Rotary fluid bed used to gasify and combust oil-in water emulsions

A method of producing steam from the combustion of a oil-in-water emulsion in a rotary fluid bed gasifier comprising a rotatable drum having a circumferentially extending wall which is permeable to gases, a means for feeding a fluidizing gas through said wall into said drum, a bed of particles which, at least when said gasifier is in use, is supported on an internal face of said wall and is fluidized by said gas, an outlet means for receiving an oil-in-water emulsion from outside said gasifier and delivering said oil-in-water emulsion to said drum, a de-NO.sub.x boiler having a quench zone and a nitrogen fixing zone, a means for introducing secondary air disposed between said quench zone and said nitrogen fixing zone, and a means for introducing tertiary air disposed between said de-NO.sub.x boiler and a main boiler, comprising the steps of:

• introducing said fluidizing gas and a combustible gas into said drum wherein said bed particles are fluidized;
• igniting said combustible gas within said drum;
• heating said bed particles to approximately 1000.degree. F.;
• introducing an oil-in-water emulsion to said drum;
• removing said combustible gas;
• controlling the temperature within said drum to between about 1600.degree.-1800.degree. F. by adjusting the flow rate of said fluidizing gas, the speed of said drum, and the rate of introduction of said oil-in-water emulsion;
• and
• introducing said secondary air into said de-NO.sub.x boiler and said tertiary air between said de-NO.sub.x boiler and said main boiler.