[특허]Modular compact adsorption bed

Praxair Technology, Inc.

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특허 상세정보

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Modular compact adsorption bed

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B01D-053/02
미국특허분류(USC)	095/096; 096/130
출원번호	US-0646157 (2009-12-23)
등록번호	US-8268043 (2012-09-18)
발명자 / 주소	Celik, Cem E. Ackley, Mark William Smolarek, James
출원인 / 주소	Praxair Technology, Inc.
대리인 / 주소	Pace, Salvatore P.
인용정보	피인용 횟수 : 28 인용 특허 : 9

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A modular and compact adsorbent bed structure is disclosed for use in an adsorption-based gas separation plant. The conventional adsorbent bed in a gas separation plant is replaced with a plurality of modular adsorbent bed units connected to make the adsorbent bed structure. Modular adsorbent bed units of this invention provide higher capacity of product per unit volume of adsorbent material (i.e., increased adsorbent utilization) as compared to that obtained from conventional adsorbent beds. The modular design requires lower fabrication costs; is easier...

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1. A adsorption bed structure used in cyclic adsorption processes comprised of: a) an enclosed housing with inlet means and outlet means,b) a plurality of a modular compact adsorbent bed units within the housing, each of the units comprised of two substantially parallel opposing gas permeable faces enclosed within perimeter side walls connected to the faces and wherein the distance between the modular adsorbent bed units is equal to or less than half of the modular adsorbent bed unit depth,c) adsorbent material densely packed within the units and having an inter-particle void fraction of less than 40%,d) a feed channel adjacent to one face of each of the units;e) a product channel adjacent to the opposing face of each of the units; and wherein a product gas flows into the housing through the inlet means through the adsorbent bed units and exits the adsorbent bed units through the product channel to the outlet means, andwherein the distance between the adsorbent bed units containing the feed channel and the product channels is equal to or less than half of the bed depth and the void volume ratio of the bed is less than 30%. 2. The structure of claim 1 wherein the feed channel is tapered, having a wider end where the gas enters the feed channel, and the product channel is tapered, having a wider end where the gas exits the product channel, and wherein the feed channel and the product channel are symmetric. 3. The structure of claim 1 wherein the product channel is narrower than the feed channel. 4. The structure of claim 2 wherein the product channel is narrower than the feed channel. 5. The structure of claim 1 wherein the surface area of one face is greater than the total area of the side walls. 6. The structure of claim 1 wherein the volume of outlet means is less than 25 percent of the volume of the inlet means. 7. The structure of claim 1 wherein the distance between the adsorbent bed units is one half of the bed depth or less. 8. An adsorption bed structure for use in an adsorption-based gas separation process comprised of: a) a box shaped adsorbent bed housing having a feed inlet on one side of the housing and a product outlet on the opposing side of the housing and having a plurality of receiving slots positioned within the housing in substantially parallel sequence;b) a plurality of modular adsorbent bed units within the receiving slots, each modular adsorbent bed unit comprised of two parallel opposing gas permeable faces enclosed within perpendicularly positioned non-gas permeable side walls sealing the perimeter of the faces; andc) an adsorbent material densely packed within the faces and the side walls;wherein the feed inlet leads to a feed manifold in communication with feed flow channels proximate to one face of the modular adsorbent bed units and a product flow channel in communication with the product manifold proximate to the other face of the modular adsorbent bed units and the product manifold leads to the product outlet, and wherein the adsorbent bed structure has a total void volume ratio of less than 30%. 9. The adsorbent bed structure of claim 8 wherein a channel dividing wall is positioned between the feed channels and the product channels. 10. The adsorbent bed structure of claim 9 wherein a channel dividing wall is positioned between the modular adsorbent bed units creating the feed channel on one side of the channel dividing wall and the product channel on the other side of the channel dividing wall. 11. The adsorbent bed structure of claim 10 wherein the feed channel is tapered, having a wider end where the gas enters the feed channel, and the product channel is tapered, having a wider end where the gas exits the product channel, and wherein the feed channel and the product channel are symmetric. 12. The adsorbent bed structure of claim 8 wherein and the frontal area of each face of each of the modular units is greater than the total area of the side walls. 13. The adsorbent bed structure of claim 8 used in a cyclic PSA, VSA or VPSA process. 14. A cyclic adsorption-based gas separation process for removing at least one absorbable gas component from a multi-component feed gas comprising passing the feed gas through an adsorbent bed structure comprising: a) a plurality of modular compact adsorbent bed units, each modular unit having two opposing gas permeable faces enclosed within four non-permeable side walls around the perimeter of the faces,b) adsorbent material densely packed and having an inter-particle void fraction of less than 40% retained within the faces and the side walls,c) feed channels proximate to one face of modular adsorbent bed unit and a product channel proximate to the opposing face of the same modular adsorbent bed unit,d) a housing having a feed inlet to receive feed gas, a feed manifold to distribute the feed gas to the product channel and a product manifold and a product outlet to receive the product gas from the product channel, andwherein the housing encloses the plurality of modular adsorbent units, the feed channel, the product channel, the inlet manifold and the product manifold and the total void volume ratio is less than 30%. 15. The gas separation process of claim 14 wherein the modular adsorbent bed units are positioned in substantially parallel sequence and the feed gas moves axially through each of the modular adsorbent bed units. 16. The process of claim 15 wherein the distance between the adsorbent bed units is one half of the bed depth or less. 17. The gas separation process of claim 14 wherein the process is a PSA, VSA, or VPSA process operating at a fast cycle. 18. The gas separation process of claim 17 wherein the process is the separation of air to produce oxygen. 19. The gas separation process of claim 14 with a cycle time is less than 30 seconds. 20. An adsorption bed structure for use in a cyclic adsorption-based gas separation process comprising: a) a plurality of modular compact adsorbent bed units spaced apart from and located generally parallel to one another;b) each of the modular adsorbent bed units having two opposed faces in which process streams are introduced into and discharged from the units when the adsorption bed structure is subjected to an cyclic adsorption process;c) a plurality of flow channels comprising a first set of flow channels, each in communication with one of the two opposed faces of each of the modular adsorbent bed units and a second set of channels each in communication with the opposite side of the two opposed faces of each of the modular adsorbent bed units such that the first set of flow channels introduce process gas streams into the modular adsorbent bed units on one side of the two opposed faces and the second set of flow channels collect the process gas streams from the opposed face of the two opposed faces of the modular adsorbent bed units and wherein the distance between two adsorbent beds units is equal to or less then the distance of the bed length;d) the plurality of flow channels and the modular adsorbent bed units aligned in serial arrangement such that the plurality of flow channels are located between the modular adsorbent bed units and at opposite ends of the serial arrangement; ande) first and second manifolds in communication with the first set of flow channels and the second set of flow channels, respectively, to introduce the gas process streams into the first set of flow channels and withdraw the process gas streams from and the second set of flow channels on opposing sides of the modular adsorbent bed units;wherein the first set of flow channels are tapered, having a wider end where the gas enters the first set of channels, and the second set of flow channels are tapered, having a wider end where the gas exits the second set of channels, and wherein the first and second set of flow channels are symmetric. 21. The adsorbent bed structure of claim 20, wherein the system further comprises void spaces and the void spaces contain inert filler material. 22. The adsorbent bed structure of claim 20, wherein there are at least two adsorbent bed units and the system further comprises a separator between the feed channels and the product channels. 23. The adsorbent bed structure of claim 20, wherein the opposing faces of the at least one adsorbent bed are perforated plates with mesh wire or cloth screens. 24. An adsorption bed structure for use in a cyclic adsorption-based gas separation process comprising: a) a plurality of modular compact adsorbent bed units spaced apart from and located generally parallel to one another;b) each of the modular adsorbent bed units having two opposed faces in which process streams are introduced into and discharged from the units when the adsorption bed structure is subjected to an cyclic adsorption process;c) a plurality of flow channels comprising a first set of flow channels, each in communication with one of the two opposed faces of each of the modular adsorbent bed units and a second set of channels each in communication with the opposite side of the two opposed faces of each of the modular adsorbent bed units such that the first set of flow channels introduce process gas streams into the modular adsorbent bed units on one side of the two opposed faces and the second set of flow channels collect the process gas streams from the opposed face of the two opposed faces of the modular adsorbent bed units and wherein the distance between two adsorbent beds units is equal to or less then the distance of the bed length;d) the plurality of flow channels and the modular adsorbent bed units aligned in serial arrangement such that the plurality of flow channels are located between the modular adsorbent bed units and at opposite ends of the serial arrangement; ande) first and second manifolds in communication with the first set of flow channels and the second set of flow channels, respectively, to introduce the gas process streams into the first set of flow channels and withdraw the process gas streams from and the second set of flow channels on opposing sides of the modular adsorbent bed units; andwherein the second set of flow channels are narrower than the first set of feed channels.

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Modular compact adsorption bed

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