Effect of combustion zone material on the thermal performance of a biogas-fuelled porous media burner: Experimental stud
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ORIGINAL ARTICLE
Effect of combustion zone material on the thermal performance of a biogas-fuelled porous media burner: Experimental studies Sangjukta Devi 1 & Niranjan Sahoo 1 & P. Muthukumar 1 Received: 21 July 2020 / Revised: 19 September 2020 / Accepted: 9 October 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The performance of a porous media burner (PMB) is immensely dependent on the selection of porous material. Present experimental work investigates the impact of burner’s material on the thermal performance of a crude biogas-fuelled, in house developed PMB. This includes the study of burner stable operating limits, location of reaction zone, estimation of radiation efficiency and exhaust gas emission analysis. The PMB consists of two sections of porous material, one is the combustion zone and the other is the preheat zone. In the present research, the impact of combustion zone material on performance of the PMB is tested, while keeping the material of preheat zone unchanged. Silicon carbide (SiC) and zirconia (ZrO2) foams, both having porosity of 10 ppi, have been chosen as combustion zone. Experimental investigation shows that for the whole input load range of 5–10 kW, the SiC foam offered lean working condition, while in case of ZrO2, similar condition was limited to 5–8 kW. Within these stable operating limits, the axial temperature mapping of the burner highlights the location of reaction zone. Combustion in SiC foam is found to offer higher radiation efficiency of maximum 23.7%, as compared to that of ZrO2, where it is only 8%. Exhaust gas analysis shows that CO and NOx concentrations of both burners were low and the maximum values were limited to 156 ppm and 20 ppm, respectively. Overall performance assessment confirms that SiC is a better choice over ZrO2 for lean combustion of crude biogas in the developed PMB. Keywords Crude biogas . Porous media burner . Flame stability . Combustion zone . Radiation efficiency . Emissions Nomenclature ABS Burner surface area (m2) Al2O3 Alumina C Specific heat (J/kg K) CZ Combustion zone H Enthalpy (J/kg) IC Internal combustion LCV Low calorific value (J/kg) m• Mass flow rate (kg/s) MFM Mass flow meter PM Porous media
* Sangjukta Devi [email protected] Niranjan Sahoo [email protected] P. Muthukumar [email protected] 1
Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati, India
PMB ppm PZ SiC ZrO2 T V•
Porous media burner Parts per million Preheating zone Silicon carbide Zirconia Temperature (°C) Volumetric flow rate (m3/s)
Greek symbols ϕ Equivalence ratio ε Emissivity of ceramic α Mole fraction η Efficiency (%) σ Stefan-Boltzmann constant (W/m2 K4)
Subscripts rad Radiation surf Surface surr Surrounding
Biomass Conv. Bioref.
1 Introduction Low calorific value (LCV) fuel combustion has gained huge attention amongst the research community in the recent past years. Strain on fossil energy all over the globe is the driving force behind studies on applications of non-conventional energy systems
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