Modeling of hydrodynamics in a bubbling fluidized-bed gasifier and evaluation of the inter-phase gas exchange rate under different operating conditions--颗粒学报PARTICUOLOGY

Das, B., & Datta, A. (2016). Modeling of hydrodynamics in a bubbling fluidized-bed gasifier and evaluation of the inter-phase gas exchange rate under different operating conditions. Particuology, 25, 151-158. https://doi.org/10.1016/j.partic.2015.05.009

Modeling of hydrodynamics in a bubbling fluidized-bed gasifier and evaluation of the inter-phase gas exchange rate under different operating conditions

Bijoy Das ^a, Amitava Datta ^b *

a Development Consultants Pvt. Ltd, Salt Lake City, Kolkata 700 091, India
b Department of Power Engineering, Jadavpur University, Salt Lake Campus, Kolkata 700 098, India

10.1016/j.partic.2015.05.009

Volume 25, April 2016, Pages 151-158

Received 31 October 2014, Revised 18 March 2015, Accepted 22 May 2015, Available online 19 October 2015, Version of Record 18 February 2016.

E-mail: amdatta_ju@yahoo.com

Highlights

• Hydrodynamics in a model bubbling fluidized-bed gasifier were simulated by empirical correlations.

• Effects of gasifier temperature and bed particle size were studied.

• Inter-phase gas exchange rate from emulsion to bubble phase was calculated.

Abstract

A fluid dynamic model of a bubbling fluidized-bed coal gasifier is presented considering two-phase theory of fluidization. The effects of the gasifier temperature and bed particle size on the hydrodynamic characteristics of both the bubble and emulsion phases of the gasifier bed are studied. The bubble diameter, bubble velocity, and bubble area fraction are evaluated for the bubble phase, whereas the gas velocity and porosity are studied for the emulsion phase, along the height of the bed. Finally, the rate of inter-phase gas exchange from the emulsion phase to bubble phase is calculated under different operating conditions.

Graphical abstract

Keywords

Bubbling fluidized bed; Gasifier; Gas exchange rate; Bubble; Emulsion

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