烟气干法脱硫工艺是目前主流的烟气脱硫工艺,在运行过程中会产生大量的脱硫副产物.汞是干法脱硫副产物中主要的重金属成分,且具有较强的环境迁移能力.该研究采集了来自GZ电厂与JL电厂应用相同干法脱硫工艺(CFB-FGD)的燃煤锅炉所产生的脱硫灰渣样品,使用自行搭建的双通道管式炉热解-吸收系统收集样品中的汞,并应用原子荧光光谱仪(AFS)与多通道接收MC-ICP/MS分别测定了其中汞的含量以及汞同位素特征.结果表明,双通道管式炉热解-吸收系统比单通道节约40‰的处理时间,标准参考物质NIST 2692c的回收率为(100.7±4.7)‰.样品中汞的含量范围在31.5～406.5 μg/kg之间,均值为168.9 μg/kg (n=20).脱硫灰中δ202Hg数值范围为-1.95‰～1.00‰,△199Hg与△2011Hg则分别为-0.26‰加.12‰与-0.27‰～0.05‰.△199Hg/△201Hg的值约为1.032,接近报道中原煤的数值((1.07±0.04),2SE),表明在干法脱硫工艺过程中,汞元素未发生明显的非质量分馏现象.

In order to analyze the relationship between static and dynamic temperature field distribution of catalyst substrate and various experimental parameters in graphene fabrication with laser-induced chemical vapor deposition , the finite element model was established by using ANSYS software and 532nm laser model was loaded as the heat source .The data of temperature field distribution and the needing time for achieving reaction temperature under different parameters were obtained .The results show that under the influence of the property of substrate , laser power , the size of substrate area , the focus spot diameter and the reaction gas flow , the substrate temperature field distribution and the needing time for achieving reaction temperature are different.It can be used as the reference in high quality graphene fabrication experiment .The dynamic temperature field distribution under the conditions of continuous wave laser (wavelength of 532nm, power of 3W, focused spot diameter of 50μm, movement speed of 1mm/s), nickel foil substrate, 10mL/min methane and 5mL/min hydrogen conforms to the pattern graphene growth mechanism fabricated by laser chemical vapor deposition .

超声相控阵技术应用于工业无损检测,结合DDS技术将更具优势。文中分析了频率合成技术DDS的基本原理与结构,利用可编程逻辑器件FPGA实现了DDS电路;通过超声相控阵发射原理,设计出了单通道超声相控发射系统,并进行了实验分析。