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Particuology 2023年第3期74卷 35-47页

作者： Jiankang Wang Pengnan Ma Hanxiao Meng Fangzheng Cheng Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

To better understand the evolution characteristics of bed porous structure during iron ore sintering,X-ray computed tomography scanning technology was used to analyze the pore parameters in different areas of the sintering bed.A pore skeleton structure model was established to study the characteristics of the airflow channels in different *** absolute permeability of different areas was calculated through simulation,and the corresponding streamline and pressure drop distribution were *** results show that the porosity of raw material zone,high-temperature zone,and sintered zone increases gradually,which are 37.69%,46.41%,and 55.57%,*** absolute permeability calculation results of the raw material zone and sintered zones are 792.49μm^(2) and 20560.80μm^(2),while the tortuosity is 1.77 and 1.45,*** with the raw material zone,the flow streamline in the sintered zone is thicker and denser,the airflow resistance and the pressure drop are minor.

关键词： flame front Porous bed structure Iron ore sintering

Influence of O_2 Content in Circulating Flue Gas on Iron Ore Sintering

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Journal of Iron and Steel Research International 2013年第6期20卷 1-6页

作者： FAN Xiao-hui YU Zhi-yuan GAN Min LI Wen-qi JI Zhi-yun School of Minerals Processing and Bioengineering Central South University

Circulating flue gas can reduce the emission of flue gas , and furthermore , it can reuse the waste heat effectively in the sintering *** with conventional sintering , O2 that gets through the sintering bed decreases because of substituting circulating gas for *** influences of O2 content on sintering process are studied through simulating the flue gas circulation sintering with artificial *** shows that , with the reducing of O2 content in circulating gas , the combustion speed of fuel decreases and incomplete combustion degree increases , which makes the flame front fall behind the heat front and reduces the heat utilization efficiency of *** ultimate result is that the temperature of sintering bed decreases and the liquid phase *** addition , the reducing atmosphere is strengthened because of flue gas circulation , which makes the magnetite increase yet calcium ferrite reduce gradually. Because the content of calcium ferrite with good strength reduces , the sinter yield and tumble strength *** ensure the sinter index , the favorable O2 content of circulating flue gas is no less than 15%.

关键词： flue gas circulation sintering heat front flame front sintering metallogenium

Combustion behavior and influence mechanism of CO on iron ore sintering with flue gas recirculation

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Journal of Central South University 2014年第6期21卷 2391-2396页

作者：范晓慧余志元甘敏陈许玲季志云 School of Minerals Processing and Bioengineering Central South University

The properties of circulating gas have a significant effect on sintering with flue gas recirculation,and the influence of CO in sintering process was *** results show that the post-combustion of CO conducts in sinter zone when flue gas passes through the sintering bed,which releases much heat and reduces the consumption of solid *** ratio of coke breeze can be reduced from 5% to 4.7% with 2% CO in circulating flue *** addition,with the increase of CO content in circulating flue gas,the combustion efficiency of fuel is improved,and the flame front is increased slightly while still matches with the heat transfer *** are beneficial to increasing the maximum temperature and prolonging the high temperature duration,especially in the upper layer of sintering *** a consequence,the productivity,vertical sintering velocity and quality of sinter are improved.

关键词： flue gas recirculation heat transfer front flame front combustion behavior

Influence of coke rate on thermal treatment of waste selective catalytic reduction(SCR)catalyst during iron ore sintering

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Chinese Journal of Chemical Engineering 2022年第2期35卷 415-423页

作者： Pengnan Ma Jiankang Wang Hanxiao Meng Laiquan Lv Hao Fang Kefa Cen Hao Zhou State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

Waste selective catalytic reduction(SCR)catalyst as a hazardous waste has a significant impact on the environment and human *** present study,a novel technology for thermal treatment of waste SCR catalyst was proposed by adding it to sinter mix for iron ore *** influences of coke rate on the flame front propagation,sinter microstructure,and sinter quality during sintering co-processing the waste SCR catalyst process were *** situ tests results indicated the maximum sintering bed temperature increased at higher coke rate,indicating more liquid phase generated and higher airflow *** sintering time was longer and the calculated flame front speed dropped at higher coke *** microstructure results found the coalescence and reshaping of bubbles were more fully with increasing coke *** porosity dropped from 35.28%to 25.66%,the pore average diameter of large pores decreased from 383.76μm to 311.43μ*** increasing coke rate,the sinter indexes of tumbler index,productivity,and yield,increased from 33.2%,9.2 t·m^(-2)·d^(-1),28.9%to 58.0%,36.0 t·m^(-2)·d^(-1),68.9%,***,a comprehensive index was introduced to systematically assess the influence of coke rate on sinter quality,which rose from 100 to 200 when coke rate was increased from 3.5%(mass)to 5.5%(mass).

关键词： flame front Waste selective catalytic reduction(SCR) catalyst Thermal treatment Iron ore sintering

Effect of H_2O(g)Content in Circulating Flue Gas on Iron Ore Sintering with Flue Gas Recirculation

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Journal of Iron and Steel Research International 2015年第12期22卷 1107-1112页

作者： Xu-ling CHEN Yun-song HUANG Min GAN Xiao-hui FAN Zhi-yuan YU Li-shun YUAN School of Minerals Processing and Bioengineering Central South University

The influence of H2O （g） content in circulating flue gas on sintering was studied by simulating the flue gas circulating sintering. The results show that the burning speed of solid fuel and the heat transfer rate during sintering process are improved when the H2O （g） content increases from 0 to 6%, which accelerates the sintering speed. However, when the H2O （g） content exceeds 6 %, the over-wet zone in sinter bed is thickened, which deteriorates the permeability of sintering bed. In addition, the magnetite content in sinter increases, while the acicular calcium ferrite content decreases. Accordingly, the sinter yield and tumble index decrease with excessive H2O （g） content. To guarantee the yield and quality of sinter, the favourable H2O （g） content in circulating flue gas should be controlled to be less than 6%.

关键词： flue gas circulating sintering burning speed heat front flame front sinter