Interaction between emissions of SO2 and HCl in fluidized bed combustors

W. Xie, K. Liu, W. P. Pan, J. T. Riley

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


The ability to capture SO2 and halogens is one of the most important advantages of fluidized bed combustion (FBC). In order to clarify the affects of chlorine in the absorption of SO2 emission, experiments involving the addition of PVC to coils were carried out using the 0.3 m ID bench scale FBC system at Western Kentucky University. During the experiments, PVC was added to three coals in different percentages, and the mixtures fed into the FBC system. The Ca/S ratio was kept constant at 3:1. The experimental results indicate that chloride addition dramatically decreased the SO2 concentration in flue gases. The sulfur and chlorine contents in both fly ash and bed ash increased. At the same time, the utilization efficiency of calcium increased with an increase in the PVC weight percent. This reduction in SO2 is attributed to more voids on the sorbent particle surface (limestone and/or ash) through transient formation of a mobile halide ion-containing phase (CaCl2), and to the reactions. 4HCl+O2↔2Cl2+2H2O Cl2+SO2+H2O↔2HCl+SO3. A proposed mechanism involving the interaction between SO2 and HCl is discussed in detail.

Original languageEnglish
Pages (from-to)1425-1436
Number of pages12
Issue number12
StatePublished - Oct 1999

Bibliographical note

Funding Information:
The authors wish to thank the United States Department of Energy for the financial support through grant number DE-FG-94PC 94211.

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry


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