澳大利亚SINO铁矿提质扩能探索研究

介绍了SINO铁矿的建设与运行现状,研究了扬州泰富特材利用SINO铁精粉完成提质降杂项目,证明了SINO铁矿采用淘洗磁选的全磁流程的可能性;分析了SINO铁矿运行自磨机和球磨机扩能的可能性;利用各种试验和现场运行数据进行分析计算,模拟出在3种扩能提质情况下SINO铁矿的综合选矿指标。     

以动态发展为策略的汾湖镇中心城区城市设计

该文以吴江市中心城区城市设计为例,具体说明了建设"新型水乡都市",既突出江南水城独有的岁月,又不失现代化新城镇气魄的规划思路,并着重分析了城市设计需重点处理的几个关系。     

DCS和PLC控制系统升级改造分析

总结和分析大型化工装置DCS和PLC的改造升级过程,结合合成氨、尿素装置的经验,分析改造中注意事项和难点,提出解决问题的办法,并进一步评价改造效果。     

Modelling and parameter estimation of ultra-dispersed in situ catalytic upgrading experiments in a batch reactor

In situ catalytic upgrading of heavy oil and bitumen has been suggested and tested in the laboratory for utilization of heavy oil resources. Experimental observations have demonstrated potential, so this innovative recovery technique may have a role in the development of large resources of heavy oil and bitumen. Accurate analytical and numerical modelling is necessary in order to correctly interpret experimental measurements of the in situ upgrading, leading to a better understanding and design of field-scale processes. In this paper, we present modelling and parameter estimation for ultra-dispersed catalytic upgrading experiments conducted in a batch reactor. The Monte Carlo simulation technique was used to estimate the most appropriate reaction parameters. The combination of an analytical batch reactor model and the Monte Carlo simulation technique allows for the fast generation of a large number of upgrading experiment realizations. Comparisons of analytical modelling results with the experimental measurements of the upgrading experiments at different temperatures are in close agreement. Results reveal that ultra-dispersed catalytic upgrading in a batch reactor results in a fairly high residue conversion and can potentially increase the API gravity of the produced oil.     

浆态床重油改质技术新进展

浆态床加氢工艺是一种重要的劣质重油/渣油轻质化技术,随着原油的劣质化和产品的清洁化,其重要性凸显,各大石油公司均大力研究和开发。本文重点介绍了典型浆态床加氢工艺(包括Eni公司的EST、Chevron公司的VRSH、UOP公司的UniflexTM等)的技术特征和进展情况。在详细分析浆态床加氢反应机理的基础上,指出了其未来的研究方向:研究重油反应过程的胶体稳定性以控制生焦;开发新型高效催化剂以降低成本;研究浆态床反应器流体力学和传质特性以指导工程放大。     

褐煤提质技术现状

分析了国内外褐煤提质技术的发展现状,介绍了几种典型的褐煤提质工艺,并对国内褐煤提质技术的发展方向进行了探讨。     

褐煤汽爆提质新方法

利用汽爆方法对内蒙褐煤进行了汽爆粉碎和改质初步研究,考察了汽爆设备、工艺条件和汽爆效果,同时进行了汽爆工艺条件对褐煤改质的影响。结果显示,单次汽爆过程对褐煤具有明显的粉碎效果,汽爆过程对褐煤具有显著的改质作用。停留1h,随着汽爆温度的提高,褐煤水分降幅达63．6％,挥发分降低11．3％,氧质量分数降低48％,含碳量提高了12．9％,褐煤质量得到明显改善。     

Effects of HZSM-5 crystallite size on stability and alkyl-aromatics product distribution from conversion of propanal

The conversion of propanal on large (2–5 µm) and small (0.2–0.5 µm) crystallite HZSM-5 at 400 °C and atmospheric pressure has been studied. Improved catalyst stability was observed on small crystallites due to faster removal of products with the shorter diffusion path length, reducing the formation of coke precursors. As previously shown, C₉ aromatics are the initial aromatics produced from propanal via aldol condensation followed by cyclization and these have less opportunity to crack to lighter aromatics on the small crystallites. Thus, a higher ratio of C₉/(C₈+ C₇) aromatics was observed on the small crystallites. The main isomer of the C₈ aromatic products observed on small crystallites was the initial cracking product of the C₉ aromatics, and thermodynamically preferred, meta-xylene, while the shape-selective preferred para-xylene was the predominant product on large crystallites. The higher internal diffusion rate of the para isomer results in greater shape selectivity with the longer path of the large crystallite zeolite. It is concluded that the use of smaller crystallite HZSM-5 improves results for production of alkyl aromatics from light oxygenates at mild conditions that may prove useful for bio-oil upgrading.     

污水处理厂提标改造措施选择与工程实践

通过提标改造和扩建,某污水处理厂的处理能力从2.5×104 m3/d提高至5.0×104m3/d,出水水质由一级B标准提高至一级A标准。通过将常规A2/O工艺改造为倒置A2/O工艺、优化工艺运行、局部改造和增加深度处理设施等措施,对BOD5、SS、NH3-N和TP的去除率分别达到95.0%、96.2%、82.1%和90.4%,出水水质达到一级A标准。详细介绍了提标改造内容及采取的措施,可为类似工程的设计提供参考。     

天津开发区第一污水厂升级改造工艺的选择与分析

随着国家和地方对城镇污水处理厂污染物排放标准的逐年提高,已经建成的很多污水处理厂均面临升级改造,如何确定改造工艺是众多设计人员面临的严峻问题。以天津开发区第一污水处理厂升级改造工程为例,在处理规模不能减量及用地受限等约束条件下,分析探讨了污水处理厂升级改造工艺的选择要点。指出,对污水处理厂的升级改造需充分挖掘现有工艺的潜力,结合工程投资、运行成本、工程周期、处理效果等,根据具体情况确定改造工艺。