天然气净化液化装置的设计与分析

Design and Analysis of Natural Gas Purification Liquefaction Plant

天然气净化液化装置采用二甘醇胺脱酸、分子筛脱水天然气净化技术和氮气二级膨胀制冷工艺。氮气二级膨胀制冷工艺的制冷剂总是处于气相,换热器在相当宽的温差范围内操作,能承受进料气的组成变化。采用燃气发电机作为工厂电源并利用燃气发电机的尾气作为DGA复活和分子筛再生气的热源。本装置的成功投运为我国在边远油气田利用天然气生产LNG提供了经验。

The natural gas purification liquefaction plant adopts diethylene glycol amine deacidification, molecu- lar sieve dehydration natural gas purification technology and nitrogen two - stage expansion refrigeration technology. The refrigerant of nitrogen dioxide two - stage expansion refrigeration process is always in the gas phase, and the heat exchanger operates within a wide range of temperature difference, and can withstand the change of the composition of the feed gas. The gas generator is used as the power somme of the plant and the tail gas of the gas generator is used as the heat somme of the DGA and the molecular sieve. The successful operation of this device provides experience for China to use natural gas to produce LNG in lemote oil and gas fields.