A molten salt heat treatment system for waste incineration fly ash

Abstract

The invention relates to the field of garbage incineration fly ash treatment, in particular to a garbage incineration fly ash molten salt heat treatment system. The waste incineration fly ash molten salt heat treatment system includes a raw material feeding system, a fly ash heat treatment system, a material discharge control system, a waste heat recovery system, and a flue gas purification system. The raw material feeding system includes molten salt storage bins, fly ash storage bins, and feeding devices; the fly ash heat treatment system includes reaction furnaces, electric heating rods, stirrers, and temperature controllers; the discharge control system includes liquid level sensors, density sensors, Constant temperature slag bag, centrifugal granulator, trap; waste heat recovery system includes heat transfer oil heat exchanger, thermal oil circulation pump and supporting pipelines; flue gas purification system includes induced draft fan and purification equipment. The invention revolves around the molten salt heat treatment of fly ash, realizes the resource recovery and detoxification treatment of fly ash simultaneously, and promotes the energy saving and emission reduction of the fly ash heat treatment process and the deep resource utilization of products through tail gas purification, intelligent slag discharge and slag waste heat recovery use.

Description

technical field [0001] The invention relates to the field of waste incineration fly ash treatment. More specifically, the invention relates to a molten salt heat treatment system for waste incineration fly ash. Background technique [0002] Waste incineration fly ash is a dangerous solid waste rich in pollutants such as dioxins and heavy metals. At present, the treatment method of waste incineration fly ash in my country is mainly solidified landfill. However, the solidified fly ash has obvious problems of volume increase and weight gain, which wastes a lot of valuable land resources, and at the same time, it is impossible to recycle the abundant metals and other resources in the fly ash. [0003] The molten salt heat treatment method of waste incineration fly ash is a new type of fly ash treatment technology. Compared with traditional heat treatment methods such as sintering and melting of fly ash, molten salt heat treatment can greatly reduce the temperature of fly ash he...

AI Technical Summary

Problems solved by technology

[0005] The difference in density between fly ash and molten salt during heat treatment causes some components of fly ash to float on the surface of molten salt, which is not conducive to the dissolution and recovery of fly ash components

[0006] The solidified molten salt products and slag products after heat treatment have a hard surface, and are very easy to absorb water and moisture and are corrosive, difficult to separate, and complicated processes

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