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1.发明申请公开(公告)号：US20130247610A1
公开(公告)日：2013-09-26
申请号：US13846238
申请日：2013-03-18
申请人： SHELL OIL COMPANY
IPC分类号： F25J1/00
CPC分类号： F25J1/0022 , F25J1/0052 , F25J1/0055 , F25J1/0212 , F25J1/0214 , F25J1/0238 , F25J1/029 , F25J1/0292 , F25J1/0294 , F25J5/002 , F25J2220/62 , F25J2220/64
摘要： A partially condensed hydrocarbon feed stream is sent to a column. An overhead vapour hydrocarbon stream from the column is then partially condensed by indirect heat exchanging against an expanded cooling fluid flowing through a first section of a cold side heat exchanging channel. The cooling fluid consists of a mixed refrigerant composition, and liquid from the expanded cooling fluid is continuously transformed to vapour thereby forming a residual liquid portion of not evaporated expanded cooling fluid. The residual liquid is used to progressively condense the hydrocarbon feed stream to produce the partially condensed hydrocarbon feed stream that is sent to the column, by allowing the hydrocarbon feed stream to lose heat to the residual liquid passing through a second section of the cold side heat exchanging channel. The liquid component that is condensed out of the overhead vapour hydrocarbon stream is used as reflux for the column.
摘要翻译： 将部分冷凝的烃进料流送入塔中。 然后通过与流过冷侧热交换通道的第一部分的膨胀的冷却流体进行间接热交换，将来自塔的顶部蒸汽烃流部分冷凝。 冷却流体由混合的制冷剂组合物组成，来自膨胀的冷却流体的液体被连续转化为蒸气，从而形成未蒸发的膨胀冷却流体的残留液体部分。 残余液体用于逐渐冷凝烃进料流，以产生被送至塔的部分冷凝的烃进料流，通过使烃进料流对通过冷侧热的第二部分的残留液体失去热量 交换频道 从顶部蒸气烃流中冷凝的液体组分用作塔的回流。
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公开(公告)号：US20180356149A1
公开(公告)日：2018-12-13
申请号：US15781490
申请日：2016-12-06
申请人： SHELL OIL COMPANY
CPC分类号： F25J1/0022 , F25J1/0052 , F25J1/0055 , F25J1/0212 , F25J1/0214 , F25J1/0216 , F25J1/0252 , F25J1/0284 , F25J1/0292
摘要： The present invention relates to a method of controlling the production of a liquefied natural gas product stream (31) obtained by removing heat from natural gas by indirect heat exchange with an expanded heavy mixed refrigerant and an expanded light mixed refrigerant. The method comprises executing a control loop comprising maintaining the flow rate of the liquefied natural gas product stream (31) at a dependent set point and maintaining the flow rates of the heavy mixed refrigerant (60a) and the light mixed refrigerant (65) at operator manipulated set points (80, 81). The method further comprises executing an override control loop comprising: determining an override set point (95′) for the flow rate of the liquefied natural gas and computing an override set point (80′) for the flow rate of the heavy mixed refrigerant and an override set point (81′) to reduce residual available power of the electric motor.
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