公开(公告)号：US20140283548A1

公开(公告)日：2014-09-25

申请号：US14354964

申请日：2012-09-13

Applicant: Zhenyong He ,  Long Yu ,  Sheng Zhang ,  Jianqing Fu ,  Xiaozhe Zhang

Inventor： Zhenyong He ,  Long Yu ,  Sheng Zhang ,  Jianqing Fu ,  Xiaozhe Zhang

IPC: F25J1/00

CPC classification number: F25J1/0022 ,  F25J1/0055 ,  F25J1/0212 ,  F25J1/0291 ,  F25J2220/64

Abstract: A system and a method for liquefying natural gas using single mixed refrigerant as refrigeration medium are provided. The system comprises a two-stage mixed refrigerant compressor (1) driven by a motor, two coolers (21, 22), a liquid pump (4), three gas-liquid separators (31, 32, and 6), two throttling devices (51, 52), a plate-fin heat exchanger group (7) and a LNG storage tank (8). The method comprises the following steps: the mixed refrigerant is compressed step by step by using the two-stage mixed refrigerant compressor (1), separated step by step, and gas-phase and liquid phase mixed refrigerant streams obtained from the separation flow into different passages of the heat exchanger group (7) respectively for throttling and heat exchanging. Heat exchange curves of cold fluid and hot fluid in the whole heat exchange process match with each other better by using two-stage heat exchange, thereby flow of the mixed refrigerant is reduced effectively.

Abstract translation: 提供了使用单一混合制冷剂作为制冷介质液化天然气的系统和方法。 该系统包括由电动机驱动的两级混合制冷剂压缩机（1），两个冷却器（21,22），液体泵（4），三个气液分离器（31,32和6），两个节流装置 （51,52），板翅式热交换器组（7）和LNG储罐（8）。 该方法包括以下步骤：使用两级混合制冷剂压缩机（1）逐步压缩混合制冷剂，将从分离流获得的气相和液相混合制冷剂流分离成不同的 热交换器组（7）的通道分别用于节流和热交换。 整个热交换过程中的冷流体和热流体的热交换曲线通过两级热交换更好地相互匹配，从而有效地降低混合制冷剂的流动。