磨煤干燥装置气力输送系统与螺旋输送机的对比

磨煤干燥装置中,最终制备出来的合格煤粉产品输送到气化装置。目前国内普遍采用的方式为螺旋输送机或者气力输送系统,本文针对两种煤粉输送方式进行了对比。     

磨煤干燥系统优化研究

针对磨煤干燥系统进行模拟分析,利用ASPEN PLUS程序对其进行模拟计算,并确定主要参数。可以合理的预测到在整个系统中影响关键组分浓度的最重要的因素。原煤预干燥工艺技术可以运用到磨煤干燥过程中,可相应的降低热风炉原料气消耗,降低能耗。系统运行中可以取消稀释风机,单独利用燃烧风机调节系统中氧含量以及水露点等主要参数。     

Shell炉磨煤和干燥系统磨煤机常见问题分析

对sheu煤气化工艺磨煤干燥系统流程及磨煤干燥系统主要设备磨煤机进行简介,对磨煤和干燥系统磨煤机常见的堵煤问题进行工艺和设备方面的分析,提出了相应的对策措施,解决问题使装置达到稳定运行。     

磨煤干燥过程安全系统及环境因素分析

针对磨煤干燥系统中的部分流程工序进行优化分析,对目前比较注重的环保问题得出较为优化的方案.     

Shell粉煤气化装置磨煤及干燥单元优化分析

主要以某Shell 4×3 000 t/d粉煤气化项目磨煤及干燥单元为基础,对原设计工艺流程提出了一些优化建议,可为后续类似项目提供一些可供借鉴的经验。     

SHELL煤气化磨煤干燥系统运行分析

阐述了Shell煤气化工艺磨煤干燥系统流程,磨煤干燥系统主要设备循环风机和磨煤机进行了介绍,分析了Shell煤气化磨煤干燥系统试车及运行过程中实际遇到问题及解决措施。     

基于Aspen Plus软件的磨煤干燥过程模拟与分析

运用Aspen Plus软件对磨煤干燥过程进行模拟与分析,可以比较准确地知道CMD工段的燃料气、低低压氮气、助燃空气、稀释空气、电力等公用工程的消耗,优化干燥工艺流程,为工程设计和生产操作提供指导。     

壳牌煤气化磨煤干燥系统设备故障研究

本文主要分析了壳牌煤气化磨煤干燥系统工艺的原理,重点分析现阶段系统设备存在的故障,并提出相应的处理措施。通过对壳牌煤气化磨煤干燥系统设备故障的研究,能够更加有针对性的解决系统设备在运行过程中会出现的问题,以提高煤矿生产的效益为目标,创造出更大的经济效益。     

煤粉气化装置中的磨煤干燥系统设计概要

介绍了国内煤粉气化装置中磨煤干燥系统的生产工艺流程,针对磨煤干燥的特点与电厂燃煤锅炉制粉和冶金行业的高炉煤粉喷吹制粉系统进行了比较,并对磨煤干燥采用的设备选型进行了论述。     

Shell煤气化磨煤干燥系统常见问题分析及解决

阐述Shell煤气化工艺磨煤干燥系统流程,磨煤干燥系统主要设备循环风机和磨煤机进行简介,Shell煤气化磨煤干燥系统试车及运行过程中实际遇到问题的原因浅析及采取相应措施解决问题达到稳定运行目的。     

壳牌气化炉磨煤及干燥系统常见问题分析

介绍了壳牌粉煤气化装置磨煤干燥系统的工艺流程;分析了称重给煤机、磨煤机和循环风机出现问题的原因;提出了相应的处理措施。     

壳牌煤气化磨煤干燥系统设备故障分析及处理

神华煤直接液化项目采用壳牌煤气化装置。介绍了壳牌煤气化装置磨煤干燥系统的工艺原理和工艺流程;分析了磨煤机、称重给料机、循环风机、助燃空气风机、煤粉收集器、碎煤仓的故障原因,提出了相应的处理措施和技改方案。     

Influence of coal characteristics on CO2 gasification

The rate of CO₂ gasification of a coke is one of the most important qualities of metallurgical coke. Many workers are trying to estimate the rate of CO₂ gasification of coke by studying properties of coal, such as the reflectance of vitrinite and the amounts of inertinite and ash in coal. The specific-gravity separation method is used to prepare coals which possess almost the same reflectance, but contain different amounts of inertinite and ash. The relation between the rate of gasification and the properties of coal is quantitatively explained.     

Significant parameters in the catalysed CO2 gasification of coal chars

Alkali and alkaline earth carbonates have been used to catalyse the C0₂ gasification of coal chars prepared by pyrolysis of Illinois No.6 coal. This study found that alkaline earth carbonates are fair gasification catalysts, though throughputs are insensitive to loadings in the range of 5–20 wt%. The order of efficacy is Ba > Sr > Ca. Alkali carbonates are excellent catalysts, with throughputs showing a dependence on loadings and atomic number. In particular, at high loadings (20 wt%) the order is Cs > K > Na > Li. As kinetic parameters for the alkali carbonate catalysed Boudouard reaction with coal chars differ significantly from those for graphites, an alternative redox cycle mechanism has been proposed involving an alkali hydride intermediate.     

Drying of resorcinol-formaldehyde gels with CO2 medium

The effect of using real supercritical conditions in the CO₂ drying process on the structure and texture of resorcinol-formaldehyde networks is investigated by low temperature nitrogen adsorption, scanning electron microscopy and by small and wide angle X-ray scattering. If supercritical conditions are maintained throughout the whole extraction process the resulting networks exhibit much more developed porosity. The surface area of the supercritically dried gel, in excess of 500 m²/g, is more than twice that of the sample dried with liquid CO₂. Pore volumes are also significantly higher in all pore classes. In the supercritical region the applied pressure strongly affects the porosity, while the effect of temperature is limited. Drying time also influences the total pore volume of the samples, but not the mesopore and micropore volumes. The volume filling character of the molecular adsorption process in this system is illustrated by the difference in surface areas measured by small angle X-ray scattering and that by nitrogen adsorption.     

CO2和CH3OH直接合成碳酸二甲酯催化剂研究进展

碳酸二甲酯是一种绿色的有机合成中间体,由CO2直接合成碳酸二甲酯备受关注。本文介绍了CO2和CH3OH直接合成碳酸二甲酯的各种催化剂,分析了催化剂的优缺点,探讨了催化反应的机理。同时介绍了合成碳酸二甲酯的新技术和新方法。最后指出了由CO2直接合成碳酸二甲酯的研究趋势。     

CO2吸附活化及催化加氢制低碳烯烃的研究进展

随着工业化的发展,CO2的排放与日俱增,给环境带来了不可忽视的严重后果。同时,石油资源日渐匮乏,使得以石油为原料制低碳烯烃的工业面临严峻的挑战。利用CO2制低碳烯烃是缓解环境与资源双重压力的有效途径之一。本文综述了CO2催化加氢制低碳烯烃的热力学分析,CO2在过渡金属单晶和氧化物表面的吸附活化机理以及CO2催化加氢制低碳烯烃催化剂的研究进展。分析比较了包括单金属催化剂、双金属催化剂和复合催化剂在内的CO2制低碳烯烃催化剂的优缺点。提出了催化反应过程中存在催化剂难以兼顾选择性和转化率的技术难题,并指出了今后的主要研究方向是加强催化反应机理和催化剂制备、改性技术的研究。     

Supercritical CO2 dispersion of nano-clays and clay/polymer nanocomposites

Dispersed polymer/clay nanocomposites are of great interest because they can significantly improve the properties of existing polymeric materials. However, achieving a high level of clay dispersion has been a key challenge in the production of polymer/clay nanocomposites. In this paper, we explore a novel supercritical carbon dioxide (scCO₂) processing method that utilizes scCO₂ to disperse nano-clays. The structure and properties of the clays and the resultant nanocomposites are characterized using a combination of wide-angle X-ray diffraction (WAXD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and rheology. Significant dispersion was achieved with dry Cloisite 93A clay, whereas relatively poor dispersion was achieved with dry Cloisite Na⁺ (natural clay). The extent of clay dispersion appears to be dependent on the ‘CO₂-philicity’, which in turn appears to depend on the surface modifications and inter-gallery spacing. The presence of an acidic hydrogen on the surfactant in Cloisite 93A appears to play a strong role in its ‘CO₂-philicity’. The ability to delaminate dry clays is significant because it will likely increase the ability to produce dispersed clay/polymer nanocomposites via melt processing. In addition to delaminating dry clays, we demonstrate that CO₂-phobic Cloisite Na⁺ (natural clay) can be partially dispersed with scCO₂, using a CO₂-philic polymer, polydimethylsiloxane (PDMS). The dispersed clay/PDMS nanocomposite shows an order of magnitude increase in the dynamic storage modulus at low frequencies, accompanied by the emergence of a ‘solid-like’ plateau, characteristic of dispersed nanocomposites with enhanced clay/polymer interactions.     

有机胺改性MCM-41吸附富集CO2

采用浸渍法分别将二乙烯三胺(DETA),二乙醇胺(DEA),乙醇胺(MEA),三乙烯四胺(TETA),羟乙基乙二胺(AEE)负载到MCM-41介孔硅材料上,制成各种吸附剂,考察不同胺负载量的吸附剂对CO2的吸附和再生性能;结果表明质量负载量为50%的AEE/MCM-41吸附效果最佳,在80℃下具有很好的再生性能。