蒸发式空冷器传热过程研究及SPSS建模

发布时间：2018-05-29 20:47

  本文选题：蒸发式空冷器 + 传热传质　； 参考：《华中科技大学》2015年硕士论文

【摘要】：在现代社会,能源消耗,环境影响和日益完善的环境法律都迫使人们减少能源需求量,这样,就需要人们开发更高能源利用率的设备。蒸发式空冷器是一种将水冷与空冷、传热与传质过程融为一体且兼有两者之长的新型冷凝冷却设备。它具有结构紧凑、传热效率高、投资省、操作费用低、占地面积小及安装、维护方便等优点,在炼油、化工、冶金、制冷等行业中有着广阔的应用前景,是空冷技术发展的新方向,然而其应用缺乏充分的实验数据和理论设计作为指导依据。蒸发式空冷器传热传质过程是非常复杂的,本文首先对传热传质过程进行了较为深入的分析,选取一个理想化的微元控制体,利用物料衡算和能量衡算分析,以此加深对蒸发式空冷器传热传质过程的认识。基于此,建立了蒸发式空冷系统小试装置,以多氯联苯作为工艺介质,探讨了工艺介质流量、工艺介质进口温度、喷淋水量和空气流量对系统传热性能的影响。发现只有风机与喷淋水量达到一个最优配比时,才能够最大限度的发挥蒸发式空冷器的特点。在风机频率为40Hz、喷淋水频率为15Hz左右时,二者能够最佳耦合;而在工艺介质进口温度为45℃,工质流量为45Hz,喷淋水流量为17.9Hz和风机频率为50Hz时,系统有最大的管外联合传热系数。从统计分析的角度,结合管外联合传热系数的概念,利用IBM SPSS软件,通过多元线性回归分析,研究对管外给热系数具有显著影响的因素,得到管外联合传热系数传热模型。对比分析得出模型4是最优的,模型校验发现,实验测量值与模型计算值的相对误差均在±13%以内,表明模型4具有较好的正确性。
[Abstract]:In modern society, energy consumption, environmental impact and increasingly perfect environmental laws force people to reduce energy demand, so people need to develop more energy-efficient equipment. Evaporative air cooler is a new type of condensing and cooling equipment, which combines water and air cooling, heat and mass transfer processes, and has the length of both. It has the advantages of compact structure, high heat transfer efficiency, low investment, low operating cost, small area of occupation, easy installation and maintenance, etc. It has a broad application prospect in oil refining, chemical industry, metallurgy, refrigeration and other industries. It is a new direction in the development of air cooling technology. However, its application lacks sufficient experimental data and theoretical design as the guidance basis. The heat and mass transfer process of evaporative air cooler is very complicated. Firstly, the heat and mass transfer process is analyzed deeply in this paper. An idealized micro-element control body is selected, and the material balance and energy balance are used to analyze the heat and mass transfer process. In order to deepen the understanding of the evaporative air cooler heat and mass transfer process. Based on this, a pilot test unit of evaporative air cooling system was established. The effects of flow rate, inlet temperature, spray water and air flow rate on the heat transfer performance of the system were discussed with polychlorinated biphenyls (PCBs) as the process medium. It is found that the characteristics of evaporative air cooler can be maximized only when the fan and sprinkler reach an optimal ratio. When the frequency of fan is 40 Hz and the frequency of spray water is about 15Hz, the two can be best coupled, while when the inlet temperature of process medium is 45 鈩，

本文编号：1952336