Catalytic coal partial gasification in an atmospheric fluidized bed

The coal partial gasification catalyzed by limestone, sodium carbonate and dolomite was studied using a bench-scale atmospheric fluidized bed in the presence of air and steam at 900 °C. The effects of limestone, sodium carbonate and dolomite on composition, heating value, gas yield of product gas and carbon conversion in the catalytic coal partial gasification have been examined. The experimental results show that the catalysts can effectively improve the gas quality, the heating value and the gas yield of product gas and carbon conversion. The catalytic effect of sodium carbonate is better than that of limestone and dolomite. The increase of limestone loading can enhance the quality of product gas, such as the content of combustible gas, the high heating value and the gas yield, during coal partial gasification. This work was presented at the 6 ^th Korea-China Workshop on Clean Energy Technology held at Busan, Korea, July 4–7, 2006.     

焦化厂煤气管道和设备腐蚀原因及预防

焦化厂煤气管道和设备腐蚀的主要原因有:溶解氧引发的腐蚀、Cl-和SO42-诱发的应力腐蚀、H2S的腐蚀、CO2的腐蚀、铵盐的腐蚀、高浓度悬浮物引发的腐蚀、泥砂和碎片等异物引发的磨损腐蚀、微生物影响诱发的腐蚀及其他介质的腐蚀等。分析了上述腐蚀发生的机理,提出了通过加强生产管理、改善生产工艺、添加缓蚀剂和阳垢剂,做好日常维护等手段,来实现降低腐蚀,延长管道和设备的使用寿命。     

Heat treatment of silica-fiber-reinforced BN-Si<Subscript>3</Subscript>N<Subscript>4</Subscript> matrix composite

A new wave-transparent composite reinforced by silica fibers with a hybrid matrix comprising BN and Si₃N₄ was prepared by precursor infiltration and pyrolysis, and it was heat-treated at elevated temperatures. The variations of the composite during heat treatments were characterized and investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The as-received composite exhibits good mechanical properties, and it is almost amorphous. When treated at 1600°C, it turned brittle, and silica fibers in it were fused; the composite showed a good crystalline form. When treated at 2100°C, the composite broke into pieces, and the composition showed only BN. Si₃N₄ was decomposed, and silica fibers were volatilized. The presence of BN probably affected the phase transitions of silica fibers. __________ Translated from Novye Ogneupory, No. 8, pp. 49–52, August 2007.     

Hydrodynamic characteristics of a FCC regenerator

The hydrodynamic and gas mixing characteristics have been determined in a FCC regenerator (0.48 m I.D.x3.4 m high) with FCC particles. Solids holdup in the dense bed decreases with increasing gas velocity, but it increases in the freeboard region. The bubble/void fraction increases with an increase along the bed height at a given gas velocity and increases with increasing gas velocity at a constant bed height. Backmixed tracer gas at the wall region is higher than that at the center region of the bed. The gas backmixing coefficient decreases with increasing gas velocity.     

运动颗粒团一维连续成像分析系统

本文开发了ＦＬＯＴＵ－Ｉ型多相流径向密度连续测量和成像系统，这一系统采用石英光纤传像束为传感器，通过微机Ｉ／Ｏ控制发光二极管顺序发光，Ａ／Ｄ高速数据采集对传感器进行高速扫描，实现了大视场下两相流的连续测量和成像过程，并将它用于观察分析循环流化床中气固两相流动行为，在内径为１８６ｍｍ的循环流化床内测得了颗粒团图像。     

国库信息系统监控方案的设计

该文以运行在银行端国库信息系统为例,以提高生产运行过程中运维自动化程度为目的,研究了系统运行中的联机交易、批量运行、应用可用性等特点.在对监控需求进行分析的基础上,设计了数据采集层、数据展示层、应用展示层3层系统监控结构,对采集到的运行数据进行处理.通过Web服务器、邮件系统、消息服务平台进行展示和报警,目前该系统设计可以充分满足实际运维需要,保障了国库信息系统的安全正常运行.     

一种优化内容适配技术的设计与实现

针对传统内容适配技术的特点和目前手机浏览器的发展现状,本文提出优先适配浏览器的内容适配技术。在传统内容适配技术上增加uA特征串和Accept特征串作为内容适配参数,并设计浏览器优先终端、终端优先Accept的适配规则。综合网络侧适配和终端侧适配优点,有效优化终端上的内容适配率,使得终端能够动态地、智能地针对不同的手机浏览器适配最佳的浏览版本。     

水性聚氨酯的合成及其改性的研究

研究了 n NCO/n OH、扩链剂 ( BD)及二羟甲基丙酸 ( DMPA)的含量对水性聚氨酯合成及涂膜性能的影响 ,确定了较佳的配方。并利用甲基丙烯酸酯类单体合成聚氨酯 -丙烯酸酯共聚复合乳液来改善水性聚氨酯的性能     

吸收剂量对二甲基硅橡胶与甲基乙烯基硅橡胶分子量和凝胶含量的影响

将ＧＰＣ和特性粘数［η］测定相结合，在室温和－７８℃下，用Ｃｏ~（６０）辐射源辐照，研究了二甲基硅橡胶（ＭＱ，吸收剂量２．０５×１０~３～３．９７×１０~４Ｇｙ）和甲基乙烯基硅橡胶（ＭＶＱ，吸收剂量１０~２～１０~４）分子量和凝胶含量的变化。结果表明，辐照ＭＶＱ较辐照ＭＱ易生成凝胶，在凝胶点前的较低吸收剂量时，溶胶的分子量出现极大值，分子量分布曲线呈单峰；随吸收剂量的增加，分子量分布变窄，分子量降低；出现凝胶的吸收剂量，ＭＱ大约是ＭＶＱ的１０倍。辐照ＭＱ时，凝胶点前的溶胶的分子量分布曲线为双峰，并随吸收剂量的增加，双峰消失，分子量下降；在凝胶点时，分子量出现极大值。     

Apparatus for measuring physical adsorption on intact supported porous membranes

We present a non-destructive, reusable apparatus with which to measure physical adsorption isotherms of intact porous membranes. We developed a two-piece sample container to make reliable sorption measurements of porous membranes, the properties of which may differ from those of powders due to crystal intergrowth. This novel system employs a resealable container that can be immersed in a cryogenic bath, into which tubular, planar, or other porous membranes and films may be placed. Detailed sorption isotherms, including high-resolution adsorption in the low pressure (micropore-filling) region, are shown for MFI-type zeolite membranes grown on two types and configurations of α-alumina support.