System and method for continuous microwave hydrothermal treatment of dioxins in incineration fly ash

Abstract

The invention discloses a system and method for treating dioxin in incineration fly ash by continuous microwave hydrothermal method, wherein the system for treating dioxin in incineration fly ash by continuous microwave hydrothermal method includes a heat exchange device and a buffer stirring tank , circulation pump, microwave reaction device; the microwave reaction device includes a microwave safety shielding unit, a slurry circulation unit, a microwave irradiation unit and a control unit; the feed port of the slurry circulation unit is connected with a buffer stirring tank, and the slurry circulation unit The discharge port is connected with the heat exchange device; the pipeline between the microwave reaction device and the heat exchange device is provided with a circulation loop communicated with the buffer stirring tank. The invention is based on the traditional hydrothermal treatment and implants high-parameter microwave treatment technology, which can not only remove organic pollutants such as dioxins in incineration fly ash, but also realize large-scale continuous treatment, so that the treatment of dioxins in incineration fly ash Continuous process, safe, convenient, reliable effect, small footprint, cost-effective.

Description

technical field [0001] The invention belongs to the field of fly ash disposal, and in particular relates to a system and method for treating dioxins in incineration fly ash by a continuous microwave hydrothermal 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 proportion of weight. The fly ash generated during the incineration process contains a large amount of heavy metals and dioxin-like organic pollutants. Therefore, the incineration fly ash must be disposed of harmlessly and utilized as a resource. [0003] At present, one of the major technical difficulties in the resource utilization of incineration-like 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-sequential, discontinuous devices and corresponding systems, and are limited to a r...

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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.

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