基于带搜索约束的神经网络实现吸收稳定系统操作优化

发布时间：2018-05-08 18:50

本文选题：吸收稳定系统 + 人工神经网络(ANN)　；参考：《石油学报(石油加工)》2017年06期

【摘要】：吸收稳定系统是多变量、强耦合系统,难于实现基于机理模型的操作优化。提出了用带搜索约束的神经网络(ANN),结合遗传算法(GA),实现吸收稳定系统操作优化的新方法。第1步,选用富气压缩机出口压力、补充吸收剂流量和吸收剂温度作为调优变量,以产品产量、压缩机功耗、解吸塔和稳定塔再沸负荷及主要冷却负荷为输出变量,建立具有最佳初始权值和阈值的吸收稳定系统反向传播型(BP)神经网络模型,以预测系统的操作;第2步,用GA引导BP模型实施以系统综合效益最大为目标函数的优化计算,以确定系统的最佳操作变量值。鉴于ANN"黑箱"特征,不掌握调优变量之间的关系,GA寻优可能陷入无效区域,从吸收稳定工艺出发,提出用吸收塔回流板水力学特征约束GA次代的产生,以保证寻优过程有效进行。某1.2 Mt/a重油催化裂化装置吸收稳定系统应用表明,该方法是有效的,经过12代GA运算成功找到最佳操作点,相较于现有操作,综合效益增加252万RMB/a。
[Abstract]:The absorption stabilization system is multivariable and strongly coupled system, so it is difficult to realize the operation optimization based on the mechanism model. A new method for optimizing the operation of absorbing and stabilizing systems using neural networks with search constraints and genetic algorithm (GA) is proposed. In the first step, the outlet pressure of the rich gas compressor, the flux of the absorbent and the temperature of the absorbent are selected as the optimal variables. The output, the power consumption of the compressor, the reboiling load of the desorption tower and the stabilizer and the main cooling load are taken as the output variables. In order to predict the operation of the system, a BP neural network model with the best initial weight and threshold is established to predict the operation of the system. In the second step, GA is used to guide the BP model to carry out the optimization calculation with the maximum comprehensive benefit of the system as the objective function. To determine the optimal operating variable value for the system. In view of the "black box" characteristics of ANN, the relationship between optimization variables is not grasped and GA optimization may fall into an invalid region. Based on the absorption stabilization process, the hydraulics characteristics of absorption tower backflow plate are proposed to restrict the generation of GA secondary generation. To ensure that the optimization process is carried out effectively. The application of absorption and stabilization system in a 1.2 Mt/a heavy oil catalytic cracking unit shows that this method is effective. After 12 generations of GA operation, the optimal operating point is found successfully. Compared with the existing operation, the comprehensive benefit is increased by 2.52 million RMB / a.
【作者单位】：华南理工大学化学与化工学院;中国石化洛阳工程有限公司;
【分类号】：TE624

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