CURRICULUM VITAE OF DR. RAVI KUMAR MADUGULA (original) (raw)

Modelling and Simulation of a Bubbling Fluidized Bed Gasifier

Bubbling fluidized beds are commonly used for small to medium scale capacities. Gasification being order of magnitude slower than combustion process, handling it in fluidized bed gasifier pose many challenges as it may lead to loss of efficiency, unburnt carbon and so on. Hence study of fluidized bed gasifier is important from aspects like gas-solid hydrodynamics, reaction kinetics and inter-phase mass transfer that control the overall performance of the gasifier unit. In this paper, the objective of the study is to develop method for predicting the performance of the bubbling fluidized bed gasifier. This will critically evaluate the various correlations/methods available in literature which enables the research/ process designer to predict the performance of bubbling fluidized bed gasifier. The overall methodology will be to perform cold flow experiments with appropriate representative particles and generate the related information. Numerical model will be developed for bubbling fluidized bed gasifier and its validation will be performed based on experimental data.

Simulations of a Plant with a Fluidized Bed Gasifier WGS and PSA

Nowadays the renewable energy has an even more important role. In particular, among these, in the European countries the energetic valorisation of biomass is very important. In this way also waste biomass become an economic and environmental resource to produce both energy and energy vectors, as hydrogen. The aim of this work has been the evaluation of the hydrogen production in a gasifier plant simulations. Using ChemCAD software simulations of a plant composed of a double bubbling fluidized bed combustor and steam gasifier with catalytic filters candles, HT/LT-WGSR and PSA have been carried out. In these tests the steam to biomass ratio and the operating gasifier temperature have been changed. 1462 M. Moneti et al. The simulation results show that to increase the hydrogen yield the optimal operating conditions should be characterized by high gasification temperature, high steam to biomass ratio and operation of the water gas shift reactors with an excess of steam. Therefore best results have been reached at 850°C with a steam to biomass ratio of 2.

Fluid Dynamic Investigation of an Internal Circulating Fluidized Bed Gasifier by Cold Model

International Energy Journal, 2012

Fluid dynamic behaviour of mineral bed and biomass particles in a steam/oxygen injected gasifier of thermal capacity 1 MW, having two interconnected fluidized chambers and investigated experimentally using a cold model, has been discussed in the present communication. It was ascertained that the architecture of reactor allows, using different fluidizing rates of gasifying agents in the two chambers, to the mineral particles to flow from the less fluidized chamber to the more fluidized one throughout the interconnection window at the bottom of the separating plate, and from the more fluidized chamber to the less one jumping the same plate. In this way the biomass particles despite of their lower density compared to the mineral bed are forced to sink in it, because of the flow direction of the sand particles. The distribution of biomass particles in the bed reactor results more uniform compared to a traditional fluidized bubbling bed reactor, so the elutriation phenomena of mineral an...