摘要:
This method comprises cooling the feed natural gas in a first heat exchanger and introducing the cooled, feed natural gas into a first separation flask.It comprises the dynamic expansion of a turbine supply flow in a first expansion turbine and introducing the expanded flow into a separation column. This method comprises removing, at the head of the separation column, a head flow rich in methane and removing a first recirculation flow from the compressed head flow rich in methane.The method comprises forming at least a second recirculation flow obtained from the head flow rich in methane downstream of the separation column and forming a dynamic expansion flow from the second recirculation flow.
摘要:
The method includes the introduction of a feed flow into a first flask, the dynamic; expansion of the gaseous flow issuing from the flask in a turbine, then its introduction into a first purification column. It comprises the production at the head of the first column of a purified gas and the recovery at the bottom of the first column of a liquefied bottom gas, which is introduced, after expansion, into a second column for elimination of the C5+ hydrocarbons. The purified head natural gas issuing from the first column is heated in a first heat exchanger by thermal exchange with a feed gas. The method includes the compression of the gaseous head flow of the second column in a compressor before its introduction into a second separator flask.
摘要:
This process includes the following steps: (a) the feed natural gas (101) is introduced into a first distillation column (31) which produces, as top product, a pretreated natural gas (111), which pretreated natural gas (111) no longer contains practically any C6+ hydrocarbons; (b) the pretreated natural gas (111) is introduced into an NGL recovery unit (19) comprising at least a second distillation column (49), so as to produce, on the one hand, as column top product, a purified natural gas (151) and, on the other hand, an NGL cut (15); and (c) the said liquefiable natural gas (161) is formed from the purified natural gas (151) resulting from step (b).
摘要:
This method comprises the cooling of the initial natural gas and its introduction into a column for recovering C2+ hydrocarbons. It comprises the recovery of the top stream from the column to form the treated natural gas, and the recovery of the bottom stream from the column for introducing it at a feed level of a fractionating column equipped with a top condenser. The column produces the said C3+ hydrocarbons at the bottom. The method comprises the recovery of the ethane rich stream from an intermediate level of the column located above the said feed level and the production of a secondary reflux stream from the said top condenser refluxed to the top of the recovery column.
摘要翻译:该方法包括冷却初始天然气并将其引入到用于回收C 2 O 3+烃的塔中。 其包括从塔中回收顶部流以形成经处理的天然气,并从塔中回收塔底物流,以将其引入配备顶部冷凝器的分馏塔的进料水平。 该柱在底部产生所述的C 3 O 3 + O 2 O 3。 该方法包括从位于所述进料水平以上的塔的中间水平回收富含乙烷的料流,以及从所述顶部冷凝器回流至回收塔的顶部的二次回流物流的产生。
摘要:
The invention relates to a method of separating a dry feed gas (1) containing mostly methane, ethane and propane into a first product (17), called the treated gas, which is relatively more volatile, and a second product (34), called fraction C2 plus, which is relatively less volatile. The inventive method comprises: (i) an operation involving the cooling of the supply gas (1) into a cooled gas (2); (ii) an operation whereby the cooled gas (2) from operation (i) is separated and treated; and (iii) distillation in a distillation device (C3). The invention also relates to the corresponding installation. According to the invention, the distillation device (C3) comprises at least first and second distillation columns, (C1) and (C2), which operate at different pressures.
摘要:
A process and apparatus for separation of a gas mixture. A process and an installation for cryogenic separation of the constituents of a natural gas under pressure in a first phase separator in which the constituents of each phase are separated in a distillation column. Part of the gaseous fraction from the top of the column is recycled into the highest stage of the column. The process also includes branching of part of a first top fraction from the first phase separator. The process also includes separation of a first bottom fraction from the first separator, in a second separator.
摘要:
This process includes the cooling of an introduction stream (72) inside an upstream heat exchanger (28). It includes the introduction of the cooled introduction stream (76) into a fractionating column (50) and the tapping at the bottom portion of the column (50) of the denitrided stream of hydrocarbons. It also includes the introduction of a stream (106) rich in nitrogen obtained from the head portion of the column (50) into a separation container (60) and the recovery of the head gaseous stream from the separation container (60) in order to form the stream (20) which is rich in helium. The liquid stream (110) is obtained from the bottom of the first separation container (60) is separated into a liquid nitrogen stream (18) and a first reflux stream (114) which is introduced as reflux into the head of the fractionating column (50).
摘要:
In this process, the LNG stream is sub-cooled with a refrigerating fluid in a first heat exchanger. This refrigerating fluid undergoes a closed second refrigeration cycle which is independent of the first cycle. The closed cycle comprises a phase of heating the refrigerating fluid in a second heat exchanger, and a phase of compressing the refrigerating fluid in a compression apparatus to a pressure greater than its critical pressure. It further comprises a phase of cooling the refrigerating fluid originating from the compression apparatus in the second heat exchanger and a phase of dynamically expanding of a proportion of the refrigerating fluid issuing from the second heat exchanger in a turbine. The refrigerating fluid is formed by a mixture of nitrogen-containing fluids.
摘要:
The invention concerns a method for refrigerating liquefied natural gas under pressure (1), comprising a first step wherein the LNG (1) is cooled, expanded and separated (a) in a first base fraction (4) which is collected, and (b) a first top fraction (3) which is heated, compressed in a compressor (K1) and cooled into a first compressed fraction (5) which is collected; a second compressed fraction (6) is drawn from the fuel gas (5), cooled then mixed with the cooled and expanded LNG (1). The invention is characterised in that it comprises a second step wherein the second compressed fraction (6) is compressed and cooled, and a flux is (8) drawn and cooled, expanded and introduced in the compressor (K1). The invention also describes other embodiments.
摘要:
A process and apparatus for the purification of a gas, in particular natural gas, in order to eliminate mercaptans without the use of gas adsorption or cryogenic expansion processes. Natural gas, dried and cooled, is supplied to an absorption column under pressure, producing a head product of a purified gas, and a base product supplied to a fractionating column which separates the most volatile compounds, free from mercaptans, from a gasoline fraction of the natural gas. The mercaptans are eliminated at the head of at least one distillation column, producing a base end product consisting of a mixture of C5 hydrocarbons, heavier than and free from volatile mercaptans, partially mixed with the most volatile recompressed compounds of the natural gas. This mixture is cooled and sent by reflux to the absorption column.