CONTROLLED FREEZE ZONE TOWER

摘要

A cryogenic distillation tower is provided for the separation of a fluid stream containing at least methane and carbon dioxide. The cryogenic distill ation tower has a lower stripping section, an upper rectification section, a nd an intermediate spray section. The intermediate spray section includes a plurality of spray nozzles that inject a liquid freeze zone stream. The nozz les are configured such that substantial liquid coverage is provided across the inner diameter of the intermediate spray section. The liquid freeze zone stream generally includes methane at a temperature and pressure whereby bot h solid carbon dioxide particles and a methane-enriched vapor stream are for med. The tower may further include one or more baffles below the nozzles to create frictional resistance to the gravitational flow of the liquid freeze zone stream. This aids in the breakout and recovery of methane gas. Addition al internal components are provided to improve heat transfer and to facilita te the breakout of methane gas.