Effect of cavitation on removal of alkali elements from coal

9th International Symposium on Cavitation

Srivalli, H.^1 ; Nirmal, L.^1 ; Nagarajan, R.^1

Department of Chemical Engineering, Indian Institute of Technology-Madras, Chennai

600036, India^1

关键词: Alkali elements;    Ash particles;    Cavitation effect;    Impurities in;    Low-frequency ultrasound;    Time interval;    Ultrasonic field;    Ultrasonic techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012107/pdf
DOI  :  10.1088/1742-6596/656/1/012107

来源: IOP

【 摘 要 】

The main impurities in coal are sulphur, ash and alkali. On combustion, the volatile forms of these impurities are either condensed on the boilers, or emitted in the form of potentially hazardous gases. The alkali elements present in coal help the fly ash particles adhere to boiler surfaces by providing a wet surface on which collection of these particles can take place. Use of ultrasonic techniques in cleaning of coal has stirred interest among researchers in recent times. Extraction of alkali elements by cavitation effect using low-frequency ultrasound, in the presence of reagents (HNO3and H2O2) is reported in this paper. Powdered coal was dissolved with the reagent and exposed to ultrasonic fields of various frequencies at different time intervals. The treated solution is filtered and tested for alkali levels.