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Combustion of a high ash and sulfur containing lignite in a pilot circulating fluidized bed combustor and its pollution characteristics

Authors
Journal
Chemical Engineering and Processing Process Intensification
0255-2701
Publisher
Elsevier
Publication Date
Volume
41
Issue
1
Identifiers
DOI: 10.1016/s0255-2701(00)00154-9
Keywords
  • Circulating Fluidized Bed
  • Combustion
  • Desulfurization
  • Noxemissions

Abstract

Abstract In this study a 50 kW circulating fluidized bed combustor (low velocity regime CBF combustor) was constructed for the combustion of high ash containing lignites. Beypazarý lignite which contains 45% ash and 3.72% sulfur was mixed with limestone and was burnt in this combustor. Emission characteristics were investigated at different Ca/S mole ratios. It was shown that SO 2 removal efficiencies reached values of 98%. At an average bed temperature of 850°C NO x emission levels were found to be around 300 ppm however CO emissions were around 1466 ppm. Temperature variation along the combustor (of 1.8 m in height) was found to be about 140 and 90°C for two different feed points located at 0.17 and 0.52 m above the distributor and two different feedback points located at 0.37 and 0.17 m above the distributor, respectively.

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