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    • 4. 发明申请
    • PROCESS AND DEVICE FOR CRYOGENIC AIR FRACTIONATION
    • 低温空气分离的方法和装置
    • US20110214453A1
    • 2011-09-08
    • US13058723
    • 2009-08-11
    • Alexander Alekseev
    • Alexander Alekseev
    • F25J3/04
    • F25J3/04181C01B13/0248C01B13/0259C01B2210/0046F25J3/0409F25J3/04157F25J3/04206F25J3/04218F25J3/04309F25J3/04412F25J3/04533F25J3/04581F25J3/04618F25J3/0486F25J3/04878F25J3/04957F25J2205/32F25J2205/34F25J2205/70F25J2210/06F25J2240/44F25J2245/42F25J2250/40F25J2250/50
    • The process and the device serve for cryogenic air fractionation, in particular for supplying an oxygen-enriched (product stream to an oxyfuel power plant. The distillation column system for nitrogen/oxygen separation has a high-pressure column (26) and a low-pressure column (32). The high-pressure column (26) and the low-pressure column (32) are thermally coupled via a condenser-evaporator (37). Feed air (1) is compressed in an air compressor (3), cooled at least in a first post-cooler (6) and purified in a purification device (22), cooled in a main heat exchanger (23a, 23b, 23c) and introduced at least in part (25, 29) into the high-pressure column (26). At least one liquid stream (33, 35) is introduced from the high-pressure column (26) into the low-pressure column (32). An oxygen-enriched product stream (41, 45, 46,47, 48) is taken off from the low-pressure column (32). A first nitrogen stream (63, 64, 65, 66) is withdrawn from the high-pressure column (26) and warmed to a temperature of at least 280 K (6). The warmed first nitrogen stream (67) is work-expanded (72) in a first warm expansion engine (68). The first nitrogen stream (70, 71) which is expanded in the first warm expansion engine (68) is work-expanded in a second warm expansion engine (72).
    • 该方法和装置用于低温空气分馏,特别是用于向富氧燃料发电厂供应富氧(产物流),用于氮气/氧气分离的蒸馏塔系统具有高压塔(26)和低压塔 高压塔(26)和低压塔(32)通过冷凝器 - 蒸发器(37)热耦合,进料空气(1)在空气压缩机(3)中被压缩, 至少在第一后冷却器(6)中冷却并在纯化装置(22)中净化,在主热交换器(23a,23b,23c)中冷却,并将至少部分(25,29)引入高压釜 至少一个液体流(33,35)从高压塔(26)引入低压塔(32)中,富氧产物流(41,45,46, 从高压塔(32)中取出第一氮气流(63,64,65,66)从高压塔(26)中取出并加热到温度 至少280 K(6)。 加热的第一氮气流(67)在第一暖膨胀发动机(68)中工作膨胀(72)。 在第一暖膨胀发动机(68)中膨胀的第一氮气流(70,71)在第二暖膨胀发动机(72)中工作膨胀。
    • 6. 发明申请
    • PROCESS AND DEVICE FOR LOW-TEMPERATURE SEPARATION OF AIR
    • US20090188280A1
    • 2009-07-30
    • US12282606
    • 2007-03-06
    • Alexander AlekseevDietrich RottmannFlorian SchliebitzDirk Schwenk
    • Alexander AlekseevDietrich RottmannFlorian SchliebitzDirk Schwenk
    • F25J3/08
    • F25J3/04454F25J3/04054F25J3/0409F25J3/04175F25J3/04193F25J3/04296F25J3/04303F25J3/04393F25J3/04412F25J2240/04
    • The process and the device are used for low-temperature separation of air with a distilling-column system for nitrogen-oxygen separation (20), which has at least one separation column (21, 22). A main air stream (1, 5) is compressed in an air compressor (2) and purified in a purification device (4). A first air stream (7) and a second air stream (8) are diverted from the main air stream (5). The first air stream (7) is further compressed in two secondary compressors (10, 13) that are connected in series. The further compressed first air stream (15) is cooled by indirect heat exchange (16), and at least partially liquefied or pseudo-liquefied, and then introduced into the distilling-column system for nitrogen-oxygen separation (20). The second air stream (8) is cooled by indirect heat exchange (16) and then, divided into two partial streams (24, 27), is actively depressurized in two expanders (25, 28), whereby the two expanders have essentially the same inlet pressure. The actively depressurized partial streams (26, 29) of the second air stream are introduced (30, 129) at least in part into the distilling-column system for nitrogen-oxygen separation (20). The mechanical energy that is produced in the active depressurization (25, 28) of the second air stream is used at least partially in the driving of the two secondary compressors (10, 13) that are connected in series. A liquid product stream (31) is removed from the distilling-column system for nitrogen-oxygen separation (20), brought to an elevated pressure in the liquid state (32), and evaporated or pseudo-evaporated under this elevated pressure by indirect heat exchange (16) with the first air stream (15), and finally removed as a gaseous product stream (34). Both secondary compressors (10, 13) are operated with an inlet temperature that is higher than 250 K, in particular higher than 270 K.