Diffuser assemblies and catalytic reactors comprising the same
Briefly, in one aspect, a catalytic assembly described herein comprises a module comprising at least one layer of structural catalyst bodies having an inlet face for receiving a gas stream. A diffuser assembly is arranged a distance of greater than 50 mm from the inlet face, the diffuser assembly including at least one diffuser element comprising a plurality of apertures, wherein a ratio of aperture length (L) in the gas stream flow direction to aperture hydraulic diameter (D a ) is less than 1.
1. A catalytic assembly comprising:
a module comprising at least one layer of structural catalyst bodies, the layer having an inlet face for receiving a gas stream; and
a diffuser assembly arranged a distance of greater than 50 mm from the inlet face, the diffuser assembly including a plurality of diffuser elements vertically integrated in the diffuser assembly, the diffuser elements comprising a plurality of apertures, the apertures of two or more diffuser elements being radially offset and/or laterally offset,
wherein a ratio of aperture length (L) in the gas stream flow direction to aperture hydraulic diameter (D a ) is less than 1.
2. The catalytic assembly of claim 1 , wherein the distance from the diffuser assembly to the inlet face is at least 75 mm.
3. The catalytic assembly of claim 1 , wherein the distance from the diffuser assembly to the inlet face is at least 100 mm.
4. The catalytic assembly of claim 1 , wherein the distance from the diffuser assembly to the inlet face is 75-200 mm.
5. The catalytic assembly of claim 1 , wherein L/D a <0.5.
6. The catalytic assembly of claim 1 , wherein the aperture hydraulic diameter (D a ) is greater than flow channel hydraulic diameter of the structural catalyst bodies.
7. The catalytic assembly of claim 1 , wherein the aperture hydraulic diameter (D a ) is greater than 7 mm.
8. The catalytic assembly of claim 1 , wherein the aperture hydraulic diameter (D a ) is greater than 9 mm.
9. The catalytic assembly of claim 1 , the apertures are polygonal.
10. The catalytic assembly of claim 1 , wherein the apertures are circular or elliptical.
11. The catalytic assembly of claim 1 , wherein the aperture hydraulic diameter (D a ) is uniform.
12. The catalytic assembly of claim 1 , wherein the aperture hydraulic diameter (D a ) varies over the diffuser element face.
13. The catalytic assembly of claim 1 , wherein the apertures of the diffuser element are formed by intersecting wires.
14. The catalytic assembly of claim 13 , wherein the wires have circular or elliptical cross-sectional geometry.
15. The catalytic assembly of claim 13 , wherein the wires have polygonal cross-sectional geometry.
16. The catalytic assembly of claim 1 , wherein the diffuser element has an open frontal area of 30-70 percent.
17. The catalytic assembly of claim 1 , wherein the apertures are radially offset by 5-90 degrees.
18. The catalytic assembly of claim 1 , wherein aperture hydraulic diameter (D a ) is uniform between the vertically integrated diffuser elements.
19. A catalytic assembly comprising:
a module comprising at least one layer of structural catalyst bodies, the layer having an inlet face for receiving a gas stream; and
a diffuser assembly arranged a distance of greater than 50 mm from the inlet face, the diffuser assembly including a plurality of diffuser elements vertically integrated in the diffuser assembly, the diffuser elements comprising a plurality of apertures,
wherein a ratio of aperture length (L) in the gas stream flow direction to aperture hydraulic diameter (D a ) is less than 1 and aperture hydraulic diameter (D a ) varies between the vertically integrated diffuser elements.