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Aggregation mechanism of fine fly ash particles in uniform magnetic field
Chang-Sui Zhao,Yong-Wang Li,Xin Wu,Duan-Feng Lu,Song Han 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2
of fly ash particles with size range of 0.023-9.314m in a uniform magnetic field was inves-tigated for removing them. A binary collision-aggregation model evaluating particle aggregation coefficient was devel-oped. Based on the model, particle removal efficiency was calculated by solving the General Dynamic Equation. Thecomparison was done between the calculated and experimental data. The modeling aggregation coefficient shows thatthe aggregation coefficient increases with particle size, and the bigger the size difference between two particles is, thehigher than those of the smaller and bigger ones. The effect of the magnetic flux density on total particle removal effi-ciency is similar to that on aggregation coefficient. Before particles are saturatedly magnetized, their total removal effi-ciency increases with an increase in the magnetic flux density. Higher removal efficiency can also be caused by pro-longing the particle residence time in the magnetic field or increasing their mass concentration. The particle numbermedian diameter decreases with an increase in the total removal efficiency. Calculation results are found to coincideessentially with the experimental data.
NOx emission from incineration of organic liquid waste in a circulating fluidized bed
Chang-Sui Zhao,Hui-Chao Chen,Yong-wang Li,Duan-Feng Lu 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.5
incineration test of a toxic chemical organic waste liquid was conducted on a circulating fluidized bed(CFB) incinerator. The flue gas was measured online with the advanced SAE-19 flue gas analyzer. The effects of severalfactors, in terms of flow rate of waste liquid, ratio of waste liquid injected into dense bed of the CFB, excess air co-efficient, the secondary air fraction and bed temperature on NOx emissions, were verified. The experimental resultsthe excess air coefficient or the bed temperature and those decrease with increase in the ratio of waste liquid injectedinto the dense bed of the CFB or the secondary air fraction. During the test runs, NOx concentration in flue gas metthe national regulation on NOx emissions due to suppresive effect of low temperature and staged combustion in CFBon NOx formation.