公开(公告)号：US5617741A

公开(公告)日：1997-04-08

申请号：US597414

申请日：1996-02-08

申请人： Brian A. McNeil ,  Michael H. Evans

发明人： Brian A. McNeil ,  Michael H. Evans

IPC分类号： F25J3/02 ,  F25J3/08

CPC分类号： F25J3/029 ,  F25J3/0209 ,  F25J3/0233 ,  F25J3/0257 ,  F25J2200/02 ,  F25J2200/04 ,  F25J2200/30 ,  F25J2200/50 ,  F25J2200/70 ,  F25J2200/72 ,  F25J2200/74 ,  F25J2200/78 ,  F25J2210/06 ,  F25J2235/02 ,  F25J2235/60 ,  F25J2240/12 ,  F25J2240/30 ,  F25J2270/02 ,  F25J2270/04 ,  F25J2290/34 ,  F25J2290/40 ,  Y10S62/927

摘要： Nitrogen is removed from a natural gas feed stream by a cryogenic distillation process in which said feed stream is fed to a primary column of a distillation column system having a primary column and a secondary column fed from and operating at substantially the same pressure as the primary column. At least a portion of a primary column methane-rich bottoms liquid is expanded and at least partially vaporized in heat exchange with a condensing primary column nitrogen-enriched vapor. The at least partially condensed primary column nitrogen-enriched vapor is returned to the primary column to provide higher temperature reflux to the distillation column system. A secondary column methane-rich bottoms liquid is at least partially vaporized in heat exchange with a condensing nitrogen-rich overhead vapor to produce a further methane-rich product. At least a portion of the at least partially condensed nitrogen-rich overhead vapor portion is returned to the primary or secondary column to provide lower temperature reflux to the distillation column system.

摘要翻译： 通过低温蒸馏方法从天然气进料流中除去氮气，其中所述进料流被送入蒸馏塔系统的主塔中，所述蒸馏塔系统具有主塔和辅柱，所述主塔和副塔与主塔 柱。 至少一部分主塔甲烷浓缩的底部液体被膨胀并且与冷凝的初级柱富氮蒸气热交换至少部分蒸发。 将至少部分冷凝的主塔富氮蒸气返回到主塔以向蒸馏塔系统提供较高温度的回流。 第二塔富甲烷塔底液体与冷凝的富氮塔顶蒸气热交换至少部分蒸发，以产生更富含甲烷的产物。 至少部分冷凝的富氮塔顶蒸气部分的至少一部分返回到主塔或次塔，以向蒸馏塔系统提供较低温度的回流。

公开(公告)号：US4529425A

公开(公告)日：1985-07-16

申请号：US516840

申请日：1983-07-25

申请人： Brian A. McNeil

发明人： Brian A. McNeil

IPC分类号： F25J3/04

CPC分类号： F25J3/04509 ,  F25J3/04309 ,  F25J3/04412 ,  F25J3/04678 ,  F25J2235/42 ,  F25J2235/50 ,  Y10S62/913

摘要： A plant for producing gaseous oxygen which plant comprises a heat exchanger (6) for cooling feed air, a double distillation column (7) having a high pressure column (8) for receiving at least part of said feed air, and a low pressure column (15), a liquid oxygen storage vessel (19) communicating with said low pressure column (15) and a liquid storage vessel (37) communicating with said high pressure column (8), characterized in that said plant further comprises an expander (27) arranged to expand vapor from said high pressure column (8) and pass the expanded vapor through said heat exchanger (6) and further characterized in that said plant comprises means to control the flow of vapor through said expander (27).

摘要翻译： 一种用于生产气态氧的装置，其包括用于冷却进料空气的热交换器（6），具有用于容纳至少部分所述进料空气的高压塔（8）的双蒸馏塔（7）和低压塔 （15），与所述低压塔（15）连通的液体储氧容器（19）和与所述高压塔（8）连通的液体储存容器（37），其特征在于，所述设备还包括膨胀机（27） ），其布置成从所述高压塔（8）膨胀蒸气并使膨胀的蒸气通过所述热交换器（6），并且其特征还在于，所述设备包括控制通过所述膨胀器（27）的蒸气流的装置。

公开(公告)号：US4526595A

公开(公告)日：1985-07-02

申请号：US538256

申请日：1983-10-03

申请人： Brian A. McNeil

发明人： Brian A. McNeil

IPC分类号： F25J3/04 ,  F25J3/02

CPC分类号： F25J3/04284 ,  F25J3/04321 ,  F25J3/044 ,  F25J3/04412 ,  F25J3/04509 ,  F25J2235/42 ,  F25J2235/50 ,  Y10S62/913

摘要： A plant for producing gaseous nitrogen, which plant comprises a heat exchanger (6) for cooling feed air, a distillation column (8) for receiving at least part of said feed air, a vessel (21), a reflux condenser (12) disposed in said vessel (21) and arranged to receive, in use, vapor from said distillation column (8) and return liquid reflux thereto, a line (18,20) connecting the lower portion of said distillation column (8) to said vessel (21) and having an expansion valve (19) mounted therein, a line (14) for withdrawing nitrogen product from said distillation column (8) and bringing said nitrogen product into heat exchange with said feed air, a crude liquid oxygen (LOX) storage tank (27) communicating with said vessel (21), a liquid nitrogen (LIN) storage tank (34) communicating with said distillation column (8), a line (22) for conveying waste gas from said vessel (21), means to warm said waste gas, an expander (24) to expand said waste gas, means to control the flow of waste gas through said expander, and means to effect heat exchange between the expanded waste gas and the feed air.

摘要翻译： 一种用于生产气态氮的设备，该设备包括用于冷却进料空气的热交换器（6），用于容纳至少部分所述进料空气的蒸馏塔（8），容器（21），设置回流冷凝器（12） 在所述容器（21）中并且布置成在使用中接收来自所述蒸馏塔（8）的蒸气并将液体返回到其中，将所述蒸馏塔（8）的下部连接到所述容器（18）的管线 21），并且具有安装在其中的膨胀阀（19），用于从所述蒸馏塔（8）中抽出氮产物并使所述氮产物与所述进料空气进行热交换的管线（14），粗液氧（LOX）储存器 与所述容器（21）连通的罐（27），与所述蒸馏塔（8）连通的液氮（LIN）储罐（34），用于输送来自所述容器（21）的废气的管线（22） 暖气说废气，膨胀机（24）扩大废气，意味着控制废气的流动 粗糙的膨胀机，以及在膨胀的废气和进料空气之间进行热交换的装置。

公开(公告)号：US4337072A

公开(公告)日：1982-06-29

申请号：US167983

申请日：1980-07-14

申请人： Brian A. McNeil

发明人： Brian A. McNeil

IPC分类号： C01B3/02 ,  F25J3/02 ,  F25J3/00 ,  F25J5/00

CPC分类号： C01B3/025 ,  F25J3/0223 ,  F25J3/0276 ,  F25J2205/30 ,  F25J2210/42 ,  F25J2270/904 ,  F25J2280/02 ,  Y10S165/909 ,  Y10S62/934

摘要： Difficulties associated with the operational stability of a conventional cryogenic plant for manufacturing ammonia synthesis gas from a stream rich in hydrogen and a stream of nitrogen are reduced by using three heat exchangers in place of the conventional single heat exchanger. In use, the first heat exchanger, which is preferably arranged with its cold end uppermost, is used to cool the stream of nitrogen to a temperature which:(a) if the nitrogen is above its critical pressure is between 8.degree. and 28.degree. C. above its critical temperature; or(b) if the nitrogen is below its critical pressure is between 3.degree. and 9.degree. C. above its dew point.Part of the nitrogen leaving the first heat exchanger is passed downwardly through a third heat exchanger where it is further cooled before being introduced into a nitrogen wash column where it acts as reflux. The third heat exchanger is cooled by vapor leaving the top of the nitrogen wash column.

公开(公告)号：US4239647A

公开(公告)日：1980-12-16

申请号：US115302

申请日：1980-01-25

申请人： Brian A. McNeil

发明人： Brian A. McNeil

IPC分类号： C01B3/02 ,  F25J3/02 ,  C01B2/02 ,  F25J3/00

CPC分类号： C01B3/025 ,  F25J3/0223 ,  F25J3/0276 ,  F25J2205/30 ,  F25J2210/42 ,  F25J2270/904 ,  F25J2280/02 ,  Y10S165/909 ,  Y10S62/934

摘要： Difficulties associated with the operational stability of a conventional cryogenic plant for manufacturing ammonia synthesis gas from a stream rich in hydrogen and a stream of nitrogen are reduced by using three heat exchangers in place of the conventional single heat exchanger. In use, the first heat exchanger, which is preferably arranged with its cold end uppermost, is used to cool the stream of nitrogen to a temperature which:(a) if the nitrogen is above its critical pressure is between 8.degree. and 28.degree. C. above its critical temperature; or(b) if the nitrogen is below its critical pressure is between 3.degree. and 9.degree. C. above its dew point.Part of the nitrogen leaving the first heat exchanger is passed downwardly through a third heat exchanger where it is further cooled before being introduced into a nitrogen wash column where it acts as reflux. The third heat exchanger is cooled by vapor leaving the top of the nitrogen wash column.After being cooled in the first heat exchanger the stream rich in hydrogen is passed upwardly in a second heat exchanger where it is further cooled before being introduced into the lower portion of the nitrogen wash column. This further cooling is achieved by:(i) the balance of the vapor leaving the top of the nitrogen wash column; and(ii) vaporizing the two phase mixture formed by expanding the liquid in the bottom of the nitrogen wash column; and(iii) adding external refrigeration if necessary.The overall layout has the advantage that the stream of nitrogen is passing downwardly in the third heat exchanger which operates in the temperature range where the density of the nitrogen increases rapidly as its temperature falls. In addition the largely liquid two phase mixture from the bottom of the nitrogen wash column vaporizes as it passes downwardly through the second heat exchanger thereby reducing the problems associated with slug flow.Although three heat exchangers are used the overall capital cost of the installation is comparable with a conventional installation. This is because certain phase separators and distributors can be omitted.A modification is also described which facilitates recovery of most of the small amount of hydrogen in the liquid leaving the bottom of the nitrogen wash column.