Pyrolysis of lard was performed in a fixed-bed reactor to produce a diesel-like fuel. Lard was fed into the reactor at 5 g/h using N 2 (3 × 10 -5 -7 × 10 -5 m 3 /min) as carrier gas. The liquid product obtained at a temperature of 600 °C, carrier gas flow rate of 5 × 10 -5 m 3 /min, and quartz packing particle size of 0.7-1.4 mm has a cetane index of 46, specific gravity of 0.86, and a higher heating value of 40 MJ/kg. This study shows that there is a potential for producing diesel-like liquid from pyrolysis of lard. It also identifies the pyrolysis of animal fats as a source of highcalorific-value (68-165 MJ/m 3 ) gaseous fuel.
Waste fryer grease (WFG) is an environmentally preferable option for hydrogen production. In the present work, the pyrolysis of waste fryer grease in the absence of catalyst was studied in a fixed-bed reactor. The effects of various operating parameters such as reaction temperature (650−850 °C), carrier gas (N2) flow rate (30−70 mL/min), and reactor inert packing particle size (0.5−2.5 mm) on hydrogen and syngas (i.e., mixture of H2 + CO) production were studied. Quadratic response surface models used in analyzing the product gas and char data showed that temperature was the most important parameter over the wide range of conditions studied. The effect of particle size on the product gas and char yield was not significant. Residence time influenced both hydrogen and syngas composition, but its effect was smaller than that of temperature. Numerical optimization of the responses gave a composition of 17.8 mol % for hydrogen, 26.6 mol % for syngas, and a char yield of 13.7 g/100 g of waste fryer grease. Steam was introduced in the reaction system to increase the hydrogen production. The addition of steam (a steam to carbon ratio of 1.5) caused a drastic increase in the hydrogen production to a maximum of 56.2 mol % and in syngas to a maximum of 82.4 mol %.
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