Evaluation Of Thermodynamic Efficiency
Of Biowaste Gasification
Author(s)
K. J. Ptasinski
Abstract
Concerns about global climate change and depletion of fossil fuels have
increased interest in biomass and other renewable energy sources. Due to
shortage of clean biomass much attention is recently devoted to various biowaste
streams. This paper focuses on biowaste gasification, where the produced
synthesis gas can be subsequently used to produce biofuels, including Fischer-
Tropsch hydrocarbons, methanol and hydrogen. The thermodynamic efficiency
of biowaste gasification is evaluated for various feedstocks using energy and
exergy indicators. It is shown that exergetic efficiency is lower than
corresponding energetic efficiencies. Modification of biomass gasification is
proposed to improve process efficiency. Finally, the conversion efficiency of
overall chains biomass-to-biofuel is discussed.
Keywords: renewable energy, biomass, waste gasification, exergy analysis.
1 Introduction
With declining petroleum resources and concerns about climate change more
attention is now being directed towards sustainable production of chemicals and
transportation fuels. In this respect biomass has neutral CO2 impact and is the
only current sustainable source of carbon. The most promising biomass-to
biofuel route is a two-stage process involving production of syngas from biomass
gasification, followed by synthesis of transportation fuels, involving Fischer-
Tropsch hydrocarbons, methanol, and hydrogen. It was previously demonstrated
that the gassier is one of the least-efficient unit operation in the whole biomassto-
biofuels chain. Therefore, an analysis of the gasifier alone can substantially
contribute to the efficiency improvement of the whole biofuel production
technology.
Keywords
renewable energy, biomass, waste gasification, exergy analysis.
Related Book
Other papers in this volume
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