Analysis and optimal design of an ethylene oxide reactor

In this work, a recently proposed multi-level reactor design methodology (Peschel et al., 2010) is extended and applied for the optimal design of an ethylene oxide reactor. In a first step, the optimal reaction route is calculated taking various process intensification concepts into account. The potential of each reaction concept can be efficiently quantified, which is the economic basis for the design of advanced reactors. Based on these results, a promising concept is further investigated and a technical reactor is designed. As an extension to the design method, reactor design criteria for external and internal heat and mass transfer limitations are directly included in the optimization approach in order to design the catalyst packing. The derived reactor concept is investigated with a detailed 2D reactor model accounting for radial concentration and temperature gradients in addition to a radial velocity profile.The example considered in this work is the production of ethylene oxide which is one of the most important bulk chemicals. Due to the high ethylene costs, the selectivity is the main factor for the economics of the process. A membrane reactor with an advanced cooling strategy is proposed as best technical reactor. With this reactor design it is possible to increase the selectivity of the ethylene epoxidation by approximately 3% compared to an optimized reference case.     

金竹山电厂50MW机组启停调峰试验研究

通过试验分析，金竹山电厂５０ＷＭ机组可采用启停调峰运行方式；提出了一些改进方法和措施；找出了最佳的启停方案。     

Highly active and selective Cu/SiO2 catalysts prepared by the urea hydrolysis method in dimethyl oxalate hydrogenation

Cu/SiO₂ catalysts have been successfully prepared via urea hydrolysis method. The catalysts have been systematically characterized by X-ray diffraction, high-resolution transmission electron microscopy, N₂-physisorption and H₂ temperature-programmed reduction. The results demonstrated the presence of copper nanoparticles and their high dispersion on the SiO₂ support. Catalysts with different copper loadings were prepared, and their performances in the hydrogenation of dimethyl oxalate to ethylene glycol were studied. A 100% conversion of dimethyl oxalate and maximum 98% selectivity of ethylene glycol were reached with 15.6 wt.% copper loading at 200 °C and 2 MPa. Furthermore, under the same reaction conditions, the catalyst can maintain the selectivity of 90% when the reduction temperature reduced from 350 °C to 200 °C. The high activity and selectivity over the catalyst may be ascribed to the homogenously distribution of copper nanoparticles on the large surface.     

乙烯装置先进控制系统应用及其效益

介绍了抚顺乙烯装置在８０年代由美国ＡＢＢＳＩＭＣＯＮ公司引进的裂解炉先进控制系统（ＡｄｖａｎｃｅｄＰｒｏｃｅｓＣｏｎｔｒｏｌ，ＡＰＣ）。在对其深入研究基础上，结合抚顺乙烯裂解炉具体特点，修改了国外软件组态错误，重新设计了主联锁逻辑，完善了控制策略，增加了操作画面，开发了先进控制实时管理功能。该系统１９９５年在抚顺乙烯完成了调试与投用工作。ＡＰＣ运行以来，裂解炉控制质量和装置效益得到明显提高。该项技术在石化行业具有较好的实用性     

锅炉燃烧室湍流流动,燃烧和传热过程的三维全模拟

本文用数值模拟的方法对大型电站锅炉然烧室进行了三维全模拟计算，给出了数学模型和解法，并把计算值和实测值进行了对比。在全面预报燃烧室性能的基础上，对四角切圆燃烧锅炉炉膛出口存在的左右温度和速度偏差问题进行了探讨。     

燃油加热炉二维数学模型

本文应用区域法原理,建立了一种加热炉二维数学模型。该模型考虑了火焰、炉气和炉壁对炉膛热交换的影响,不仅能够计算炉膛的温度场、炉膛给钢坯表面的热流及钢坯的升温过程、温度分布,而且能够给出火焰、炉气、炉体分别对钢坯加热所占份额的大小。运行该模型,可以对实际加热炉生产过程进行仿真计算。     

Emission Source Characterization during an Ethylene Plant Shutdown

To conduct a well‐planned plant shutdown, so as to reduce flare emissions for the sake of plant profitability and local environmental sustainability, one of the primary tasks is to perform comprehensive and precise accountings for flare emissions. Since the literature is still lacking systematic and quantitative studies, plant‐wide dynamic simulations are employed to simulate an ethylene plant shutdown and characterize its flare emission sources through which dynamic emission profiles of various emission species changing with respect to time are obtained. Plant shutdown emission inventories are enriched with details for point emission sources, and possible technical supports are provided to both industry and environmental agencies on evaluating and developing cost‐effective flare minimization strategies in the future.     

中国石油2011年乙烯业务综述

对2011年中国石油乙烯业务发展情况进行回顾和分析,提出2012年的发展目标和重点工作。     

中国石化2011年乙烯业务述评

对中国石油化工集团公司2011年乙烯业务相关情况进行回顾与分析,提出2012年的目标及重点工作。     

络合还原法制备的Pd/C催化剂对甲酸氧化的电催化性能

分别以硼氢化钠和乙二醇为还原剂,经络合还原法制备了炭载钯（Pd/C）催化剂。透射电镜（TEM）和X射线粉末衍射谱（XRD）结果表明,以乙二醇为还原剂制备的Pd/C催化剂中Pd粒子具有较小的粒径、均匀的粒径分布和较大的相对结晶度,Pd粒子的平均粒径和相对结晶度分别为4.2±2 nm和1.88。电化学测试结果显示,以乙二醇为还原剂制备的Pd/C催化剂具有较大的电化学活性面积,对甲酸氧化表现出较高的电催化活性和稳定性。