Influence of mixed burning of aged refuse on the incineration characteristics of waste furnace
In order to study the influence of mixed burning of aged refuse on incineration characteristics of waste furnace,a mechanical grate incinerator of a waste incineration plant in Ziyang city,Sichuan province was taken as the research object.Its disposal capacity was 375t/d,and the calorific value of waste was 7315kJ/kg.FLUENT and FLIC software were used to simulate and analyze the incineration characteristics of the waste incinerator under different mixing ratios and heating value conditions of aged refuse.Field tests were also carried out.The results showed that as the mixture ratio of aged refuse increased from 0 to 30%,the mass fraction of O2 at the outlet of the incinerator increased,while the flue gas temperature at different height sections decreased.Additionally,the moisture evaporation,volatile pyrolysis and fixed carbon combustion rates on the surface of the waste bed were decreased by 19kg/(m2·h),29kg/(m2·h)and 25kg/(m2·h),respectively.The waste incineration end position lagged by 0.69m.When the heating value of aged refuse raised in the range of 2110-5156kJ/kg,the mass fraction of O2 at the outlet of the incinerator decreased,and the flue gas temperature at different height sections increased.The moisture evaporation,volatile pyrolysis and fixed carbon combustion rates on the surface of the waste bed were improved by 14kg/(m2·h),14kg/(m2·h)and 11kg/(m2·h),and waste incineration end position advanced by 0.85m.Therefore,it is recommended to control the calorific value of the blended waste within the range of 6849-8374kJ/kg,under the premise that the incineration temperature was greater than 1123K and the calorific value design of the incinerator was satisfied.These simulation results provided a practical engineering solution for mixed burning of aged refuse.
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