BORAH , R C and GHOSH , PALLAB and Rao, P G (2008) Devolatilization of coals of North-Eastern India under fluidized bed conditions in oxygen-enriched air. Fuel Processing Technology, 89 (12). pp. 1470-1478.

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Oxygen-enriched air can increase the combustion efficiency, boiler efficiency, and sulfur absorption efficiency of atmospheric fluidized bed combustion (AFBC) boilers which use high-sulfur coal, and other combustion systems that use coal. Devolatilization is the first step in the gasification or combustion of coal. In this work, devolatilization characteristics of five run-of-mine (ROM) coals of North-Eastern India having particle-size between 4mmand 9 mm are reported. The experiments were performed under fluidized bed conditions at 1123 K in enriched air containing 30% oxygen. The devolatilization time was correlated with the particle diameter by a power law correlation. The variation of mass with time was correlated by an exponential correlation. It was observed that the average ratio of yield of volatile matter to the proximate volatile matter decreased with the increase in volatilecontent of the coals. A shrinking-core model was used to determine the role of filmdiffusion, ash-diffusion and chemical reaction. The experimental results indicate the likelihood of film-diffusion to be the rate-controlling mechanism in presence of oxygenenriched air. A cost-analysis was carried out to study the economy of the process

Item Type: Article
Subjects: Chemistry > Organic Chemistry
Depositing User: Dr. PK Barooah
Date Deposited: 28 Dec 2011 10:27
Last Modified: 28 Dec 2011 10:27

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