摘要:
A method for the liquefaction of an industrial gas by integration of a methanol plant and an air separation unit (ASU) is provided. The method can include the steps of: (a) providing a pressurized natural gas stream (24, 27), a pressurized purge gas stream (48) originating from a methanol plant, and a pressurized air gas stream (132) comprising an air gas originating from the ASU; (b) expanding three different pressurized gases to produce three cooled streams (32, 62, 142), wherein the three different pressurized gases are the pressurized natural gas stream, the pressurized purge gas stream, and the pressurized air gas stream; and (c) liquefying the industrial gas (44) in a liquefaction unit against the three cooled streams to produce a liquefied industrial gas stream (46). The industrial gas to be liquefied is selected from the group consisting of a first portion of the pressurized natural gas stream, a nitrogen gas stream, hydrogen and combinations thereof.
摘要:
A method and apparatus for the production of air gases by the cryogenic separation of air can include the steps of sending a purified and compressed air stream to a cold box under conditions effective for cryogenically separating the air stream into oxygen and nitrogen using a system of columns, wherein the purified and compressed air stream is at a feed pressure when entering the system of columns; withdrawing the oxygen at a product pressure; delivering the oxygen at a delivery pressure to an oxygen pipeline, wherein the oxygen pipeline has a pipeline pressure; and monitoring the pipeline pressure. The method can also include a controller configured to determine whether to operate in a power savings mode or a variable liquid production mode. By operating the method in a dynamic fashion, a power savings and/or additional high value cryogenic liquids can be realized in instances in which the pipeline pressure deviates from its highest value.
摘要:
A method for LNG production, where natural gas is pre-treated in a pre-treatment unit to give a pre-treated gas stream mainly comprising methane, and where compounds potentially solidifying in the liquefaction process are reduced to a level lower than 50 ppm, where the pre-treated gas stream is compressed to a pressure of 100 - 300 bara, where the pre-treated and compressed gas is transferred in a subsea pipeline to a remote floating LNG liquefaction unit, where the gas transferred to the floating LNG liquefaction unit is expanded to a pressure of 40 to 100 bara, and then introduced into a LNG heat exchanger and cooled against a coolant to produce Liquefied Natural Gas (LNG), wherein the gas stream is split in two streams after being expanded and before being introduced into the LNG heat exchanger to give a first split gas stream that is introduced into the LNG heat exchanger, and a second split gas stream that is heated by heat exchanging against the incoming pressurized gas stream for cooling thereof, where the heated second gas stream is transferred to the pre-treatment unit for re-circulation to the remote floating LNG liquefaction unit, and a system using the method, are described.
摘要:
The present invention provides a method of natural gas, the method at least comprising the steps of: (a) providing a natural gas stream (10) at a first location (2); (b) treating the natural gas stream (10) in the first location (2) thereby obtaining a treated natural gas stream (20), wherein the treated natural gas stream comprises in the range of from 70 to 100 mole% of methane; (c) transporting the treated natural gas stream (20) via a pipeline (4) over a distance of at least 2 km to a second location (3); (d) liquefying the treated natural gas stream (20) at the second location (3) thereby obtaining liquefied hydrocarbon product (50) at atmospheric pressure.
摘要:
A method includes, controlling a first process using a first process control system. The method also includes controlling a second process using a second process control system. The method further includes controlling the first and second process control systems together. In addition, the method includes optimizing at. least one process objective using both the first and second process control systems. The first process can be a natural gas liquids production process, and the second process can be a liquefied natural gas production process. The process objective could include at least one of : profit, natural gas liquids quantity, natural gas liquids quality, liquefied natural gas quantity, and liquefied natural gas quality.
摘要:
A fixed LNG production facility is described. The LNG production facility is positioned in a body of water at a production location, the facility comprising a plurality of spaced-apart modules, each module provided with plant equipment related to a pre-determined function associated with the production of LNG, and wherein at least one of the spaced-apart modules is arranged to provide a breakwater for at least one other module.
摘要:
A method of controlling liquid and gaseous production within a plurality of air separation plants (10, 12) to produce and distribute gaseous and liquid products to a plurality of customers (20, 22, 24) in which the electrical power costs involved in producing gaseous and liquid products is optimized to be at a minimum together with road shipping costs of liquid products by a real time optimization program (84).
摘要:
A method of controlling liquid and gaseous production within a plurality of air separation plants (10, 12) to produce and distribute gaseous and liquid products to a plurality of customers (20, 22, 24) in which the electrical power costs involved in producing gaseous and liquid products is optimized to be at a minimum together with road shipping costs of liquid products by a real time optimization program (84).
摘要:
A method for production of liquefied natural gas (LNG) from a natural gas source, the method comprising introduction of the natural gas into a gas terminal where the gas is pre-treated, where the pre-treated natural gas is led via subsea pipelines to floating liquid natural gas production units (FLNG) offshore, each comprising one or more LNG production unit(s) where the natural gas is liquefied to give LNG and where the LNG is transferred to LNG tankers for transport to markets, wherein the pre-treatment of the gas before transfer to the FLNG comprises separation of liquefied Petroleum Gas (LPG) from the natural gas to give a LNG ready natural gas comprising > 85 % by volume methane, and