LNG绕管换热器计算方法及其换热网络优化研究
发布时间：2018-10-17 13:32
【摘要】：天然气是现今世界越来越重要的能源,随着石油危机的不断加深,天然气作为一种比较清洁且储量丰富的能源,其发展不断加快,各项研究也不断出现新的成果。现阶段主要的研究内容有两方面,一方面是对低温换热器的研究,使基础的工业能够始终适应技术层面的发展要求;另一方面就是LNG冷能利用的研究,LNG的冷量是十分巨大且品位很高的,对其充分的利用不仅是能源节约的要求,更是各种产业相结合的一个契机。我国的天然气研究在各方面都尚处于起步阶段,虽然前景十分远大,但需要解决的问题还有很多,特别是在基础研究方面有很大的空缺亟待填补。本文对低温LNG换热器和LNG换热网络进行了研究,主要的内容包括:(1)对绕管式换热器的结构进行了深入了解,其在国内和国外应用的大概情况也做了相应的调查,并对整体设计计算方法进行了阐述.(2)提出一种计算换热面积的简捷计算方法,并与某实际应用实例进行对比,结论显示此计算方法在工程的范围内,在适当条件下是比较适用的。(3)对换热网络的基本概念进行说明,并罗列出几种主要的设计方法,找出目前相对比较准确的方法也就是夹点分析法。(4)对LNG船舶的冷能利用换热网络进行设计计算,并比较两种可能的换热网络,最终选出相对最优的结果,对夹点温度和总费用之间的关系进行讨论,得出允许范围内夹点温度越低,投资越少的结论。本文所提出的换热器面积简介计算方法和对换热网络的优劣分析对换热网络设计和优化的研究具有一定的促进作用和参考价值。
[Abstract]:Natural gas is an increasingly important energy in the world. With the deepening of the oil crisis, natural gas as a relatively clean and rich energy, its development is accelerating, and new research results have been emerging. At this stage, the main research content has two aspects: on the one hand, the research on low temperature heat exchanger, so that the basic industry can always adapt to the technical level of development requirements; On the other hand, the cold energy utilization of LNG is studied. The cooling capacity of LNG is very large and its grade is very high. The full utilization of LNG is not only the requirement of energy saving, but also a chance to combine all kinds of industries. Natural gas research in China is still in its infancy, although the prospect is very broad, but there are still many problems to be solved, especially in basic research there is a great gap to be filled. In this paper, the low temperature LNG heat exchanger and the LNG heat exchanger network are studied. The main contents are as follows: (1) the structure of the tube wound heat exchanger is deeply understood, and the general situation of its application at home and abroad is also investigated. The whole design calculation method is expounded. (2) A simple calculation method for calculating heat transfer area is put forward and compared with a practical application. The conclusion shows that the calculation method is within the scope of engineering. It is more applicable under appropriate conditions. (3) explain the basic concept of heat transfer network and list several main design methods. Find out that the relatively accurate method is pinch analysis. (4) the cold energy of LNG ships is designed and calculated by using heat transfer network, and two possible heat transfer networks are compared, and the relative optimal results are finally selected. The relationship between the pinch temperature and the total cost is discussed, and the conclusion is drawn that the lower the pinch temperature is, the less the investment is. The calculation method of heat exchanger area presented in this paper and the analysis of the advantages and disadvantages of the heat exchanger network are helpful for the study of the design and optimization of the heat exchanger network.
【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】：TK172
本文编号：2276818
[Abstract]:Natural gas is an increasingly important energy in the world. With the deepening of the oil crisis, natural gas as a relatively clean and rich energy, its development is accelerating, and new research results have been emerging. At this stage, the main research content has two aspects: on the one hand, the research on low temperature heat exchanger, so that the basic industry can always adapt to the technical level of development requirements; On the other hand, the cold energy utilization of LNG is studied. The cooling capacity of LNG is very large and its grade is very high. The full utilization of LNG is not only the requirement of energy saving, but also a chance to combine all kinds of industries. Natural gas research in China is still in its infancy, although the prospect is very broad, but there are still many problems to be solved, especially in basic research there is a great gap to be filled. In this paper, the low temperature LNG heat exchanger and the LNG heat exchanger network are studied. The main contents are as follows: (1) the structure of the tube wound heat exchanger is deeply understood, and the general situation of its application at home and abroad is also investigated. The whole design calculation method is expounded. (2) A simple calculation method for calculating heat transfer area is put forward and compared with a practical application. The conclusion shows that the calculation method is within the scope of engineering. It is more applicable under appropriate conditions. (3) explain the basic concept of heat transfer network and list several main design methods. Find out that the relatively accurate method is pinch analysis. (4) the cold energy of LNG ships is designed and calculated by using heat transfer network, and two possible heat transfer networks are compared, and the relative optimal results are finally selected. The relationship between the pinch temperature and the total cost is discussed, and the conclusion is drawn that the lower the pinch temperature is, the less the investment is. The calculation method of heat exchanger area presented in this paper and the analysis of the advantages and disadvantages of the heat exchanger network are helpful for the study of the design and optimization of the heat exchanger network.
【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】：TK172
【参考文献】
相关期刊论文 前10条
1 吴金星;李亚飞;张灿灿;王力;许克;;绕管式换热器的结构形式分析及应用前景[J];压力容器;2014年02期
2 陈永东;陈学东;;我国大型换热器的技术进展[J];机械工程学报;2013年10期
3 浦晖;陈杰;;绕管式换热器在大型天然气液化装置中的应用及国产化技术分析[J];制冷技术;2011年03期
4 贾金才;;几何参数对绕管式换热器传热特性影响的数值研究[J];流体机械;2011年08期
5 顾安忠;;迎向“十二五”中国LNG的新发展[J];天然气工业;2011年06期
6 王艳;;低碳经济下的液化天然气船舶市场[J];中国航海;2010年03期
7 朱玉琴;周丹黎;;利用夹点技术分析优化换热网络[J];西安石油大学学报(自然科学版);2008年06期
8 余黎明;江克忠;张磊;;我国液化天然气冷能利用技术综述[J];化学工业;2008年03期
9 王艳;;世界液化天然气船舶市场研究分析[J];中国航海;2007年02期
10 徐文东;高丽荣;华贲;王小伍;;液化天然气冷能梯级集成利用技术研究[J];现代化工;2007年04期
相关硕士学位论文 前4条
1 罗惠芳;液化天然气冷能利用的研究[D];华中科技大学;2011年
2 王竹筠;液化天然气（LNG）冷能回收及应用研究[D];大庆石油学院;2010年
3 位雅莉;天然气液化工艺模拟与分析[D];西南石油学院;2004年
4 安彭军;天然气液化流程模拟与优化的研究[D];兰州理工大学;2003年
，本文编号：2276818
本文链接：https://www.wllwen.com/kejilunwen/dongligc/2276818.html
