化学链气化过程中昭通褐煤灰对锰矿石载氧体的影响  

Influence of Zhaotong Lignite Ash on Manganese Ore Oxygen Carrier in Chemical Looping Gasification Process

作　　者：高振东 袁思杰 安阳 吴曼[1] 王凌云 郭庆杰[1,2] GAO Zhendong;YUAN Sijie;AN Yang;WU Man;WANG Lingyun;GUO Qingjie(College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;State Key Laboratory of Coal Efficient Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China)

机构地区：[1]青岛科技大学化工学院,山东青岛266042 [2]宁夏大学煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021

出　　处：《石油学报（石油加工）》2022年第4期885-892,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金联合基金重点项目(U20A20124);国家重点研发计划项目(2018YFB0605401);国家自然科学基金地区项目(21868025)资助。

摘　　要：为探究化学链气化过程中煤灰及其组分对锰矿石载氧体的影响及作用机理,制备了昭通褐煤煤灰,以煤灰中主要组分Fe_(2)O_(3)、CaO和MgO等氧化物颗粒配制单一及混合组分的模拟煤灰,在高温流化床反应器中以水蒸气为气化剂进行了系列研究。结果表明:添加5%(质量分数)褐煤煤灰后,合成气产量升高而碳转化率降低,且随着煤灰添加量的继续增多,合成气产量呈先降低后升高趋势,而碳转化率则呈现先升高后降低趋势,在煤灰添加质量分数为15%时,出现最高的碳转化率79.7%和最低的合成气产量0.702 L。Fe_(2)O_(3)组分明显提高了碳转化率和合成气产量;CaO与Mn_(2)O_(3)高温反应生成了Ca_(2)Mn_(2)O_(5),提高了载氧体选择性,使得合成气产量增大;MgO显著降低了碳转化率和合成气产量。双组分及MgO-Fe_(2)O_(3)-CaO三组分模拟煤灰的研究发现,MgO对气化反应进程抑制作用强于Fe_(2)O_(3)和CaO的促进作用,相比于Fe_(2)O_(3)-MgO双组分模拟煤灰,CaO-MgO模拟煤灰对载氧体气化活性的抑制作用影响最大。In order to explore the influence of coal ash and its components on the oxygen carrier of manganese ore during the chemical looping gasification process and their mechanism of effect,Zhaotong lignite was used to prepare coal ash.Single and mixed-component simulated coal ash were prepared with oxide particles such as Fe_(2)O_(3),CaO and MgO,the main components of coal ash.A series of studies have been carried out in a high temperature fluidized bed reactor with steam as the gasification agent.The result shows:after adding 5%(mass fraction)lignite coal ash,the synthesis gas output increases while the carbon conversion rate decreases.With the increased addition of coal ash,the synthesis gas output first decreases and then increases,while the carbon conversion rate increases first and then decreases.When the coal ash addition mass fraction is 15%,the highest carbon conversion rate is 79.7%,and the lowest syngas production is 0.702 L.The Fe_(2)O_(3) component significantly increases the carbon conversion rate and synthesis gas production.The CaO reacted with Mn_(2)O_(3) at high temperature to form Ca_(2)Mn_(2)O_(5),which improves the selectivity of oxygen carrier and increases the production of syngas.The MgO component significantly reduces the carbon conversion rate and synthesis gas production.The study used two-component and MgO-Fe_(2)O_(3)-CaO three-component to simulate coal ash and has found that the inhibitory effect of MgO on the gasification reaction process is stronger than the promotion effect of Fe_(2)O_(3) and CaO.Compared with the two-component Fe_(2)O_(3)-MgO simulated coal ash,the CaO-MgO simulated coal ash has the greatest inhibitory effect on oxygen carrier gasification activity.

关 键 词：化学链气化 锰矿石 煤灰 氧化物 

分 类 号：TQ546[化学工程—煤化学工程]