Abstract: Disclosed herein is a control system for NOx reduction in a power plant, the control system comprising a model predictive controller; a proportional integral differential controller and/or an adaptive controller; where the proportional integral differential controller and/or an adaptive controller are subordinated to and in operative communication with the model predictive controller; where the proportional integral differential controller and/or an adaptive controller comprise a feedback loop; a NOx reduction system comprising a NOx reducing agent supply tank and a water supply tank; and a furnace for combusting a fuel; where the furnace lies downstream of the NOx reduction system and where the furnace is provided with a plurality of nozzles that are in fluid communication with the NOx reduction system; where the control system is in electrical communication with the NOx reduction system.

Abstract: A grate assembly for a fluidized bed reactor includes a plurality of parallel air ducts extending side-by-side in a substantially horizontal plane and defining spaces therebetween through which coarse material from the fluidized bed descends. A plurality of nozzle assemblies is attached to each air duct for supplying fluidizing air from within the air duct into the fluidized bed. Each of the nozzle assemblies includes a nozzle formed from a tube having an inlet end in fluid communication with the air duct, and an outlet end in fluid communication with the inlet end. An orifice is disposed at the outlet end of the nozzle, and the nozzle is bent proximate the outlet end to direct a primary direction of a stream of fluidizing air flowing from the orifice toward the air duct such that an angle ? between the primary direction and the substantially horizontal plane formed by the air ducts is between about 30 to about 90 degrees.

Abstract: A grate assembly for a fluidized bed reactor includes a plurality of parallel air ducts extending side-by-side in a substantially horizontal plane and defining spaces therebetween through which coarse material from the fluidized bed descends. A plurality of nozzle assemblies is attached to each air duct for supplying fluidizing air from within the air duct into the fluidized bed. Each of the nozzle assemblies includes a nozzle formed from a tube having an inlet end in fluid communication with the air duct, and an outlet end in fluid communication with the inlet end. An orifice is disposed at the outlet end of the nozzle, and the nozzle is bent proximate the outlet end to direct a primary direction of a stream of fluidizing air flowing from the orifice toward the air duct such that an angle ? between the primary direction and the substantially horizontal plane formed by the air ducts is between about 30 to about 90 degrees.