钢铁企业烧结烟气脱硝工艺选型探讨

随着环保排放标准的不断提高,烧结烟气脱硝已成为钢铁企业环境治理的重点。对3种常见烧结烟气脱硝工艺的工作原理、优缺点进行对比,对比国内某钢铁企业同等型号烧结机的不同脱硝工艺,从运行成本考虑,提出SCR法可作为烧结烟气脱硝改造的首选工艺。

低温烟气脱除NOx技术特点分析

面对环保行业内低温脱硝烟气治理的难题,该文结合现有脱硝技术的特点,详细地介绍了可用于低温的脱硝技术。同时给出了不同的低温脱硝技术与传统污染物处理技术可能的横向联合,以便于工艺选择时,可以通盘考虑、整体把控。

Effects of surface chemical properties of activated coke on selective catalytic reduction of NO with NH_3 over commercial coal-based activated coke

Surface chemical properties of typical commercial coal-based activated cokes were characterized by Xray photoelectron spectroscopy(XPS) and acid-base titration, and then the influence of surface chemical properties on catalytic performance of activated cokes of NO reduction with NH3 was investigated in a fixed-bed quartz micro reactor at 150 ℃. The results indicate that the selective catalytic reduction(SCR) activity of activated cokes with the increase of its surface acidic sites and oxygen content,obviously, a correlation between catalytic activity and surface acidic sites content by titration has higher linearity than catalytic activity and surface oxygen content by XPS. While basic sites content by acid-base titration have not correlation with SCR activity. It has been proposed that surface basic sites content measured by titration may not be on adjacent of acidic surface oxides and then cannot form of NO2-like species, thus the reaction of reduction of NO with NH3 have been retarded.