FUEL - AIR RATIO CONTROL IN CHP PLANT BOILER UNITS AT FORCED FLOW FAN PERFORMANCE REGULATION BY THROTTLING
A mathematical model of the fuel - air ratio control system for a boiler unit (BU) operating on solid fuel is developed. The reasonability to control the oxygen - flue gases ratio instead of the fuel - air ratio is shown under the change in the boiler unit load. A direct dependence between these two indices is demonstrated. It is preserved both under the changes in BU load and in the temperature and pressure of the atmospheric air. Transition to the volume percent of oxygen in the flue gases can be used for a possible search for BU extremum efficiency.