Abstract：In order to reveal the combustion characteristics and flue gas emission law of iron ore sintering quasi-particles, different types of quasi-particles were prepared by using analytical reagent instead of sintering raw materials. The combustion law of quasi-particles under different process parameters (oxygen volume percent, heating rate and gas flow rate) was studied by thermogravimetric method, and the influence of quasi-particle structure and adhesive powder composition on CO and NO emission during combustion process was studied by flue gas analyzer. The results show that the influence of oxygen volume percent, heating rate and gas flow rate on the combustion process of different types of quasi-particles are consistent. That is to say, increasing oxygen volume percent and gas flow rate is conducive to enhancing the internal diffusion ability of O2 molecules, promoting carbon-oxygen combustion reaction and improving combustion conditions. Due to the thermal hysteresis effect inside the quasi-particles, the combustion characteristic parameters increase with the increase of heating rate and the combustion reaction moves to high temperature zone. However, due to the different structures of quasi-particles, the influence degree of these process parameters on combustion reaction is also different. The structure of quasi-particles significantly affects heat transfer and mass transfer behavior during combustion process. The peak volume percent of CO and NO generated by S′ type quasi-particle combustion is highest. While S type, C type and P type are hindered by adhesion layer, CO and NO diffusion resistance increases outwardly which the residence time of CO and NO in product layer promots CO reduction NO reaction occurrence reducing CO and NO peak volume fraction. Fe2O3、CaO、MgO have significant catalytic effects on coke powder burning as well as CO-NO reduction reaction with CaO has strongest catalytic ability reducing CO、NO peak volume percent by 48.7%、50.0%.
胡长庆, 李超然, 韩涛, 师学峰. 铁矿粉烧结燃烧行为与CO、NO排放特征[J]. 钢铁, 2023, 58(7): 27-35.
HU Changqing, LI Chaoran, HAN Tao, SHI Xuefeng. Combustion behavior and emission characteristics of CO and NO in iron ore sintering[J]. Iron and Steel, 2023, 58(7): 27-35.
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2023, Vol. 58 
