Patent ID: 8202482

Claim:
An apparatus for removing trace amounts of toxic substances from exhaust gas, wherein an air preheater adapted for heat exchange between air for combustion in combustion equipment and exhaust gas, and a dust removal unit having a bag filter provided with a filter cloth carrying an oxidation catalyst for metallic mercury, are disposed in sequence from an upstream side in a flow channel of exhaust gas emitted from combustion equipment for burning petroleum or coal, wherein a denitration unit including a denitration catalyst layer having functions capable of removing nitrogen oxides from the exhaust gas and capable of oxidizing metallic mercury is disposed in a flow channel of exhaust gas on the upstream side of the air preheater, and a wet desulfurization unit for spraying an absorbent slurry into the flow channel of exhaust gas on a downstream side of the dust removal unit to remove sulfur oxides from the exhaust gas.