Vessel, system, and process for minimizing unequal flow distribution
One exemplary embodiment can be a pressure swing adsorber vessel. The pressure swing adsorber vessel can include one or more walls. Generally, the one or more walls contain an adsorbent bed having a first side and a second side and at least one spacer forming a cusp. Usually, the one or more walls and the adsorbent bed define at least one void volume adjacent to the adsorbent bed, and the cusp of the at least one spacer may be positioned in the at least one void volume. The cusp can be positioned opposing an incoming feed stream or a desorbent stream.
1. A pressure swing adsorber vessel, comprising:
A) one or more walls containing:
1) an adsorbent bed having a first side and a second side, and the one or more walls and the adsorbent bed defining at least one void volume adjacent to the adsorbent bed; and
2) at least one spacer forming a cusp positioned in the at least one void volume wherein the cusp is positioned opposing an incoming feed stream or a desorbent stream, wherein the one or more walls and the adsorbent bed form a first void volume and a second void volume wherein each void volume is formed at respective ends of the pressure swing adsorber vessel and wherein the at least one spacer comprises a first spacer positioned within the first void volume and a second spacer positioned within the second void volume.
2. The pressure swing adsorber vessel according to claim 1 , wherein a cusp of the first spacer is positioned opposing an incoming feed stream and a cusp of the second spacer is positioned opposing an incoming desorbent stream.
3. The pressure swing adsorber vessel according to claim 1 , wherein the at least one spacer has at least a part forming a substantial cone-shape and wherein the at least one spacer comprises a first part, in turn comprising the substantial cone-shape, nested with a second part comprising an inverted funnel.
4. The pressure swing adsorber vessel according to claim 1 , wherein the adsorbent bed comprises at least one molecular sieve.
5. A process for minimizing unequal flow distribution in a pressure swing adsorption system, comprising:
positioning at least one spacer in a void volume of an adsorber vessel wherein the spacer forms a channel having a substantially constant cross-sectional area in a direction of a fluid flow wherein the at least one spacer comprises a deflector nested with a diffuser.
6. The process according to claim 5 , wherein the deflector comprises a substantial cone-shape having a concave surface and the diffuser comprises an inverted funnel.
7. The process according to claim 6 , wherein a feed stream is provided to the adsorber vessel during an adsorption cycle at one end and a desorbent stream is provided to the adsorber vessel during a desorption cycle at an opposing end of the adsorber vessel.
8. The process according to claim 7 , wherein the at least one spacer comprises first and second spacers, wherein each spacer has a respective cusp, and the cusp of the first spacer is positioned opposing an incoming feed stream and the cusp of the second spacer is positioned opposing an incoming desorbent stream.
9. The process according to claim 8 , wherein the pressure swing adsorption system comprises a plurality of adsorber vessels operating in offsetting adsorption and desorption cycles.
10. A pressure swing adsorption system, comprising:
A) a first vessel comprising one or more walls, wherein the first vessel contains:
1) an adsorbent bed having a first side and a second side, and the one or more walls and adsorbent bed define at least one void volume adjacent to the adsorbent bed; and
2) at least one spacer comprising at least one part forming a hemi-pseudosphere; and
B) a second vessel containing at least one adsorbent bed.
11. The pressure swing adsorption system according to claim 10 , wherein the at least one spacer comprises a first part, in turn comprising a substantial cone-shape, and the second part comprising the hemi-pseudosphere.
12. The pressure swing adsorption system according to claim 10 , wherein the one or more walls of the first vessel and the adsorbent bed define a first void volume and a second void volume wherein each void volume is formed at respective ends of the first vessel.
13. The pressure swing adsorption system according to claim 12 , wherein the at least one spacer comprises a first spacer positioned within the first void volume and a second spacer positioned within the second void volume.
14. The pressure swing adsorption system according to claim 10 , wherein the second vessel comprises one or more walls, and the one or more walls and the adsorbent bed form first and second void volumes wherein each void volume is formed at respective ends of the second vessel.
15. The pressure swing adsorption system according to claim 14 , wherein the second vessel contains a first spacer positioned within the first void volume and a second spacer positioned within the second void volume.
16. The pressure swing adsorption system according to claim 11 , wherein the first part is nested with the second part.