Abstract:
Impurities that are less volatile than carbon dioxide, e.g. hydrogen sulfide, are removed from crude carbon dioxide by processes involving distillation of said crude carbon dioxide in a distillation column system operating at super-atmospheric pressure(s) to produce carbon dioxide-enriched overhead vapor and bottoms liquid enriched with said impurities. Where such processes involve a single heat pump cycle, significant savings in power consumption are realized when the distillation column system is re-boiled by at least partially vaporizing liquid in or taken from an intermediate location in the column system.
Abstract:
In a method for cooling a flow containing at least 35% carbon dioxide and at least 0.2 µg/Nm3 of mercury, the mercury being in liquid and/or gas form, the flow is cooled in a first brazed aluminium plate-fin heat exchanger (9) from a first temperature to a second temperature higher than -38.6°C to form a cold flow at the second temperature, and the flow cooled to the second temperature is cooled in a second heat exchanger (35), which is a tube and shell heat exchanger, to a third temperature lower than -38.6°C.
Abstract:
L'invention concerne un procédé de traitement d'un gaz naturel contenant du dioxyde de carbone dans lequel : - le gaz naturel est séparé par un procédé cryogénique pour fournir d'une part un flux de dioxyde de carbone liquide, contenant des hydrocarbures, et d'autre part du gaz naturel purifié; - au moins une partie du gaz naturel est refroidie dans un premier échangeur de chaleur puis dans un deuxième échangeur de chaleur avant ledit procédé cryogénique et / ou avant un reflux vers ledit procédé cryogénique; - au moins une partie du flux de dioxyde de carbone liquide est récupérée pour fournir un flux de dioxyde de carbone recyclé; - le flux de dioxyde de carbone recyclé est divisé en une première portion et une deuxième portion; - la première portion est détendue puis est réchauffée dans le premier échangeur de chaleur, pour fournir un premier flux de dioxyde de carbone réchauffé; - la deuxième portion est refroidie, puis au moins une partie de la deuxième portion est détendue puis est réchauffée dans le deuxième échangeur de chaleur, pour fournir un deuxième flux de dioxyde de carbone réchauffé; - au moins une partie des hydrocarbures contenus dans le premier flux de dioxyde de carbone réchauffé et dans le deuxième flux de dioxyde de carbone réchauffé sont récupérés par séparation liquide / gaz. L'invention concerne également une installation adaptée à la mise en œuvre de ce procédé.
Abstract:
Method and system for compressing a fluid in a gas phase and for pumping the fluid in a dense phase. The system (10) includes a compressor part (12) having an impeller; a compressor part inlet (32) that receives the fluid in the gas phase; a compressor part outlet (36) that provides the fluid in the gas phase; a temperature changing device (40) that changes a phase of the fluid; a pump part (14) having an impeller; a pump part inlet that receives the fluid in the dense phase from the compressor part outlet; a pump part outlet that outputs the fluid in the dense phase from the system; a single bull gear (20) configured to rotate around an axial axis with a predetermined speed; plural pinions (22) contacting the single gear bull and configured to rotate with predetermined speeds, and a pump shaft (23) configured to rotate the at least one impeller of the pump part.
Abstract:
Disclosed are methods of obtaining carbon dioxide from a CO2-containing gas mixture. The methods combine the benefits of gas membrane separation with cryogenic temperatures.
Abstract:
The present invention relates to an enhanced oil recovery process that is integrated with a synthesis gas generation process, such as gasification or methane reforming, involving combined capture and recycle of carbon dioxide from both processes.
Abstract:
Method of purifying a feed stream containing carbon dioxide (10) wherein the feed stream after having been compressed and dried is partly cooled and then used to reboil a stripping column (28). Thereafter, the feed stream is further cooled and expanded to a lower operational temperature of the stripping column. A carbon dioxide product stream (38) composed of the liquid column bottoms of the stripping column is expanded at one or more pressures to generate refrigeration, then fully vaporized within the main heat exchanger (24) and compressed by a compressor (48) to produce a compressed carbon dioxide product (50). Refrigeration is recovered in the main heat exchanger (24) from a column overhead stream (31) extracted from the stripping column (28) within the main heat exchanger (24) either directly or indirectly by auxiliary processing in which carbon dioxide is further separated and optionally recycled back to the main compressor (12) used in compressing the feed stream (10).
Abstract:
A method of producing a carbon dioxide product stream (756) from a synthesis gas stream (18) formed within a hydrogen plant (1) having a synthesis gas reactor (10), a water-gas shift reactor (14), located downstream of the synthesis gas reactor to form the synthesis gas stream (18) and a hydrogen pressure swing adsorption unit (20) to produce a hydrogen product (22) recovered from the synthesis gas stream. In accordance with the invention, the carbon dioxide is separated from the synthesis gas stream in a vacuum pressure swing adsorption system (80) to produce a hydrogen-rich gas stream (76) and a crude carbon dioxide stream (82) and then purifying the crude carbon dioxide stream by a sub- ambient temperature distillation process thereby to produce the carbon dioxide product (756). A hydrogen synthesis gas feed stream (78) to the hydrogen pressure swing adsorption unit is formed at least in part from the hydrogen- rich stream.
Abstract:
Eine Dampferzeugungsanlage umfasst einen Dampferzeuger (1) mit einer Brennkammer (8), einem Verdampfer, einem Überhitzer (9), einem Zwischenüberhitzer (12), einem Kondensator (14), durch Dampf regenerativ beheizte Speisewasservorwärmer (16, 19, 19'), ferner einen Dampfturbinensatz (2) mit einem Hochdruckteil (4), einem Mitteldruckteil (5) und einem Niederdruckteil (6), sowie eine Rauchgasleitung (22) im Anschluss an die Brennkammer (8), eine Luftzuführungsleitung (21) zur Zuführung von Verbrennungsluft in die Feuerung der Brennkammer (8) und einen von Rauchgas und Verbrennungsluft durchströmten Luftvorwärmer (3). In dieser Dampferzeugungsanlage ist von der Luftzuführungsleitung (21) stromabwärts von dem Luftvorwärmer (3) eine Luftleitung (23) abgezweigt und zu einer Luftzerlegungsanlage (25) geführt. In der Luftleitung (23) sind Luftkühler (34, 35) angeordnet, die von Kondensat bzw. Speisewasser aus dem Kondensat/Speisewasser/Kreislauf des Dampferzeugers (1) durchströmt sind. Der Sauerstoffausgang der Luftzerlegungsanlage (25) ist über eine Sauerstoffleitung (26) mit der Feuerung der Brennkammer (8) verbunden.
Abstract:
A method of separating light component(s), such as helium, from carbon dioxide. A pressurized feed stream (10) is at least partially condensed. The resulting containing light component(s) and carbon dioxide stream (14) is degassed to produce a first vapor stream (22) enriched in the light component(s) and a first liquid stream (20) having entrained light component(s). The first liquid stream (20) is expanded (26) to create another two-phase stream (28) that is degasified to produce a second vapor stream, (36) enriched in the light component(s), and a second liquid stream (38) enriched in carbon dioxide. The second liquid stream (38) is repressurized and vaporized. In case of a supercritical feed (90), the pressurized feed stream (90) is expanded (94) after having been cooled. Thereafter, the feed (98) is degassed to produce the light component enriched vapor stream (102) and a liquid stream enriched in the carbon dioxide (104). The resultant vapor streams, enriched in the light component(s) may be further processed to isolate the light components.