Chain grate furnace type fly ash pre-combustion melting device

Abstract

The invention provides a chain grate furnace type fly ash pre-combustion melting device which includes a pre-combustion furnace and a melting furnace which are arranged left and right and are in communication with each other. The pre-combustion furnace is internally provided with a chain grate, a feeding port is arranged at the position, above the chain grate, of the pre-combustion furnace, the bottom of the pre-combustion furnace is provided with an ash discharge bucket, and the tail end of the chain grate is located at the communicating part of the pre-combustion furnace and the melting furnace; the melting furnace is internally provided with at least one combustion nozzle, a smoke exhaust pipe is arranged, and a slag discharge port is arranged at the bottom of the melting furnace. By means of the chain grate furnace type fly ash pre-combustion melting device, granular materials made by mixing fly ash and pre-combustion agents are subjected to pre-combustion and melting to form glassy residues with stable physical properties, the problem of difficult handling of the fly ash is solved, meanwhile, exhaust gas and flue gas waste heat of all links are rationally utilized, and the purposes of energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to a chain furnace type fly ash pre-combustion melting device. Background technique [0002] Fly ash is the residual material collected by the flue gas purification system of domestic waste incineration. Because it contains toxic substances such as dioxins and heavy metals that are not suitable for decomposition, according to the "National List of Hazardous Wastes", fly ash from domestic waste incineration is classified as hazardous waste. With the rapid development of waste incineration, the output of incineration fly ash is huge. How to dispose of fly ash safely, stably and efficiently is an urgent problem to be solved. [0003] At present, the disposal method of fly ash is mainly solidified and stabilized, and landfilled separately after reaching the entrance standard of domestic waste landfill, and a small part is co-processed with cement kiln. Domestic waste incineration fly ash has complex physical properties and serious ha...

AI Technical Summary

Problems solved by technology

[0007] The invention proposes a chain furnace type fly ash pre-combustion melting device, the granular material made by mixing fly ash and modifier is pre-combusted and melted respectively, and the harmful substances in the fly ash are converted into stable vitreous residues , eliminate the environmental risk of fly ash, solve the problem of difficult fly ash disposal, and rationally utilize the tail gas and waste heat of flue gas in each link to achieve the purpose of energy saving and emission reduction

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