摘要:
A method and apparatus of removing heavy hydrocarbons from a natural gas feed stream, the method comprising using first and second hydrocarbon removal systems in series such that the first system processes the natural gas feed stream to produce a heavy hydrocarbon depleted natural gas stream and the second system processes at least a portion of the heavy hydrocarbon depleted natural gas stream from the first system to produce a natural gas stream lean in heavy hydrocarbons, wherein one of said systems is a adsorption system that comprises one or more beds of adsorbent for adsorbing and thereby removing heavy hydrocarbons from a heavy hydrocarbon containing natural gas, and the other of said systems is a gas-liquid separation system for separating a heavy hydrocarbon containing natural gas into a heavy hydrocarbon depleted natural gas vapor and a heavy hydrocarbon enriched liquid.
摘要:
Method and apparatus cooling a hydrocarbon stream such as natural gas. An initial hydrocarbon stream (8) is passed through a first separator (16) to provide an initial overhead stream (110) and a mixed hydrocarbon feed stream (10). The initial overhead stream (110) is cooled to provide a cooled hydrocarbon stream (120) such as LNG, and at least a Cl overhead stream (20) and one or more C2, C3 and C4 overhead streams (40, 50, 60) are separated from the mixed hydrocarbon feed stream. At least a fraction (45, 55, 65) of at least one of the group comprising: the C2 overhead stream (40), the C3 overhead stream (50) and the C4 overhead stream (60); is cooled with the C1 overhead stream (20) to provide a cooled stream (70), which is further cooled against at least a fraction of the cooled, preferably liquefied, hydrocarbon stream (120) to provide an at least partly liquefied cooled stream (71).
摘要:
NGL recovery from natural gas is achieved by processing the natural gas in a scrub column that operates at high pressure. A C3+ depleted vapor stream is generated from the vapor portion of partially condensed scrub column overhead and expanded to provide refrigeration for the vapor portion to so form a second reflux stream and the C3+ depleted vapor stream. The C3+ depleted vapor stream is then combined with another vapor portion of partially condensed column overhead to produce a lean liquefaction feed stream.
摘要:
Contemplated plants for flexible ethane recovery and rejection by allowing to switch the top reflux to the demethanizer from residue gas to the deethanizer overhead product and by controlling the flow ratio of feed gas to two different feed gas exchangers. Moreover, the pressure of the demethanizer is adjusted relative to the deethanizer pressure for control of the ethane recovery and rejection.
摘要:
A process and apparatus for liquefying a gas stream comprising hydrocarbons and sour species is provided in which the sour species are removed in liquefied form as the sweetened gas stream is progressively cooled to liquefaction temperatures. The process involves cooling the gas stream in a manner to produce a cooled gas stream comprising gaseous hydrocarbons and residual sour species. The cooled gas stream is then treated with a cold solvent to deplete the cooled gas stream of residual sour species. The resulting cooled sweetened gas stream is then further cooled to produce liquid hydrocarbons.
摘要:
A process (10) for producing hydrocarbons from natural gas includes, in a cryogenic separation stage (16), cryogenically separating the natural gas to produce at least a methane stream and natural gas liquids, in a reforming stage (20), reforming the methane stream to produce a synthesis gas which includes at least CO and H2, and in a Fischer-Tropsch hydrocarbon synthesis stage (22), converting at least some of the CO and H2 into a Fischer-Tropsch product which includes hydrocarbons. A Fischer- Tropsch tail gas which includes at least CO and H2, methane and heavier than methane hydrocarbons, is separated from the Fischer-Tropsch product in a Fischer-Tropsch product separation stage (24). At least a portion of the Fischer-Tropsch tail gas is recycled to the cryogenic separation stage (16), where the Fischer-Tropsch tail gas is cryogenically separated into two or more streams.
摘要:
A process for the sequestration of carbon dioxide, the process comprising injecting a carbon dioxide containing stream into a reservoir, wherein the carbon dioxide containing stream has been obtained from a gaseous mixture by cryogenic separation. A further aspect of the invention discloses a process for enhanced oil recovery, the process comprising injecting a gaseous mixture comprising carbon dioxide into a subsurface reservoir to enhance the recovery of hydrocarbons from the reservoir, wherein the carbon dioxide content in the gaseous mixture has been enriched by cryogenic separation. Typically a carbon dioxide depleted stream is also produced and used as a fuel gas, particularly for a gas to liquids plant.
摘要:
A process for condensing a C 3 -C 4 hydrocarbon vapor which comprises contacting the C 3 -C 4 hydrocarbon vapor with a heat exchanger surface which is cooled by contact with LNG and recovering a liquefied C 3 -C 4 product therefrom.
摘要:
Method and apparatus producing a LNG stream, wherein before liquefaction heavier hydrocarbon components are removed from a NG stream to be liquefied, the method at least comprising the steps of: providing a vaporous feed stream (1) of natural gas; feeding the feed stream (1) into a distillation column (10); drawing a bottom stream (17) and an overhead stream (16) from the distillation column (10); and liquefying at least a part of the overhead stream (16) thereby obtaining a LNG stream; wherein the step of feeding the feed stream (1) into the distillation column (10) comprises the sub steps of: splitting the feed stream (1) into first (3a) and second (3b) substreams; feeding the first substream (3a) into the distillation column (10) via a first feed point (7a), at a pressure not lower than the feed stream pressure minus a pressure drop brought about by the said splitting of the feed stream (1); cooling the second substream (3b); and feeding the cooled second substream (7) into the distillation column (10) at a second feed point (7b) overhead of the first feed point (7a).
摘要:
A process for treating a crude containing natural gas comprising supplying the crude to a stabilization unit (3) to obtain a gaseous stream and crude oil; supplying a compressed, gaseous stream at a low temperature to the bottom of a first column (47); partly condensing (53) the first gaseous overhead stream, returning (58) the liquid phase to the first column (47) and supplying (14) the methane-rich stream to a liquefaction plant; supplying an expanded bottom stream (60) at a low temperature to the top of a second column (65); removing from the top of the second column (65) a second gaseous overhead stream (67), and removing from the bottom of the second column (65) a liquid bottom stream; vaporizing (73) part of the bottom stream (69) and introducing the vapour into the bottom of the second column (65); and introducing the remainder of the bottom stream (75) into a crude oil stream at an appropriate point in or upstream of the stabilization unit (3), wherein the amount of heat removed from the first gaseous overhead stream is so adjusted that the concentration of C 5 + in the first gaseous overhead stream is below a predetermined value, and wherein the fraction of the liquid bottom stream from the second column (65) that is vaporized is so selected that the concentration of C 2 -in the liquid bottom stream is below a predetermined level.