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1. 发明申请

US20140283548A1 SYSTEM AND METHOD FOR LIQUEFYING NATURAL GAS USING SINGLE MIXED REFRIGERANT AS REFRIGERATION MEDIUM 审中-公开
标题翻译：使用单一混合制冷剂作为制冷剂液化天然气的系统和方法
公开(公告)号：US20140283548A1
公开(公告)日：2014-09-25
申请号：US14354964
申请日：2012-09-13
申请人： Zhenyong He , Long Yu , Sheng Zhang , Jianqing Fu , Xiaozhe Zhang
发明人： Zhenyong He , Long Yu , Sheng Zhang , Jianqing Fu , Xiaozhe Zhang
IPC分类号： F25J1/00
CPC分类号： F25J1/0022 , F25J1/0055 , F25J1/0212 , F25J1/0291 , F25J2220/64
摘要： 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.
摘要翻译：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。

2. 发明申请

US20150013378A1 Apparatus And Method For Liquefying Natural Gas By Refrigerating Single Mixed Working Medium 审中-公开
标题翻译：通过制冷单一混合工作介质液化天然气的装置和方法
公开(公告)号：US20150013378A1
公开(公告)日：2015-01-15
申请号：US14381675
申请日：2012-09-13
申请人： Zhenyong He , Guiqi Wang , Limei Liu
发明人： Zhenyong He , Guiqi Wang , Limei Liu
IPC分类号： F25J1/00
CPC分类号： F25J1/0022 , F25J1/0055 , F25J1/0212 , F25J1/0291 , F25J2220/64
摘要： 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), coolers (21, 22), gas-liquid separators (31, 32), throttling devices (51, 52), a plate-fin heat exchanger group (8) and a LNG storage tank (9). The method of the present invention reduces the power consumption for gas compression by compressing and separating the mixed refrigerant stage by stage. The heat exchange curves of cold fluid and hot fluid in the total heat exchange process match with each other better by the aid of using multiple-stage heat exchange, which can reduce the flow of the mixed refrigerant. Further, the system of the present invention has a good adaptability to load-variable operation of the apparatus, and thus can effectively avoid abnormal liquid-flooding at the bottom of the cold box.
摘要翻译：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。该系统包括两级混合制冷剂压缩机（1），冷却器（21,22），气液分离器（31,32），节流装置（51,52），板翅式热交换器组（8）和 LNG储罐（9）。本发明的方法通过逐级压缩和分离混合制冷剂来降低气体压缩的功率消耗。冷热流体和热流体在总热交换过程中的热交换曲线通过使用多级热交换更好地相互匹配，这可以减少混合制冷剂的流量。此外，本发明的系统对装置的可变负载运行具有良好的适应性，因此能够有效地避免冷箱底部的异常液体驱油。

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