Patent ID: 8840843

Claim:
An air pollution control apparatus including at least one denitration catalyst layer for reducing an amount of a nitrogen oxide in flue gas from a boiler and oxidizing mercury with hydrogen chloride sprayed into the flue gas, the air pollution control apparatus comprising: a gas diffusion facilitating unit, the hydrogen chloride being supplied to a flue gas duct while a swirling gas flow is generated using the gas diffusion facilitating unit, wherein the gas diffusion facilitating unit is disposed in the flue gas duct, and the gas diffusion facilitating unit includes: a spraying pipe header inserted into the flue gas duct and disposed in a direction orthogonal to a gas flow direction in the flue gas duct; a plurality of spray nozzles disposed on the spraying pipe header at certain intervals; and a swirling diffuser plate that is disposed on an opening side of the spray nozzle to form a vertical vortex flow in the gas flow direction, wherein the swirling diffuser plate has a flat shape at one side parallel to the spraying pipe header and a wavy shape corresponding to the certain intervals at the other side.