用伪并行遗传/模拟退火算法进行多流股换热器网络综合的研究

The multi-stream heat exchanger network synthesis (HENS) problem can be formulated as a mixed integer nonlinear programming model according to Yee et al. Its nonconvexity nature leads to existence of more than one optimum and computational difficulty for traditional algorithms to find the global optimum. Compared with deterministic algorithms, evolutionary computation provides a promising approach to tackle this problem. In this paper, a mathematical model of multi-stream heat exchangers network synthesis problem is setup. Different from the assumption of isothermal mixing of stream splits and thus linearity constraints of Yee et al., non-isothermal mixing is supported. As a consequence, nonlinear constraints are resulted and nonconvexity of the objective function is added. To solve the mathematical model, an algorithm named GA/SA (parallel genetic/simulated annealing algorithm) is detailed for application to the multi-stream heat exchanger network synthesis problem. The performance of the proposed approach is demonstrated with three examples and the obtained solutions indicate the presented approach is effective for multi-stream HENS.     

海洋鱼油的生产与应用

全面回顾了国内外海洋鱼油生产与应用的历史与现状,指出海洋鱼油作为二十碳五烯酸(EPA)、二十二碳六烯酸(DHA)等ω-3多不饱和脂肪酸的重要来源,正在饲料、食品以及药品等领域展示其良好的应用前景.     

蚕丝织物活性染料冷轧堆染色工艺的优化

 在分析研究固色速率与固色碱剂、堆置温度、中性盐、分散剂等因素之间关系的基础上,探讨了乙烯砜和混合双活性基活性染料蚕丝织物冷轧堆染色的优化工艺条件。结果表明：采用纯碱和烧碱组成的混合碱剂,Na2CO3　20g/L,NaOH 1～5g/L,NaCl 0～20 g/L,分散剂0～1g/L,在25～30℃堆置8～12小时,并根据染料类型控制适当的工艺条件可使蚕丝织物冷轧堆染色获得较满意的实际应用效果。     

传统丝绸产业发展及技艺传承创新对策研究

本文主要探讨了江苏传统丝绸产业发展的一些情况,对相关丝绸产业中丝绸技艺的传承创新与产品设计开发的关联进行了探讨。对丝绸产业的发展与传统丝绸的创新进行了分析研究,并提出了一些参考的对策。     

Using Process Energy Integration Technology in the Energy-Saving Retrofit of Large-Scale Complex Chemical Process System

1 INTRODUCTIONIn recent years,the energy-saving retrofit of existing chemical process plants,especially exist-ing large-scale complex chemical process system(LCCPS),has been becoming necessary as theengineers'knowledge goes on and the market changes.     

基于多目标模糊优选理论的化合物环境影响指数确定及应用

Environment impact (EI) is a multi- decision-making, multi-objective and multi-criteria system with uncertainties and ambiguities, and environment impact index (EII) of a chemical compound is difficult to calculate appropriately with traditional methods. In this paper, fuzzy optimal selection theory based on the concept of relative importance degree is adopted to determine relativity of the degree of environment impact of chemical compounds as EII, and environment impact assessment (EIA) of a chemical process is done with values of compounds EII to select alternatives that cause less pollution to the environment. It is useful in further process optimization. The paper presents a practical application to the treatment of process condensate in a synthesis ammonia plant to illustrate the procedure, and the calculation result demonstrates the feasibility, practicability, and effectiveness of the suggested method.     

基于自适应并行禁忌搜索的精馏分离序列优化综合

由于精馏分离序列与二叉树之间具有同构性,在数据结构上精馏分离序列可以抽象为二叉树.采用图论方法建立了二叉树相邻切分点变换机制,进而形成有效的邻域结构.将自适应机制和并行技术引入禁忌搜索算法中,根据记忆频率信息自适应调整禁忌长度与候选集规模,通过搜索任务分配安排形成多任务并行处理.数值实验表明自适应并行禁忌搜索算法能够成功解算大规模精馏分离序列优化综合问题.     

大直径钢管柱内虹吸排水管道施工安装技术

为了提高大型场馆场地的利用率,降低排水管道对整个场馆设计效果的影响,针对采用大直径钢管柱做结构支撑的大型场馆建筑,提出利用钢管柱内的空间布置不锈钢排水管道,并对钢管柱与排水管道集成设计、细部构造、施工方法、防腐措施等进行了介绍。通过项目应用表明,所建议的方法解决了钢管柱内排水管道吊装稳定性、排水管道与结构柱防腐等难题,同时解决了大型场馆整体设计艺术效果与排水管道分散布置的矛盾,扩大了场馆建筑的使用空间,综合效益良好。     

汽车起重机起升机构液压系统的节能改进

针对汽车起重机起升机构液压系统在空载和轻载工况下能耗损失大的问题,将一种新型负载敏感平衡阀应用在该液压系统中,达到既平稳承载下行又节能的目的。利用AMESim仿真软件,与采用普通平衡阀的液压系统进行了比较研究。分析了两液压系统分别在空载、轻载和重载工况下的能耗情况,分析结果显示在轻载和空载下降工况时采用负载敏感平衡阀的液压系统的能耗比普通平衡阀的小,空载时能耗损失可减小94.7%。     

加强实践教学,提高实践教学水平——对高职高专实践教学改革的思索

实践教学是高职教学过程的重要环节,是培养学生专业技能、提高学生动手操作能力的重要手段。当前如何加强实践教学,提高实践教学的水平是各类职业院校研究的重要课题。文章对高职高专实践教学的改革进行了初步的探索。