FeCl2·4H2O晶体流态化煅烧过程实验研究  

Experimental study on the fluidized calcinations of FeCl_2·4H_2O crystals

作　　者：王玲[1] 郑燕萍[1] 程榕[1] 杨阿三[1] 孙勤[1] 张许力 WANG Ling;ZHENG Yanping;CHEN Rong;YANG Asan;SUN Qin;ZHANG Xuli(Zhejiang Key Laboratory of Bio Fuel Utilization Technology,School of Chemical Engineering and Technology,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China)

机构地区：[1]浙江工业大学化学工程学院,浙江省生物燃料利用技术研究重点实验室,浙江杭州310014

出　　处：《化工进展》2017年第9期3189-3194,共6页Chemical Industry and Engineering Progress

摘　　要：在φ44mm的流化床反应器中用空气对FeCl_2·4H_2O晶体进行流态化煅烧,采用氯离子选择电极测定尾气吸收液中氯离子浓度,得到FeCl_2·4H_2O煅烧反应转化率随反应时间的变化关系,考察表观气速、晶体平均粒径和床层温度对流态化煅烧过程的影响。研究结果表明,FeCl_2·4H_2O晶体煅烧生成的Fe_2O_3质地疏松,在流化状态下自颗粒表面剥落随气流带出煅烧炉,类似缩粒反应过程。FeCl_2·4H_2O晶体流态化煅烧,表观气速增大,反应速率加快,煅烧时间缩短,表观气速达0.64m/s外扩散影响基本消除,再增大表观气速对煅烧反应影响不明显,过程为表面反应控制。FeCl_2·4H_2O晶体初始平均粒径越小,反应速率随时间的变化越明显,完成煅烧反应的时间越短。床层温度对煅烧反应影响显著,煅烧反应与颗粒表面积成正比。The FeCl2·4H2O crystals were fluidizely calcinated by air in aφ44mm fluidized bed reactor.The process of producing Fe2O3by FeCl2·4H2O using fluidzed calcination was studied.The conversion of FeCl2·4H2O crystals with reaction time was obtained by measuring the chloride ion concentration in tail gas absorption solutions with chloride ion selective electrode,and process influence factors was investigated,including superficial gas velocity,average grain diameter and bed temperature.The result indicated that the fluidzed calcination was surface reaction controlled process.Apparent gas velocity was increased,the reaction rate was accelerated,the calcination time was shortened.When the apparent gas velocity at0.64m/s,the external diffusion was eliminated,and the reaction was controlled by surface reaction.Then,increasing the apparent gas velocity had no obvious effect on the calcination reaction.The generated Fe2O3was loose,and it was peeled off the surface of the particles as well as flowing out of the furnace with air by calcining FeCl2·4H2O crystals in fluidization state,which was similar to the shrinking reaction process.The FeCl2·4H2O crystals'temperature rising rate and calcination reaction rate speed were accelerated with the increase of apparent gas velocity in the environment of fluid-bed calcination.However,the increasing of superficial gas velocity has no obvious effect on the calcination reaction in the environment of good fluidization.The smaller of the FeCl2·4H2O crystals'initial average particle size,the variation of reaction rate with time was more obvious,and the completing time of the calcination reaction was shorter.The bed temperature has a significant effect on the calcination reaction,and the calcinations reaction is proportional to the particle surface area.

关 键 词：四水氯化亚铁 流态化 煅烧 

分 类 号：TQ138.11[化学工程—无机化工]