振动流化床中氢气还原分解磷石膏

在振动流化床中对氢气还原分解磷石膏反应进行了研究,考察了氢气体积分数、反应温度、气体流量、床层高径比及反应时间对磷石膏分解反应的影响.结果表明:随着氢气浓度升高,分解率有增大趋势,但脱硫率先增加后减少;反应温度越高以及物料高径比越小,分解率与脱硫率越高;过高或过低的气体流量都不利于磷石膏的分解,当气体流量为242 mL/min时,分解率与脱硫率最高;并且反应时间越长,磷石膏分解越充分,但应设定范围.当还原分解温度1 050℃,氢气体积分数为5%,物料高径比为1.2,气体流量为242 mL/min(u=20 umf),反应时间为60 min,磷石膏的分解率与脱硫率分别能达到98.78%和84.24%,能满足磷石膏制酸联产水泥的要求,可用于指导磷石膏还原分解制酸联产水泥的新工艺研究.     

The effect of swirling flow on elutriation in a vortexing fluidized bed

The elutriation of fine particles in a vortexing fluidized bed (VFB) was studied by a batch and binary system. The diameter of the coarse particles was 545 Μm, and the diameter of the fine particles for the elutriation test was 81, 97, 115, 137, 163, and 193 Μm, respectively. It was found that the swirling flow caused by the secondary air injection is the dominating factor to influence the elutriation rates. The effect of primary air velocity, swirling flow, injection angle of secondary air nozzle, and diameter of fine particles on the elutriation rate constant was also studied. The Taguchi experimental method and Regular analysis are used to identify the effects of various operating variables. A correlation was developed to estimate the specific elutriation rate constant (K _∞ ^* ) in the vortexing fluidized bed. The specific elutriation rate constant (K _∞ ^* ) was found to be a function of the primary air velocity, the diameter of fine particles, the secondary air velocity, and the height of secondary air injection.     

电压反馈和电流反馈运算放大器的比较

从闭环特性、开环特性、输入级、噪声等几个方面，对电流反馈(CFB)放大器和电压反馈(VFB)放大器进行了详细的比较，得出了CFB放大器和VFB放大器的一些基本特性和应用场合。通过对这两种电路的比较，有助于电路设计师在实际应用中选择最适合自己要求的运算放大器。     

计及大规模全钒液流电池储能系统外特性建模与仿真

研究了全钒液流电池(VFB)储能系统外部运行特性,基于VFB电化学性质开展了储能系统(ESS)建模仿真工作。系统地分析储能系统实际运行数据并评估其过载运行对调度控制的影响,对荷电状态(SOC)、电动势以及等效电阻等关键参数进行拟合并得到函数关系。在此基础上,以戴维南等效电路作为仿真模型主电路,控制模块计算状态参量的变化值,并以受控源和受控电阻的方式将状态参量变化实时反馈到主电路,同时将储能系统过载运行的运行特点嵌入到所建模型中。最后,通过Matlab/Simulink搭建所提模型并仿真运行。仿真运行结果与实测数据对比表明该模型可有效描述储能系统运行外特性,具有较高的工程应用价值。