O3 oxidation combined with semi-dry method for simultaneous desulfurization and denitrification of sintering/pelletizing flue gas

With the vigorous development of China's iron and steel industry and the introduction of ultra-low emission policies,the emission of pollutants such as SO2 and ...     

Carbon consumption and regeneration of oxygen-containing functional groups on activated carbon for flue gas purification

Environmental Science and Pollution Research - High carbon consumption is an important factor restricting the wide application of activated carbon technology for flue gas purification. A fixed-bed...     

淮南潘集采煤沉陷区地表水中氮、磷特征

根据2012年11月至2013年9月的9次监测数据,分析了淮南潘集开放型和封闭型采煤沉陷区地表水中氮、磷时空分布特征及污染源;通过相关性分析揭示了同类水体内氮、磷之间的响应关系和运移特征;通过各形态氮、磷比率分析了两类水体中氮、磷组成.结果表明,NH3-N(氨氮)年内时间差异性较小,整体呈KB(开放型地表水)>FB(封闭型地表水),最大值分别为0.621 mg·L-1(6月)和0.813 mg·L-1(6月);NO-2-N(亚硝酸氮)时空差异性均较小,NO-3-N(硝酸盐氮)和TN(总氮)年内时间差异性较大,空间差异性较小,整体上均呈FB>KB.KB与FB内NO-2-N最大值分别为0.0485 mg·L-1(6月)和0.0532 mg·L-1(6月),NO-3-N(硝酸盐氮)最大值分别为0.635 mg·L-1(11月)和0.623 mg·L-1(4月),TN最大值分别为2.295 mg·L-1(11月)和2.261 mg·L-1(1月).PO3-4和DTP(溶解性总磷)含量基本呈KB>FB,两形态磷在KB内的最大值分别为0.174 mg·L-1(11月)和0.055 mg·L-1(11月),FB内最大值分别为0.0298 mg·L-1(6月)和0.0391 mg·L-1(5月);TP(总磷)基本呈KB相似文献   

Role of NO in Hg oxidation over a commercial selective catalytic reduction catalyst V2O5–WO3/TiO2

Experiments were conducted in a fixed-bed reactor that contained a commercial catalyst, V₂O₅–WO₃/TiO₂, to investigate mercury oxidation in the presence of NO and O₂. Mercury oxidation was improved by NO, and the efficiency was increased by simultaneously adding NO and O₂. With NO and O₂ pretreatment at 350°C, the catalyst exhibited higher catalytic activity for Hg⁰ oxidation, whereas NO pretreatment did not exert a noticeable effect. Decreasing the reaction temperature boosted the performance of the catalyst treated with NO and O₂. Although NO promoted Hg⁰ oxidation at the very beginning, excessive NO counteracted this effect. The results show that NO plays different roles in Hg⁰ oxidation; NO in the gaseous phase may directly react with the adsorbed Hg⁰, but excessive NO hinders Hg⁰ adsorption. The adsorbed NO was converted into active nitrogen species (e.g., NO₂) with oxygen, which facilitated the adsorption and oxidation of Hg⁰. Hg⁰ was oxidized by NO mainly by the Eley–Rideal mechanism. The Hg⁰ temperature-programmed desorption experiment showed that weakly adsorbed mercury species were converted to strongly bound ones in the presence of NO and O₂.     

Regeneration performance and carbon consumption of semi-coke and activated coke for SO2 and NO removal

To decrease the operating cost of flue gas purification technologies based on carbon-based materials, the adsorption and regeneration performance of low-price semi-coke and activated coke were compared for SO₂ and NO removal in a simulated flue gas. The functional groups of the two adsorbents before and after regeneration were characterized by a Fourier transform infrared (FTIR) spectrometer, and were quantitatively assessed using temperature programmed desorption (TPD) coupled with FTIR and acid–base titration. The results show that semi-coke had higher adsorption capacity (16.2% for SO₂ and 38.6% for NO) than activated coke because of its higher content of basic functional groups and lactones. After regeneration, the adsorption performance of semi-coke decreased because the number of active functional groups decreased and the micropores increased. Semi-coke had better regeneration performance than activated coke. Semi-coke had a larger SO₂ recovery of 7.2% and smaller carbon consumption of 12% compared to activated coke. The semi-coke carbon-based adsorbent could be regenerated at lower temperatures to depress the carbon consumption, because the SO₂ recovery was only reduced a small amount.     

硫铁化合物自燃机理及防治技术进展

为了给硫铁化合物自燃事故的预防或控制措施提供一定的理论依据及技术支持,对硫铁化合物形成、自燃机理及防治技术的研究进展进行了综述,并提出相应技术发展方向。     

南方-125摩托车消声器的改制

改制了南方 - 12 5摩托车消声器结构 ,建设了 5个空腔吸着段 ,建筑 4个空腔催化净化尾气段。通过试车结果得出 :消音器效果良好 ,最好在 5 0km h为 82dB(A) ,而尾气催化净化最好效果为HC全部催化为水蒸汽 ,而CO转化掉2 2 2 18% ,CO2 转换掉 2 4 72 7% ,空气含量也明显增加。此消音器改制简单易懂 ,有利于环境方面的要求 ,如果将此消音器加以推广 ,可有很高的经济价值