Izquierdo M T, Rubio B
Instituto de Carboquímica (CSIC), Miguel Luesma Castán 4, 50018-Zaragoza, Spain.
J Hazard Mater. 2008 Jun 30;155(1-2):199-205. doi: 10.1016/j.jhazmat.2007.11.047. Epub 2007 Nov 22.
Carbon-enriched coal fly ash was evaluated in this work as a low-cost adsorbent for SO2 removal from stack gases. The unburned carbon in coal fly ash was concentrated by mechanical sieving and vegetal oil agglomeration. The carbon concentrates were activated with steam at 900 degrees C in order to develop porosity onto the samples. The performance of these samples in the SO2 abatement was tested in the following conditions: 100 degrees C, 1000 ppmv SO2, 5% O2, 6% water vapor. A good SO2 removal capacity was shown by some of the studied samples that can be related to their textural properties. Cycles of SO2 adsorption/regeneration were carried out in order to evaluate the possibility of thermal regeneration and re-use of these carbons. Regeneration of the exhausted carbons was carried out at 400 degrees C of temperature and a flow of 25 ml/min of Ar. After each cycle, the SO2 removal capacity of the sample decreases.
在本研究中，对富含碳的粉煤灰作为一种从烟道气中去除二氧化硫的低成本吸附剂进行了评估。通过机械筛分和植物油团聚法富集粉煤灰中的未燃碳。为了使样品产生孔隙，将碳精矿在900℃下用蒸汽活化。在以下条件下测试了这些样品在二氧化硫减排方面的性能：100℃、1000 ppmv二氧化硫、5%氧气、6%水蒸气。一些研究样品表现出良好的二氧化硫去除能力，这可能与其结构性质有关。进行了二氧化硫吸附/再生循环，以评估这些碳进行热再生和再利用的可能性。在400℃的温度和25 ml/min的氩气流下对耗尽的碳进行再生。每个循环后，样品的二氧化硫去除能力都会下降。
