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An Unsupervised Classification Method for Flame Image of Pulverized Coal Combustion Based on Convolutional Auto-Encoder and Hidden Markov Model

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  • Tian Qiu

    (Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process, North China Electric Power University, Beijing 102206, China)

  • Minjian Liu

    (Beijing Key Laboratory of New Technology and System on Measuring and Control for Industrial Process, North China Electric Power University, Beijing 102206, China)

  • Guiping Zhou

    (State Grid Liaoning Electric Power Supply Co, Ltd., Shenyang 110004, Liaoning Province, China)

  • Li Wang

    (State Grid Liaoning Electric Power Supply Co, Ltd., Shenyang 110004, Liaoning Province, China)

  • Kai Gao

    (State Grid Liaoning Electric Power Supply Co, Ltd., Shenyang 110004, Liaoning Province, China)

Abstract

Combustion condition monitoring is a fundamental and critical issue that needs to be addressed in the wide-load operation of coal-fired boilers. In this paper, an unsupervised classification framework based on the convolutional auto-encoder (CAE), the principal component analysis (PCA), and the hidden Markov model (HMM) is proposed to monitor the combustion condition with the uniformly spaced flame images, which are collected from the furnace combustion monitoring system. First, CAE is adopted to extract the features from the flame images, which obtain the sparse representations in the images. Then, PCA is applied to project the feature vectors into the orthogonal space for robustness and computation efficiency. Finally, a HMM is built to calculate the corresponding optimal states by learning the temporal behaviors in the compressed representations. A coal combustion adjustment experiment was conducted in a 660 MW opposed-firing boiler, and the sequential 14,400 flame images with three different combustion states were obtained to evaluate the effectiveness of the proposed approach. We tested six different compression dimensions of the latent variable z in the CAE model and ensured that the appropriate compress parameter was 1024. The proposed framework is compared with five other methods: the CAE + Gaussian mixture model (GMM), CAE + Kmean, the CAE + fuzzy c-mean method, CAE + HMM, and the traditional handcraft feature extraction method (TH) + HMM. The results show that the proposed framework has the highest classification accuracy (95.25% for the training samples and 97.36% for the testing samples) and has the best performance in recognizing the semi-stable state (85.67% for the training samples and 77.60% for the testing samples), indicating that the proposed framework is capable of identifying the combustion condition, changing when the combustion deteriorates as the coal feed rate falls.

Suggested Citation

  • Tian Qiu & Minjian Liu & Guiping Zhou & Li Wang & Kai Gao, 2019. "An Unsupervised Classification Method for Flame Image of Pulverized Coal Combustion Based on Convolutional Auto-Encoder and Hidden Markov Model," Energies, MDPI, vol. 12(13), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:13:p:2585-:d:245722
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    References listed on IDEAS

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    1. Roland Winkler & Frank Klawonn & Rudolf Kruse, 2011. "Fuzzy C-Means in High Dimensional Spaces," International Journal of Fuzzy System Applications (IJFSA), IGI Global, vol. 1(1), pages 1-16, January.
    2. Wang, Zhenyu & Song, Chunfeng & Chen, Tao, 2017. "Deep learning based monitoring of furnace combustion state and measurement of heat release rate," Energy, Elsevier, vol. 131(C), pages 106-112.
    3. Chen, Junghui & Hsu, Tong-Yang & Chen, Chih-Chien & Cheng, Yi-Cheng, 2010. "Monitoring combustion systems using HMM probabilistic reasoning in dynamic flame images," Applied Energy, Elsevier, vol. 87(7), pages 2169-2179, July.
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    Cited by:

    1. Chen, Hua & Yan, Tingting & Zhang, Xiaogang, 2020. "Burning condition recognition of rotary kiln based on spatiotemporal features of flame video," Energy, Elsevier, vol. 211(C).
    2. Han, Zhezhe & Hossain, Md. Moinul & Wang, Yuwei & Li, Jian & Xu, Chuanlong, 2020. "Combustion stability monitoring through flame imaging and stacked sparse autoencoder based deep neural network," Applied Energy, Elsevier, vol. 259(C).
    3. Romina Dastoorian & Lee J. Wells, 2023. "A hybrid off-line/on-line quality control approach for real-time monitoring of high-density datasets," Journal of Intelligent Manufacturing, Springer, vol. 34(2), pages 669-682, February.

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