Closure means

摘要

A pressure vessel base closure means including a pair of flat disc-like members spaced apart by a peripheral outer cylindrical member and an inner perforated cylindrical member, and there being provided between the two flat disc-like members a plurality of radially directed ribs to provide rigidity to the base closure means. The base closure means is particularly useful for a reactor in which a bed of fluidized solid is maintained by the passage of a gas into the reactor through the base via the chamber between the two flat disc-like members.