Flow control units are designed to control the flow of Ammonia from the Ammonia storage/forwarding system into an air or fuel gas stream. The air is typically pressurized and heated with an electric process heater or low pressure steam. The hot air of fuel gas is available from gas turbine exhaust. The hot air or fuel gas vaporizes the ammonia prior to injection into the Ammonia Injection Grid (AIG). Generally flow control units are used in Power and Process industries.