Modeling and simulation of steam methane reforming and methane combustion over continuous and segmented catalyst beds in autothermal reactor

In this paper, a numerical analysis of the production of hydrogen via autothermal (ATR) steam methane reforming (SMR) is presented. The combustion reaction occurs over a Pt/Al₂O₃ catalyst, and the reforming reaction is operated using a Ni/Al₂O₃ catalyst inside the same cylindrical channel. A novel configuration with18 catalytic-bed macro-patterns alternately mounted, referred to as SDB, is designed and compared with the catalytic dual-bed reactor (conventional configuration), referred to as CDB, at the same operating temperature and pressure conditions of 900 °C and 14 bars, respectively. The results showed that hydrogen yield was improved by 4.5% compared to the conventional configuration, while a decrease of 67 °C of the highest temperature was noticed. Meanwhile, the methane conversion was 63.73% and 65.44% for the CDB and SDB configurations, respectively. Furthermore, the length of the reactor can be decreased by 27%, keeping the same hydrogen yield at the outlet of the conventional reactor, indicating a potential reduction in hydrogen cost.     

CE7120斜床身车床的数控改造

介绍了一种CE7120斜床身车床数控化改造的方案,包括机械部分改造和电气部分改造。改造后的数控车床在零件的加工精度及加工效率等方面都有明显的提高。     

空气重介流化床干法选煤机的测量和控制方法探讨

从空气重介流化床干法选煤机的工作原理入手 ,阐述了流化床床高和密度的均匀、稳定对分选的重要作用 ,分析了流化床分选过程中的动态平衡机理 ,针对其工艺特点提出了保证流化床床高、密度均匀及稳定的测控方法     

基于双相介质理论的煤层甲烷预测技术

基于双相介质理论研究了双相各向同性介质中的纵波方程，并对煤层甲烷进行地震波动方程的数值模拟．正演得到的叠后记录双相介质的反射波振幅明显弱于单相介质，表现出低频共振、高频衰减及固相位移与流相位移为反相的特性．与地震资料和实际开采资料对比吻合较好．     

气固流化床密度的在线测控研究

在对气固流化床选煤系统被控对象特性分析研究的基础上，提出用逆系统控制方法解决具有非线性多变量特点的气固流化床密度控制问题，建立了相关数学模型，介绍了流化床密度逆控制系统和方法，并获得较好的控制精度。     

矿山陡坡铁路受力分析的有限元方法

考虑矿区线路的实际工况，建立了包括轨道结构和车辆结构的耦合动力系统模型。将线路结构离散为不同的单元，采用能量原理导出了系统动力方程，进一步建立了系统的动力矩阵。得出了车辆走行过程中的轨道位移、速度、加速度等动力响应结果及受力情况，特别对坡度这个影响因素进行了分析。结果表明了有限元方法应用于陡坡铁路计算的正确性和实用性。     

Geostatistical Analysis of Spatial Distribution of Salt Bed Thickness

The data on salt bed thickness distribution are processed using the semi-variogram analysis. Two- and three-dimensional maps of bed thickness distribution, as well as the error maps are presented.     

干扰床分选机分选粗煤泥的规律研究

介绍了干扰床分选机的工作原理,在比较了各种粗煤泥自由沉降速度计算方法的基础上,提出了适用于粗煤泥自由沉降速度的计算公式。筹建了试验室干扰床分选机试验系统,并对新汶矿业集团汶南煤矿不同粒度级别的粗煤泥进行了干扰床分选试验,探讨了干扰床分选机分选粗煤泥的一般规律。     

水泥搅拌桩复合地基机理及实际应用

水泥土桩加固软土地基,一般形成半刚性桩复合地基.从水泥土桩复合地基的构成,对水泥土桩桩身、垫层及桩间土的受力特性及相互作用机理和施工注意事项进行了分析和探讨.