Ф159mm热轧无缝钢管厂穿孔机顶杆脱出装置的设计

针对某厂Ф159mm热轧无缝钢管生产线投产以来,顶杆脱出装置的夹送链装置频繁出现断裂故障、严重影响正常生产的问题,提出了一种不做过大的改变,把夹送链改为夹送辊的设计方法,简单而有效地达到工作稳定的目的,收到了良好奇的效果。     

超快变换高频变极性方波TIG电弧行为

基于一种新型电路变换拓扑实现频率达超音频段且具有超快速电流上升沿和下降沿变化速率的高频变极性方波电流输出,将其用于铝合金TIG焊接过程,研究分析高频变极性TIG电弧行为.结果表明,变极性电流频率和变化速率具有对电弧形态、稳定性及电弧力的控制能力,提高电流极性变换频率,电弧清除氧化膜的能力增强,电弧表现出明显的收缩效应,电弧电压和电弧等效电阻增大,但电弧偏吹作用加剧.在一定频率范围内,增加变极性电流频率,减小负极性电流幅值及其持续时间,可增大焊缝熔透率,有利于提高焊接效率和质量.     

稳定夹送辊理论设计方法

以带钢不产生塑性变形、空转辊不打滑为原则,研究稳定夹送辊理论设计方法。建立了夹送力计算模型、带钢临界塑性变形模型、空转辊打滑模型,将三个模型耦合迭代,理论计算了稳定夹送辊传动电机功率、辊径及空转辊空间布置尺寸,确保带材不会产生塑性变形和擦划伤。比较原有的经验设计方法,更加准确、可靠。     

Simulation and energy optimization of the stabilizer tower of a pyrolysis gasoline hydrogenation unit

Energy optimization of second distillation tower of a pyrolysis gasoline hydrogenation unit has been studied by the thermal cycle of vapor recompression method. The mentioned cycle is connected to the second distillation tower of the stabilizer of pyrolysis gasoline, and the results are found promising. The composite pinch curve for both the current and the optimized methods are shown. Moreover, an increase in the heat transfer rate in heat exchanger E-1014 causes energy recovery in reboiler. According to simulation results, by vapor recompression to 1970 kPa and using this heat source for thermal integration, condenser and reboiler’s energies are decreased by 56.93 and 30.4 percentage, respectively.     

造纸工业节水及纸厂废水零排放

讨论了采取科学用水管理和夹点技术的纸厂节水措施,总结了废水零排放带来的问题、以废纸为原料的纸厂废水零排放的可行性以及制浆造纸工业废水零排放所采用的各种废水处理技术,介绍了若干以废纸为原料生产纸板的工厂废水零排放的经验。     

攀钢热连轧卷取机夹送辊稳定性分析

介绍了攀钢热轧板厂地下卷取机夹送辊在生产过程中出现的问题并提出了相应的整改措施并对其稳定性进行了分析。     

Inventory pinch based,multiscale models for integrated planning and scheduling‐part II: Gasoline blend scheduling

Integration of planning and scheduling optimizes simultaneous decisions at both levels, thereby leading to more efficient operation. A three‐level discrete‐time algorithm which uses nonlinear models and integrates planning and detailed scheduling is introduced: first level optimizes nonlinear blend models via multiperiod nonlinear programming (NLP), where period boundaries are initially determined by the inventory pinch points; second level uses fixed recipes (from the first level) in a multiperiod mixed‐integer linear program to determine first an optimal production plan and then to optimize an approximate schedule which minimizes the total number of switches in blenders and swing tanks; third level computes detailed schedules that adhere to inventory constraints computed in the approximate schedule. If inventory infeasibilities appear at the second or the third level, the first‐level periods are subdivided and blend recipes are reoptimized. Algorithm finds the same or better solutions and is substantially faster than previously published full‐space continuous‐time model. © 2014 American Institute of Chemical Engineers AIChE J, 60: 2475–2497, 2014     

设计过程工业多杂质用水网络的计算方法

This paper introduces a non-iterative algorithmic procedure to design water utilization networks with multiple contaminants in process plants. According to the water pinch analysis rules, the processes in water utilization systems were first divided into three groups, then water-supply priority algorithm was proposed. The results of case studies showed that the water networks designed by this method gave water consumption lower than that estimated by other approaches. In addition, the procedure was subiect to no limitation on the problem scale.     

三次样条函数拟合平衡曲线求最小回流比

本文采用三次样条函数拟合汽－液平衡曲线，求算板式精馏塔的最小回流比．该法快速准确，适用于各种物系．文中给出了电算程序框图和计算实例．     

Summary of US–Japan Exchange 2004: New Directions and Physics for Compact Toroids

Scientists from research institutions in the United States of America and Japan attended a USA Department of Energy sponsored joint international workshop on the subject of Compact Toroids (CT) in Santa Fe, NM, USA in September 2004. We outline here a summary of the topics that were discussed, some of the implications, and new directions that are likely to follow from this research. Experimental, theoretical and computational results were presented. The experimental devices and concepts, along with the theory and computational models comprise investigations of fundamental plasma physics, fusion science, and approaches to fusion energy that require magnetized plasmas.