| 论文简介 |
Large amounts of potassium and silicon elements contained in biomass ashes can substitute for equivalent
quality of raw materials to make agricultural or industrial products. In this study, a multi-step
extracting method for straw/woody biomass ashes is developed to enhance their utilization effi-
ciencies. After the same treatment processes, different products are obtained from biomass ashes at
500 C and also characterized by X-ray diffraction (XRD) and X-ray fluorescence (XRF). In addition, the
slagging/fouling tendencies of three kinds of biomass ashes were well evaluated by adapting the
coupling approach, which considering two compositional ternary diagrams, some empirical indices and
soluble salts content. Moreover, it was also in comparison with that of fifty three kinds of biomasses from
references. The results show that potassium element in extractive products from biomass ashes mainly
exists as potassium chlorides and sulfates, such as KCl, K2SO4, KNaSO4 and KNa3(SO4)2. More potassium
salts could be recycled from ashes by decreasing the burning temperature of straw/woody biomass. The
extracting ratio of potassium salts from cotton straw ashes and sawdust ashes increases sharply at first,
then tends to smooth. The initial extraction ratio of 64.04% for cotton straw ashes is larger than that of
wheat straw ashes and sawdust ashes. The order in the total accumulated extracting ratio of potassium
from ashes is cotton straw > wheat straw > sawdust. This method could be suggested as a feasible and
sustainable utilization option for biomass solid wastes. In addition, the high deposition and corrosion risk
are estimated for wheat straw, and the medium one for cotton straw and sawdust with the coupling
approach, if they will be used as input material for boilers. |
(创新港)
