Refractory Erosion Problem in Sulphur Condenser

Hi,

I am looking after the Maintenance of Sulphur Recovery Unit in a large refinery. We have Sulphur Condensers installed which have refractory linings inside the Channel Heads for protection against Sulphur, H₂S or any other corrosive service. The Operating Temperature is merely 350 Degree C. Refractory lining is getting deteriorated after 4-6 months of operation in this service which is further choking the exchanger tubes and the piping system in the network. Though various grades of refractory have been applied earlier, the erosion problem is not yet resolved. We intend to remove this refractory lining and put up a Paint Protection Layer over the existing Carbon Steel shell.

Can anyone provide a solution in this regard or any of products suitable for such service?