Device and method for heat recovery and utilization of waste incinerator fly ash treated by high-temperature melting method

Abstract

The invention belongs to the technical field of manufacture of environmental protection equipment, and relates to a thermal energy recycling device and method for treating flying ash of a garbage incinerator by a high-temperature melting method. The device comprises a high-temperature melting furnace, an IHE, a high-temperature tail gas heat sink, a molten slag cooling and conveying device, flue gas heavy metal desorption treatment equipment, a garbage incineration boiler, a dust remover and a chimney, wherein high-temperature tail gas of the high-temperature melting furnace is delivered to the flue gas heavy metal desorption treatment equipment and is treated after being cooled; molten slag in the high-temperature melting furnace becomes glass bodies after being cooled; the glass bodies are discharged along with a conveying chain of the molten slag cooling and conveying device; and thermal energy of the high-temperature tail gas and thermal energy in the molten slag are recycled in the garbage incineration boiler and is utilized. Garbage flying ash treated by the high-temperature melting method is directly applied to the garbage incineration boiler, energy consumption cost is greatly reduced, furthermore, the tail gas treatment mode is simplified, a system is also simplified greatly, primary investment costs are reduced, and by application of the high-temperature melting method on the garbage incineration boiler, harmless treatment of the flying ash can be realized, and furthermore, the economic value is high.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment manufacturing, and relates to a heat energy recycling device and method for processing waste incineration fly ash by high-temperature melting method. Background technique [0002] At present, a large amount of fly ash produced by waste incineration boilers is a hazardous waste strictly controlled by the state. The current typical treatment methods include cement solidification and chelating agent stabilization. After these methods, secondary pollution is not easy to occur. Using cement solidification chelating agent stabilization technology, the leaching rate of cement solidification is relatively high, and the volume of cement solidification is relatively high, which not only increases the volume of fly ash, but also requires pretreatment or addition of additives, which may affect cement. The solidification of the slurry will increase the cost, and the alkalinity of the...

AI Technical Summary

Problems solved by technology

However, studies have shown that the high-temperature melting method consumes a lot of energy, so the cost of fly ash treatment is very high; at the same time, the high-temperature tail gas of the melting furnace cannot be directly discharged into the atmosphere because it contains a large amount of heavy metals and soot, requiring complicated cooling, Equipment such as heavy metal removal and dust removal, the system is complex, and the cost of investment and operation and maintenance is high

High equipment and operating costs make it difficult to implement engineering applications and large-scale promotion of this technology

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