Coal fired furnace light-off and stabilization using microfine pulverized coal

摘要

A method for the cold start of a pulverized coal-fired furnace (10) without prior warm-up of the furnace wherein a supply of microfine pulverized coal (64) supplied from a micropulverizer (60) is combusted to generate a hot gas which is passed to a load-carrying mill (20) as the drying media for the coal pulverized therein. Pulverized coal entrained in the hot gas passes from the load-carrying mill to the load-carrying burner (18) of the furnace (10) and is ignited therein to produce a warm-up flame. A portion of the microfine pulverized coal (68) may also be admixed with the pulverized coal from the load carrying mill (20) to enhance the reactivity thereof. An additional portion (66) of the microfine pulverized coal may be used to fire a pilot igniter to ignite the pulverized coal supplied to the load-carrying burners (18) from the load-carrying mill (20).