Cyclonic reactor vessel having a low residence time plenum

A cyclonic reactor vessel according to the present invention comprising:

• a shell;
• a primary cyclonic separation device disposed within the shell and having an outlet;
• a plurality of secondary cyclones, said secondary cyclones being disposed within the shell, and each of said secondary cyclones having a body, an inlet and an outlet;
• wherein the outlet of the primary cyclonic separation device is connected to the inlet of at least one secondary cyclone such that a fluid stream may flow from the outlet of the primary cyclonic separation device into the inlet of the at least one secondary cyclone;
• a first plenum having a skirt and a floor forming a sealed annular chamber within the shell, wherein the first plenum is supported within the shell by attachment to the shell;
• a second plenum having an outlet tube for removing gasses from within the shell, a skirt and a floor and having a smaller volume than a volume of the first plenum;
• and
• a secondary cyclone support system comprising at least one mechanism selected from the group consisting of:
• (a) attachment of the outlet tube of each secondary cyclone to the skirt and/or floor of the first plenum and (b) a first set of hanger straps extending from the first plenum skirt and/or first plenum floor and/or secondary cyclone outlet pipe to the body of each secondary cyclone, wherein the first set of hanger straps are substantially vertically placed within the shell;
• and
• wherein the outlets of the plurality of secondary cyclones are fluidly connected to the second plenum.