An integrated primary and secondary cyclone assembly, comprising: a secondary cyclone having an outlet tube extending therefrom, the outlet tube having a cross dimension and length, the outlet tube configured to be secured to a pressure vessel closure head to support the secondary cyclone therefrom; a primary cyclone operatively coupled with the secondary cyclone, the primary cyclone having a tubular support member extending therefrom, the tubular support member aligned substantially parallel with and having a cross dimension and a length similar to the cross dimension and, respectively, the length of the outlet tube of the secondary cyclone and configured to be joined to the pressure vessel closure head to support the primary cyclone therefrom, wherein the tubular support member has a central axis aligned along a concentric axis of a centroid of the primary cyclone; characterized in that the integrated primary and secondary cyclone assembly further comprises: an integrated cyclone stabilizer free of attachment to neighboring cyclone assemblies or to a shell of the pressure vessel, wherein the integrated cyclone stabilizer comprises multiple subassemblies (700, 1100), each subassembly (700, 1100) comprising an upper annular ring to be disposed at an upper portion of the cyclone (100, 200), the upper annular ring having a plurality of hinge members extending radially therein to support the upper portion of the cyclone therefrom; a lower annular ring to be disposed at a lower portion of the cyclone (100, 200), the lower annular ring having a plurality of hinge members extending radially therein to support the lower portion of the cyclone therefrom; and a plurality of struts extending between the upper annular ring and the lower annular ring; and wherein the subassemblies (700, 1100) are joined together by one or more connecting members. a secondary cyclone having an outlet tube extending therefrom, the outlet tube having a cross dimension and length, the outlet tube configured to be secured to a pressure vessel closure head to support the secondary cyclone therefrom; a primary cyclone operatively coupled with the secondary cyclone, the primary cyclone having a tubular support member extending therefrom, the tubular support member aligned substantially parallel with and having a cross dimension and a length similar to the cross dimension and, respectively, the length of the outlet tube of the secondary cyclone and configured to be joined to the pressure vessel closure head to support the primary cyclone therefrom, wherein the tubular support member has a central axis aligned along a concentric axis of a centroid of the primary cyclone; an integrated cyclone stabilizer free of attachment to neighboring cyclone assemblies or to a shell of the pressure vessel, wherein the integrated cyclone stabilizer comprises multiple subassemblies (700, 1100), each subassembly (700, 1100) comprising an upper annular ring to be disposed at an upper portion of the cyclone (100, 200), the upper annular ring having a plurality of hinge members extending radially therein to support the upper portion of the cyclone therefrom; a lower annular ring to be disposed at a lower portion of the cyclone (100, 200), the lower annular ring having a plurality of hinge members extending radially therein to support the lower portion of the cyclone therefrom; and a plurality of struts extending between the upper annular ring and the lower annular ring; and wherein the subassemblies (700, 1100) are joined together by one or more connecting members.