US 11,892,235 B2
Method and system for processing natural gas
Willard Brent Mealey, Calgary (CA); and Anthony Hok Shing Wu, Calgary (CA)
Assigned to CEMM CANADA LIMITED, Calcary (CA)
Filed by CEMM Canada Limited, Calgary (CA)
Filed on Nov. 9, 2021, as Appl. No. 17/522,339.
Claims priority of provisional application 63/112,869, filed on Nov. 12, 2020.
Prior Publication US 2022/0146194 A1, May 12, 2022
Int. Cl. F25J 3/02 (2006.01)
CPC F25J 3/0209 (2013.01) [F25J 3/0238 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A system for processing natural gas, the system comprising:
a first compressor for compressing the natural gas into a compressed gas;
a cooling unit for cooling the compressed gas;
a three-way valve downstream of the cooling unit;
an ethylene glycol regeneration unit for injecting ethylene glycol into the cooling unit;
a low-temperature gas-liquid phase separator for: separating the cooled compressed gas into a separator gas, a hydrocarbon liquid and a liquid water/ethylene glycol; directing the separator gas to the cooling unit before filtering and discharge to a natural gas product line as a natural gas product or after compression in a second compressor to a compressed natural gas line as a compressed natural gas product; directing the hydrocarbon liquid to at least one condenser for heating to form a heated hydrocarbon liquid; and directing the liquid water/ethylene glycol to the ethylene glycol regeneration unit;
a deethanizer comprising a top section and a bottom section; the top section configured to separate the heated hydrocarbon liquid into a top section gas and a top section liquid, the top section liquid sent to the bottom section; and the bottom section configured to separate the top section liquid into a bottom section gas and a bottom section liquid, the bottom section gas sent to the top section and the bottom section liquid sent to a natural gas liquids cooler, resulting in a natural gas liquids product for discharge to a natural gas liquids line;
the top section gas sent to the at least one condenser for cooling and condensing into a condenser liquid, the condenser liquid sent to an accumulator with an operating pressure maintained by an accumulator gas control valve, the accumulator separating the condenser liquid into an accumulator gas and an accumulator liquid; and
the accumulator liquid sent to the top section, and the accumulator gas sent to the at least one condenser before being sent to the cooling unit before passing through the three-way valve to selectively direct the accumulator gas to either the natural gas product line for mixing with the natural gas product or to the compressor.