Impactor measurements in the joint power plant
Dr. Robert Daschner, Head of the Thermal Processes Department, presented the results of the project »Impact measurements in the flue gas line of a waste and coal line of the GKS-Schweinfurt« at the 15th VDI Conference »Firing and Boiler - Deposits and Corrosion - in Large Combustion Plants« on 14.06.2016 in Berlin.
The measurements were carried out at the community power plant Schweinfurt (GKS), which has both a waste part and a coal part.
In the waste section, the SNCR technology is used for denitrification and multi-cyclone, spray dryer, fabric filter and scrubber for further cleaning of the flue gas. In the carbon part SNCR, cyclone, dry sorption and fabric filter.
Measurements were carried out along the flue gas path with the aid of low-pressure cascade impactors in both the waste and coal sections. »The measurement with an impactor not only makes it possible to record the particle size distribution, but also, due to the collecting sampling, to carry out comprehensive, more extensive analysis,« explains Martin Meiller, Group Manager Energy from Biomass and Waste. This allows investigations into the morphology and chemical composition of the particles to be carried out.
»The impact measurements at the Schweinfurt GKS joint venture power plant were carried out at one line each in the waste and coal sections and at three different points each in the flue gas path to the chimney,« explains Martin Meiller. In addition, a measurement took place in the coal section after desulphurisation and in the waste section after the multi-cyclone. The team around Dr. Robert Daschner evaluated the generated samples gravimetrically and then analyzed them with the help of the SEM and EDX. In addition, measurements were carried out during soot blowing, a process for cleaning the plant. The measurements showed that despite an increase in the raw gas concentration, the particle concentration returned to normal already after the cyclone.
»We want to keep the emissions of our power plant as low as possible, despite the already high standards. The measurements provide us with an even more detailed insight into the processes in our flue gas cleaning«, says Dr.-Ing. Ragnar Warnecke, head of the power plant, satisfied with the work of Fraunhofer UMSICHT.
Further measurements to investigate direct desulphurisation are to follow in autumn 2016.