| 摘要 |
An air pollution control system according to the present invention includes a denitration apparatus (13) that reduces nitrogen oxide in flue gas (12) discharged from a coal combustion boiler (11), and that sprays hydrogen chloride (23) into the gas to oxidize mercury, an air heater (14) that recovers heat in gas, a dust collector that reduces dust in gas, a desulfurization apparatus (16) that reduces sulfur oxide in gas from which the dust has been reduced, a stack (17) from which gas thus desulfurized is discharged to the outside, a hydrogen chloride vaporizer (21) that evaporates concentrated hydrochloric acid to obtain the hydrogen chloride (23), and a hydrochloric acid neutralization tank (30) where dilute hydrochloric acid discharged from the hydrogen chloride vaporizer (21) or the concentrated hydrochloric acid is neutralized with an alkali agent (31). Neutralized chloride is supplied to a fuel feeder (33), mixed with a fuel (70), i.e., coal, and then burned as a fuel F in a boiler (11), so as to produce hydrogen chloride in flue gas. Then, together with sprayed hydrogen chloride derived from the hydrogen chloride vaporizer (21), the mercury is reduced. |
