摘要:
Method for producing liquefied natural gas and a stream of liquid nitrogen comprising at least the following steps: step a): production of gaseous nitrogen by an air separation unit (ASU); step b): liquefaction of a stream of natural gas in a natural gas liquefaction unit comprising a main heat exchanger and a frigorie production system; step c): liquefaction of the stream of nitrogen originating from step a) in the said main exchanger of the natural gas liquefaction unit in parallel with the natural gas liquefied in step b); characterized in that all the cold required for liquefying the stream of nitrogen and for liquefying the natural gas is supplied by the said frigorie production system of the natural gas liquefaction unit.
摘要:
The invention relates to a method for cooling, purifying and separating a gaseous mixture (1) containing at least one impurity, in which the gaseous mixture is cooled to a temperature no higher than the temperature at which the at least one impurity solidifies in a heat exchanger (3, 3A) having cooling passages, the cooling passages being at least partially covered with a coating and/or physically treated and/or chemically treated, the coating and/or the treatment serving to limit or even to prevent the solidified impurity from forming and/or adhering to a surface of the passages; at least one portion (5B, 19) of the solidified impurity exiting the cooling passages of the heat exchanger is collected; and the gaseous mixture is drawn from the heat exchanger.
摘要:
A process for separating air by cryogenic distillation in a column system comprising a high pressure column and a low pressure column comprises compressing all the feed air in a first compressor (1) to a first outlet pressure, sending a first part of the air at the first outlet pressure to a second compressor (3) and compressing the air to a second outlet pressure, cooling at least part of the air at the second outlet pressure in a heat exchanger (5) to form cooled compressed air at the second outlet pressure, sending at least part (7) of the cooled compressed air at the second outlet pressure to a third compressor (8) and compressing the at least part of the cooled compressed air at the second outlet pressure to a third outlet pressure, liquefying at least part of the air at the third outlet pressure and sending the liquefied air (10) to at least one column of the column system wherein at least 50% of the liquefied air sent to the column system has been compressed in the third compressor (8), cooling a second part of the air (12) at the first outlet pressure in the heat exchanger and expanding at least part of the second part of the air in an expander (13) from the first outlet pressure to the pressure of a column (30, 31) of column system and sending the expanded air to that column, removing liquid (20) from a column of the column system and vaporizing the liquid by heat exchange in the heat exchanger.
摘要:
An apparatus for liquifying and storing a gas is provided. The apparatus is adapted to liquify relatively small quantities of gas, and to do so in a residence or place of business. The apparatus generally includes a cryocooler (202), a heat transfer assembly (204), and an insultated subsystem (206). Liquid condensate produced by the apparatus is stored in an insulated dewar. The method of the present invention includes the liquefaction of air or an enriched gas on a small scale in a residence or place of business. The method and apparatus of the invention are particularly well suited for providing liquified oxygen for use by a patient on oxygen therapy in the patient's residence.
摘要:
A cryogenic air separation system wherein pressure energy is supplied by a bridge machine having one or more booster compressors (55,61,63) and a multicomponent refrigerant fluid compressor (157) of a multicomponent refrigerant fluid circuit, all of the compressors of the bridge machine driven by power supplied through a single gear case (60).
摘要:
A system for generating refrigeration and providing the refrigeration into a cryogenic rectification plant wherein, in addition to refrigeration generated by turboexpansion, further refrigeration for the plant is generated by a recirculating multicomponent refrigerant in a refrigeration circuit.
摘要:
Dans ce procédé à deux turbines (11, 13) et à au moins deux étages (9, 10) de compression du gaz de cycle, on alimente les deux turbines (11, 13) à une même pression d'admission, on détend le gaz de cycle dans la turbine chaude (11) jusqu'à une première pression d'échappement, et on détend le gaz de cycle dans la turbine froide (13) jusqu'à une seconde pression d'échappement plus basse que la première pression d'échappement. Application aux installations de distillation d'air.
摘要:
La totalité de l'air est comprimée à une première haute pression puis est séparée en deux fractions. La première fraction, représentant au moins 70% du débit, est surpressée à une seconde haute pression et refroidie dans la ligne d'échange thermique (6) jusqu'à une température intermédiaire, où une partie est turbinée (en 4) à la moyenne pression tandis que le reste est liquéfié. La seconde fraction est refroidie et liquéfiée (20A) dans la ligne d'échange thermique, en un ou plusieurs flux à une ou plusieurs pressions comprises entre ladite première haute pression et ladite seconde haute pression.
摘要:
A process and apparatus for the ultrapurification of cryogenic low boiling liquified gases such as oxygen and nitrogen which contain trace impurities. The impure gas (20) is introduced into a first distillation column (32) and is substantially at its liquid-gas equilibrium temperature at the pressures within the first distillation column. Here the gas is separated by distillation into a first vapor fraction (100) containing low boiling point impurities and a first liquid fraction (38) containing high boiling point impurities. The first vapor fraction is withdrawn and introduced into a second distillation column (52).The first vapor fraction is substantially at the liquid-gas equilibrium temperature at the pressures within the second distillation column. Here the vapor fraction is separated by distillation into a second vapor fraction (94) containing high boiling point impurities and a second liquid fraction (60) free of trace impurities which is withdrawn as product. Cooling for the process is provided by indirect heat exchange with a cryogenic low boiling gas such as nitrogen, oxygen, or air. The gas to be purified as well as the heat exchange gas can be obtained from a standard air separation unit or the process can be conducted using gases obtained from storage.