| 摘要 |
A process and apparatus for contacting a fluid with the walls of a vessel are characterised by flow of the fluid alternatingly (a) through a structure within the vessel and having passages angled to the general direction of flow in the vessel and (b) through a space between the structure and the vessel walls. The structure can be for example a cross flow ceramic or metal honeycomb or a stack of profiled plates or of apertured plates such as expanded metal. The structure can carry a catalytic coating and then affords high activity and low pressure drop. The process and apparatus are especially suitable for endothermic tubular steam hydrocarbon reforming. According to figure 1 a cylindrical vessel has, separated from its inner walls by annular-section space 12, a structure consisting of elliptical flat plates 14 alternating with elliptical corrugated plates 16, all mutually parallel and set at an angle of 30.degree. to the general fluid flow direction. The relative pressure drops through the passages and through space 12 are adjusted so that fluid flows through the passages between the flat plates and corrugated plates and then, on emerging from those passages, through the space 12 in contact with the vessel walls until it encounters the opening of further passages. |
