Casale's sour CO-shift converter features our well-proven, reliable axial-radial flow internals. With this kind of arrangement, most of the gas passes through the catalyst bed in the radial direction, resulting in very low pressure drop. The balance passes down through a top layer of catalyst in an axial direction, thus eliminating the need for a complicated, gas sealed top cover on the catalyst basket.
The low pressure drop of an axial-radial converter allows to design slimmer and thinner pressure vessels than a traditional axial-flow converter. This feature results in a significant capital cost saving, especially for the first shift converter.
The hot reacted gas at the exit of the catalyst bed is always collected at the centre of the converter and leave it trough a nozzle in the bottom dished end, which therefore is the only “hot spot” in the whole construction, making the Casale sour shift converter particularly cheaper, robust and reliable. Conversely, with a traditional axial-flow sour shift converter the entire pressure vessel must be designed to withstand the hot spot temperature.