Abstract:
A method of cooling at least two hydrocarbon streams such as natural gas, the method at least comprising the steps of : (a) providing at least first and second hydrocarbon streams (20, 20a); (b) passing the first hydrocarbon strea (20) through one or more first heat exchangers (12, 14) to provide a first cooled hydrocarbon stream (30); and (c) passing the second hydrocarbon stream (20a) through one or more second heat exchangers (12a, 14a) to provide a second cooled hydrocarbon stream (30a); wherein a refrigerant circuit (100) provides cooling to the first heat exchanger (s) (12, 14) and the second heat exchanger (s) (12a, 14a).
Abstract:
The present invention relates to a plant (10) for liquefying natural gas (90) , the plant (10) at least comprising: - a pre-cooling heat exchanger train (1) comprising a final heat exchanger (2a) for cooling the natural gas stream (90); - a distributor (4) located upstream of the final heat exchanger for splitting the natural gas stream (90) into at least first and second natural gas substreams; - at least first and second main cryogenic systems (200,200') , each system (200,200') comprising an outlet for liquefied natural gas (95,95').
Abstract:
Natural gas liquification systems (110) are provided wherein dependent trains (C) and (D) incuding only cryogenic heat exchanger systems (11) are serviced by common components (112), (113), (114), and (117) in the system (110) such that individual components need not be included in each dependent train (C) and (D) for servicing that function. Further, the common components (112), (113), (114), and (117) are positioned near the LNG storage tanks (120) which, in turn, are typically located a substantial distance from the trains (C) and (D). This significantly reduces capital costs and allows boil-off gas from LNG storage tanks (120) to be used for cooling in ddition to being used as a fuel gas.
Abstract:
A system and method for producing liquefied natural gas (LNG) from a natural gas stream. Each of a plurality of LNG trains liquefies a portion of the natural gas stream to generate a warm LNG stream in a first operating mode, and a cold LNG stream in a second operating mode. A sub-cooling unit is configured to, in the first operating mode, sub-cool the warm LNG stream to thereby generate a combined cold LNG stream. The warm LNG stream has a higher temperature than a temperature of the cold LNG stream and the combined cold LNG stream. The combined cold LNG stream has, in the first operating mode, a higher flow rate than a flow rate of the cold LNG stream in the second operating mode.
Abstract:
A plant and process are used to liquefy and purify a high pressure ethane feed stream. The plant includes a cascaded refrigeration system that refrigerates the ethane feed stream. The refrigeration system includes a propylene circuit, an ethylene circuit and a mixed refrigerant circuit. The mixed refrigerant circuit includes a refrigerant that includes ethane and methane. The plant includes a demethanizer that is configured to remove methane and other natural gas liquids from the refrigerated ethane stream.
Abstract:
A nitrogen stripper uses a shared distillation column that performs cryogenic distillation of multiple liquefied natural gas streams that are sourced from multiple cryogenic heat exchangers. The shared distillation column receives at least a part of an expanded liquefied natural gas stream, and discharges a liquefied natural gas stream through a bottom liquid outlet, and a reject vapour through an overhead vapour outlet. The expanded liquefied natural gas stream is obtained by expanding a plurality of pressurized liquefied natural gas streams discharged by the cryogenic heat exchangers. The distillation column is connected to a reboiler system, which has a separate heat exchange core for each one of the multiple liquefied natural gas streams that is dedicated to only one of these liquefied natural gas streams.
Abstract:
A method of cooling a hydrocarbon stream such as natural gas, the method at least comprising the steps of: (a) providing a feed stream (10); (b) passing the feed stream (10) through a gas treatment stage (2) comprising one or more (number: X) parallel gas treatment units (14a, 14b), the feed stream (10) being divided into two or more part-feed streams (20a, 20b) if there is more than one gas treatment unit, to provide one or more first treated streams (30a, 30b); (c) passing the first treated stream or streams (30a, 30b) of step (b) through an NGL extraction stage (4) comprising one or more (number: Y) parallel NGL extraction units (16a, 16b), the first treated stream or streams (30a, 30b) being shared to match the number of NGL extraction units (16a, 16b), to provide one or more second treated streams (40a, 40b); and (d) passing the second treated stream or streams (40a, 40b) of step (c) through a cooling stage (6) comprising one or more (number: Z) parallel cooling systems (22), the second treated stream or streams (40a, 40b) being shared to match the number of cooling systems (22), to provide a cooled hydrocarbon stream or streams.
Abstract:
It refers to a method of production ofliquefied natural gas (LNG) which comprises the use of air as refrigerant in an open or closed cycle. The invention also refers to a systemto carry out said process.
Abstract:
A method of cooling a hydrocarbon stream such as natural gas, the method at least comprising the steps of: (a) providing a feed stream (10); (b) passing the feed stream (10) through a gas treatment stage (2) comprising one or more (number: X) parallel gas treatment units (14a, 14b), the feed stream (10) being divided into two or more part-feed streams (20a, 20b) if there is more than one gas treatment unit, to provide one or more first treated streams (30a, 30b); (c) passing the first treated stream or streams (30a, 30b) of step (b) through an NGL extraction stage (4) comprising one or more (number: Y) parallel NGL extraction units (16a, 16b), the first treated stream or streams (30a, 30b) being shared to match the number of NGL extraction units (16a, 16b), to provide one or more second treated streams (40a, 40b); and (d) passing the second treated stream or streams (40a, 40b) of step (c) through a cooling stage (6) comprising one or more (number: Z) parallel cooling systems (22), the second treated stream or streams (40a, 40b) being shared to match the number of cooling systems (22), to provide a cooled hydrocarbon stream or streams.
Abstract:
Plant and method for liquefying natural gas. The plant comprises a pre-cooling heat exchanger train (1) having an inlet (13) for natural gas and an outlet (14) for pre-cooled natural gas, a distributor (4) having an inlet (18) connected to the outlet (14) for pre-cooled natural gas and having two distributor outlets (22,23). The plant further comprises two natural gas liquids extraction units having an extraction unit inlet, a heavy fraction outlet and an overhead light fraction outlet, and two main heat exchangers (5,5') to cool the overhead light fraction from its corresponding natural gas liquids extraction unit to liquefaction.