碱金属对焦炭与CO_2或水蒸汽气化反应的影响
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摘要
采用自制的气-固相反应装置研究了K/Na对焦炭与CO_2和水蒸汽气化反应的影响.结果表明,K/Na对焦炭与CO_2气化反应的催化作用强于对焦炭与水蒸汽反应的催化作用,焦炭中Na含量由0.045wt%增加到0.727wt%,焦炭与CO_2和水蒸汽气化反应的反应性指数分别增加23.17%和14.35%,反应后焦炭强度分别降低27.55%和18.31%.焦炭中K/Na含量增加,焦炭与CO_2和水蒸汽气化反应明显开始温度、激烈反应温度和反应表观活化能均降低,焦炭中Na含量由0.045wt%增加到0.727wt%,焦炭与CO_2和水蒸汽气化反应明显开始温度分别降低170和20℃,激烈反应温度分别降低165和80℃,Na含量由0.045wt%增加到0.326wt%,表观活化能分别降低22.56和9.26 k J/mol.
The effects of K/Na on the gasification reaction of coke with CO_2 or steam were studied by self-made gas-solid reaction device. The results showed that the effect of K/Na on coke gasification reaction with CO_2 is stronger than that with steam. While the content of Na in coke increased from 0.045 wt% to 0.727 wt%, the reactivity index of coke with CO_2 and steam increased by 23.17% and 14.35% respectively, and the coke strength decreased by 27.55% and 18.31% respectively after reaction. With the increase of K/Na content in coke, the apparent start temperature, severe reaction temperature and apparent activation energy of coke gasification reaction with CO_2 and steam were obviously reduced. While the content of Na in coke increased from 0.045 wt% to 0.727 wt%, the apparent start temperature of coke gasification reaction with CO_2 and steam ahead of 170 and 20℃ respectively, and the severe reaction temperature ahead of 165 and 80℃ respectively. While the content of Na in coke increased from 0.045 wt% to 0.326 wt%, the apparent activation energy of coke gasification reaction with CO_2 and steam decreased by 22.56 and 9.26 k J/mol respectively.
The effects of K/Na on the gasification reaction of coke with CO_2 or steam were studied by self-made gas-solid reaction device. The results showed that the effect of K/Na on coke gasification reaction with CO_2 is stronger than that with steam. While the content of Na in coke increased from 0.045 wt% to 0.727 wt%, the reactivity index of coke with CO_2 and steam increased by 23.17% and 14.35% respectively, and the coke strength decreased by 27.55% and 18.31% respectively after reaction. With the increase of K/Na content in coke, the apparent start temperature, severe reaction temperature and apparent activation energy of coke gasification reaction with CO_2 and steam were obviously reduced. While the content of Na in coke increased from 0.045 wt% to 0.727 wt%, the apparent start temperature of coke gasification reaction with CO_2 and steam ahead of 170 and 20℃ respectively, and the severe reaction temperature ahead of 165 and 80℃ respectively. While the content of Na in coke increased from 0.045 wt% to 0.326 wt%, the apparent activation energy of coke gasification reaction with CO_2 and steam decreased by 22.56 and 9.26 k J/mol respectively.
引文
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[2]赵宏博,程树森.高炉碱金属富集区域钾、钠加剧焦炭劣化新认识及其量化控制模型[J].北京科技大学学报,2012,34(3):333-341.Zhao H B,Cheng S S.New Cognition on coke degradation by potassium and sodium in alkali enriched regions and quantificational control model for BF[J].Journal of University of Science and Technology Beijing,2012,34(3):333-341.
[3]刘永新,张波波,王福先,等.碱金属对焦炭热性能的影响[J].煤炭转化,2008,31(3):43-47.Liu Y X,Zhang B B,Wang F X,et al.Effect of alkaline metal on thermal properties of coke[J].Coal Conversion,2008,31(3):43-47.
[4]庞克亮,奚白,向文国,等.K2O对焦炭-CO2气化反应的影响[C]//中国工程热物理学会年会燃烧学学术会议论文集.2005:205-209.Pang K L,Xi B,Xiang W G,et al.Effect of K2O on the gasification reaction of coke with CO2[C]//China Engineering Thermophysics Society Annual Symposium on Combustion Science.2005:205-209.
[5]房永征,钱湛芬,杨俊和,等.焦炭的深层反应[J].燃料与化工,1998,29(6):301-305.Fang Y Z,Qian Z F,Yang J H,et al.Deep reaction of coke[J].Fuel and Chemical Processes,1998,29(6):301-305.
[6]Kashihara Y,Sawa Y,Sato M.Effect of hydrogen addition on reduction behavior of ore layer mixed with coke[J].ISIJ Int.,2012,52(11):1979-1985.
[7]Wang P,Li J X,Zhou L Y,et al.Theoretical and experimental investigation of oxygen blast furnace process with high injection of hydrogenous fuel[J].Ironmaking Steelmaking,2013,40(4):312-317.
[8]郭文涛,王静松,佘雪峰,等.焦炭与CO2和水蒸汽气化后孔隙结构和高温抗压强度研究[J].燃料化学学报,2015,43(6):654-662.Guo W T,Wang J S,She X F,et al.Pore structure and high-temperature compressive strength of gasified coke with CO2and steam[J].Journal of Fuel Chemistry and Technology,2015,43(6):654-662.
[9]王平,张越强,李家新,等.CO2与水蒸汽对焦炭溶损反应的影响[J].过程工程学报,2016,16(1):138-143.Wang P,Zhang Y Q,Li J X,et al.Effects of CO2 and H2O on solution loss reaction of coke[J].Chin.J.Process Eng.,2016,16(1):138-143.
[10]Iwanaga Y,Takatani K.Mathematical model analysis for oxidation of coke at high temperature[J].ISIJ Int.,1989,29(1):43-48.
[11]龙世刚.焦炭气化反应温度及其对高炉冶炼影响的研究[J].钢铁,1990,25(7):1-5.Long S G.Study on coke gasification reaction temperature and its effect on blast furnace smelting[J].Iron and Steel,1990,25(7):1-5.
[12]王淑兰.物理化学[M].北京:冶金工业出版社,2010:274-275.Wang S L.Physical chemistry[M].Beijing:Metallurgical Industry Press,2010:274-275.
[13]Miura K,Aimi M,Naito J,et al.Steam gasification of carbon effect of several metals on the rate of gasification and the rates of CO and CO2 formation[J].Fuel,1986,65(3):407-411.
[14]Rao Y K.The kinetics of reduction of hematite by carbon[J].Metallurgical Transactions,1971,2(5):1439-1447.
[15]崔平,张磊,杨敏,等.焦炭溶损反应动力学及其模型研究[J].燃料化学学报,2006,34(3):280-284.Cui P,Zhang L,Yang M,et al.Study on kinetics and model of coke loss reaction with CO2 in blast furnace[J].Journal of Fuel Chemistry and Technology,2006,34(3):280-284.
[16]Li K,Zhang J,Barati M,et al.Influence of alkaline(Na,K)vapors on carbon and mineral behavior in blast furnace cokes[J].Fuel,2015,145(37):202-213.
[17]崔平,杨敏.二氧化碳浸蚀后的焦炭微观结构研究[J].燃料与化工,2006,37(4):5-7.Cui P,Yang M.Study on coke microstructure eroded with carbon dioxide[J].Fuel and Chemical Processes,2006,37(4):5-7.