摘要:
The method involves compressing a coolant mixture in a pre-final stage (1A) through a series of stages of a compression unit (1). The mixture is condensed partially by cooling, and then is separated to produce a vapour fraction and a liquid fraction. The vapour fraction is cooled and partially condensed, and then passed through a final compression stage (1C) to obtain a high-pressure vapour. Part of the high-pressure vapour fraction and liquid fraction is then cooled, expanded and circulated through a first heat exchanger (5). During the vapour fraction's cooling and partial condensation stage, the vapour fraction obtained from the separation of the condensed mixture is cooled by passing it through a second heat exchanger (18) with the coolant. The condensed mixture is separated in a first separator (14). The vapour fraction from it is condensed in the second heat exchanger, and then passed through a second separator (15) to produce a vapour and a liquid fraction. The vapour fraction is sent to the final compression stage, and the liquid fraction to the first heat exchanger.
摘要:
A natural gas liquefaction process comprises passing natural gas through a series of heat exchangers (150, 151, 153) in countercurrent relationship with a gaseous refrigerant circulated through work expansion cycle. The work expansion cycle comprises compressing the refrigerant, dividing and cooling the refrigerant to produce at least first and second cooled refrigerant streams (126, 128), substantially isentropically expanding the first refrigerant stream (126) to a coolest refrigerant temperature, substantially isentropically expanding the second refrigerant stream (128) to an intermediate refrigerant temperature warmer than said coolest refrigerant temperature, and delivering the refrigerant in the first and second refrigerant streams (126, 128) to a respective heat exchanger (153, 151) for cooling the natural gas through corresponding temperature ranges. The refrigerant in the first stream (126) is isentropically expanded to a pressure at least 10 times greater than the total pressure drop of the first refrigerant stream across said series of heat exchangers (150, 151, 153), said pressure being in the range of 1.2 to 2.5 MPa.
摘要:
The present invention is a process for the liquefaction of hydrogen which utilizes a dense fluid expander 34 and neon as a precoolant refrigerant. In the process, a two phase mixture containing about 85-90% liquid of greater than 95% para-hydrogen is produced in a dense fluid expander. Most of the refrigeration for liquefaction is supplied by a neon refrigeration system, consisting of a centrifugal compressor 94 heat exchangers (18, 22, 26, 30) and one or more stages (76, 84) of neon expansion. As an option, further refrigeration may be supplied utilizing liquid nitrogen as another precoolant.
摘要:
A cryogenic rectification system wherein some or all of the refrigeration necessary to drive the rectification is generated by providing a pulse to a gas and then passing the compressed gas to a pulse tube wherein the gas expands in a wave generating refrigeration at one end of the pulse tube for transfer into the rectification system.
摘要:
Compressed and purified air is separated in a distillation column 12 into a nitrogen-rich vapour and an oxygen-rich liquid. Nitrogen-rich vapour is condensed in a condenser 18 in indirect heat exchange with a stream of the oxygen-rich liquid. A part of the condensate is employed s reflux in the column 12 and another part taken as liquid nitrogen product. The condenser 10 is also cooled by a supplemental liquid nitrogen stream. Both the oxygen-rich stream and the supplemental liquid nitrogen stream are vaporised. One part of the oxygen rich vapour is compressed in a compressor 38 which drives a turboexpander 42 coupled thereto through a heat dissipative brake 46. The other part of the oxygen-rich vapour is expanded in the turboexpander 42. The vaporised supplemental nitrogen stream is rewarmed and reliquefied in a nitrogen liquefier.
摘要:
Verfahren zum Verflüssigen einer unter Druck stehenden kohlenwasserstoffreichen Fraktion, bei dem diese im Wärmetausch mit anzuwärmenden Verfahrensströmen abgekühlt und verflüssigt wird und anschließend mittels eines Entspannungsventils (b) in einen Speicherbehälter (S) entspannt wird und wobei das aus dem Speicherbehälter (S) austretende Boiloff-Gas, das gegebenenfalls einen der anzuwärmenden Verfahrensströme bildet, ein- oder mehrstufig verdichtet wird, wobei der Durchsatz des Boiloff-Gas-Verdichters (V) über die Stellung des Entspannungsventils (b) mittels eines dieses Entspannungsventil regelnden FIC-Reglers (F) konstant auf Vollast gehalten wird, wobei der Druck nach dem Entspannungsventil (b) konstant gehalten wird.
摘要:
A cryogenic rectification system wherein condensed heat pump fluid is subcooled in the upper portion of an argon column (8), cools incoming feed (in 3), and is compressed (18) and then condensed against cryogenic rectification plant bottoms for reboil (10) thus improving reflux ratios and increasing argon recovery.