Method and system for combined treatment of household rubbish and fly ash

Abstract

The invention discloses a method and system for combined treatment of household rubbish and fly ash. The method comprises the steps of conducting pretreatment on the household rubbish, and obtaining the smashed and pretreated rubbish in which inorganic substances are removed; conducting drying treatment and pyrolysis treatment on the pretreated rubbish in a revolving bed pyrolyzing furnace so as to obtain pyrolytic carbon and pyrolytic oil gas; conducting oil-gas separation treatment on the pyrolytic oil gas so as to obtain pyrolytic tar and pyrolysis gas; burning the pyrolysis gas and the fly ash in a fusion furnace so as to make the fly ash fuse and solidify heavy metals to obtain a glassy-state solid substance. According to the method, harmless and reduction treatment of the household and the fly ash can be achieved, the cost is low, the method is environmentally friendly, and the method is particularly applicable to industrialized application and promotion.

Description

technical field [0001] The invention relates to the field of environmental engineering, and in particular, the invention relates to a method and a system for joint treatment of domestic garbage and fly ash. Background technique [0002] With the rapid development of the economy, the continuous growth of the population and the improvement of people's living standards, the production of domestic waste in my country has also increased sharply. At present, the annual production of domestic waste in China is about 200 million tons, and it is still increasing by about 10% every year. The speed of growth has caused a great burden on the environment. Two-thirds of the large cities in the country are facing the dilemma of "garbage siege". [0003] At present, landfill and composting, which are commonly used in waste disposal, have fallen into the predicament of occupying a large amount of land and composting products have no market, while waste incineration has always been unable to g...

AI Technical Summary

Problems solved by technology

However, there are still many problems in land disposal of domestic waste incineration fly ash in my country.

Due to the huge amount of production, the storage capacity of hazardous waste safe landfills is limited, which cannot meet the needs of fly ash disposal, and the entry cost is correspondingly high. In practice, there are dioxins and some heavy metals (such as Pb) that are difficult to stably enter sanitary landfills. The question of field standards

In terms of building material utilization, the co-processing of fly ash in cement kilns (and the similar sintering process to prepare ceramsite) has the advantages of replacing some raw materials, large processing capacity, complete incineration and removal of dioxins, more thorough resource utilization, and relatively low cost. Low cost and other advantages, but the high chlorine and high alkali characteristics of fly ash make it necessary to carry out washing pretreatment before entering the cement kiln, resulting in difficult-to-treat washing wastewater. Diffusion and extension, not in line with the principle of "minimization of environmental risk" for hazardous waste disposal

[0005] Therefore, the current domestic waste and fly ash treatment methods still need to be improved

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