Journal
FUEL
Volume 305, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.121595
Keywords
Ge-rich coals; Deleterious trace elements; Partitioning behavior; Coal combustion
Categories
Funding
- Key Project of National Natural Science Foundation of China [42030807]
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Research on the partitioning behavior of 17 deleterious trace elements in Ge-rich coals during combustion at different scales found differences in volatilization behavior, with elements being more completely volatilized in coal-fired power plants compared to laboratory settings due to operating conditions. The volatilization behavior of trace elements in combustion can be classified into three stages, with elements falling into four groups based on their behavior during these stages. Factors affecting the behavior of elements in combustion were also discussed, providing further insight into potentially controlling their emissions.
Partitioning behavior of 17 deleterious trace elements in Ge-rich coals during coal combustion was studied in a bench-scale combustion apparatus in a laboratory and in full-scale combustion in a coal-fired power plant. Methods used in this study include spectrophotometry, tube furnace combustion, inductively coupled plasma mass spectrometry (ICP-MS), and statistical evaluation. A comparison of the results obtained at these two scales and of the factors affecting their volatilization behavior during combustion are discussed. These seventeen trace elements tend to be volatilized more completely during combustion in coal-fired power plant than in a laboratory-scale combustion environment due to the differences in operating conditions. The average proportions of elements going into fly ash from feed coals during combustion are positively correlated with the trace element volatilities. Volatilization behavior of trace elements in laboratory-scale combustion involves three stages: initial release ( 500 celcius), relative stability (500-1,000 celcius), and secondary release or stability ( 1,000 celcius). The seventeen trace elements can be classified into four groups according to their behavior during the abovementioned stages. Factors affecting behavior of elements in combustion, such as combustion conditions, modes of occurrence, concentrations, and geochemical affinities, are discussed. A new insight into the behavior of potentially deleterious trace elements during combustion is given, which provides further guidance to controlling their emissions.
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