Estudo do potencial energético da biomassa (casca e sabugo de milho) para produção e uso de briquetes

Abstract

The potential of corn husks and corn cobs for the production and use of briquettes was investigated in this study. The main objective of the study is to use biomass residues as fuels in the form of carbonized briquettes and to verify their performance in solid fuel combustion equipment. The samples were previously carbonized in a muffle furnace at a temperature of 400°C for 2h and then subjected to grinding and classification. The physical, chemical and thermal characterization of the residues was carried out, and the higher calorific value of the mixture of carbonized corn cobs and cashew nut skin (used as a binder) was determined, obtaining a value of 21.86 MJ/kg, while for the mixture of carbonized shells and cashew nut skin it was 20.66 MJ/kg. 30g of carbonized residue and 30g of binder with particle size smaller than 1mm and moisture content between 7-11% were weighed to produce briquettes at a pressure of 10MPa and temperature of 150oC. The briquettes with 50% cashew nut skin showed lower friability values ​​(2.51-2.56%) and were chosen for further testing. The cob and skin briquette (BSP) showed an energy density of 20.69 MJ/m3 with ICOM of 1.34, while the shell and skin briquette (BCP) had an energy density of 19.81 MJ/m3 and ICOM of 1.26. During the water boiling test, BCP showed lower specific consumption in the cold start phase (78 g/L) compared to BSP (93 g/L); consequently, the BCP presented a slightly higher average thermal efficiency value in the high power phase (37.7%) compared to the BSP (35.9%). During the 3 phases of the boiling test, total PM 2.5 emissions ranging from 2mg to 9152 mg, 4g to 40g of CO 2 emissions and 2.45g to 11.46g of total CO emissions were recorded. (TRADUÇAO NOSSA)