流程模拟技术在板式换热器技改方案确定中的实践

乙炔装置溶剂再生工段溶剂换热器达产达标整改过程中,利用流程模拟技术,结合现场实际情况,通过设计型计算初定换热面积,利用模拟与校核型计算对其进行优化,确定了技术改造方案。改造后,溶剂换热器的换热效果、压降等均达到指标要求。     

丙烯酸精制单元的计算机模拟与优化

运用ASPENPLUS化工过程模拟软件对丙烯酸精制单元进行了单塔及全流程的模拟与优化，模拟值与设计值基本吻合，可用于指导实际生产操作和设备改造，优化生产操作参数，提高企业的计算机应用水平。     

调峰型天然气液化流程影响因素分析

调峰型天然气液化流程是实际生产过程中比较实用的天然气液化工艺流程。通过HYSYS模拟软件,模拟计算调峰型天然气液化流程在LNG储存压力、混合冷剂(N_2+CH_4)以及高(低)压制冷剂压力不同值时的效果,并计算分析液化流程达到最佳效果时各影响因素的取值范围,为实际工艺流程设计提供理论指导。     

磷酸氢钙的大型气流干燥装置设计

介绍了一种大型气流干燥磷酸氢钙的工业生产流程，对干燥管内颗粒和空气的干燥特性进行了模拟和计算机辅助设计，模拟设计结果与实际生产情况较吻合。     

水溶液全循环法尿素生产流程模拟软件的开发

为配合中小型尿素装置的挖潜改造，开发了水溶液全循环法尿素生产流程的专用模拟软件。该软件具有物性推算、单元模拟以及流程模拟等功能，在流程模拟中采用了联立模块法的解算方法。经过严格考核，结果表明该软件能够反映装置的实际过程，模型准确，结果可靠。     

流程模拟技术在焦化主分馏工艺中的应用

针对锦州石化延迟焦化主分馏塔能耗较大的问题,运用流程模拟软件SjmSci/PR0 Ⅱ对延迟焦化分馏单元进行了模拟,选取Refinery估算方法和Grayson-streed物性选择集对延迟焦化分馏单元进行了模拟.模拟结果与实际生产数据基本一致,说明流程模拟技术对实际生产有很好的指导作用.     

模拟汽提蒸汽流量、温度、压力对C205分离效果的影响

在研究汽提蒸汽和产品初馏点关系时,需先对原流程展开模拟,当模拟值与实际值的差值较小时,才能开始实施接下来的模拟及优化工作。而对原流程的模拟需要通过两步完成,首先获取数据,其次搭建流程。     

煤气化废水处理流程建模和全流程模拟

为分析煤气化废水处理过程存在的问题,采用Aspen Plus流程模拟软件对该过程进行了全流程建模和模拟。在体系和流程分析的基础上,确定了合适的代表组分,选择了适用于该实际流程各单元操作的热力学方法和计算模块,提出了适合于该体系的萃取液液平衡关系和萃取平衡级模型并构建了用户自定义模块。同时提出了提高模拟效率和改善收敛性的模拟技术及收敛策略。结果表明,模拟值与工厂实际数据非常吻合,该流程中存在的主要问题是汽提脱酸、萃取脱酚环节的效率偏低;全流程模拟可为同类装置的设计、流程改进、装置改造及操作优化提供依据。     

原油常减压蒸馏塔的流程模拟

常减压蒸馏装置是炼油加工的第一道工序,它的运行状况对后续装置乃至全厂都有着重要影响。针对初馏塔、常压蒸馏塔和减压蒸馏塔的稳态流程模拟,选取适合的蒸馏塔中段循环设定变量和减压塔模拟方法,最终流程模拟结果与实际工艺参数相似度极高,说明常减压蒸馏塔的流程模拟能够如实体现实际工艺状态,可以作为指导工艺生产、操作优化的有效方法。     

浅谈流程模拟软件在化工原理教学中的作用

本文结合多年的从事流程模拟与优化技术的实践经验和化工原理教学经验,从理论教学、课程设计和实验教学等三个方面介绍了流程模拟软件在化工原理教学中的作用.实践表明,采用流程模拟软件辅助化工原理教学的方法,不仅有助于学生获得对各种单元过程的深刻理解和工程判断能力.而且有助于培养学生利用流程模拟与优化技术解决工程实际问题的能力.     

集成化工过程模拟系统的建立和应用

集成化工模拟系统的意义在于使化工过程的概念设计(包括摸拟、控制、设备估计、经济分析和评价等)实现一体化,这就要求系统在结构上更具有通用性和灵敏性。本文首先对集成模拟系统软件设计进行了描述,给出了系统的数据结构及框架;其次,介绍了这样一个集成模拟系统的模型软件及其应用;最后,讨论了今后该模型系统在几个主要方面的发展前景。     

A dynamic process simulator based upon the cluster-modular approach

The objectives of this work are to present the dynamic simulation strategy based on clustermodular approach and to develop a prototype simulator. In addition, methods for the improvement of computational efficiency and applicability are studied. A process can be decomposed into several clusters which consist of strongly coupled units depending upon the process dynamics or topology. The combined approach of simultaneous and sequential simulation based on the cluster structure is implemented within the developed dynamic process simulator, MOSA (Multi Objective Simulation Architecture). Dynamic simulation for a utility plant is presented as a case study in order to prove the efficiency and flexibility of MOSA.     

Simulation of Real Discrete Time Gaussian Multivariate Stationary Processes with Given Spectral Densities

In this article we establish a simulation procedure to generate values for a real discrete time multivariate stationary process, based on a factor of spectral density matrix. We prove the convergence of the simulator, at each time epoch, to the actual process, and provide the corresponding rate of convergence. We merely assume that the spectral density matrix is continuous and of bounded variation. By using the positive root factor, we provide an extended version for the Sun and Chaika ( 1997 ) simulator, for real univariate stationary processes.     

Improved infeasible path optimization for sequential modular simulators—I: The interface

Recently, it was shown that chemical processes modeled by steady-state simulators could be optimized without repeatedly converging the process simulation. Instead, optimization and simulation of the process can be performed simultaneously (along an infeasible path), thus leading to much more efficient performance. In this two-part study, several improvements to this infeasible path approach are described. This first paper deals with improvements to the interface between the optimization algorithm and the process simulator. Here one is primarily concerned with obtaining the necessary function and gradient information for the optimization with minimum computational effort from the process simulator. The architecture of sequential modular simulators, the structure of process optimization problems and any sources of error in obtaining the necessary gradient information for the optimization algorithm are considered. To this end, a chainruling algorithm is derived that allows the incorporation of analytic derivative information for parts of the flowsheet and generally leads to less frequent evaluation of the flowsheet modules. This algorithm is demonstrated on three process optimization problems. The results indicate significant improvement in performance.     

Flowsheet Simulation of Soil-Washing Processes

Application of flowsheet simulation systems is not common in solids processing. Commercially available flowsheet simulation systems have usually a strong focus on fluid processes and just a few solids handling features. Special requirements for solids processing are identified and taken into consideration during development and implementation of an appropriate flowsheet simulation system. The features of the prototype simulator SolidSim are presented. Applications to soil-washing – a process for remediation of contaminated soils – demonstrate the usefulness of the simulator in plant design, plant adaptations and related tasks for complex solids processes.     

Equation oriented method for Rectisol wash modeling and analysis☆

Rectisol process is more efficient in comparison with other physical or chemical absorption methods for gas pu-rification. To implement a real time simulation of Rectisol process, thermodynamic model and simulation strat-egy are needed. In this paper, a method of modified statistical associated fluid theory with perturbation theory is used to predict thermodynamic behavior of process. As Rectisol process is a highly heat-integrated process with many loops, a method of equation oriented strategy, sequential quadratic programming, is used as the solver and the process converges perfectly. Then analyses are conducted with this simulator.     

Simulation of 1,3-butadiene extractive distillation process using N-methyl-2-pyrrolidone solvent

A computer simulation was performed using a commercial process simulator, Aspen Plus, for NMP (Nmethyl-2-pyrrolidone) extractive distillation process to separate 1,3-butadiene from the C₄ hydrocarbon mixtures. The Redlich-Kwong equation of state and NRTL activity coefficient model were used to calculate thermodynamic properties in the simulation of the extractive distillation process. Binary parameters of the NRTL model not provided in the simulator were estimated using the UNIFAC method. The simulation results of the 1,3-butadiene recovery from the C₄ mixtures were in good agreement with the plant operation data. The process simulation showed that the material balances in the extractive distillation were successfully predicted for various NMP solvent flow rates. The results obtained in this work provided the optimum solvent rate and the reflux ratio for the NMP extractive distillation process to separate 1,3-butadiene from the C₄ mixtures.     

Dynamic process simulation using flowsheet structure

A technique is described for the dynamic simulation of chemical processes which enables an implicit integration method to be used, efficiently and economically, to solve the ordinary differential equations which arise in such simulations. This technique has been used to convert an existing steady state “flowsheet” simulator into a dynamic process simulator.The technique uses the structure of the process and its equation to avoid the generation and manipulation of the Jacobian matrix normally associated with implicit integration methods. The major advantage of such methods, namely the ability to integrate sets of stiff equations with timesteps greater than the smaller time constants, is retained.     

烃类分离装置通用流程模拟系统

本文介绍“烃类分离装置通用流程模拟系统”的微机版本。该模拟程序进行流程的物料平衡和能量平衡计算,满足气体分离、乙烯等石油化工工业的工艺模拟需要。该模拟系统便于使用,具有灵活可变的结构。用户无需编写任何执行程序。对不同流程、程序会自动生成不同的执行程序。通常为进行模拟计算,仅需下述四方面的工作:①根据工艺流程图作出信息流程图;②对物流及单元过程分别编号;③输入工艺参数及初值;④执行运算。该模拟系统适用于IBM-XT,IBM-5550机及任何相当的微机。