循环的存储-放电等离子体催化新过程脱除室内空气中甲苯

引言 室内空气中的挥发性有机化合物(VOCs),如甲醛(HCHO)、苯(C<,6>H<,6>)、甲苯(C<,7>H<,8>)等,是一类对人体有极大危害的室内空气污染物[1-2].传统的脱除VOCs的方法有吸附法、催化氧化法、热焚烧法等,这些方法在经济上或处理效率上或多或少存在缺陷.用于室内空气中VOCs脱除的理想方法应该同时具备脱除效率高、室温脱除、操作简单、能耗低及无二次污染物等特点.     

微波等离子体中OH自由基的光腔衰荡光谱诊断

搭建了一套以可调谐半导体激光器为光源的连续波光腔衰荡光谱装置,将其与微波等离子体装置结合,对等离子体中的OH自由基进行了原位定量测量,同时考察了OH自由基数密度随气压和微波功率的变化情况.实验结果表明:以氮气为工作气体,在(0.66～3.99)×103Pa范围内,随着气压的升高,OH自由基数密度先增加后降低,在1.995×103Pa时达到最大值;随着微波功率的升高OH自由基数密度逐渐增加.     

气相色谱法评价脉冲电晕等离子体条件下甲烷脱氢偶联反应

用气相色谱法对脉冲电晕等离子体条件下的甲烷脱氢偶联反应进行评价，采用改性硅胶性氢火 焰检测器，对反应产物进行分离分析，获得了较好的效果。     

介质阻挡放电等离子体中HO2自由基的红外光腔衰荡光谱原位诊断

建立了一套以可调谐半导体激光器做光源的连续波光腔衰荡光谱装置，简单介绍了连续波光腔衰荡光谱技术与脉冲光腔衰荡光谱技术的区别。将连续波光腔衰荡光谱技术与介质阻挡放电等离子体技术相结合，对等离子体中的HO2自由基进行了原位定量测量，同时考察了HO2自由基数密度随放电电压和体系中氧气含量变化情况。实验结果表明：随着放电电压和体系中氧气含量的增加而增加的HO2自由基数密度分别出现极大值。     

Improved Double-Probe Technique for Spatially Resolved Diagnosis of Dual-Frequency Capacitive Plasmas

The conventional double-probe technique was improved with a combination of selfpowering and radio-frequency(RF) choking.RF perturbations in dual-frequency capacitively coupled discharge were effectively eliminated,as judged by the disappearance of self-bias on the probes.The improved technique was tested by spatially resolved measurements of the electron temperature and ion density in both the axial and radial directions of a dual-frequency capacitive plasma.The measured data in the axial direction were compared with simulation results,and they were excellently consistent with each other.The measured radial distributions of the ion density and electron temperature were influenced significantly by the lower frequency(LF) power.It was shown that superposition of the lower frequency to the higher frequency(HF) power shifted the maximum ion density from the radial center to the edge region,while the trend for the electron temperature profile was the opposite.The changing feature of the ion density distribution is qualitatively consistent with that of the optical emission intensity reported.     

万吨线回转窑衬瓦的选材和生产控制

<正>0前言伴随着新型干法水泥生产技术在我国的推广、普及和发展,十多年来,新型高铝锌基合金衬瓦已被大家所熟知并接受;它作为铝青铜衬瓦的替代品,其更高的可靠性、更长的使用寿命和更具竞争力的价格,早已成为业内共识。但是,作为水泥回转窑的重要组成部分即支撑装置的关键组件,其质量的优劣和稳定,至今仍是设计人员和质量控制人员乃至业主非常关心的重大问题,特别是在大型回转窑项目上更是如此,疑虑和担心在部分管理者中     

GIS技术在建立数字地面模型和路线CAD中的应用研究

针对公路勘测设计一体化的特点与要求 ,论述应用GIS技术采集公路地面数据和建立数字地面模型的方法 ;研究MapGIS系统在公路选线和CAD中的应用。在分析地理信息系统与公路勘测设计关系的基础上 ,根据我国公路路线设计CAD发展的实际情况 ,提出基于MapGIS平台进行公路路线设计应用软件开发的建议。     

纯碱生产分离技术的探讨

文章介绍了纯碱生产过程中的几种分离技术,分析了各自的技术原理、运行参数并做了相应的技术比较。     

供热计量实施中亟待解决的问题

分析目前热计量实施中存在的现象,提出了两个急需解决的问题,即热网的节能调控问题和科学合理热价的制定问题,分析这两个问题产生的原因及解决途径.     

Oxygen-Free Conversion of Methane to Ethylene in a Plasma-Followed-by-Catalyst （PFC） Reactor

Oxygen-free conversion of methane to ethylene was investigated in a two-stage plasma-followed-by-catalyst （PFC） reactor. In the absence of catalyst, pulsed spark discharges and pulsed corona discharges were compared for methane conversion. The results showed that methane was mainly converted to acetylene, but pulsed spark discharges exhibited distinct advantages over the pulsed corona discharges in methane conversion. Thereby, pulsed spark discharges were employed and followed by Ag-Pd/SiO2 catalyst for achieving ethylene as a target product in the PFC reactor. Using the PFC reactor, a steady single-pass ethylene yield of 57% was obtained at a rate of methane conversion of 74%.