Determination Of Thermo-Physical Properties Of Forty Day Incubation Cattle Dung Biogas

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 Determination Of Thermo-Physical Properties Of Forty Day Incubation Cattle Dung Biogas

Journal Title: Applied Science Reports - Year 2014, Vol 8, Issue 3

Abstract

 This paper dwells on the determination of some thermo-physical properties of cattle dung biogas. Such properties include the specific biogas constant (R), the specific heat capacities at constant volume (Cv) and constant pressure (Cp), specific internal energy (u), specific enthalpy (h) and the ratio of the specific heats (δ). Eighteen kilogram (18 kg) of cattle dung mixed with 36 kg of water was charged into a digester made of mild steel of 2 mm thickness. The slurry was made up to three quarter of the digester volume of 0.09 m3 was then subjected to anaerobic digestion for forty days. The digester temperature was monitored daily at 12 noon. The biogas generated, after test for combustion, was refined through aqueous sodium hydroxide and then through water. The raw and the refined biogases were analyzed with gas chromatography using the thermal conductivity detector (TCD). The results showed that the raw biogas comprised CH4, CO2, H2S, CO and NH3 with respective moles as 0.586, 0.372, 0.016, 0.02 and 0.006 while the moles of the refined biogas in the same order were 0.791, 0.183, 0.004, 0.016 and 0.005. The raw biogas had R, Cv, Cp and δ respectively as 0.3084972 kJ/kgK, 0.9224067 kJ/kgK, 1.230904 kJ/kgK and 1.334448. The values of these properties for the refined biogas were 0.3882944 kJ/kgK, 1.161392 kJ/kgK, 1.549686 kJ/kgK and 1.334335. The highest and lowest specific internal energies of the raw biogas were 279.48923 kJ/kg and 273.95479 kJ/kg while the specific enthalpies were 372.96391 kJ/kg and 365.57849 kJ/kg respectively. The refined biogas had its highest specific internal energy and enthalpy as 351.90178 kJ/kg and 469.55486 kJ/kg and the lowest for the same parameters as 344.93342 kJ/kg and 460.25674 kJ/kg respectively.

Authors and Affiliations

S. S Yaru , I. K Adegun , M. A Akintunde

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EP ID EP142485
DOI 10.15192/PSCP.ASR.2014.4.3.168174
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