Journal
FUEL PROCESSING TECHNOLOGY
Volume 128, Issue -, Pages 499-508Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.fuproc.2014.07.038
Keywords
Biomass; Slagging; Ash; KCl; K3Na(SO4)(2)
Funding
- Fundamental Research Funds for the Central Universities at Xi'an Jiaotong University
- National Natural Science Foundation of China [51406149, 51376147]
- China Postdoctoral Science Foundation [2014 T70921]
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To solve the intractable slagging problem in biomass utility boilers, the effects of Si, Al, K, Cl, S, and initial slagging layer on slagging were performed by comparing the distinct slagging characteristics of two cotton stalks. The criterion numbers of slagging, namely, Cl ratio (Cl + K2O + Na2O)/(SiO2 + Al2O3) and S ratio (S-volatile + K2O + Na2O)/(SiO2 + Al2O3), were proposed quantitatively. When Cl ratio and S ratio are higher than 2.4 and 1.9, respectively, the biomass is easy to slag; by contrast, the slagging is low when Cl ratio and S ratio are lower than 1.0 and 0.5, respectively. The slagging growth mechanisms were further improved by coupling the alternating layer structure of the whole slagging, which was formed by the re-enrichment of fine particles that primarily contained high concentrations of K, Na, Cl, and S in the form of MCl and K3Na(SO4)(2) and by the re-capture of coarse large particles that primarily contained higher Si, Al and so on. K3Na(SO4)(2), originated from the interaction between sulfates, promotes the growth of the slagging. Nonetheless, the influence of K3Na(SO4)(2) on slagging is minimal in comparison with KCl. The disruption or inhibition of initial slagging layer significantly weakens slagging. (C) 2014 Elsevier B.V. All rights reserved.
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