Fluid distribution in a fluidized bed reactor

A fluidized bed reactor having a fluid distribution cap comprising

• a tunnel shaped structure having two opposing walls for attaching to a fluid distribution plate;
• and
• at least one opening at an end of the tunnel shaped structure, wherein the tunnel shaped structure has two openings at opposing ends of the structure;
• the tunnel shaped structure having an inner surface and an outer surface, wherein the inner surface has a curved cross section, and wherein the outer surface has a substantially V-shaped cross section;
• or
• having a fluid distribution plate comprising a plate having a plurality of fluid vent holes;
• a plurality of the fluid distribution caps, wherein
• for each fluid vent hole a fluid distribution cap is mounted over said hole;
• wherein at least two mutually neighboring fluid distribution caps are positioned with an opening of a first of the two neighboring fluid distribution caps facing a side of the second of the two neighboring fluid distribution caps.

A polymerization process, comprising

• performing the process of polymerization with a fluid distribution cap comprising a tunnel shaped structure having two opposing walls for attaching to a fluid distribution plate;
• and at least one opening at an end of the tunnel shaped structure, wherein the tunnel shaped structure has two openings at opposing ends of the structure;
• the tunnel shaped structure having an inner surface and an outer surface, wherein the inner surface has a curved cross section, and wherein the outer surface has a substantially V-shaped cross section;
• or
• performing the process of polymerization with a fluid distribution plate comprising a plate having a plurality of fluid vent holes;
• a plurality of the fluid distribution caps, wherein, for each fluid vent hole a fluid distribution cap is mounted over said hole;
• wherein, at least two mutually neighboring fluid distribution caps are positioned with an opening of a first of the two neighboring fluid distribution caps facing a side of the second of the two neighboring fluid distribution caps.