膨润土负载型低铜含量甲醇制氢催化剂的制备及其性能

以膨润土为载体,采用浸渍法制备了低铜含量负载型CuO/膨润土催化剂,考察了铜含量对催化剂物化性能和甲醇制氢反应性能的影响.结果表明,铜含量对催化性能有显著影响,随铜含量的增加,甲醇转化率和CO选择性均呈现出先升高后降低的趋势,在铜含量为13.8wt％时,甲醇转化率为84.7％,一氧化碳选择性为92.5％.CuO/膨润土...     

浅议我国超细碳酸钙生产现状、问题及对策

阐述了我国超细碳酸钙生产现状和存在问题，提出了解决这些问题的对策措施。     

炭粒床高效工业除尘装置的设计与开发

The new dust removal technical route using the carbon-granular bed filter,packed of carbon particles with appropriate grade derive from an online-process vibration sieve,to replace the traditional baggy filter had been developed successfully for capturing the micro-carbon dusts produced from pulverization of petroleum coke,and the green close loop of carbon materials is thus completed in the combined pulverizing and classifying system and pulverized carbon dust removal process.The high dust removal efficiency greater than 99%,low outlet dust concentration less than 100 mg.m-3,low pressure drop through dust filtration chamber less than 980 Pa,simple and easy design,and flexible and stable operation were achieved also with the carbon-granular bed filter in both bench and industrial scale operations.     

A Sedimentation-Dispersion Model for both Non-attached and Attached Particles in Three-Phase Batchwise Fluidized Beds

The axial concentration distribution of both particles with better wetting (forming non-attached system) and poorer wetting (forming attached system) was investigated in a vertical gas-liquid-solid fluidized bed of 4.2 cm in diameter and 130 cm in height with the solids holdup less than 0.05. The one-dimensional sedimentation-dispersion model could be used satisfactorily to describe the axial distribution of solids holdup by modifying only a model parameter, i.e. by means of the terminal settling velocity minus a certain value, which is a function of gas velocity and considers the effect of an additional drag force resulted from attached rising bubbles. The axial profiles of solid concentration predicted are in good agreement with experimental results. This model also explains reasonably the different axial distributions of solid concentration, i.e. the solids holdup decreases as the axial height increases in non-attached system, but increases with the axial height in attached system at a given gas veloc     

精煤降灰的节能效果

钢铁企业系统节能的重大战略措施是推行精料方针,炼铁行话曰:“七分精料,三分操作”,是很有道理的.炼铁高炉炉料中的杂质基本上都成为高温液态渣排出炉外,炉渣所带走的热约占高炉总热耗的16%左右,而高炉热量的绝大部分是源自焦炭,渣多必然多耗焦,渣多所夹带     

面向终端用户动态构造企业MIS

本文简要论述了企业管理对MIS的要求以及企业管理需求的特点，提出了面向终端用户动态构造企业MIS的方法——SY方法。以适应企业管理不断发展变化的需求，介绍了SY方法的主要目标、基本原则以及基于SY方法开发企业MIS的特点和过程等。     

基于SY方法的MIS开发与实现

该文简要介绍了ＳＹ方法的基本思想，包括基于ＳＹ方法的ＭＩＳ开发模式，ＭＩＳ体系结构以及集成开发环境等；分析了在用户需求基础上设计数据字典和功能说明的内容及积术块的设计原则和设计步骤；讨论了应用系统的定义，动态构造和实现过程以及系统维护和动态调整方法；特别强调了面向对象技术和软件重用性在ＳＹ方法中的作用。     

新余钢铁厂炼焦精煤合理灰份值的优选计算

炼焦精煤的灰份含量应该有一个合理的取值。从炼焦、炼铁的角度出发,灰份越低越好。从煤矿和洗煤厂的角度出发,过多地降低灰份又会使精煤回收率下降,洗精煤成本升高。这个矛盾应该在有利于整个国民经济的基础上加以统一,应该兼顾权衡两者的     

惰性粒子喷动床中制备超细碳酸钙的实验与建模

A novel reaction-drying process was carried out in a spouted bed reactor with inert particles and used to prepare ultrafine CaCO3 particles. Effects of concentrations of CO2 and Ca(OH)2, and reaction temperature on Ca(OH)2 conversion were experimentally investigated. The particle sizes and composition of CaCO3 produced were characterized with transmission electron microscopy (TEM) and X-ray diffraction (XRD). The results indicated that ultrafine CaCO3 particles with mean size of 80 nm could be obtained with this novel process.By modifying the Arrhenius Equation and considering the Ca(OH)2 state, a kinetic model was established to describe the process in the spouted bed. The model parameters estimated from the reaction-drying experiments were found to fit well the experimental data, indicating the applicability of the proposed kinetic model.