天然气液化装置工艺设计【毕业设计】.doc

PAGE IV PAGE III 摘要 天然气是一种优质、清洁的能源、高热值,燃烧产物对环境污染少,被认为是21世纪的首选能源。 本文简要介绍了液化天然气的全过程,本文介绍了现有的几种天然气液化技术和过程。通过各种常见的气体液化工艺特性进行了分析,并提出了液化天然气流量循环的选择原则的过程。然后讲述了天然气预处理方法,并结合的条件选择适当的预处理方案。在混合制冷剂液化丙烷预冷过程中,混合制冷剂液化循环已经很成熟,这过程中液化天然气(LNG)工厂已经得到了广泛的应用。在丙烷预冷混合制冷剂液体循环技术的基础上,从热力学的角度,根据天然气和混合制冷剂热物理参数的特点,选用PR方程计算平衡混合利用计算机仿真技术和液化天然气藏的形成与分布特点,然后过程仿真。根据模拟的数据进行计算，得到结果，然后根据结果选择合适的设备。设备选完后，按照要求布置厂房。 关键词：天然气液化，丙烷预冷，混合制冷剂，流程模拟，状态方程 Abstract Natural gas is a high-quality, clean energy, high calorific value, combustion products on the environmental pollution, less is believed to be the first choice of 21 century energy. This paper briefly introduces the whole process of liquefied natural gas (LNG), this paper introduces some existing LNG technology and process. Through all kinds of common gas liquefaction process characteristics are analyzed, and put forward the liquefied natural gas flow circulation principle of selection of the process. And then tells the story of natural gas, and combining the pretreatment method of selecting the appropriate conditions the pretreatment of the scheme. In the mixed refrigerants liquefaction propane precooling process, mixed refrigerants liquefaction cycle has already very mature, the process liquefied natural gas (LNG) plant has been widely used. In the propane precooling mixed refrigerant liquid circulation technology, on the basis of the theory, according to the laws of thermodynamics from natural gas and mixed refrigerants hot physical parameters characteristics, use of PR equation computation balance mixed using computer simulation technology and LNG (liquefied natural gas) formation and distribution characteristics of the Tibetan, then process simulation. Based on the simulation data calculation, get the result, and then choose the appropriate equipment according to the results. Equipment choose finished, according to the request and decorate workshop. Keywords：Liquefied natural gas(LNG), Propane precooling, Mixed refrigerant ,Process simulation,PR equati