公开(公告)号：US20140116084A1

公开(公告)日：2014-05-01

申请号：US14126735

申请日：2012-06-22

Applicant: SAIPEM S.A.

Inventor： Marc Bonnissel ,  Bertrand Du Parc ,  Eric Zielinski

IPC: F25J1/00

CPC classification number: F25J1/0022 ,  C09K5/041 ,  C09K5/042 ,  C09K2205/13 ,  C09K2205/132 ,  F25B9/06 ,  F25J1/005 ,  F25J1/0072 ,  F25J1/0097 ,  F25J1/0204 ,  F25J1/0212 ,  F25J1/0254 ,  F25J1/0283 ,  F25J1/0287 ,  F25J1/0288 ,  F25J2270/16

Abstract: A method for liquefying a natural gas primarily including methane, preferably at least 85% of methane, the other components essentially including nitrogen and C2-C4 alkanes, in which the natural gas to be liquefied is liquefied by circulating at a pressure P0 no lower than the atmospheric pressure (Patm), P0 preferably being higher than the atmospheric pressure, in at least one cryogenic heat-exchanger (EC1, EC2, EC3) by a counter-current closed-circuit circulation in indirect contact with at least one stream of coolant gas remaining in the compressed gaseous state at a pressure P1 that is entering the cryogenic heat-exchanger at a temperature T3′ that is lower than T3, T3 being the liquefaction temperature of the liquefied natural gas at the pressure P0 at the output of said cryogenic exchanger, characterised in that the coolant gas includes a mixture of nitrogen and at least one other component selected from among neon and hydrogen.

Abstract translation: 液化天然气的方法，主要包括甲烷，优选至少85％的甲烷，其他组分基本上包括氮和C 2 -C 4烷烃，其中待液化的天然气通过以不低于 在至少一个低温热交换器（EC1，EC2，EC3）中，通过与至少一个冷却剂流间接接触的逆流闭路循环，大气压力（Patm），P0优选高于大气压力 气体以处于低于T3的温度T3'进入低温热交换器的压力P1保持在压缩气态，T3是液化天然气在所述低温输出处的压力P0下的液化温度 交换器，其特征在于，所述冷却剂气体包括氮和选自氖和氢中的至少一种其它组分的混合物。