天然气是一种优质、洁净的能源,因其热值高、燃烧产物对环境污染少,被认为是二十一世纪的首选能源。小型天然气液化装置是国际上研究的一个热点。本文从小型液化流程装置的要求出发,提出小型天然气膨胀液化流程,并以液化单位千摩尔天然气的比功耗为系统性能评价指标,对影响比功耗的主要参数进行分析优化,为流程参数的选择提供理论指导。 Natural gas is a kind of high-quality and clean energy. Because of its high calorific value, the combustion products have little environmental pollution and are considered as the preferred energy source in the 21st century. Small natural gas liquefaction plant is a hot spot in the international research. Based on the requirement of small liquefaction process, this paper proposes a process of expansion and liquefaction of small natural gas, and uses the specific power of liquefied natural gas per thousand moles as the evaluation index of system performance. The main parameters influencing specific power consumption are analyzed and optimized, Choose to provide theoretical guidance.