F?xed bed slow pyrolys?s of b?omass sol?d waste for b?o-char

29th Symposium of Malaysian Chemical Engineers 2016

Islam, M.N.^1 ; Ali, M.H.^1 ; Ahmad, I.^1

Mechanical Engineering Programme Area, Universiti Teknologi Brunei, Gadong

BE 1410, Brunei^1

关键词: Biomass feedstock;    Biomass solid wastes;    Higher heating value;    Oxygen bomb calorimeters;    Pyrolysis reactor;    Temperature range;    Vapor residence time;    Water-cooled condenser;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/206/1/012014/pdf
DOI  :  10.1088/1757-899X/206/1/012014

来源: IOP

【 摘 要 】

Biomass solid waste in the form of rice husk particle is pyrolyzed in a fixed bed pyrolysis reactor. The reactor is made of stainless steel with dimensions of 76 mm in diameter and 90 cm in length. Rice husk is collected locally from Brunei-Muara district of Brunei Darussalam which is processed for pyrolysis. The particles are selected in the millimeter range. It is oven-dried at 105°C for 6 hours after being air-dried prior to pyrolysis. The reactor bed is heated by means of saw-dust in a biomass source heater. A temperature range of 390-410°C is maintained with an apperent vapor residence time of 30 min. Nitrogen gas is passed through the reactor system to make the atmosphere inert. A water-cooled condenser is used to derive bio-oil from the condensable vapors. The system is subjected to pyrolysis for a running time of 60 min. The products obtained are solid bio-char, liquid bio-oil and pyrolytic bio-gases. The solid char yield is found to be 45 by weight of solid biomass feedstock and the liquid product yield is found to be 29 by weight of solid biomass feedstock. The rest is gas flared into the atmosphere. The bio-char is retained in the reactor and collected at the end of the experimental run. The bio-char is found to be black in color retaining its original shape. The bio-char product is subjected to energy analysis for its higher heating value (HHV) by means of an oxygen bomb calorimeter. It is found to be 20.3 MJ/kg. The density of the bio-char is found to be 238.5 kg/m3with an energy density of 4.85 GJ/m3.