Banca de DEFESA: DENES DE SOUZA BARROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : DENES DE SOUZA BARROS
DATE: 23/12/2021
TIME: 08:30
LOCAL: Remota
TITLE:

UNDERSTANDING THE EFFECTS OF SEGREGATION OF WASTE WOOD FROM THE BRAZILIAN AMAZON ON CHARCOAL QUALITY AND COMBUSTIBILITY

KEY WORDS:

residual biomass, heterogeneity, species grouping, proximate analysis, thermal analysis, spontaneous combustion.

PAGES: 45
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUMMARY:

Although wood wastes from sustainable forest management are a promising alternative for supplying charcoal production in the Brazilian Amazonia, this biomass and derived charcoal present a heterogeneous quality. The segregation of wood proved to be an important alternative to increase the productivity and yield of charcoal in the production unit, as it promotes the homogenization of the raw material inside the kiln. However, this study aims to study the effects of wood waste segregation on the quality, combustibility, and occurrence of spontaneous combustion in charcoal produced in brick kilns in the State of Pará. The study of charcoal quality was based on physical (bulk density and moisture), mechanical (friability), chemical (fixed carbon content, volatile materials, and ash), and energy (higher heating value and energy density) properties. The parameters analyzed in combustion were ignition temperature, burnout temperature, maximum temperature, maximum combustion rate, average combustion rate, and ignition time. The combustion characteristic index, ignition index, and flammability index were the studied indices. The study revealed that the segregation of residual wood culminated in an increase in the charcoal quality produced in brick kilns, especially regarding bulk density, friability, ash content, fixed carbon content, higher heating value, and energy density. Group 1, formed by charcoal from branches of the D. excelsa species, presented the best values for bulk density (0.737 g cm^-3), ash content (1.20%), heating value (28.9 MJ kg^-1), and energy density (21.3 MJ m^-3). On the other hand, conventional carbonization proved to be very variable, resulting in more friable and less resistant charcoal. Two groups of charcoal did not show spontaneous combustion (1 and 4), which demonstrates that segregation can reduce the occurrence of this phenomenon. On the other hand, traditional charcoals showed samples with spontaneous combustion. Groups 1, 2, and 4 had the best ignition temperatures (379.72°C, 365.98°C, and 367.67°C), burnout temperatures (547.23°C, 533.15°C, and 545.15°C), temperatures at which the greatest loss of mass occurs (515.43°C, 494.02°C, and 499.32°C) and ignition times (33.39 min, 31.86 min, and 32, 26 min). Group 5 produced charcoals with low ignition temperature (361.65°C) and low maximum combustion rate (9.54 % min⁻¹). Therefore, the segregation of wood waste promoted positive results in terms of quality, combustibility, and spontaneous combustion of charcoal produced in brick kilns.

BANKING MEMBERS:
Presidente - 1134991 - THIAGO DE PAULA PROTASIO
Externo ao Programa - 388496 - SUEO NUMAZAWA
Externo à Instituição - MARIO VANOLI SCATOLINO
Externo à Instituição - ANANIAS FRANCISCO DIAS JÚNIOR
Externo à Instituição - PAULO FERNANDO TRUGILHO