Properties of the Particles Attaining the Heat Exchangers in Kraft Recovery Boiler, 1998 International Chemical Recovery Conference Proceedings

In order to predict the deposit formation in the recovery boiler, advanced modeling tools are required. Current models for the deposit formation need experimental data on the coarse fly ash particles (diameter > 3 µm), since no validated formation model has been reported for them. On the other hand, a formation model for the fine fume particles (diameter < 3="" µm)="" has="" been="" established="" and="" validated="">

In this work, the characteristics of recovery boiler flue gas particles were studied experimentally in the furnace. The particles were extracted from the flue gas with a quench probe and subsequently collected on a planar filter or size classified with a Berner type low pressure impactor. In addition, individual particles were collected with a settling probe and a cooled grid sampler. The particle characterisation was carried out by analysing the samples with ion chromatography, X-ray absorption of fine structure, and a scanning electron microscope along with an energy dispersive X-ray analysis system.