气固下行流化床反应器Ⅱ气固两相的流动规律

气固下行流化床反应器气固两相流动过程是比较复杂的，沿轴向气固两相运动可分为第一加速、第二加速和恒速３个运动段，沿径向局部气体速度、颗粒速度和颗粒浓度都具有不同程度的不均匀性。而这种不均匀性是由气固两相顺重力场湍动运动所决定的。和循环床提升管相比，下行管反应器气固两相沿径向分布的不均匀性得到有效地改善，气固可以实现超短接触操作，因而是一种新型高效气固超短接触反应器     

双峰PE80级管材专用树脂的开发

介绍了高密度聚乙烯管材专用树脂6366M的结构特性、物理性能及其加工应用试验的情况。结果表明，6366M具有相对高的相对分子质量，其相对分子质量分布结构特性呈双峰分布。该材料具有优异的力学性能和耐环境应力开裂性能，而且加工性能较好，实现了刚性和韧性的平衡。成品管材的性能指标可以满足用户的需求。     

毛细管气相色谱法同时测定三磷酸胞苷二钠中5种有机溶剂残留量

研究建立了同时测定三磷酸胞苷二钠中乙醇、丙酮、氯甲醚、甲苯、苯乙烯5种有机溶剂残留量的毛细管气相色谱法。样品以乙腈为溶剂,经DB-FFAP(30 m×0.32 mm×0.25μm)毛细管柱分离,氢火焰离子化检测器检测,这5种有机溶剂呈良好的线性响应,平均回收率在98.3%~99.5%,精密度RSD在0.21%~1.92%,最低检出限可达5.0~7.5 mg/kg。本方法简单、灵敏、准确,完全能满足药品中所述有机溶剂残留量的测定要求。     

Low cost coal-based carbons for combined SO2 and NO removal from exhaust gas

The aim of this paper is to show how a cheap carbonaceous material such as low rank coal-based carbon (or char) can be used in the combined SO₂/NO removal from exhaust gas at the linear gas velocity used in commercial systems (0.12 m s⁻¹). Char is produced from carbonization and optionally activated with steam. This char is used in a first step to abate the SO₂ concentration at the following conditions: 100 °C, space velocity of 3600 h⁻¹, 6% O₂, 10% H₂O, 1000 ppmv SO₂, 1000 ppmv NO and N₂ as remainder. In a second step, when the SO₂ concentration in the flue gas is low, NO is reduced to N₂ and steam at the following experimental conditions: 150 °C, space velocity of 900 h⁻¹, 6% O₂, 10% H₂O, 0-500 ppmv SO₂, 1000 ppmv NO, 1000 ppmv NH₃ and N₂ as remainder.It has been shown that the presence of NO has no effect on SO₂ abatement during the first step of combined SO₂/NO removal system and that low SO₂ inlet concentration has a negligible effect on NO reduction in the second step. Moreover, this char can be thermally regenerated after use for various cycles without loss of activity. On the other hand, this regenerated char shows the highest NO removal activity (compared to parent chars, either carbonized or steam activated) which can be attributed to the activating effect of the sulfuric acid formed during the first step of the combined SO₂/NO removal system.     

在线激光乙炔分析仪在醋酸乙烯合成中的应用

本文介绍了以乙炔和醋酸为原料生产醋酸乙烯合成工艺中进行乙炔在线分析的重要性和传统检测方法的不足。在基于TDLAS技术基本原理的基础上,阐述了激光分析仪的性能特点和系统结构,以及在醋酸乙烯合成装置中乙炔在线检测应用中的优势。实际的应用结果表明,基于TDLAS技术的激光在线气体分析仪可以满足醋酸乙烯合成装置中乙炔浓度检测的应用要求。     

基于zigbee网络的家用燃气报警系统

利用可燃气体传感器NAP-55A、CC2530无线单片机以及相关外围设备等组成智能式家用低功耗可燃气体报警系统,能探测家庭区域可燃气体泄漏,根据用户预先设定的报警值进行声光报警,并能利用zigbee网络技术将报警信息通过多跳的无线方式上传小区监控中心。实验表明:该系统能满足家庭低成本燃气报警的需求,并能融入未来智能家居的应用。     

基于AutoCAD的燃气管网水力平差计算软件的研制

基于燃气管网水力平差计算模型和有限元节点法,利用VC开发语言对AutoCAD进行二次开发,研制出燃气管网水力平差计算软件,该软件实现与AutoCAD图管道信息的交互,能够针对不同压力级别、不同管材组成的多气源枝状管网和环状管网进行水力平差计算。实践表明,该软件操作方便,简单实用,水力平差迭代计算收敛速度快,工作量小,计算准确度高。     

The effect of synthesis gas composition on the Fischer–Tropsch synthesis over Co/γ-Al2O3 and Co–Re/γ-Al2O3 catalysts

The Fischer–Tropsch synthesis over Co/γ-Al₂O₃ and Co–Re/γ-Al₂O₃ was investigated in a fixed-bed reactor at 20 bar and 483 K using feed gases with molar H₂/CO ratios of 2.1, 1.5 and 1.0 simulating synthesis gas derived from biomass. With lower H₂/CO ratios in the feed, the CO conversion and the CH₄ selectivity decreased, while the C₅₊ selectivity and olefin/paraffin ratio for C₂–C₄ increased slightly. The water–gas shift activity was low for both catalysts, resulting in high molar usage ratios of H₂/CO (close to 2.0), even at the lower inlet ratios (i.e. 1.5 and 1.0). For both catalysts, the drop in the production rate of hydrocarbons when shifting from an inlet ratio of 2.1 to 1.5 was significant mainly because the H₂/CO usage ratio did not follow the change in the inlet ratio. The hydrocarbon selectivities were rather similar for inlet H₂/CO ratios of 2.1 and 1.5, while significantly deviating from those for an inlet ratio of 1.0. With the studied catalysts, it is possible to utilize the advantages of an inlet ratio of 1.0 (higher selectivity to C₅₊, lower selectivity to CH₄, no water–gas shifting of the bio-syngas needed prior to the FT reactor) if a low syngas conversion is accepted.     

2,6-二异丙基环己胺馏分测定

建立了馏分中 2 ,6 二异丙基环己胺的气相色谱方法。在弱极性的毛细管色谱柱上、1 1 0℃下用面积归一法测定 ,方法标准偏差为 0 .1 3 ,变异系数为 0 .40 % ,与化学法比较 ,相对偏差小于 2 %。     

搬运机器人在钻杆生产线物料输送系统中的应用

针对钻杆生产线中物料输送的特点和难点,设计了基于搬运机器人的智能输送系统,介绍了系统的组成、工作流程、以及Profibus总线配置。调试表明,该系统能够满足搬运物料的设计目的,对提高生产效率具有较高的应用价值。