초록 ▼

A transport type fluid catalytic cracking reactor comprising a riser conduit, a flow reversal means and a downcomer conduit, wherein the flow reversal means has a closable top such that a shorter or longer residence time of catalyst and oil vapor in the transport reactor may be selected without affe

A transport type fluid catalytic cracking reactor comprising a riser conduit, a flow reversal means and a downcomer conduit, wherein the flow reversal means has a closable top such that a shorter or longer residence time of catalyst and oil vapor in the transport reactor may be selected without affecting vapor velocity within the riser conduit.

대표청구항 ▼

In a fluidized catalytic cracking vessel comprising an enclosed, vertical shell defining a lower zone for a dense phase fluidized catalyst bed and an upper zone for separation and recovery of hydrocarbon vapors, an elongated riser conduit extending vertically into the lower portion of said reactor v

In a fluidized catalytic cracking vessel comprising an enclosed, vertical shell defining a lower zone for a dense phase fluidized catalyst bed and an upper zone for separation and recovery of hydrocarbon vapors, an elongated riser conduit extending vertically into the lower portion of said reactor vessel forming an upwardly directed confined cracking path, an elongated downcomer, open at each end, vertically disposed around the upper portion of said elongated riser conduit foRming a downwardly directed annular cracking path communicating at the lower end with the interior of said reactor vessel, and flow reversal means communicating with the interior of said riser conduit and the annular space between said riser conduit and said downcomer at the upper end thereof; the improvement which comprises: a. valve means, having full open and full closed positions coaxial with the upper end of said riser conduit and communicating between the flow reveral means and the reactor vessel for selectively lengthening and shortening the confined cracking path; b. means for reducing erosion of said valve means by impinging catalyst comprising a nipple having a diameter at least equal to the diameter of said riser conduit and having a height at least equal to one-fourth its diameter, said nipple being coaxial with the riser conduit outlet and attached to the top of said flow reversal means and the bottom of said valve means; and c. dense phase fluidized catalyst bed level adjusting means for selectively covering and uncovering said downcomer outlet with accumulated dense phase fluidized catalytic cracking catalyst.