File Name: biomass gasification and pyrolysis practical design and theory .zip
This paper focuses on a two-dimensional CFD simulation of a downdraft gasifier and a pilot-scale experiment for verification using wood pellet fuel. Three gasification parameters were taken into account in the simulation and validation to achieve highly accurate results; namely, fuel consumption, temperature profile, and syngas composition. After verification of the developed model, the effects of aspect ratios on temperature and syngas composition were investigated. Results from simulation and experimental work indicated that the fuel consumption rate during the steady state gasification experiment was 1. The average steady state temperature of the experiment was
Currently, small-scale distributed power generation is being intensively developed in Russia and abroad. Given the rise in the rates for the electric and thermal energy, the development of new territories, and the technical infeasible connection to the power supply system, one of the most promising variants of supplying isolated consumers with power is the application of wood biomass gasification technologies. Analysis of the studies in this sphere shows that considerable attention is paid to enhancing the gasification efficiency and ensuring the purity of the gas. These problems are solved using multistage gasification technology. This technology involves the pyrolysis and gasification in separated zones of the gasifier or individual interconnected reactors, which enables achieving the optimal conditions for the conversion of biomass at every separate stage. The major advantage of multistage gasifiers is the production of synthesis gas with a low content of tar. The article represents a review of technologies for multistage wood biomass gasification and comparison of the relevant gasifiers of various types; the basic single-stage and multistage wood biomass gasification technologies are examined and their technical characteristics and examples of their commercial implementation are provided.
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Biomass Gasification, Pyrolysis and Torrefaction, Third Edition, is enhanced with a new topic on processing and cleaning of product gas of gasification and a brief introduction to biomaterials, making it a versatile resource that not only explains the basic principles of energy conversion systems, but also provides valuable insight into the design of a complete biomass conversion systems. With a dedicated focus on the design, analysis and operational aspects of biomass gasification, pyrolysis and torrefaction, this edition offers comprehensive coverage of biomass in its gas, liquid or solid states in a single accessible source. The author provides many worked design problems, step-by-step design procedures and real data on commercially operating systems. This book will help engineers, scientists and operating personnel of biomass gasification, pyrolysis or torrefaction plants, gain better comprehension of the basics of biomass conversion. Biomass Gasification, Pyrolysis and Torrefaction, Third Edition, is enhanced with a new topic on processing and cleaning of product gas of gasification and brief introduction to biomaterials making it a versatile resource that not only explains the basic principles of energy conversion systems, but also provides valuable insight into the design of a complete biomass conversion systems.
Gasification technology plays a significant role to increase the potential exploitation of agro-waste products. This technology can convert solid dried biomass into a combustible gas, widely called syngas or producer gas. Producer gas can be used to run a diesel engine in a dual fuel mode to partially reduce diesel fuel consumption. However, determination of the dimensions of a gasifier and gas cleaning elements for a pre-specified capacity of a pilot-scale diesel engine remains unexplored. This study, therefore, intends to provide a heuristic concept to avoid an oversize, cumbersome design of a gasifier and a gas cleaning unit based on basic theory.
This work investigates the potential of coconut shell for air-steam gasification using thermodynamic equilibrium model. A thermodynamic equilibrium model considering tar and realistic char conversion was developed using MATLAB software to predict the product gas composition. After comparing it with experimental results the prediction capability of the model is enhanced by multiplying equilibrium constants with suitable coefficients.
This work investigates the potential of coconut shell for air-steam gasification using thermodynamic equilibrium model. A thermodynamic equilibrium model considering tar and realistic char conversion was developed using MATLAB software to predict the product gas composition. After comparing it with experimental results the prediction capability of the model is enhanced by multiplying equilibrium constants with suitable coefficients. The modified model is used to study the effect of key process parameters like temperature, steam to biomass ratio, and equivalence ratio on product gas yield, composition, and heating value of syngas along with gasification efficiency. For a steam to biomass ratio of unity, the maximum mole fraction of hydrogen in the product gas is found to be Gasification is a thermochemical process by which low energy density fuels like biomass can be converted into gaseous fuels with the aid of a series of chemical reactions.
Biomass gasification is a widely used thermochemical process for obtaining products with more value and potential applications than the raw material itself. Cutting-edge, innovative and economical gasification techniques with high efficiencies are a prerequisite for the development of this technology. This paper delivers an assessment on the fundamentals such as feedstock types, the impact of different operating parameters, tar formation and cracking, and modelling approaches for biomass gasification. Furthermore, the authors comparatively discuss various conventional mechanisms for gasification as well as recent advances in biomass gasification. Unique gasifiers along with multi-generation strategies are discussed as a means to promote this technology into alternative applications, which require higher flexibility and greater efficiency.
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