Secondary effects in sampling ammonia during measurements in a circulationg fluidised-bed combustor
Journal article, 1997

A previous paper presented the results of measuring the ammonia (NH3) concentration in the combustion chamber of a circulating fluidised-bed (CFB) boiler. Two sampling techniques were used: a gas-quenching (GQ) probe where the sample is quenched directly in the probe tip by a circulating trapper solution, and a gas-sampling probe connected to a Fourier-transform infra-red (FTIR) instrument. In this paper, an attempt is made to estimate the influence of potential secondary reactions with NH3 in the GQ probe tip by means of a plug-flow model. The calculations showed that heterogeneous and homogeneous reactions could be of importance to the accuracy of the measurement. This contradicts the almost identical results relative to the parallel FTIR measurement, and the conversion of NH3 is probably overestimated by the model. In addition, transients obtained during the FTIR measurement were used to study the accuracy of the gas-sampling probe.



Fluidised bed combustion

sampling of ammonia


Håkan Kassman

Chalmers, Department of Environmental Inorganic Chemistry

Lars-Erik Åmand

Department of Energy Conversion

Bo G Leckner

Department of Energy Conversion

Journal of the Institute of Energy

70 95-101

Driving Forces

Sustainable development

Subject Categories

Energy Engineering

Chemical Engineering

Other Environmental Engineering

Areas of Advance



Chalmers Power Central

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