Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Year 2022, , 544 - 555, 31.08.2022

Bilal Sungur

https://doi.org/10.18185/erzifbed.1039313

Abstract

Experimental Investigation of the Effect of Feeding System on the Performance at Pellet-Fuelled Boilers

Abstract

Depending on the growing industry and the population, energy needs are increasing day by day. This issue makes it necessary the use of renewable energy sources as much as possible. There is a growing interest in pellet fuel and pellet-fired combustion systems, which are one of the renewable energy sources. In this work, performance analyzes of pellet-fueled boilers with two different feeding systems (horizontal-fed and top-fed) and two different flue gas outlet positions were carried out and results were discussed. Emissions of O2, CO2, CO and NOx and flue gas temperature were measured at a certain point of the chimney. Boiler thermal efficiencies were calculated and compared with each other. Direct and indirect methods were used to calculate thermal efficiency of boilers. Results showed that the flue gas temperatures were about 110 °C in the top-fed boiler and 138 °C in the horizontal-fed boiler. The thermal efficiency of top-fed boiler was higher than horizontal-fed boiler. In the top-fed boiler, CO and NOx emissions were lower than the horizontal-fed boiler. Generally, the top-fed boiler showed better performance and lower emission characteristics than horizontal-fed boiler.

Keywords

Biofuels, pellet, pellet boilers, boiler design, pellet feeding systems

References

• Aung, T. W., Baumgartner, J., Jain, G., Sethuraman, K., Reynolds, C., Marshall, J. D., & Brauer, M. (2018). Effect on blood pressure and eye health symptoms in a climate-financed randomized cookstove intervention study in rural India. Environmental Research, 166, 658–667. https://doi.org/10.1016/j.envres.2018.06.044
• Bates, M. N., Pokhrel, A. K., Chandyo, R. K., Valentiner-Branth, P., Mathisen, M., Basnet, S., … Smith, K. R. (2018). Kitchen PM2.5 concentrations and child acute lower respiratory infection in Bhaktapur, Nepal: The importance of fuel type. Environmental Research, 161, 546–553. https://doi.org/10.1016/j.envres.2017.11.056
• Bond, T. C., Doherty, S. J., Fahey, D. W., Forster, P. M., Berntsen, T., Deangelo, B. J., … Zender, C. S. (2013). Bounding the role of black carbon in the climate system: A scientific assessment. Journal of Geophysical Research Atmospheres, 118(11), 5380–5552. https://doi.org/10.1002/jgrd.50171
• Bonjour, S., Adair-Rohani, H., Wolf, J., Bruce, N. G., Mehta, S., Prüss-Ustün, A., … Smith, K. R. (2013). Solid fuel use for household cooking: Country and regional estimates for 1980-2010. Environmental Health Perspectives, 121(7), 784–790. https://doi.org/10.1289/ehp.1205987
• Carroll, J. P., Finnan, J. M., Biedermann, F., Brunner, T., & Obernberger, I. (2015). Air staging to reduce emissions from energy crop combustion in small scale applications. Fuel, 155, 37–43. https://doi.org/https://doi.org/10.1016/j.fuel.2015.04.008
• Deng, M., Li, P., Shan, M., & Yang, X. (2020). Optimizing supply airflow and its distribution between primary and secondary air in a forced-draft biomass pellet stove. Environmental Research, 184, 109301. https://doi.org/https://doi.org/10.1016/j.envres.2020.109301
• Khodaei, H., Guzzomi, F., Patiño, D., Rashidian, B., & Yeoh, G. H. (2017). Air staging strategies in biomass combustion-gaseous and particulate emission reduction potentials. Fuel Processing Technology, 157, 29–41. https://doi.org/https://doi.org/10.1016/j.fuproc.2016.11.007
• Kilic, G., Sungur, B., Topaloglu, B., & Ozcan, H. (2018). Experimental analysis on the performance and emissions of diesel/butanol/biodiesel blended fuels in a flame tube boiler. Applied Thermal Engineering, 130. https://doi.org/10.1016/j.applthermaleng.2017.11.006
• Lamberg, H., Tissari, J., Jokiniemi, J., & Sippula, O. (2013). Fine Particle and Gaseous Emissions from a Small-Scale Boiler Fueled by Pellets of Various Raw Materials. Energy & Fuels, 27(11), 7044–7053. https://doi.org/10.1021/ef401267t
• Li, Y., Lin, Y., Zhao, J., Liu, B., Wang, T., Wang, P., & Mao, H. (2019). Control of NOx emissions by air staging in small- and medium-scale biomass pellet boilers. Environmental Science and Pollution Research, 26(10), 9717–9729. https://doi.org/10.1007/s11356-019-04396-8
• Qiu, G. (2013). Testing of flue gas emissions of a biomass pellet boiler and abatement of particle emissions. Renewable Energy, 50, 94–102. https://doi.org/https://doi.org/10.1016/j.renene.2012.06.045
• Sungur, B., & Topaloglu, B. (2019). An experimental investigation of the effect of smoke tube configuration on the performance and emission characteristics of pellet-fuelled boilers. Renewable Energy, 143. https://doi.org/10.1016/j.renene.2019.05.006
• Woodward, A., Baumgartner, J., Ebi, K. L., Gao, J., Kinney, P. L., & Liu, Q. (2019). Population health impacts of China’s climate change policies. Environmental Research, 175, 178–185. https://doi.org/10.1016/j.envres.2019.05.020
• Zadravec, T., Rajh, B., Kokalj, F., & Samec, N. (2021). Influence of air staging strategies on flue gas sensible heat losses and gaseous emissions of a wood pellet boiler: An experimental study. Renewable Energy, 178, 532–548. https://doi.org/https://doi.org/10.1016/j.renene.2021.05.150