System and method for treating dioxin in incineration fly ash through continuous microwave hydrothermal method

Abstract

The invention discloses a system and a method for treating dioxin in incineration fly ash through a continuous microwave hydrothermal method. The system for treating dioxin in incineration fly ash through the continuous microwave hydrothermal method comprises a heat exchange device, a buffer stirring tank, a circulating pump and a microwave reaction device. The microwave reaction device comprises a microwave safety shielding unit, a slurry circulating unit, a microwave irradiation unit and a control unit; a feed port of the slurry circulating unit is connected with the buffer stirring tank, and a discharge port of the slurry circulating unit is connected with a heat exchange device; and a circulation loop communicated with the buffer stirring tank is arranged on the pipeline between the microwave reaction device and the heat exchange device. A high-parameter microwave treatment technology is implanted on the basis of traditional hydrothermal method treatment, organic pollutants such as dioxin in the incineration fly ash can be removed, meanwhile, large-scale continuous treatment is achieved, and the incineration fly ash dioxin treatment process is continuous, safe, convenient, reliable in effect, small in occupied area, economical and efficient.

Description

technical field [0001] The invention belongs to the field of fly ash disposal, and in particular relates to a continuous microwave hydrothermal method for treating dioxin in incineration fly ash and a method. Background technique [0002] In my country's industrial and municipal solid waste pollution control work, the incineration process is a treatment process with a high weight ratio. The fly ash generated during the incineration process contains a large amount of heavy metals and dioxin-like organic pollutants, which are listed Therefore, it is necessary to carry out harmless disposal and resource utilization of incineration fly ash. [0003] One of the major technical difficulties currently plaguing the resource utilization of incineration fly ash is the safe, continuous, reliable and efficient removal of dioxin-like organic pollutants. Small and micro experimental equipment, but they are all batch-type, non-continuous devices and corresponding systems, and are limited t...

AI Technical Summary

Problems solved by technology

[0004] The above technology is only suitable for small and micro experimental equipment at the laboratory level. Its power density is low, and it cannot be realized for working conditions with high field strength requirements, and it is difficult to accurately measure the relevant parameters of the reaction system. In addition, because microwave heating mainly focuses on On the material supporting device or device at the bottom of the microwave oven chamber, the materials are not heated uniformly, and they are all batch-sequential intermittent devices. The batch-sequential intermittent heating method cannot meet the process requirements for continuous heating of the processed materials and The corresponding related processing equipment will also bear greater temperature and mechanical alternating stress. In addition, the corresponding system is limited to a single direction target, and the short board is more obvious.

Images