PROTECTION AGAINST CORROSION OF TUBE OUTLET ENDS IN CATALYTIC CRACKING HEATER: GAS FREE OF CO SUPPLIED TO OUTSIDE OF TUBE ENDS

摘要

The tube furnace has numerous catalyst-containing tubes located in a fire space. Synthesis gas containing primarily hydrogen, carbon monoxide and carbon dioxide is generated in the tubes. At the outsides of the discharge ends of the tubes, there is the danger of carbide formation (metal dusting corrosion). To prevent this, a largely CO-free, gaseous or vapour-form protective medium is supplied to the exterior region of the discharge ends of the tubes. IMAGE