A biomass gasification model was developed using Aspen Plus based on the Gibbs free energy minimization method. This model aims to predict and analyze the biomass gasification process using the blocks of the RGibbs reactor and the RYield reactor. The model was modified by the incomplete equilibrium of the RGibbs reactor to match the real processes that take place in a rice husk gasifier. The mo...

Abstract Using a newly developed experimental setup, the features and advantages of an autothermal single-casing atmospheric subbituminous coal fluidized bed air-blown gasifier, combining combustion gasification section, mixing dispersed phase (inert material, char) heat exchange between them through annular transfer device, have been revealed. To increase efficiency experimental-computational ...

............................................................................................................................. xi CHAPTER 1: INTRODUCTION ................................................................................................ 1 1.1 Motivation ............................................................................................................................. 1 1....

The particle pressure is the surface force that is exerted due to the motion of particles and their interactions. This paper describes measurements of the particle pressure exerted on the sidewall of a gas-fluidized bed. As long as the bed remains in a packed state, the particle pressure decreases with increasing gas velocity as progressively more of the bed is supported by fluid forces. It app...

A one-dimensional kinetic model for steam?oxygen gasification of refuse derived fuel in a bubbling fluidized bed reactor has been developed. The incorporates the reaction network within fluid dynamics to predict waste and tars conversion, gas composition overall performance. was validated by comparing outlet products temperature profile with experimental data from pilot-scale gasifier, operated...

In this paper, the effect of fluidized bed temperature on primary fragmentation of Huadian oil shale was investigated experimentally in thermal state using a small-scale fluidized bed with N2 as fluidizing gas. The fluidized-bed temperatures changed from 600 °C to 1000 °C. Experimental results indicate that the fluidized bed temperature is an important factor of primary fragmentation of oil sha...

An accurate prediction of the minimum fluidization velocity is a crucial hydrodynamic aspect of the design of fluidized bed reactors. Common approaches for the prediction of the minimum fluidization velocities of binary-solid fluidized beds are first discussed here. The data of our own careful experimental investigation involving a binary-solid pair fluidized with water is presented. The effect...

Biomass energy is the oldest energy source used by humans. Biomass has evolved as one of the most promising sources of fuel for the future1. This has spurred the growth of research and development efforts in both federal and private sectors. This impetus is motivated by several factors; dwindling fossil fuels and thus an increased need of energy security, environmental concerns and promotion of...

The history of fluidized bed technology dates back 60 years. Gasification of pulverized coal in the Winkler process during the 1920's marked the beginning of fluidized bed application. Consider­ ,able work done during World War II by U.S. oil companies to improve the catalytic cracking of kerosene led to the development of the Fluid Catalytic Cracking process. Fluidized bed technology later exp...