Patent ID: 8961170
Filing Date: 2015-02-24
Classification: F23C,F23D,F23J,F23L

Abstract:
1. A waste gas purification system for a pulverized coal boiler comprising: a pulverized coal boiler, an air heater disposed downstream of the pulverized coal boiler for exchanging heat with a boiler waste gas to heat combustion air for use in the pulverized coal boiler, a dust removing unit disposed downstream of the air heater for removing ash in the boiler waste gas, a desulfurizing unit disposed downstream of the dust removing unit for removing sulfur oxides in the boiler waste gas, a catalyst unit for oxidizing a mercury gas provided between the pulverized coal boiler and the air heater or between the dust removing unit and the desulfurizing unit, and a halogen gas supply unit further provided downstream of the pulverized coal boiler and upstream of the catalyst unit, wherein the pulverized coal boiler comprises a furnace for burning pulverized coal, a burner for supplying pulverized coal and air used for combustion into the furnace so as to burn the pulverized coal in an insufficient air state, and an after-air port provided on a downstream side of the burner for supplying air used for perfect combustion, and wherein a ratio of a distance from the burner disposed on an uppermost stage of the furnace to a main after-air port to a height from a bottom of the furnace to a nose is 20% to 30%.