Harmless secondary recycling system for waste incineration fly ash

Abstract

The invention belongs to the technical field of waste incineration, and particularly relates to a harmless secondary recycling system for waste incineration fly ash, which comprises an incinerator and a smoke exhaust assembly, a preheating assembly is arranged on the smoke exhaust assembly, one side of the preheating assembly is connected with an air blower, and the air blower and the incinerator are connected together and communicated with each other. High-temperature flue gas discharged by an incinerator can be cooled, it is ensured that the temperature is low when the high-temperature flue gas enters the cyclone filter to be filtered and purified, and the filtering and purifying effect of the cyclone filter cannot be affected or damaged due to the high temperature; flying-back particles in the flue gas can be recycled, gathered and secondarily utilized through the cyclone filter; air which enters the incinerator and is mixed with garbage for combustion is heated through high-temperature flue gas, the combustion speed of the garbage in the incinerator can be higher when the air enters the incinerator, and the garbage can be combusted more sufficiently in the incinerator.

Description

technical field [0001] The invention relates to the technical field of waste incineration, and in particular to a harmless secondary recycling system for waste incineration fly ash. Background technique [0002] With the rapid development of waste incineration and medical waste incineration, the output of waste incineration fly ash is increasing year by year. The latest 2016 edition of the "National Hazardous Waste List" lists the domestic waste incineration fly ash as "HW18 incineration disposal residues", that is, the fly ash must be pretreated to stabilize the heavy metals and dioxins and other pollutants before it can enter the domestic waste filling. Buried. Therefore, the harmless recycling of waste incineration fly ash is imminent. [0003] The use of incineration to treat municipal solid waste is a relatively effective waste treatment method at home and abroad. In the past five years, the average annual waste incineration in my country has reached 60 million tons. ...

AI Technical Summary

Problems solved by technology

However, with the establishment and long-term operation of waste incineration power plants, the problem of secondary pollution continues to emerge. Toxic organic substances such as dioxins, heavy metals, and soluble salts produced during the incineration process can be enriched in fly ash, so Incineration fly ash is considered a hazardous waste and must be stabilized

However, the disposal capacity of hazardous waste in most cities in China is seriously insufficient, and there are generally problems such as lack of effective management of hazardous waste, backward treatment and disposal technology, high economic cost of treatment, and a large amount of secondary pollution caused by improper treatment and disposal.

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