A method and system for staged desorption of dioxins from fly ash and synergistic treatment of flue gas
By treating fly ash with dechlorination and catalyst passivation, combined with staged preheating and air atmosphere desorption, and using an incinerator for co-processing, the problems of high cost and high energy consumption in dioxin treatment of fly ash have been solved, achieving efficient removal and resource utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TONGJI UNIV
- Filing Date
- 2026-01-30
- Publication Date
- 2026-05-26
AI Technical Summary
In existing fly ash treatment technologies, high concentrations of dioxins limit resource utilization, inert atmosphere desorption is costly and energy-intensive, high-temperature air atmosphere desorption equipment suffers severe wear and heavy metal volatilization, and dioxins are severely de novo synthesized under medium-temperature air atmosphere, resulting in poor desorption effects. Furthermore, flue gas purification systems require large investments and have high operating costs.
By dechlorinating and/or passivating fly ash with catalysts, preheating and desorption in stages, utilizing the short residence time of air atmosphere in the sensitive temperature zone, and co-processing with incinerator, dioxin de novo synthesis is avoided. Indirect heat exchange preheating and waste heat utilization are adopted to reduce energy consumption and suppress heavy metal volatilization.
It achieves efficient removal of dioxins from fly ash, reduces operating costs and energy consumption, extends equipment life, reduces environmental risks and transportation costs, and is applicable to various pre-treatment fly ash, offering good flexibility.
Smart Images
Figure CN121607400B_ABST