Numerical Modelling and Experimental Verification of the Low-Emission Biomass Combustion Process in a Domestic Boiler with Flue Gas Flow around the Combustion Chamber

Przemysław Motyl, Danuta Król, Sławomir Poskrobko and Marek Juszczak
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Przemysław Motyl: Faculty of Mechanical Engineering, University of Technology and Humanities in Radom, 26-600 Radom, Poland
Danuta Król: Faculty of Energy and Environmental Engineering, Silesian University of Technology, 14-100 Gliwice, Poland
Sławomir Poskrobko: Faculty of Civil Engineering and Environmental Sciences, Białystok University of Technology, 15-351 Białystok, Poland
Marek Juszczak: Faculty of Environmental Engineering and Energy, Poznan University of Technology, 60-965 Poznań, Poland

Energies, 2020, vol. 13, issue 21, 1-16

Abstract: The paper presents the results of numerical and experimental studies aimed at developing a new design of a 10 kW low-emission heating boiler fired with wood pellets. The boiler is to meet stringent requirements in terms of efficiency (η > 90%) and emissions per 10% O 2 : CO < 500 mg/Nm 3 , NOx ≤ 200 mg/Nm 3 , and dust ≤ 20 mg/Nm 3 ; these emission restrictions are as prescribed in the applicable ECODESIGN Directive in the European Union countries. An innovative aspect of the boiler structure (not yet present in domestic boilers) is the circular flow of exhaust gases around the centrally placed combustion chamber. The use of such a solution ensures high-efficiency, low-emission combustion and meeting the requirements of ECODESIGN. The results of the numerical calculations were verified and confirmed experimentally, obtaining average emission values of the limited gases CO = 91 mg/Nm 3 , and NOx = 197 mg/Nm 3 . The temperature measured in the furnace is 450–500 °C and in the flue it was 157–197 °C. The determined boiler efficiency was 92%. Numerical calculations were made with the use of an advanced CFD (Computational Fluid Dynamics) workshop in the form of the Ansys programming and a computing environment with the dominant participation of the Fluent module. It was shown that the results obtained in both experiments are sufficiently convergent.

Keywords: biomass combustion; pellet boiler; CFD modeling; renewable heating (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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