论文部分内容阅读
在φ44的流化床反应器中用空气对FeCl2·4H2O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FeCl2·4H2O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,FeCl2·4H2O晶体煅烧生成的Fe2O3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。FeCl2·4H2O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。FeCl2·4H2O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。
In fluidized bed reactor φ44 fluidized FeCl2 · 4H2O crystals were calcined, the use of chloride ion selective electrode determination of chloride concentration in the exhaust gas absorption solution, obtained FeCl2 · 4H2O calcination reaction rate changes with the reaction time The influence of superficial gas velocity, average crystal size and bed temperature on the fluidization calcination process was investigated. The results show that Fe2O3 formed by calcination of FeCl2 · 4H2O crystals has loose texture and peels off from the surface of the particles in the fluidized state, which leads to a calciner similar to the granulation reaction. FeCl2 · 4H2O crystals fluidized calcined, the apparent gas velocity increased, the reaction rate increased, the calcination time was shortened, the apparent air velocity of 0.64m / s outside the basic elimination of diffusion, and then increase the apparent air velocity on the calcination reaction did not affect Obviously, the process is controlled by surface reaction. The smaller the initial average particle size of FeCl2 · 4H2O crystals, the more obvious the reaction rate changes with time, and the shorter the time for completing the calcination reaction. The bed temperature has a significant effect on the calcination reaction, and the calcination reaction is proportional to the particle surface area.