Secondary effects in sampling ammonia during measurements in a circulating fluidised-bed combustor

摘要

A previous paper presented the results of measuring the ammonia (NH_3) 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 HN_3 in the GQ probe tip by means of a plug-flow model.