Study On The Mixed Incineration Characteristics Of Domestic Waste And Mineralized Wast

In order to realize the harmless,resourcefulness and reduction of mineralized waste,the technical idea of blending and incineration of mineralized waste and domestic waste is proposed.To explore the feasibility of blending domestic waste with mineralized waste with the purpose of conducting research.First,a small-scale experimental study was conducted on thermogravimetric and tube furnace instruments,and the results showed that the differences in elemental and industrial analyses between mineralized waste and domestic waste in Conghua area of Guangzhou city were large,in which the carbon and volatile content of mineralized waste were 55.86%and 75.26%,respectively,which were significantly higher than those of domestic waste(38.45%)and volatile content(69.09%).In the blending and incineration experiments with different ratios(30%,40%,50%,60%,and 70%),the addition of mineralized waste was beneficial to reduce the average activation energy during combustion and did not cause a significant increase in pollutant emissions such as NOx,HCl,and SO2.Among them,the lowest activation energy(148.25 kJ/mol and 153.73 kJ/mol)and the highest combustion index(11.36)can be obtained under the blending condition of 50%mineralized waste,which decreases the activation energy by about 31%and increases the combustion index by 13.71%compared with domestic waste.Secondly,in order to theoretically explore the feasibility of large-scale blending of mineralized waste,numerical simulations of the actual mineralized waste blended and burned in a large waste incinerator using Ansys software showed that with the appropriate air distribution ratio,the combustion region is concentrated in the center of the chamber and the airflow disturbance is more uniform,which facilitates the gas-phase combustion in the incinerator.With the increase of the blending ratio of mineralized waste,the bed coke combustion is advanced.50%blending ratio is favorable to increase the furnace temperature and improve the combustion situation while avoiding local over-temperature.Finally,based on experimental and simulation results,the results of an engineering test of mineralized waste blending in a waste incineration plant in Guangzhou City showed that the grate and furnace operated safely and stably during 50%mineralized waste blending,and the pollutants were discharged in accordance with the standard.There is no significant increase in heavy metal content in the fly ash curing block.However,the blending of mineralized waste significantly reduces the tonnage of electricity generated.Without additional subsidies,the blending of mineralized waste would make a significant reduction in revenue,if blending is done at less than 25%,it can achieve a loss-free performance.Therefore,the blending of mineralized waste is feasible and controllable,both in theory and in practical tests.Blending of mineralized waste with domestic waste in waste incineration plants is a means to achieve resourceful,reduced and harmless disposal of mineralized waste.This paper provides a reference for the large-scale blending of mineralized waste.