Secondary effects in sampling ammonia during measurements in a circulationg fluidised-bed combustor
Artikel i vetenskaplig tidskrift, 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.

FTIR

probes

Fluidised bed combustion

sampling of ammonia

Författare

Håkan Kassman

Chalmers, Institutionen för oorganisk miljökemi

Lars-Erik Åmand

Institutionen för energiomvandling

Bo G Leckner

Institutionen för energiomvandling

Journal of the Institute of Energy

70 95-101

Drivkrafter

Hållbar utveckling

Ämneskategorier

Energiteknik

Kemiteknik

Annan naturresursteknik

Styrkeområden

Energi

Infrastruktur

Chalmers kraftcentral