Household garbage incineration fly ash source reduction treatment system and method

Abstract

The invention discloses a household garbage incineration fly ash source reduction treatment system and method, and the treatment system comprises a deacidification reaction tower, a classifier and a chelating agent atomization reactor which are sequentially communicated, the bottom of the deacidification reaction tower is connected with a circulating fan, and household garbage incineration flue gas enters the deacidification reaction tower for deacidification treatment; the bottom ash of the deacidification reaction tower enters the deacidification reaction tower again under the action of thecirculating fan to be circulated, the flue gas subjected to deacidification treatment is classified into fine-particle fly ash and coarse-particle fly ash through the classifier, and the fine-particlefly ash enters the chelating agent atomization reactor to be subjected to chelating stabilization treatment for the first time; and the treated fine-particle fly ash and the treated coarse-particle fly ash are converged and subjected to dust removal treatment and secondary chelating stabilization treatment in sequence. According to the method, the consumption of consumables in the flue gas purification process is reduced, the action efficiency of desulfurization and heavy metal fixing agents is improved, the fly ash yield and harmless treatment cost are reduced, and fly ash reduction and efficient stabilization treatment of heavy metals are realized.

Description

technical field [0001] The invention belongs to the technical field of waste incineration treatment, and in particular relates to a source reduction treatment system and method for domestic waste incineration fly ash. Background technique [0002] With the continuous improvement of the flue gas purification level, the fine particles trapped and captured by the flue gas purification system—domestic waste incineration fly ash (hereinafter referred to as fly ash) become more and more "dirty". Due to the enrichment of highly toxic heavy metals and dioxin-like pollutants, the treatment of fly ash has always been the focus and key link in pollution control and risk management of incineration plants. Based on the basic properties of fly ash and the main ways of risk control, there are currently two technical routes for fly ash treatment: land disposal and building material utilization. Specifically, land disposal includes landfill disposal after solidification and stabilization an...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the large volatility of fly ash samples, the stabilization process cannot make timely and effective adjustments according to the changes in the content of heavy metals in fly ash

[0007] (2) The stirring efficiency of the existing primary chelation stabilization treatment process fails to make the chelating agent fully contact with fine particles containing heavy metals, and the chelating effect of the agent cannot be brought into play

[0008] (3) The fixation effect and long-term effect of a single chelating agent on heavy metals are not as good as the combined effect of cement and chelating agent

[0009] (4) Chelating agents have no stabilizing effect on dioxins

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