Melting incineration process system for hazardous waste disposal

Abstract

The invention discloses a melting incineration process system for hazardous waste disposal. The melting incineration process system comprises a hazardous waste incineration line system and a high-temperature melting furnace system, wherein the hazardous waste incineration line system comprises an incineration kiln, a secondary combustion chamber, a waste heat recovery device, an acid-removing reactor and a dust remover which sequentially communicate with one another; a feeding device and first spraying guns are arranged at the kiln head of the incineration kiln; a first slagging port is arranged at the kiln tail; a second slagging port is arranged at the bottom of the waste heat recovery device; the high-temperature melting furnace system comprises an additive doping device, a high-temperature melting furnace and a quenched slagging system; the additive doping device communicates with the high-temperature melting furnace; and both the first slagging port and the second slagging port communicate with the high-temperature melting furnace. By adoption of the melting incineration process system disclosed by the invention, the harmless utilization and the recycling of hazardous waste can be achieved. Meanwhile, the energy consumption and the cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment in the field of environmental protection; in particular, it relates to an incineration and melting process system for hazardous waste disposal. Background technique [0002] In the existing large-scale hazardous waste incineration lines, due to the low incineration temperature of the incinerator, which is often only 800-1000 ° C, the ash from the incinerator cannot effectively solidify heavy metals and still has leaching toxicity. According to the "General Rules for the Identification of Hazardous Wastes", the processed products of hazardous wastes with leaching toxicity are still hazardous wastes, so it is necessary to carry out harmless advanced treatment of these ash residues. In addition to the incinerator, the locations where ash and slag are generated are: waste heat boiler, semi-dry / dry reactor, bag filter, etc. At present, the commonly used disposal methods are to adopt ...

AI Technical Summary

Problems solved by technology

However, cement solidification and chemical stabilization are difficult to ensure the long-term stability of the leaching of heavy metal ions in fly ash, nor can they decompose and effectively eliminate dioxins, which still pose a potential threat to human health and ecosystems.

At the same time, this disposal method has very obvious limitations: firstly, a large amount of cement (or lime) and chelating agent need to be added in the curing process, which increases the operating cost; secondly, the large amount of cement and lime used increases the volume of the solidified body and weight, which increases shipping costs

However, this method cannot achieve large-scale disposal of hazardous waste, and when disposing of ash, it is necessary to heat the ash from normal temperature to above 1300°C, which consumes a lot of heat energy

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