Modeling a sugar-cane bagasse gasifier via CFP

Abstract:

Biomass gasification has promising application because it allows sugar-cane bagasse and straw (among other biomasses) to be converted into syngas. The gas in turn can be used in the metallurgical industry for direct reduction of iron ore. IPT has completed recently the conceptual design of a gasification pilot plant to be installed in Piracicaba. This work describes the mathematical modeling of the gasifier. It is a cylindrical entrained flow reactor inside which biomass is converted to hydrogen dioxide and carbon monoxide through incomplete combustion at high temperature (1500ºC) and pressure (40 bar). A 2D axisymmetric mesh was used in commercial finite distance software FLUENT according to a EULER-LAGRANGE method to model gas-particle interaction. The pyrolysis sub-model used a generic molecule CxH2xOx to represent tar. For simplicity, the devolatilization model was single rate dependent. Tar and non condensable gas combustion reaction was taken from literature, as well as char combustion and gasification rates. Biomass characterization was performed at IPT. A sensibility analysis was performed on this data to determination how crucial it was for final results. Different operating conditions with regards to oxygen mass flow, swirl index and particle size distribution were tested and flame temperature profile, energetic efficiency and particle tracks were analyzed.


Reference:
SILVEIRA, João Ricardo Filipini da; CEKINSKI, Efraim; SOUSA, Francisco Domingues Alves de. Modeling a sugar-cane bagasse gasifier via CFP. In:JAPAN-BRAZIL SYMPOSIUM ON DUST PROCESSING ENERGY ENVIRONMENT IN METALLURGICAL INDUSTRIES, 9., 2013, Ouro Preto. Proceedings… p.365-375

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