have achieved remarkable results in improving the defects of the air coolers themselves. It has aroused the interest of many researchers. After many years of research, evaporative air cooler, as a new type of air cooler, appears in front of people, at the same time, it shows its high efficiency in many industries. However, the inlet temperature is limited, which makes it necessary to add a section of fin dry air cooled precooled evaporative air cooler to the front end of evaporative air cooler. In this paper, the heat transfer process, heat transfer type and the corresponding calculation principle of the precooled evaporative air cooler are discussed. The experimental system of the pilot plant of the evaporative air cooler is analyzed and calculated, and the technological process is designed in combination with these two contents. The computer aided software, precooled evaporative air cooler accounting software, is developed and designed. The precooled evaporative air cooler is divided into two sections: dry air cooling section and wet evaporative air cooling section. According to the inlet and outlet flow rate and temperature of gas and liquid phase, each segment is divided into six heat transfer processes, each of which is divided into five heat transfer types. According to the method of each heat transfer type and the arrangement and combination of the actual heat transfer process, the heat transfer calculation results of the whole precooled evaporative air cooler are obtained. Based on a set of old pilot plant, the system analysis and design of pilot test device for precooled evaporative air cooler are carried out. The experimental scheme was determined as hot water cooling experiment and steam condensation experiment. The technological process was designed and the process flow chart was drawn. The pipe diameter of the process was designed and the pipeline list was listed. The instrument display and control of the process are designed and the instrument selection is given, and the main instrument list is given. The basic physical property database of experimental medium and the database of fan, water pump type and parameter are established. Combined with the principle of heat transfer calculation and the process of system analysis and design of the pilot experimental device, an accounting software is developed by using the MFC part of VC 6.0, which is suitable for the pilot-scale experimental device system of the pre-cooled evaporative air cooler. To a certain extent, the software includes the design of various processes of different fluid types, which has strong applicability; the functional catalogue makes the calculation process clear at a glance, friendly interface and simple operation. On the basis of the theory, it is necessary to test the reliability with experiments.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE965

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