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Reduction of NO_(x)emission based on optimized proportions of mill scale and coke breeze in sintering process

International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1453-1461页

作者： Zhi-gang Que Xian-bin Ai Sheng-li Wu Institute of Energy Research Jiangxi Academy of ScienceNanchang 330096China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China

Reducing NO_(x) emission of iron ore sintering process in a cost effective manner is a challenge for the iron and steel industry at present.Effects of the proportion of mill scale and coke breeze on the NO_(x) emission,strength of sinter,and sinter indexes were studied by com-bustion and sinter pot tests.Results showed that the peak value of NO concentration,total of NO emission,and fuel-N conversion rate gradu-ally decreased as the proportions of the mill scale increased because NO was reduced to N_(2) by Fe_(3)O_(4),FeO,and Fe in the mill scale.The strength of sinter reached the highest value at 8.0wt%mill scale due to the formation of minerals with low melting point.The fuel-N conver-sion rate slightly fluctuated and total NO_(x) emission significantly decreased with the decreased proportions of coke breeze because CO forma-tion and content of N element in the sintered mixture decreased.However,the sinter strength also decreased due to the decrease in the amount of the melting minerals.Furthermore,results of the sinter pot tests indicated that NO_(x) emission decreased.The sinter indexes performed well when the proportions of mill scale and coke breeze were 8.0wt%and 3.70wt%respectively in the sintered mixture.

关键词： iron ore sinter NO_(x)emission mill scale coke breeze proportion optimization

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Thermal analysis and kinetic modeling of pulverized coal combustion accompanied with coke breeze

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Journal of Iron and Steel Research(International) 2021年第7期28卷 809-817页

作者： Peng Han Wen-long Zhan Hao-bin Zhu Lei Gao Ying-chang Yu Zhi-jun He Jun-hong Zhang Qing-hai Pang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051LiaoningChina Key Laboratory of Green-Chemistry Materials in University of Yunnan Province Yunnan Minzu UniversityKunming 650504YunnanChina Ansteel Engineering Technology Corporation Limited Anshan 114021LiaoningChina

Pulverized coal injection technique has been widely used as a means of reducing coke consumption during ironmaking process.Owing to the increasing shortage of fossil fuels,other substitutes such as biomass,plastic,and waste tires have been studied in recent years.coke breeze as one of the by-products of coking industries has been investigated as a substitute for partial pulverized coals.The combustion characteristics of blended fuels were estimated based on the flammability index C and the combustion characteristic index S.For different coke breeze additions,the combustion was divided into two stages,and the apparent kinetic parameters of the two stages were estimated by fitting the experimental data to the shrinkage reaction model and shrinkage diffusion model,respectively.Results showed that with the increase in coke breeze addition from 15% to 60%,the indexes C and S decrease,and the activation energy of the first stage remains almost constant,while that of the last stage increases from 16.89 up to 67.18 kJ mol^(-1),which indicates that adding coke breeze decreases the combustion efficiency of pulverized coal.Comparing the combustion and kinetic parameters under different coke breeze addition conditions,the optimal addition amount is suggested to be within 15%.

关键词： Blast furnace Pulverized coal injection coke breeze Combustion Kinetic model

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NO_x reduction in the sintering process

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International Journal of Minerals,Metallurgy and Materials 2009年第2期16卷 143-148页

作者： Yan-guang Chen Zhan-cheng Guo Zhi Wang Gen-sheng Feng State Key Laboratory of Multiphase Complex System Institute of Process Engineering Chinese Academy Sciences Beijing 100190 China Graduate University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of the Ministry of Education of China for Recycling ＆ Ecologic Metallurgy University of Science and Technology Beijing Beijing 100083China

A new process, NOx reduction with recycling flue gas and modifying coke breeze, was proposed. The effects of modified coke breeze and recycled flue gas on NOx reduction were investigated by sinter pot tests. The results show that the NOx reduction rate is over 10wt% in the sintering of modified coke breeze, the effects of the additives on NOx reduction are： CeO2〉CaO〉K2CO3. The NOx reduction rate increases with the amount of recycled flue gas, and is 22.35wt% in the sintering with recycling 30vol% of the flue gas. When 30vol% of the flue gas is recycled into the sintering of CeO2, CaO, and K2CO3 modified coke breeze, the NOx reduction rates are 36.10wt%, 32.56wt%, and 32.17wt%, respectively.

关键词： nitrogen oxide flue gas coke breeze cerium oxide sintering

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Evaluation of granulability and absorbtivity of biomass in agglomeration mixture

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Journal of Central South University 2017年第10期24卷 2260-2265页

作者： Hudák Jozef Lesko Jaroslav Semanová Zuzana Frohlichová Mária Findorák Róbert Legemza Jaroslav Institute of Metallurgy Faculty of MetallurgyTechnical University of KosiceKosice04200Slovakia

The granulability and absorbtivity of sawdust and coke breeze were investigated.These properties are important within the preparation of agglomeration charge.They have a significant impact on plynodynamic batch conditions.Ability of materials to wet is a fundamental condition of granulability of materials.Wettability and water absorption of wood with liquids is generally significantly affected by their chemical structure.The important factors affecting the wetting process are undoubtedly the wood moisture content,the value of the surface tension of liquid media and their chemical composition.With increasing moisture content of wood,the time to equilibrium rises.Determination of water absorption and granulability of sawdust was conducted to seek their possible use as a partial replacement of coke dust in the production of the agglomerate.Experiments have been realized with alder,oak and pine sawdust and reference material-coke breeze.These materials were divided to four classes of granularity:supplied material,1-2 mm,0.5-1 mm and less than 0.5 mm.And different liquid media were used:water 16°C,water 60°C,soapy water,lime milk and surfactant.

关键词： agglomeration biomass coke breeze granulability absorbtivity

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