IN THIS SECTION:
Johnson Matthey engineers and manufactures catalytic heat-exchanging materials in a wide range of geometries, forms, and capabilities — each custom developed for specific customer needs. The following are some examples.
Shapes – Coated foils can be supplied in virtually any shape.
- Cylinders and annular constructs are common.
- Rectangles and cubic or planar forms have been used in many applications.
- Less common but still possible are rhombic, trapezoidal, or tapered forms.
- Pie and disc shapes available.
- Geometric combinations of all shapes are also possible.
Corrugations and fins – Flat foils to complex forms.
- Straight, herringbone, and skew corrugations from 20 to 2000 cpsi
- Triangular or rectangular formed fins, with straight or complex profiles in the flow direction.
- Fins from 5 to 50 fins per inch, at heights 0.01 to 1”.
- Interrupted, serrated, or punched forms that promote mixing or heat transfer.
Graded constructions – We can produce structures that contain several distinct gradations. Certain applications require that the foil geometry within a construct vary along the flow length. Some catalytic combustors use such a feature to manage heat transfer or reaction rate. Such phase changes can be accomplished in graded structures.
Selective coatings – Coatings can be strategically placed in bands, ribbons, or spots within a structure to control reaction rate of flashback characteristics.