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Diagnosis and Traceability Analysis of Slurry Foaming of Limestone-Gypsum Wet Flue-Gas Desulfurization (WFGD) System

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Abstract

Based on problem diagnosis and sample analysis of a typical case of wet flue-gas desulfurization (WFGD) slurry foaming, this study deeply explored and traced the slurry foaming origins. Above all, the main causation of this accident was the accident slurry discharged with the absorber slurry to cause chemical oxygen demand (COD) of the absorber slurry exceeded the tolerance. Secondly, the continuous accumulation of defoamers and other additives was also one of the important causes. These organic substances entered the absorber slurry, deteriorated the slurry quality and caused the slurry viscosity to increase and the surface tension to decrease. Besides, the organic substances in the absorber slurry may undergo some chemical reactions, such as saponification, to produce foam. Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC–MS) analysis of absorber slurry and overflow foam showed that the key organics to cause slurry foaming were 9-octadecane amide, cyclic polydimethylsiloxane, and N-cyclohexyl cyclohexylamine. This study provided an efficient problem diagnosis method and countermeasures including necessary efforts to slow down the accident before the problem clearly investigated and targeted measures according to analysis results.

Highlights

• Establish the problem diagnosis and tracking system of slurry foaming.

• Set up the detection and analysis system of slurry foaming related samples.

• Creatively used the qualitative methods of organic substances to find key substances.

• Establish the connection between chemical analysis and factor screening.

• The proposed comprehensive elimination measures are universal.

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Data Availability

All data generated or analyzed during this study are included in this published article (and its supplementary information files).

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Authors and Affiliations

  1. China Datang Corporation Science and Technology General Research Institute Co., Ltd Northwest Branch, Economic and Technological Development District, 155 Fengcheng Seven Road, **’an, 710021, China

    Qinhao Kang & Yuan Yuan

  2. College of Chemical Engineering, Bei**g University of Chemical Technology, 15 Beisanhuan East Road, Chaoyang District, Bei**g, 100029, China

    Qinhao Kang

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  1. Qinhao Kang
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  2. Yuan Yuan
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Correspondence to Qinhao Kang.

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Appendix

Appendix

Table

Table 7 Sample and methods
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7

Table

Table 8 Regents, instruments basic information
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8

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Kang, Q., Yuan, Y. Diagnosis and Traceability Analysis of Slurry Foaming of Limestone-Gypsum Wet Flue-Gas Desulfurization (WFGD) System. Water Air Soil Pollut 234, 108 (2023). https://doi.org/10.1007/s11270-023-06135-9

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