Abstract
Wood is a renewable fuel, however the combustion of wood can lead to significant dust emissions. The application of fabric filters is one possibility to ensure low particulate matter emissions. Nevertheless, these filters are so far not used for small-scale firing systems. In this work, the mitigation potential of a newly developed fabric filter concept with pulse-jet regeneration, based on a stainless-steel mesh was studied. The filter was tested on a commercially available 24 kW biomass boiler, which was operated with wood pellets and wood chips. Experiments showed a linear dependency of the separation efficiencies and clean gas concentrations on average pressure drop while a logarithmic dependency of the clean gas concentrations on an empirical factor k was proven. The filter showed good regenerability and dust separation efficiencies up to 83 % and 90 % during combustion of wood pellets and wood chips. The pulse-jet regeneration showed a short-time peak of dust emissions behind the filter which can represent between 24 and 60 % of the total dust emissions during a whole filtration cycle. Nevertheless, the application of different filters with 25 and 50 μm mesh size guarantees an efficient dust removal. In a first phase during filter cake formation, the concentrations can exceed the limit value, but once a filter cake had built up, the concentrations drop drastically below 0.01 g m−3. In summary, the filters show good regenerability and efficient dust separation and thus further development potential.
Published Version
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