Unitized Chiller

KBR Unitized Chiller as installed at an ammonia plant in Trinidad Click to Enlarge

The unitized chiller is a specially designed, multi-stream heat exchanger that cools the effluent from the ammonia synthesis converter with recycled gas and boiling ammonia refrigerant at several temperature levels. In doing so, the unitized chiller combines several heat exchangers, compressor knockout drums and interconnecting piping into one piece of equipment. This design saves pressure drop in the synthesis loop and reduces capital cost of ammonia manufacturing.