Coal is a prime energy source in India and will continue to play its role for coming several decades. However, our indigenous coal suffers from high ash content and present coal based conventional power generation technologies have several drawbacks such as, lower efficiency, environmental loading and damages thereof. Herein the importance of gasification lies because coal gasification is a mea...

In this paper, combustion of char in the riser of circulating fluidized bed was modeled using ASPEN PLUS. Since physical and chemical phenomena are involved in the process, the model integrates the two-phase hydrodynamic sub-model with the reaction sub-model derived from the literature. In the proposed model, the fluidized bed is divided into several sections and the behavior of each section wa...

This paper focuses on the determination of the solid circulation of a CFB gasification system with a dual fluidized bed concept and the distribution of the solid hold up at different fluidization conditions. A mathematical model of the riser was designed and implemented in a model of a dual fluidized bed system. This model contains routines for calculation of each section of the dual fluidized ...

The present study is in two parts, the first part describes an investigation that was undertaken to determine the feasibility and hydrodynamic behaviour of a cold model circulating fluidized bed system proposed for the continuous combustion-gasification of biomass. The design is based on the principle that the char produced in the gasifier is circulated with the bed material and combusted in a ...

In this study, a Eulerian-Eulerian liquid-solid two-phase flow model combined with kinetic theory of granular was established to study the hydrodynamic characteristics and fluidization behaviors coarse coal particles in 3D fluidized bed. First, grid independence analysis conducted select appropriate parameters. Then, developed computational fluid dynamics (CFD) validated by comparing experiment...

Fluidized bed was employed to investigate propane steam reforming over Ni-K/CeO2-Al2O3 catalyst. The catalyst was characterized by XRD, SEM, TG/DTA, and N2 adsorption-desorption tests. Effects of promoters, space velocity, temperature, and steam/propane (S/C) ratio on propane conversion, H2 yield, H2/CO ratio, and stability were studied and discussed. The experiments were carried out under cond...

In this study, Malaysian dolomites as secondary catalysts are placed at the downstream of fluidized-bed gasifier. Three types with different elemental ratios CaO-MgO content denoted P1, P2, and P3 investigated EFB gasification reaction cracking temperatures (700–900 °C). The performance a variation catalyst to biomass weight ratio (C/B) (0.05 0.30 w/w) is evaluated. findings showed that total g...