School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, China.
Waste Manag Res. 2010 Oct;28(10):865-71. doi: 10.1177/0734242X09339952. Epub 2009 Aug 26.
Some samples of semi-dry flue gas desulfurization (FGD) ash were taken from sinter gas of a steel factory. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses were employed to identify the samples in order to investigate their physical and chemical characteristics. The results show that semi-dry FGD ash from a steel factory is stable under atmospheric conditions. It has irregular shape, a smooth surface and loose construction. The size of FGD ash particles is around 0.5-25 µm, the average size is about 5 µm and the median diameter is 4.18 µm. Semi-dry FGD ash from a steel factory consists of CaSO₃, CaSO₄, CaCO₃, some amorphous vitreous material and unburned carbon. An experimental method was found to study the oxidation characteristics of ash. A prediction model of the oxidation efficiency was obtained based on response surface methodology. The results show that not only the temperature, but also gas:solid ratio, play an important role in influencing the oxidation efficiency. The interactions of the gas:solid ratio with temperature play an essential role. An improved response surface model was obtained which can be helpful to describe the degree of oxidation efficiency of semi-dry FGD ash.
一些半干法烟气脱硫（FGD）灰分的样品取自钢铁厂的烧结烟气。采用扫描电子显微镜（SEM）和 X 射线衍射（XRD）分析对样品进行了鉴定，以研究其物理和化学特性。结果表明，来自钢铁厂的半干法 FGD 灰分在大气条件下是稳定的。它具有不规则的形状、光滑的表面和疏松的结构。FGD 灰分颗粒的尺寸约为 0.5-25 µm，平均尺寸约为 5 µm，中值直径为 4.18 µm。来自钢铁厂的半干法 FGD 灰分由 CaSO₃、CaSO₄、CaCO₃、一些无定形玻璃态物质和未燃烧的碳组成。找到了一种研究灰分氧化特性的实验方法。基于响应面法获得了氧化效率的预测模型。结果表明，不仅温度，而且气固比也对氧化效率有重要影响。气固比与温度的相互作用起着重要作用。得到了一个改进的响应面模型，有助于描述半干法 FGD 灰分的氧化效率程度。
