Drying thermal desorption treatment system and treatment process for waste incineration fly ash

Abstract

The invention discloses a drying and thermal desorption treatment system and process for waste incineration fly ash, the drying and thermal desorption treatment system is composed of a feeding subsystem, a drying subsystem, a pyrolysis subsystem and a tail gas treatment subsystem, the feeding subsystem conveys pretreated fly ash to the drying subsystem, and the pyrolysis subsystem conveys the pretreated fly ash to the tail gas treatment subsystem; the drying subsystem is used for drying fly ash through indirect heating and gas-solid separation, the pyrolysis subsystem is used for carrying out thermal desorption on the fly ash, harmless fly ash is finally separated out through water cooling and air cooling, and the tail gas treatment subsystem is used for purifying discharged gas through heat exchange, quenching, dust removal and deacidification treatment; fly ash is dried and thermally desorbed through the indirect heating dryer and the indirect heating decomposition furnace, the thermal efficiency is improved, high-temperature gas discharged by the calcining furnace is used for gas supply of other parts through the second gas-gas heat exchanger, heat recovery and reutilization are achieved, consumption of extra energy is reduced, and the energy consumption is reduced. And double improvement of environmental protection and economic benefits of fly ash resourceful treatment is realized.

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