期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 37, 期 3, 页码 2681-2688出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.06.042
关键词
Potassium; PLIF; Multi-point LIBS; Kinetics; Mechanism
资金
- National Natural Science Foundation of China [51776185]
- Program of Introducing Talents of Discipline to University [B08026]
- Royal Society
- Engineering and Physical Sciences Research Council (EPSRC) of the UK
Combining polarizing-filtered planar laser-induced fluorescence (PLIF) with simultaneous laser absorption, quantitative laser-induced breakdown spectroscopy (LIBS) and two-color pyrometry, the potassium release during the combustion of biomass fuels (corn straw and poplar) has been investigated. The temporal release profiles of volatile atomic potassium and potassium compounds from a corn straw show a single peak. The woody biomass, poplar, produces a dual-maxima distribution for potassium and potassium compounds. For both biomass samples, the highest concentrations of released atomic potassium and potassium Cornpounds occur in the devolatilization stage. The mass ratios between volatile atomic potassium and potassium compounds in the corn straw and poplar cases are 0.77% and 0.79%, respectively. These values agree well with chemical equilibrium predictions that 0.68% of total potassium will be in atomic form. A two-step kinetic model of potassium release has been developed, which gives better predictions during the devolatilization stage than the existing single-step model. Finally, a map of potassium transformation processes during combustion is developed. Starting with inorganic and organic potassium, there are eight proposed transformation pathways including five proposed release pathways that occur during the combustion. The pathways describe the transformation of potassium between the fuel volatile matter, char, and ash. Potassium release during the devolatilization stage is due to pyrolysis and evaporation; during the char burnout stage, potassium release is due to char oxidation and decomposition; and during the ash cooking stage, potassium release is caused by reactions between the ash and H2O in the co-flow. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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