Producing lng from methane containing synthetic gas
AssigneeHoneywell Lng LLC
InventorsMark Julian Roberts, Fei Chen, Russell B. Shnitser
Life of this patent
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Abstract
Described herein are methods and systems for producing liquefied natural gas (LNG) from a methane-containing synthetic gas (MCSG). An MCSG feed stream may be cooled and partially liquefied using one or more heat exchanger units. A first phase separator and a second phase separator in downstream fluid flow communication with the first phase separator may be used to separate the partially liquefied MCSG stream into a first residue gas stream and first and second feed streams, the first and second feed streams then being fed into a distillation column to produce an LNG stream and a second residue gas stream.
Claims24
A method for producing liquefied natural gas (LNG) from methane-containing synthetic gas (MCSG), the method comprising:
- (a) cooling and partially liquefying a MCSG feed stream to produce a partially liquefied MCSG feed stream;
- (b) using a first phase separator and a second phase separator arranged in series, with the second phase separator being in downstream fluid flow communication with the first phase separator, to separate the partially liquefied MCSG feed stream into at least three streams comprising a liquid stream and two vapor streams, the liquid stream forming a first feed stream, one of the vapor streams forming a second feed stream, and the other of the vapor streams forming a first residue gas stream;
- (c) introducing the first feed stream into a distillation column at a first location;
- (d) introducing the second feed stream into the distillation column at a second location that is above the first location, there being at least one separation stage between the first location and second location;
- (e) withdrawing an LNG stream from the distillation column formed of distillation column bottoms liquid;
- and
- (f) withdrawing a second residue gas stream from the distillation column formed of distillation column overhead vapor.
(canceled)
13-17. (canceled)
19-29. (canceled)
A method for producing liquefied natural gas (LNG) from methane containing synthetic gas (MCSG), the method comprising:
- (a) cooling and partially liquefying a MCSG feed stream to produce a partially liquefied MCSG feed stream by:
- (i) cooling a first refrigerant in a first heat exchanger unit or set of units to produce a cooled first refrigerant, wherein the first heat exchanger unit or set of units is a coil-wound heat exchanger unit or set of units;
- (ii) cooling and partially liquefying the MCSG feed stream in a second heat exchanger unit or set of units, via indirect heat exchange with one or more streams of the cooled first refrigerant and one or more process streams, to form the partially liquefied MCSG feed stream;
- (b) separating the partially liquefied MCSG feed stream into a LNG stream and one or more residue gas streams.
A system for producing liquefied natural gas (LNG) from methane containing synthetic gas (MCSG), the system comprising:
- one or more heat exchanger units for receiving, cooling and partially liquefying a MCSG feed stream to produce a partially liquefied MCSG feed stream;
- a first phase separator and a second phase separator in fluid flow communication with the one or more heat exchanger units and arranged in series, with the second phase separator being in downstream fluid flow communication with the first phase separator, for separating the partially liquefied MCSG feed stream into at least three streams comprising a liquid stream and two vapor streams, the liquid stream forming a first feed stream, one of the vapor streams forming a second feed stream, and the other of the vapor streams forming a first residue gas stream;
- and
- a distillation column having:
- a first inlet at a first location for receiving the first feed stream;
- a second inlet at second location for receiving the second feed stream, the second location being above the first location;
- at least one separation stage between the first location and second location;
- an outlet at the bottom of the distillation column for withdrawal of an LNG stream formed of distillation column bottoms liquid;
- and an outlet at the top of the distillation column for withdrawal of a second residue gas stream formed of distillation column overhead vapor.
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Dependencies are inferred from the claim text.