The purpose of this study is to investigate ignition loss and heavy metals of bottom ash and fly ash at a stoker type MSW incinerator. Bottom ash is divided according to grate sifting ash and grate ash, and grate sifting ash is classified drying grate, main grate and burn out grate. Amount of ashes ...
The purpose of this study is to investigate ignition loss and heavy metals of bottom ash and fly ash at a stoker type MSW incinerator. Bottom ash is divided according to grate sifting ash and grate ash, and grate sifting ash is classified drying grate, main grate and burn out grate. Amount of ashes and ignition loss are measured in each stage. To begin with, ash is composed bottom ash 89.7% and fly ash 10.3% in which bottom ash 15.2% and fly ash 1.75% at the rate of incineration amount in research facility. Bottom ashes are amount to 67.7% of grate sifting ash(1.7% drying grate, 31% main grate, 35% burn out grate) and 32.3% of grate ash. Grate sifting ashes are generated in large quantities due to broken grate bar and it is much higher than grate ash in ignition loss. Ignition loss of bottom ash in each stage is investigated that drying grate 42.03%, main grate 12.38%(front-18.0, back-8.94) and burn out grate 7.78% (front-8.47, back-3.6) in grate sifting ashes and grate ashes 3.7%. According to this study, burning time is long in incinerator so long as ignition loss of bottom ashes is lowed. Theoretical ignition loss is 8.45% considering amount and ignition loss of each stage but it is lowed in practically though ash average ignition loss in ash bunker is 6.64% because combustible matters suspended in the cooling water through cooling process of bottom ash is removed. Ashes contained concentration of heavy metals are much affected by character of inputting waste, and also the characteristic of heavy metal give variety to dynamic in incineration. It is analysed by means of KSLT using each stage ash, boiler ash, precipitation ash, and mixing ash(boiler ash+precipitation ash), which gathered previously. Concentration of heavy metals for fly ash is investigated much higher than that of bottom ash in all items. Bottom ash do not exceed the standard point, but fly ash have an excess of Pb. As retention time is long in incineration, concentration of heavy metals for grate sifting ashes in bottom ash is inclined to low. Because heavy metals in waste, that are volatilized during incineration process, are transferred to flue gas. It is investigated that concentration of heavy metals in boiler ash is lower than that of bottom ash except Cr^+6and CN, however we know that of boiler ash is higher than bottom ash. And low melting temperature heavy metal like Pb, Cd shows typical dynamics in incineration. As a result of this study, controlling grate sifting ash is necessary to the reduction for amount and ignition loss of bottom ash. It should be also studied a lot of scheme so that the products of grate sifting ash would be decreased. And it is more important factor for the reduction in concentration of heavy metals in bottom ash.
The purpose of this study is to investigate ignition loss and heavy metals of bottom ash and fly ash at a stoker type MSW incinerator. Bottom ash is divided according to grate sifting ash and grate ash, and grate sifting ash is classified drying grate, main grate and burn out grate. Amount of ashes and ignition loss are measured in each stage. To begin with, ash is composed bottom ash 89.7% and fly ash 10.3% in which bottom ash 15.2% and fly ash 1.75% at the rate of incineration amount in research facility. Bottom ashes are amount to 67.7% of grate sifting ash(1.7% drying grate, 31% main grate, 35% burn out grate) and 32.3% of grate ash. Grate sifting ashes are generated in large quantities due to broken grate bar and it is much higher than grate ash in ignition loss. Ignition loss of bottom ash in each stage is investigated that drying grate 42.03%, main grate 12.38%(front-18.0, back-8.94) and burn out grate 7.78% (front-8.47, back-3.6) in grate sifting ashes and grate ashes 3.7%. According to this study, burning time is long in incinerator so long as ignition loss of bottom ashes is lowed. Theoretical ignition loss is 8.45% considering amount and ignition loss of each stage but it is lowed in practically though ash average ignition loss in ash bunker is 6.64% because combustible matters suspended in the cooling water through cooling process of bottom ash is removed. Ashes contained concentration of heavy metals are much affected by character of inputting waste, and also the characteristic of heavy metal give variety to dynamic in incineration. It is analysed by means of KSLT using each stage ash, boiler ash, precipitation ash, and mixing ash(boiler ash+precipitation ash), which gathered previously. Concentration of heavy metals for fly ash is investigated much higher than that of bottom ash in all items. Bottom ash do not exceed the standard point, but fly ash have an excess of Pb. As retention time is long in incineration, concentration of heavy metals for grate sifting ashes in bottom ash is inclined to low. Because heavy metals in waste, that are volatilized during incineration process, are transferred to flue gas. It is investigated that concentration of heavy metals in boiler ash is lower than that of bottom ash except Cr^+6and CN, however we know that of boiler ash is higher than bottom ash. And low melting temperature heavy metal like Pb, Cd shows typical dynamics in incineration. As a result of this study, controlling grate sifting ash is necessary to the reduction for amount and ignition loss of bottom ash. It should be also studied a lot of scheme so that the products of grate sifting ash would be decreased. And it is more important factor for the reduction in concentration of heavy metals in bottom ash.
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