Effects of carbonization duration on the characteristics of bio-coal briquettes (coal and cane waste)

摘要

One of the technologies used to utilize low quality coal is by making bio-coal briquettes. Bio-coal briquettes are briquettes made of a mixture of coal and biomass. In this study, bagasse biomass is used as a mixture material of the briquettes. The objective of this study is to disclose the effects of the duration of carbonization on the characteristics of the briquettes. The process of carbonization is conducted to reduce water content and the level of volatile substances and increase the calorific value of the raw materials, so that the resulting briquettes will be of higher quality. This study uses the variations of carbonization duration of 30, 60, 90, 120, and 150 minutes. The result of the study reveals that the best duration of carbonization of raw materials in making bio-coal briquettes is 150 minutes. The bio-coal briquettes made with the duration of carbonization of 150 minutes has moisture content of 10.25%, ash content of 12.91%, volatile substance content of 31.88%, fixed carbon content of 44.96%, calorific value of 5,897 cal / gram, initial ignition time of 6.85 minutes, duration of combustionof 20.26 minutes, CO gas emission of 395 mg / Nm~3, and NO gas emission of 5.6 mg / Nm~3.