Performance evaluation of circulating fluidized bed incineration of municipal solid waste by multivariate outlier detection in China

doi:10.1007/s11783-017-0945-3

Front. Environ. Sci. Eng.

2017, Vol. 11

Issue (6) : 4 https://doi.org/10.1007/s11783-017-0945-3

RESEARCH ARTICLE

Performance evaluation of circulating fluidized bed incineration of municipal solid waste by multivariate outlier detection in China

Hua Tao^1,², Pinjing He³, Yi Zhang⁴, Wenjie Sun¹(

)

¹. Department of Civil and Environmental Engineering, Southern Methodist University, PO Box 750340, Dallas, TX 75205, USA
². China Association of Urban Environmental Sanitation, Beijing 100044, China
³. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
⁴. Shanghai Institute for Design & Research on Environmental Engineering, Shanghai 200232, China

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Abstract

Reducing load change frequency is more important than magnitude for performance.

Overloading is more often than underloading. The frequent overloading is 0% to 30%.

Heterogeneous property of MSW can be magnified by the frequent load changes.

Appropriate MSW storage capacity may buffer and reduce the frequency of load change.

This first nationwide survey was conducted to evaluate the overall performance of the circulating fluidized bed (CFB) incineration of municipal solid waste (MSW) in 2014-2015 in China. Total 23 CFB incineration power plants were evaluated. The data for monthly average flue gas emission of particles, CO, NO_x, SO₂ and HCl were collected over 12 consecutive months. The data were analyzed to assess the overall performance of CFB incineration by applying the Mahalanobis distance as a multivariate outlier detection method. Although the flue gas emission parameters had met the Chinese national emission standards, there were 11 total outliers (abnormal behavior) detected in 6 out of 23 CFB incineration power plants from the perspective of the MSW incineration performance. The results demonstrate that it is more important for a better performance of CFBs to reduce the frequencies of the MSW load changes, rather than the magnitudes of the MSW load changes, particularly reducing the frequencies in the range of 10% and more of the load changes, under the same and stable conditions. Furthermore, the overloading occurs more often than the underloading during the operation of the CFB incineration power plants in China. The frequent overloading is 0% to 30% of the designed capacity. To achieve the stable performance of CFBs in practice, an appropriately designed MSW storage capacity is suggested to build in a plant to buffer and reduce the frequency of the load changes.

Keywords Municipal solid waste Incineration Circulating fluidized bed Load change Multivariate outlier detection

Corresponding Author(s): Wenjie Sun

Issue Date: 11 May 2017

Cite this article:

Hua Tao,Pinjing He,Yi Zhang, et al. Performance evaluation of circulating fluidized bed incineration of municipal solid waste by multivariate outlier detection in China[J]. Front. Environ. Sci. Eng., 2017, 11(6): 4.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-017-0945-3
https://academic.hep.com.cn/fese/EN/Y2017/V11/I6/4

Fig.1 Relationship between the number of detected outliers and the quantity of combusted MSW

Fig.2 (a) The detected outlier distribution based on the MSW load changes, (b) Histogram for the load changes of MSW combusted by 6 plants with detected outlier, (c) Histogram for the load changes of MSW combusted by the 23 plants after removing detected outliers

Tab.1 Material consumption (kg/ton MSW)

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