Influence of the coal feed rate on lean coal ignition in a full-scale tiny-oil ignition burner

A tiny-oil ignition burner was proposed to reduce oil consumption in firing up and partial-load operation. To investigate the influence of the feed rate on lean coal ignition in the tiny-oil ignition burner, full-scale reacting-flow experiments were performed using an experimental setup. The ignition burner was identical to the burner used in an 800 MWe utility boiler. As coal feed rates increased from 1 to 5 t/h, the gas temperatures at equivalent measuring points at the exits of the first and second combustion chambers and on the burner center line decreased gradually.O₂ concentrations at the exit of the burner were 1.79-7.18%. Increasing the coal feed rate decreased coal burnout and the release rates for C and H at equivalent points at the exits.