基于MWorks的空分系统预冷流程的研究与仿真
发布时间：2018-08-30 20:12
【摘要】：随着国民经济的发展，空分装置大型化和低能耗化成为了未来发展趋势。预冷流程作为空分装置中一个重要的环节，其流程组织及单体设备性能对整个空分装置影响重大，因此预冷流程也成为了一个热门的研究课题。而空冷塔和水冷塔作为预冷流程的两个核心部件，对其大型化和低能耗化的研究则成为了重中之重。围绕这个主题，本文展开了以下几个方面的研究。 以预冷流程的组织形式为出发点，分析了用户对产品需求量不同对预冷流程组织形式影响。通过查阅文献，分析对比两大核心设备的三种传热传质理论模型，从而建立本文空冷塔、水冷塔的气-水接触传热数学模型。基于MWorks平台，使用统一建模语言Modelica语言，构建结构仿真程序。不仅简化编程时间，同时增强了程序的可移植性。同时通过对比文献数据和程序仿真结果，来验证程序的可靠性。 提出另一种数学建模，通过微元段内能量守恒，传热速率方程和传质速率方程的迭代，不仅可以消除Merkel模型中气-水物性为常量的假设，使数学模型更接近实际，而且还可以显示塔内温湿度沿流动方向的变化曲线。并对12万空分装置进行实例仿真计算，同时分析了空分装置操作计算时，工况变化时对空冷塔、水冷塔的温湿度参数仿真模拟，并为变工况操作提出的一些可行性建议。
[Abstract]:With the development of national economy, large-scale air separation unit and low energy consumption become the trend of future development. As an important part of air separation unit, precooling process has great influence on the whole air separation unit, so the precooling process has become a hot research topic. Air cooling tower and water cooling tower as two core components of the precooling process, the study of its large scale and low energy consumption has become the most important. Around this theme, this article has carried out the following several aspects of research. Based on the organizational form of precooling process, the influence of different product demand on the organizational form of precooling process is analyzed. By referring to the literature and analyzing and comparing the three theoretical models of heat and mass transfer between the two core equipments, the mathematical model of gas-water contact heat transfer in the air-cooled tower and water-cooled tower is established in this paper. Based on the MWorks platform, the structure simulation program is constructed by using the Unified Modeling language (Modelica). It not only simplifies the programming time, but also enhances the portability of the program. At the same time, the reliability of the program is verified by comparing the literature data and the program simulation results. In this paper, another mathematical model is proposed. By iteration of energy conservation, heat transfer rate equation and mass transfer rate equation in microelement, not only the assumption that gas-water property is constant in Merkel model can be eliminated, but the mathematical model is closer to reality. The temperature and humidity curves along the flow direction can also be shown. At the same time, the temperature and humidity parameters of the air cooling tower and the water cooled tower are simulated when the operating conditions of the air separation unit are changed, and some feasible suggestions for the operation of the air separation unit are put forward.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657
本文编号：2214161
[Abstract]:With the development of national economy, large-scale air separation unit and low energy consumption become the trend of future development. As an important part of air separation unit, precooling process has great influence on the whole air separation unit, so the precooling process has become a hot research topic. Air cooling tower and water cooling tower as two core components of the precooling process, the study of its large scale and low energy consumption has become the most important. Around this theme, this article has carried out the following several aspects of research. Based on the organizational form of precooling process, the influence of different product demand on the organizational form of precooling process is analyzed. By referring to the literature and analyzing and comparing the three theoretical models of heat and mass transfer between the two core equipments, the mathematical model of gas-water contact heat transfer in the air-cooled tower and water-cooled tower is established in this paper. Based on the MWorks platform, the structure simulation program is constructed by using the Unified Modeling language (Modelica). It not only simplifies the programming time, but also enhances the portability of the program. At the same time, the reliability of the program is verified by comparing the literature data and the program simulation results. In this paper, another mathematical model is proposed. By iteration of energy conservation, heat transfer rate equation and mass transfer rate equation in microelement, not only the assumption that gas-water property is constant in Merkel model can be eliminated, but the mathematical model is closer to reality. The temperature and humidity curves along the flow direction can also be shown. At the same time, the temperature and humidity parameters of the air cooling tower and the water cooled tower are simulated when the operating conditions of the air separation unit are changed, and some feasible suggestions for the operation of the air separation unit are put forward.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657
【相似文献】
相关硕士学位论文 前2条
1 陈昭京;基于MWorks的空分系统预冷流程的研究与仿真[D];华中科技大学;2014年
2 罗思璇;基于MWorks软件的表面式蒸发器仿真与研究[D];华中科技大学;2013年
，本文编号：2214161
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