Patent ID: 7865271

Claim:
A system for reducing fouling and improving efficiency in a coal-fired power plant, comprising: an analyzer grid, the analyzer grid comprising a plurality of sensors that measure gas characteristics through an approximate cross-section of a flow through a boiler of the coal-fired power plant; a plurality of air injectors with enhanced controllability; means for analyzing the measurements of the gas characteristics; and means for controlling the air injectors with enhanced controllability; wherein the air injectors with enhanced controllability each comprises an air injector with yaw control; wherein the air injectors with enhanced controllability comprise two of the air injectors within a separated overfire air injector port level and two of the air injectors within a close-coupled overfire air injector port level; and wherein the air injectors of the separated overfire air injector port level and the close-coupled overfire air injector port level are located at the corners of a substantially rectangular furnace, and the two air injectors with enhanced controllability within each of the port levels comprise the air injectors positioned on opposite corners of the rectangle.