利用FRI软件分析醋酸脱水塔运转状况

介绍了FRI筛板计算软件,与Aspen Plus软件结合,对PTA醋酸脱水塔的运行工况进行计算分析。结果表明,脱水塔71~77块塔板是全塔的瓶颈,重新设计降液管,可使1~70块和78~90块塔板能力分别达到115%和120%。     

用FRI技术诊断催化裂化主分馏塔的极限操作

用美国精馏研究公司(FRI)的技术分析了大连西太平洋石油化工有限公司2．0Mt／a重油催化裂化装置主分馏塔的极限操作，对现场取得的数据进行解释，提出了优化设计方案，探讨了处理量为2．8Mt/a操作的可能性。深入探讨了对筛孔塔板的优化设计判据，指出应根据塔板的作用来区别考虑塔板的适宜操作范围。     

Context induction: A proof principle for behavioural abstractions and algebraic implementations

An induction principle, called context induction, is presented which is appropriate for the verification of behavioural properties of abstract data types. The usefulness of the proof principle is documented by several applications: the verification of behavioural theorems over a behavioural specification, the verification of behavioural implementations and the verification of forget-restrict-identify implementations.In particular, it is shown that behavioural implementations and forget-restrict-identify implementations (under certain assumptions) can be characterised by the same condition on contexts, i.e. (under the given assumptions) both concepts are equivalent. This leads to the suggestion to use context induction as a uniform proof method for correctness proofs of algebraic implementations.     

催化裂化装置提高柴汽比改造

2002年石家庄炼油化工股份有限公司对催化裂化装置进行了改造,应用F.R.I.精馏技术收到了较好的效果。通过对FCC分馏塔塔板的调整,提高了塔的操作性能及产品的分离精度。尤其是顶部Ф4200段四层塔板和顶循系统改造,使汽油的干点从194℃降至174℃,柴汽比从0.5—0.6提高到0.8以上,消除了分馏塔顶部经常出现的淹塔现象。通过对稳定塔更换及相关系统改造,满足了液化气产率高的需要,保证了产品质量。     

基于改进指数再生采样核的有限新息率采样系统

在有限新息率(Finite Rate of Innovation, FRI)采样框架中,指数再生核具有良好的时域有限支撑特性,因此被广泛用作采样核。但是这一过程会将信号中的白噪声变为有色噪声,严重影响重构性能。为此,该文利用指数再生形式能够在卷积运算中得以保留的特性,提出一种改进的指数再生采样核,其对应的系数矩阵能够保持噪声的统计特性,进而保证重构算法性能。仿真实验表明该文方法能够有效提升重构性能。     

催化裂化汽油加氢装置稳定塔的工艺设计

采用流程模拟软件Aspen Plus 12.1和塔板计算软件FRI 2.1,对中国石油化工股份有限公司燕山分公司炼油厂220 kt/a催化裂化汽油加氢装置汽油稳定塔进行了模拟计算和塔板设计。生产实际验证结果表明,稳定塔的模拟计算结果与实际生产数据相吻合,塔顶液化气产品中C5的体积分数为0.02%,满足不大于0.50%的设计要求;塔底汽油中C4的质量分数为0.5%,满足不大于2.0%的设计要求。     

复杂脉冲序列的有限新息率采样方法

有限新息率(Finite Rate of Innovation,FRI)框架是针对非带限信号进行采样与重构的有效理论,然而该方法对脉冲频谱有特殊要求,对于复杂脉冲波形,方法可能失效。针对该问题,该文基于指数再生核设计了一种FRI采样与重构系统,其突出优势是能够通过合理地设置再生核参数来增加对复杂波形的适应性。另一方面,考虑到系统稳定性和采样核的实现,再生核参数还需要满足额外的约束条件,文中具体分析了这些约束因素,并给出了设置方法。最后以线性调频相位编码混合波形为例进行了仿真,结果验证了该文方法的有效性。     

Environmentally-assisted cracking behaviour in the transition region of an Alloy182/SA 508 Cl.2 dissimilar metal weld joint in simulated boiling water reactor normal water chemistry environment

The stress corrosion cracking (SCC) and corrosion fatigue behaviour perpendicular and parallel to the fusion line in the transition region between the Alloy 182 Nickel-base weld metal and the adjacent SA 508 Cl.2 low-alloy reactor pressure vessel (RPV) steel of a simulated dissimilar metal weld joint was investigated under boiling water reactor normal water chemistry conditions. A special emphasis was placed to the question whether a fast growing interdendritic SCC crack in the highly susceptible Alloy 182 weld metal can easily cross the fusion line and significantly propagate into the adjacent low-alloy RPV steel. Cessation of interdendritic SCC crack growth was observed in high-purity or sulphate-containing oxygenated water under constant or periodical partial unloading conditions for those parts of the crack front, which reached the fusion line. In chloride containing water, on the other hand, the interdendritic SCC crack in the Alloy 182 weld metal very easily crossed the fusion line and further propagated with a very high rate as a transgranular crack into the heat-affected zone and base metal of the adjacent low-alloy steel. The observed SCC cracking behaviour at the interface correlates excellently with the field experience of such dissimilar metal weld joints, where SCC cracking was usually confined to the Alloy 182 weld metal.     

网孔塔板的评价（Ⅱ）——用FRI数据改进网孔板设计模型

应用美国精馏研究公司（FRI）的工业测试数据对当前国内应用的网孔塔板设计模型进行了评价,计算结果表明,塔板压力降模型和操作上限模型的计算值都低于FRI工业测试值。在FRI数据基础上对设计模型进行了修正,得到的新塔板压力降、塔板上限模型具有较好的设计可靠性,提高了网孔塔板设计模型的预测精度。     

水力学软件在吸收塔中的应用及分析

选择合适的水力学软件能够简单、正确地计算塔设备的水力学数据。以BDO装置马来酸酐吸收塔为模型,对比分析Aspen Plus、FRI、KG-Tower 3种软件的水力学计算结果,综合来看FRI在界面友好及数据完整性方面优于其它软件。确定采用Aspen Plus进行塔内热力学计算,结果输入FRI进行水力学校核的方法。