Application of BP neural network based on MIC screening rules in modeling and product prediction of shift unit

doi:10.16085/j.issn.1000-6613.2021-2552

Abstract

Abstract:

In the construction of digital factories in petrochemical enterprises, the digital intelligent construction of the unit is a key step. According to the need of a shift unit intelligent construction in a petrochemical enterprise, combined with the characteristics of the unit, a set of real-time data filtering rules was created based on maximum information coefficients (MIC), and the product quality prediction model was constructed based on the BP neural network. Results showed that own-developed real-time data filtering rules were used to analyze the actual operating data of a total of 1041 sets collected for 44 days. After the number of variables had been reduced from 161 to 23, it was found that the screening rules could effectively reduce the dimensionality of the data, with a data simplification rate of 85.63%. Furthermore, this model with the best product quality prediction was constructed by the Levenberg-Marquardt method and a network structure with three hidden layers. Comparing the CO molar content value of the shift gas at the outlet of the unit obtained by simulation with the actual production value, it was found that the simulated value deviated very little from the actual value (average deviation 1.193%), which showed that the model built in this paper could predict the product composition of unit very well, and it was proved to be reliable. This model is not only useful for optimizing shift unit production, but also integrated into the factory cyber-physical system (CPS) to facilitate unit digitization and intelligent construction. In addition, the method can be used as modeling reference of other similar units.

Key words: shift unit, hybrid modeling, BP neural network, MIC, CPS

摘要：

在石化企业数字工厂建设中，装置的数字智能化建设十分重要。本文针对某石化企业变换装置数字化建设的需要，结合装置特点，建立了基于最大信息系数方法（MIC）的装置实时数据筛选规则和基于BP神经网络的装置产品质量预测模型。结果表明，利用实时数据筛选规则对采集到的44天共1041组装置实际运行数据进行分析，将161个变量参数删减到23个变量参数，有效降低了数据的维度，数据简化率达到85.63%；进一步采用Levenberg-Marquardt方法，用3层隐含层的网络结构建立装置的产品质量预测模型，模拟得到的装置出口变换气CO摩尔含量值与实际生产偏差很小（平均偏差1.193%），说明本文所建模型可以很好地预测装置产品组成。以上建立的模型可为装置生产优化提供支撑，并可集成到工厂信息物理系统（CPS）中，支撑装置数字化和智能化建设需要。本文所提出的建模方法同样可用于其他类似装置的建模参考。

关键词: 变换装置, 混合建模, BP神经网络, 最大信息系数方法, 信息物理系统

CLC Number:

TQ015

PAN Yanqiu, LI Pengfei, GAO Shilei, YU Lu. Application of BP neural network based on MIC screening rules in modeling and product prediction of shift unit[J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 36-43.

潘艳秋, 李鹏飞, 高石磊, 俞路. 基于MIC筛选规则和BP神经网络的变换装置建模及产品预测[J]. 化工进展, 2022, 41(S1): 36-43.

Figures/Tables 13

日期	FIC2201	TI2216E	PI2201	PDI2241	…	AI2201
10/01/0：00	83.696	417.92	3.433	25.51	…	0.4237
…	…	…	…	…	…	…
10/02/0：00	81.5675	418.30	3.4201	30.30	…	0.4307
…	…	…	…	…	…	…
10/03/0：00	81.3952	421.16	3.4257	34.16	…	0.4550
…	…	…	…	…	…	…
10/04/0：00	95.8543	420.26	3.5567	42.12	…	0.5284
…	…	…	…	…	…	…
11/13/0：00	100.5424	416.68	3.5665	75.17	…	0.6530

方法	sigmoid $y = 1 1 - e - x$	tanh $y = e x - e - x e x + e - x$	lin y=0.2x	co-no $y = s i n (π x 2) + 20 (x - 0.5) 2 + 10 x 600$
Pearson	0.973	0.935	1.000	-0.187
Spearman	1.000	1.000	1.000	-0.140
Kendall	1.000	1.000	1.000	-0.096
MIC	1.000	1.000	1.000	1.000

方法	sigmoid $y = 1 1 - e - x$	tanh $y = e x - e - x e x + e - x$	lin y=0.2x	co-no $y = s i n (π x 2) + 20 (x - 0.5) 2 + 10 x 600$
Pearson	0.973	0.935	1.000	-0.187
Spearman	1.000	1.000	1.000	-0.140
Kendall	1.000	1.000	1.000	-0.096
MIC	1.000	1.000	1.000	1.000

序号	MIC	序号	MIC
1	0.6117	18	0.4051
2	0.2278	19	0.3978
3	0.2758	20	0.4371
4	0.6272	21	0.3866
5	0.3623	22	0.3996
6	0.3246	23	0.3918
7	0.4250	24	0.5599
8	0.2665	25	0.4182
9	0.3395	26	0.2440
10	0.4806	27	0.5809
11	0.2833	28	0.3735
12	0.5588	29	0.7055
13	0.5655	30	0.2579
14	0.5568	31	0.2424
15	0.5577	…	…
16	0.5568	107	0.3020
17	0.5657	均值	0.4553

变量编号	变量名称及含义	变量编号	变量名称及含义
1	TI2201/来自粉煤气化的粗合成气温度	13	PI2206/E2201入口低压氮气压力
2	TIC2206/E2201入口HS温度	14	PDI2207/R2201A催化剂床层压差
3	TI2211E/R2201A催化剂床层E点温度	15	PIC2214/E2205压力
4	TI2214A/R2201B催化剂床层A点温度	16	PDI2222/R2204催化剂床层压差
5	TIC2270/R2203入口温度	17	PI2231/P2201A/B出口工艺冷凝液压力
6	TI2225A/R2203催化剂床层A点温度	18	FIC2201/进变换系统MS流量
7	TI2231/E2208出口低压蒸汽温度	19	FIC2208/V2204入口锅炉水流量
8	TI2235/V2202出口变换气温度	20	LI2201/V2201汽液分离器液位
9	TI2237/E2210出口变换气温度	21	LIC2208/V2206液位差
10	TI2246/C2202出口酸性气体温度	22	LIC2210/E2208液位
11	PI2201/V2201粗合成气进口压力	23	AI2201/CO摩尔组成分析
12	PI2203进变换中压蒸汽压力

算法	R	MSE/×10^-4	时间/s
L-M	0.979	1.56	117
B-R	0.983	1.19	1001
SCG	0.943	4.06	151

序号	组合	R	MSE	序号	组合	R	MSE
1	6×6×6	0.9788	1.560×10^-4	10	10×7×6	0.9804	1.447×10^-4
2	7×6×6	0.9794	1.515×10^-4	11	6×8×6	0.9791	1.540×10^-4
3	8×6×6	0.9798	1.489×10^-4	12	7×8×6	0.9800	1.476×10^-4
4	9×6×6	0.9805	1.436×10^-4	13	8×8×6	0.9804	1.444×10^-4
5	10×6×6	0.9807	1.426×10^-4	14	9×8×6	0.9805	1.439×10^-4
6	6×7×6	0.9791	1.537×10^-4	…	…	…	…
7	7×7×6	0.9798	1.492×10^-4	95	10×9×9	0.9813	1.382×10^-4
8	8×7×6	0.9800	1.471×10^-4	…	…	…	…
9	9×7×6	0.9805	1.439×10^-4	125	10×10×10	0.9812	1.383×10^-4

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