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Implementation of a firebed cooling device and its influence on emissions and combustion parameters at a residential wood pellet boiler

Author

Listed:
  • Gehrig, M.
  • Pelz, S.
  • Jaeger, D.
  • Hofmeister, G.
  • Groll, A.
  • Thorwarth, H.
  • Haslinger, W.

Abstract

This study investigates the general concept of reduced firebed temperatures in residential wood pellet boilers. Residential wood pellet boiler development is more and more concerned with inorganic aerosols characterized by a temperature-dependent release from the firebed. Hence, different concepts are applied aiming to reduce firebed temperatures. Unfortunately, these concepts influence not only firebed temperatures, but also other important parameters like air flow rates which may cause unwanted side effects with respect to combustion quality or efficiency. Thus, a new approach was developed solely affecting firebed temperature by implementing a water-based firebed cooling in a 12kW underfeed pellet boiler. The effectiveness of the cooling was monitored by comprehensive temperature measurement in the firebed. The cooling capacity ranged from 0.4kW to 0.5kW resulted in a significant decrease of firebed temperatures. Gaseous emissions remain stable showing no significant changes in major components (O2, CO2, NOx). Furthermore, CO emissions were even reduced significantly by the activated cooling, which was supposedly caused by a stabilized devolatilization due to the firebed cooling. Moreover, the temperature-dependent release of aerosol forming elements was influenced at activated firebed cooling, which is proved by a decrease of 17wt% of dust (Total Suspended Particles; TSP). At the same time the gaseous emissions of HCl increase, supposedly by a reduced potassium release from the firebed to the gas phase and a subsequently different particle formation. The general concept of reduced firebed temperatures proved to be successful decreasing overall aerosol emissions without impacting combustion quality.

Suggested Citation

  • Gehrig, M. & Pelz, S. & Jaeger, D. & Hofmeister, G. & Groll, A. & Thorwarth, H. & Haslinger, W., 2015. "Implementation of a firebed cooling device and its influence on emissions and combustion parameters at a residential wood pellet boiler," Applied Energy, Elsevier, vol. 159(C), pages 310-316.
    • Handle: RePEc:eee:appene:v:159:y:2015:i:c:p:310-316
    DOI: 10.1016/j.apenergy.2015.08.133
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    1. Míguez, J.L. & Morán, J.C. & Granada, E. & Porteiro, J., 2012. "Review of technology in small-scale biomass combustion systems in the European market," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(6), pages 3867-3875.
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    2. Raquel Pérez-Orozco & David Patiño & Jacobo Porteiro & José Luís Míguez, 2020. "Novel Test Bench for the Active Reduction of Biomass Particulate Matter Emissions," Sustainability, MDPI, vol. 12(1), pages 1-13, January.
    3. Wöhler, Marius & Andersen, Jes Sig & Becker, Gero & Persson, Henrik & Reichert, Gabriel & Schön, Claudia & Schmidl, Christoph & Jaeger, Dirk & Pelz, Stefan K., 2016. "Investigation of real life operation of biomass room heating appliances – Results of a European survey," Applied Energy, Elsevier, vol. 169(C), pages 240-249.
    4. Wöhler, Marius & Jaeger, Dirk & Reichert, Gabriel & Schmidl, Christoph & Pelz, Stefan K., 2017. "Influence of pellet length on performance of pellet room heaters under real life operation conditions," Renewable Energy, Elsevier, vol. 105(C), pages 66-75.
    5. Zhu, Youjian & Yang, Wei & Fan, Jiyuan & Kan, Tao & Zhang, Wennan & Liu, Heng & Cheng, Wei & Yang, Haiping & Wu, Xuehong & Chen, Hanping, 2018. "Effect of sodium carboxymethyl cellulose addition on particulate matter emissions during biomass pellet combustion," Applied Energy, Elsevier, vol. 230(C), pages 925-934.
    6. Wang, Zhiwei & Lei, Tingzhou & Yang, Miao & Li, Zaifeng & Qi, Tian & Xin, Xiaofei & He, Xiaofeng & Ajayebi, Atta & Yan, Xiaoyu, 2017. "Life cycle environmental impacts of cornstalk briquette fuel in China," Applied Energy, Elsevier, vol. 192(C), pages 83-94.
    7. Pérez-Orozco, Raquel & Patiño, David & Porteiro, Jacobo & Míguez, José Luis, 2020. "Bed cooling effects in solid particulate matter emissions during biomass combustion. A morphological insight," Energy, Elsevier, vol. 205(C).
    8. César Álvarez-Bermúdez & Sergio Chapela & Luis G. Varela & Miguel Ángel Gómez, 2021. "CFD Simulation of an Internally Cooled Biomass Fixed-Bed Combustion Plant," Resources, MDPI, vol. 10(8), pages 1-19, July.
    9. Jaworek, A. & Sobczyk, A.T. & Marchewicz, A. & Krupa, A. & Czech, T., 2021. "Particulate matter emission control from small residential boilers after biomass combustion. A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 137(C).
    10. Miguel-Angel Perea-Moreno & Francisco Manzano-Agugliaro & Alberto-Jesus Perea-Moreno, 2018. "Sustainable Energy Based on Sunflower Seed Husk Boiler for Residential Buildings," Sustainability, MDPI, vol. 10(10), pages 1-20, September.

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