Ignition characteristics of coal blends in an entrained flow furnace |
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Authors: | J Faúndez F Rubiera A Arenillas AL Gordon |
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Affiliation: | a Departamento de Ingeniería Química, Universidad de Concepción, P.O. Box 160-C, Concepción, Chile b Instituto Nacional del Carbón, CSIC, Apartado 73, 33080 Oviedo, Spain |
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Abstract: | Ignition tests were carried out on blends of three coals of different rank - subbituminous, high volatile and low volatile bituminous - in two entrained flow reactors. The ignition temperatures were determined from the gas evolution profiles (CO, CO2, NO, O2), while the mechanism of ignition was elucidated from these profiles and corroborated by high-speed video recording. Under the experimental conditions of high carbon loading, clear interactive effects were observed for all the blends. Ignition of the lower rank coals (subbituminous, high volatile bituminous) enhanced the ignition of the higher rank coal (low volatile bituminous) in the blends. The ignition temperatures of the blends of the low rank coals (subbituminous-high volatile bituminous) were additive. However, for the rest of the blends the ignition temperatures were always closer to the lower rank coal in the blend. |
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Keywords: | Coal blending Ignition behaviour Entrained flow reactor |
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