Keywords : Pyrolisis, coal
Dwi Aries Himawanto, Indarto, Harwin Saptoadi, Tri Agung Rohmat
LPPM UNS, DP2M, Penelitian, Hibah Bersaing, 2009
The objective of this research is to find appropriate slow pyrolysis technology of segregated MSW in order to produce alternative solid fuel which called artificial coal, that suggested can substitute coal.
The material of this research consists of bamboo from traditional basket waste, banana leaves from traditional food wrapping, styrofoam food wrapping and plastic wrapping waste. The material choices based on the unprosessing waste. The samples were collected, dried until the moisture contents of not more than 12 % and crushed until passing 20 mesh sieves. After word the samples were proximate and heating value analysed then characterized in self manufactured macro balance, adopted from Swithenbank et al. (2005). The thermogravimetry analyses are done to find the MSW slow pyrolysis characteristics. The 20 gram sample is placed in the furnace and the experimental variables are three furnace heating rate variations ( 50C/min, 10 0C/min and 20 0C/min) , three sample final temperature ( 300 0C, 400 0C, 500 0C), three holding time variations (15 min, 30 min and 45 min) and five composition variations. 100 ml/min nitrogen is introduced from the bottom of furnace as a swept gas. The produced char then taken for proximate and heating value analysis.
Based on char char proximate and heating value analysis, can be found the optimum pyrolisis experimental conditions which predicted can produce char with optimum characteristics. The experimental conditions are 300 0C final temperature, 5 0C/min heating rate and 15 min holding time. The optimum composition is 75 % organic sample. The proposed experimental procedure have 75.55 % energy yield and give 60,2 % wt char which have 6.626,84 kal/gram heating value, with 2,69 % moisture contents, , 13,31 % ash , 83,87 % volatile matter . If compared with Adaro (Kalimantan coal) , the char heating value relatively higher.
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