Fault diagnosis of airflow jamming fault in double circulating fluidized bed based on multi-scale feature energy and KELM

doi:10.11949/0438-1157.20181334

Abstract

Abstract:

In order to alleviate the negative impact of dual circulating fluidized bed agglomeration and plugging failure on biomass gasification reaction, a fault diagnosis model based on multi-scale feature energy-kernel extreme learning machine (KELM) was proposed. Firstly, wavelet decomposition is used to obtain the multi-scale signal in the fault state, then the feature energy of each scale is extracted as the feature vector, and finally input into the nuclear limit learning intelligent diagnosis model optimized by genetic algorithm to realize the intelligent diagnosis of dual circulating fluidized bed airflow blockage faults. Through the classification and analysis of the open bearing fault data set and the dual-circulating fluidized bed cold experimental system data, and compared with the KELM diagnostic model based on variational mode decomposition and sample entropy feature extraction, the results show that the model has higher fault diagnosis accuracy (82.5%), which can effectively extract fault characteristics and be used for efficient classification and identification of dual circulating fluidized bed airflow blockage.

Key words: fault diagnosis, circulating fluidized bed, multiscale, genetic algorithm, kernel extreme learning machine

摘要：

为减轻双循环流化床结块与堵塞故障对生物质气化反应的负面影响，提出基于多尺度特征能量-核极限学习机(kernel extreme learning machine, KELM)的故障诊断模型。首先对故障状态下压力信号采用小波分解获得多尺度信号，然后提取各尺度特征能量作为特征向量，最后将其输入经遗传算法优化的核极限学习智能诊断模型，实现双循环流化床气流堵塞故障的智能诊断。通过对公开的轴承故障数据集和双循环流化床冷态实验系统数据的分类识别分析，并与基于变分模态分解和样本熵特征提取的KELM诊断模型进行比较，结果表明：本模型具有较高的故障诊断精度(82.5%)，能够有效提取故障特征，用于双循环流化床气流堵塞的高效分类识别。

关键词: 故障诊断, 循环流化床, 多尺度, 遗传算法, 核极限学习机

CLC Number:

TK 229

Xin YANG, Zherui MA, Henan SHEN, Hongwei CHEN. Fault diagnosis of airflow jamming fault in double circulating fluidized bed based on multi-scale feature energy and KELM[J]. CIESC Journal, 2019, 70(7): 2616-2625.

杨新, 麻哲瑞, 申赫男, 陈鸿伟. 基于多尺度特征能量-核极限学习机的双循环流化床气流堵塞故障智能诊断[J]. 化工学报, 2019, 70(7): 2616-2625.

Figures/Tables 14

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模型		诊断精度
BPNN	79.28%	61.80%
SVM	90.77%	76.53%
ELM	95.38%	70.25%
KELM	96.33%	83.00%
VMD-SE-KLEM	93.89%	84.00%
WD-SE-KELM	85.67%	92.67%
VMD-FE-KELM	94.33%	95.00%
WD-FE-KELM	95.78%	95.33%

模型		诊断精度
BPNN	79.28%	61.80%
SVM	90.77%	76.53%
ELM	95.38%	70.25%
KELM	96.33%	83.00%
VMD-SE-KLEM	93.89%	84.00%
WD-SE-KELM	85.67%	92.67%
VMD-FE-KELM	94.33%	95.00%
WD-FE-KELM	95.78%	95.33%

K	IMF1	IMF2	IMF3	IMF4	IMF5	IMF6	IMF7	IMF8	IMF9	IMF10
1	4.33×10^-5	—	—	—	—	—	—	—	—	—
2	3.71×10^-5	7.99	—	—	—	—	—	—	—	—
3	3.71×10^-5	7.99	40.41	—	—	—	—	—	—	—
4	3.65×10^-5	7.97	21.12	40.41	—	—	—	—	—	—
5	3.64×10^-5	7.96	17.46	25.68	40.49	—	—	—	—	—
6	3.60×10^-5	7.96	17.23	24.77	33.13	40.91	—	—	—	—
7	3.62×10^-5	7.91	13.06	19.55	25.72	33.48	41.00	—	—	—
8	3.60×10^-5	7.92	13.44	19.97	25.91	33.33	40.44	47.22	—	—
9	3.60×10^-5	7.88	11.41	17.10	21.94	27.46	34.07	40.53	47.24	—
10	2.95×10^-5	4.04	7.96	11.80	17.24	22.02	27.49	33.92	40.51	47.23

K	IMF1	IMF2	IMF3	IMF4	IMF5	IMF6	IMF7	IMF8	IMF9	IMF10
1	4.33×10^-5	—	—	—	—	—	—	—	—	—
2	3.71×10^-5	7.99	—	—	—	—	—	—	—	—
3	3.71×10^-5	7.99	40.41	—	—	—	—	—	—	—
4	3.65×10^-5	7.97	21.12	40.41	—	—	—	—	—	—
5	3.64×10^-5	7.96	17.46	25.68	40.49	—	—	—	—	—
6	3.60×10^-5	7.96	17.23	24.77	33.13	40.91	—	—	—	—
7	3.62×10^-5	7.91	13.06	19.55	25.72	33.48	41.00	—	—	—
8	3.60×10^-5	7.92	13.44	19.97	25.91	33.33	40.44	47.22	—	—
9	3.60×10^-5	7.88	11.41	17.10	21.94	27.46	34.07	40.53	47.24	—
10	2.95×10^-5	4.04	7.96	11.80	17.24	22.02	27.49	33.92	40.51	47.23

系统状态	特征提取方法	尺度1/IMF2	尺度2/IMF3	尺度3/IMF4	尺度4/IMF5	尺度5/IMF6	尺度6/IMF7	尺度7/IMF8
边壁堵塞	VMD-SE	0.11167	0.29565	0.53492	0.46485	0.23394	0.06911	0.00174
	WD-SE	0.31554	0.43322	0.66762	0.48942	0.15439	0.05994	0.00892
	VMD-FE	0.29395	0.83809	0.74122	0.12259	0.01358	0.00084	0.00069
	WD-FE	0.10558	0.46791	0.85912	0.17637	0.02507	0.00716	0.00637
结块	VMD-SE	0.03594	0.00046	0.00062	0.00227	0.00133	0.00029	0.00059
	WD-SE	0.96752	0.11002	0.11603	0.08652	0.06287	0.15519	0.05303
	VMD-FE	0.02199	0.02447	0.04116	0.00386	0.00013	0.00005	0.00166
	WD-FE	0.46983	0.43053	0.60514	0.23291	0.07700	0.10832	0.39473