Central theme, technology for all: sharing the knowledge for development. Proceedings of the International Conference of Agricultural Engineering, XXXVII Brazilian Congress of Agricultural Engineering, International Livestock Environment Symposium - ILES VIII, Iguassu Falls City, Brazil, 31st Aug..., 2008
Abstract Traditional logistics of residue removal is expensive and energy demanding, such as the ... more Abstract Traditional logistics of residue removal is expensive and energy demanding, such as the procedures adopted for removing remaining stumps on forest biomass production. When considered as a biomass source, stumps can contribute to minimizing problems related to the restriction of the use of the area in terms of the use of the machines and operational quality, bringing economic and energy benefits or at least, avoiding costs. Therefore, this study aimed at evaluating the operational, economic and energy viability of a mechanized-harvesting system for collection of eucalyptus stumps. So, data related to the work capacity of the equipment were obtained by means of a time and motion of mechanized operations of stumps removal, carrying, processing, and transportation. A model was used to evaluate scenarios and to identify the critical variables. Results showed that the mechanized system used for stumps and roots removal, is operationally and economically viable and provides higher energy performance for this biomass. Total energy input (EI) of the system was 14.3 GJ ha−1, energy intensity 406.8 MJ t−1, EROI was 28.2 for 33 MJ MJ−1 and 4.0 for 4.3 MJ MJ−1 year−1 and a positive energy balance of 434.3 MJ ha−1. The final cost of producing of eucalyptus stump chips was 37.87 USD t−1, savings of USD 2.13 t-1 were obtained for the additional biomass. Restrictions for using this system refer to the minimum area and transportation distance. Additionally, variations in productivity, market price of biomass, and field operational capacity would affect the economic viability of this alternative.
Orange orchards are very important in Brazil, especially in Sao Paulo state where they occupies 6... more Orange orchards are very important in Brazil, especially in Sao Paulo state where they occupies 600,000 ha, approximately. To identify the degree of sustainability of the citrus production system, the energy analysis allows evaluating the efficiency on using inputs directly or indirectly applied. So, this study aimed to evaluate the orange production system under energetic point of view. As result, by the sensitivity analysis was determined that fuel was the main energy demander, followed by pesticides and fertilizer. In the operational work capacity analysis, all combinatios between efficiency (minimum, typical and maximum) and yield levels became positive in year seven, except for the combination minimum efficiency and 10 % less yield, positive in year eight. The best combination (maximum efficiency and 10 % more yield) pays its investment in the edge of year six and seven. From this study is possible to determine the total energy demand for producing oranges and indentify the app...
European Journal of Wood and Wood Products, Feb 12, 2021
Charcoal is a widely used barbecue product that comes into direct and indirect contact with the f... more Charcoal is a widely used barbecue product that comes into direct and indirect contact with the foods ingested. Thus, it must have adequate technical characteristics so that its consumption is not harmful to the environment and human beings. This study aimed to investigate the quality of charcoal for use in domestic barbecue, relating different brands and commercial categories. Products from different brands were collected in two consecutive years, in five different commercial categories: supermarket chain; independent supermarkets; meat market; gas station; and other establishments. The physical, chemical and mechanical properties of charcoal were analyzed. Data were analyzed by uni- and multivariate methods. High variability of product characteristics according to brands, commercial categories and years of collection was detected. In addition, some briquettes marketed as charcoal had characteristics unsuitable for use in barbecue, such as high moisture content (> 9%), high ash content (> 10%) and high friability. Charcoal made available for domestic barbecue has high variability of its technical characteristics for combustion and not all of them were suitable for the use in barbecue.
Central theme, technology for all: sharing the knowledge for development. Proceedings of the International Conference of Agricultural Engineering, XXXVII Brazilian Congress of Agricultural Engineering, International Livestock Environment Symposium - ILES VIII, Iguassu Falls City, Brazil, 31st Aug..., 2008
Abstract Traditional logistics of residue removal is expensive and energy demanding, such as the ... more Abstract Traditional logistics of residue removal is expensive and energy demanding, such as the procedures adopted for removing remaining stumps on forest biomass production. When considered as a biomass source, stumps can contribute to minimizing problems related to the restriction of the use of the area in terms of the use of the machines and operational quality, bringing economic and energy benefits or at least, avoiding costs. Therefore, this study aimed at evaluating the operational, economic and energy viability of a mechanized-harvesting system for collection of eucalyptus stumps. So, data related to the work capacity of the equipment were obtained by means of a time and motion of mechanized operations of stumps removal, carrying, processing, and transportation. A model was used to evaluate scenarios and to identify the critical variables. Results showed that the mechanized system used for stumps and roots removal, is operationally and economically viable and provides higher energy performance for this biomass. Total energy input (EI) of the system was 14.3 GJ ha−1, energy intensity 406.8 MJ t−1, EROI was 28.2 for 33 MJ MJ−1 and 4.0 for 4.3 MJ MJ−1 year−1 and a positive energy balance of 434.3 MJ ha−1. The final cost of producing of eucalyptus stump chips was 37.87 USD t−1, savings of USD 2.13 t-1 were obtained for the additional biomass. Restrictions for using this system refer to the minimum area and transportation distance. Additionally, variations in productivity, market price of biomass, and field operational capacity would affect the economic viability of this alternative.
Orange orchards are very important in Brazil, especially in Sao Paulo state where they occupies 6... more Orange orchards are very important in Brazil, especially in Sao Paulo state where they occupies 600,000 ha, approximately. To identify the degree of sustainability of the citrus production system, the energy analysis allows evaluating the efficiency on using inputs directly or indirectly applied. So, this study aimed to evaluate the orange production system under energetic point of view. As result, by the sensitivity analysis was determined that fuel was the main energy demander, followed by pesticides and fertilizer. In the operational work capacity analysis, all combinatios between efficiency (minimum, typical and maximum) and yield levels became positive in year seven, except for the combination minimum efficiency and 10 % less yield, positive in year eight. The best combination (maximum efficiency and 10 % more yield) pays its investment in the edge of year six and seven. From this study is possible to determine the total energy demand for producing oranges and indentify the app...
European Journal of Wood and Wood Products, Feb 12, 2021
Charcoal is a widely used barbecue product that comes into direct and indirect contact with the f... more Charcoal is a widely used barbecue product that comes into direct and indirect contact with the foods ingested. Thus, it must have adequate technical characteristics so that its consumption is not harmful to the environment and human beings. This study aimed to investigate the quality of charcoal for use in domestic barbecue, relating different brands and commercial categories. Products from different brands were collected in two consecutive years, in five different commercial categories: supermarket chain; independent supermarkets; meat market; gas station; and other establishments. The physical, chemical and mechanical properties of charcoal were analyzed. Data were analyzed by uni- and multivariate methods. High variability of product characteristics according to brands, commercial categories and years of collection was detected. In addition, some briquettes marketed as charcoal had characteristics unsuitable for use in barbecue, such as high moisture content (> 9%), high ash content (> 10%) and high friability. Charcoal made available for domestic barbecue has high variability of its technical characteristics for combustion and not all of them were suitable for the use in barbecue.
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