Abstract
AbstractParticulate matter emissions are a key issue of modern biomass boilers. A novel gas cleaning method using a metal mesh filter combined with water-based cleaning was developed and tested. The filter was tested batch-wise. Flue gas of a commercial 50-kW boiler was filtered until a pressure drop of 2000 Pa was reached. Afterwards, the filter was regenerated. The initial prototype used ultrasound in order to remove the filter cake from the filter candles. Regeneration was complete and, even after boiler malfunctions producing tar, the filter cake could still be removed. Given the good results, a second cleaning mode, flushing the filter candles with water, was tested. The results were as good as with ultrasonic cleaning. Peak mass collection efficiency was very high with 98 ± 2% (burning wood pellets). However, directly after cleaning, the first layer of filter cake has to be developed. In this initial phase, collection efficiency is low. Service time until maximum pressure drop was reached depended on the gas velocity. Using pellets as fuel, at a gas velocity of 66.6 m/h, 12-h service time was reached and 4.1 g dust was collected per square meter filter surface, while at 33.3 m/h, service time increased to 55 h and collected dust to 13.9 g/m2. Using low-quality wood chips, the raw gas dust loading was much higher but also the maximum loading of the filter was higher with 13.3 to 28.9 g dust separated per square meter. Still, the service time decreased to 3.4 respective 38 h. Peak collection efficiency increased to 99.5 ± 0.8%. The overall collection efficiency including the buildup of the filter cake depends on the gas velocity and fuel. It ranges from 74 ± 4 to 91 ± 1%. The feasibility of the filter concept could be proven, and further development towards a commercial application is in progress. Metal mesh filters with countercurrent cleaning showed a high potential given their simple and robust design, as well as high collection efficiency.
Funder
Fachagentur Nachwachsende Rohstoffe
Publisher
Springer Science and Business Media LLC
Subject
Renewable Energy, Sustainability and the Environment
Reference47 articles.
1. Gaderer M (2016) Abgasreinigung. In: Kaltschmitt M, Hartmann H, Hofbauer H (eds) Energie aus Biomasse, 3., aktualisierte Aufl. 2016. Springer Berlin Heidelberg; Imprint: Springer Vieweg, Berlin, Heidelberg, pp 936–972
2. Lewtas J (2007) Air pollution combustion emissions: characterization of causative agents and mechanisms associated with cancer, reproductive, and cardiovascular effects. Mutat Res 636(1-3):95–133. https://doi.org/10.1016/j.mrrev.2007.08.003
3. Torres-Duque C, Maldonado D, Pérez-Padilla R et al (2008) Biomass fuels and respiratory diseases: a review of the evidence. Proc Am Thorac Soc 5(5):577–590. https://doi.org/10.1513/pats.200707-100RP
4. Arif AT, Maschowski C, Garra P, Garcia-Käufer M, Petithory T, Trouvé G, Dieterlen A, Mersch-Sundermann V, Khanaqa P, Nazarenko I, Gminski R, Gieré R (1994) (2017) Cytotoxic and genotoxic responses of human lung cells to combustion smoke particles of Miscanthus straw, softwood and beech wood chips. Atmos Environ 163:138–154. https://doi.org/10.1016/j.atmosenv.2017.05.019
5. (2019) Erste Verordnung zur Durchführung des Bundes-Immissionsschutzgesetzes (Verordnung über kleine und mittlere Feuerungsanlagen - 1. BImSchV): 1. BImSchV
Cited by
9 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献