【作者】 唐明文；

【导师】 郁昊； 张春阳；

【作者基本信息】 南京林业大学 ， 机械工程， 2008， 硕士

【摘要】 乙烯生产装置的产品质量和产量(收率)不仅与经济效益直接相关,还直接影响大批下游生产装置(如聚乙烯装置、聚丙烯装置、乙二醇装置等)的正常生产运行和产品质量,因而在乙烯生产过程中的质量(收率)控制中占有非常突出的地位。本文基于正交实验设计法与逐步回归法建立乙烯装置裂解炉的预测模型,进行预测控制与优化。本文首先介绍建立裂解炉的工艺机理数学模型,再根据正交实验设计法与逐步回归法建立乙烯装置裂解炉的简化模型。利用实验数据通过非线性逐步回归方法,得到乙烯和丙烯的简化计算机控制模型。回归方程和回归系数的方差分析和统计检验表明回归效果很好,机理模型和简化模型结果相当吻合,表明简化模型精确性很高,因此可以利用该模型代替机理模型用于计算机控制。其次,主要介绍了裂解炉有关变量的软测量、裂解深度、裂解炉出口温度、裂解炉生产能力及原料量与稀释蒸汽比值控制,从而提高乙烯收率。最后,在对乙烯装置裂解炉先进控制的基础上进一步对裂解炉进行优化操作,以期裂解炉在一个运行周期内乙烯产品的平均产量最大。本章在约束条件基础上建立优化命题,应用网络实时快速训练方法和算法,精确地描述出工业裂解过程的操作特性,采用改进行模拟退火优化算法对系统进行优化。更多还原

【Abstract】 The product quantity and quality of etibylene production device not only is directly related with economic benefits but also influences the normal production movement and production quality of large downstreem production device (such as polyethylene device,polypropylene device,glycol device),as a result it accuplies a outstanding position in the quality (yield)control of enthylene production process. This text estabishes the pridict model of ethylene device cracking furnace according to orthogonal design method and stepwise regression method to predict control and optimization.Firstly, this text introduces mathematics model of the craft mechanism of the estabishment cracking furnace and then estabishes ethylene device cracking furnace’s simplified model according to orthogonal design method and stepwise regression method.The experiment deta is made use by the method of nonlinear regression method to get the simplified computer controlling model of ethlene and propylene.The analysis of variance and stastistics test of regression equation and regression coefifcient suggests the regression results is good ,the results of mechanism model and simplified model are very similiar and the exact rate of simplified model is very high,as a result this model can be made use to replace mechanism model which is used for computer control.Secondly,this test mainly introduces the soft measurement of the cracking furnace which has something with variables of cracking depth,the outlet temperature of cracking furnance,the production ability of cracking furnance and the raw materials ,and the steam dilution ratio control,in order to improve the yield of ethylene.In the end ,the cracking furnace gets optimal operated further on the basis of advanced control the ethylene device cracking furnace,in order to get the greatest average yield.This chaper establishes optimal proposition on the basis of constant conditions,applied network for fast training methods and algorithms ,decribes the operating characteristic idustrial pyrolysis process exactly and uses the optimal algorithms of simulated annealing for optimizing system.更多还原