Method for online measurement of the CHON composition of raw gas from biomass gasifier
Journal article, 2014

For unattended biomass gasification processes, rapid methods for monitoring the elemental composition (CHON) of the raw gas leaving the gasifier are needed. Conventional methods rely on time-consuming and costly laboratory procedures for analysing the condensable part of the raw gas. An alternative method, presented in this work, assesses the CHON composition of raw gas in a "one step" analysis without the need to previously characterise its chemical species composition. Our method is based on the quantitative conversion of a raw gas of complex chemical composition into CO2, H2O, and N2 in a small combustor. The levels of these simple species can be measured with high accuracy and good time resolution, and the CHON composition of the raw gas can be determined from the mass balance across the combustor. To evaluate this method, an online combustion facility was built and used to analyse the raw gas from the Chalmers 2-MWth dual fluidised bed steam gasifier. Test runs of the developed facility demonstrated complete combustion of the raw gas and the measurements were both fast and reliable. The new method used in combination with zero-dimensional reactor modelling provides valuable data for the operational monitoring of gasification processes, such as the degree of fuel conversion, composition of the char exiting the gasifier, oxygen transport by catalytic bed material, and amount of condensables in raw gas.

Biomass

Gasification

Method

Tar

Fluidised bed

Gas

Author

Daniel Santos Felix Neves

Chalmers, Energy and Environment, Energy Technology

Henrik Thunman

Chalmers, Energy and Environment, Energy Technology

L.A.C. Tarelho

University of Aveiro

Anton Larsson

Chalmers, Energy and Environment, Energy Technology

Martin Seemann

Chalmers, Energy and Environment, Energy Technology

Arlindo Matos

University of Aveiro

Applied Energy

0306-2619 (ISSN)

Vol. 113 932-945

Subject Categories

Energy Engineering

Areas of Advance

Energy

DOI

10.1016/j.apenergy.2013.08.032

More information

Created

10/7/2017