Abstract:
A method for the production of liquefied natural gas is provided. The method may include providing a high pressure natural gas stream (2), splitting the high pressure natural gas stream into a first portion (102) and a second portion (106), and liquefying the first portion of the high pressure natural gas stream to produce an LNG stream (6). The refrigeration needed for cooling and liquefaction of the natural gas can be provided by a nitrogen refrigeration cycle (6) and letdown of the second portion of the high pressure natural gas stream.
Abstract:
The described invention relates to processes and systems for treating a gas stream, particularly one rich in methane for forming liquefied natural gas (LNG), said process including: (a) providing a gas stream; (b) providing a refrigerant; (c) compressing said refrigerant to provide a compressed refrigerant; (d) cooling said compressed refrigerant by indirect heat exchange with a cooling fluid; (e) expanding the refrigerant of (d) to cool said refrigerant, thereby producing an expanded, cooled refrigerant; (f) passing said expanded, cooled refrigerant to a first heat exchange area; (g) compressing the gas stream of (a) to a pressure of from greater than or equal to 1,000 psia to less than or equal to 4,500 psia; (h) cooling said compressed gas stream by indirect heat exchange with an external cooling fluid; and heat exchanging the compressed gas stream with the expanded, cooled refrigerant stream.
Abstract:
Procédé de liquéfaction d'un courant de gaz naturel comprenant les étapes suivantes : Etape a) : Refroidissement du courant gazeux d'alimentation pour obtenir un courant de gaz naturel liquéfié à une température T1; Etape b) : Introduction du courant issu de l'étape a) dans une colonne de déazotation à une pression P2 et une température T2 inférieure à T1 pour produire, en cuve de ladite colonne, un courant de gaz naturel liquéfié déazoté et, en tête, un courant de vapeur enrichi en azote; Etape c) : Condensation du courant de vapeur enrichi en azote issu de l'étape b) dans un échangeur de chaleur; Etape d) : Introduction du courant issu de l'étape c) dans un pot séparateur de phases pour produire un courant liquide et un courant gazeux enrichi en azote; Etape e) : Introduction du courant gazeux issu de l'étape d) dans une colonne de distillation à la pression P2 produisant, en tête, un courant enrichi en azote contenant moins de 1% de méthane et, encuve, un courant liquide contenant moins de 10% d'azote; caractérisé en ce qu'au moins une partie du courant liquide issu de l'étape b) est utilisée durant l'étape c) pour refroidir le courant de vapeur enrichi en azote issu de l'étape b) dans ledit échangeur de chaleur.
Abstract:
In a process for supplying gaseous carbon monoxide by cryogenic distillation, a feed gas (1), containing carbon monoxide as at least one of its principal components and at least one other components chosen from methane, nitrogen and hydrogen, is purified using an adsorption step in one of at least two adsorbent beds (3) to produce a purified feed gas to be sent to the separation unit comprising at least one distillation column (7, 19, 27), the separation unit separates the feed gas to produce gaseous carbon monoxide and the gaseous carbon monoxide is compressed in a product compressor (35) to produce a final product at a product pressure, refrigeration is supplied to the process by a carbon monoxide cooling cycle in which a cycle fluid is compressed in at least the product compressor, cooled and expanded, at least part of the carbon monoxide is liquefied to form pressurised liquefied carbon monoxide and part of the pressurised liquefied carbon monoxide (51 A, 53A, 59A), is vaporised at the product pressure to form a pressurised gaseous back-up stream which is then mixed with the final product, vaporisation of the carbon monoxide taking place only when there is an increase in demand for pressurised carbon monoxide.
Abstract:
Dans un procédé de séparation d'un mélange comprenant au moins du monoxyde de carbone, de l'hydrogène et du méthane dans lequel on sépare le mélange par un premier moyen de séparation (C1), on envoie au moins une fraction liquide de la cuve du moyen de séparation à une colonne d'épuisement (C2), on envoie au moins une partie de la fraction liquide de la colonne d'épuisement à une colonne de séparation CO/CH 4 (C3) pour produire un débit liquide enrichi en méthane et un débit gazeux enrichi en monoxyde de carbone et on produit un débit gazeux riche en monoxyde de carbone, le procédé étant tenu en froid au moins partiellement par un cycle de monoxyde de carbone, ledit cycle assurant au moins partiellement la condensation en tête de la colonne de séparation CO/CH 4 et/ou le rebouillage en cuve de la colonne d'épuisement et/ou le rebouillage en cuve de colonne de séparation CO/CH 4 et/ou le refroidissement du mélangé destiné au premier moyen de séparation.
Abstract:
Method for the rejection of nitrogen from condensed natural gas which comprises (a) introducing the condensed natural gas into a distillation column at a first location therein, withdrawing a nitrogen-enriched overhead vapor stream from the distillation column, and withdrawing a purified liquefied natural gas stream from the bottom of the column; (b) introducing a cold reflux stream into the distillation column at a second location above the first locatino, wherein the refrigeration to provide the cold reflux stream is obtained by compressing and work expanding a refrigerant stream comprising nitrogen; and (c) either (1) cooling the purified liquefied natural gas stream or cooling the condensed natural gas stream or (2) cooling both the purified liquefied natural gas stream and the condensed natural gas stream, wherein refrigeration for (1) or (2) is obtained by compressing and work expanding the refrigerant stream comprising nitrogen. The refrigerant stream may comprise all or a portion of the nitrogen-rich vapor stream from the distillation column.
Abstract:
A method to recover and process hydrocarbons from a gas flare system to produce natural gas liquids (NGL), cold compressed natural gas (CCNG), compressed natural gas (CNG) and liquid natural gas (LNG). The method process provides the energy required to recover and process the hydrocarbon gas stream through compression and expansion of the various streams.
Abstract:
본 발명은 사워 가스(Sour Gas)로부터 분리된 액체 이산화탄소를 교축 감압 팽창시키고, 저온으로 기액 분리하여 선박 운송 또는 석유 회수증진용으로 공급하는 실시예와, 한계가스정(stranded gas well)으로부터 발생되는 사워 가스(sour gas)로부터 분리 배출되는 액체 이산화탄소에 한계가스정으로부터 발생되는 메탄을 냉매로써 통과시켜 액체 이산화탄소를 냉각시키는 실시예로부터 한계가스정의 사워 가스로부터 분리되는 물질을 냉매로 하여 이산화탄소를 냉각시킴으로써 이산화탄소 저장 및 포집용이나 석유 회수증진용 등 극저온의 액체 이산화탄소의 수요처에 적합한 온도 및 상태 조건으로 공급될 수 있도록 하는 이산화탄소의 처리 모듈 및 그 처리 방법에 관한 것이다.
Abstract:
Argon, oxygen and nitrogen contained within an incoming air feed (10) is fractionated within an air separation system having a multiple column arrangement (32) that includes a higher pressure column (30) and a lower pressure column (34) to produce oxygen and nitrogen-rich fractions and an argon column (90) to produce an argon-rich fraction for recovery of the argon as an argon product. A two-phase stream (132; 134) can be formed by either expanding at least part of a liquid air stream (82) or by a liquid oxygen column bottoms (132) formed within a higher pressure column (30) of the multiple column arrangement (32). The liquid air stream (82) is formed by liquefying part of the air feed (22) to be fractionated against vaporizing a pumped liquid stream (76) composed of nitrogen and/or oxygen. The diversion of nitrogen vapor (146; 166) contained in the nitrogen-rich fraction increases the liquid to vapor ratio within the lower pressure (34) column to increase the argon recovery.
Abstract:
In a process for providing gaseous carbon monoxide and/or a mixture containing at least 10% carbon monoxide, carbon monoxide is stored in liquid form in a storage vessel (47) and, when required, is withdrawn from the storage vessel and vaporised in a vaporiser (53) to produce gaseous carbon monoxide when the gaseous production of carbon monoxide is insufficient.