BOOSTER AIR HEATER FOR HIGH MOISTURE FUELS

摘要

A system for drying pulverized high moisture fuel for use in a selective catalytic reduction system equipped combustion system is provided. The combustion system includes a mill for pulverizing fuel, an air heater, two fuel gas streams at different temperatures, a booster air heater and a fuel duct for feeding dried pulverized fuel to a combustion furnace.

主权项

1. A selective catalytic reduction system equipped combustion system fueled by high moisture fuel comprising:
a mill for pulverizing high moisture fuel to obtain pulverized fuel; an interior chamber; an air heater operable to heat primary air to an increased temperature using a first flue gas stream and a second flue gas stream, the second flue gas stream being a portion of the flue gas exiting the interior chamber of the combustion system prior to passing through a heat exchanger and being a higher temperature than the first flue gas stream; a booster air heater operable to heat primary air of an increased temperature to a higher temperature using the second flue gas stream; and a fuel duct for passage of higher temperature primary air through the mill to dry the pulverized fuel and to carry the dry pulverized fuel from a mill outlet to a combustion furnace.