活性炭纤维负载TiO2同时脱硫脱硝实验研究

为实现烟气同时脱硫脱硝,制备了以活性炭纤维(activated carbon fiber, ACF)为载体,TiO2为光催化剂的复合型光催化剂。在自制的光催化反应器上,用可见光为激发光源,进行了同时脱硫脱硝实验,研究了影响光催化剂同时脱硫脱硝的若干因素。实验结果表明,反应温度、烟气湿度、氧气含量等是影响脱硫脱硝光催化的主要因素,利用扫描电镜(scanning electron microscope, SEM)和X–射线电子能谱(energy spectrometer, EDS)分析了反应前后光催化剂的微观性质,利用离子色谱分析了尾气吸收液的成分,探讨了光催化剂脱硫脱硝的反应机理。在最佳反应温度为100 ℃,烟气湿度为0.006 m3/m3时,SO2和NO的脱除效率分别为97.5%和49.6%。     

Heavy paraffin dehydrogenation and hydrogenation of nitrobenzene to aniline: Effects of operating conditions

Auto-thermal heat exchanger configurations are recognized as a novel concept in process intensification. In the current study, the influence of operating conditions in a novel coupling reactor with radial-flow pattern is investigated for heavy paraffin dehydrogenation process. Catalytic hydrogenation of nitrobenzene to aniline takes place in the exothermic side and supplies the necessary heat for the endothermic dehydrogenation of heavy paraffin reaction. The performance of the reactor is numerically investigated for various key operating variables, such as inlet molar flow rates of exothermic and endothermic streams, number of subsections, and exothermic side angle. The reactor performance is analyzed based on temperature, olefin production rate, and nitrobenzene conversion.     

S Zorb装置高负荷运行的措施及效果

中国石油化工股份有限公司广州分公司1.50 Mt/a S Zorb装置自2010年1月10日开工投产以来,出现了反应器过滤器压差高、吸附剂转剂不畅、吸附剂活性下降等影响装置长周期高负荷运行的主要问题,通过使用ME7101高通量滤芯、改造下料流程、提高吸附剂活性等手段,将装置运行周期从过去最高的21.5个月延长到目前的30个月并仍维持正常生产,且负荷最高达110%,2016年每月加工量较2015年增加10~30 kt。     

还原参数对F-T合成Fe-Mn催化剂物相结构的影响

在浆态床反应器中研究了还原气氛和还原压力对微球状FT合成FeMn催化剂织构性质和物相结构变化的影响,结果表明以H2还原后的催化剂比表面积最大,而以合成气或CO还原时,因积炭堵塞孔道,导致催化剂比表面积大幅降低;随还原气氛中CO分压的增大,物相中铁碳化物含量增加,有利于催化剂的还原与碳化;当采用不同还原压力的合成气还原时,催化剂比表面积随还原压力的升高而下降,此外,较高的还原压力使反应器中H2O/H2比增大,导致催化剂中的部分铁碳化物再氧化,因此催化剂中的铁碳化物含量随着还原压力的升高先增加后减少。     

传热传质过程和设备的有限时间热力学优化

1前言能源的短缺与高效利用问题是当代世界各国面临的重大社会问题之一。随着世界人口和经济的迅速增长,能源的消耗急剧地增加,并导致能源的严重短缺。因此,研究充分、高效利用现有能源的方式成为我们目前的重要任务。蒸馏作为全球范围内耗能量最大的工业,引起了很多工程界和物     

反应器形式对异丙苯氧化的影响

在100℃、0.5MPa下,以Na2CO3溶液为稳定剂的异丙苯液相空气氧化反应过程中,当反应时间相同时,在环流反应器内的过氧化氢异丙苯(CHP)浓度和异丙苯氧化速率均高于鼓泡反应器。在常压、85℃的UOP工艺条件下,经过诱导期后,高/径比相对较小的鼓泡槽反应器不用稳定剂比环流反应器和鼓泡塔反应器对异丙苯的氧化反应更为有利。     

A model of wood flash pyrolysis in fluidized bed reactor

With a view of exploiting renewable biomass energy as a highly efficient and clean energy, liquid fuel from biomass pyrolysis, called bio-oil, is expected to play a major role in future energy supply. At present, fluidized bed technology appears to have maximum potential in producing high-quality bio-oil. A model of wood pyrolysis in a fluidized bed reactor has been developed. The effect of main operation parameters on wood pyrolysis product distribution was well simulated. The model shows that reaction temperature plays a major important role in wood pyrolysis. And a good agreement between experimental and theoretical results was obtained. It was shown that particles less than 500 μm could achieve a high heating-up rate to meet flash pyrolysis demand.     

The oxidation of benzene under conditions encountered in waste incinerators

The oxidation of benzene was studied as a function of residence time (τ_res=0–2.5 s), temperature (850–960 K), and oxygen concentration (O₂=0.2–2.3%) in a heated laminar flow reactor at atmospheric pressure. Nitrogen, doped with 350 ppm benzene, was injected downstream of the burned gas from a near stoichiometric flame of methane + air. Gas samples were taken at different heights up the reactor and analyzed using GC-FID/TCD and HPLC techniques. Phenol and partially oxidized hydrocarbons such as acetaldehyde, formaldehyde, and acrolein were found with concentrations up to 50 ppm. At relatively low temperatures, the conversion of benzene was observed to proceed considerably more slowly at higher oxygen concentrations. Measured concentration profiles were modeled using detailed reaction schemes. A modified mechanism for the oxidation of benzene called BenWas was constructed from the mechanism of Zhang and McKinnon (Combust. Sci. Technol. 107 (1995) 261) by incorporating a submechanism for benzoquinone (OC₆H₄O) and by updating and enlarging the reaction scheme of cyclopentadiene (C₅H₆). The agreement between observed and predicted concentration profiles, e.g., of phenol (C₆H₅OH), acetylene (C₂H₂), and carbon monoxide (CO), was considerably improved by the use of the BenWas mechanism for rich and lean conditions, mainly due to the introduction of an additional pathway for phenyl oxidation (C₆H₅ + O₂ = OC₆H₄O + H) and due to the changed kinetics of the oxidation of cyclopentadienyl (C₅H₅) in C₅H₅ + O₂ = C₅H₄O + OH. The measured retardation of benzene oxidation with higher amounts of oxygen can be explained by the formation and reactions of peroxy radicals.     

自励式可控饱和电抗器

简要介绍自励式可控饱和电抗器的线路结构和工作原理，其特点是应用品闸管和续流二级管产生直流偏磁，井可连续平滑控制可控饱和电抗器的负载电流。可控饱和电抗器无需另设直流绕组，也无需产生直流偏磁用的直流电源。