含氧卤化物改性制备烟气脱汞用活性焦及其表征与评价

通过捏合过程向活性焦中加入卤酸钾添加剂对活性焦进行改性制备,使用扫描电镜和X射线能谱分析等表征手段对制备的活性焦样品的表面形貌、含氧官能团种类和相对含量等进行分析,使用模拟烟气对制备的活性焦样品进行汞吸附性能评价。研究发现,卤酸钾添加剂的部分分解作用可提高活化程度,优化活性焦的孔隙结构;同时发现卤酸钾添加剂可增加活性焦中C—O官能团的相对含量,与空白活性焦样品相比,3种改性后的活性焦样品中C—O官能团的相对含量分别增加13.2%,15.2%,15.7%。汞吸附性能评价发现随着活性焦中C—O官能团相对含量增加,汞吸附性能随之增加。通过卤酸钾添加剂对活性焦改性制备可有效提高其汞脱除效率。

sing Oxygenated Halides to prepare modified activated coke for Mercury removal from flue gas and its characterization and evaluation

The potassium halide additive was added through kneading process to modify the activated coke.The scanning electron microscope and X-ray photoelectron spectroscopy were used to analyze the surface morphology,the kind of oxygen-containing functional groups and the relative content of oxygen-containing functional groups of the prepared activated coke.Using simulated flue gas,the mercury removal performance of the prepared activated coke samples was evaluated.The analysis found that the partial decomposition of potassium halide additive can improve the degree of activation,optimize the pore structure of the activated coke.Also,the potassium halide additive increases the relative content of the C—O functional groups in the activated coke.Compared with the blank sample of the activated coke,the relative content of the C—O functional groups in the three kinds of modified activated coke samples increase 13.2%,15.2%,15.7% respectively.The mercury performance evaluation found that with the relative content of the C—O functional groups,the mercury removal performance of the activated coke is strengthened.Preparation of the modified activated coke by using potassium halide additive can effectively improve its mercury removal efficiency.