INCINERATION FLUE GAS QUENCHING SYSTEM

Gases from incineration units often contain considerable amounts of hydrogen chloride and elemental chlorine. To facilitate the treatment of these exhaust gases in downstream Systems, they must be reliably cooled to temperatures close to the saturation point (60 – 90°C), either immediately after incineration, after heat recovery in a steam generator. In addition, recycling of the HCl gas as industrial-grade hydrochloric acid is desirable. Finally, in order to meet the emission requirements, any Cl2 present in the flue gases must also be removed.

Graphite quenching system fully meet these requirements. The high temperture flue gas flows through a graphite quencher and is cooled to be in reliably temperature, then is scrubbed in acid absorption column, and finally through an alkaline absorption unit for Cl2 removal, which is operated with water, NaOH and a reducing agent.