Abstract: The present invention relates to a method for the noncatalytic reduction of NO.sub.x in combustion gases which method includes maintaining an excess of fuel to air during combustion, cooling the combustion gases to between 2400.degree. F. and 3000.degree. F., and injecting into the cooled gases ammonia in a ratio 1:1 to 1:4 NO.sub.x to NH.sub.3. After the ammonia has been injected to reduce the NO.sub.x, the gas is further cooled to between 1900.degree. F. and 2300.degree. F. and secondary air injected into the gases to complete combustion of the fuel.

Abstract: Method and apparatus for continuously freezing and melting a fluid mixture, for use in separating a fluid mixture into dilute and concentrated components which have been made separble due to the freezing. A turbine is used to produce mechanical energy to drive a refrigeration compressor, while exhaust heat from the turbine is used for secondary cooling. Heat from a refrigeration condenser is used to melt the liquid frozen by a refrigerant evaporator. The evaporator and condenser may comprise a plurality of plates or may comprise a bubbler for bubbling refrigerant directly into contact with the fluid mixture.