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Hydrodesulfurization (HDS) of sour crude oil is an effective way to address the corrosion problems in refineries, and is an economic way to process sour crude oil in an existing refinery built for sweet oil. In the current study, the HDS of Siberian crude oil was carried out in a slurry reactor. The Co–Mo, Ni–Mo, and Ni–W catalysts supported on γ-Al2O3 were compared at the temperature of 340 °C and the pressure of 4.5 MPa. The HDS activity follows the order of Co–Mo > Ni–Mo > Ni–W at a high concentration of H2S, and the difference between Co–Mo and Ni–Mo becomes insignificant at a low concentration of H2S. The influence of reaction temperature 320–360 °C and reaction pressure 3–5.5 MPa was investigated, and both play a positive role in the HDS reaction. A kinetic model over Ni–Mo/Al2O3 in the slurry reactor was established. The activation energy is estimated as 60.34 kJ·mol−1; the orders of sulfur components and hydrogen partial pressure are 1.43 and 1.30, respectively. The kinetic parameters are compared with those in a trickle-bed reactor, implying that the mass transfer is greatly enhanced in the slurry reactor. The back mixing effect is present in the slurry reactor and can be reduced by a multi-stage design, which would lead to higher reactor efficiency in industrial application. 相似文献
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本文介绍了乳品厂喷雾干燥物料粘壁的机理、危害以及解决粘壁问题的现状,提出了多段气幕封壁法解决粘壁问题的方案、工作原理、结构及理论计算方法,有助于解决乳品厂生产运行中多年困惑问题。 相似文献
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针对虚拟电厂异构资源的优化组合问题,提出了包含需求响应、柔性可控负荷、分布式电源的响应特性模型。以虚拟电厂对互动资源的控制权限为依据,将互动资源响应电量划分为有、无风险资产,将资源响应计划分配问题映射至投资组合理论中资产权重配置问题,以组合风险衡量用户响应电量不确定性,以预期收益最大为目标建立优化组合模型。在此基础上,利用互动资源的分散性,使虚拟电厂向电网提供阻塞管理,并在CIGRE 20 kV中压配电系统上对所提出方法进行验证。算例结果验证了所提模型的实用性。 相似文献
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High‐Throughput Determination of Statistical Structure Information for Horizontal Carbon Nanotube Arrays by Optical Imaging
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Neural Processing Letters - Deep learning method for 6D object pose estimation based on RGB image and depth (RGB-D) has been successfully applied to robot grasping. The fusion of RGB and depth is... 相似文献
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通过辉光离子渗扩技术对316L奥氏体不锈钢进行了不同温度下的离子渗氮处理,之后采用物理气相沉积技术在渗氮层外表面制备一层CrN涂层,检测不同温度下离子渗氮+物理气相沉积复合涂层的结合力、硬度、耐磨性和耐蚀性,并对其显微组织和物相进行了观测与分析.结果表明:奥氏体不锈钢不同温度渗氮+物理气相沉积复合改性层的组织随渗氮温度的升高从S相(内层)+CrN涂层(外层)转变为不同程度硬质相析出层(内层)+CrN涂层(外层),不同类型的渗氮层与CrN涂层均有良好的结合力;不论是S相层还是硬质相析出层,经过PVD处理后均能在一定程度上提高渗层的表面硬度、耐磨性和耐蚀性,其中耐蚀性随着渗氮温度的升高逐渐变差,硬度和耐磨性随渗氮温度的升高而逐渐提升. 相似文献