公开(公告)号：US5983668A

公开(公告)日：1999-11-16

申请号：US069620

申请日：1998-04-29

申请人： David Miller Espie

发明人： David Miller Espie

IPC分类号： F25J3/04 ,  F25J1/00

CPC分类号： F25J3/04606 ,  F25J3/04412 ,  F25J3/0449 ,  F25J3/04545 ,  F25J3/04575 ,  F25J3/046 ,  F25J3/04848 ,  F25J2200/20 ,  F25J2245/42 ,  F25J2290/62 ,  Y02E20/16 ,  Y02E20/18

摘要： A cryogenic air separation system which is subject to periods of significant changes in product demand is controlled during such periods to minimize the impact of transient operation on product purity. The feed air is introduced directly into the higher pressure column of a distillation system having at least two columns, and nitrogen-rich and oxygen-rich vapor products are withdrawn from the lower pressure column. The flow rate of the nitrogen-rich vapor product is controlled as a function of the feed air flow rate by a feed air flow controller which controls the suction pressure of the nitrogen product compressor. The set point of the flow controller is manipulated as a function of the composition of the oxygen-enriched vapor product. A nitrogen-rich liquid is withdrawn from the higher-pressure column and introduced into the lower-pressure column as reflux. An inventory of this liquid is maintained in a holdup tank for storage or withdrawal during periods of transient operation. A feedforward control system increases or decreases the flow rates of the nitrogen-rich vapor product, the oxygen-rich vapor product, and the nitrogen-rich liquid during periods of increasing or decreasing product demand by manipulation of the set points of the feed air, the oxygen-rich vapor product, and the nitrogen-rich liquid flow controllers.

摘要翻译： 受制于产品需求发生重大变化的低温空气分离系统在此期间进行控制，以尽量减少瞬态操作对产品纯度的影响。 将进料空气直接引入具有至少两个塔的蒸馏系统的高压塔中，从低压塔中取出富氮和富氧蒸气产物。 通过控制氮气压缩机的吸入压力的进料空气流量控制器来控制富氮蒸气产物的流量作为进料空气流速的函数。 作为富氧蒸气产物的组成的函数来操作流量控制器的设定点。 将富氮液体从高压塔中取出并作为回流引入低压塔中。 在瞬时操作期间，将该液体的库存保持在储存罐中用于储存或取出。 在通过操纵进料空气的设定点来增加或减少产品需求期间，前馈控制系统增加或减少富氮蒸气产物，富氧蒸汽产物和富氮液体的流量， 富氧蒸气产物和富氮液体流量控制器。

公开(公告)号：US6073463A

公开(公告)日：2000-06-13

申请号：US169224

申请日：1998-10-09

申请人： David Miller Espie

发明人： David Miller Espie

IPC分类号： F25J3/04

CPC分类号： F25J3/04793 ,  F25J3/04181 ,  F25J3/04412 ,  F25J3/04848 ,  F25J2205/64 ,  F25J2205/72

摘要： The present invention concerns a cryogenic air separation process which intermittently diverts a portion of the air feed as repressurization gas for a front-end two bed pressure swing adsorption adsorption system which system is used to remove impurities from the air feed. In particular, the present invention is an improvement to said process for at least partially eliminating reductions in the purity of the product streams from the air separation unit caused by the intermittent diversions of the air feed as repressurization gas. The improvement comprises reducing the flow of both the nitrogen-enriched waste stream and the crude liquid oxygen stream from the air separation unit during those intermittent periods when repressurization gas is required in the pressure swing adsorption system.

摘要翻译： 本发明涉及一种低温空气分离方法，其间歇性地将一部分空气进料作为再加压气体，用于前端两床变压吸附系统，该系统用于从空气进料中除去杂质。 特别地，本发明是对所述方法的改进，所述方法至少部分地消除了由作为再加压气体的空气进料的间歇转移引起的空气分离单元的产物流的纯度的降低。 改进包括在变压吸附系统中需要再加压气体的那些间歇期期间减少来自空气分离单元的富氮废物流和粗液氧流的流动。

公开(公告)号：US5968234A

公开(公告)日：1999-10-19

申请号：US59696

申请日：1998-04-14

申请人： Dan Earl Midgett, II ,  David Miller Espie

发明人： Dan Earl Midgett, II ,  David Miller Espie

IPC分类号： B01D53/04 ,  B01D53/26

CPC分类号： F25J3/04181 ,  B01D53/0462 ,  F25J3/0403 ,  F25J3/04575 ,  F25J3/04775 ,  B01D2253/106 ,  B01D2253/108 ,  B01D2253/25 ,  B01D2257/104 ,  B01D2257/504 ,  B01D2257/80 ,  B01D2259/40056 ,  B01D2259/40086 ,  B01D2259/4009 ,  B01D53/261 ,  F25J2200/20 ,  F25J2205/68 ,  F25J2205/70 ,  F25J2230/04 ,  F25J2245/42 ,  F25J2290/12 ,  Y02C10/08

摘要： The present invention relates to a thermally regenerable adsorptive process for the purification of a feed air, wherein the feed air is contacted with a solid adsorbent to remove at least water and carbon dioxide, wherein, periodically, the solid adsorbent is thermally regenerated by contacting the solid adsorbent with a regeneration gas stream which is essentially free of at least water and carbon dioxide, wherein the regeneration gas is a nitrogen-enriched stream removed from an elevated pressure air separation unit fed with the purified feed air, characterized in that the removed nitrogen-enriched stream is compressed in a multiple staged compressor and that the regeneration gas is a portion of the nitrogen-enriched stream which is removed from an interstage of the multiple stage compressor and then contacted with the solid adsorbent. The process is particularly suited for use with a solid adsorbent selected from the group consisting of 13X zeolite, silica gel, A zeolite, Y zeolite, mordenite, chabazite and mixtures thereof. Finally, the process of the present invention can comprise recycling the regeneration gas after contact with the solid adsorbent to one of the stages of the multiple stage compressor, preferably, from the stage from which it was removed.

摘要翻译： 本发明涉及用于纯化进料空气的热可再生吸附方法，其中进料空气与固体吸附剂接触以除去至少水和二氧化碳，其中周期性地通过使固体吸附剂与 具有基本上至少不含水和二氧化碳的再生气流的固体吸附剂，其中再生气体是从进料有纯化进料空气的高压空气分离单元中除去的富氮流，其特征在于除去的氮 富集的流在多级压缩机中被压缩，并且再生气体是富氮流的一部分，其从多级压缩机的级间中被除去，然后与固体吸附剂接触。 该方法特别适用于选自13X沸石，硅胶，A沸石，Y沸石，丝光沸石，菱沸石及其混合物的固体吸附剂。 最后，本发明的方法可以包括将再生气体与固体吸附剂接触后再循环到多级压缩机的一个级中，优选从其被除去的阶段。

公开(公告)号：US6070433A

公开(公告)日：2000-06-06

申请号：US240257

申请日：1999-01-29

申请人： Oliver Jacob Smith, IV ,  David Miller Espie

发明人： Oliver Jacob Smith, IV ,  David Miller Espie

IPC分类号： F25J3/04 ,  F25J1/00

CPC分类号： F25J3/04703 ,  F25J3/04412 ,  F25J3/04478 ,  F25J3/04672 ,  F25J3/04727 ,  F25J3/048 ,  F25J3/04969 ,  F25J2200/90 ,  F25J2205/02 ,  F25J2235/58 ,  F25J2245/58 ,  Y10S62/924

摘要： A process for separating mixtures which comprise oxygen, nitrogen, and argon by cryogenic distillation in a distillation system where the system is comprised of a distillation column that produces a nitrogen-enriched stream, an oxygen-enriched stream, and an argon-enriched stream, and a sidearm column which has a sump and receives the argon-enriched stream from the distillation column. During an interruption of flow of the argon-enriched stream into the sidearm column, the liquid inventory in the sidearm column is collected at a point above the sump and recirculated through the sidearm column during re-startup of the sidearm column.

摘要翻译： 一种在蒸馏系统中通过低温蒸馏分离包含氧，氮和氩的混合物的方法，其中该系统由产生富氮流的蒸馏塔，富氧流和富氩流组成， 以及具有贮槽并且接受来自蒸馏塔的富氩流的侧臂塔。 在富氩流进入侧臂塔的中断期间，侧臂塔中的液体库存被收集在贮槽上方的一个点处，并且在侧臂塔的再启动期间再循环通过侧臂塔。

公开(公告)号：US06006546A

公开(公告)日：1999-12-28

申请号：US69626

申请日：1998-04-29

申请人： David Miller Espie

发明人： David Miller Espie

IPC分类号： F25J3/04 ,  F25J1/00

CPC分类号： F25J3/04848 ,  F25J3/04412 ,  F25J3/0449 ,  F25J3/04545 ,  F25J3/04575 ,  F25J3/046 ,  F25J3/04606 ,  F25J2200/20 ,  F25J2245/42 ,  F25J2290/62

摘要： A cryogenic air separation system which is subject to periods of significant changes in product demand is controlled during such periods to minimize the impact of transient operation on product purity. A double-column distillation system is utilized in which a nitrogen-rich liquid is withdrawn from the higher-pressure column and introduced into the lower-pressure column as reflux. An inventory of this liquid is maintained in a holdup tank for storage or withdrawal during periods of transient operation. In addition, nitrogen vapor product from the lower-pressure column is recycled to the higher-pressure column, and the nitrogen vapor recycle rate is controlled as a function of the liquid level in the holdup tank. The flow rate of nitrogen-rich liquid withdrawn from the higher-pressure column is controlled as a function of its composition. The flow ratio of the nitrogen vapor recycle to the nitrogen-rich liquid reflux is controlled as a function of the composition of the nitrogen vapor withdrawn from the lower-pressure column. A feedforward control system increases the flow rate of the nitrogen-rich liquid withdrawn from the higher-pressure column during periods of increasing product demand and decreases the flow rate during periods of decreasing product demand.

摘要翻译： 受制于产品需求发生重大变化的低温空气分离系统在此期间进行控制，以尽量减少瞬态操作对产品纯度的影响。 使用双塔蒸馏系统，其中富氮液体从高压塔排出并作为回流引入低压塔。 在瞬时操作期间，将该液体的库存保持在储存罐中用于储存或取出。 另外，来自低压塔的氮气蒸气产物被再循环到高压塔中，并且氮气蒸气再循环速率作为保持罐中液面的函数被控制。 作为其组成的函数，控制从高压塔排出的富氮液体的流量。 根据从低压塔抽出的氮气蒸气的组成，控制氮蒸气与富氮液体回流的流动比。 前馈控制系统在增加产品需求期间增加从高压塔排出的富氮液体的流量，并在产品需求减少期间降低流量。