NO reduction by carbon-based gases based on coal gasification fractions:NO reduction intermediate identification and kinetic analysis  

作　　者：Xiang Zhang Jian Tian Tanghui Hu Guangyong Yue Xianlong Liu Wen Zhou Xiaohong Liu Xinye Wang 

机构地区：[1]Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials,Hubei Engineering Research Center for Green Industrialization Technology of Industrial Waste,School of Materials Science and Engineering,Hubei University,Wuhan 430062,China [2]Hubei Huda Tianshu New Energy Materials Industrial Research and Design Institute Co.,Ltd.,Wuhan 430062,China [3]Wuhan Tianshu Dust Removal Equipment Co.,Ltd.,Wuhan 430062,China [4]Engineering Laboratory for Energy System Process Conversion&Emission Control Technology of Jiangsu Province,School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China

出　　处：《Frontiers of Environmental Science & Engineering》2025年第3期175-189,共15页环境科学与工程前沿(英文)

基　　金：supported by the Special Project for Innovation-driven Development in Guangxi,China(No.2018AA21013)。

摘　　要：Combining pulverized coal gasifiers with cement kiln production is promising for application in low-cost and efficient NO reduction.This paper presents a pulverized coal gasifier catalytic denitration technique and investigates the homogeneous reduction(by CO and CH_(4))and heterogeneous catalytic reduction(by coke,CaO,MgO,and Fe_(2)O_(3))of NO.A combination of Chemkin simulations and fixed-bed experiments is used to elucidate the reaction pathways and key intermediates of NO reduction by carbon-based gases.In addition,the activation energies for different catalyst combinations were analyzed via reaction kinetics.The results demonstrate that the presence of small amounts of O_(2) inhibits NO reduction by CO but promotes NO reduction by CH_(4).The NCO·radical is essential for the NO reduction process,and the generation of this radical depends on the CH_(4) cleavage intermediate and O·radical.CaO and Fe_(2)O_(3) exhibit more significant catalytic effects on NO reduction by carbon-based gases than the other catalysts tested.The presence of a small amount of O_(2) in the reacting gas mixtures facilitates the NO reduction reaction.The activation energy is reduced to 1.02 kJ/mol,and the NO conversion reaches 99.80%when the catalyst is C+CaO+MgO+Fe_(2)O_(3) and the gas composition is CO+CH_(4)+O_(2).This work provides theoretical support and data recommendations for the use of pulverized coal gasifiers for the denitrification of cement kilns.

关 键 词：Carbon-based gas Catalytic denitration Coke Kinetic analysis Reaction mechanism 

分 类 号：TQ546[化学工程—煤化学工程]