Patent ID: 9266082
Filing Date: 2016-02-23
CPC Classification: B01J,C10G,F28D,F28F

Claim Text:
1. A cooling system for removing heat from a Fischer-Tropsch (F-T) slurry reactor, comprising: at least one downcomer having an upper portion and a lower portion; the at least one downcomer disposed within the F-T reactor to deliver a coolant downward through the F-T reactor, the at least one downcomer extending a length within the F-T reactor wherein the coolant is introduced into the upper portion of the at least one downcomer in a substantially liquid phase; a plenum connected to the lower portion of the at least one downcomer; the plenum being in fluid communication with the at least one downcomer wherein the coolant remains in the substantially liquid phase in the lower portioin of the at least one downcomer; at least one riser having a length and extending upward from the plenum; the at least one riser in fluid communication with the plenum wherein a portion of the coolant vaporizes as the coolant travels along the length of the at least one riser, and wherein the at least one downcomer, the plenum, and the at least one riser defining a flow path by which the coolant travels through the F-T reactor; and a restrictor having a first side, a second side, and an opening with a beta ratio in a range from 0.25 to 0.5, the restrictor positioned within the F-T reactor in a predetermined portion of the flow path to generate backpressure of the coolant on the first side of the restrictor to maintain the coolant on the first side of the restrictor in the substantially liquid phase and vaporize a portion of the coolant on the second side of the restrictor to provide a boiling heat transfer surface in the at least one riser.